JPH10302569A - Push switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a push switch equipped with a moving contact mechanism of a slide structure excellent in reliability against arc discharge. SOLUTION: A slider 5 contained in a containing space 4 is equipped with a lift piece 53 lifting up first moving contact 5 from first fixed contact plate 32. The lift piece 53 is provide nearer a base end portion 54 comparing with the first moving contact 51. Therefore, a drop when the first moving contact 51 collides with the first fixed contact plate 32 is larger comparing with a drop when the lift piece 53 falls from a protrusion 34, and the first moving contact 51 collides with the first fixed contact plate 32 in great force so that the occurrence time of arc discharge is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push switch suitable for a reverse detection switch, a neutral detection switch, and the like used in an automobile, and more particularly, to a push switch having a slide structure with high reliability against arc discharge. It relates to a push switch.

[0002]

2. Description of the Related Art A conventional push switch having a movable contact mechanism having a slide structure is disclosed in, for example, Japanese Utility Model Application Laid-Open No. 58-1170.
There is one disclosed in Japanese Patent Publication No. 29-29. In this conventional push switch, a rod and a base are respectively provided at one end and the other end of a cylindrical housing, a slider is stored in a storage space formed by the housing and the base, and two fixed contact plates are provided on an inner wall of the base. And the slider has movable contacts at both ends corresponding to the respective fixed contact plates. Then, when the slider is displaced together with the rod, each movable contact at both ends of the slider slides on the inner wall of the base in the OFF region, and slides on the fixed contact plate in the ON region.

[0003]

However, in the case where the above-mentioned conventional push switch detects that the gear has been operated to the reverse position and turns on the reverse lamp of the vehicle, a large lamp current is applied to each movable contact. When each movable contact shifts from the inner wall of the base to the fixed contact plate, and when it shifts from the fixed contact plate to the inner wall of the base, it moves between each movable contact and the fixed contact plate. An arc discharge was generated, and the arc discharge burned the inner wall of the base, particularly the boundary portion with the fixed contact plate, and produced an insulator, which sometimes caused a contact failure.

The present invention solves the above-mentioned problem and, of course, provides the first movable contact as compared with the degree of drop when the lifting piece falls from the projection by providing the lifting piece near the base end of the slider. The object of the present invention is to provide a push switch in which the degree of drop when colliding with the first fixed contact plate is increased. In addition, another object is to provide a push switch having a characteristic function according to each claim.

[0005]

In order to solve the above problems, according to the first aspect of the present invention, a rod and a base are provided at one end and the other end of a cylindrical housing, respectively, and a housing formed by the housing and the base is provided. A push switch in which a slider is housed in a space and first and second fixed contact plates are provided on an inner wall of the base, and a slider displaced together with a rod slides on the fixed contact plate to operate a switch. A slider has first and second movable contacts corresponding to the first and second fixed contact plates, has a lifting piece near the first movable contact, and the base has a projection on an inner wall. The lifting piece falls from the projection in the process of displacing the slider, so that the first
And a push switch in which the movable contact of the first switch contacts and electrically contacts the first fixed contact plate.

According to a second aspect of the present invention, there is provided a push switch having the lifting piece between a first movable contact and a base end of a slider.

According to a third aspect of the present invention, there is provided a push switch having the lifting piece on the left and right of the first movable contact.

According to a fourth aspect of the present invention, there is provided a push switch in which the second movable contact always slides in contact with the second fixed contact plate.

According to a fifth aspect of the present invention, the first movable contact is formed of a chip-shaped contact material joined to one end of a slider, and the second movable contact is formed by bending the other end of the slider. A push switch comprising a formed portion is provided.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The push switches shown in this embodiment are a reverse detection switch and a neutral detection switch which are used by being mounted on a transmission case of an automobile. In addition, we are trying to prevent the assembly of different products and reduce costs. The transmission case houses a plurality of fork shafts for operating a control lever provided in the driver's seat to select the engagement of the transmission and determine the shift position.
A hole facing the fork shaft is provided on an outer wall of the transmission case, and a push switch described below is mounted in this hole to perform reverse detection and neutral detection.

An embodiment will be described below with reference to the accompanying drawings. Reference numeral 1 in the drawing denotes a housing. This housing 1
Is a metal part formed in a cylindrical shape, a screw thread 12 for fastening to a hole of the transmission case is formed at one end 11, and a hole 13 for mounting the rod 2 at the center of the one end 11. Has formed. A caulking portion 15 for fixing the base 3 is provided at the other end 14 of the housing 1.
Is formed.

Next, the rod 2 will be described. This rod 2
Is a part whose main body is formed of a synthetic resin,
Is formed so as to protrude from the hole 13 of the housing 1 so as to be able to engage with the fork shaft of the transmission case, and a packing 23 made of synthetic rubber different from the material of the rod 2 body is integrally bonded to the base end portion 22. doing. The packing 23 is provided to dampen the oil of the transmission case that enters the housing 1 through the hole 13.

Next, the base 3 will be described. This base 3
Is a component molded from a synthetic resin, and the first and second fixed contact plates 32, 33 are insert-molded so as to be flush with the surface of the inner wall 31. On the side of the inner wall 31 where the first fixed contact plate 32 is provided, a projection 34 on which a lifting piece 53 of the slider 5 described later rides is formed. Further, a support 35 for supporting the spring 6 is formed at the center of the inner wall 31. Further, a connector housing 36 is formed outside the base 3, and the first and second fixed contact plates 32 and 33 are provided on the connector housing 36.
Project from each end to form a terminal 37. The base 3 is combined with the housing 1 to form a storage space 4 in which a slider 5 and the like described below are stored.

Next, the slider 5 will be described. The slider 5 is formed by processing a metal plate made of a material such as beryllium-copper alloy having a spring property. As shown in FIGS. 1 to 3, the slider 5 is formed on the first and second fixed contact plates 32 and 33. Corresponding first and second movable contacts 51 and 52 are formed, and a pair of lifting pieces 53 are formed on the left and right near the first movable contact 51. The first movable contact 51 is a contact made of a chip-shaped contact material joined to one end of the slider 5, and the second movable contact 52 is a contact formed by bending the other end of the slider 5. It is. The slider 5 has a hole 55 in the center of the base end portion 54 for fitting a column 72 of the holder 7 described later.

When the slider 5 is displaced in the axial direction together with the rod 2, the lifting piece 53 lifts the first movable contact 51 by riding on the projection 34 of the base 3 in the displacement process. This is a structure provided in order to cause the first movable contact 51 to collide with the first fixed contact plate 32 by dropping from the contact. This lifting piece 53
Is formed between the first movable contact 51 and the base end portion 54. That is, as shown in FIG. 1, the distance L2 from the base end 54 to the first movable contact 51 is longer than the distance L1 from the base end 54 to the lifting piece 53. Therefore, the drop when the first movable contact 51 collides with the first fixed contact plate 32 is larger than the drop when the lifting piece 53 falls from the projection 34, and the first movable contact 51 is The first fixed contact plate 32 vigorously collides with the first fixed contact plate 32, so that the time required for arc discharge is reduced, and even if foreign matter adheres to the surface of the first fixed contact plate 32, the first movable contact 51
Can be expected to be eliminated by the momentum. Furthermore, the position where the first movable contact 51 collides with the first fixed contact plate 32 is constant. Note that the second movable contact 52 is
And always slides in contact with the fixed contact plate 33. Further, the first movable contact 51 is provided on the inner wall 31 made of synthetic resin.
Is a structure that does not contact at all.

Next, the holder 7 will be described. This holder 7
Is a part formed of a synthetic resin for supporting the slider 5, and a head 71 fitted to the packing 23.
A support 72 on which the slider 5 and the spring 6 are mounted; and a guide 73 for guiding the holder 7 along the inner wall 31 of the base 3.
And

The push switch shown in this embodiment is assembled, for example, in the following order. First, one end of the spring 6 is fitted to the support 35 of the base 3, then the other end of the spring 6 is fitted to the support 72 of the holder 7 on which the slider 5 is mounted, and then the head 71 of the holder 7 is attached to the rod 2. To the packing 23 of
Next, the distal end 21 of the rod 2 is inserted into the hole 13 of the housing 1, and finally, the caulking portion 15 of the housing 1 is caulked all around the circumference, so that the housing 1 is assembled to the base 3. At this time, the slider 5, the holder 7, and the rod 2 are maintained in a mutually connected state by the repulsive force of the spring 6. Further, when the housing 1 and the base 3 are combined, the outer periphery 24 of the packing 23 is sandwiched between the two as shown in FIG. 1 to form an oil seal structure.

Next, the operation when the above-described push switch is used, for example, for reverse detection will be described. In this case, the push switch screws the thread 12 of the housing 1 into the hole facing the reverse fork shaft, and connects the terminal 37 to the female terminal provided between the electric wire connecting the back lamp of the automobile and the battery. As a result of this connection configuration, when the reverse fork shaft is operated by operating the control lever in the driver's seat to the reverse position, the reverse fork shaft is
Is pushed in the direction of arrow A shown in FIG. Then
The slider 5 is displaced to the ON position indicated by the imaginary line in FIG. 1, and the lifting piece 53 of the slider 5 falls from the projection 34, so that the first movable contact 51 collides with the first fixed contact plate 32. The two lamps come into electrical contact with each other, and the backlight is lit by supplying power from the battery to the back lamp.

Next, when the control lever is operated to another position, the reverse fork shaft returns to another position, and the force pushing the distal end portion 21 of the rod 2 in the direction of arrow A is released. Then, the slider 5 returns to the OFF position indicated by the solid line in FIG. 1 due to the repulsive force of the spring 6, the lifting piece 53 rides on the projection 34, and accordingly, the first movable contact 51 moves from the first fixed contact plate 32. Then, the power supply to the back lamp is cut off and the back lamp is turned off.

The push switch according to the present invention comprises:
Various applications other than the reverse detection switch and the neutral detection switch used for automobiles are possible, and the structure can be variously modified without departing from the gist of the present invention.

[0021]

According to the present invention, a rod and a base are provided at one end and the other end of a cylindrical housing, respectively, and a slider is stored in a storage space formed by the housing and the base.
A push switch in which first and second fixed contact plates are provided on an inner wall of the base, and a slider displaced together with a rod slides on the fixed contact plate to perform a switch operation, wherein the slider includes the first and second fixed contact plates. A first movable contact corresponding to the second fixed contact plate, a lifting piece near the first movable contact, the base having a protrusion on an inner wall, and the lifting piece being Since the first movable contact collides with the first fixed contact plate and is electrically contacted with the first fixed contact plate by dropping from the projection in the process of displacing the slider, the slide structure has high reliability against arc discharge. The movable contact mechanism described above can be provided, and can be commonly used for a reverse detection switch used for an automobile, a neutral detection switch, and the like.

The invention according to claim 2 is a push switch having the lifting piece between the first movable contact and the base end of the slider. The degree of drop when the first movable contact collides with the first fixed contact plate is larger than the degree of fall when the lifting piece provided on the first object falls from the projection, and the first movable contact is in contact with the first movable contact. Collides vigorously with the fixed contact plate, thereby shortening the time required for arc discharge. Even if foreign matter adheres to the surface of the first fixed contact plate, the first
Can be expected to be eliminated by the momentum of the movable contact.

According to the third aspect of the present invention, since the push switch has the lifting pieces on the left and right sides of the first movable contact, in addition to the above-mentioned effect, the force required to lift the first movable contact is reduced by two. Each lifting piece can be shared, and the burden is less than that of a single lifting piece, and the lifting piece does not deform for a long period of time. Also,
As compared with the case where one lifting piece is provided on one side, no torsional stress is applied to the slide, and the operation of the slider is stabilized.

According to a fourth aspect of the present invention, the second movable contact is a push switch which is always in contact with and slides on the second fixed contact plate. It can be generated only at one movable contact, and it is not necessary to consider durability against arc discharge for the second movable contact, and the cost of the slider can be reduced.

According to a fifth aspect of the present invention, the first movable contact is made of a chip-shaped contact material joined to one end of a slider, and the second movable contact is formed by bending the other end of the slider. Since the push switch is formed of the formed portion, in addition to the above-described effects, the amount of expensive chip-shaped contact material used is reduced, and the cost of the slider can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an exploded view of what is shown in FIG.

FIG. 3 is an explanatory view of a slider 5 shown in FIG. 1;
Is a top view seen from the direction indicated by arrow B in (c),
(B) is a side view seen from the direction shown by arrow C in (c), and (c) is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Rod 3 Base 4 Storage space 5 Slider 6 Spring 7 Holder

Claims (5)

[Claims] 1. One end (11) of a cylindrical housing (1).
And a rod (2) and a base (3) at the other end (14), respectively, and a slider (5) is stored in a storage space (4) formed by the housing (1) and the base (3). First and second fixed contact plates (32, 33) are provided on the inner wall (31) of (3), and a slider (5) displaced together with the rod (2) moves on the fixed contact plates (32, 33). In a push switch slid and operated by a switch, the slider (5) includes first and second movable contacts (5) corresponding to the first and second fixed contact plates (32, 33).
1, 52) and a first movable contact (51).
The base (3) has a projection (34) on an inner wall (31), and the lifting piece (53) has a projection in the process of displacing the slider (5). By falling from (34), the first
A push switch in which the movable contact (51) of the above (1) collides with and electrically contacts the first fixed contact plate (32). 2. The push switch according to claim 1, wherein the lifting piece (53) is provided between the first movable contact (51) and a base end (54) of the slider (5). 3. The push switch according to claim 1, wherein the lifting piece (53) is provided on the left and right sides of the first movable contact (51). 4. The push switch according to claim 1, 2 or 3, wherein the second movable contact (52) always comes into contact with the second fixed contact plate (33) and slides. 5. The invention according to claim 1, wherein the first movable contact (51) is made of a chip-shaped contact material joined to one end of a slider (5), and Wherein the movable contact (52) is formed by bending the other end of the slider (5).