JPH067547Y2 - Push switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a push-type switch suitable for a vehicle stop lamp switch or the like.

[Prior Art] FIG. 6 shows an example of a conventional stop lamp switch.
This switch accommodates a shaft b in a cylindrical resin case a having a bottom, one end of which protrudes outward from the bottom of the case a to form a pressing portion, and a conductor is provided around the shaft b in the case a. A movable contact c formed by winding a plate is formed.

On the other hand, a base d that allows the shaft b to move back and forth is fitted and fixed in the center of the opening of the case a, extends from the base d toward the bottom of the case a, and has a fixed contact e slidable with the movable contact c. Is installed. Further, return springs f whose ends are respectively supported are compressed and arranged between the shaft b and the base d, and urge the pressing portion against the shaft b to go out of the case a. Reference numeral g is a drain hole opened on the side surface.

Normally, the shaft b is pushed in by the end of a brake lever (not shown), the movable contact c moves against the return spring f, and the fixed contact e does not come into contact with the movable contact c to switch off. When the pressing of the shaft b is released by the operation of the lever, the movable contact c comes into contact with the fixed contact e and the switch is turned on. Note that the side surface of the case a discharges water that has intruded inward along the shaft b. It is common to provide a drain hole g for this purpose.

[Problems to be Solved by the Invention] By the way, since the water drain hole g of the above structure is always open, not only the water in the interior is discharged, but also water may enter from the outside.

Therefore, an object of the present invention is to provide a push-type switch that closes the drain hole when the switch is in a normal state. In the normal state, for example, in the case of a backlight switch, the switch is set to either on or off when the brake is not operated.

[Means for Solving the Problems] In order to solve the above problems, a push-type switch according to the present invention has a drain hole formed on a side surface of a case, and
It is characterized in that the slider is positioned so as to close the water drain hole in a normal state.

[Operation of device] When the switch is in the normal state, the slider is located on the drain hole on the side surface of the case and closes it from the inside of the case. Therefore, water from the outside cannot enter the inside through the drain hole.

[Embodiment] FIGS. 1 to 4 show an embodiment configured as a vehicle stop lamp switch. This switch has a bottomed cylindrical case 10 having one end opened, a slider assembly 20 slidably accommodated in the case, a base assembly 30 fitted and fixed in an opening of the case 10, and a slider assembly 2.
0 and the base assembly 30 are arranged in a compressed state by a coiled return spring 40 and the like.

The case 10 is made of insulating and waterproof resin, and has a bottom portion 1
1 has a small hole 12 formed therein. Further, a drainage hole 13 is formed on a side portion of the case 10 slightly near the bottom portion 11, and an engaging hole 15 is further formed on a side portion near the opening portion 14.
A pair of thin portions 16 are formed on the inner surface of the case 10 so as to face the bottom portion 11 from an opening portion 14 for fitting a fixed contact plate described later.

The slider assembly 20 includes a slider 21 made of resin and a movable contact 22 made of a conductor. The slider 21 has one end as a pressing portion 23 projecting outward from the small hole 12, a boss portion 24 extending in a direction opposite to the pressing portion 23, and a cover portion formed of an annular wall portion around the boss portion 24. 25, and a recess 26 is formed between the boss 24 and the cover 25. On the other hand, the movable contact 22 forms a curved free end 27 a at the tips of the pair of arm portions 27, and both arm portions 2
A through hole 29 of the boss portion 24 is formed in the connecting portion 28 between the seven. The movable contact 22 is supported on the slider 21 side by passing the boss portion 24 into the through hole 29 of the connecting portion 28.

The base assembly 30 has a resin base 31 of a size that can be fitted into the opening 14 of the case 10, forms a boss 32 in the center of the side surface on the inner side of the case, and surrounds it with the inner diameter of the case 10. A recess 34 is formed between the boss 32 and the insulating portion 33 while being surrounded by an insulating portion 33 formed of an annular wall portion having an outer diameter substantially matching the above. Further, a fixed contact plate 35 is attached around the insulating portion 33, and a step l (see FIG. 4) is formed between the fixed contact plate 35 and the tip of the insulating portion 33. One end of the fixed contact plate 35 extends toward the inside of the case 10, and the thickness of the fixed contact plate 35 is equal to that of the case 10.
The thickness difference between the thin-walled portion 16 and the thick-walled portion formed on the bottom portion 11 side is approximately the same,
It is constructed so that it can be fitted onto the thin portion 16 of 0, and the cover portion 25 of the slider 21 slides on the surface thereof. In addition, the fixed contact plate 35 has a cutout 36.
Are integrated by engaging a recess 37 formed around the base 31. However, the fixed contact plate 35
It is also possible to integrate into the base 31 by insert molding. Further, an engaging protrusion 30a that engages with the engaging hole 15 of the case 10 is formed on the side surface of the base 31 so as to project (see FIG. 2).

Both ends of the return spring 40 are attached to the boss portion 24 and the boss 32, and the base 31 is fitted into the case 10 and then fixedly engaged therewith.
0 urges the slider 21 toward the bottom portion 11, and the pressing portion 23 always projects outward from the small hole 12. The other end of the fixed contact plate 35 extends outside the case 10 to form a connection terminal 38, and is housed in the coupler 50. An engagement hole 39 is formed in the middle portion of the connection terminal 38.

The coupler 50 is formed by fitting a female terminal 51 into a resin body. The female terminal 51 is formed with an engagement protrusion 52 that engages with the engagement hole 39, and the end portion is formed by a caulking portion 53. A cord 54 is connected. When the coupler 50 is pushed toward the base 31 so as to fit the connection terminal 38 into the female terminal 51, the engagement projection 52 engages with the engagement hole 39 to integrate the base assembly 30 and the coupler 50. .

To assemble this switch, as shown in FIG. 3, first, the slider assembly 20 and the base assembly 30 are respectively sub-assembled, and the slider assembly 20 in which one end of the return spring 40 is supported by the boss portion 24 is inserted into the case 10. It is accommodated and the pressing portion 23 is projected outward from the small hole 12.

Next, the base assembly 30 is attached to the opening 14 side of the case 10.
, The fixed contact plate 35 is fitted along the surface of the thin portion 16, and the engaging projection 30a is fitted in the engaging hole 15, so that the base 31 is fixed to the opening 14 of the case 10. It At this time, the return spring 40
The other end of the movable contact 2 is compressed because it engages with the boss 32 and is pushed inward by the base 31.
2 to contact the connecting portion 28 to move the movable contact 22 to the slider 2
It is pressed and fixed in the recess 26 of No. 1.

Next, a method of operating the stop lamp switch of this embodiment will be described. FIG. 1 shows a switch-on state in which the free end 27a of the arm portion 27 contacts the fixed contact plate 35,
This state corresponds to the braking operation. At this time, the pressing portion 23 is in an open state in which no force is applied.

When the brake is returned, a force is applied to the pressing portion 23 by a brake lever or the like (not shown), and the slider assembly 20 moves to the right in the figure against the return spring 40. Eventually, when the free end 27a rides on the insulating portion 33, the free end 27a comes out of contact with the fixed contact plate 35 and is switched off. This state is a normal state in which the brake is not activated.

4 and 5 are views showing the relationship between the water drain hole 13 and the cover portion 25 in the normal state (switch off). In this state, the cover portion 25 is moved to a position covering the water drain hole 13. Therefore, the drain hole 13 is closed from the inside of the case 10. Therefore, water from the outside cannot enter the case 10 through the water drain hole 13, and the waterproofness of the arm portion 27 and the fixed contact plate 35 is improved.

In the switch-on state, as shown in FIG.
Moves to the left in the figure to open the water drain hole 13, but this opening time occupies only a small proportion in a general use state, so there is not much problem in terms of waterproof performance. Also,
Water that has entered the case 10 from the small hole 12 side is discharged when the water drain hole 13 is opened.

Contrary to the present embodiment, when the normal state is the switch-on state, the one in which the position of the drain hole 13 is set in advance so that the cover portion 25 can close the switch in this state is manufactured. Good.

[Advantage of the Invention] According to the present invention, since the water drain hole is closed by the slider in a normal state, it is possible to prevent water from entering the case from the outside through the water drain hole. Therefore, the waterproof performance of the push-type switch can be improved.

[Brief description of drawings]

1 to 6 show an embodiment, FIG. 1 is an external development view, FIGS. 2 and 3 are development views shown in cross section, FIG. 4 is a cross-sectional view of an essential part, and FIG. FIG. 5 is a partial cross-sectional view taken along the line VV of FIG. 4. FIG. 6 is a sectional view of a conventional example. (Explanation of reference numerals) 10 ... Case, 13 ... Drainage hole, 20 ... Slider assembly, 21 ... Slider, 22 ... Movable contact, 25 ... Cover part, 30 ... Base assembly, 35 ... Fixed contact plate, 4
0 ... Return spring.

Claims (1)

[Scope of utility model registration request] 1. A case having a bottomed tubular shape with one end opened, a slider slidably accommodated in the case and having a pressing portion protruding outward from the bottom of the case, and a movable contact attached to the slider. A base fitted and fixed in the opening of the case, and a fixed contact extending from the base side to the slider side along the inner surface of the case so that the movable contact can slide.
A return spring arranged between the slider and the base and urging the slider in the protruding direction of the pressing portion, wherein a drain hole is formed on the side surface of the case, and in a normal state, A push-type switch characterized in that the slider is positioned so as to close the drain hole.