JPH04328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a push button switch, and more particularly to a locking device for a push button switch. It is generally desired that a locking device for a push-button switch, a so-called push-button switch, be small and easy to assemble.

[Prior art and its problems]

As a conventional locking device for a push button switch used for emergency stop, the one shown in FIG. 1 is known.

In Fig. 1, 1 has a push button 2 screwed into the head, a groove 1A at the lower end, an inclined surface 1B, and a protrusion 1C.
A push rod 4 has a pin 6 which is movably housed in a guide case 9 attached to the case 13 with a screw 15 and is pressed toward the push rod 1 by a spring 3.
1 is a lower push rod that is guided by the base 16 and operates the switch 5; 7 and 8 are return springs; 11 is a nut for attaching the case 13 to the mounting panel 10;
Reference numeral 2 designates a gasket that seals water and oil from the surface of the mounting panel 10 and also serves to adjust the thickness of the mounting panel 10. Numeral 14 designates a gasket that seals water and oil that enter through the gap between the push button 2 and the case 13. .
The operation of the push button switch shown in FIG. 1 is as follows. That is, when the push button 2 is pressed, the push rod 1 is pushed down, and the pin 4, which was in contact with the groove 1A provided at the lower end of the push rod 1, is moved to the inclined surface 1B.
is guided by and moves outward against the spring 3.
When the push rod 1 is further pushed down and the pin 4 passes over the protrusion 1C of the push rod 1, the pin 4 is moved inward by the spring 3 and projects onto the upper surface of the protrusion 1C to maintain the pressed state of the push button 2. At this time, the push rod 1 pushes down the lower push rod 6, and the lower push rod 6 operates the switch 5. Next, when releasing the pressed state of the push button 2, the push rod 1 is rotated by rotating the push button 2. At this time, as shown in FIG. 1A, the protrusion 1C is formed with a groove 1D through which the pin 4 can pass and which communicates with the groove 1A.
The return spring 7 is biased when aligned with the groove 1D of C,
8, the push rod 1 and the lower push rod 6 return to the state shown in FIG. 1, and the pin 4 returns to the groove 1A. The return spring 8 is composed of a torsion spring that also serves as a push spring and has one end locked to the push rod 1 and the other end locked to the guide case 9, so that the push rod 1 is returned to its original position before rotation, and the pin 4 and the protrusion are The rotational positional relationship of 1C with groove 1D is returned to the position shown in FIG. 1A.

By the way, in the conventional device shown in FIG. 1, the push rod 1, the pin 4 that locks the push rod 1, and the lower push rod 6 that operates the switch 5 are arranged in series in the axial direction of the push rod 1, so that the depth dimension is This makes it difficult to downsize the control panel box in which the push button switch is installed, for example. Furthermore, since each component must be assembled into the case 13 one after another during assembly, the assembly work is performed inside the narrow case 13, resulting in poor workability.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a push button switch which eliminates the drawbacks of conventional devices, has a short depth dimension, and can improve the workability of assembly work.

[Key points of the invention]

This purpose, according to the present invention, includes a push rod loosely fitted in a case, a ring-shaped lock member fixed to one end of the push rod and having a plurality of pins on the outer periphery, and a ring-shaped lock member coupled to the push rod via the lock member. , a ring-shaped push plate having a leg for operating the switch at its tip; a lock plate disposed opposite to the pin of the lock member so as to be able to guide the pin; a guide groove having a stepped groove that guides the pin of the member only in the pushing direction of the push rod; and a guide groove that is connected to both ends of the groove and has a portion that guides the pin in the rotational direction; and the lock plate is coupled to the case. and a base that elastically supports the locking member in a diametrically deformable manner. By providing a plurality of pins on the outer periphery of the lock member and arranging the lock plate outside the lock member and the push plate for operating the switch, the depth dimension of the push button switch can be shortened.

It is also possible to arrange a lamp within the push rod by configuring the push rod in a hollow cylindrical shape.

[Embodiments of the invention]

2 to 4 each show an embodiment of the present invention, in which FIG. 2 is a longitudinal sectional view of a push button switch, FIGS. 3 and 4 are exploded perspective views of essential parts, and FIG. In the figure, parts having the same functions as those shown in FIG. 1 are given the same reference numerals, and their explanations will be omitted.

In FIG. 2, reference numeral 20 denotes a hollow cylindrical push rod with a push button 2 screwed into its head and guided and supported by a case 21 made of synthetic resin. The lock member 22, push plate 23, and lock plate 24 housed within the synthetic resin base 25 will be explained using the exploded perspective view shown in FIG. The locking member 22 is ring-shaped and has a plurality of pins 22 on its outer periphery, in this case two pins 22.
A, and has a protrusion 22B on the inner periphery. A notch 20A (see FIG. 2) provided at the lower end of the push rod 20 engages with the protrusion 22B of the lock member 22. The push plate 23 is ring-shaped and has an upper projection 23A, a leg 23B for operating the switch, and a pin 23C. The upper protrusion 23A of the push plate 23 has a hole 20B formed in the push rod 20 inserted between the two protrusions (see Fig. 2).
The pin 23C is locked in the guide groove 2 of the base 25.
5C so that the push plate 23 can be moved only in the axial direction. The lock plate 24, which is inserted with some play into the groove 25E of the base 25 facing the pin 22A of the lock member 22, has a guide groove 2 through which the pin 22A can pass.
4A, and there is a stepped portion 2 in the middle of this guide groove 24A.
4B, and the guide groove 24A forms a substantially triangular passage for the pin 22A. A plate spring 26 is pressed into the recess 24D on the back side of the lock plate 24, and since the lock plate 24 is loosely fitted into the groove 25E of the base 25, the plate spring 26 locks the lock plate 24 into the pin 22A of the lock member 22. It is biased so as to press against it. This leaf spring 26
is fitted into the groove 25D of the base 25.

To assemble the lock member 22, push plate 23, lock plate 24, and leaf spring 26 to the base 25, first
The press plate 23 is attached to the base 25 by aligning the pin 23C of No. 3 with the guide groove 25C of the base 25 and aligning the leg portion 25B with the hole 251 of the base 25 (see FIG. 2). At this time, a protrusion 25 is provided on the base 25 to prevent the push plate 23 from falling to the eaves of the base 25.
2 is formed, and a push plate 23 is formed on this protrusion 252.
The edge of the hook catches. Next, the grooves 25D, 2 of the base 25
After inserting the leaf spring 26 and the lock plate 24 into the push plate 5E, the lock member 22 is inserted from above the push plate 23. At this time, the ring-shaped portion of the locking member 22 is located outside the upper projection 23A of the push plate 23, and the pin 22A of the locking member 22 is aligned with the guide groove 24A of the locking plate 24. After assembling the lock member 22, push plate 23, lock plate 24, and leaf spring 26 into the base 25 in this way, for example, attach the tongue piece 18A of the lid 18 to the base 25 as shown by the dashed line in FIG.
It can also be fitted into the windows 25F of No. 5 to form a single unit.

To assemble the unitized base 25 into the case 21 as described above, the base 25 is first inserted from the bottom of the case 21. At this time, the push rod 20 is adjusted so that the upper protrusion 23A of the push plate 23 is aligned with the hole 20B provided in the push rod 20. base 25
When inserted into the case 21, the protrusions 25B provided at the ends of the elastic legs 25A provided at four locations on the base 25 fit into the windows 21A of the case 21, thereby coupling the case 21 and the base 25. Legs 23B of the push plate 23 protrude from the bottom of the base 25.
Push up the upper protrusion 23A of the push plate 23 to push the push rod 2
The assembly is completed by locking it in the hole 20B of 0. In FIG. 2, 27 is a gasket provided between the push rod 20 and the case 21, and 28 is a lamp. When the lamp 28 shown by the dotted line is housed in the hollow cylindrical push rod 20, the conductive metal fittings 29, 30 and the contact spring 31 as shown in FIG.
mounted on. The conductive metal fitting 29 is placed in the groove 25H of the base 25, and the conductive metal fitting 30 is placed in the groove 25J of the base 25.
inserted into. The contact spring 31, which is held at one end by the conductive metal fitting 29, is engaged with a protrusion 25K provided on the base 25.

Next, the operation will be explained. Figures 5 to 7
The figures are operation explanatory diagrams showing main parts in cross section to explain the operation, and FIGS. 5A to 7A are operation explanatory diagrams showing the positional relationship between the groove 24A of the locking plate 24 and the pin 22A of the locking member 22, respectively. It is. Before operating the push button switch, the fifth
As shown in FIG. 5A, the pin 22A of the locking member 22 is located at the upper part of a stepped portion 24B formed in a vertical portion of the guide groove 24A of the locking plate 24 so as to guide the pin 22A only in the pushing direction of the push rod. However, the legs 23B of the push plate 23 do not protrude from the base 25 but are recessed into the base. Now, when the push button 2 is pressed in FIG. 2, the lock member 22 and the push plate 23 are pushed down via the push rod 20. When the lock member 22 is pushed down, the pin 22A of the lock member 22 is guided by the guide groove 24A of the lock plate 24 and slides on the slope of the step 24B formed in the guide groove 24A. At this time, the lock plate 24 is connected to the leaf spring 26.
move outward against the force of When the pin 22A of the locking member 22 climbs over the step 24B formed in the guide groove 24A of the locking plate 24, the locking plate 24 is moved by the leaf spring 26 to the pin 22A of the locking member 22.
The lock plate 24 moves inward as shown in FIG.
A pin 22A of the locking member 22 is locked to B.
When the pin 22A of the lock member 22 is engaged with the step 24B of the guide groove 24A of the lock plate 24, the push button 2 is maintained in a pressed state, and at this time, the leg 23B of the push plate 23 protrudes from the base 25 to open/close the button. Operate the device 5. Next, to release the pressed state of the push button 2, the push button 2 shown in FIG. 2 is rotated clockwise when viewed from above. This push button 2
When the push rod 20 rotates with the rotation of the push rod 20
Since the projection 22B of the lock member 22 is fitted into the notch 20A provided at the lower end of the lock member 22, the lock member 22 rotates at the same time. At this time, the push plate 23
The pin 23C shown in the figure is located in the guide groove 25 of the base 25.
C, so it does not rotate, and the push rod 20 is inserted into the elongated hole 20B relative to the upper projection 23A of the push plate 23.
This prevents rotation from being blocked. The rotation of the lock member 22 causes the pin 22A to move along the horizontal portion of the guide groove 24A of the lock plate 24, and
When the position shown in the figure is reached, the locking of the pin 22A of the locking member 22 by the stepped portion 24B of the locking plate 24 is released. When the locking of the pin 22A by the stepped portion 24B is released, the pin 22A of the locking member 22 is moved into the groove 24 of the lock plate 24 by the action of the return spring 8.
It returns to the original state shown in FIGS. 5 and 5A through the inclined portion 24C, which is a part of A.

[Effects of the Invention] As explained above, according to the present invention, there is provided a push rod that is loosely fitted into a case, a lock member that engages with one end of the push rod, is rotatable in conjunction with the push rod, and has a plurality of pins on the outer periphery. , a push plate that fits into the push rod via the lock member and has legs for operating the switch, and a guide groove that is arranged opposite to the pin of the lock member and guides the pin of the lock member. By configuring a push button switch with a lock plate having a stepped portion for locking the pin of the lock member in a part of the guide groove, and a base that is fitted into the case and supports the lock plate, the following can be achieved. has advantages. That is, (1) the depth dimension of the push button switch can be reduced by providing a plurality of pins on the outer periphery of the lock member and arranging the lock plate that locks the pins of the lock member on the outside of the push plate for operating the switch; Can be shortened.

(2) The locking member, push plate, and locking plate can be incorporated into the base to form a unit, making it easier to handle, and the assembly is completed by inserting the unitized base into the case, so assembly is possible. Work becomes easier.

(3) By making the push rod into a hollow cylindrical shape, a lamp can be housed within the push rod, and a push button switch with a lamp and a push button switch without a lamp can be manufactured on the same production line. can.

It has the following excellent advantages.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing a conventional device, FIG. 1A is a sectional view of a main part taken along the line A-A in FIG.
The figure is a longitudinal sectional view, FIGS. 3 and 4 are exploded perspective views, and FIGS. 5 to 7 and 5A to 7A are operation explanatory views, respectively. 20: push rod, 21: case, 22: lock member, 22A: pin, 23: push plate, 23B: leg,
24: Lock plate, 24A: Guide groove, 24B: Step, 25: Base.

Claims (1)

[Scope of Claims] 1. A push rod loosely fitted in a case, a ring-shaped lock member fixed to one end of the push rod and having a plurality of pins on the outer periphery, and coupled to the push rod via the lock member, a ring-shaped push plate having a leg for operating the switch at the tip; a lock plate disposed opposite to the pin of the lock member so as to be able to guide the pin; and the lock member provided on the lock plate. a guide groove having a stepped groove that guides the pin only in the pushing direction of the push rod, and a groove that communicates with both ends of the groove and has a part that guides the pin in the rotational direction;
A push button switch comprising a base coupled to the case and elastically supporting the lock plate so as to be deformable in the diametrical direction of the lock member. 2. The push button switch according to claim 1, wherein the push rod has a hollow cylindrical shape.