JPH0643955Y2 - Push button switch locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a lock device for a push button switch, and more particularly, to pressing the upper and lower parts of a hook pin with upper and lower projections of an elastic plate and using the elastic plate as a base. Vibration by stopping
The present invention relates to a push button switch locking device that is resistant to impact and is easy to assemble.

(Outline of the Invention) The present invention is a push-button switch locking device capable of preventing the locking operation from being defective due to vibration and impact and significantly reducing the number of assembling steps.

The lock device of the push button switch includes a base, a plunger, a U-shaped hook pin extending between the base and the plunger, and an elastic plate that presses the hook pin against the base and the plunger.

A switch opening / closing mechanism is provided on the upper surface of the base, and hook pin support holes are formed on the side surfaces. A plunger is provided so as to be vertically movable with respect to the base. A heart cam is formed on a side surface of the plunger, an upper end hook-shaped portion of the hook pin is movably locked in a cam groove of the heart cam, and a lower end hook-shaped portion is locked in the hook pin support hole. In addition, a guide groove that connects the cam groove of the heart cam and the lower end of the plunger is provided on the side surface of the plunger.

The elastic plate is locked to the base, and integrally forms upper and lower projections for pressing the upper and lower back sides of the hook pin. Side protrusions are provided on both left and right sides of the elastic plate, and vertical grooves for accommodating the side protrusions are provided on the base, and the elastic plate is locked to the base. Further, a protrusion is provided on the base and a hole for engaging with the protrusion is provided on the elastic plate to position the elastic plate.

(Prior Art) Conventionally, various types of heart cam lock mechanisms have been provided. However, as a leaf spring of the heart cam lock mechanism, a cantilever spring is formed inside an elastic plate punched out, and the structure is complicated. It is difficult to reduce the size of the push button switch.

Therefore, in order to facilitate the assembly and reduce the size, a push button switch as shown in FIG. 5 has been developed (see Japanese Utility Model Laid-Open No. 61-184240).

Hereinafter, a conventional push button switch will be described with reference to the drawings.

In the figure, a hook pin support hole 3 is provided slightly above the leaf spring locking portion 2 formed on the side surface of the switch base 1.

On the other hand, a pair of holders 4 are erected on the upper surface of the switch base 1, and a plunger 5 of a switch pressing piece is provided between the holders 4 so as to be vertically movable.

A heart cam 6 is arranged on the side surface of the plunger 5 to form a cam groove 7. Hook pin 8 in the cam groove 7
The upper end hook-shaped portion is movably locked, and the lower end hook-shaped portion is inserted into the hook pin support hole 3.

A leaf spring 9 whose lower end is supported by the leaf spring locking portion 2 is arranged on the back surface of the hook pin 8, and the leaf spring 9 presses the back surface of the hook pin 8.

With the above configuration, the structure of the leaf spring 9 is simplified and the leaf spring 9 and the hook pin 8 can be directly attached to the switch base 1.

Therefore, not only the assembly work can be simplified, but also the switch can be downsized.

(Problems to be Solved by the Invention) However, in the conventional switch locking device as shown in FIG. 5, when the switch is assembled,
First, the plunger 5 is inserted into the holder 4 and the hook pin 8
It is necessary to lock the lower end of the plate spring 9 to the plate spring locking portion 2 provided on the switch base 1 via the. In this case, the plunger 5 must be always pressed against the return coil spring (not shown) to perform the assembling work, which makes the assembling work difficult.

Further, since the back surface of the hook pin 8 is pressed by the leaf spring 9 at one place, the hook pin 8 may be disengaged due to vibration or impact, which may result in locking failure.

(Means for Solving the Problem) Therefore, in order to solve the above-mentioned problems, the push button switch locking device of the present invention has a switch opening / closing mechanism provided on the upper surface and a hook pin supporting hole formed on the side surface, A plunger that moves up and down with respect to the base and has a heart cam on its side surface, and extends between the base and the plunger, and the upper end hook-shaped portion is movably locked in the cam groove of the heart cam and the lower end. A lock device comprising a U-shaped hook pin whose hook-shaped portion is locked in the hook pin supporting hole, and an elastic plate integrally formed with a protruding piece for pressing the back side of the hook pin, wherein a heart cam is provided on the plunger. The guide groove that connects the cam groove and the lower end of the plunger is provided, and the upper and lower projections that press the upper and lower sides of the back side of the hook pin are provided. An elastic plate having a piece is provided, a positioning projection and a vertical groove are provided on the base, the hole of the elastic plate is fitted into the positioning projection of the base, and the side projection of the elastic plate is attached to the base. In the vertical groove, and the elastic plate is locked to the base.

(Operation) According to the present invention, in assembling the switch, first, the lower end hook-shaped portion of the hook pin bent in a U shape is inserted into the hook pin supporting hole provided in the base, and the elastic plate is locked to the base. And press the top and bottom of the back of the hook pin.

Then, when the plunger is lowered in this state, the hook-shaped upper end portion of the hook pin is introduced into the guide groove and inserted into the cam groove of the heart cam.

Further, the side projections provided on both left and right sides of the elastic plate are housed in the vertical groove by utilizing the elasticity thereof.

The positioning projection provided on the base engages with the hole formed in the elastic plate and is used for positioning.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

The same structural parts as those of the conventional push button switch are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 is an exploded perspective view of a lock device for a switch according to the present invention,
FIG. 2 is a sectional view of the switch of the present invention, FIG. 3 is a perspective view of a main part of the switch of the present invention, and FIG. 4 is an exploded perspective view of the switch of the present invention.

In FIG. 4, a switch opening / closing mechanism 11 is provided on the side of the upper surface of the base 1.

The switch opening / closing mechanism 11 has an inverted L shape and one end thereof is fixed to the base 1 by a normally closed fixed contact piece 12, and a normally open fixed contact piece 12 is provided on the base 1 so as to face the normally closed fixed contact piece 12. Fixed armature 13
Have and. Further, a substantially U-shaped rising piece 14 is erected on the base 1 adjacent to both the contact pieces 12 and 13.

The normally closed fixed contact piece 12 and the normally open fixed contact piece 13 pass through the inside of the base 1 and are connected to the contact terminals 15 and 16, respectively. The rising piece 14 also penetrates the inside of the base 1 and is connected to the common terminal 17.

A movable contact piece notch portion 18 is formed in a direction orthogonal to the plate thickness direction of the rising piece 14. One end of the movable contact piece 19 is abutted against the movable contact piece cutout portion 18. At the other end of the movable contact piece 19, there is provided a contact 20 for contacting and separating between the normally closed fixed contact piece 12 and the normally open fixed contact piece 13. Further, the movable contact piece 19 forms an arc shielding portion and is provided with a locking hole 21.

On the other hand, an operating piece cutout 22 is formed on the opposite side of the movable contact piece cutout 18 provided on the rising piece 14. One end of the operating piece 23 abuts on the operating piece cutout 22. A hooking portion 24 of a tension coil spring 25 is formed on the operating piece 23, and a tension coil spring 25 is provided between the hooking portion 24 and a locking hole 21 provided in the movable contact piece 19.
Is mounted.

In the above structure, when the end of the operating piece 23 is pushed downward by the plunger 5, as a result, the tension coil spring 25
The contact 20 of the movable contact piece 19 is normally opened by the reversing action of the fixed contact piece.
When the contact is separated from the contact 13 and comes into contact with the contact of the normally closed fixed contact piece 12, switching of the switch is executed.

When the pressing force of the actuating piece 23 is removed, the tension coil spring
By 25, the contact relationship between the movable contact piece 19 and the fixed contact pieces 12, 13 is restored to the original state.

A light-emitting body 26 is provided in a substantially central portion of the upper surface of the base 1, and a light-emitting body terminal 27 projects from the lower surface of the base 1 (see FIG. 2).
A pair of holders 4 having U-shaped cross sections on both sides of the light emitting body 26.
And a pair of cylindrical holders 28 are formed on the base 1 so as to project.

Next, the switch locking device of the present invention will be described in detail with reference to FIG.

Two-step recesses 31, 32 are formed on the side surface of the base 1 on the side of the holding body 4 having a U-shaped cross section, and the hook pin support holes 3 are provided in the recesses 32. Vertical grooves 33 are formed on both sides of the recesses 31 and 32 downward from the upper surface of the base 1. Further, positioning projections 34 are formed on the right and left sides of the hook pin support hole 3 so as to project from the surface of the recess 31 to position the elastic plate described later.

When assembling the lock device, the lower end hook-shaped portion of the hook pin 8 formed in a U shape is inserted into the hook pin support hole 3, and the elastic plate 35 is arranged to press the upper and lower back surfaces of the hook pin 8 from the outside. The elastic plate 35 is formed by integrally forming an upper projecting piece 36, a lower projecting piece 36 ', and left and right side pieces 37, and the upper projecting piece 36 and the lower projecting piece 36' constitute an arcuate portion. It has a spring action.

A side projection 38 is formed so as to project from the side piece 37 to the left and right, and the side projection 38 is elastically inserted into the vertical groove 33.

Further, the side piece 37 is provided with a hole 39 that engages with a positioning protrusion 34 formed in a recess 31 on the side surface of the base 1 to position the elastic plate 35.

By the elastic action of the elastic plate 35 attached in this way, the back surface of the hook pin 8 is pressed by the upper and lower projections 36, 36 '.

A heart cam 6 for restricting the vertical movement of the hook pin 8 is formed on one side surface of the substantially square plunger 5 (see FIG. 4). Below the heart cam 6, as shown in FIG. 1, a guide groove 41 is formed which connects the cam groove 7 of the heart cam 6 and the lower end 40 of the plunger.

Further, as shown in FIG. 2, a pair of guide bars 42 to be inserted into the holes 29 (see FIG. 4) of the cylindrical holding body 28 are provided on the back side of the plunger 5. Since the guide rod 42 is engaged with the cylindrical holder 28 via the coil spring 43, the plunger 5 is pressed in the direction away from the base 1, and the plunger 5 is returned by the pressing force.

Further, although not shown, a protrusion for pressing the actuating piece 23 of the switch opening / closing mechanism 11 is formed on the lower surface of the plunger 5.

A square hole 45 composed of an inclined surface 44 is formed in the substantially central portion of the plunger 5, and the inclined surface 44 serves as a reflecting surface.
26 lights are emitted.

Therefore, when assembling the switch, the side faces of the U-shaped holding body 4 standing upright from the base 1 and the plunger 5 provided with the heart cam 6 are made to correspond to each other, and the cylindrical holding body 28 and the guide rod 42 are inserted to correspond to each other. Guide groove where the hook-shaped upper end of the hook pin 8 communicates with the cam groove 7 of the heart cam 6.
It is guided by 41 and is in a state of being locked to the heart cam 6 (see FIG. 3). In this state, the rectangular housing 46 is covered from above, and the protrusions 47 provided on the side surface of the base 1 and the recesses (not shown) provided on the inner surface of the housing 46 engage with each other to assemble them.

A square button 48 is mounted on the upper surface of the plunger 5 by engaging with a concave and convex.

The holding body 4 and the cylindrical holding body 28 having a U-shaped cross section are provided to reduce the play of the plunger 5, and are provided as needed.

Further, in the present embodiment, the illuminated type push button switch for a single pole has been described, but the present invention can be applied to various types such as a non-illuminated type and a multi-circuit type.

The present invention is not limited to the above-described embodiments, and various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention.

(Effect of the Invention) As described in detail above, according to the present invention, the switch opening / closing mechanism is provided on the upper surface, the hook pin supporting hole is formed on the side surface, and the base moves up and down with respect to the base. A plunger having a heart cam formed on its side surface extends between the base and the plunger, and an upper end hook-shaped portion is movably locked in a cam groove of the heart cam and a lower end hook-shaped portion engages with the hook pin support hole. In a locking device including a U-shaped hook pin to be stopped and an elastic plate integrally formed with a protruding piece that presses the back side of the hook pin, the cam groove of the heart cam and the lower end of the plunger communicate with the plunger. The guide groove is provided, and the upper and lower protrusions that press the upper and lower sides of the back side of the hook pin are provided, and the elastic plate having the holes on the flat surface and the side protrusions on both left and right sides is provided. And a vertical groove for fitting the hole of the elastic plate into the positioning projection of the base, and the side projection of the elastic plate is housed in the vertical groove of the base to secure the elastic plate. Since it is locked to the base, the following effects can be obtained.

(1) A guide groove for the hook pin is provided downward from the cam groove of the heart cam, and the upper and lower sides of the back surface of the hook pin are pressed by an elastic plate having upper and lower projecting pieces and the elastic plate is locked to the base. Therefore, the upper hook part of the hook pin can be locked to the heart cam provided on the plunger only by previously locking the elastic plate to the base via the hook pin and lowering the plunger from above. Therefore, assembling becomes easy and the assembling efficiency can be improved.

(2) Since the elastic plate is locked to the base via the hook pin, and the upper and lower parts of the back surface of the hook pin are pressed by the upper and lower projections provided on the elastic plate, the hook pin is pressed at two points. In addition, it is stable against vibration and shock, and therefore, the hook pin is prevented from coming off, and the lock operation can be prevented from being defective.

(3) Since the hook pin guide groove is provided downward from the cam groove of the heart cam, the upper and lower back surfaces of the hook pin are pressed by the elastic plates having the upper and lower projecting pieces, and the elastic plate is locked to the base. Since the plunger can be easily locked to the lock pin and is strong against vibration and shock, it can be moved as a semi-finished product. Therefore, an inexpensive push button switch can be obtained which contributes to the automation of assembly.

(4) The side projections provided on both left and right sides of the elastic plate are housed in the vertical groove by utilizing the elasticity thereof, and the elastic plate can be prevented from coming off.

(5) Since the positioning protrusion is formed on the base and the elastic plate corresponding to this is provided with the hole to engage the concave and convex portions,
The elastic plate is reliably positioned, and thus a stable push button switch locking device can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a lock device for a switch according to the present invention,
2 is a cross-sectional view of the switch of the present invention, FIG. 3 is a perspective view of a main part of the switch of the present invention, FIG. 4 is an exploded perspective view of the switch of the present invention, and FIG. 5 is an exploded view of a conventional switch lock device. It is a perspective view. 1 ... Base, 3 ... Hook pin support hole, 4 ... Holding body, 5 ... Plunger, 6 ... Heart cam, 7 ... Cam groove, 8 ... Hook pin, 33 ... Vertical groove, 34 ... Positioning Protrusion, 35 ... Elastic plate, 36 ... Upper protrusion, 36 '... Lower protrusion, 38 ... Side protrusion, 39 ... Hole, 41 ... Guide groove.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A switch opening / closing mechanism is provided on an upper surface of the base, a hook pin supporting hole is formed on a side surface of the base, a plunger that moves up and down with respect to the base and a heart cam is formed on a side surface, and between the base and the plunger. A U-shaped hook pin which extends and whose upper end hook-like portion is movably locked in the cam groove of the heart cam and whose lower end hook-like portion is locked in the hook pin supporting hole; and the back side of the hook pin. A locking device provided with an elastic plate integrally formed with a protrusion that presses the hook pin, the guide groove that connects the cam groove of the heart cam and the lower end of the plunger to the plunger, and In addition to providing the projecting pieces, the flat plate is provided with the holes and the elastic plates having the side projecting pieces on the left and right sides, and the positioning projections and the vertical grooves are provided on the base, and the positioning projections of the base are provided. A lock device for a push button switch, characterized in that the hole of the elastic plate is fitted in the base plate, the side projection of the elastic plate is housed in the vertical groove of the base, and the elastic plate is locked to the base. .