JP6932884B2 - Enable switch - Google Patents

Description

The present invention relates to an enable switch preferably used for a pendant switch of a crane or a hoist, a remote control box for various devices, robots, machine tools, etc., and in particular, an enable switch capable of three-position operation of off-on-off. It is about.

For example, when operating a crane or hoist, the operator generally operates the pendant switch while approaching the load.
The enable switch allows the crane and hoist to operate only when the switch is on, and the crane and hoist stop operating when the switch is turned off in response to abnormal movement of the crane and hoist. It is one of the means of work.

As a conventional enable switch, a push button switch that turns on while pressing and turns off when you release your hand is used, and if you momentarily release your finger or let go of the pendant switch during work, the crane And the hoist had the function of stopping.

However, the operator may push the push button further in response to the abnormal operation of the crane or hoist.
Therefore, a three-position enable switch has been proposed in which the switch stops even if the hand is released, and stops even if the hand is pushed in the opposite direction (see, for example, Patent Document 1).
The function of the switch is defined as the Japanese Industrial Standards (JIS C8201-5-8: 2009 (IEC60947-5-8: 2009)), and the Ministry of Health, Labor and Welfare's "Guidelines for Comprehensive Machine Safety Standards". Is also recommended for use.

The enable switch according to Patent Document 1 is formed by incorporating a push button into a contact stand on which a fixed contact is arranged so that the push button can be pushed from the first position to the third position via the second position which is the enable position. A swing lever that is swingably pivotally attached to the bottom of the push button, supports the movable contact away from the fixed contact side against the contact spring, and descends together with the push button to bring the movable contact into contact with the fixed contact. And, when the push button is pushed beyond the contact closing position (second position), it is provided with a protrusion that comes into contact with the lower part of the swing lever and pushes up the swing lever, and the push button is released (first position). In the position), the swing lever is turned off by supporting the movable contact, and in the state where the push button is pushed in one step (second position), the swing lever is turned on by lowering to the position of the fixed contact, and the push button is pushed in two steps. In the state (third position), the protrusion pushes up the swing lever so that the swing lever can pull the movable contact away from the fixed contact and turn it off.

By the way, since the enable switch according to Patent Document 1 does not have a forced opening mechanism (direct opening operation mechanism (JIS C8201-5-1: 2007 (IEC60947-5: 1: 2003))), it is welded to the contacts. There was a problem that it could not be forcibly released when the problem occurred.

On the other hand, a 3-position enable switch equipped with a forced release mechanism has also been proposed (see, for example, Patent Document 2), but in addition to the fact that the structure is complicated because a leaf spring is used for the contact, in addition to that, the structure is complicated. There was a problem with durability and poor reliability.

Japanese Unexamined Patent Publication No. 2006-244853 Japanese Unexamined Patent Publication No. 2008-12040

In view of the problems of the conventional three-position enable switch, the present invention provides a three-position enable switch having a simple structure, excellent durability, high reliability, and a forced release mechanism. With the goal.

In order to achieve the above object, the enable switch of the present invention is used.
In a 3-position enable switch equipped with a forced release mechanism, the push button is incorporated so that it can be pushed into the 3rd position from the 1st position through the 2nd position, which is the enable position.
When the push button is pushed from the 1st position to the 2nd position, it is in a contact state to make the main circuit electrically conductive. Movable contacts arranged on the built-in movable contact base and
When the push button is pushed from the second position to the third position, one end side abuts on the push button and the swing operation is performed, and the reciprocating movable base with which the other end side abuts is moved in the direction opposite to the pushing direction of the push button. A swing lever that forcibly separates the contact state between the fixed contact and the movable contact of the circuit to make the main circuit electrically non-conducting.
When the push button released from pushing returns from the third position to the first position via the second position, the fixed contact and the movable contact of the main circuit are brought into a non-contact state, and the main circuit is made into an electrically non-conducting state. A spring gripping mechanism consisting of a steel ball and a coil spring that holds the reciprocating movable base in a predetermined position.
It is characterized by being equipped with.

In this case, the swing lever is mounted by supporting the swing shaft of the swing lever with a bearing member and pushing the bearing member into the contact base, so that the swing lever can be pulled out by the claw portion formed on the bearing member. By fixing it in the stopped state, it can be incorporated into the contact stand and attached.

According to the enable switch of the present invention, a three-position enable switch having a simple structure, excellent durability, high reliability, and a forced opening mechanism can be provided by combining rigid parts. Can be done.

Further, the swing lever is mounted so that the swing shaft of the swing lever is pivotally supported by the bearing member and the bearing member is pushed into the contact base, so that the claw portion formed on the bearing member prevents the swing lever from coming off. By fixing it, it can be incorporated into the contact stand and mounted, so that the structure of the enable switch can be simplified and the assembly can be facilitated.

It is an external view which shows one Embodiment of the enable switch of this invention, (a) is a plan view, (b) is a front view, (c) is a bottom view, (d) is a right side view. It is an exploded view of the enable switch. FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1B of the enable switch. It is operation explanatory drawing of the forced opening mechanism of the enable switch. It is explanatory drawing of the assembly structure of the enable switch. It is an operation explanatory view corresponding to the cross-sectional view of AA of FIG. 1B and the cross-sectional view of BB of FIG. 1D when the push button of the enable switch is pushed. FIG. 5 is an operation explanatory view corresponding to a cross-sectional view taken along the line AA of FIG. 1B and a cross-sectional view taken along the line BB of FIG. 1D when the push button of the enable switch is returned. It is an operation explanatory view corresponding to the DD cross-sectional view of FIG. 1D and the CC cross-sectional view of FIG. 1D when the push button of the enable switch is pushed. It is an exploded perspective view which shows an example which incorporates the enable switch into a pendant switch. It is an exploded perspective view which shows another example which incorporates the enable switch into a pendant switch.

Next, an embodiment of the enable switch of the present invention will be described with reference to the drawings.

<Overview of enable switch>
The enable switch 1 shown in FIGS. 1 (a) to 1 (d) is used by being incorporated in a pendant switch equipped on, for example, a crane or a hoist, and includes a contact base 2 and a push button 3. , Off-on-off 3-position operation is possible.

<Explanation of contact stand>
As shown in FIGS. 2 to 4, the contact base 2 has a box-shaped structure, and a push button accommodating portion for slidably accommodating the push button 3 is formed in the center, and the contact base 2 is stretched on both sides at the upper part. A mounting flange is formed, and fixed contacts 65a and 66a are arranged at the lower portion.

<Explanation of fixed contacts>
The fixed contact 65a is for the main circuit, and the fixed contact 66a is for the auxiliary circuit. The terminal screw 68 is used to fix the contact base 2.

<Explanation of push button>
The push button 3 is made of a rigid body component and is slidably inserted in a state of being urged by the push button return springs 33 and 34 arranged on the contact base 2, and the push button 3 is slidably inserted from the first position in a state where the push button 3 is not pressed. It is incorporated in the contact base 2 so that it can be pushed into the third position in which the push button 3 is completely pushed through the second position in which 3 is pushed to the intermediate position which is the enable position.

Then, with the push button 3 incorporated in the contact base 2, the cover body 4 is attached so as to be integrated.
As shown in FIG. 5, the cover body 4 is attached so as to be pushed into the contact base 2, so that the cover body 4 can be fixed in a retaining state by the claw portion 41 formed on the cover body 4.

The push button 3 is formed with a circular first penetrating portion 35, a rectangular second penetrating portion 36, and a rectangular third penetrating portion 37.

<Explanation of push button click mechanism>
The enable switch 1 has a click mechanism that gives a click feeling when the push button 3 is pushed in so that the user can be aware of the positions of the first, second, and third positions of the push button 3. Is equipped.

The click mechanism is composed of a steel ball 31 and a coil spring 32 arranged in a circular first penetrating portion 35 formed in the push button 3, and a step portion 2a formed on the contact base 2 side.
As a result, the steel ball 31 can be pressed against the step portion 2a formed on the contact base 2 side along the reciprocating path of the first, second and third positions of the push button 3 by the urging force of the coil spring 32. It has become.
Then, when the push button 3 is pushed from the first position to the second position, a click feeling is generated when the steel ball 31 tries to get over the step portion 2a, and when the push button 3 is pushed from the second position to the third position. In addition, the steel ball 31 tries to get over the lower step portion 2a, and a click feeling is generated.

<Explanation of reciprocating movable table>
Inside the rectangular second penetrating portion 36 formed in the push button 3, a reciprocating movable base 5 made of a rigid body component is slidably incorporated.

The reciprocating table 5 is provided with a spring gripping mechanism including a steel ball 51 and a coil spring 52 that hold the reciprocating table 5 in a predetermined position.

<Explanation of movable contacts>
A movable contact base 61 having a movable contact 61a corresponding to a fixed contact 65a for the main circuit is incorporated into the reciprocating movable base 5 in a state of being urged by a coil spring 62.

A movable contact base 63 in which a movable contact 63a corresponding to a fixed contact 66a for an auxiliary circuit is arranged is incorporated in a rectangular third penetrating portion 37 formed in the push button 3 in a state of being urged by a coil spring 64. To.

<Explanation of forced separation mechanism>
When the push button 3 is pushed from the second position to the third position below the push button 3 of the contact base 2, one end of the push button 3 is in contact with the push button 3 to perform a swing operation, and the reciprocating movable base 5 with the other end is in contact with the push button 3. By moving the push button 3 in the direction opposite to the pushing direction, the swing lever 7 is arranged to forcibly release the contact state between the fixed contact 65a and the movable contact 61a of the main circuit to make the main circuit electrically non-conducting. Set up.

The swing lever 7 is integrated with the contact base 2 by incorporating and mounting the swing lever 7 in a state where the swing shaft is pivotally supported by the bearing member 71.
As shown in FIG. 5, the bearing member 71 is mounted so as to be pushed into the contact base 2, so that the bearing member 71 can be fixed in a retaining state by the claw portion 71a formed on the bearing member 71.

<Explanation of switching operation>
The switching operation associated with the operation of the push button 3 of the enable switch 1 configured as described above will be described mainly with reference to FIGS. 6 to 8.

<Explanation of operation of main contact>
As shown in FIG. 6 (1), when the push button 3 is in the first position (initial state), the reciprocating movable base 5 stands by in the normal position, and at this time, it is movable with the fixed contact 65a for the main circuit. It is separated from the contact 61a, and the main circuit is electrically in a non-conducting state.
Next, as shown in FIG. 6 (2), when the push button 3 is pushed to the second position which is the enable position, a step where a spring gripping mechanism composed of a steel ball 51 and a coil spring 52 is formed on the push button 3 side. By being locked to the portion 36a, the reciprocating movable base 5 moves in accordance with the push button and is pushed together with the push button 3, and the fixed contact 65a for the main circuit and the movable contact 61a are in contact with each other. It becomes electrically conductive.
Next, as shown in FIG. 6 (3), when the push button 3 is further pushed from the second position to the third position, one end side of the swing lever 7 comes into contact with the push button 3 and the swing lever 7 swings. By moving the reciprocating movable base 5 with which the other end side of the swing lever 7 is in contact in the direction opposite to the pushing direction of the push button 3, the contact state between the fixed contact 65a and the movable contact 61a of the main circuit is forcibly released. As a result, the main circuit is electrically non-conducting.
At this time, the reciprocating movable base 5 is held at a predetermined position of the push button 3 by the spring gripping mechanism composed of the steel ball 51 and the coil spring 52 overcoming the stepped portion 36a formed on the push button 3 side, and the fixed contact of the main circuit. The contact state between the 65a and the movable contact 61a is forcibly separated, and the main circuit is electrically maintained in a non-conducting state.

As shown in FIGS. 7 (4) to 7 (6), when the pushing force of the push button 3 is released, the push button 3 moves from the third position to the first position through the second position due to the action of the push button return springs 33 and 34. It automatically returns to the position.
The reciprocating movable base 5 of (4) of FIG. 7 ((3) of FIG. 6) is held at a predetermined position of the push button 3, and the contact state between the fixed contact 65a and the movable contact 61a of the main circuit is forcibly released to release the main circuit. In the process of returning the push button 3 from the third position to the second position from the state of being electrically maintained in the non-conducting state, the movable contact base 61 interferes with the cover body 4, so that the steel ball 51 and the steel ball 51 and By overcoming the stepped portion 36a formed on the push button 3 side by the spring gripping mechanism composed of the coil spring 52 in the direction opposite to that in the cases (2) to (3) of FIG. During this time, the fixed contact 65a for the main circuit and the movable contact 61a are separated from each other, and the main circuit is electrically maintained in a non-conducting state.

<Explanation of auxiliary contact operation>
As shown in FIG. 8 (1), when the push button 3 is in the first position (initial state), the fixed contact 66a for the auxiliary circuit and the movable contact 63a are separated from each other, and the auxiliary circuit is electrically non-conducting. It is in a state.
Next, as shown in FIG. 8 (2), even if the push button 3 is pushed to the second position which is the enable position, the fixed contact 66a for the auxiliary circuit and the movable contact 63a are similarly separated from each other, and the auxiliary contact 63a is assisted. The circuit is electrically non-conducting.
Next, as shown in FIG. 8 (3), when the push button 3 is further pushed from the second position to the third position, the fixed contact 66a for the auxiliary circuit and the movable contact 63a are in contact with each other, and the auxiliary circuit is brought into contact with each other. Becomes electrically conductive.

When the pushing force of the push button 3 is released, the push button 3 automatically returns to the first position from the third position through the second position by the action of the push button return springs 33 and 34.
As a result, the contact state between the fixed contact 66a and the movable contact 63a of the auxiliary circuit is released, and the auxiliary circuit is kept in an electrically non-conducting state.

<Explanation of action and effect>
According to the enable switch 1 of the present embodiment, the structure is simple and durable by combining the contact base 2 made of rigid parts, the push button 3, the cover body 4, the reciprocating movable base 5, and the swing lever 7. It is possible to provide a three-position enable switch equipped with a forced release mechanism, which is excellent and highly reliable.

Further, by mounting the cover body 4 so as to be pushed into the contact base 2, the claw portion 41 formed on the cover body 4 can be fixed in a retaining state, or the swing lever 7 can be moved to the swing lever 7. The swing shaft of the above is supported by the bearing member 71, and the bearing member 71 is mounted so as to be pushed into the contact base 2, and is fixed in a retaining state by the claw portion 71a formed on the bearing member 71. By incorporating and mounting the enable switch 1 in 2, the structure of the enable switch 1 can be simplified and the assembly can be facilitated.

Since the enable switch 1 is compactly unitized, it can be easily assembled to various types of pendant switches.
For example, as shown in FIGS. 9 and 10, by sharing the mounting structure of the pendant switch 8 with other switches, it is possible to freely layout the pendant switch 8 according to the usability of the operator.

The enable switch of the present invention has been described above based on the embodiment thereof, but the present invention is not limited to the configuration described in the above embodiment, and the configuration is appropriately modified without departing from the spirit of the present invention. Is something that can be done.

The enable switch of the present invention provides a three-position enable switch having a simple structure, excellent durability, high reliability, and a forced release mechanism, and various 3 positions including cranes and robots. It can be suitably used for position enable switch applications.

1 Enable switch 2 Contact stand 2a Stepped part (click mechanism)
3 Push button 31 Steel ball (click mechanism)
32 Spring member 36a Stepped part (spring gripping mechanism)
4 Cover body 41 Claw part 5 Reciprocating movable base 51 Steel ball (spring gripping mechanism)
52 Spring member (spring gripping mechanism)
61 Movable contact base (for main circuit)
61a Movable contact (for main circuit)
63 Movable contact base (for auxiliary circuit)
63a Movable contact (for auxiliary circuit)
65 Fixed contact base metal (for main circuit)
65a Fixed contact (for main circuit)
66 Fixed contact base metal (for auxiliary circuit)
66a Fixed contact (for auxiliary circuit)
7 Swing lever 71 Bearing member 71a Claw 8 Pendant switch

Claims (2)

In a 3-position enable switch equipped with a forced release mechanism, the push button is incorporated so that it can be pushed into the 3rd position from the 1st position through the 2nd position, which is the enable position.
When the push button is pushed from the 1st position to the 2nd position, it is in a contact state to make the main circuit electrically conductive. Movable contacts arranged on the built-in movable contact base and
When the push button is pushed from the second position to the third position, one end side abuts on the push button and the swing operation is performed, and the reciprocating movable base with which the other end side abuts is moved in the direction opposite to the pushing direction of the push button. A swing lever that forcibly separates the contact state between the fixed contact and the movable contact of the circuit to make the main circuit electrically non-conducting.
When the push button released from pushing returns from the third position to the first position via the second position, the fixed contact and the movable contact of the main circuit are brought into a non-contact state, and the main circuit is made into an electrically non-conducting state. A spring gripping mechanism consisting of a steel ball and a coil spring that holds the reciprocating movable base in a predetermined position.
An enable switch characterized by being equipped with. The swing lever is fixed to a retaining state by a claw portion formed on the bearing member by supporting the swing shaft of the swing lever by a bearing member and mounting the bearing member so as to push it into a contact base. The enable switch according to claim 1, wherein the enable switch is incorporated into a contact stand and mounted.

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