JPH0648611B2 - Interlock device for push button switch - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an interlock device for a multi-stage push button switch, which is small in size and has a mechanically simple structure to perform reliable interlock over a wide range. is there.

[Conventional technology]

In the push button switch, an interlock device is required to prevent two push buttons from being pressed simultaneously in order to prevent damage to the device due to simultaneous operation of both push buttons.

As a general-purpose one, Jitsuko Sho 32-551, No. 3
There is one disclosed in Japanese Patent Publication No. 9-28139. This is because the interlocking rod is housed in the switch body so that it can move laterally between the opposing pushbuttons, and when one of the pushbuttons is pushed down, the pushbutton on the other side is moved and locked. It is what you have done.

[Problems to be Solved by the Invention] In this known method, the structure is complicated and the number of parts used is large.
It takes time to assemble. Assembling becomes difficult especially when using a spring or a ball. Also, the interlock range is about half the stroke of the switch. Therefore, it is difficult to arrange multi-stage switch contacts in this range, and it is not suitable as an interlock system for multi-stage switches.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an interlock device for a push button switch, which reduces moving friction of the interlock lever when the push button is pressed and has good operability.

[Means for Solving the Problems]

The present invention has been made to achieve the above-mentioned object. An interlock lever that is provided in the main body so that two facing push buttons can be pressed and that swings in a seesaw shape between the two push buttons in the main body is provided. In a push button switch formed by forming a groove for fitting and inserting and locking the tip of the interlock lever on the inner side surface of the push button, a protrusion serving as a fulcrum is formed at the center of the lower surface of the interlock lever, The support shafts protruding from both sides of the center of the upper part of the lever are inserted into the grooves of the support guides so as to be swingable like a seesaw, and the springs that push up the support shafts of the levers from below are inserted in the support guides. The gist of the present invention is that a mountain-shaped protrusion that supports the protrusion of the interlock lever as a fulcrum is formed on the bottom surface of the interlock lever fitting groove of the main body.

[Work]

When one of the push buttons is pushed down, the fulcrum of the interlock lever fitted to the inner surface of this push button is abutted and supported by the chevron protrusion formed on the inner bottom surface of the interlock lever fitting groove. Therefore, when the push button is pressed, the interlock lever oscillates like a seesaw and the lever fulcrum moves a little along the slope of the chevron protrusion, which causes the opposite side of the lever to be pushed up.
The push button on the opposite side is locked and cannot be pressed.

When the push button is further depressed, the fulcrum of the interlock lever moves further on the inclined surface of the chevron projection. At this time, the lever moves laterally in the direction of the push-down side push button, but this lever is merely subjected to the push-up force by the spring, which further secures the lock of the push-down side push button. By this operation, even if the push-down action of the push button becomes two or three steps, the interlock can be surely performed. When the pressing force of the push button is released, the lever is smoothly returned to the original position by the action of the spring, and the operability is improved.

〔Example〕

 The present invention will be described below based on the illustrated embodiments.

In the figure, reference numeral 1 is a main body of a push button switch, and push button fitting holes 1a, 1a for fitting two push buttons 2, 2 facing each other are bored in the main body 1 so as to face upward. Vertical guide grooves 1b, 1b for guiding the guide balls 3 for two-stage or three-stage operation (for action) are provided on the outer side inner surface above the fitting hole 1a. The guide ball 3 is guided from the guide groove 1b to the inner surface of the push button fitting hole.

The push button 2 has a shape that can be slidably inserted in the push button fitting hole in the vertical direction of the main body 1, and the inside of the push button is projected in the lateral hole 2a so that the guide ball 3 does not project. Two guide balls 3 and 3 are provided so that the spring 4 is sandwiched in the lateral hole 2a, and two springs 4 are sandwiched between the two guide balls 3 to form a pair of guide balls 3.
So that when the push button 2 is inserted into the push button fitting hole of the main body, the guide ball 3 is pressed by the guide groove surface 1b by the spring pressure.
A spring fitting hole 2b is integrally formed at the center of the bottom of the push button,
When the push button is inserted into the main body, the spring 5 is inserted between the spring fitting hole and the bottom surface of the push button fitting hole of the main body so that the push button is always pushed up.
Shall intervene. In this case, the push button 2 is a movable contact piece which is pierced in the horizontal direction in the push button so as not to come off from the main body 1 by the action of the spring 5, and which contacts and separates from the fixed contact pieces T1 and T2 fixed to the main body side. It is supported by S1 and S2.

Two push button fitting holes 1a, 1a facing each other are provided on the top surface of the main body 1.
The groove 10 is formed so as to connect the spaces, and the interlock lever 13 is inserted into the groove 10.

The interlock lever 13 has a seesaw shape having a size and shape to be fitted into the groove 10, and a fulcrum 13a protruding in a triangular shape is provided on the lower surface of the central portion so as to project the tip of the fulcrum 13a. The top surface of a chevron projection 10T formed on the inner bottom surface of the groove 10 for fitting the locking lever or a part of the inclined surface is supported in abutment with both ends 13b and 13c of the interlock lever 13 facing each other. , 2 are fitted into locking holes 2c, 2c formed on the inner side surfaces of the first and second sides. Also, the interlock lever 13
When the support shafts 13d and 13d are horizontally projected on both sides of the center of the upper part and the interlock lever 13 is inserted into the groove 10, the support shafts 13d and 13d are supported by the support guides 11 and 11.
Are fitted in the grooves 11a of the groove 11a and are swingably supported, and the fulcrum 13a projecting at the center of the lower end abuts the chevron protrusion 10T of the groove 10 and the support guide 11
The spring 15 is interposed in the groove 11a, and the elastic force of the spring 15 is applied to the support shaft 13d so that the interlock lever 13 is slightly lifted upward. Therefore, the spring 15 may be weak enough to cancel the self-weight of the interlock lever 13, and a leaf spring can be used in addition to the coil spring as shown in the drawing. Interlock lever 13
The support shaft 13d may be received, or the support shaft 13d may be directly supported by the spring 15.

Next, the operation of this embodiment will be described.

When both push buttons 2 and 2 are in the OFF state as shown in FIGS. 6 to 7A and the right push button 2 is pushed down and the first step operation is performed as shown in FIG. The interlock lever 13 whose tip is inserted into the push button is supported in the groove of the support guide by the support shaft 13d according to the depression, and the lever 13 does not move downward, but on the right side. Both are pushed down, and on the other hand, the left side is pushed up, tilting like a seesaw. Even if an attempt is made to push down the left push button 2 in this state, since the lower part of the interlock lever is supported by the fulcrum 13a and the chevron protrusion 10T, the left push button cannot be pushed down. That is, the left push button 2 is in an interlocked state.

Further, when the push button 2 on the right side is further depressed to perform the second stage operation (second action), the state shown in FIG.
That is, when the interlock lever is pushed further downward than the state shown in FIG. 7B, the fulcrum 13a is pressed against the chevron projection 10T with a stronger force by the lowering of the right push button. As a result, the fulcrum 13a of the lever 13 becomes the chevron projection 10
The inclined surface of T is moved to the side opposite to the push button, that is, to the left side, so that it is contacted and supported at the inclined surface position on the lower left side of the top surface of the chevron protrusion 10T. At this time also, since the fulcrum 13a is supported by the chevron projections, the interlock lever is prevented from swinging, and the left pressure button is locked.

When the pushing force of the right push button is released, the spring 5 of the push button 2 automatically returns. At this time, the support shaft of the interlock lever, the tip of which is fitted to the push button, is also restored by the push-up action of the spring 15 that supports the lower end in the groove 11a of the support guide, and returns to the state of FIG. It is a thing.

It should be noted that when the left push button is pushed down, the above operation is reversed, and similarly, the right push button is also locked in the first stage operation and the second stage operation.

〔The invention's effect〕

The present invention relates to a push button switch provided in a main body so that two opposing push buttons can be pressed, and a groove is formed in the main body and between both push buttons, in which a groove for interlocking a seesaw is fitted. The tips of the interlock levers are fitted and locked to the inner side surfaces of the push buttons, respectively, and a protrusion serving as a fulcrum is formed at the center of the lower surface of the interlock lever, and the protrusion is formed on the inner bottom surface of the groove into which the lever is fitted. Since the protrusion is supported by the chevron projection as a fulcrum, and the interlock lever is provided with a return spring that always pushes up the interlock lever, the fulcrum of the lever receives this when the push button is pressed. Even if it moves and tilts along the inclined surface of the chevron protrusion, the action of this spring makes it easy and surely returns,
Since the interlock can be reliably performed and the interlock range is wide, the switch can be locked even in the one-step operation and the two-step operation, which has advantages such as improved operability and reliability.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view showing an interlock device for a push button switch of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a plan view of the same. FIG. 4 is a bottom view of the same, FIG. 5 is an external view of the interlock lever partially broken, FIG. 6 is an explanatory view of the operation sequence, and FIG. 7 is a part of the interlock lever supported by a spring. FIG. 7 is an explanatory diagram in which FIG. 6 is drawn corresponding to the operation sequence of FIG. 6. 1 is a main body, 2 is a push button, 10 is a groove, 11 is a support guide, 1
1a is a groove, 13 is an interlock lever, and 15 is a spring.

Claims (1)

[Claims] 1. A pair of push buttons facing each other is provided in the main body so as to be able to be pushed, and a groove for inserting an interlocking lever swinging like a seesaw is formed between the two push buttons in the main body. In a push button switch in which the tips of the locking levers are fitted and locked to the inner side surfaces of the push buttons, a protrusion serving as a fulcrum is formed at the center of the lower surface of the interlock lever, and the protrusions are provided on both sides of the upper center of the lever. The support shaft is inserted into the groove of the support guide to support it so that it can swing like a seesaw, and a spring that pushes up the support shaft of the lever from below is interposed in this support guide, with the protrusion of the interlock lever as the fulcrum. An interlock device for a push button switch, characterized in that a chevron projection for supporting is formed on a bottom surface of an interlock lever fitting groove of a main body.