JPH0343636Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a tactile switch applied to industrial robots, machine tools, vending machines, and various other mechanical devices.

<Summary of the invention> This invention has a tiltable actuator that detects a workpiece at the tip of a cylindrical base, a vertically movable plunger that converts the tilting motion of the actuator into linear motion, and a plunger on the underside of the plunger. In the tactile switch, which is formed by press-fitting and fixing a switch base with a built-in switch mechanism,
By forming support parts press-fitted into the base inner hole at the upper and lower parts of the outer peripheral surface of the switch stand, and a recessed part for collecting press-fitted cutting waste between the upper and lower support parts,
This simplifies the press-fitting process, perfectly aligns the axes of the base and switch stand, and improves the performance of the switch.

<Prior Art> In order to downsize and stabilize the operation of this type of tactile switch, the applicant has provided a tiltable actuator for detecting a workpiece at the upper end of a cylindrical base, and installed an actuator inside that controls the operation of the actuator. We have developed a switch that has a plunger that moves up and down, and a switch base with a built-in switch mechanism that is operated by the plunger. In the above configuration, the switch base is shaped like a round shaft and its outer diameter is larger than the inner hole of the base in order to hold the switch by press-fitting, so strong pressure is required during press-fitting and assembly is difficult. It was found that press-fitting cutting waste was generated between the base and the switch base, interposed between the press-fits, and caused the axes of the base and switch base to be misaligned, which was one of the causes of malfunctions such as failure to return. .

<Purpose of the invention> The purpose of the invention is to simplify press-fitting work, eliminate the inconvenience caused by press-fitting cutting waste, and provide a high-performance tactile switch.

<Structure and effect of the invention> In order to achieve the above object, the present invention includes support parts press-fitted into the inner hole of the cylindrical base at the upper and lower parts of the outer peripheral surface of the switch base, and press-fitted parts between the upper and lower support parts. A recess for collecting cutting waste is formed. According to the above configuration, the switch base greatly reduces the frictional force when press-fitting the base, improving workability, and
In particular, press-fitting cutting waste immediately enters the recess, and the switch base can be press-fitted and fixed at the center of the axis of the base, thereby realizing smooth operation of the switch mechanism. Moreover, due to the recessed portion, there is no deformation such as warping or bending in the switch base molded body, and there are practical effects such as eliminating adverse effects on the internal switch mechanism.

<Description of Embodiments> The illustrated tactile switch includes a cylindrical base 1 for attaching and fixing it to a device panel, and a switch mechanism 3.
The switch base 2 according to the present invention is built-in and press-fitted into the cylindrical base, the plunger 4 is slidably disposed inside the cylindrical base and operates the switch mechanism 3, and the plunger 4 is provided between the plunger 4 and the switch base 2. A return spring 5 of the interposed plunger is connected to the tip of the cylindrical base 1, and when the plunger 4 contacts a workpiece and tilts or moves in the axial direction, the plunger 4
and an actuator 6 that operates. The cylindrical base 1 has a flat surface 11 on opposing parts of the outer peripheral surface and a screw groove 12 on the shaft peripheral surface between the two flat surfaces 11, 11.
A conical flange 14 is formed protruding from the upper end of the inner hole of the base, and a plunger chamber 15 is formed in the upper part of the inner hole, and a switch loading part 16 is formed in the lower part of the inner hole of the base. Then, the switch base 2 is press-fitted. The switch stand 2 is a feature of the present invention, and is formed into a round shaft shape by molding a strong synthetic resin material, and has upper and lower parts on the outer peripheral surface.
Press-fit support parts 21 and 22 have a constant axial length and have an outer diameter larger than the base inner hole by the amount of press-fitting, and a press-fit cutting waste recovery recess 23 is formed between the upper and lower support parts 21 and 22. The switch base 2 is divided into a main body 2a and a lid 2b which are deviated from the axial center and divided in the axial direction, a switch mechanism 3 is installed inside the main body 2a, and the lid 2b is integrally connected. The switch mechanism 3 connects a pair of terminals 31, 31 having an inwardly bent contact portion 32 at the upper end to the engaging portion 2 of the main body 2a.
4, and engages a coil spring 34 forming a normally closed contact between both terminals 31, 31 to bias the upper end to both contact portions 32, and from the engagement groove 25 on the upper wall of the main body 2a. A plunger operating shaft 42 inserted into the inner hole of the coil spring 34 is provided with an operating protrusion 43 that presses down the upper end of the coil spring 34, and both terminals 31, 3
Connect the lead wire 36 of the cable 35 to 1,
The lead wire 36 portion is molded with epoxy resin 37.

The plunger is a molded body of synthetic resin, and has an operating shaft 42 that reaches the inner hole of the coil spring 34 from the engagement groove 22 of the switch base at the lower part of the sliding shaft portion 41 that fits into the inner hole of the cylindrical base, and An actuating protrusion 43 is integrally formed on both sides of the actuating shaft 42, and an actuator mounting shaft 61 is formed on the upper surface of the sliding shaft 41.
A support surface 44 is formed to support the plunger 4, and a return spring 5 is interposed between the lower surface of the sliding shaft portion 41 and the upper surface of the switch base 2, and the plunger 4 is upwardly biased to cause the operating protrusion 43 to switch. held in the released position.

The actuator 6 is constructed by attaching a workpiece detector 65 of an arbitrary shape to a mounting shaft 61 that is tiltably supported at the upper end of the cylindrical base 1 . A support part 62 having a conical part 63 corresponding to the conical flange 14 of the base and a flat part 64 on the lower surface is integrally formed at the lower part of the mounting shaft 61, and the support part 62 is in contact with the support surface 44 of the plunger 4. It is engaged between the conical flange 14 of the base 1 and is biased against the conical flange 14 via the plunger 4 by the return spring 5. An elastic sealing material 7 made of a rubber tube is fitted between the base 1 and the workpiece detector 65.

As described above, the present invention forms a press-fit cutting waste collecting recess 23 between the press-fit support parts 21 and 22 and the upper and lower support parts at the upper and lower parts of the outer peripheral surface of the switch base 2 that is press-fitted into the inner hole of the cylindrical base 1. and both support parts 2
1 and 22 are press-fitted and fixed into the inner hole of the base 1, the frictional force at the time of press-fitting is reduced, and workability is further improved. The axes of the base 1 and the switch 2 are completely coaxial, and malfunctions due to misalignment of the axes are completely eliminated, improving the stability and responsiveness of switch operation. In addition, the switch base 2 has a simple structure and has remarkable practical effects, such as the precision of the molded body being obtained by the outer circumferential recess 23 and the ability to eliminate any adverse effects on the switch mechanism 3 at once.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the tactile switch according to the present invention, FIG. 2 is an exploded perspective view, and FIG. 3 is a sectional view of the switch base. 1... Cylindrical base, 2... Switch stand, 21,
22...Press-fit support portion, 23...Press-fit cutting waste collection recess, 3...Switch mechanism, 4...Plunger, 5...Return spring, 6...Actuator.

Claims (1)

[Scope of utility model registration request] A cylindrical base, an actuator that is arranged at the upper end opening of the base to be able to tilt and move up and down to detect a workpiece, a plunger that is loaded into the base and moves up and down when the actuator detects the workpiece, and a plunger that is press-fitted into the base. In a tactile switch equipped with a switch base that is fixed and has a built-in switch mechanism that opens and closes by the vertical movement of a plunger, the outer peripheral surface of the switch base includes support parts that are press-fitted into the inner surface of the base at the upper and lower parts, A tactile switch with a press-fit cutting waste collection recess formed between the upper and lower support parts.