JPS5852986Y2 - push button switch - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pushbutton switch that can perform two-stage connection operations by pressing the pushbutton, and its purpose is to provide a pushbutton switch with smooth pushbutton operation. be.

1 and 2 show the structure of a conventional pushbutton switch, in which a circular recess 3 is formed on the inner bottom surface of a box-shaped housing 1, and a pair of fixed contacts 5 are formed around the recess 3. and 5, and a central fixed contact 6 are fixed, a pair of vertical grooves 9, 9 are formed in the cylindrical inner wall of the housing 1, and a movable contact member 13 is connected to the fixed contacts 5, 5, and the upper movable contact The member 14 is the fixed contact 1
2.12, and by pressing the push button 19, the movable contacts 14.13 are sequentially reversed and come into contact with each other,
When pressed further, the center fixed contact 6 is also contacted to perform a switch operation.

However, in the conventional example, the structure is complicated because the presser plate 2 is required to prevent the movable contact member 13 from jumping up, and there are also disadvantages such as the push button 19 being pressed while being tilted. .

The present invention is intended to eliminate the above-mentioned drawbacks, and embodiments thereof will be described in detail below with reference to FIG. 3 and the subsequent drawings.

FIG. 3 is a cross-sectional side view thereof, and FIG. 4 is an exploded perspective view, in which the same members as in FIG. 1 are designated by the same numbers.

The entire interior of the housing 1 is a substantially cylindrical cavity,
A circular recess 3 is formed on the inner bottom surface, and a pair of lower fixed contacts 5 and a center fixed contact 6 are fixed to the periphery of the recess 3. vertical grooves 9, 9 are formed, a step 10 is formed in the opening, and a plurality of protrusions 11 are protruded from the step 10.

The circumference of the circular recess 3 inside the casing 1 is an annular surface 4, and on the annular surface 4, at a peripheral portion partially inserted into the vertical grooves 9, another A pair of upper fixed contacts 12
and 12 are fixed, and small cylindrical projections 7 are formed on the annular surface 4.

The fixed contacts 5, 6, 12.12 all pass through the side wall of the housing 1 to form fixed terminals 5a, 6a, 12a, 12.
a (One terminal 12a is not shown in Fig. 4)
The lower fixed contacts 5, 5 are electrically connected to the terminal 5a, the center contact 6 is electrically connected to the terminal 6a, and the upper fixed contacts 12, 12 are electrically connected to the terminal 12a.

Note that the fixed contacts and fixed terminals are made of, for example, phosphor bronze plate or the like, which has been subjected to an appropriate plating treatment.

13 and 14 are movable contact members formed by punching out a suitable elastic conductive material such as a phosphor bronze plate, and the lower contact member 13 has a substantially spherical shape, and the upper contact member 14 has a substantially spherical shape.
Inside the annular peripheral part 15, there is an arcuate band 16 which is curved in an arc shape and becomes a movable part, and a protrusion 15 protruding from the peripheral part 15.
a, 15a, and 17.17 is a through hole.

Reference numeral 18 denotes an insulating plate provided with circular holes 18a, and through holes 18b are bored at positions corresponding to the small protrusions 7 on the ring top surface 4 inside the housing 1. It is.

Reference numeral 19 is a push button made of synthetic resin, and 1 is attached to the pressing part 20 and the lower end of the side surface.
A protrusion 22 is integrally formed on the pair of retaining pieces 21, 21 and the lower surface.

23 is a top plate attached to the stepped portion 10 of the housing, and the corner (L2
A mass-shaped guide wall 25 with grooves 26, 26 at the bottom is formed around the housing 1, and the protrusions 11 of the housing 1 are formed around the periphery of the housing 1.
Attachment holes 27... are formed at positions corresponding to....

Next, the assembly of the present invention will be described. First, the lower movable contact member 13 is placed in the recess 3 at the center of the casing 1 and brought into contact with the fixed contacts 5, 5, and then the through hole 18 of the insulating plate 18
After engaging the small protrusions 7 and placing them on the annular surface 4, the small protrusions 7 are tightened and fixed.

Next, when the projections 15 a , 15 a of the upper movable contact member 14 are engaged with and inserted into the longitudinal grooves 9 , 9 of the housing 1 , a portion of the annular peripheral portion 15 comes into contact with the upper fixed contact 12 , 12 .

Next, insert the push button 19 into the square hole 24 from below the top plate 23, keeping the retaining pieces 21, 21 engaged with the grooves 26, 26,
The top plate 23 is attached to the stepped portion 10 of the housing 1, and the protrusions 11 and
By tightening the upper plate 23, the upper plate 23 is fixed and the assembly is completed.

Next, the operation of the present invention will be described. When the push button 19 is pressed, the arcuate band 16 of the upper contact member 14 is flipped downward and comes into contact with the lower contact member 13 in the first operating position.
Terminals 12a and 5a are brought into conduction.

Next, when the push button 19 is further pressed, the contact member 13 comes into contact with the center contact 6, and the terminals 12 a , 5 a , and 6 a all become conductive.

Next, when the pressure is removed, the conduction between the terminals is sequentially released in the reverse order.

During this time, the insulating plate 18 prevents the lower contact member 13 from jumping up when the lower contact member 13 returns to its original shape,
Further, it prevents unnecessary contact with the upper contact member 14.

Furthermore, the push button 19 is loosely fitted into the guide wall 25 of the top plate 23 to prevent the push button from tilting when pressed.

As mentioned above, the present invention simplifies the complicated structure such as the presser plate in the conventional structure and prevents the push button from tilting when moving up and down, resulting in smooth operation and a good pressing feel. This brings about remarkable effects such as making it possible to reduce the thickness of the switch and make it even more compact.

Note that the shape of the push button is not limited to a rectangular shape, and a cylindrical push button may be fitted loosely into a top plate provided with a cylindrical guide wall, and such a configuration is also within the scope of the registered claims of the present invention. Of course it belongs.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional push button switch, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a sectional side view showing an embodiment of the present invention, and Fig. 4 is an exploded perspective view thereof. It is. 1... Housing, 5, 12... Peripheral fixed contact, 6... Central fixed contact, 13.14...
...Movable contact member, 18...Insulation plate, 19...
...Push button, 23...Top plate, 25...
・Guidance wall.

Claims (1)

[Scope of utility model registration request] at least two sets of peripheral fixed contacts disposed inside a casing made of an insulating material, one set of central fixed contacts, and an elastic conductive material that can be bent upward and reversed, and each of the fixed contacts a plurality of movable contact members brought into contact with each other, and an insulating plate with a central hole interposed between the movable contact members,
A push button switch characterized in that a push button slidably inserted through a guide wall of a top plate of a housing is disposed above the movable contact member.