JPH0650930Y2 - Adjustment mechanism for small electric devices - Google Patents

Description

[Detailed Description of the Invention] [Field of the Invention] The present invention relates to an adjusting mechanism of a small electric device which is applied to a touch switch or the like and adjusts an adjusting component inside the case from outside.

[Prior art and its problems]

For example, as a sensitivity adjustment mechanism for the touch switch,
Some are shown in the figure. That is, as shown in the figure, the adjustment component 104 having the adjustment portion 103 on the wiring board 102 in the case 101.
Is fixed, and an O-ring 106 that comes into contact with the rear wall of the case 101, that is, the inner wall of the adjustment operation body fitting hole 105 formed in the adjustment section facing wall 101a is attached to the adjustment operation body 107, and the adjustment operation is performed. The body 107 is fitted into the adjusting manipulation body fitting hole 105 from the outside of the case 101, and the annular recess 1 formed in the manipulation body 107.
The adjustment operation body 107 is rotatably held in the insertion hole 105 by fitting 08 into the annular convex portion 109 formed on the inner wall of the insertion hole 105, and in this state, the adjustment operation body 107 is held.
The operation portion 110 on the front end side of is engaged with the adjusting portion 103.

This is because the adjustment component 104 is independently fixed to the wiring board 102 and the adjustment operation body 107 is independently fixed to the rear wall portion 101a of the case 101. Unnecessary force may be applied to the adjusting portion 103 of the component 104 to make the adjusting operation difficult, or the adjusting portion 103 or the like may be damaged. Further, the O-ring 106 may cause the adjusting operation body fitting hole 1
Since it only contacts the inner wall of 05, the contact pressure was small and the improvement of the sealing effect was limited.

Further, as shown in FIG. 5, the operating shaft portion 1 of the adjusting operating body 107
07a is inserted into the insertion hole 105, and the operation shaft portion 107a is
A protrusion 107b is provided at the front end portion of the adjustment operation body 107, and a taper portion 105a is formed on the inner wall of the adjustment operation body fitting hole 105 so as to face the corner portion 107c between the flange portion 107b of the adjustment operation body 107 and the operation shaft portion 107a. The O-ring 106 that has been formed and is mounted on the corner 107c.
Is pressed against the tapered portion 105a so that the outer peripheral edge portion 107d of the collar portion 107b abuts on the stepped portion 111a of the large-diameter fitting hole 111 continuously provided on the outer periphery of the tapered portion 105a. It is known (see Japanese Utility Model Laid-Open No. 58-98734).

By the way, according to the above configuration, since the outer peripheral edge portion 107d of the collar portion 107b abuts the step portion 111a, when operating the adjustment component 104 with the adjustment operation body 107 as shown in FIG.
If the dimensional accuracy and the mounting accuracy of both 104 and 107 are poor, there are almost the same problems as in the case described with reference to FIG.

[Purpose of device]

This invention was made in order to solve the drawbacks of the above-mentioned conventional ones, and it is possible to set both in an appropriate relationship with a simple structure without being affected by the dimensional error and the mounting accuracy of the adjusting parts and the adjusting operation body. Further, it is an object of the present invention to provide an adjusting mechanism for a small electric device which can improve the sealing performance by an O-ring.

[Constitution and effect of device]

An adjusting mechanism for a small electric device according to the present invention is an adjusting operation body of an adjusting operation body having an operation shaft portion and a flange portion formed on the front end side of the operation shaft portion for preventing outward slipping. The O-ring, which is fitted into the fitting hole from the inside of the case, is provided at the corner portion of the flange portion and the operation shaft portion, and is brought into contact with the tapered portion formed on the inner wall of the fitting hole so as to face the corner portion. The operation portion provided on the front end surface side of the collar portion is engaged with the adjustment portion, and the outer peripheral edge portion of the collar portion is arranged to face the tapered portion with a predetermined gap. Is characterized by.

According to the above configuration, the outer peripheral edge portion of the collar portion is disposed opposite to the tapered portion with a predetermined gap, and the adjustment operation body side fitted into the adjustment operation body insertion hole from the inside of the case has the taper portion. Since the elastic reaction force of the O-ring that is received by the O-ring engages with the adjustment component side, the O-ring absorbs dimensional errors and attachment position errors of the adjustment component and the adjustment operation body, which may damage the adjustment component. Disappears. Further, since it is only necessary to prevent the adjustment operation body from coming out, the structure of this portion is also simplified. Further, since the elastic reaction force of the O-ring acts on both the axial direction and the radial direction of the adjusting operation body by the tapered portion, the sealing property is also improved.

[Explanation of Examples]

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

1 and 2 are an exploded perspective view and a partially cutaway side view showing an example of a touch switch to which an adjusting mechanism for a small electric device according to the present invention is applied.

In the figure, reference numeral 1 denotes an antenna portion, which has a spring wire 2 and an antenna holder 3 as an antenna main body. The antenna holder 3 has a rod-shaped portion 3b formed on the front end side and protruding through a large diameter portion 3a. Serrated surfaces 3c and 3d are formed on the outer peripheral surfaces of the large diameter portion 3a and the rod-shaped portion 3b, and the rod-shaped portion 3b has a coiled base end portion of the spring wire 2.
2a is press-fitted. Reference numeral 4 denotes a cover screwed to a lid head described later, which has a through hole 4a through which the rod-shaped portion 3b of the antenna holder 3 penetrates, and further has the large diameter portion inside.
A press-fitting wall portion 4b for press-fitting 3a is formed. Reference numeral 5 denotes a rubber boot fitted in the annular groove 4c on the outer peripheral side of the cover 4. Reference numeral 6 denotes a connector pin which is press-fitted into a hole 3f formed in the center of the rear end portion 3e of the antenna holder 3 and which is a female pin used for an integrated circuit element.

Reference numeral 8 denotes a case main body made of a metal cylindrical body, and tightening nuts 10 and 11 for mounting are screwed to a screw portion 9 formed on an outer peripheral portion, and toothed washers 12 and 13 are externally fitted. There is.
The front end opening of the case body 8 has a rear end portion of the lid head 14
14a is press-fitted and fixed. Front end 14b of the lid head 14
On the outer periphery of the screw part 15 formed on the inner peripheral surface of the cover 4
A threaded portion 16 that is screwed into is formed. Reference numeral 17 denotes a first O-ring arranged in the lid head 14 and pressed against the rear end surface of the antenna holder 3, and 18 denotes a collar portion 14c of the lid head 14.
The second part which is sandwiched between the front end face of the upper cover and the rear end of the upper cover 4.
This is the O-ring.

Reference numeral 19 denotes a printed wiring board for setting a detection circuit for detecting an object to be detected when the spring wire 2 comes into contact with the spring wire 2 and outputting an electric signal. The circuit element 20 and a variable resistor 21 as a sensitivity adjusting component 21 Is installed. Reference numeral 22 denotes a synthetic resin lid tail that is press-fitted to the rear end side of the case body 8 to form a case 23 together with the case body 8 and the like, and the wiring board 19 is accommodated therein. A switch body 24 is configured by the case 23, the wiring board 19, and the like. The rear wall portion 22a of the lid tail 22 is provided with a tubular portion 26 for pulling out the cable 25 connected to the wiring board 19.

Reference numeral 27 denotes an adjusting operation body fitting hole formed in the rear wall portion 22a of the lid tail 22. The fitting hole 27 has an operation shaft portion 28a and a front end of the operation shaft portion 28a as shown in FIG. The operation shaft portion 28a of the adjusting operation body 28 having the formed outward retaining collar portion 28b is fitted from the inside of the lid tail 22. An O-ring 29 is installed on a corner portion 28c between the flange portion 28b and the operating shaft portion 28a. The O-ring 29 is a taper portion formed on the inner wall of the fitting hole 27 so as to face the corner portion 28c. Pressed by 27a. An operating portion 28d is provided on the front end surface of the collar portion 28b of the operating body 28, and the operating portion 28d receives the pushing reaction force of the O-ring 29 and engages with the groove 21b of the adjusting portion 21a of the resistor 21. I am fit. The sensitivity adjusting mechanism A is composed of the variable resistor 21 and the adjusting operation body 28 as the adjusting parts.

Reference numeral 30 denotes an operation display window formed on the outer peripheral surface of the lid tail 22, and faces the light emitting element 31 for operation display mounted on the wiring board 19. Reference numeral 32 is a contact member press-fitted and held in the lid head 14 and is composed of a male pin. This contact 32
The rear end side is electrically connected and fixed to a predetermined printed portion on the front end side of the wiring board 19 by soldering or the like, and the front end side is removably inserted into the connector pin 6 and electrically connected. Has been done. Reference numeral 33 is a sealing synthetic resin filled in the case 23.

In the above-mentioned configuration, when the object to be detected hits the tip of the spring wire 2, it is detected by the detection circuit on the printed wiring board 19 via the antenna holder 3, the connector pin 6 and the contactor 32, converted into an electric signal, and the cable. It is taken out through 25. The detection sensitivity is adjusted by rotating the adjusting operation body 28 so that the adjusting section 21a is rotated via the operation section 28d. When the cover 4 is pivoted and removed from the lid head 14, the connector pin 6 press-fitted into the antenna holder 3 is pulled out from the contact 32, and a different type antenna part such as a plunger type antenna part can be replaced.

According to the above configuration, since the outer peripheral edge portion 28e of the collar portion 28b is disposed so as to face the tapered portion 27a with a predetermined gap G, the wiring board 19 of the variable resistor 21, which is the adjustment component, is provided. If the variable resistor 21 is displaced toward the adjusting operation body 28 side due to the mounting error of, the adjusting operation body 28 receives an outward force, but the O-ring 29 is received by the taper portion 27a. Force is absorbed. Therefore, the risk that the adjusting portion 21a of the variable resistor 21 and the like are damaged is eliminated. In the direction in which the variable resistor 21 is separated from the adjusting operation body 28,
That is, even if it is displaced to the front side, the adjusting operation body 28 is displaced inward by the elastic restoring force of the O-ring 29, so that the operating portion 28d of the adjusting operation body 28 and the adjusting portion 21a of the variable resistor 21 are The engagement relationship of is properly maintained. Further, since the adjusting operation body 28 is received by the variable resistor 21 from the front side, a special holding structure for the adjusting operation body 28 is not required and the structure is simplified.

Further, since the O-ring 29 is received by the taper portion 27a, a pressing reaction force acts in the axial direction and the radial direction of the adjusting operation body 28, so that the sealing property of this portion can be ensured. it can.

In the above example, the sensitivity adjustment mechanism A of the touch switch has been described as an example, but other adjustment parts may be used, and the present invention can be applied to small electric devices other than the touch switch.

[Brief description of drawings]

1 and 2 are an exploded perspective view and a partially cutaway side view showing an example of a touch switch incorporating an adjusting mechanism for a small electric device according to the present invention, and FIG. 3 is an enlarged cross section of a sensitivity adjusting mechanism of the touch switch. FIG. 4 and FIG. 4 are enlarged sectional views showing a conventional adjusting mechanism of a small electric device. 19 ... Wiring board, 21 ... Adjusting parts, 21a ... Adjusting part, 22a
...... Adjustment section facing wall section, 27 …… Adjustment operation body fitting hole, 27a…
… Taper section, 28 …… Adjusting operation unit, 28a …… Operating shaft section, 28b
…… Collar part, 28d …… Operation part, 28e …… Outer peripheral edge part, G ……
Predetermined gap, 29 …… O-ring.

Claims (1)

[Scope of utility model registration request] 1. A wiring board housed in a case, an adjusting component having an adjusting portion and fixed to the wiring board, and an adjusting operation body fitting hole formed in a wall facing the adjusting portion of the case. An adjusting operation body having an operation shaft portion inserted into the insertion hole from the inside of the case, and a flange portion formed at the front end portion of the operation shaft portion for preventing the slipping outward, and a flange portion of the adjustment operation body. A taper portion formed on the inner wall of the adjusting operation body fitting hole facing the corner portion with the operation shaft portion,
An O-ring that is exteriorly mounted on the corner portion and is pressed by the tapered portion, and an operation portion that is provided on the front end surface of the collar portion and engages with the adjustment portion are provided, and an outer peripheral edge portion of the collar portion is provided. An adjusting mechanism for a small electric device, wherein the taper portion is arranged to face each other with a predetermined gap.