JPH0246838Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of the pivot structure of scissors-type tools in a broad sense, including scissors, planers, etc., and in particular, a cylindrical structure made of a wear-resistant material that is fitted into the pivot part of scissors, etc. Regarding the sleeve.

Scissor tools are simple tools consisting of a pair of levers pivoted together, and are extremely versatile. A typical example is scissors for shearing sheet materials, etc., in which a pair of scissor members are pivoted to each other via a pivot at a lever fulcrum located in the middle of each, and one end has side edges facing each other and serves as a shearing blade;
The other end is formed as a handle for applying force, and by applying opposing forces to both handles,
Both scissor members rotate relative to each other to shear the sheet or the like between the shearing blades.

Conventional scissor-type tools of this type are formed by having a small hole drilled in the pivot portion and riveted or screwed together with a pin, but this pivot portion is prone to malfunctions.

That is, small diameter pins and small holes are preferred because they are easy to manufacture. In this case, during use, the pins are subject to torsional stress or shear stress and are susceptible to loosening, wear, and breakage, resulting in a shortened service life.

In order to prevent such defects, making the pins thicker will extend the service life and reduce the above-mentioned defects, but it will not completely eliminate them, and furthermore, the appearance will be impaired.

The present invention has been made in view of the above, and aims to provide a scissors-type tool equipped with a pivot structure that can solve the above problems and improve the durable strength and usability of the scissors-type tool. purpose.

As a means for achieving the above object of the present invention, circular enlarged diameter holes concentric with the pin holes are formed on opposite sides of the pivot parts of both scissors members so as to face each other, and wear-resistant material is used. The present invention is characterized in that a cylindrical sleeve formed with a cylindrical sleeve is sandwiched so that both ends thereof fit into each enlarged diameter hole.

The above-mentioned sleeve has an outer diameter such that each enlarged diameter hole is slidably fitted to each other at the contact surface, an inner diameter that does not make any contact with a pin that passes through the scissor member and the inner hole of the sleeve, and is pivoted, and a shaft. The thickness in this direction is approximately equal to the sum of the depths of both enlarged diameter holes.

In order to clarify the above and other objects and features of the present invention, embodiments will be described in detail below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment in which the present invention is applied to gardening scissors. A circular enlarged diameter hole 21 (only one side is shown in the figure) is cut in the mutually opposing surfaces of the Butsuthing (sleeve)
30 are fitted.

Both ends of the bushing 30 are fitted into the enlarged diameter hole 21, and the outer diameter thereof is as follows.
It is in sliding contact with the inner peripheral surface of the enlarged diameter hole. The inner diameter of the center hole 31 of the sleeve is such that it does not come into contact with the pin holes 12 and 22 at all, and the thickness in the axial direction is approximately equal to the sum of the depths of both enlarged diameter holes 21. There is.

With the bushing 30 fitted into the enlarged diameter hole 21, both the scissors 10 and 20 are pivoted to each other with pins 40 so that their respective shearing forces are opposed to each other at the same time. The pin 40 has a screw 41 formed at its tip, and the scissor member 10,
20, for example pin 22
has a female thread 23 carved therein, which is screwed into this, first passes through the center hole 31 of the bushing 30 through the pin hole 12, then screws into the pin hole 22, and then causes its tip to protrude outward. It is fastened by a nut 50.

The degree of contact and sliding between the shearing blades of the scissors 10 and 20 is adjusted by the state of the screw engagement between the pin 40 and the pin hole 22, and after adjustment, the nut 50 is tightened to hold it. It is set as.

Further, it is preferable that the pin 40 and the nut 50 each have a flat head shape.

With such a configuration, in the scissor type tool based on the present invention, the pin 40 only pivotally connects and holds both the scissors members 10 and 20,
Frictional force, torsional stress, shearing stress, etc. generated during shearing all act between the cylindrical outer peripheral surface of the cylindrical bushing 30 and the inner peripheral surface of the enlarged diameter hole 21 of the scissors members 10 and 20. As a result, they are distributed over a much larger surface area than the pins 40 and pin holes 12 and 22.

Also, because the bushing 30 is relatively large in size and easy to manufacture, it can be manufactured from a wear-resistant material.

Therefore, the effect of significantly improving durability and lengthening the useful life can be obtained. In addition, compared to conventional pin rivets, the dimensions of the pins 40 are not much different, but the tightening can be adjusted according to the wear condition of the shear blades and other friction parts, while still maintaining the appearance. I'm done.

Another embodiment of the present invention is shown in FIG. 3, which is applied to relatively thin-walled scissors.

The difference from the above embodiment is that both scissors members 60,
A bushing 30 having a thickness that is thicker than or approximately equal to the sum of the wall thicknesses of the bushings 70 and 70 (hereinafter, members corresponding to those in the first embodiment will be given the same reference numerals and detailed explanation thereof will be omitted) is fitted. In order to facilitate this, a raised portion 64 (only one side is shown in the figure) is formed on the pivot portion, and an enlarged diameter hole 72 (only one side is shown in the figure) is formed on the back surface of the raised portion 64 (only one side shown in the figure). .

As a result, the bushing 30 can be fitted into the enlarged diameter hole 72, the pin 40 can be passed through the bushing 30, the bushing 30 can be screwed into the bushing 30, and the nut 50 can be tightened.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment in which the present invention is applied to gardening scissors. 2 is a perspective view of the gardening scissors of FIG. 1; FIG. FIG. 3 is an exploded perspective view showing an embodiment in which the present invention is applied to ordinary scissors. 10, 20... Scissor member, 12, 22... Pin hole, 21... Enlarged diameter hole, 23... Female thread, 30...
...Butting, 31...Center hole, 40...Pin,
41...Screw, 50...Nut, 60,70...
Scissor member, 64... Protuberance, 72... Enlarged diameter hole.

Claims (1)

[Claims for Utility Model Registration] (1) A scissor-type tool consisting of a pair of scissors, a pin, and a cylindrical sleeve, the pair of scissors being pivotally connected to each other with a pivot, Symmetrical enlarged circular holes are cut in the inner opposing surfaces of the pivot portions of the pair of scissor members, and the cylindrical sleeve is formed of a wear-resistant material and has an axially extending diameter. The thickness is approximately equal to the sum of the thicknesses of both enlarged diameter holes, and the inner diameter thereof is large enough to prevent any contact with the pin that passes through the scissor member and the inner hole of the sleeve and is pivoted to prevent the pin from being worn out. 1. A scissors-type tool, characterized in that both ends of the cylindrical sleeve are fitted so as to come into contact with and slide on the inner peripheral surface of each enlarged diameter hole. (2) A female thread is formed in the pin hole of one of the pivot parts of the scissor member, and a thread that can be screwed into the tip of the pivot pin is formed. A scissor-type tool according to claim (1) of the utility model registration claim.