JPH0585687U - Holder metal stopper - Google Patents

Abstract

(57) [Summary] [Purpose] Easy to attach to the holder core, and firmly attached so that it does not fall out easily. Furthermore, the allowable range of variations in the inner diameter of the fastener and the outer diameter of the holder core Is wide. [Structure] A coil spring having an inner diameter slightly smaller than the outer diameter of the holder core is screwed onto the outer peripheral surface of the rear end of the holder core having a diameter of about 2 mm.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a so-called holder core stopper having a diameter of about 2 mm, and an object thereof is to provide a holder core stopper that can be firmly and easily mounted.

[0002]

[Prior Art]

 To prevent the holder core from falling out of the chuck at the tip of the holder, the conventional core holder has a structure in which a stopper is attached to the rear end of the holder core, and this stopper is locked to the rear end of the chuck. This holder core stopper is known to be a system in which a stopper made of an elastic tubular tube having a slit in the axial direction is press-fitted to the outer peripheral surface of the rear end of the holder core. In order to smoothly fit the stopper to the holder core, it is necessary to chamfer the outer peripheral surface of the rear end of the holder core, and the accuracy of the outer diameter of the holder core and the inner diameter of the stopper is required. To be done.

[0003]

[Problems to be solved by the device]

 However, the conventional holder core retainer is made of elastic aluminum material, and when it is attached to the rear end of the holder core, the rear end of the holder core is not chamfered. May not return to the original state, but may remain slightly expanded, and the stopper may come off the holder core, or the stopper may abut the inner wall surface of the core storage pipe and prevent the holder core from sliding. There was Also, if the outer diameter of the holder core is too large, or conversely the inner diameter of the stopper is too small, the stopper cannot be attached to the holder core, and it will expand slightly with the slit, but the holder core is soft The metal fittings were worn with the core removed, and the metal fittings were sometimes pulled out. Furthermore, if the rear end of the holder core is chamfered, the stopper can be fitted smoothly, but an extra work of the chamfering process is required, which causes a problem of increasing the assembly cost.

[0004]

[Means for Solving the Problems]

 The holder core retainer according to the present invention solves the above-mentioned problems, and a coil spring having an inner diameter slightly smaller than the outer diameter of the holder core is screwed onto the outer peripheral surface of the rear end of the holder core. It is a thing.

[0005]

[Action]

 In the present invention, a screw is attached to the rear end of the holder core so that a spiral is also engraved on the holder core, so that the holder core retainer does not easily come off from the holder core. Further, since it is not necessary to provide a slit or the like, the expansion of the slit does not hinder the sliding of the holder core.

[0006]

【Example】

 The present invention will be described in more detail with reference to an embodiment shown in the drawings. FIG. 1 shows a state where the holder core stopper according to the present invention is attached to the holder core. The holder core 1 has a diameter of about 2 mm on the outer peripheral surface of the rear end portion of the holder core 1 more than the outer diameter of the holder core 1. Since the coil spring 2 with a slightly smaller inner diameter is screwed on, the outer diameter of the holder core 1 is slightly larger than the predetermined dimension due to variations in the manufacturing process, and conversely, the inner diameter of the coil spring 2 is predetermined. The coil spring 2 can be mounted even if it is slightly smaller than the above because it is screwed while scraping the outer wall of the holder core 1.

[0007]

[Effect of the device]

 As described above, the holder core retainer according to the present invention has a spiral engraved on the holder core by screwing the retainer retainer consisting of a coil spring onto the holder core, so that the retainer can be easily attached from the holder core. Since it does not come off and it is not necessary to provide slits, etc., the assembly process can be simplified and the cost can be reduced, and at the same time, it does not hinder the sliding of the holder core, and the outer diameter and stop of the holder core. The allowable range of variation in the inner diameter of the metal fitting is widened.

[0008]

[Brief description of drawings]

FIG. 1 is a front view showing a holder core stopper according to the present invention mounted on a holder core.

FIG. 2 is an enlarged perspective view of a holder core stopper according to the present invention.

[Explanation of symbols]

 1 Holder core 2 Coil spring

Claims (1)

[Scope of utility model registration request] 1. A holder core retainer comprising a coil spring, the inner diameter of which is slightly smaller than the outer diameter of the holder core, screwed onto the outer peripheral surface of the rear end portion of the holder core.