JP3567116B2 - Oscillator switch structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an oscillating body type switch structure.In particular, a simple structure operated by an oscillating body and a bimetal piece that is heated and deformed due to excessive current allows a power supply to be quickly cut off when excessive current flows. And a switch structure that can ensure safety.
[0002]
[Prior art]
A normal power switch has only two operations, ON and OFF, and is completely operated by a human hand. In areas where power supply is unstable, current may sometimes flow excessively. In such a case, if use is continued without knowing, overheating may occur and a fire may occur. Therefore, there is a need for improvements in switch safety. As such improved switch structures, those disclosed in U.S. Pat. No. 4,937,548 and U.S. Pat. No. 5,786,742 are known.
[0003]
[Problems to be solved by the invention]
However, the conventional switch structure has the following disadvantages. First, the switch described in U.S. Pat. No. 4,937,548 is composed of one bimetal piece, a lever for receiving the operation of the bimetal piece , and one cam actuating component and a swing switch structure, and has two contacts. It opens and closes . If the bimetallic piece is thermally deformed by the excessive current , the lever is pressed and moved, and then the cam actuating part is operated with the fulcrum lost, the contacts are opened and the power is cut off. Due to excessive current flow, it is the bimetallic piece that reacts directly, the bimetallic piece being sequentially transmitted to the lever, the lever being transmitted to the cam actuating component and the oscillating switch and indirectly operating. Therefore, opening of the contacts is delayed, it is impossible to immediately react, excessive current will flow in the instant electric equipment, there is the electrical equipment may be damaged.
[0004]
Moreover, it is necessary to connect with another electric wire in order to maintain conduction with the bimetal piece as a conductive structure, which has a drawback that the structure is complicated and difficult to manufacture. Further, since the bimetal piece simultaneously has the function of operating the lever of the swing type switch, there is a possibility of malfunction.
[0005]
On the other hand, the switch structure described in U.S. Pat.No. 5,786,742 has a structure in which the bimetal piece is thermally deformed , thereby pressing and releasing the engagement of the conductive contact to shut off the switch and automatically return. Have. However, due to the complexity of the structure, there is still the possibility that the contacts will contact and the switch will operate directly when the current flows excessively.
[0006]
SUMMARY OF THE INVENTION It is an object of the present invention to provide an oscillator switch structure that has a quick reaction and has a simple structure and can avoid danger when an excessive current flows.
[0007]
[Means for Solving the Problems]
The present invention provides a swing switch cover which is turned around a fulcrum to be turned on and off,
A contact spring piece connected to one end of the swing switch cover and the other end fixed to the bottom of the switch body;
An oscillating body which is connected via a support lever at a position below a fulcrum of the oscillating switch cover and at a position below the head portion to constitute a link mechanism,
A fixed shaft is inserted through an elliptical engagement slit formed in a head portion at one end of the rocking body so as to be slidable along the fixed shaft, and an operating member extension protruding from the other end of the rocking body is provided on the switch body. By supporting with a fixed blocking member,
The link is slid up and down by the operation of the link in a state in which the rocking body is supported by the blocking member under the elastic force of the bending of the contact spring piece in response to the on / off operation of the switch cover, and the on / off position. Let me maintain
Further, an elastic contact piece constituting a contact is provided below the oscillating body head portion relative to the fixed contact.
The oscillator head is configured to depress the elastic contact piece at the ON position of the lowered switch to close the circuit and open the elastic contact piece at the raised OFF position to turn off the circuit,
Further, a bimetal piece that is energized in the closed state of the circuit is provided opposite to an operating member extension protruding from the other end of the rocking body, and the bimetal piece is heated by an excessive load current and deformed due to heat deformation. Pressing and moving the member extension portion to remove it from the supporting position of the blocking member, raising the head at the other end of the rocking body by the link mechanism, opening the contact spring piece, opening the circuit, and disconnecting from the power supply,
Due to the operation of the rocking body, the contact spring piece is pressed to push up the switch cover to the off position by the elastic force thereof, and the rocking body is returned to the off operation position. The extended portion of the operating member protruding from the end is released from the pressed state, and can be returned on the blocking member.
An oscillator switch structure.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a three-dimensional exploded view of an embodiment of the present invention. The switch structure includes a switch cover 10, a switch body 20, a contact spring piece 30, an oscillating body 40, a bimetal piece 50, and an elastic contact piece 60, respectively .
[0009]
The surface of the switch cover 10 has a slightly concave arch shape, and can be turned around the fulcrum 11 at the lower center on both sides to perform a switch operation for swinging the switch cover 10 right and left . Wherein Immediately below side of the fulcrum 11, the triangular piece 12 is formed, further, it is the triangular piece 12 supporting lever holes 13 are formed.
[0010]
The switch body 20 is a hollow casing having one opening portion 21. One blocking member 22 and one fixed shaft 23 are provided at appropriate locations inside the case . The switch cover 10 is incorporated in the opening 21 . Hollow casing on the bottom surface there are several of slits 24, inserting and fixing the first contact terminal 25 respectively the second contact terminal 26. The first contact terminal 25 is connected to the bimetal strip 50 is in electrical communication with the conductive strip 251. One lower contact 252 is fixed to the conductive piece 251.
[0011]
The upper end of the contact spring piece 30 is connected to the left side of the switch cover 10, the lower end is fixed to the switch body 20 bottom (each figure bottom left), by the elastic force of the contact spring 30 to the top left of the switch cover 10 It works to push up .
[0012]
The oscillating body 40 has a substantially rectangular shape and is divided into a left and right oscillating body portion 41 and a right oscillating body portion 42. The oscillating body left portion 41 and the oscillating body right portion 42 each have a head portion 43 at one end and form an engaging slit 431 formed in the head portion and having a vertically long elliptical opening . The fixed shaft 23 at the corresponding position is engaged . One operating member 44 is disposed on the distal end side of the rocking body 40. When assembling, the convex column 442 of the operating member 44 is inserted into the hole 45 of the right half 42 of the rocking body, and the extended portion 441 of the operating member 44 is assembled. From the opening slit 46 rearward . Then, the operating member 44 is incorporated inside the rocking body 40 together with the spring (elastic component) 444 inserted into the spring accommodating hole 443. A plurality of fixing projections 48 are provided on the inner side surface of the oscillating body left portion 41, and are fitted into a plurality of fixing holes 47 provided on the oscillating body right half 42 to form an integrated oscillating body 40.
[0013]
Extension 441 of the actuating member 44 protrudes out from the end side of the oscillating member 40. The operating member 44 can slide in the lateral direction and reciprocate inside the rocking body 40. One side 410 is provided on the side surface of the left half 41 of the rocker , and is connected to the support lever hole 13 at the bottom of the switch cover 10 by one support lever 49, and the rocker 40 is interlocked with the rocking operation of the switch cover 10. The link mechanism can perform a swing operation .
[0014]
The bimetal piece 50 has a U-shape and is arranged along one side surface of the rocking body 40. One leg is fixed to the first contact terminal 25, and the other leg is fixed to the conductive piece 251. One end of the elastic contact piece 60 is fixed to the second contact terminal 26, and one contact hole 61 is provided at the other open end, and the upper contact 62 is fixed to the bottom surface side. The switch operation of the present invention has three cycles of an off state, an on state, and power cutoff due to excessive current, which will be described below.
[0015]
FIG. 2 is a sectional view of the switch according to the embodiment of the present invention in an off state. The off state is also a situation in which the user has operated. When the user pushes the right side of the switch cover 10, the switch cover 10 rotates clockwise about the fulcrum 11, the contact spring piece 30 is extended, and the support lever hole 13 is also rotated clockwise about the fulcrum 11. In the direction (leftward in this embodiment). Accordingly, when the upper end of the support lever 49 connected to the fulcrum lever hole moves in the same direction, and the lower end of the support lever 49 that engages with the hole 410 of the rocking body 40 pulls the rocking body 40 upward , the head portion thereof The elastic contact piece 60 pressed downward by 43 is released, the elastic contact piece 60 moves upward, and the upper contact 62 and the lower contact 252 separate. For this reason, the circuit of the first contact terminal 25 and the second contact terminal 26 is cut off, and the power supply path is cut off.
[0016]
FIG. 3 is a sectional view of the switch according to the embodiment of the present invention in an ON state. When the user presses the left end of the switch cover 10, the contact spring piece 30 is pushed downward and flexed , and the switch cover 10 rotates counterclockwise around the fulcrum 11, and the support lever hole 13 also rotates about the fulcrum 11. moving in an arc in the counterclockwise direction as heart and (moving to the right in this embodiment), since the upper end of the support lever 49 is also moved in the same (lower right) direction, the rocking of the support lever lower end is engaged with the hole 41 body 40 is pushed downward, the lower end of the head portion 43 of the pivot member 40 presses downwardly the resilient contact piece 60 as it. By this operation , the upper contact 62 on the bottom surface of the elastic contact piece 60 and the lower contact 252 of the conductive piece 251 contact. An external current forms an electric circuit flowing from the first contact terminal 25 to the bimetal piece 50, the conductive piece 251, the lower contact 252, the upper contact 62, the elastic contact piece 60, and the second contact terminal 26. Present.
[0017]
4 as the swing member 40 shown in moves up and down along the fixed shaft 23 which engages with the engaging slits 431 of the upper and lower oval, performs oscillating motion.
[0018]
It should be noted that, in the switched off state and the on state as described above, normally or has expired electricity, through which the lower surface is blocking member extension 441 of actuating member 44 on the oscillator 40 terminal 22 in the state of being placed in the upper surface, is that in normal operating conditions.
[0019]
FIG. 4 is a sectional view showing a state in which an excessive current flows through the switch according to the embodiment of the present invention and the power supply is cut off . When the current flows excessively, the bimetal piece 50 is overheated and bends in the direction of the oscillating body 40 , pushing the convex column 442 of the operating member 44 projecting from the hole 45 on the side of the oscillating body 40 , and pressing the blocking member 22. Remove the extension 441 of the actuating member 44 which has been placed on top, whereby the end side of the oscillating body 40 (left end) to the lower head portion 43 which is suspended on the supporting lever contrary to move up, By this operation, the elastic contact piece 60 is released from the lower end of the head portion 43 that has pressed down, the elastic contact piece 60 moves upward by elasticity, the upper contact 62 and the lower contact 252 are separated, and the power is turned off. .
[0020]
At this time, if no external pressure is applied to the switch cover 10, the contact spring piece 30 extends upward by its own resilient force when it is pressed toward the distal end of the rocking body 40 , and the switch cover 10 is lifted. Is pushed up. The switch cover 10 rotates clockwise about the fulcrum 11 and returns to the off position (FIG. 2). Oscillator 40 is lifted above depending on the tilting of the support lever 49 returns to the normal position. When the bimetal piece 50 cools, it recovers to its original shape , and the extended portion 441 of the operating member 44 of the rocking body 40 is released from its pressing, and the resilient force of the spring 444 of the rocking body 40 causes the blocking member of the switch body 20 to move. The slide 22 returns to the position on the upper surface of the switch 22 and is turned off (FIG. 2), that is, the switch can be turned on again.
[0021]
【The invention's effect】
As described above, according to the present invention, the interlocking of the bimetal strip and the swinging member, when a current excessively flows, the resilient contact piece immediately open the contacts, the power supply is cut off. Further, when the normal state is restored from the abnormal voltage rise, the state is automatically restored so that the switch can be turned on again. Since the operation is fast and the structure is simple, no malfunction occurs and the practicability is high.
[Brief description of the drawings]
FIG. 1 is a three-dimensional exploded view of an embodiment of an oscillator switch structure according to the present invention.
FIG. 2 is a cross-sectional view of the oscillator switch structure of FIG. 1 in an off state.
FIG. 3 is a cross-sectional view of the oscillator switch structure of FIG. 1 in an ON state.
FIG. 4 is an explanatory diagram of the operation of the oscillator switch structure of FIG. 1 when the current is excessive.
[Explanation of symbols]
Reference Signs List 10 switch cover 11 fulcrum 12 triangular piece 13 support lever hole 20 switch body 21 opening 22 blocking member 23 fixed shaft 24 groove 25 first contact terminal 251 conductive piece 252 lower contact 26 second contact terminal 30 contact spring piece 40 rocking body 41 Oscillator left portion 410 Hole 42 Oscillator right half 43 Head 431 Engagement slit 44 Operating member 441 Extension 442 Convex column 443 Spring receiving hole 45 Hole 46 open slit 47 Fixing hole 48 Fixing projection 49 Support lever 50 Bimetallic piece 60 Elasticity Contact piece 61 Contact hole 62 Upper contact

Claims (1)

A swing switch cover that turns around a fulcrum to turn on and off,
A contact spring piece connected to one end of the swing switch cover and the other end fixed to the bottom of the switch body;
An oscillating body which is connected via a support lever at a position below the fulcrum of the oscillating switch cover and at a position below the head portion to constitute a link mechanism,
A fixed shaft is inserted through an elliptical engagement slit formed in a head portion at one end of the rocking body so as to be slidable along the fixed shaft, and an operating member extension protruding from the other end of the rocking body is provided on the switch body. By supporting with a fixed blocking member,
The link is slid up and down by the operation of the link in a state where the rocking body is supported by the blocking member under the elastic force due to the bending of the contact spring piece in response to the on / off operation of the switch cover, and the on / off position Let me maintain
Further, an elastic contact piece constituting a contact that opens and closes relative to the fixed contact is provided below the oscillator head.
The oscillator head is configured to depress the elastic contact piece at the ON position of the lowered switch to close the circuit and open the elastic contact piece at the raised OFF position to turn off the circuit,
Further, a bimetal piece that is energized in the closed state of the circuit is provided opposite to an operating member extending portion protruding from the other end of the oscillator, and the bimetal piece is heated by an excessive load current and deformed due to heat generation. By pressing and moving the member extension portion to remove it from the supporting position of the blocking member, the head at the other end of the rocker is raised by the link mechanism, the contact spring piece is opened, the circuit is opened, and the power is cut off from the power supply,
By the operation of the rocking body, the contact spring piece is pressed to push up the switch cover to the off position by the resilience thereof, and the rocking body is returned to the off operating position. The extended portion of the operating member protruding from the end is released from the pressed state and can be returned on the blocking member.
An oscillator switch structure characterized by the above-mentioned.

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