JPH1069838A - Trigger switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items to enhance an assembling property by designing the movable contact of each switch so that a single moving piece with the property of a spring branches off. SOLUTION: When a control lever is pulled in by finger from a free position, a control shaft 4 moves accordingly to the left of the figure, and a brake terminal 8 fitted to the control shaft 4 leaves the braking fixed contact portions of terminals 19, 21 to turn a brake switch off. When the control lever is further pulled in to move the control shaft 4, a first pressing part 4d1 depresses the abutting part 20d1 of the branching portion of a moving piece 20, a switch movable contact 20c1 is pressed into contact with the switch fixed terminal 221 of a terminal 22, the switch is turned on, a brush 10 slides over the resistor of a circuit board, and a dc motor rotates at rotation speed matching the amount by which the control lever has been pushed in. When the control lever is further controlled and the maximum amount by which it is pulled in is reached, the dc motor starts to rotate at full speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger switch suitable for switching between forward / reverse rotation and rotation speed of an electric tool such as an electric drill and an electric driver.

[0002]

2. Description of the Related Art FIG. 29 is a diagram showing a circuit configuration of a main part of a conventional trigger switch used for an electric tool, for example, an electric drill, FIG. 30 is a longitudinal sectional view thereof, and FIG. It is a top view which cuts out and shows a part.

The trigger switch includes a pair of changeover switches 73 and 74 for switching connection of both ends of the DC motor 51 in response to operation of a changeover lever 50 for switching between forward and reverse rotations of the DC motor for driving the drill blade. In a free position where an operation lever (trigger) 53 that is pulled in with a finger to rotate and drive the blade is not operated, a brake switch 54 that short-circuits both ends of the DC motor 51 to apply braking, a DC power supply and a DC motor A first switch 56 that connects the DC motor 51 to the DC motor 51 via a rotation speed control FET 55 and a short-circuit connection between the DC motor 51 and the DC power supply when the pull-in amount of the operation lever 53 becomes maximum. A second switch 57 for rotating at full speed and a diode 58 are provided.

As shown in FIG. 30, a brake switch 54 is used to move a movable contact 61 for brake provided on an operating shaft 60 urged in the direction of arrow C by a return spring 59, and the movable contact 61 to an arrow. A coil spring 62 for urging in the direction of symbol C, and upper and lower fixed brake contacts 63 and 64 disposed on the case side are provided.
In the free position where the finger 3 is not pulled in the direction of the arrow D in FIG. 30 by the finger, the movable contact 61 for brake is pressed against the fixed contacts 63 and 64 for both brakes, and the brake switch 54 is turned on. DC motor 51
Has been braked.

[0005] The first switch 56 includes a fixed contact 65 disposed at an upper portion in the case, and a movable contact 67 urged by a coil spring 66 so as to press the fixed contact 65.
In the free position, the free end side of the movable piece 68 rides on the convex portion 60b on the upper part of the plunger portion 60a of the operating shaft 60, and the two contact points 65, 67 are connected. The first switch 56 is off.

The second switch 57 has a fixed contact 69 arranged at the lower part of the case, and a movable piece 72 having a movable contact 71 urged by a coil spring 70 so as to press against the fixed contact 69. In the free position, the free end side of the movable piece 72 rides on the convex portion 60c below the plunger portion 60a of the operating shaft 60, and the two contacts 69 and 71 are separated from each other.
7 is off.

The first and second changeover switches 73 and 74, which switch the connection of both ends of the DC motor 51 in response to the switching operation of the switching lever 50, are connected to the DC motor 5.
1 fixed contacts 75 and 76 respectively connected to one end of
Switching contacts 77 and 78 that are switched by the operation of the switching lever 50; fixed contacts 79 and 80 connected to the positive electrode side of the DC power supply;
7 and fixed contacts 81 and 82 connected to the negative electrode side of the DC power supply via the FET 55, respectively.

A switching lever 50 as an operation unit is rotatable about a pivot fulcrum 83 in response to a switching operation.
As shown in FIG. 0 and FIG. 31, a projection 84a of a switching cam 84 as a switching portion provided with switching contacts 77, 78 of the first and second switching switches 73, 74 is engaged, and the switching lever According to the switching operation of 3,
The switching cam 84 is configured to rotate about a fulcrum 85 different from the rotation fulcrum 83 of the switching lever 50 via the protrusion 84a. This switching cam 84
31, fixed contacts 75, 76, 79 of the first and second changeover switches 73, 74, as shown in FIG.
To 82 are arranged. In FIG. 31, 9
Reference numeral 0 denotes a heat sink, and 91 denotes a screw.

FIG. 32 is a view showing a connection state between each of the switching contacts 77 and 78 of the switching cam 84 and each of the fixed contacts 75, 76 and 79 to 82. FIG. 32A shows a neutral state, and FIG. B) shows a forward rotation state, and FIG. 4C shows a reverse rotation state.

When the switching lever 50 is at the neutral position, the switching contacts 77 and 78 of the switching cam 84 are in contact with only the fixed contacts 75 and 76 connected to one end of the DC motor 51, respectively. When the switching lever 50 is switched from the neutral position to select the normal rotation state, the switching cam 84 rotates, and the fixed contact 75 and the fixed contact 79 (80) are connected via the switching contact 77. , The fixed contact 76 and the fixed contact 81 (82) are connected via the switching contact 78, and a normal rotation state is established. When the switching lever 50 is switched in the reverse direction to select the reverse rotation state, the switching cam 8 is switched.
4 rotates, and the fixed contact 75 and the fixed contact 81 (82) are connected via the switching contact 77, while the fixed contact 76 and the fixed contact 79 (80) are connected via the switching contact 78. That is, the state is reversed.

Next, the operation of the conventional trigger switch will be described.

Now, for example, the forward rotation state is selected by the changeover lever 50, and the changeover switch is set in FIG.
It is assumed that the state shown in FIG.

First, in the free position in which the operating lever 53 is not operated by pulling in with a finger, as described above, the brake switch 54 is on, while the first and second switches 56 and 57 are off. .

Next, when the operating lever 53 is pulled in from the free position, the movable contact 61 for the brake of the operating shaft 60 linked to the operating lever 53 is moved from the fixed contacts 63 and 64 for the brake after a stroke corresponding to the play. Then, the brake switch 54 is turned off. Next, the free end side of the movable piece 68 of the first switch 56 rides over the convex portion 60b of the upper portion of the plunger portion 60a of the operation shaft 60, and FIG.
As shown in the figure, the movable contact 67 rotates and the fixed contact 6
5, the first switch 56 is turned on, and the DC motor 5
1 is supplied with power and starts normal rotation. The brush 88 provided on the plunger portion 60a of the operation shaft 60 slides on the resistor of the circuit board (not shown) according to the retracted amount of the operation lever 53, and the current corresponding to the sliding position rotates. The DC motor 51 is supplied via the speed control FET 55 to the DC motor 51, and the DC motor 51 rotates at a rotation speed corresponding to the amount of pull-in of the operation lever 53.

Further, when the retracted amount of the operation lever 53 reaches a predetermined amount, the free end of the movable piece 72 of the second switch 57 is moved to the convex portion 60 below the plunger portion 60a of the operation shaft 60.
When the movable contact 71 rotates and contacts the fixed contact 69, the second switch 57 is turned on, the DC motor 51 and the DC power supply are short-circuited, and the DC motor 51 rotates at full speed.

On the other hand, when the retraction of the operation lever 53 is released, the operation shaft 60 is moved in the direction of arrow C by the return spring 59, and the operation is the reverse of the operation at the time of retraction, and after the second switch 57 is turned off, The first switch 56 is turned off to cut off the power supply, and the brake switch 54 is turned on to short-circuit both ends of the DC motor 51 so that the DC motor 5
1 is to be braked.

When the reverse rotation state is selected by the switching lever 50 for switching between the forward and reverse rotations, the DC motor 51 reversely rotates in the same manner as described above.

[0018]

However, in such a conventional trigger switch, as shown in FIG.
Two movable pieces 68, 72, two coil springs 66, 70 for urging the movable pieces 68, 72, and each movable piece 68, 72
And a terminal plate 89 for connecting and supporting the components, the number of parts is large, and therefore, there is a problem that the assembling property is inferior and the cost is high.

The present invention has been made in view of the above points, and reduces the number of parts constituting the first and second switches, which are main switch sections, thereby facilitating assembly and reducing cost. The purpose is to aim.

[0020]

In order to achieve the above-mentioned object, the present invention is configured as follows.

That is, the trigger switch of the present invention comprises:
A first switch that connects a power supply and a motor via a control element in response to an operation of an operation lever, and a first switch that connects the power supply and the motor without via the control element in response to an operation of the operation lever. In the trigger switch including the two switches, each movable contact of the first and second switches is configured by branching a single movable piece having a spring property, and by an operation member interlocked with the operation lever,
Each of the movable contacts is brought into contact with each of the corresponding fixed contacts.

The movable piece has movable contacts of the first and second switches at first and second branch portions branched into two, respectively, and the operating member includes the first and second switches. By pressing the branch portion against the spring force of the movable piece, the first and second pressing portions each contact the movable contact with the fixed contact, respectively, and each pressing portion is Each movable contact may be brought into contact with each fixed contact at a different operation position of the operation lever.

Also, when the operating lever is operated to a first operating position, the first pressing portion starts contact of the movable contact of the first branching portion with a corresponding fixed contact, and When the lever reaches a second operation position further operated than the first operation position, the second operation position
The movable contact of the second branch may be brought into contact with a corresponding fixed contact by the pressing portion.

Further, a brake switch for short-circuiting both ends of the motor to apply braking is provided, and a movable contact for braking of the brake switch is constituted by a single spring member incorporated in the operation member, and the operation lever is connected to the operation lever. In the initial position where the operation is not performed, the spring member is pressed against the corresponding brake fixed contact against the spring force by the urging means for urging the operation lever in the opposite direction to the operation direction. You may do so.

The operating member may be configured to forcibly separate the welded contact when the contact of the first switch or the second switch is welded and when the operating member returns. You may make it have a part.

The movable piece has respective movable contacts of the first and second switches at first and second branch portions branched into two, respectively, and the operating member includes the first and second switches. The first and second holding portions for separating the movable contacts from the fixed contacts by holding the second branch portion against the spring force of the movable piece, respectively, Alternatively, the movable lever may be released from holding at different operation positions of the operation lever so that each movable contact comes into contact with each fixed contact.

Further, when the operating lever is operated to the first operating position, the holding by the first holding portion is released, and the movable contact of the first branching portion contacts the corresponding fixed contact. The operation is started, and when the operation lever reaches a second operation position further operated than the first operation position, the holding by the second holding unit is released and the second operation position is released.
The movable contact of the branch portion may contact a corresponding fixed contact.

Further, the operating member includes the first and second operating members.
It is good also as a structure which has the 1st and 2nd press contact part which respectively applies a contact pressure to each movable contact which contacted each fixed contact by pressing a branch part.

Further, a brake switch for short-circuiting both ends of the motor to apply braking is provided, and a movable contact for braking of the brake switch is constituted by a single terminal member incorporated in the operating member, and the operating lever is connected to the operating lever. The terminal member is urged toward the fixed contact for braking by an urging means that urges the operation member to return in a direction opposite to the operation direction, and the terminal member is in the returning posture in an initial position where the operation lever is not operated. During the period from the return position to the operation position in accordance with the operation of the operation lever and being separated from the brake fixed contact in accordance with the operation of the operation lever, the period from the return position to the operation position is the brake The contact state with the fixed contact may be maintained.

A switching lever for rotating the motor forward or backward by switching the connection between each terminal on the power supply side and each terminal on the motor side is provided, and the switching lever is rotated according to the switching operation. Along with
It has two first and second switching contacts urged in directions away from each other, and each terminal on the motor side (or each terminal on the power supply side) has the first and second switching contacts, It has first and second fixed contact portions that respectively come into contact with and separate from each other by rotating according to the switching operation, and the terminal on one end side of the power supply (or the motor) is connected to the second terminal according to the switching operation. A first fixed contact portion that contacts and separates from the first fixed contact portion via one switching contact; and a terminal on the other end side of the power supply (or the motor) is configured to perform the second switching in response to the switching operation. A second fixed contact portion that contacts and separates from the second fixed contact portion via a contact, and the first fixed contact portion or the second switching contact that contacts and separates the first switching contact In one of the fixed contact portions of the second fixed contact portion, It may be configured to have the convex portion which is protruded to resist the biasing force of the switching contact of the switching lever.

Further, the first fixed contact portion or the second fixed contact portion, on which the convex portion is not formed, is in a neutral position where neither forward rotation or reverse rotation is selected, and the two switching contacts of the switching lever It may be arranged so as to be separated from.

According to the trigger switch of the present invention, each movable contact of the first and second switches is formed by branching a single movable piece having a spring property. And two coil springs for urging each movable piece,
A portion composed of five parts, that is, a terminal plate for connecting and supporting each movable piece, can be composed only of a single movable piece, thereby reducing the number of parts and improving the assemblability. As a result, costs can be significantly reduced.

The operating member comprises a first and a second branch,
By holding each against the spring force of the movable piece,
The movable contacts are separated from the fixed contacts, respectively, and the movable levers are released at different operation positions of the operation lever to contact the movable contacts with the fixed contacts, so that the first and second branch portions are pressed. As a result, the pushing amount of the operation lever can be reduced as compared with the configuration in which each movable contact comes into contact with each fixed contact.

Further, according to the trigger switch of the present invention, the movable contact for brake is connected to a single spring member or
Since the operation lever is constituted by a single terminal member urged by the urging means for urging the operation lever, the conventional structure is constituted by two parts: a movable contact and a coil spring for urging the movable contact. Compared with the example, the number of parts can be reduced and the assemblability can be improved, thereby further reducing the cost.

Further, according to the trigger switch of the present invention, since the operating member has the opening portion, when the contact portion of the first switch or the second switch is welded, the operating member is required to return to its original position. Then, the welded contact portion can be forcibly opened.

Further, according to the trigger switch of the present invention, the first fixed contact portion or the second fixed contact portion with which the first switching contact of the switching lever for switching between forward rotation and reverse rotation contacts and separates.
Any one of the fixed contact portions of the second fixed contact portion with which the switching contact comes into contact with / separates from the second fixed contact portion has a convex portion formed to protrude against the urging force of the switching contact, so that the switching lever is turned. When moving, the switching contact gets over the convex portion, so that a sufficient click feeling can be obtained.

Further, the first fixed contact portion or the second fixed contact portion, on which the convex portion is not formed, is arranged so as to be separated from the two switching contacts of the switching lever at the neutral position. Even if the operation lever is operated, no current flows to the motor.

[0038]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a longitudinal sectional view of a trigger switch according to one embodiment of the present invention.
FIG. 2 is a side view showing a state where a heat radiating plate, a cover, and the like in FIG. 1 are removed, FIG. 3 is a plan view showing a part of the heat sink and a cover, and FIG. 4 is an exploded perspective view. FIG. 6 is a perspective view showing an arrangement relationship of terminal portions, and FIG. 6 is a circuit configuration diagram.

This trigger switch is provided, for example, in an electric drill to switch between forward and reverse rotation and control the rotation speed. At the top of the case 1, the trigger switch switches between forward and reverse rotation of a DC motor 2 for driving a drill blade. A switching lever 3 is provided, and an operating shaft 4 is provided below the operating lever 4 as an operating member that is linked to an operating lever (trigger) (not shown) that is pulled in by a finger to rotationally drive the drill blade.

The switching lever 3 has an operating portion protruding outside the case 1 at one end, and two first and second switching contacts 5 ₁ and 5 _{2 at} the other end inside the case 1. Unlike the conventional example of FIG. 30 described above, the operating unit and the switching unit are constituted by a single switching lever 3. The first and second switching contacts 5 ₁ and 5 ₂
Depending on the switching operation of the switching lever 3, which switches the connection between the terminals of the DC motor 2 side and the terminals of the DC power supply side, the first, second switching contact 5 _1, 5 _2, 3 , As shown in FIG. As shown in FIG. 7, the first and second switching contacts 5 ₁ and 5 ₂ and the coil springs 6 ₁ and 6 ₂ for urging the switching contacts 5 ₁ and 5 ₂ away from each other are housed in a storage portion 3 a on the other end side of the switching lever 3. housing is retained and, the switching contact 5 _1, 5 _2, the upper and lower portions thereof, which faces each of the outer housing section 3a, this portion, spaced contact with the fixed contact portion which will be described later.

The first and second switching contacts 5 ₁ and 5 ₂ rotate integrally with the switching lever 3 around the same rotation fulcrum 3 b as the switching lever 3 in response to the switching operation of the switching lever 3. And the first and second switching contacts 5 ₁ , 5 ₂
Is different in distance from the rotation fulcrum 3b, and therefore rotates along a concentric circle around the rotation fulcrum 3b.

The operating shaft 4 that moves integrally with an operating lever (not shown) is urged to return in the direction of arrow A in FIG. 2 by a return spring 7. A brake terminal 8 constituting a contact is provided, and a brush 10 that slides on a resistor of a circuit board 9 according to the operation amount of an operation lever is provided.

As shown in the circuit diagram of FIG. 6, the trigger switch includes a forward / reverse switch 11 for switching the connection between both ends of the DC motor 2 in response to a switching operation of the switching lever 3 and a drill. A first switch 13 that connects the DC power supply and the DC motor 2 via the FET 12 as a control element in accordance with the movement of the operation shaft 4 that is interlocked with the operation lever that is pulled in with a finger to rotationally drive the blade; A second switch 14 for short-circuiting the DC motor 2 and the DC power supply to rotate the DC motor 2 at full speed when the retraction amount of the operation lever is maximized;
In a free position in which the operating lever is not pulled and operated, a brake switch 15 for short-circuiting both ends of the DC motor 2 to apply braking, and a diode 16 are provided.

Each of these switches 11, 13, 14, 15
As shown in the arrangement of terminals in FIG. 5, a first motor terminal 17 connected to one end of the DC motor 2 and another A second motor terminal 18 connected to the end, a first terminal 19 connected to the positive electrode of the DC power supply, a second terminal 20 connected to the negative electrode of the DC power supply, and a rotational speed control FET 12
A third terminal 21 connected to the drain of the third terminal 21 and connected to the second terminal 19 via the second switch 14;
A fourth terminal 22 connected to the source of the FET 12 and connected to the second terminal 20 via the first switch 13 and the above-described brake terminal 8 constituting a movable contact of the brake switch 15 are incorporated. I have.

The first and second motor terminals 17 and 18 are connected to the first and second switching contacts 5 ₁ and 2 provided on the switching lever 3 in accordance with the switching operation of the switching lever 3.
5 _2, first contacting spaced respectively, second fixed contact unit 1
71 ₁ , 18 ₁ , 17 ₂ , and 18 ₂ respectively. These first and second fixed contact portions 17 ₁ , 18 ₁ , 17 ₂ , 18
_2, while being formed by bending downward, a first fixed contact portion 17 ₁ of the first motor terminal 17 the second motor terminal 18
The second fixed contact portion 18 _2, together with the opposing, second fixed contact portion 17 ₂ of the first motor terminal 17 and the first fixed contact portion 18 ₁ of the second motor terminal 18 is disposed so as to face the further , Adjacent first and second fixed contact portions 17 ₁ , 1
8 _1; 17 _2, 18 ₂ and are arranged at predetermined intervals.

First terminal 1 connected to the positive side of the DC power supply
Reference numeral 9 denotes two second fixed contact portions 1 corresponding to the second fixed contact portions 17 ₂ and 18 ₂ of the motor terminals 17 and 18 on the upper end side.
9 ₂ , 19 ₂ and these two second fixed contact portions 1
Grooves 23 are formed between 9 ₂ and 19 ₂ at predetermined intervals corresponding to the arrangement of the second fixed contact portions 17 ₂ and 18 ₂ of the motor terminals 17 and 18. Second fixed contact portions 19 _2, 19 ₂ of the first terminal 19, in response to the switching operation of the switching lever 3, second switching contact 5 ₂ via a first motor terminal 17 or the second of the switching lever 3 The second fixed contact portions 17 ₂ and 18 ₂ of the motor terminal 18 are separated from and contact with each other. The first terminal 19 is connected to the brake terminal 8 mounted on the operation shaft 4.
There have fixed contact portions 19 ₁ for toward and away from the brake.
Further, the first terminal 19 has a mounting hole 19a into which the mounting projection 9a formed on the side surface of the circuit board 9 when the circuit board 9 shown in FIG. I have.

The FET 12, the first and second switches 13, 1
Third terminal 21 connected to the negative side of the DC power supply via
Are two first fixed contact portions 21 ₁ , 21 ₁ , 18 ₁ corresponding to the first fixed contact portions 17 ₁ , 18 ₁ of the motor terminals 17, 18 on the upper end side.
21 ₁ and these two first fixed contact portions 21 ₁ , 21
₁ , grooves 24 are formed at predetermined intervals corresponding to the positions of the first fixed contact portions 17 ₁ and 18 ₁ of the motor terminals 17 and 18. The first terminal 21 of the third terminal 21 disposed below the first fixed contact portion 17 ₁ , 18 ₁ of each motor terminal 17, 18.
The fixed contact portions 21 ₁ and 21 ₁ are arranged to face the second fixed contact portions 19 ₂ and 19 ₂ of the first terminal 19.
Spaced first switching contact 5 first fixed contact portion 17 ₁ of ₁ through the first motor terminal 17 or the second motor terminal 18, 18 ₁ to contact. The third terminal 21 has a portion that is bent and extends in parallel with the first terminal 19, and the brake terminal 8 provided on the operation shaft 4 comes into contact with and separates from the parallel portion. has a fixed contact portion 21 _2, and further, the upper portion extending from the lower end of the parallel portion of the horizontal, second second switch fixed contact 21 ₃ constituting the switch 14 described above are formed .

The switching lever 3 is operated to switch to one side or the other side as shown by an arrow B in FIG. 3 according to the forward rotation or the reverse rotation. As shown in FIG. 8, the second switching contacts 5 ₁ and 5 ₂ include first and second motor terminals 17 and 18 disposed above and first and third terminals 19 disposed below. , 21 and the first and second fixed contact portions 17 ₁ , 1 of the first and second motor terminals 17, 18.
8 ₁ , 17 ₂ , 18 ₂ and the first and second fixed contact portions 21 ₁ , 21 ₁ , 19 ₂ , 19 _{2 of} the third and first terminals 21, 19 are brought into contact with and separated from each other.

First fixed contact portion 17 of first motor terminal 17
₁ and the second and the fixed contact portion 18 ₂ of the second motor terminal 18 is disposed on one side of the operation direction of the switching lever 3, second fixed contact portions of the first motor terminal 17 17 ₂ and the second motor terminal 18 the first and the stationary contact portion 18 ₁ of, are arranged on the other side of the operating direction of the switching lever 3. That is, the first and second
First and second fixing contact portions 1 of motor terminals 17 and 18
7 ₁ , 17 ₂ , 18 ₁ , and 18 ₂ are arranged in a zigzag manner as if they were struck diagonally.

With this arrangement, the first and second switching contacts 5 ₁ and 5 ₂ that rotate about the same rotation fulcrum 3 b as the switching lever 3 connect the forward / reverse switching connection to the next. It is possible to do so.

That is, FIGS. 9A, 9B, and 9C are plan views of the contact portion showing neutral, forward rotation, and reverse rotation states.

[0053] In the neutral state shown in FIG. (A) is the part first switching contact 5 _1, first, the first fixed contact portion 17 adjacent the second motor terminals 17 and 18 _1, 18 the gap between ₁ together enters, while entering the groove 24 between the third first fixed contact portion 21 adjacent the terminal 21 ₁ of the lower, 21 _1, second switching contact 5 _2, first, second motor terminals 17 and 18 Next to the second
While entering the gap between the fixed contact portions 17 ₂ and 18 ₂ ,
The second fixed contact portion 1 adjacent to the first terminal 19 below the second fixed contact portion 1
In a state of entering into 9 _2, 19 grooves 23 between the _two.

[0054] When in the forward state shown in the same by operating switching the switching lever 3 from the neutral position to one side Figure (B), the second first switching contact 5 _1, whereas placed on the side
The first fixed contact portion 18 ₁ of the motor terminal 18 and the first fixed contact portion 21 ₁ of the third terminal 21 below the first fixed contact portion 18 ₁
Switching contact 5 _2, while the first motor terminal disposed on the side 1
A second fixed contact portion 17 ₂ of 7, the first terminal 19 thereunder
The second will be in contact with a fixed contact portion 19 ₂ of the first
The motor terminal 17 is connected to the positive pole of the DC power supply, and the second motor terminal 18 is connected to the negative pole of the DC power supply via the FET 12 and the first and second switches 13 and 14.

[0055] Further, when the reverse rotation state shown in operation to FIG switched from the neutral state switching lever 3 on the other side of the same figure (A) (C), 5 1 a first switching contact, arranged on the other side 1st fixed contact part 17 _{1 of} 1st motor terminal 17
When in contact with the first fixed contact portion 21 ₁ of the third terminal 21 of the lower, second switching contact 5 _2, the second fixed contact portion 18 ₂ of the second motor terminal 18 disposed on the other side , will be in contact with a ₂ second fixed contact portion 19 of the first terminal 19 of the lower, first motor terminal 17, FET 12 and the first,
The second motor terminal 18 is connected to the positive pole of the DC power supply while being connected to the negative pole of the DC power supply via the second switches 13 and 14.

In the trigger switch of the conventional example shown in FIG. 30, the switching mechanism for switching the forward / reverse rotation of the DC motor includes, as described above, the switching lever 50 as the operating portion and the operation of the switching lever 50. Fulcrum 85 different from the rotation fulcrum 83 of the switching lever 50 in accordance with
Switching cam 84 as a switching section that rotates about
In this embodiment, the operation unit and the switching unit are provided with the switching lever 3.
Since the switching cam 84 is not required, the number of parts can be reduced, the assemblability can be improved, and the cost can be reduced.

Further, the first and second switching contacts 5 ₁ and 5 ₂ of the switching lever 3 are connected to the first and second switching contacts 5 ₁ and 5 ₂ by the coil springs 6 ₁ and 6 ₂ .
Second fixed contacts 17 ₁ , 18 ₁ , 21 ₁ , 21 ₁ ; 17 ₂ , 1
8 _2, 19 _2, 19 ₂ side are biased respectively, in the neutral position, a part of the first switching contact 5 _1, first, a first fixed contact adjacent the second motor terminals 17 and 18 Part 1
7 ₁ , 18 ₁ and into the groove 24 between the first fixed contact portions 21 ₁ , 21 ₁ adjacent to the third terminal 21,
Some of the second switching contact 5 _2, first, second motor terminal 1
The gap between the adjacent second fixed contact portions 17 ₂ , 18 _{2 of} 7, 7 and the second fixed contact portion 19 ₂ , 1 of the first terminal 19 adjacent to each other.
Will be entering into the groove 23 between 9 _2, it is possible to obtain a click feeling at that time. In this manner, the gaps and grooves 23 and 24 between the adjacent first fixed contact portions 17 ₁ , 18 ₁ , 21 ₁ and 21 _{1 and} between the adjacent second fixed contact portions 17 ₂ , 18 ₂ , 19 ₂ and 19 ₂ are formed. , first, because the engaging operation of the second switching contact 5 _1, 5 ₂ enters can be obtained clicking feeling at the neutral position, there is no need such provide separate components in order to obtain a click feeling.

In this embodiment, the first and second fixed contact portions 17 ₁ and 18 ₁ of the first and second motor terminals 17 and 18 are
Although the switching lever 3 is arranged in a zigzag manner on one side and the other side in the operation direction, as another embodiment of the present invention, the first and second motor terminals 17 and 18 and the The first and third terminals 19 and 21 may be reversed. That is, the first terminal 19 and the third terminal 21 on the DC power supply side
And the first and second fixed contact portions are formed, respectively.
They are arranged in a zigzag pattern and the first and second motor terminals 1
7 and 18 are connected to the first and second switching contacts 5 ₁ and 5 _2.
It may be arranged on each side.

Second terminal 2 connected to the negative side of the DC power supply
Numeral 0 is a single movable piece having a spring property. As shown in FIG. 10, the movable piece 20 is formed to extend upward from one end of the substrate portion 20a, and further includes two portions. And is formed so as to face the substrate portion 20a. Two first and second branch portions 20b ₁ and 20b ₂
The movable contact points 20c ₁ and 20c for the first and second switches constituting the first and second switches 13 and 14 are provided at their free ends.
c ₂ are formed on each lower side, also, the first, the second branch portion 20b _1, 20b _2, abutment portion 20d which is bent to abut against the operating shaft 4 to be interlocked with the operation of the operating lever
₁ and 20d ₂ are formed respectively.

The first and second switch movable contacts 20c ₁ and 20c ₂ of the second terminal 20 are the first switch fixed contact 22 ₁ and the third terminal 21 of the fourth terminal 22 constituting the first switch 13. It is disposed within the case 1 so as to face the second switch fixed contact 21 _3, respectively.

The brake terminal 8 is composed of a single leaf spring. As shown in FIG. 11, the brake terminal 8 includes a branched bent portion 8a housed in a housing portion of the operation shaft 4, Curved contact portion 8 which comes into contact with and separates from fixed contact portions 19 ₁ , 21 ₂ for brake of first and third terminals 19, 21.
b. The brake pin 8, according to the movement of the operating shaft 4 to be interlocked with the operating lever, the apart against the brake fixed contact portion 21 ₂ of the brake fixed contact portions 19 ₁ and the third terminal 21 of the first terminal 19 1, a third terminal 19,
21 are connected and disconnected.

In the free position where the operating lever is not retracted, the brake terminal 8 operates the operating shaft 4.
The fixed contact portions 19 ₁ , 21 of the first and third terminals 19, 21 by the biasing force of the return spring 7 for biasing
₂ is pressed against the spring force, and in this state, the brake terminal 8 is in a bent state. When the operating lever is retracted from this free position against the urging force of the return spring 7, the amount corresponding to the amount of bending becomes a play of the operation lever, and after the retracting operation of the play, the brake terminal 8 is pulled. , Each fixing contact 1
It is configured to be separated from 9 ₁ and 21 ₂ .

In the conventional trigger switch shown in FIG. 30, the movable side of the brake switch 54 is composed of two parts: a movable contact 61 for braking and a coil spring 62 for biasing the movable contact 61. On the other hand, in this embodiment, since they are constituted by a single leaf spring, the number of parts can be reduced, and
The assemblability can be improved, and thereby the cost can be reduced.

As shown in FIG. 12, the operating shaft 4 which moves integrally with an operating lever operated by a finger to rotationally drive the electric drill has a plunger portion 4a. The first storage recess 4b in which the brake terminal 8 is stored and the second storage recess 4b in which the brush 10 is stored.
It has a storage recess 4c.

In accordance with the movement of the operation shaft 4, the second terminal 20 is provided on the lower surface side of the plunger portion 4 a of the operation shaft 4.
The first and second branch portions 20b ₁ and 20b ₂ are respectively pressed to move the movable contacts 20c ₁ and 20c ₂ to the first switch fixed contact 22 _{1 of} the fourth terminal 22 and the second switch 20c ₁ of the third terminal 21.
First to sequentially pressed against the fixed contact 21 ₃ switch, and the second has a pressing portion 4d _1, 4d _2. This first,
The second pressing portions 4d ₁ and 4d ₂ turn on the first switch 13 when the operation lever is operated to the first operation position, and further operate when the operation lever is operated to the second operation position which is the maximum operation position. In addition, it is formed at a different position along the moving direction of the operation shaft 4 so that the second switch 14 is turned on.

In the conventional trigger switch shown in FIG. 30, the movable sides of the first and second switches 56 and 57 bias the two movable pieces 68 and 72 and the movable pieces 68 and 72, respectively. In this embodiment, two coil springs 66 and 70 and a terminal plate 89 for supporting the movable pieces 68 and 72 are used. , The number of parts can be greatly reduced, and the assemblability can be improved, whereby the cost can be reduced.

Further, in this embodiment, as shown in FIG. 12, the first and second pressing portions 4d ₁ , 4d
the downward d _2, first, when the contact of the second switch 13, 14 is welded, at the time of return movement of the operating shaft 4, the first plate-shaped for the welded contacts forcibly opened apart, the second Separation part 4e
₁ and 4e ₂ are provided, and the first and second separation portions 4e are provided.
₁ and 4e ₂ are different return positions along the moving direction of the operation shaft 4 when the contacts are welded,
The second branch portions 20b ₁ and 20b ₂ are brought into contact with the first and second switch movable contacts 20c ₁ and 20c _{2 in} the vicinity of the first and second switch movable contacts 20c ₁ and 20c ₂ .
The first and second switch movable contacts 20c ₁ and 20c ₂ of the branch portions 20b ₁ and 20b ₂ are separated from the fixed contacts 22 ₁ and 21 ₃ .

The trigger switch having the above configuration is as follows.
As shown in FIG. 4, each terminal 8, 17,
18,19,20,21,22, after incorporating the like switching lever 3 and the operating shaft 4 is fitted to the circuit board 9, a hole 12a of the heat radiating portion of FET12 the end 21 ₄ of the lower side of the third terminal 21 The cover 25 having an opening 25 a corresponding to the FET 12 is attached, and the insertion hole 26 a of the heat sink 26 is further inserted into the end 21 ₄ of the third terminal 21.
Inserted through the third terminal 21 of end portion 21 ₄ is caulked, FE
The T12 and the radiator plate 26 are tightly fixed and attached integrally. In addition, the cover 25 is engaged with the protrusion 1 a on the outer peripheral surface of the case 1 on the peripheral portion of the cover 25.
At the position above the opening 25a, a pin 25c corresponding to the mounting hole 26b of the heat radiating plate 26 is projected.

As described above, in order to caulk the end 21 ₄ of the third terminal 21 and bring the FET 12 and the heat sink 26 into close contact with each other, the end 21 ₄ of the third terminal 21 is, as shown in FIG.
A protruding insertion portion 21 ₄ a for inserting the hole 12 a of the heat radiation portion of the FET 12 and the insertion hole 26 a of the heat radiation plate 26, and an opposing support portion 21 ₄ for supporting the crimped FET 12 and the like.
b.

[0070] Thus with the end portion 21 ₄ of the third terminal 21, since the mounting by a so-called split caulking, it is possible to reduce the number of parts as compared with the conventional example of attaching the heat radiating plate or the like by a screw, the assembly of Is improved.

Further, as shown in FIG. 13, the third terminal is connected to the other end of the circuit board 9 shown in FIG.
Engaging projection 2 that engages with engaging hole 9b formed in the peripheral portion of
₁₅ are formed. When the circuit board 9 is installed in the case 1, the brush 10 provided on the operation shaft 4 receives a biasing force in a direction opposite to the mounting direction, so that it is difficult to position the circuit board 9. Conventionally, it is necessary to press the circuit board with a jig, which is inferior in assemblability.

In this embodiment, the projections 9 a on the side surfaces of the circuit board 9 are connected to the first terminals 1
9, the circuit board 9 is pressed down against the urging force of the brush 10 so that the engagement hole 9b of the circuit board 9 is moved to the third position as shown in FIG. Engagement protrusion 2 of terminal 21 having a "-" shaped inclined surface
By engaging with ₁₅ , the circuit board 9 is held at a predetermined position.

[0073] In this embodiment, one end 21 ₄ of the third terminal 21 of the case 1, case 1 outside is passed through the insertion hole 26a of the heat radiating plate 26 disposed, FET 12 and the heat radiating plate by a so-called split caulking but in adhesion to 26, or the insertion hole 26a of the heat sink 26 after tighten the casing 1 inside through the gap between the end 21 ₄ of the third terminal 21 will be communicating with the casing 1 externally, Therefore, dust and the like may enter the inside of the case 1 from the gap.

For this reason, in this embodiment, as shown in FIGS. 2 and 4, while communicating with the insertion hole 26 a of the caulked radiator plate 26, First and second isolation walls 28 ₁ and 28 ₂ for forming first and second dustproof chambers 27 ₁ and 27 ₂ are formed, and the first and second isolation walls 28 ₁ and 28 ₂ and the third isolation wall 28 ₁ and 28 ₂ are formed. The terminal 21 separates the two first and first parts separated from other parts in the case 1.
Second dustproof chambers 27 ₁ and 27 ₂ are formed. Therefore, even if dust enters through the gap of the insertion hole 26a of the heat radiating plate 26, the dust stays in the dustproof chambers 27 ₁ and 27 ₂ and affects each switch in the case 1. There is no malfunction due to dust intrusion.

Next, the operation of the trigger switch having the above configuration will be described.

First, in the free position in the normal rotation state, the switching lever 3 is switched to one side as described above, and each switching contact 5 of the switching lever 3 is operated.
_1, 5 ₂ is in the state shown in FIG. 9 (B). In this state, by the switching contact 5 _1, 5 ₂ of the switching lever 3, the first fixed contact portion 18 ₁ and the first fixed contact portion 21 ₁ of the third terminal 21 is connected to the second motor terminal 18 On the other hand, a second fixed contact portion 17 ₂ of the first motor terminal 17 first
A second stationary contact part 19 _{and second} terminal 19 are connected.

When the operating lever is in the free position where the retracting operation is not performed, the operating shaft 4 is in the initial position shown in FIG. 2 by the urging force of the return spring 7 and is incorporated in the plunger portion 4a of the operating shaft 4. Brake terminal 8
However, the terminals 19 and 21 are pressed against the fixed contact portions 19 ₁ and 21 ₂ of the first and third terminals 19 and 21 to connect the terminals 19 and 21 to short-circuit both ends of the DC motor 2. In this free position, the first and second pressing portions 4d ₁ and 4d ₂ of the plunger portion 4a of the operation shaft 4 are connected to the first and second branch portions 20b ₁ and 20b of the movable piece 20 as the second terminal 20. curved _second upper contact portions 20d _1, 20d ₂ not pressed,
First, second switch movable contact 20c _1, 20c _2, the first switch fixed contact 22 ₁ and the third of the fourth terminal 22
Spaced apart from the second fixed contact 21 ₃ switch terminal 21, first, second switches 13 and 14 are turned off. That is, in the free position, the brake switch 15 is on, while the first and second switches 13, 14 are both off.

When the operating lever is pulled in from this free position by a finger, the operating shaft 4 moves to the left (in the direction opposite to the arrow A direction) in FIG. After the stroke operation corresponding to the play, the brake terminals 8 disposed on the operation shaft 4 are connected to the fixed contact portions 19 ₁ , 21 of the first and third terminals 19, 21 as shown in FIG. _The brake switch 15 is turned off at a distance from ₃ . Further, when the operating shaft 4 is further moved by pulling in the operating lever, the first pressing portion 4d ₁ below the plunger portion 4a of the operating shaft 4 is movable as the second terminal 20, as shown in FIG. the contact portion 20d ₁ of the first branch portion 20b ₁ of the strip 20 is pressed downwards, for the first switch movable contact 20c ₁ is first pressed against the switch fixed contact 22 ₁ of the fourth terminal 22, the first The switch 13 is turned on, a current flows from the DC power supply to the DC motor 2 and the drill blade starts rotating forward, and according to the retracted amount of the operation lever,
Brush 10 mounted on plunger portion 4a of operation shaft 4
Slides on the resistor of the circuit board 9 and a current corresponding to the sliding position is supplied to the DC motor 2 via the FET 12 for controlling the rotational speed. The DC motor 2 rotates at the rotation speed.

When the operation lever is further pulled in to reach the maximum retraction amount, the plunger portion 4a of the operation shaft 4 is moved.
The second pressing portion 4d ₂ of downward, the contact portions 20d ₂ of the second branch portion 20b ₂ of the movable piece 20 of the second terminal 20 is pressed downward, the second switch for the movable contact 20c _2, the 3 pressed against the second fixed contact 21 ₃ switch terminal 21, the second switch 14 is turned on, the DC motor 2 will rotate at full speed and DC motor 2 and the DC power source is short-circuited.

On the other hand, when the retracting operation of the operating lever is released, the operating shaft 4 returns to the right in FIG.
second switch movable contact 20c ₂ is the second switch 14 is turned off and separated from the second switch fixed contact 21 ₃ by d ₂ is released second pressing branches 20b ₂ of the movable piece 20, further return moving, the first pressing of the branch portion 20b ₁ of the movable piece 20 by the first pressing portion 4d ₁ is released 1
The switch movable contact 20c ₁ is separated from the first switch fixed contact 22 ₁ , the first switch 13 is turned off, the power supply is cut off, and the brake terminal 8 mounted on the plunger portion 4a of the operating shaft 4 Are the first and third terminals 19, 2
Brake fixed contact portion 19 ₁ of 1, 21 ₂ brake switch 15 in pressure contact with the on and both ends of the DC motor 2 is adapted to take braking is shorted to DC motor 2.

When the contacts of the first and second switches 13 and 14 are welded, the contacts welded by the separation portions 4e ₁ and 4e ₂ of the operation shaft 4 when the operation shaft 4 returns are moved. It will be forcibly separated.

The above operation is the case of forward rotation, but the switching lever 3 for forward / reverse rotation is switched to the other side to move through the neutral position shown in FIG. 9 (A) and shown in FIG. 9 (C). When the reverse rotation state is selected, the switching contacts 5 ₁ and 5 ₂ of the switching lever 3 are used to switch the first motor terminal 17 to the first motor terminal 17.
The fixed contact portion 17 ₁ and the first fixed contact portion 21 _{1 of} the third terminal 21
While bets are connected, a second fixed contact portion 18 ₂ of the second motor terminal 18 and the second fixed contact portion 19 ₂ of the first terminal 19 is connected, by the same operation as in the case of forward rotation of the above, The DC motor 2 rotates in the reverse direction.

(Embodiment 2) In the above embodiment,
In the open state in which the second terminal 20 having the spring property is not pressed by the plunger portion 4a of the operation shaft 4, each of the movable contacts 20c ₁ and 20c ₂ becomes the first switch fixed contact 22 _1.
And although were biased so as to be separated respectively from the second fixed contact 21 ₃ switch, as another embodiment of the present invention, as described below, the second terminal 20 having a spring property, the In the open state, each movable contact 20c
_1, 20c ₂ may be biased to contact the first switch fixed contact 22 ₁ and the fixed contact 21 ₃ for the second switch.

FIG. 17 is a diagram corresponding to FIG. 2 of another embodiment of the present invention, and FIG.
FIG. 19 shows a state in which the first switch 13 is turned on by pulling the operation lever, and FIG.
It is a figure which shows the state which turned on, respectively. In these drawings, the switching lever, the motor terminal, and the like are omitted, and portions corresponding to the above-described embodiment are denoted by the same reference numerals.

The second terminal 20 of this embodiment is similar to that of FIG.
As shown in FIG. 1, the first and second branch portions 20b ₁ and 20b ₂
Each free end is curved downward (substrate portion 20a) as compared with the above-described embodiment, and when disposed in the case 1 in an open state, the urging force causes the first and second switches to be used. The movable contacts 20c ₁ and 20c ₂ are connected to the first fixed switch contact 22 _{1 of} the fourth terminal 22 and the second fixed contact 22 ₁ of the third terminal 21.
And it is configured to contact with the fixed contact 21 ₃ switch.

On the other hand, the operating shaft 4 has a plunger portion 4a as shown in FIG.
Are provided on the lower surface side of the first and second branch portions 20b of the second terminal 20.
A metal holding plate 100 is provided to lift and hold the _first and _second members 20b2 upward against the urging force. In addition,
FIG. 21 shows a state in which a terminal member of a brake terminal 8 described later is attached. This operation shaft 4 is shown in FIG.
The holding plate 100 shown in FIG. 23 is press-fitted into the main body of the resin operation shaft 4 shown in FIG.
The holding plate 100 is provided with the first and second terminals 20 of the second terminal 20.
First and second holding parts 100a ₁ and 100a _{2 for} holding the branching parts 20b ₁ and 20b ₂ , respectively, and a second holding part 100a
Has _{to 2} to face to ensure contact pressure as will be described later and press-contact portion 100b for pressing the second branch portion 20b _2, the press-fitting portion 100c to be press-fitted held in the main body of the operation shaft 4, and 100d .

In the free position shown in FIG. 17, the first and second branch portions 20b ₁ and 20b _{2 of} the second terminal 20 are connected to the holding plate 100 of the operation shaft 4.
And the movable contacts 20c ₁ , 2
0c ₂ is the first switch fixed contact 22 _{1 of} the fourth terminal 22
And third spaced apart from the second switch fixed contact 21 _third terminal 21, in response to the movement of the operating shaft 4, the second terminal 2
0, the holding of the first and second branch portions 20b ₁ and 20b ₂ is released, and the movable contacts 20c ₁ and 20c ₂ are connected to the first terminal 22 of the fourth terminal 22.
The second fixed contact 21 ₃ switches the switch fixed contact 22 ₁ and the third terminal 21 has a first, second holding portions 100a _1, 100a ₂ above for sequentially contact.

The first and second holding parts 100a ₁ , 100a
a _2, upon operation of the operation lever as shown in Figure 18 to the first operating position, the first switch 13 is turned on, further, a second operation is a maximum operating position shown in Figure 19 The first and second holding portions 100 ₁ , 100 2 are formed at different positions along the moving direction of the operation shaft 4 so that the second switch 14 is turned on when the operation is performed to the position.
100 _2, first in the embodiment described above, corresponds to the second pressing portion 4d _1, 4d _2.

As described above, the lifting of the second terminal 20 from the first and second branch portions 20b ₁ and 20b ₂ by the holding plate 100 provided on the plunger portion 4a of the operating shaft 4 is released, and the second terminal 20 is released. The first and the second by the spring force of the terminal 20
The switch movable contacts 20c ₁ and 20c ₂ are connected to the fourth terminal 22.
The first since the contact with the second fixed contact 21 ₃ switches the switch fixed contact 22 ₁ and the third terminal 21 of, as in the embodiment described above, the operating shaft against the spring force of the second terminal 20 4, the movable contact 20 is pressed by the plunger portion 4a.
The c _1, 20c _2, as compared to the structure for pressing the first switch fixed contact 22 ₁ and the fixed contact 21 ₃ for the second switch, will be possible to reduce the pressing amount of the operation shaft 4,
Excessive deformation of the movable piece constituting the second terminal 20 can be prevented.

Also in this embodiment, the second terminal 20
In order to increase the contact pressure of the first and second switch movable contacts 20c ₁ and 20c ₂ to the first and second switch fixed contacts 22 ₁ and 21 ₃ , the lower surface of the plunger portion 4a of the operating shaft 4 is pressed. Part 4h and the above-mentioned press contact part 100b of the holding plate 100
As a result, the first and second branch portions 20b ₁ ,
20b ₂ are pressed. In particular, the second switch 14 for short-circuiting connecting the DC motor 2 and the DC power source, but a large current is to generate heat flow, pressure contact portion for pressing the second switch movable contact 20c ₂ of such second switch 14 Since 100b is made of a metal plate, it has better heat resistance than resin.

Further, in the above embodiment, the brake terminal 8 is constituted by a single leaf spring. However, in this embodiment, the brake terminal 8 is constituted by a terminal member shown in FIG. 24 instead of the leaf spring. The terminal member is provided with an annular mounting portion 8a for inserting and holding the boss portion 4f formed on the operation shaft 4.
And a contact portion 8b which bends and extends from the mounting portion 8a and contacts / separates from the brake fixed contact portions 19 ₁ and 21 ₂ of the first and third terminals 19 and 21. The terminal member is connected to a boss 4f of the main body of the operation shaft 4 shown in FIG. 25, in which the mounting portion 8a is inserted and held. Fixed contact portion 19 for each of the first and third terminals 19 and 21
The contact portion 8b is configured to be pressed against the _first and _second contacts 212. That is, in this embodiment, the urging force of the leaf spring of the above-described embodiment is also used as the urging force of the return spring 7.

In the free position where the operating lever is not retracted, the brake terminal 8 of this embodiment is actuated by the biasing force of the return spring 7 which biases the operating shaft 4.
As shown in FIG. 17, the contact portion 8b has first, third
Fixed contact portions 19 ₁ , 21 ₂ for the brakes of the terminals 19, 21
In this state, the brake terminal 8
The mounting portion 8a is pressed against the boss 4f of the operation shaft 4 in an inclined return posture. When the operating lever is pulled in from this free position against the urging force of the return spring 7, the mounting portion 8a moves from the inclined return position to the position shown in FIG.
As shown in FIG. 5, the operating posture is perpendicular to the boss 4f, and the period from the return posture to the operating posture is a play of the stroke of the operation lever. 8 is configured to be separated from each of the fixing contact portions 19 ₁ and 21 ₂ .

As described above, since the brake terminal 8 is formed of a terminal member instead of a leaf spring, it is possible to sufficiently secure the thickness of the contact portion, and it is possible to sufficiently cope with wear of the contact due to an arc or the like. .

In this embodiment, in order to increase the click feeling of the switching lever 3 for switching between the normal rotation and the reverse rotation,
It is configured as follows.

FIG. 26 is a perspective view showing the arrangement of the first and second motor terminals 17 and 18, the first and third terminals 19 and 21, and the switching lever 3. FIGS. It is a top view of the contact part of each state of a neutral and a normal rotation, and attaches | subjects the same code | symbol to the part corresponding to the above-mentioned embodiment.

[0096] The first in this embodiment, the first switching contact 5 ₁ of the switching lever 3, which contact spacing respectively, the second
First fixed contact portion 17 on the motor side of motor terminals 17 and 18
₁ , 18 ₁ and the two first terminals on the power supply side of the third terminal 21.
Fixed contact portion 21 _1, 21 ₁ has a convex portion which is bent in an arc shape to protrude to the first switching contact 5 ₁ side, when the return to the neutral position, in FIGS. 27 and 28 as shown, the first switching contact 5 ₁ of the switching lever 3, first rides over the convex portion protruding in an arc shape, the second motor terminal 1
The gap between the adjacent first fixed contact portions 17 ₁ , 18 _{1 of} the first and second fixed contact portions 7 ₁ , 18 ₁ and the adjacent first fixed contact portion 21 ₁ , 2 of the third terminal 21
The click feeling by engaging operation that enters the groove 24 between 1 ₁ can be sufficiently obtained.

[0097] Further, the first in this embodiment, the second switching contact 5 _second switching lever 3, which contacts spaced, second
The second fixed contact portions 17 ₂ , 18 ₂ of the motor terminals 17, 18 and the two second fixed contact portions 19 ₂ , 19 _{2 of} the first terminal 19
Each surface is not formed perpendicularly to the operation direction of the operation shaft (the left-right direction in FIG. 27) as in the above-described embodiment, but is formed obliquely and inclined. In the illustrated neutral position, the second switching contact 5 ₂ of the switching lever 3
Are not in contact with the second fixed contact portions 17 ₂ , 18 ₂ of the first and second motor terminals 17, 18 and the two second fixed contact portions 19 ₂ , 19 ₂ of the first terminal 19, and are in the reverse rotation position or in the figure. in the forward position shown in 28, the second switching contact 5 _second switching lever 3, the second first or second motor terminals 17 and 18
And it is configured to contact with the fixed contact portion 17 ₂ (18 ₂₎ and a second stationary contact part 19 of one of the first terminal 19 ₂ (19 _2).

[0098] Thus, in the neutral position, the second switching contact _{5 2,} the first switching lever 3, the second motor terminal 1
Since the second fixed contact portions 17 ₂ and 18 ₂ of the first and second terminals 7 and 18 and the two second fixed contact portions 19 ₂ and 19 _{2 of} the first terminal 19 are separated from each other, the operation lever is forcibly operated in the neutral position. However, no current flows.

As another embodiment of the present invention, the second fixed contact portion 1 of the first and second motor terminals 17 and 18 is provided.
7 _2, 18 ₂ and two second fixed contact portions 19 _2, 19 ₂ of the first terminal 19, to form a convex portion for obtaining a click feeling, first, the first second motor terminals 17 and 18 inclined stationary contact portion 17 _1, 18 ₁ and two first fixed contact portion 21 ₁ of the 21 ₁ of the third terminal 21, the neutral position, obliquely so as to be separated from the first switching contact 5 ₁ of the switching lever 3 And may be arranged.

[0100]

As described above, according to the present invention, each movable contact of the first and second switches is formed by branching a single movable piece having a spring property. And the number of components is reduced and the assemblability is improved as compared with the conventional example which is composed of five parts, namely, two coil springs for urging each movable piece and a terminal plate for connecting and supporting each movable piece. It is possible to greatly reduce the cost, and further, the operating member holds the first and second branch portions against each other against the spring force of the movable piece, so that each of the movable contacts is The movable contacts are separated from the fixed contacts and released at different operating positions of the operating lever, and each movable contact is brought into contact with each fixed contact. Therefore, the first and second branch portions are pressed to fix each movable contact. Compared to the configuration that contacts the contacts, the operation lever It will be possible to reduce the then-inclusive amount.

Further, according to the trigger switch of the present invention, the movable contact for brake is connected to a single spring member or
Since the operation lever is constituted by a single terminal member urged by the urging means for urging the operation lever, the conventional structure is constituted by two parts: a movable contact and a coil spring for urging the movable contact. Compared with the example, the number of parts can be reduced and the assemblability can be improved, thereby further reducing the cost.

Further, according to the trigger switch of the present invention, since the operating member has the separation portion, when the contact portion of the first switch or the second switch is welded, the operating member is required to return when the operating member returns. Then, the welded contact portion can be forcibly opened.

Furthermore, according to the trigger switch of the present invention, the first fixed contact portion or the second fixed contact portion where the first switching contact of the switching lever for switching between forward rotation and reverse rotation contacts and separates.
One of the fixed contact portions of the second fixed contact portion with which the switching contact contacts / separates is formed so as to protrude so as to oppose the urging force of the first and second switching contacts of the switching lever rotating from the neutral position. Since the switching contact pivots over the projection when the switching lever rotates, a sufficient click feeling can be obtained.

Further, the first fixed contact portion or the second fixed contact portion on which the convex portion is not formed is arranged so as to be separated from the two switching contacts of the switching lever at the neutral position, so that the neutral position is maintained. Even if the operating lever is operated, no current flows to the motor.

[Brief description of the drawings]

FIG. 1 is a sectional view of a trigger switch according to an embodiment of the present invention.

FIG. 2 is a side view of a state where a heat sink, a cover, and the like in FIG. 1 are removed.

FIG. 3 is a plan view showing a part of FIG.

FIG. 4 is an exploded perspective view of FIG.

FIG. 5 is a perspective view showing an arrangement of terminal portions in FIG. 1;

FIG. 6 is a circuit configuration diagram of FIG. 1;

FIG. 7 is a perspective view of a switching lever.

FIG. 8 is a perspective view for explaining a switching operation by a switching lever.

FIG. 9 is a diagram showing contact states of neutral, forward rotation and reverse rotation.

FIG. 10 is a perspective view of a movable piece.

FIG. 11 is a perspective view of a brake terminal.

FIG. 12 is a perspective view of an operation shaft.

FIG. 13 is a perspective view of a third terminal.

FIG. 14 is a cross-sectional view showing an attached state of a circuit board.

FIG. 15 is a side view corresponding to FIG. 2 in a state where the operation lever is retracted.

FIG. 16 is a side view corresponding to FIG. 2 in a state where the operation lever is further retracted.

FIG. 17 is a side view corresponding to FIG. 2 of another embodiment of the present invention.

FIG. 18 is a side view corresponding to FIG. 17 in a state where the operation lever is retracted.

FIG. 19 shows a state in which the operation lever is further retracted.
It is a side view corresponding to FIG.

FIG. 20 is a perspective view of a movable piece.

FIG. 21 is a perspective view of an operation shaft.

FIG. 22 is a perspective view of a main body of the operation shaft.

FIG. 23 is a perspective view of a holding plate.

FIG. 24 is a perspective view of a brake terminal.

FIG. 25 is a sectional view of a main body of the operation shaft.

FIG. 26 is a perspective view showing an arrangement state of each terminal and a switching lever.

FIG. 27 is a diagram showing a contact state at a neutral position.

FIG. 28 is a diagram showing a contact state at a normal rotation position.

FIG. 29 is a circuit configuration diagram of a conventional example.

FIG. 30 is a longitudinal sectional view of a conventional example.

FIG. 31 is a plan view of a conventional example in which a part near a switching lever is partially cut away.

FIG. 32 is a view showing an operation state of a conventional switching lever.

FIG. 33 is a longitudinal sectional view corresponding to FIG. 30 in a state where the operation lever is retracted.

[Explanation of symbols]

2 direct current motor 3 switching lever 4 operation shaft 5 _1, 5 ₂ first, second switching contact 9 circuit board 12 FET 13, 14 first, first second switches 17 and 18, the second motor terminal 19 to 22 first To 4th terminal

Continuing on the front page (72) Inventor Toshiyoshi Sasaki 10 Okayama Todocho, Ukyo-ku, Kyoto, Kyoto Prefecture (72) Inventor Tatsu Yonezawa 10 Okayama Todocho, Ukyo-ku, Kyoto, Kyoto O-Muron Co., Ltd. Inside

Claims (12)

[Claims] A first switch for connecting a power supply and a motor via a control element in response to an operation of an operation lever; and a power supply and a motor via the control element in response to an operation of the operation lever. A trigger switch including a second switch connected to the first switch and a second switch connected to the first lever and the second switch, wherein each of the movable contacts of the first and second switches is formed by branching a single movable piece having a spring property, and is interlocked with the operation lever. A trigger switch, wherein each movable contact is brought into contact with a corresponding fixed contact by an operating member. 2. The movable piece according to claim 1, wherein the movable piece is divided into two parts.
The second branch has movable contacts of the first and second switches, respectively, and the operating member presses the first and second branches against the spring force of the movable piece. Thereby, the first and second movable contacts are brought into contact with the fixed contacts, respectively.
The trigger switch according to claim 1, further comprising a second pressing portion, wherein each pressing portion causes each movable contact to contact each fixed contact at a different operation position of the operation lever. 3. When the operation lever is operated to a first operation position, contact of a movable contact of the first branch portion to a corresponding fixed contact by the first pressing portion is started, and When the lever reaches a second operation position further operated than the first operation position, the movable contact of the second branch contacts the corresponding fixed contact by the second pressing portion. The trigger switch according to claim 2. 4. A brake switch for short-circuiting both ends of a motor to apply braking, wherein a movable contact for braking of the brake switch is constituted by a single spring member incorporated in the operating member, and wherein the operating lever is In an initial position where the operation member is not operated, the spring member is actuated by urging means for urging the operation lever to return in a direction opposite to the operation direction.
4. The trigger switch according to claim 1, wherein the trigger switch is pressed against a corresponding brake fixed contact against the spring force. 5. An opening member for forcibly opening the welded contact portion when the operating member returns to the original position when the contact portion of the first switch or the second switch is welded. The trigger switch according to any one of claims 1 to 4, further comprising a portion. 6. The movable piece includes first and second branches.
The second branch has movable contacts of the first and second switches, respectively, and the operating member holds the first and second branches against the spring force of the movable piece. Thereby, while having the 1st, 2nd holding | maintenance part which separates each said movable contact from each said fixed contact, each holding | maintenance releases the holding | maintenance in the different operation position of the said operation lever, and makes each movable contact. The trigger switch according to claim 1, wherein the trigger switch is configured to contact each of the fixed contacts. 7. When the operation lever is operated to a first operation position, the holding by the first holding portion is released, and the movable contact of the first branch portion contacts the corresponding fixed contact. The operation is started, and when the operation lever reaches a second operation position further operated than the first operation position, the holding by the second holding unit is released, and the movable contact of the second branch unit is moved. 7. The trigger switch according to claim 6, wherein said trigger switch contacts a corresponding fixed contact. 8. The operating member includes first and second press contact portions that press the first and second branch portions to apply a contact pressure to each movable contact that has contacted each fixed contact. The trigger switch according to claim 6 or 7, further comprising: 9. A brake switch for short-circuiting both ends of a motor to apply braking, wherein a movable contact for braking of the brake switch is constituted by a single terminal member incorporated in the operation member, and the operation lever is connected to the operation member. The terminal member is urged toward the fixed contact for brake side by an urging means that urges the operation member to return in a direction opposite to the operation direction. While being pressed against the fixed contact for brake, transitioning from the return position to the operation position in accordance with the operation of the operation lever, separating from the fixed contact for brake, and the period from the return position to the operation position,
2. A contact state with a fixed contact for brake is maintained.
The trigger switch according to any one of to 3 or 6 to 8. 10. A switching lever for switching the connection between each terminal on the power supply side and each terminal on the motor side to rotate the motor forward or backward, and the switching lever rotates according to the switching operation. And has two first and second switching contacts urged in directions away from each other, and each terminal on the motor side has the first and second switching contacts,
The first and second fixed contact portions on the motor side contact and separate from each other by rotating in response to the switching operation, respectively. The terminal on one end side of the power supply is connected to the first fixed terminal portion in response to the switching operation. A power-supply-side first fixed contact portion that comes into contact with or separates from the motor-side first fixed contact portion via a switching contact; and a terminal at the other end of the power supply is connected to the second switching contact in response to the switching operation. A power-supply-side second fixed contact portion that contacts and separates from the motor-side second fixed contact portion through the motor-side and power-supply-side first fixed contact portion that contacts and separates the first switching contact or The second switching contact is in contact
10. A fixed contact portion of any of the motor-side and power-supply-side second fixed contact portions that are separated from each other has a convex portion formed so as to protrude against an urging force of the switching contact of the switching lever. The trigger switch according to any one of the above. 11. A switching lever for rotating the motor forward or backward by switching connection between each terminal on a power supply side and each terminal on a motor side, wherein the switching lever rotates according to a switching operation. And two first and second switching contacts urged in directions away from each other. Each of the terminals on the power supply side rotates the first and second switching contacts in response to the switching operation. The first and second fixed contact portions on the power supply side contact and separate from each other by moving, and the terminal on one end side of the motor is connected to the power supply via the first switching contact in response to the switching operation. A motor-side first fixed contact portion that is in contact with and separates from the first side fixed contact portion, and a terminal on the other end side of the motor is connected to the power supply-side first fixed contact via the second switching contact in response to the switching operation. 2 Contact with fixed contact A motor-side second fixed contact portion that touches and separates, and the motor-side and power-side first fixed contact portion or the second switching contact that the first switching contact comes into contact with and separates from the motor;
10. A fixed contact portion of any of the motor-side and power-supply-side second fixed contact portions that are separated from each other has a convex portion formed so as to protrude against an urging force of the switching contact of the switching lever. The trigger switch according to any one of the above. 12. The motor-side and power-supply-side first fixed contact portions or the motor-side and power-supply-side second fixed contact portions, on which the protrusions are not formed, are neutral in which neither forward rotation nor reverse rotation is selected. The switching lever is disposed so as to be separated from the two switching contacts of the switching lever in a position.
The trigger switch according to 0 or 11.