JPS5843142Y2 - door switch - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement in a door switch.

Conventionally, as a door switch used for blinking control of a door lamp linked to the opening and closing of a door of a car, etc., a door button 1 made of synthetic resin having an operation button part 1a and a guide shaft part 1b, as shown in FIG. 1, has been conventionally used. The switch case 2 for holding the door button 1 is provided with a guide cylinder part 3 having a large-diameter collar part 3a at the upper end and slidably fitting the operation button part 1a and the guide shaft part 1b. The operation button part 1a, which is biased upward by a coil spring 4 housed in the guide cylinder part 3, is pressed against the lower surface of the guide cylinder part 3 with a contact 5 screwed to the guide shaft part 1b with a screw 5a. The guide cylinder part 3 is stopped so as to be turned on when the door button 1 is pushed down and the contact 5 is released from the guide cylinder part 3. After the switch is inserted into the mounting hole 6a of the switch mounting plate 6, the shank portion 3a is fixed to the tapped hole 6b of the switch mounting plate 6 with a screw 7b via a washer 7a.

However, with this configuration, the washer 7a and the screw 7b
This has the disadvantage that it requires several parts, and the additional man-hours required to screw and fasten them makes assembly work cumbersome and increases costs.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and provides a door switch that can be reliably mounted simply by inserting it into the mounting hole of the switch mounting plate.

Hereinafter, embodiments of this invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 to 4, the door switch has a large-diameter operation button 10a with a hemispherical tip, and a small-diameter contact switching shaft portion 10b integrated with the operation button 10a. A door button 10 made of resin (insulating) is provided.

The contact switching shaft portion 10b of the door button 10 has the other end 11 of the contact shaft 11, which has approximately the same outer diameter as the contact switching shaft portion 10b and has four contact portions 11a formed at one end that can contact a contact terminal (not shown). It is installed integrally by inserting b.

On the other hand, a switch case 1 that holds the door button 10 is
2, a large diameter collar part 1 is formed at the upper end by press drawing.
3, and the operation button part 10a of the door button 10 is slidably fitted into the guide cylinder part 14.

The lower end of the guide tube portion 14 is narrowed inward, and the center portion is curved downward into quarters to form a contact piece 15a.

. . . , a guide contact portion 15 is formed as 15a,
The contact shaft 11 and the contact switching shaft portion 10b of the door button 10 are alternately fitted into the guide contact portion 15 in contact with each other.

That is, when the door button 10 is pushed up, the contact shaft 11 contacts the contact pieces 15a, . , . . . , the switch can be switched off by touching 15a.

Note that if a groove 16 is provided at the boundary between the contact switching shaft portion 10b and the contact shaft 11 of the door button 10 to form an air gap, metal scum and the like caused by arcing during contact switching can be discharged.

At the upper end of the guide tube part 14, there are four places around the outer circumference with small widths.
A short piece is punched out inward to prevent removal, 17a...
. . , a removal stop part 17 is formed as 17a, and the outer layer 10C of the operation button part 10a, which is biased upward by the coil spring 18 compressed in the guide tube part 14, is pressed against it, and the stop part 17 is made to stop at the corresponding position. In this case, the contact shaft 11 is the contact piece 15a,
..., comes into contact with 15a and turns on.

``The circumference of the guide tube part 14 is cut and raised in two symmetrical places around the outer circumference in a small width from the lower end to the end, and the tip is bent inward in a roughly F-shape and cut and raised. A cut-and-raised piece 19 is formed which opens outward by spring force when the guide cylinder part 14 is inserted into the mounting hole 20a of the switch mounting plate 20.
The tips of the guide tubes 19a and 19a abut against the inner peripheral edge of the mounting hole 20a to lock the guide cylinder 14 with the collar 13 via the switch mounting plate 20.

If the door switch has the above-described structure, the coil spring 18 is compressed into the guide cylinder part 14 of the switch case 12, and the operation button part is inserted while the contact shaft 11 is fitted into the guide contact part 15. 10a into the guide cylinder part 14,
The operation button section 10a is prevented from being removed using the removal stopper 17 and then assembled.

Then, when the guide cylinder part 14 of the switch case 12 is inserted into the mounting hole 20a of the switch mounting plate 20, the cut and raised pieces 19a, 19a open outward due to the force of the spring, and the flange part is inserted through the switch mounting plate 20. The guide cylinder part 14 is locked between the guide cylinder part 13 and the switch mounting plate 20 so as to be non-removably mounted thereon.

In the above embodiment, the contact shaft 1 is attached to the contact switching shaft portion 10b.
As shown in FIG.
The door button 23 may be configured as an integrated door button 23.

As is clear from the above description, this invention provides a switch case that holds a door button integrally provided with contact shirts 1 to 3, a guide tube portion having a collar portion, a guide contact portion, a pull-out stop portion, and a switch case that holds a door button. When the guide cylinder part of the switch case is inserted into the mounting hole of the switch mounting plate, the guide cylinder part is locked to the switch mounting plate by the collar part and the locking part, and the switch is configured with a locking part. Since the case is attached to the switch mounting plate, there are no washers or screws like the conventional ones mentioned above.
This also eliminates the need for assembling man-hours, making it possible to greatly simplify the structure.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a conventional door switch, FIG. 2 is a vertical sectional view of a door switch according to this invention, FIG. 3 is a bottom view of FIG. 2, and FIG. 4 is a plan view of FIG. 2. FIG. 5 is a sectional view of a main part showing a modification of the contact shaft. 10.23...Door button, 10a...
・Operation button part, 10b...Contact switching shaft part, 1
1...Contact shaft, 12...Switch case, 13...Brim part, 14...
Guide cylinder part, 15... Guide contact part, 15 a...
...Contact piece, 17...Removal stop part, 17a
...Removal stop piece, 18...Coil spring, 19...Locking part, 19 a...Cut-up part, 20...・Switch mounting plate, 20a
...Mounting hole, 21...Contact sleeve.

Claims (1)

[Scope of Claim for Utility Model Registration] A door button made of synthetic resin having a large-diameter operation button part and a small-diameter contact switching shaft part is provided, and the contact switching shaft part of the door button is approximately the same as the contact switching shaft part. A contact shaft with the same outer diameter is provided integrally in the axial direction, and a guide tube, which serves as a switch case for holding the door button, has a large diameter collar at the upper end and into which the operation button part is slidably fitted. A lower end of the guide tube is squeezed to form a contact piece, and the contact shaft and the contact switching shaft are placed in a switch-on position where the contact shaft contacts the contact piece, and a switch-on position where the contact switching shaft contacts the contact piece. a guide contact portion that guides the switch to the switch-off position; and the upper end of the guide tube portion is punched out inward to serve as a stopper for removal, and the above operation is biased upward by a spring stored in the guide tube portion. A removal stop part that holds the button part in place in the switch-on position; A part of the outer periphery of the guide cylinder part is cut and raised outward to form a cut-and-raise piece, and the guide cylinder part is inserted into the mounting hole of the switch mounting plate. A door switch characterized in that the cut-and-raised piece is provided with a locking portion that locks the guide tube portion with the collar portion via the switch mounting plate.