JPH0615372Y2 - Push-type switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a push-type switch which is mainly attached to the outside of a vehicle and is used to detect an operating state of an accessory.

(Prior Art) Conventionally, this type of switch is attached to the outside of the vehicle body, so that water and mud are likely to adhere to it, and the contact is opened and closed by advancing and retracting the shaft. Water, etc., easily infiltrate into the water.
As described in No. 3442, by covering the shaft with a bellows boot that expands and contracts in accordance with the advance / retreat of the shaft, and by separating the sliding part of the shaft from the outside, invasion of moisture or the like to the contact side can be achieved. It is general to prevent this.

(Problems to be solved by the invention) In the above-mentioned conventional switch, moisture or the like enters from the joint portion between the bellows boot and the shaft with the hardening of the bellows boot or the expansion and contraction of the bellows boot under bad conditions. Moreover, due to the breathing action on the contact side due to the expansion and contraction of the bellows boot, water or the like that has entered the boot may enter the contact side through the sliding portion of the shaft.

In order to solve the above problems, the present invention provides a push-type switch in which the inside of the bellows boot is opened to the atmosphere and the contact side is closed by a seal member to prevent moisture and the like from entering the contact side. Is its purpose.

(Means for Solving the Problems) A switch case accommodating a fixed contact, a shaft protruding from the switch case by attaching a movable contact for opening and closing the fixed contact, and a protruding portion of the shaft fixed to the switch case In a push-type switch composed of a bellows boot that covers, a seal member through which the shaft is inserted is provided in a shaft insertion hole inside the fixed side of the bellows boot, and the movable end of the bellows boot is bent. It is characterized by having a breathing hole.

(Function) The switch is opened and closed by the forward movement of the shaft and the backward movement of the contact.

The bellows boots on the shaft prevent water from adhering to the shaft even if it gets wet. Further, even if water or mud enters the bellows boot through the breathing hole due to the breathing action associated with the advancing / retreating action of the shaft, since the breathing hole is bent, it adheres to the breathing hole and its vicinity. Not reach far,
The air released when the bellows boot (14) contracts is easily discharged to the outside. On the other hand, since the sliding portion is closed by the seal member provided at the shaft insertion port, moisture or the like does not enter the contact side.

(Example) A case where the present invention is used for detecting attachment / detachment of a side stand of a motorcycle will be described.

Referring to FIGS. 1 to 4, (1) is a switch case,
(2) shows a shaft which is inserted into the switch case (1) so as to be movable back and forth.

The switch case (1) has an oil seal (3), which is a seal member having the shaft (2) inserted at its front end, embedded in the switch case.
A closed chamber (5) is formed in the switch case (1) by a substrate (4) that partitions the switch case (1), and the shutter (2) is provided at the front end of the closed chamber (5). Connect and return spring at rear end (6)
Is provided with a contact holder (7) that is movable back and forth by pressing, and by a stopper (8) provided at the rear end of the contact holder (7),
The spring resonance of the return spring (6) is prevented, and the shaft
Limit the stroke in (2).

The contact holder (7) has a guide protrusion (7a) provided upright therein, and the guide protrusion (7a) has a coil spring on its upper surface.
(9) is interposed, the recess formed in the lower surface of the movable contact (10) is fitted, and the movable contact (10) is connected to the coil spring (9).
It is repulsed upward by the movable contact as shown in FIG.
(10) a pair of contact protrusions (10a) provided on the upper end of (10a), a pair of fixed terminals provided so as to be located immediately above each contact protrusion (10a) at the forward position of the shaft (2) ( 11) Abut (11),
I tried to close the contacts.

Further, the substrate (4) has a lower surface serving as a sliding surface of the contact protrusion (10a), and a pair of connection cords (12) and (12) led from a display are provided on the upper surface thereof to extend the respective The tip of the connection cord (12) is connected to the upper end of each fixed terminal (11) protruding from the substrate (4) to take out a signal to the display, and the upper surface of the substrate (4) is An epoxy filling material (13) was filled for the purpose of insulating the connection portion between the connection cord (12) and the fixed terminal (11) and fixing each connection cord (12).

The shaft (2) abuts the front end on the side stand of the motorcycle, and moves the movable contact (10) provided on the contact holder (7) forward and backward according to the standing and retracting operation of the side stand to form the fixed contact (11). The position of the side stand is detected by opening and closing between them.

In addition, the front end of the exposed portion of the shaft (2) is the shaft (2).
The bellows boot (14) is fitted into the flange (2a) provided at the front end of the, and the rear end is fitted into the fitting groove (1a) provided at the front of the switch case (1). 14) expands and contracts following the forward / backward movement of the shaft (2), and provides a bent breathing hole (14a) on the front end surface of the bellows boot (14), that is, the movable side end, so that the bellows boot (14) ) A breathing chamber (15) open to the atmosphere is formed inside, and the breathing chamber (15) performs a breathing action with the outside as the bellows boot (14) expands and contracts.

As shown in FIG. 5, the bellows boot (14) can reduce the stress in the bent portion by forming the top and the bottom of the surface of the boot to be thin.

As described above, according to the above embodiment, when the side stand is erected, the shaft (2) moves forward and closes the contacts, and sends a signal to the display.When the side stand is stored, the shaft (2) is retracted. The contact is opened and the signal is cut off, and the posture of the side stand can be detected.

Also, the bellows boot (14) has a bent breathing hole (14
By providing a) to the breathing chamber (15) that is open to the atmosphere, even if water or mud may enter the bellows boot (14), it bends and flows in as shown by arrow A. Therefore, the direction of water, mud, etc. is changed or diminished, and most of it adheres to the inside of the breathing hole and its vicinity, does not reach the seal (3) side, and is released when the bellows boot (14) contracts. It is easy to be discharged to the outside by the air. In addition, since the swirl flow is formed by the inner surface of the bellows boot (14) at the time of inflow, and the flow force is reduced, the above-mentioned depressing action is further promoted. Further, by providing an oil seal to seal the movable contact (10) in the closed chamber (5), even if the movable contact (10) advances and retracts, the bellows boot (14)
Is not affected by the breathing action of, and moisture does not enter the contact side.

(Effect of the Invention) According to the present invention as described above, since the bellows boot is provided with the breathing hole, even if the shaft has a long stroke, the shaft can smoothly move back and forth due to its breathing action, and water, mud, etc. Even if air is inhaled, there are few things that are weakened by the bent breathing hole and reach the seal side, and are easily discharged to the outside together with the air released when the bellows boot contracts. Further, the seal member has an effect that moisture and the like can be prevented from entering the contact side, and the waterproof property can be remarkably improved.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention, which is a side view of cutting when the shaft is advanced, FIG. 2 is a side view of cutting when the shaft is retracted, FIG. 3 is a plan view, and FIG. 4 is FIG. 5 is a sectional side view of the bellows boot in which the top and the valley bottom are thinly formed. (1) …… Switch case, (2) …… Shaft (3) …… Oil seal, (5) …… Closed chamber (10) …… Movable contact, (11) …… Fixed contact (14) …… Velvet Boots, (14a) …… Breathing hole (15) …… Breathing chamber

Claims (1)

[Scope of utility model registration request] 1. A switch case containing a fixed contact, a shaft protruding from the switch case by mounting a movable contact for opening and closing the fixed contact, and a bellows boot fixed to the switch case and covering a protruding portion of the shaft. In the push-type switch, a seal member through which the shaft is inserted is provided in a shaft insertion port inside the fixed side of the bellows boot, and a movable side end of the bellows boot is provided.
A push-type switch characterized by a bent breathing hole.