JPH0116447Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lifting plunger rotation prevention device for an electric hairdressing chair. The gist is that the concave body surface of the rotor with the inner cavity of the cylindrical body as the shaft insertion hole is brought into rotatable elastic contact with the outer peripheral surface of the elevating plunger, and the shaft is carved with a thread that is rotated by a motor. The purpose of this invention is to prevent the elevating plunger, which is raised and lowered by being screwed together with the rotor, from rotating together with the shaft due to the screw resistance, by elastic contact with the concave body surface of the rotor.

Conventionally, electric hairdressing and hairdressing chairs have been widely used, which are cheaper to manufacture than hydraulic lift type hairdressing chairs and do not have to worry about oil leakage. The elevating plunger, which is screwed together and moves up and down within the fixed plunger, may rotate together with the shaft due to the threaded resistance of the threads, and the elevating plunger may not move up and down, and the seat supported by the elevating plunger may It had the disadvantage that it rotated, causing inconvenience during the treatment.

The present invention eliminates such drawbacks, and its embodiment will be described in detail with reference to the drawings. An elevating plunger 4 having a nut 4' integrally fixed to the inner periphery of the lower end thereof to be screwed with the thread 3' is fitted into a fixed plunger 6 erected on a base plate 5. The outer body surface of the thick short cylindrical body is cut to have an arcuate cross section to form a concave body surface 7', and the inner cavity of the short cylindrical body is formed into a shaft insertion hole 7'' to form a rotor 7 in the form of a split body. Bearings 8... are fixed to the upper end surface of the fixed plunger 6 at positions that sandwich the elevating plunger 4, and the rotor shafts 9, 9 loosely fitted to the rotors 7, 7 are supported by the bearings 8..., as shown in FIG. As shown in FIG. 2, a tension spring 10 is elastically supported between the protrusions of the rotor shafts 9, 9, and the concave body surface 7' of the rotor 7 is rotatably elastically contacted with the outer peripheral surface of the elevating plunger 4. As another embodiment of this elastic contact means, as shown in FIG. A set screw 12 may be screwed into the screw hole. In the figure, 13 is a foot-operated motor forward/reverse rotation switching rod, and 14 is a tightening fixture for the lifting plunger.

Since the present invention is constructed in this way, shaft 3
Shaft 3 is screwed together with thread 3' and nut 4'.
When rotates, the elevating plunger 4 slides against the concave body surface 7' of the rotor 7 and moves up or down while rotating the rotor 7. Since the concave body surface 7' of the rotor 7 rotates and elastically contacts the outer peripheral surface of the elevating plunger 4, which is about to rotate together with the shaft 3, the joint movement is prevented by the frictional resistance, and the elevating plunger 4 It moves up and down reliably without turning unnecessarily, and the seat also moves up and down without rotating.

As described above, the present invention has a robust structure and reliable operation, and is also a useful device that is easy to manufacture and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal front view showing an embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is an enlarged front view of the rotor, Fig. 4 is a plan view of the same, and Fig. 5 is an elevation of the rotor. FIG. 7 is an enlarged plan view of a main part showing another embodiment of the elastic contact means for the plunger. 4... Lifting plunger, 7... Rotor, 7'...
...Concave body surface, 9...Rotor shaft, 10...Tension spring,
11...Press spring, 12...Press screw.

Claims (1)

[Scope of utility model registration request] The outer body surface of the short cylindrical body is cut to have an arcuate cross section to form a concave body surface in the form of a segmented body, and a rotor is formed in which the inner cavity of the short cylindrical body serves as a shaft insertion hole, and the rotor is brought close to the elevating plunger. An elevating plunger rotation prevention device for an electric hairdressing and beauty chair, in which the concave body surface of a pivotally supported rotor is rotatably elastically contacted with the outer peripheral surface of an elevating plunger.