JP2585104Y2 - Push button switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic reset type push button switch used for a car stereo or the like, and particularly to an elastic contact type.
Related to pushbutton switches.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional push button switch of this type has a box-shaped housing 1 provided with a circular stem sliding hole 2 which is opened at an upper portion thereof. A cylindrical stem 3 movably arranged, a movable contact portion 7 provided adjacent to the stem 3, and a fixed contact 8 provided on the bottom of the housing 1 to face the movable contact portion 7; Is configured. And the housing 1
A long groove 10 that allows the stem 3 to move up and down is formed on the inner side wall of the groove. A hook 4 is formed on an outer wall of the stem 3 so as to slidably engage with the long groove 10. In addition,
The movable contact portion 7 includes a rubber contact 5 having a movable contact fixed to an inner ceiling, and a dome-shaped support wall 6 for supporting the rubber contact 5. In the conventional push button switch having such a configuration, when the stem 3 is pressed, the support wall 6 is bent, the rubber contact 5 is lowered, and when the stem 3 is continuously pressed, the rubber contact 5 and the fixed contact 8 come into contact with each other to establish an electrically conductive state. Become. When the pressing is stopped, the support wall 6 returns to the original shape, and the rubber contact 5 and the fixed contact 8 that have come into contact with each other are separated from each other, and become in a non-conductive state. Then, the hook 4 is engaged with the uppermost portion of the long groove 10, and the stem 3 stops. Thus, the engagement of the hook 4 and the long groove 10 prevents the stem 3 from coming out of the sliding hole 2.
Further, the entire cylindrical side wall of the stem slides on the inner side wall of the housing 1 to prevent rattling of the stem 3.

[0003]

In recent years, there has been a demand for minimizing the axial dimension (dimensions a, b, and c in FIG. 5) of the stem in accordance with the demand for lighter and smaller pushbutton switches. Therefore, a push-button switch as shown in FIG. 6 is conceivable to reduce the thickness and the size of the push-button switch while securing the stroke of the stem. This push button switch has a stem sliding hole 32 opened at one end thereof in a housing 31.
A flange 33a is provided at one end of the stem 33 having a diameter smaller than that of the stem sliding hole 32 so as to slidably fit in the stem sliding hole 32, and a flange of the stem 33 is provided at one end of the housing 31. The stem 3 comes into contact with the end face of the
It is conceivable to provide a cover 34 for preventing the 3 from coming off. However, in the case of the structure shown in FIG.
The stem 33 can be prevented from coming off, but the thinned stem 33 comes into sliding contact with the sliding hole 32 only by the flange portion 33a.
Between the contact points 5 and 8 is likely to occur due to the clearance between the contact points 5 and 8. Further, when the stem 33 is pressed obliquely, the stem 33 returns obliquely even when the stem 33 is restored, so that an excessive force is applied to the abutting surface between the cover 34 and the projection that holds the cover 34, and the cover 34 is pressed. -3 due to the dimensional variation of
4 comes off and the stem 34 is easily detached from the housing 31. The present invention has been made in view of such problems, and in a state where the push button switch is made thinner and smaller, rattling of the stem in the stem sliding hole of the housing can be prevented, and the stem can be connected to the stem of the housing. An object of the present invention is to provide a structure of a push button switch that can be securely held in a sliding hole.

[0004]

Means for Solving the Problems] Rutotomoni provided a stem slide hole which opens at one end thereof to the push-button switch housing according to the present invention in order to achieve this object, a fixed contact provided at the bottom of the stem slide hole the movable contact opposite to the said fixed contact to the stem slides within the bore and the stem is brought into contact with the fixed contact and presses the movable contact slidably engaged, on a side surface of the stearyl <br/> arm It extends from the vicinity of one end portion of the stem that presses the movable contact to the other end of the stem to form a concave groove which is open to the other end, outside of the ribs formed between the concave grooves along the concave groove
The peripheral end and the outer peripheral end of one end of the stem are formed on the same plane.
And, a cover having an insertion hole for inserting the stem at one end of the housing is provided, the insertion hole of the cover to form a protruding portion slidably engaged in the concave groove of the scan <br/> Temu The said
When the stem slides, the convex portion contacts the end face of the concave groove of the stem.
A rib that contacts and is formed between the concave grooves of the stem
The outer peripheral end of the housing and one end side surface of the stem are
It is formed so as to be in sliding contact with the inner surface of the tem sliding hole . Further forms a protrusion forming a longitudinal groove extending in the sliding direction of the stem to the inside surface of the stem slide hole of the housing, slidably engaged with the vertical groove on one end portion side surface of the stem It is characterized by becoming.

[0005]

According to the above construction, a portion which is in sliding contact with the inner surface of the stem sliding hole of the housing can be secured over the entire length of the stem, so that rattling of the stem is eliminated. Since the projection of the cover comes into contact with the end face of the groove of the stem, the stem cannot be removed. Further, the vertical groove formed in the stem sliding hole of the housing and the projection provided on the side surface of one end of the stem are brought into sliding contact with each other, whereby rattling of the stem can be further prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an assembled perspective view of the push button switch of the present invention. FIG. 2 is a sectional view of the push button switch.
FIG. 3 is an exploded perspective view of the push button switch. The same components as those of the conventional push button switch described above are denoted by the same reference numerals.

As shown in FIGS. 1 to 3, a push button switch according to an embodiment of the present invention is provided in a box-shaped housing 11 having a stem sliding hole 11a, and disposed in the stem sliding hole 11a of the housing 11. A movable contact portion 7, a fixed contact 8 opposed to the movable contact portion 7 and arranged at the bottom of the stem sliding hole 11 a, and a fixed contact located in the stem sliding hole 11 a via the movable contact portion 7. Stem 13 arranged on the opposite side to 8
And a cover 12 for covering the housing 11. The movable contact portion 7 includes a rubber contact 5 that can be electrically connected to the fixed contact 8 and a dome-shaped support wall 6 that supports the rubber contact 5 on the ceiling. Stem 13
A plurality of concave grooves 13a extending from the vicinity of one end pressing the rubber contact 5 to the other end and opening at the other end are formed on the side surface of. Therefore, this stem 13 is adjacent to the concave groove 1.
3a, ribs 13b extending from near one end to the other end of the stem 13 are formed.
Of the stem 13 and one end side surface 13c of the stem 13 are in sliding contact with the inner side surface of the cylindrical stem sliding hole 11a. On the outer wall of the housing 11, a claw portion 11b for locking the cover 12 is provided. Cover 12 is stem 1
3 through which the insertion hole 14 is inserted.
Is formed with a convex portion 14a that engages with the concave groove 13a of the stem 13.

In this push button switch, the stem 1
When the rubber contact 5 is pressed, the rubber contact 5 approaches the fixed contact 8. When the stem 13 is further pressed, the support wall 6 is bent, and the rubber contact 5 and the fixed contact 8 are brought into contact with each other to be in an electrically connected state.
During this time, since the outer peripheral end of each rib 13b of the stem 13 and the side surface 13c at one end are in sliding contact with the inner wall of the stem sliding hole 11a, rattling during movement of the stem 13 is prevented. When the pressing of the stem 13 is stopped, the rubber contact 5 separates from the fixed contact 8 due to the restoring force of the rubber material of the rubber contact 7 and becomes non-conductive. At this time, similarly to the time of pressing, the outer peripheral end of each rib 13b of the stem 13 and the one end side surface 13c
Since the stem 13 is in sliding contact with the inner wall of the stem sliding hole 11a, rattling during movement of the stem 13 is prevented. The stem 13 is prevented from falling out of the stem sliding hole 11a by the end 13d of each groove 13a abutting on the projection 14a of the cover 12.

Therefore, in this embodiment of the present invention, no rattling occurs even if the height of the stem 13 is reduced to reduce the thickness and size of the push button switch.
The rubber contact 5 can reliably contact the fixed contact 8 even when a force oblique to the axial direction is applied to the stem 1 and the stem 1
3 can be prevented from coming off.

Next, another embodiment of the present invention will be described with reference to FIG. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, as shown in FIG. 4, a vertical groove 11c is formed on the inner surface of the stem sliding hole 11a of the housing 11, and a projection 13e engaging with the vertical groove 11c is formed on one side 13c of the stem 13. Are formed. Therefore, the protrusion 13 is formed in the vertical groove 11c.
By the engagement sliding of e, rattling during sliding of the stem 13 can be more reliably prevented. The push button switch of the present invention is not limited to the above-described embodiment.
The stem is not limited to a substantially cylindrical shape, and may be, for example, a prismatic shape. In this case, the number of concave grooves is not limited to four.

[0011]

[Effects of the Invention] Since the present invention is constructed as described above, rattling does not occur even if the height of the stem is reduced, and there is no possibility of poor electrical contact or malfunction.
Then, the stem can be securely held in the stem sliding hole so as not to come off from the housing. Therefore, it is possible to provide a push button switch that can achieve a reduction in thickness and size of the push button switch, prevention of rattling, and prevention of removal of the stem.
Further, the engagement between the vertical groove of the housing and the projection of the stem makes it possible to more reliably prevent the above-mentioned rattling and stem removal.

[0012]

[Brief description of the drawings]

FIG. 1 is an assembled perspective view of the push button switch of the present invention.

FIG. 2 is a sectional view showing one embodiment of the push button switch of the present invention.

FIG. 3 is an exploded perspective view showing one embodiment of the push button switch of the present invention.

FIG. 4 is an exploded perspective view showing another embodiment of the push button switch of the present invention.

FIG. 5 is a sectional view showing a conventional example of a push button switch.

FIG. 6 is a cross-sectional view illustrating a reference configuration example of a push button switch.

[Explanation of symbols]

 Reference Signs List 5 Rubber contact (movable contact) 8 Fixed contact 11 Housing 11a Stem sliding hole 11c Vertical groove 12 Cover 13 Stem 13a Recessed groove 13b Rib 13c One end side surface 13d One end 13e Projection 14 Insertion hole 14a Projection

Claims (2)

(57) [Scope of request for utility model registration] 1. A Rutotomoni provided a stem slide hole which opens at one end thereof to the housing, a fixed contact provided at the bottom of the stem slide hole, and the movable contact opposite to the said fixed contact to said stem sliding inside a hole, in the push-button switch fitted slidably the stem is brought into contact with the fixed contact and presses the movable contact, extending from the vicinity of one end portion of the stem that presses the movable contact to the side surface of the stem to the other end of the stem To form a groove that opens at the other end, and is formed between the grooves along the groove.
The outer peripheral end of the rib and the outer peripheral end of one end of the stem are
Formed in the surface, the cover having an insertion hole for inserting the stem at one end of the housing is provided, forming a convex portion engaged slidably in the concave groove of the stem into the insertion hole of the cover
When the stem is slid, the convex portion is formed in the groove of the stem.
Abuts the end surface and is formed between the grooves of the stem
The outer edge of the rib and the side of one end of the stem
Formed so that it slides against the inner surface of the stem sliding hole of the jing.
A push button switch, characterized in that: 2. A longitudinal groove is formed extending in the sliding direction of the stem to the inside surface of the stem slide hole of the housing, a protrusion slidably engages the longitudinal groove at one side surface of the stem The push button switch according to claim 1 formed.