JP2541436Y2 - Backlight switch for vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backward light switch for turning on or off a backward light used when a vehicle traveling on the ground, such as an automobile, a forklift, or a tractor, moves backward.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 10, a backward light switch A has a partly formed male screw portion B. The male screw portion B is screwed into a wall of a case M of a transmission, for example. The hexagonal head N is tightened with a spanner. An operating rod L is provided so as to be able to protrude and retract from the axis of the male screw portion B. When any of the operation links (not shown) connected to the operation lever of the transmission is moved backward, the operation is performed. As a result, the head of the operating rod L is pressed or released, and the electrical contact accommodated in the backward light switch A is interrupted.

The back light switch A is connected via a connector C to a power source provided on the vehicle body side and an electric wire leading to the back light. The connection modes are roughly classified into two types. That is, as shown in FIG. 2A, the switch body of the backward light switch A and the connector C are separately formed, and the switch body is connected by an electric wire E between them, as shown in FIG. The connector C is integrally attached to the switch body of the backward light switch A, and is internally connected.

[0004]

However, in any case, the backward light switch A is screwed into the case M of the transmission by the male screw portion B and is supported. When attaching A, work had to be performed while being careful not to entangle the electric wire E with other parts, and it was difficult to increase productivity. In the case where the connector C is provided in the back light switch A itself, the connector C is connected instead of the electric wire E to a portion of the switch body from which the electric wire is led out. There was a problem that it protruded greatly from the

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by connecting a male screw member having a hexagonal head to one side of a switch box for supporting a contact to form a switch chamber therein, A rearward light switch for a vehicle in which the contact is interrupted by an operation rod inserted into a switch chamber through a shaft hole formed in the member, and the male screw member and the switch box are rotatably connected to each other around an axis of the operation rod.
, The switch box has one end on a side surface thereof.
The other end extends in the direction orthogonal to the shaft hole of the male screw member.
To provide a connection electrode that is connected to the electric wire on the vehicle body side
It is a thing. Specifically, before Symbol opening is formed to open toward the switch box side, solves by arranging the connecting electrode in the opening.

[0006]

The male screw member is rotatably connected to the switch box, and independently rotates only the male screw member without rotating the switch box or the contacts directly supported by the switch box. Can be. The connection electrode of the switch box extends in a direction perpendicular to the shaft hole of the male screw member, that is, extends laterally from the side surface of the switch chamber . Installed side by side.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. First, in FIG. 1, reference numeral 10 denotes a power unit of an automobile to which the backward light switch 1 according to the present invention is attached, 11 denotes an engine, and 12 denotes a transmission. Transmission 12
The front surface is attached to the rear end of the engine 11 via a clutch case 13, and the rear surface is provided with an operation case 15 extending toward a transmission lever 14 disposed in the vehicle interior. In this embodiment, the backward light switch 1 is attached to the root of the operation case 15.

The backward light switch 1 has a switch box 3 constituting a switch chamber 5 and a male screw member 2 attached to one side thereof. A fixed contact 5a is provided inside the switch box 3.
And a short-circuit piece 5b serving as a movable contact. The male screw member 2 has a hexagonal head 2a and a male screw 2b, and the backward light switch 1 is connected via the male screw member 2 to a mounted portion on the vehicle body (not shown), that is, the operation case 15
The hexagonal head 2a is fixed by tightening it with a spanner.

The switch box 3 is formed by injection molding of a synthetic resin, supports the two electrodes forming the fixed contact 5a by molding, and connects the fixed contact 5a to an electric wire guided from the vehicle body. Opening 3 as part
a. Reference numeral 3b denotes a connection electrode to which the connector 1c on the vehicle body side is connected. In this embodiment, the fixed contact 5a
Is constituted by the outer end. 3c is a guide projection for guiding the connector 1c on the vehicle body side.

Reference numeral 4 denotes an operating rod which is pressed and operated by an operating link of the transmission. The actuating rod 4 is slidably fitted into a large and small shaft hole 2d provided on the male screw member 2 concentrically with the male screw 2b, and the inner end thereof projects into the switch chamber 5 through the shaft hole 2d. I have. The operating rod 4 is pressed against the flange 4b from the back by the coil spring 4a, and the flange 4b is in contact with the end face of the shaft hole 2d formed on the front to be prevented from coming off. The large-diameter portion of the shaft hole 2d also functions as the spring hole 3d of the coil spring 4a.

The male screw member 2 and the switch box 3 are connected by a clip 1a as shown in FIGS. That is, a clip 1a forming a missing circle between the annular groove 2e formed on the inner surface of the hexagonal head 2a of the male screw member 2 and the outer peripheral groove 3f formed on the outer periphery of the opening 3a of the switch box 3.
, And a substantially cylindrical switch chamber 5 is formed between them. Reference numeral 1b denotes a rubber-like sealing ring for sealing between the male screw member 2 and the switch box 3, and seals the gap between the male screw member 2 and the switch box 3 in a rotatable state. 2c is the male screw member 2
Is a relatively large chamfered portion provided on the opening side of the hexagonal head 2a, and when the male screw member 2 and the switch box 3 are connected to each other,
This is provided so that the clip 1a can easily advance to the inner surface of the hexagonal head 2a.

The contact member forming the main part of the backward light switch 1 is composed of two fixed contacts 5a and a short-circuit piece 5b for conducting or cutting off between them. The fixed contact 5a is made of a copper alloy, and has a pair of two ends, one end of which has a shape of a chevron (a so-called angle material) and the other end of which has a strip shape. The fixed contacts 5a, 5a are integrally inserted when the synthetic resin switch box 3 is molded, and are supported symmetrically side by side. One end of the chevron is exposed in the switch chamber 5 and the other end protrudes into the opening 3a.
The connection electrode 3b is connected to the connection electrode 3c. Therefore, since it is not necessary to connect the fixed contact 5a and the connection electrode 3b via an electric wire, the number of parts can be reduced and the structure is simplified.

Reference numeral 3e denotes a sealing member for preventing water from entering, and is made of a soft synthetic resin. Thus,
Since the opening 3a connected to the connector 1c on the vehicle body side is arranged parallel to the side of the switch room 5 along the wall surface of the transmission case 12a, the length of the backward light switch 1 protruding from the wall surface. To prevent it from increasing.

The shorting piece 5 b is formed by bending a strip-shaped plate made of a copper alloy into a substantially inverted U-shape, and is supported by the operating rod 4. At the end of the leg portion of the short-circuiting piece 5b, a contact portion 5c bulging outward in a hemispherical shape is formed so that the contact pressure of the contact is stabilized. The distance between the two legs is slightly larger than the width of the square hole 4d formed in the operating rod 4, so that the short-circuit piece 5b presses and shrinks the inverted U-shaped leg {in the square hole 4d. And is prevented from coming off by the spring pin 4c.
Thus, the short-circuit piece 5b is prevented from expanding outward, and is allowed to slightly shrink inward.

The backward switch 1 is assembled as follows. First, the short-circuit piece 5b is inserted into the square hole 4d of the operation rod 4, and the spring pin 4c is inserted from the side to prevent it from falling off. A clip 1a is fitted into a groove provided on the outer periphery of the upper part of the switch box 3, and a seal ring 1 is further provided on the outer periphery of the end.
After fitting b, it is supported upward by a jig (not shown), and a coil spring 4a is inserted and supported in the spring hole 3d.

Next, the operation rod 4 supporting the short-circuiting piece 5b is inserted into the shaft hole 2d of the male screw member 2 and is gripped so as not to fall down. Put on top and press down from above. Then, the outer periphery of the clip 1a, which is formed as a broken circle, is pushed into the outer peripheral groove 3f by the chamfered portion 2c formed on the hexagonal head 2a.
That is, the clip 1a is reduced in outer diameter and retreats into the groove. Therefore, the hexagonal head 2a of the male screw member 2 and the outer periphery of the switch box 3 are fitted, and further pressed to fit deeply, so that the groove formed on the inner surface of the hexagonal head 2a reaches the outer periphery of the clip 1a. Then, the clip 1a is restored and the hexagonal head 2a
In the side grooves, thereby securing them axially.

Generally, the backward switch 1 has a normally open type and a normally closed type. FIG. 8 shows the former and FIG. 9 shows the latter. In the normally open type, the backward light switch 1 is normally in the cut-off state, and the operation is performed only when the operating rod 4 is pressed, and the normally closed type is always in the conductive state, and the operating rod 4 is pressed. It is configured to be shut off only at the time. That is, in the normally open type, the operation rod 4 is used so as to be pressed only when the shift lever (not shown) in the driver's seat is operated to the retreat position.
It is used so that the shift lever in the driver's seat is pressed when it is in the forward position, and the operation rod 4 is released only when it is operated in the backward position.

The operation of both types of switches will now be described with reference to FIGS. The operating rod 4 is a coil spring 4a
In the normally open type (FIG. 8), the contact portion 5c formed on the leg portion of the short-circuit piece 5b is located at the position I where the contact portion 5c protrudes outward by being pushed by
It is above the fixed contacts 5a, 5a and does not contact any of them. On the other hand, in the normally closed type (FIG. 9), the contact portion 5c is interposed between the two fixed contacts 5a, 5a,
The two fixed contacts 5a and 5a are simultaneously in contact with each other, and are electrically connected between the fixed contacts 5a and 5a via the short-circuiting piece 5b.

When the transmission is operated and the operating rod 4 is pushed in against the elasticity of the coil spring 4a, the operating rod 4
Reaches the most depressed position III via the intermediate position II, and the state at each position is indicated by a two-dot chain line.
In the position III, in the normally open type (FIG. 8), the contact portion 5c intervenes between the two fixed contacts 5a, 5a and simultaneously contacts the two fixed contacts 5a, 5a. In the normally closed type (FIG. 9), the contact portion 5c has two fixed contacts 5a, 5a.
And the fixed contacts 5a, 5a are disconnected. Thus, when the transmission is operated backward, the reverse light switch 1 is turned on and the reverse light is turned on.

Since this embodiment is constructed as described above, in order to mount the backward light switch 1 to the operation case 15, the backward light switch 1 is supported by the switch box 3 and the male screw member 2 2b is applied to the screw hole of the operation case 15, and the hexagonal head 2a is screwed with a finger or a tool. That is, the rotation is performed only by rotating the male screw member 2 without rotating the switch box 3.

[0021]

[Effect of the Invention] As described above, since the male screw member constituting the back light switch can rotate independently of the switch box supporting the contact member, the electric wires and other accessories derived from the switch box are provided. It is possible to rotate without being restricted by the above, and there is an effect that the assembling work can be easily performed. Also provided on the side of the switch box
The connection electrode has one end located in the switch chamber and the other end in a direction perpendicular to the shaft hole of the male screw member, that is, it can be arranged in parallel along the case surface of the transmission, so that it protrudes from the transmission case of the backward light switch. Ru can avoid a longer length to
At the same time, the length of the switch room can be lengthened,
The effect is obtained such that a sufficient stroke can be obtained for the operating rod .

[Brief description of the drawings]

FIG. 1 is a side view showing a power unit of a vehicle using a reverse display switch of a transmission according to the present invention.

FIG. 2 is an enlarged front view showing a main part thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a plan view thereof.

FIG. 5 is a bottom view thereof.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 4;

FIG. 7 is a sectional view taken along the line VII-VII.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a sectional view corresponding to FIG. 8 and showing a modification of the backward display switch.

FIG. 10 is a side view showing a mounting structure of a conventional backward display switch.

[Explanation of symbols]

 1 ··· Backlight switch 1a · · · Clip 1b · · · Seal ring 2 · · · male screw member 2a · · · Hex head 2c · · · Chamfered portion 2d · · · Shaft hole 2e · · · Annular groove 3 Switch box 3a Opening 3b Connection electrode 3d Spring hole 3e Seal member 3f Outer peripheral groove 4 Working rod 4c Spring pin 5 ··· Switch room 5a ··· Fixed contact 5b ···· Short circuit piece 5c ··· Contact point 10 ··· Power unit of automobile 11 ··· Engine 12 ··· Transmission 13 · Clutch case 14 ... Transmission lever 15 ... Operation case

Claims (2)

(57) [Scope of request for utility model registration] 1. A male screw member is connected to one side of the male screw member.
Form a switch chamber with a switch box and form a male screw member
Insert the operating rod into the switch chamber through the shaft hole
The switch is intermittent by the reciprocating motion, and
Connect the male screw member to the switch box around the axis of the operating rod.
Backlight switch for vehicles that are pivotally connected to each other
And one end is located inside the switch room on the side of the switch box.
And the other end extends in a direction orthogonal to the shaft hole of the male screw member.
Connecting electrodes to be connected to the wires on the vehicle body
Backlight switch for vehicles. 2. The switch box according to claim 1, wherein
An opening that opens toward the side is provided alongside the switch room,
The connection electrode is arranged in the opening, and
One end of the connection electrode extends into the switch chamber to form a fixed contact.
Back light switch for a running vehicle.