JPH0116261Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a button mechanism which is an operating part of a push switch.

Conventional button mechanisms of this type include those shown in FIGS. 1 and 2. That is, in FIG. 1, A is a key top for opening and closing the switch, and a groove B is formed on the outer periphery near the tip of the key top. On the other hand, the button C is formed with a fitting part D that can be freely fitted with the key top A, and the key top A is formed on the inner surface of the opposing upper wall part _D1 and lower wall part _{D2 of} the fitting part D. A protruding portion E that can freely engage with the groove B of is provided in a protruding manner. Also, the left and right side walls D ₃ and D ₄ of the fitting part D
A slit F is formed in the center of the upper wall.
An elastic force in the vertical direction is applied to _D1 and the lower wall portion _D2 .

Therefore, when the fitting part D of the button C is inserted into the key top A, the tip of the key top A is inserted into the protruding part E.
When contacting and getting over this, the upper wall part D ₁
and the lower wall part _D2 are pushed outward, and when the groove B of the key top A engages with the protrusion E, the upper wall part _D1
The lower wall part _D2 has been restored to suppress vertical wobbling.

In addition, in Fig. 2, projections _G1 and _G2 are provided on the upper and lower surfaces of the tip of the key top A, and the front surface thereof is formed into a slope to facilitate insertion of the fitting part D of the button C. has been done. On the other hand, the fitting part D of the button C has the above-mentioned protrusion _G1 on the upper wall part _D1 and the lower wall part _D2 .
Locking holes H ₁ and H 2 into which G ₂ and G ₂ fit are formed. In the figure, the same numbers as those in FIG. 1 indicate the same structure.

Therefore, when the fitting part D of the button C is inserted into the key top A, the upper wall part D _{1 and the lower wall part D 2 of} the fitting part D are pushed outward by the protrusions G ₁ and G ₂ , and the protrusion
When G ₁ and G ₂ fit into the locking holes H ₁ and H ₂ , they are restored to their original state and prevent vertical wobbling.

However, in both of the above two conventional examples, the key top A and the fitting part D of the button C engage only in the vertical direction, and elastic force is imparted to the upper wall part _D1 and the lower wall part _D2 . However, since the left and right side wall portions D ₃ and D ₄ are completely unrelated to the key top, rattling in the left and right direction is likely to occur, making it difficult to obtain a sufficient fit between the two side walls A and C.

Therefore, in order to solve the above-mentioned drawbacks, the present invention aims to achieve a stable fitted state between the key top and the button fitting part by fitting them with elastic force on four sides (top, bottom, left and right). This is to provide a button mechanism for the push switch.

Hereinafter, the present invention will be explained based on the embodiments shown in the drawings. Fig. 3 is an exploded perspective view of the button mechanism according to the invention, Fig. 4 is a cross-sectional view thereof, Fig. 5 is a longitudinal sectional view thereof, FIG. 6 is a longitudinal sectional view of the assembly.

In the above drawings, reference numeral 1 denotes a key top for opening and closing the switch, and the key top 1 has a pair of flat plate parts 2 and 3 arranged vertically and parallel to each other with an upright part 4 interposed therebetween, and has an inward elastic force at its tip. Give power. Incidentally, since the U-shaped key top 1 is actually formed by resin molding, the flat plate portions 2 and 3 are inclined inward toward the tip due to the difference in cooling rate. Furthermore, locking recesses 5 and 6 are formed at corresponding positions on the side edges of both flat plate parts 2 and 3, respectively. 7 is a light emitting element such as an LED, and the element 7
is located on the upright part 4 of the key top 1, and 8
1 is a light emitting part of the light emitting element 7, 9 is a lead wire, and 10 is a switch case.

11 is a button, the button 11 is composed of a base 12 and a fitting part 13 that can be fitted to the key top 1;
At the center of the front surface of the base 12 is a protrusion 12 shaped like a rectangular parallelepiped.
A is provided. On the other hand, the fitting part 13 is formed by four support arms 14A, 14B, 15A, and 15B spaced apart from each other in parallel to each other, and elastic forces are applied to each of them in the upward and left-right directions. Further, the left and right support arms 14A, 14B and 15A, 15B have wall surfaces 16a, 16b that come into contact with the side edges of the flat plate parts 2, 3.
and guide receivers 17a, 17b which come into contact with the side portions of the opposing surfaces 2a, 3a of the flat plate parts 2, 3 are formed in the longitudinal direction, and 18 is the end wall thereof. The guide receivers 17a and 17b have slopes 19a and 19a that gradually rise toward the end wall 18 from the free ends of the support arms 14A and 14B and 15A and 15B, respectively.
19b, and horizontal surfaces 20a, 20b are formed near the end wall 18, and the width between the upper and lower horizontal surfaces 20a, 20a is the same as that of the flat plate portion 2,
The width is set to be the same as the width between the opposing surfaces 2a and 3a in the upright portion 4 of No. 3. Moreover, the support arm 14A,
14B, 15A, 15B, wall surfaces 16a, 16b are protrudingly provided with locking protrusions 21a, 21b which are removable from the locking recesses 5, 6 of the flat plate portions 2, 3 at the positions of the slopes 19a, 19b. .

22 is a button cover that fits over the base 12 and fitting part 13 of the button 11, and 22a indicates a hole into which the protrusion 12a of the base 12 enters.

Here, the above button 11 and button cover 2
2, the button 11 is made of transparent resin and the button cover 2 is made of transparent resin in order to transmit the light from the light emitting element 7.
2 are each made of an impermeable resin.

Next, the assembly of the above embodiment will be explained.
First, when the fitting part 13 of the button 11 is inserted into the key top 1, the opposing surfaces 2a of the flat plate parts 2 and 3,
The side portions of the guide receivers 17a, 17b come into contact with the slopes 19a, 19b, and the corner portions of the tips of the flat plate portions 2, 3 abut against the locking protrusions 21a, 21b. When the button 11 is further inserted, the support arm 1
4A, 14B and 15A, 15B are pushed apart in the left and right direction, and the locking protrusions 21a, 21b are attached to the flat plate portion 2,
3, and the tips of the flat plate portions 2 and 3 slide on the slopes 19a and 16b, thereby gradually being spread apart in the vertical direction. and,
When the locking projections 21a, 21b reach the locking recesses 5, 6 of the flat plate parts 2, 3, the support arms 14A, 14B
Due to the restoring forces of 15A and 15B, the locking protrusions 21a and 21b fit into the locking recesses 5 and 6, and the opposing surfaces 2a and 3a at the tips of the flat plate portions 2 and 3 engage with the guide receivers 17a and 15B. 17b horizontal planes 20a, 20b
is crimped. As a result, the flat plate portions 2 and 3 of the key top 1 fit into the button 11 without play in the horizontal and vertical directions. After that, the button cover 22 is fitted onto the button 11 from the direction of the base 12 to complete the assembly. Then, the light emitting part 8 of the light emitter element 7
When the light from the button 11 passes through the protrusion 12a of the button 11, it becomes a self-illuminated push switch.

As described above, the present invention provides a button mechanism for a push switch consisting of a key top 1 for opening and closing the switch, and a button 11 that can be fitted into the key top 1.
3 are arranged parallel to each other, and the tips thereof are given an inward elastic force, and locking recesses 5 and 6 are formed at the corresponding positions on the side edges of both flat plate parts 2 and 3, respectively, and the button 11 is a guide receiver 17a, 1 that guides the tip of the key top 1 by pushing it outward.
7b, and a locking protrusion 21a that engages with the locking recesses 5 and 6 of the key top 1 and applies elastic force inward.
21b. Therefore, the locking protrusions 21a and 21b fit into the locking recesses 5 and 6, and the key top 1 and the button 11 fit together perfectly without any play due to the vertical and horizontal elastic forces. .

[Brief explanation of the drawing]

1 and 2 are perspective views showing conventional button mechanisms, FIG. 3 is an exploded perspective view of the button mechanism according to the present invention, FIG. 4 is a cross-sectional view of the same, and FIG. 5 is a longitudinal cross-section of the same. The plan view and FIG. 6 show a longitudinal cross-sectional view when the same is assembled. 1... Key top, 2, 3... Flat plate part, 5, 6
... Locking recess, 7 ... Light emitting element, 11 ... Button, 17a, 17b ... Guide receiver, 21a, 21
b...Latching protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) In a button mechanism for a push switch consisting of a key top for opening and closing the switch and a button that can be freely fitted to the key top, the key top has a pair of flat plate parts arranged in parallel, In addition to imparting inward elastic force to the tip, locking recesses are formed at corresponding positions on the side edges of both flat plate portions, and the button is configured to push the tip of the key top outward. What is claimed is: 1. A button mechanism for a push switch, comprising: a guide receiver for guiding the key top; and a locking protrusion that engages with a locking recess of a key top and is elastically applied inward. (2) A push switch according to claim 1 of the utility model registration claim, characterized in that a light-emitting element is arranged in the center of the key top, and at least a part of the button is configured to allow light from the light-emitting element to pass through. button mechanism.