JPH0729530Y2 - Lock mechanism of push switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention provides a lock mechanism that temporarily holds the pressing position of the operation knob by pressing the operation knob and releases the pressing position by the next pressing operation. The push-lock switch has a lock function of the push-lock switch for preventing a swing phenomenon of a lock pin holding an operation knob.

"Prior Art" Conventionally, as a push-pull switch using a lock pin, there is a switch disclosed in Japanese Utility Model Publication No. 61-157229. The push-lock switch has a structure for locking the operation knob by locking a lock pin provided on a movable body that moves in the same direction as the operation knob with a heart cam formed on the case. The lock pin is elastically held by a wire spring in which a holding portion is inserted in a groove formed in a holding projection of a movable body and which is locked to the movable body. The lock pin can swing in the first groove with the holding portion serving as a support shaft. The lock pin holding portion prevents the lock pin from moving downward due to the movement restricting portion provided on the movable body.

Further, the push-pull switch disclosed in Japanese Utility Model Laid-Open No. 61-157229 mentioned above has the shape of the heart cam 1 shown in FIGS. 7 and 8. That is, when the operation knob is pressed, the lock pin 2 is locked by the heart cam 1.
In order to move the guide groove 1b at the peripheral portion of 1a in the clockwise direction, a stepped portion 1c is formed in the guide groove 1b for regulating the moving direction of the lock pin 2. Lock pin 2 shown in FIG.
This is the position state when the switch is OFF. When the operation knob is pressed, the lock pin 2 moves from the arrow A to the arrow B direction by the side wall of the step portion 1c and the locking portion 1a and the guide groove 1b, and stops at the position of the lock pin 2'which locks the locking portion 1a. Then the switch turns on. When the operating knob is pressed again, the lock pin 2'moves in the direction of arrow C and the switch returns to the position of the lock pin 2 corresponding to the original OFF position. The step portion 1c is formed in order to prevent the lock pin from moving in the direction of arrow D when the operation knob is pressed and moving the guide groove 1b in the peripheral portion of the locking portion 1c in the counterclockwise direction.

[Problems to be Solved by the Invention] When the lock pin of the push-lock lock switch in the above-mentioned conventional technique is subjected to vibration, impact, etc., as shown in FIG. 9, the holding portion 3a of the lock pin 3 is movable. The holding protrusion 4a is detached from the groove 2b and tilted. When the lock pin 3 is tilted, the engaging portion 3b becomes the locking portion 1a of the heart cam 1.
Also, it becomes impossible to operate the switch by coming into contact with the step portion 1c.

Further, when the operation knob is pressed, the lock pin 2 rotates clockwise around the locking portion 1a of the heart cam 1 to move the lock pin 2 into the guide groove 1b so as to lock in the lock region of the heart cam 1. A mountain having a step portion 1c for regulating the direction is formed. For this reason, when the operation knob is pressed, the load applied to the lock pin 2 becomes high, which deteriorates the automatic return failure and the operation feeling.

[Means for Solving the Problems] The present invention includes a heart cam provided on the inner wall of a case, a movable plate having a vertical groove that interlocks with an operation knob and to which a lock pin is attached, and an engaging portion at one end thereof. An approximately U-shaped lock pin that abuts against a heart cam, inserts the other end into a vertical groove of the movable plate, and supports the rear surface of the central part by a support beam portion of the movable plate, and the other end of the lock pin. A push-out lock switch having a wire spring that holds a portion of the movable plate, and a lateral runout that strikes the center part of the lock pin against the inner walls of both ends of the vertical groove of the movable plate and restricts the lateral runout phenomenon of the lock pin. While forming the prevention portion, the tip of the engagement portion of the lock pin is inclined outward with respect to the surface of the heart cam in the rotational movement direction side of the lock pin. Things that should be solved Is.

"Operation" By forming the side shake prevention part to prevent the shake phenomenon of the lock pin arranged on the movable body, it prevents the shake of the lock pin when the push-rocket switch receives vibration or impact, The lock pin can be secured in a normal position. That is, even when the push-lock switch is vibrated or shocked from the outside, the locking pin does not roll laterally, and the locking pin hits the lateral vibration preventing portion and the lateral motion is stopped. Further, the lock pin, by inclining the tip of the engaging portion that abuts the heart cam peripheral portion, with respect to the surface of the heart cam, in the outward direction on the rotational movement direction side of the lock pin,
The direction of movement of the engaging portion of the lock pin when the operation knob is pressed can be tilted and directed toward the normal movement direction. That is, the lock pin is inclined toward the outer side of the rotation movement direction side of the lock pin with respect to the surface of the heart cam with respect to the tip of the engagement portion, so that when the operation knob is pressed, the lock pin pressed against the heart cam is pressed. The engagement portion is always oriented to move around the heart cam in the normal clockwise direction. As a result, when the knob is operated, the push-lock switch is always controlled so that the switch is turned on and off in the order of “lock” → “release” → “lock” → “release”.

[Embodiment] An embodiment of the locking mechanism of the push-lock switch according to the present invention will be described in detail below with reference to FIGS. 1 to 6.

Reference numeral 5 denotes a movable plate provided inside the case 6, and the operation knob 7
By pressing, it goes up and down. The movable plate 5 includes a lock pin 8, a movable contact piece 9, a steel ball (not shown) and a coil spring (not shown). The movable platen 5 has a vertical groove 5a at the center and a horizontal groove 5b orthogonal to the vertical groove 5a. The movable plate 5 is provided with a lock pin 8 in the vertical groove 5a and a wire spring 10 in the horizontal groove 5b. Reference numeral 5c is a holding protrusion having a vertical groove 5d for inserting the holding portion 8a of the lock pin 8, and a wire spring supported by locking protrusions 5j and 5k formed at both ends of the horizontal groove 5b of the movable plate 5. The central part of 10 is pressed and bent. The vertical groove 5d is a groove whose cross-sectional shape is U-shaped or semicircular. 5e is the central portion 8b of the lock pin 8
Is a support beam portion that supports the rear surface portion. 5f is movable plate 5
It is a movable restricting portion formed in the above, and restricts the range in which the lock pin 8 swings in the front direction, and prevents the lock pin 8 from coming off the movable plate 5. 5g is interposed between the support beam portion 5e and the movable restricting portion 5f,
In addition, it is a horizontal shake prevention portion formed on one side surface of the vertical groove 5a, and limits the range in which the lock pin 8 swings in the left and right lateral directions. 5h and 5i are protruding pieces provided under the operation knob 7.
7a is an engaging protrusion that is fitted into the movable plate mounting portion 7a '. The heart cam 6a includes a heart-shaped locking portion 6b formed on the inner wall of the case 6 and a guide groove 6c formed around the locking portion 4b. The locking portion 6b is a portion for receiving the engaging portion 8c of the lock pin 8 and maintaining the ON state when the operation knob 7 is pressed. The guide groove 6c is a groove that guides the engaging portion 8c of the lock pin 8 when it moves around the locking portion 6b when the operation knob 7 is pressed. The guide groove 6c is a stepped portion for preventing the engaging portion 8c of the lock pin 8 from moving clockwise around the engaging portion 6b and in the opposite direction.
It has 6d, 6e, 6f, and 6g. The step portion 6d is a guide wall for guiding the engagement portion 8c of the lock pin 8 to the position of the engagement portion 8c 'of the locking portion 6b when the operation knob 7 is pressed and released. The step portions 6e, 6f, and 6g are engaged by the engaging portion 8c 'when the operation knob 7 is pressed from the switch ON state in which the engaging portion 8c' of the lock pin 8 is engaged by the engaging portion 6b. Stop 6b
It is a guide wall that is regulated to move in a clockwise direction centering around. The operation knob 7 is attached to the case 6 by inserting the protruding piece 7a into the case 6 and engaging the movable board 5 with the movable board attachment portion 7a 'formed on the protruding piece 7a. The lock pin 8 is a substantially U-shaped rod-shaped member, and includes a holding portion 8a that supports the movable platen 5, a central portion 8b, and an engaging portion 8c that abuts against the heart cam 6a. Holding part 8a for locking pin 8
Is inserted into a vertical groove 5d formed in the center of the holding projection 5c, and is pressed into the vertical groove 5d by a wire spring 10. The central portion 8b of the lock pin 8 is a support beam portion from the rear surface portion.
It is supported by 5e, and is supported by the wire spring 10 from the front part.

The lower end of the substantially U-shaped lock pin 8 is an engaging portion 8c that abuts against the heart cam 6a. The engagement portion 8c is a heart cam 6a.
With respect to the right side, that is, the surface of the heart cam 6a is inclined outward in the rotational movement direction side of the lock pin 8. In addition, the inclination direction of the engaging portion 8c of the lock pin 8 is
When the engaging portion 8c rotates the guide groove 6c in the peripheral portion of the locking portion 6b of the heart cam 6a in the clockwise direction when the operation knob 7 is pressed, tilt it to the right with respect to the heart cam 6a. Engagement part
When the guide groove 6c in the peripheral portion of the heart cam 6a is rotated counterclockwise by the 8c, it is tilted to the left with respect to the heart cam 6a.
The wire spring 10 is a spring in which the holding piece 8a of the lock pin 8 is in contact with the vertical groove 5d, and when the holding piece 8a is tilted with respect to the vertical groove 5d, the wire spring 10 retains the original holding piece 8a. It has elasticity to return to the vertical state.

The locking mechanism of the push-button lock switch according to the present invention is
The configuration is as described above, and the operation will be described in detail below.

The lock pin 8 is restricted from moving upward by the holding projection 5c and the vertical groove 5d, and the downward movement is restricted by the wire spring 10,
The movement is restricted by the heart cam 6a, the movement in the backward direction is restricted by the support beam portion 5e, the movement in the forward direction is regulated by the movable restricting portion 5f, and the lateral movement is defined by the lateral shake preventing portion 5g. It is regulated by the vertical groove 5d. Therefore, even when the push-lock switch is subject to vibration or shock from the outside, the lock pin 8 can be always kept in the normal position. For example, when the push-pull switch is subjected to lateral vibration or impact in the lateral direction, the rolling phenomenon of the lock pin 8 is prevented by the stopper portion 5g and the engaging projection 5h.

When the lock pin 8 is assembled to the movable plate 5, it becomes the state shown in FIG. At this time, since the wire spring 10 holds the bent portion of the holding portion 8a, the central portion 8b of the lock pin 8 is not in contact with the shaft supporting beam portion 5e. The lock pin 8 has the tip of the engaging portion 8c inclined with respect to the surface of the heart cam 6a in the outward direction on the rotational movement direction side of the lock pin 8.

When the movable plate 5 equipped with the lock pin 8 is attached to the case 6, the tip of the engaging portion 8c comes into pressure contact with the surface of the groove of the heart cam 6a as shown in FIGS. Support beam
Abut 5e. Since the tip of the engaging portion 8c of the lock pin 8 is in pressure contact with the heart cam 6a, the engaging portion 8c has elasticity to restore the original tilted state. At this time, the tip of the engaging portion 8c is
The engaging portion 8c is inclined outward in the rotational movement direction,
The tip of 8c is directed to move clockwise. Then, by tilting the tip of the engaging portion 8c, the engaging portion
8c can be prevented from moving in the opposite direction.

When the operation knob 7 is pressed from the released state of the switch OFF, as shown in FIG. 5, the tip of the engaging portion 8c of the lock pin 8 is located on the right side of the engaging portion 8c of the lock pin 8, that is, with respect to the surface of the heart cam 6a. Since the lock pin 8 is inclined outward in the direction of rotational movement of the lock pin 8 and has elasticity, it moves in the direction of arrow E of the two-dot chain line and comes into contact with the side wall 6h of the groove of the heart cam 6a. After that, the lock pin 8 is guided to the side wall 6h,
Without colliding with the locking portion 6b, it descends in the direction of arrow F of the chain double-dashed line and falls onto the stepped portion 6d. Switch the operation knob 7 to OF
The lock pin 8 that moves together with the operation knob 7 when the F is pressed from the released state is the locking portion 6b of the heart cam 6a.
Since it does not hit the bumps or steps, the operation feel is good. That is, since the engaging portion 8c of the lock pin 8 is inclined so as to move around the locking portion 6b in a substantially clockwise direction, the engaging portion 8c moves around the locking portion 6b in the direction opposite to the moving direction. It can be prevented from moving. Therefore, the engaging portion 8c of the lock pin 8 does not descend to the left side of the engaging portion 6b of the heart cam 6a, and the push lock switch does not malfunction. When the operation knob 7 is released, the engaging portion 8c of the lock pin 8 is guided to the stepped portion 6d formed obliquely upward to the left, moves in the direction of the two-dot chain line arrow G, and engages. Move to the position of the portion 8c '(shown by the chain double-dashed line). The switch ON state is maintained by engaging the engaging portion 8c 'of the lock pin 8 with the substantially central portion of the engaging portion 6b of the heart cam 6a. When the operation knob 7 is pressed again, the engaging portion 8c 'of the lock pin 8 descends and strikes the step portion 6e, advances along the two-dot chain line arrow H direction along the step portion 6e, and moves to the step portion 6f. To fall. Then, when the operation knob 7 is released, the engaging portion 8c 'of the lock pin 8 rises in the guide groove 6c on the side wall of the stepped portion 6f and the engaging portion 6b in the direction of the double-dashed line arrow I, and the original engagement Joint 8c
It returns to the position of and the switch is turned off.

At this time, the tip of the engaging portion 8c of the lock pin 8 is pressed against the heart cam 6a, and the elasticity of the engaging portion 8c that tries to restore the original tilted state causes the tip of the engaging portion 8c to lock the heart cam 6a. Department
Prevents the problem that 6b gets caught and does not return to the original OFF position.

"Effect of Invention" The present invention has the following unique effects.

(1) According to the present invention, the stopper pin is provided in the vertical groove into which the lock pin is inserted, so that the lock pin can be prevented from rolling laterally and the swing range can be extremely limited. Therefore, even when the lock pin is vibrated or impacted from the outside, the lock pin does not tilt or fall off.

(2) According to the present invention, the tip of the engaging portion of the lock pin is tilted outward with respect to the surface of the heart cam on the rotational movement direction side of the locking pin, so that the engaging portion of the locking pin always moves normally. To move in the direction. As a result, it is possible to prevent the lock pin from moving in the opposite direction on the peripheral portion of the locking portion of the heart cam, and to prevent the push lock switch from malfunctioning.

(3) Further, according to the present invention, when the operation knob is pressed,
Phenomenon in which the lock pin engagement part moves to the left side of the heart cam locking part (the direction of malfunction), the lock pin engagement part does not move to the bottom of the heart cam locking part, and the switch does not turn on. Can be prevented.

(4) In the lock pin of the present invention, the tip of the engaging portion is inclined outward with respect to the surface of the heart cam on the side of the rotational movement direction of the lock pin. As a result, when the movable plate equipped with the lock pin is attached to the case, and the tip of the engaging portion comes into pressure contact with the surface of the heart cam, the engaging portion always inclines toward the outer side of the normal moving direction of the locking pin, The moving direction of can be directed to the normal moving direction.

(5) The tip of the engaging portion of the lock pin assembled to the switch has elasticity to restore the original tilted state. Due to the elasticity, the invention of the present application has a problem that when the operation knob is pushed from the ON state to the OFF state, the tip of the engaging portion of the lock pin is caught in the engaging portion of the heart cam and does not return to the original OFF position. Prevent.

(6) According to the invention of the present application, when the operation knob is pressed, the engagement portion of the lock pin does not hit the stepped portion that restricts the moving direction of the lock pin that is present in the heart cam of the conventional switch at all, and the lock pin smoothly moves. The operation feeling is good because it is lowered and locked, and it has a wire spring that supports the lock pin.

[Brief description of drawings]

1 to 6 are drawings showing an embodiment of the locking mechanism of the push-pull lock switch according to the present invention.
The figure is an enlarged perspective view of the main part with a part of the movable plate cut away, and Fig. 2 is a vertical sectional view showing the entire structure of the push-button switch.
FIG. 3 is an enlarged sectional view of an essential part showing a mounting state of the lock pin,
FIG. 4 is an enlarged plan view of the movable plate, FIG. 5 is an enlarged plan view showing an embodiment of a heart cam in the locking mechanism of the push-lock switch according to the present invention, and FIG.
It is a sectional view taken along the line YY of the drawing. FIG. 7, FIG. 8 and FIG. 9 are drawings showing the structure of a conventional push-pull switch, and FIG. 7 is an enlarged plan view showing a heart cam shape of the conventional push-pull switch, FIG. FIG. 9 is a sectional view taken along the line XX in FIG. 7, and FIG. 9 is an enlarged plan view showing a mounting state of a lock pin on a movable plate of a conventional push-lock switch. 2, 3, and 8 ... Lock pins, 3a and 8a ... Holding portion,
3b and 8c ... Engagement part, 4 and 5 ... Movable plate, 5a ... Vertical groove, 5d ... Vertical groove, 5e ... Shaft support beam part, 5g ... Lateral shake prevention part, 6 ... Case, 6a …… Heart cam, 6b …… Locking part,
7: operating knob, 8b: central part, 10: wire spring.

Claims (1)

[Scope of utility model registration request] 1. A heart cam provided on an inner wall of a case, a movable plate having a vertical groove which is interlocked with an operation knob and to which a lock pin is attached, an engaging portion of one end of which abuts against the heart cam, and the other end of which is attached. A substantially U-shaped lock pin that is inserted into the vertical groove of the movable plate and supports the rear surface of the central portion by the support beam portion of the movable plate; and a wire spring that holds the other end of the lock pin. In the push-pull lock switch having, on the inner walls of both ends of the vertical groove of the movable plate, a lateral vibration preventing portion for hitting the central portion of the locking pin to restrict the lateral vibration phenomenon of the locking pin is formed, and the locking pin is provided. The locking mechanism of the push-lock switch is characterized in that the tip of the engaging portion of the above is inclined outward with respect to the surface of the heart cam on the rotational movement direction side of the lock pin.