JPH0451397Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switch suitable for use as a position sensor of a transmission, etc., and in particular, the present invention relates to a switch suitable for use as a position sensor of a transmission, etc. This invention relates to a temporary fixing structure for temporary fixing.

[Prior Art] This type of switch is disclosed in, for example, US Pat. No. 3,602,656.
It is well known and is described in the No. 2 publication.

FIG. 6 is a partially cutaway plan view of the switch described in the above publication, and FIG. 7 is a cross-sectional view taken along line A-A in FIG. 6. In these figures, 1 is a synthetic resin board. On the surface of the substrate 1, a plurality of wiring patterns 2 are provided concentrically around the rotation hole 1a. 3 is a metal cover attached to the substrate 1, and the cover 3 is also provided with a rotation hole 3a corresponding to the rotation hole 1a of the substrate 1. Reference numeral 4 denotes a holder made of synthetic resin, and a cylindrical portion 4b having an oval-shaped operation hole 4a in the center is formed protrudingly from one end of the holder 4. They are rotatably inserted into the holes 1a and 3a, respectively. It should be noted that a sealing member such as packing (not shown) is interposed on the bonding surfaces of the substrate 1, cover 3, and holder 4 to ensure waterproof or dustproof properties. Furthermore, contacts 5 such as sliders and movable contacts are supported on the surface of the holder 4 facing the substrate 1, depending on the current capacity of the wiring pattern 2. By rotation,
It is designed to slide on the substrate 1 while coming into contact with and separating from the corresponding wiring pattern 2.

When the switch configured in this manner is mounted on a vehicle, a shift lever (not shown) is connected to the operation hole 4a of the holder 4. Therefore, when the driver operates the shift lever to a predetermined position, the holder 4 rotates and each contact 5 comes into contact with and separates from the wiring pattern 2 (that is, on/off switching is performed).
Desired position signals such as a position signal and a backlight signal are output.

[Problem that the invention attempts to solve]

By the way, in the case of the above-mentioned switch, it is necessary for the holder to be connected at an accurate angular position for each position of the shift lever. For example, it can be shipped temporarily fixed at the center position corresponding to the neutral position of the shift lever.

Conventionally, as such a temporary fixing structure, the sixth,
As shown in FIG. 7, fitting holes 1b and 4c are formed at the center position of the substrate 1 and the holder 4, respectively, and temporary fixing pins 6 made of synthetic resin are inserted into these fitting holes 1b and 4c.
After fitting, apply adhesive 7 to the fitting hole 1b on the board 1 side.
A structure was adopted in which the material was filled with Therefore, by assembling the switch temporarily fixed in the center position in the vehicle and connecting it to the shift lever in the neutral position, the position of the shift lever and the switching timing of the switch can be accurately matched. After assembly, the temporary fixing state can be released by operating the shift lever to shear and break the temporary fixing pin 6.

However, it is very difficult to form both the fitting holes 1b, 4c at predetermined positions with high precision.For example, if one of the fitting holes deviates in the radial direction of the substrate, the fitting holes 1b, 4c 4c do not match, it becomes impossible to fit the temporary fixing pin 6, and if the fitting hole is misaligned in the circumferential direction of the substrate 1 (rotational direction of the holder 4), the substrate 1 and the holder 4
A problem occurs in that the paper is temporarily fixed in a state where it is deviated from the desired center position.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the problems of the prior art described above and to provide a switch that can easily and accurately temporarily fix a holder to a substrate.

[Means for solving problems]

The above object of the present invention is to provide a substrate provided with a desired wiring pattern, a cover attached to the substrate,
A holder having contacts and rotatably supported between the substrate and the cover is provided, and by rotating the holder, the contacts slide on the wiring pattern to turn on/off. In the switch to be switched, a fitting hole is provided on one side of the opposing surfaces of the substrate and the holder, a through hole with a larger diameter than the fitting hole is provided on the other side, and one end of a temporary fixing pin made of synthetic resin is provided. This is generally achieved by tightly fitting into the fitting hole and heat welding the other end of the temporary fixing pin to the through hole.

[Effect]

According to the present invention, the temporary fixing pin is inserted from the through hole side, one end is firmly fitted into the fitting hole, and the other end is heat welded and fixed to the through hole, thereby connecting the substrate and the holder. is temporarily fixed at a predetermined position via a temporary fixing pin. Since the above-mentioned through-holes have a larger diameter than the fitting holes, even if these holes are formed with some misalignment, it will not prevent the temporary fixing pin from being inserted, and the Since a clearance is formed between the temporary fixing pin and the through hole, the temporary fixing position can be finely adjusted using the clearance.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 relate to an embodiment of the present invention, in which FIG. 1 is a plan view of a switch with a part of the cover cut away, FIG. 2 is a cross-sectional view of the main part of the temporary fixing structure,
FIG. 3 is a cross-sectional view showing the temporary fixing process, and FIG. 4 is an explanatory diagram of the temporary fixing process. Portions corresponding to those in FIGS. 6 and 7 are given the same reference numerals, and redundant explanation will be omitted.

In FIG. 1, 2a is a wiring pattern for detecting a reference position (center position in this embodiment), and 2b is a common wiring pattern. When the movers 5 come into contact with each other, the two are electrically connected and a reference position detection signal is obtained. Also,
A small-diameter fitting hole 7 is formed in the substrate 1 near the wiring pattern 2a, and a through-hole 8 having a sufficiently larger diameter than the fitting hole 7 is formed in the holder 4. The body 4 is fixed to the substrate 1 by filling the fitting holes 7 and the through holes 8 with temporary fixing pins to be described later.
It is designed to be temporarily fixed at the center position.
Furthermore, a large diameter opening 9 is provided at the center position of the cover 3.
A cap, which will be described later, is attached to the opening 9 when the switch is assembled.

Next, the temporary fixing process will be explained with reference to FIGS. 2 to 4.

First, the holder 4 and the cover 3 are attached to the substrate 1.
are assembled one after another to obtain the switch shown in FIG. In this state, the holder 4 is rotatable relative to the substrate 1, so that inspections necessary for the switch such as disconnections and short circuits in the wiring pattern 2 can be performed.

Next, a jig is inserted into the operation hole 4a, the holding body 4 is rotated, and the holding body is held based on the reference position detection signal obtained by connecting both the wiring patterns 2a and 2b with the slider 5. The body 4 is accurately aligned with the center position of the board 1, and in this state, a cylindrical temporary fixing pin 10 made of synthetic resin is inserted into the opening 9 of the cover 3.
press fit into the fitting hole 7 through the through hole 8 (the third
(see figure). In this case, since the through hole 8 has a sufficiently larger diameter than the fitting hole 7, a clearance S is defined between the two as shown in FIG. Even if the respective holes 7 and 8 are formed, the fitting hole 7 and the through hole 8 can be aligned using the clearance S described above.

Next, as shown in FIG. 2, a heater chip (not shown) was inserted through the opening 9 to weld the upper part of the temporary fixing pin 10 to the through hole 8, and the remaining part of the through hole 8 was filled with adhesive 11 as necessary. Thereafter, a rubber cap 12 is attached to the opening 9 to ensure airtightness, thereby obtaining a switch in which the holder 4 is temporarily fixed at the center position of the substrate 1.

The switch is shipped and transported in this temporarily fixed state and assembled into a vehicle, and is connected to the shift lever which is installed in the neutral position via a connecting pin inserted into the operation hole 4a. Therefore,
The holding body 4 can be connected at the correct angle for each position of the shift lever, and after such connection, when the holding body 4 is rotated via the shift lever, the temporary fixing pin 10 is inserted into the fitting hole due to the shear force. Since it is cut at the connecting portion between 7 and the through hole 8, the above-mentioned temporary fixing is released.

FIG. 5 is a sectional view showing a temporary fixing structure according to another embodiment of the present invention. In the case of this embodiment, a small-diameter fitting hole 7 is provided on the holder 4 side, and a large-diameter through-hole 8 is provided on the substrate 1 side, so that temporary fixing pins 10 can be inserted and heat welded from the bottom surface of the substrate 1. It's like this. Therefore, the cap 12 is not required, and the number of parts can be reduced compared to the first embodiment described above.

[Effect of idea]

As explained above, according to the present invention, even if the through hole formed for temporarily fixing the holder to the substrate and the fitting hole are formed with some misalignment, the through hole and the fitting hole The respective holes can be accurately aligned by using the clearance defined between the switch and the fixing pin, thereby providing a switch with accurate temporary fixing positions and excellent workability.

[Brief explanation of drawings]

1 to 4 relate to an embodiment of the present invention, in which FIG. 1 is a plan view of a switch with a part of the cover cut away, FIG. 2 is a cross-sectional view of the main part of the temporary fixing structure,
FIG. 3 is a sectional view showing the temporary fixing process, FIG. 4 is an explanatory diagram of the temporary fixing process, FIG. 5 is a sectional view of the main part of a temporary fixing structure according to another embodiment of the present invention, and FIG. 6 is a conventional A plan view of the switch according to the example, FIG. 7 is A-A in FIG.
It is a sectional view along a line. 1... Board, 2, 2a, 2b... Wiring pattern, 3... Cover, 4... Holder, 4a... Operation hole, 5... Slider (contact), 7... Fitting hole, 8 …
...Through hole, 9...Opening, 10...Temporary fixing pin, 1
1...adhesive, 12...cap.

Claims (1)

[Scope of utility model registration request] A substrate provided with a desired wiring pattern, a cover attached to the substrate, and a holder having contacts and rotatably supported between the substrate and the cover, the holder being rotatable. In a switch in which the contact slides on the wiring pattern to switch on/off when operated, a fitting hole is provided on one side of the opposing surfaces of the substrate and the holder, and a fitting hole is provided on the other side. A through hole having a larger diameter than the mating hole is provided, one end of a temporary fixing pin made of synthetic resin is firmly fitted into the fitting hole, and the other end of the temporary fixing pin is heat welded to the through hole. A switch to do.