JPH0594915U - Push button switch - Google Patents

Abstract

(57) [Abstract] [Purpose] With the push button switch made thin and compact, it is possible to prevent rattling of the stem in the stem sliding hole of the housing, and also to securely hold the stem in the stem sliding hole. A push button switch structure is provided. [Structure] The housing 11 is provided with a stem sliding hole 11a opening at one end thereof. A fixed contact 8 is provided at the bottom of the stem sliding hole 11a, and a rubber contact 5 which is a movable contact facing the fixed contact 8 in the stem sliding hole 11a and a rubber contact 5 are pressed to come into contact with the fixed contact 8. The stem 13 is provided. On the side surface of the stem 13, a concave groove 13a extending from one end of the stem 13 near the one end pressing the rubber contact 5 to the other end is formed.
An insertion hole 14 through which the stem 13 is inserted at one end of the housing 11.
Attach the cover 12 having the. Cover hole 14
Is provided with a protrusion 14a that engages with the concave groove 13a of the stem 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic reset type push button switch used for a car stereo or the like, and more particularly to an elastic contact type push button switch.

[0002]

[Prior 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 opening at the top thereof, and is arranged inside the stem sliding hole 2 so as to be vertically movable. And a movable contact point portion 7 provided adjacent to the stem 3, and a fixed contact point 8 provided at the bottom of the housing 1 so as to face the movable contact point portion 7. Is configured. A long groove 10 is formed on the inner wall of the housing 1 to allow the stem 3 to move up and down. A hook 4 that slidably engages with the long groove 10 is formed on the outer wall of the stem 3. The movable contact portion 7 is composed of a rubber contact 5 having a movable contact fixed to the inner ceiling, and a dome-shaped support wall 6 that supports the rubber contact 5. In the conventional push button switch having such a structure, when the stem 3 is pressed, the support wall 6 bends and the rubber contact 5 descends. Become. Then, when the pressing is stopped, the support wall 6 returns to its original shape, and the rubber contact 5 and the fixed contact 8 which are in contact with each other are separated from each other, and the non-conductive state is established. Then, the hook 4 engages with the uppermost portion of the long groove 10 and the stem 3 stops. In this way, the engagement of the hook 4 and the long groove 10 prevents the stem 3 from coming off from 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 the stem 3 from rattling.

[0003]

In recent years, it has been desired to reduce the axial dimension (dimensions a, b, c in FIG. 5) of the stem as much as possible in response to the demand for light, thin, short and compact push button switches. Therefore, in order to reduce the thickness and size of the push button switch while ensuring the stroke of the stem, a push button switch as shown in FIG. 6 can be considered. This push-button switch has a housing 31 having a stem sliding hole 32 opened at one end thereof, and a stem 33 having a smaller diameter than the stem sliding hole 32 is slidably fitted into the stem sliding hole 32 at one end thereof. It is conceivable to provide the flange portion 33a and to provide one end of the housing 31 with a cover 34 that comes into contact with the end surface of the flange portion 33a of the stem 33 to prevent the stem 33 from coming off. However, in the case of the structure shown in FIG. 6, the stem 33 is prevented from coming off by the cover 34, but the thinned stem 33 comes into sliding contact with the sliding hole 32 only by the flange portion 33a thereof. The clearance between the housing 31 and the housing 31 tends to cause rattling of the stem 33, resulting in a poor electrical contact between the contacts 5 and 8. Further, when the stem 33 is pressed obliquely, it will return obliquely even when the stem 33 is restored, so that an unreasonable force is applied to the contact surface between the cover 34 and the protrusion that holds the cover 34, and the cover is covered. The cover 34 is disengaged and the stem 34 is easily separated from the housing 31 due to dimensional variation of 34 and the like. The present invention has been made in view of these problems, and it is possible to prevent the rattling of the stem in the stem sliding hole of the housing while keeping the push button switch thin and small, and to further secure the stem to the housing. It is an object of the present invention to provide a push button switch structure that can be reliably held in a stem sliding hole.

[0004]

[Means for Solving the Problems]

 In order to achieve this purpose, the push button switch of the present invention has a stem sliding hole at one end of the housing, a fixed contact is provided at the bottom of the stem sliding hole, and the fixed contact is opposed to the inside of the stem sliding hole. A movable contact is provided, and the stem is pushed into the stem sliding hole to abut the fixed contact.The stem is slidably fitted, and the side surface of the stem presses the movable contact. A concave groove extending to the other end and opening at the other end is formed, and a cover having an insertion hole for inserting the stem is provided at one end of the housing, and the hole is slidably engaged with the concave groove of the stem. A feature is that a convex portion is provided. Further, a vertical groove extending in the sliding direction of the stem is formed on the inner side surface of the housing, and a protrusion that slidably engages with the vertical groove is formed on the side surface of the one end of the stem. Characterize.

[0005]

[Action]

 According to the above configuration, since it is possible to secure a portion that makes sliding contact with the inner surface of the stem sliding hole of the housing over the entire length of the stem, the rattling of the stem is eliminated. The convex portion of the cover comes into contact with the end surface of the concave groove of the stem, so that the stem will not come off. Further, the vertical groove formed in the stem slide hole of the housing and the protrusion provided on the side surface of the one end of the stem are brought into sliding contact with each other to further prevent the rattling of the stem.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an assembled perspective view of a push button switch of the present invention. FIG. 2 is a sectional view of this push button switch. FIG. 3 is an exploded perspective view of this push button switch. The same components as those of the conventional push button switch described above are designated by the same reference numerals.

A push button switch according to an embodiment of the present invention is arranged in a box-shaped housing 11 having a stem sliding hole 11a and a stem sliding hole 11a of the housing 11 as shown in FIGS. A movable contact portion 7, a fixed contact 8 arranged at the bottom of the stem sliding hole 11a facing the movable contact portion 7, and fixed through the movable contact portion 7 in the stem sliding hole 11a. It is composed of a stem 13 arranged on the side opposite to the contact 8 and a cover 12 that covers the housing 11. The movable contact portion 7 is composed of 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. On the side surface of the stem 13, there are formed a plurality of concave grooves 13a extending from the vicinity of one end for pressing the rubber contact 5 to the other end and opening at the other end. Therefore, in this stem 13, ribs 13b extending from the vicinity of one end of the stem 13 to the other end are formed between the adjacent concave grooves 13a, and the outer peripheral end of each rib 13b and one end side surface of the stem 13. 13c is in sliding contact with the inner surface of the cylindrical stem sliding hole 11a. A claw portion 11b for locking the cover 12 is provided on the outer wall of the housing 11. The cover 12 has an insertion hole 14 through which the stem 13 is inserted, and the insertion hole 14 is formed with a convex portion 14 a that engages with the concave groove 13 a of the stem 13.

When the stem 13 is pressed in this push button switch, the rubber contact 5 approaches the fixed contact point 8, and when the stem 13 is further pressed, the support wall 6 bends to bring the rubber contact 5 and the fixed contact 8 into contact with each other. The electrical connection is established. During this time, the outer peripheral end of each rib 13b of the stem 13 and the one end side surface 13c are in sliding contact with the inner side wall of the stem sliding hole 11a, so that rattling of the stem 13 during movement is prevented. When the pressing of the stem 13 is stopped, the rubber contact 5 is separated from the fixed contact 8 by the restoring force of the rubber material of the rubber contact 7, and becomes non-conductive. At this time as well, as in the case of pressing, since the outer peripheral ends of the ribs 13b of the stem 13 and the one end side surface 13c are in sliding contact with the inner side wall of the stem sliding hole 11a of the housing 11, there is rattling during movement of the stem 13. Is prevented. The stem 13 is prevented from coming off from the stem sliding hole 11a by contacting the end 13d of each groove 13a with the protrusion 14a of the cover 12.

Therefore, in this embodiment of the present invention, there is no rattling even if the height of the stem 13 is made low to make the push button switch thin and compact, so that even if the stem 13 is axially oriented. Even if an oblique force is applied, the rubber contact 5 can surely contact the fixed contact 8 and the stem 13 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 designated by the same reference numerals and the description thereof will be omitted. In this embodiment, as shown in FIG. 4, a vertical groove 11c is formed on the inner side surface of the stem sliding hole 11a of the housing 11, and one end side surface 13c of the stem 13 has a protrusion 13e which engages with the vertical groove 11c. Are formed. Therefore, by engaging and sliding the protrusion 13e in the vertical groove 11c, it is possible to more reliably prevent rattling when the stem 13 slides. The push button switch of the present invention is not limited to the above-mentioned embodiment. The stem is not limited to the substantially columnar shape, but may be, for example, a prismatic shape. In this case, the number of concave grooves is not limited to four.

[0011]

[Effect of the device]

 Since the present invention is configured as described above, rattling does not occur even when the height of the stem is reduced, and there is no risk of electrical contact failure 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 thinning and miniaturization of the push button switch, prevention of rattling, and prevention of stem pull-out. Further, by engaging the vertical groove of the housing with the protrusion of the stem, the above-mentioned rattling prevention and stem removal prevention can be made more reliable.

[0012]

[Brief description of drawings]

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

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

FIG. 3 is an exploded perspective view showing an 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 showing a reference configuration example of a push button switch.

[Explanation of symbols]

 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 13d One End 13e Projection 14 Insertion Hole 14a Convex

Claims (2)

[Scope of utility model registration request] 1. A stem sliding hole that opens at one end of the housing is provided, and a fixed contact is provided at the bottom of the stem sliding hole.
Provide a movable contact facing the fixed contact in the stem sliding hole,
Pushing the movable contact into the stem sliding hole to bring it into contact with the fixed contact In a push button switch in which the stem is slidably fitted, press the movable contact to the side surface of the stem from the vicinity of one end of the stem to the other end of the stem. A concave groove that extends to the other end and is formed in the other end, and a cover having an insertion hole through which the stem is inserted is provided at one end of the housing, and a convex portion that slidably engages with the concave groove of the stem is provided in the hole. Push button switch characterized by having. 2. A vertical groove that extends in the sliding direction of the stem is formed on the inner surface of the housing, and a protrusion that slidably engages with the vertical groove is formed on the side surface of the one end of the stem. Push button switch described in 1.