JPH0226445Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to the structure of the opening/closing central shaft of scissors.

(Problems to be solved by conventional techniques and ideas) Conventionally, as this type of structure, for example,
There is one shown in Publication No. 56-32203. In this central opening/closing shaft portion, a nut is locked by the groove or stepped portion of one of the scissors and cannot rotate, and a bolt is screwed into this nut. The bolt and nut are pressed against each other by a leaf spring inside the nut so that they do not rotate relative to each other.

However, since this anti-rotation mechanism utilizes the friction caused by the leaf spring, slippage may occur between the bolt or nut and the leaf spring, and it is not possible to achieve a complete anti-loosening function.

Therefore, the present invention has been devised to reliably prevent bolts from loosening.

Structure of the invention (means for solving problems) That is, as shown in the drawings of the embodiments described later, the invention consists of a pair of scissors made of metal blades 2, 5 and plastic grips 3, 6. Form pieces 1 and 4,
An insertion hole 8 is provided in the overlapping part of the blade 2 of one scissor piece 1 and the grip ring 3, and the blade 5 of the other scissor piece 4 is provided.
A female threaded hole 9 is provided in the blade 5 at the overlapped portion with the grip ring 6, a locking hole 10 is provided in the grip ring 6 corresponding to the female threaded hole 9, and the male threaded portion 13 of the bolt 11 is inserted into one of the scissors pieces 1. It is screwed into the female screw hole 9 of the other scissor piece 4 through the insertion hole 8 from the outer surface, and the head 12 of the bolt 11 is locked to the outer surface of one scissor piece 1, and the male threaded part 13 of the bolt 11 is inserted into the female screw hole 9 of the other scissor piece 4. scissors piece 4
The locking hole 10 of
and a locking surface 13a formed on the rotation prevention member 14,
15a are non-rotatably engaged with each other, and
The inner surface of the locking hole 10 and the rotation prevention member 14
The locking surfaces 10a and 14a formed in the locking surface 10a and 14a are engaged with each other in a non-rotatable manner, and a nut 16 is screwed into the male threaded portion 13 so as to be able to abut against the rotation prevention member 14.

(Function) Both scissors pieces 1 and 4 are connected only by the bolt 11, and after joining, this bolt 11 does not rotate relative to the scissors piece 4 due to the action of the rotation prevention member 14, and the female threaded hole of the scissors piece 4 is prevented from rotating. The bolt 11 is no longer loosened relative to the bolt 9. In addition, due to the action of the nut 16, the rotation preventing member 14 will not fall off, and the rotation of the bolt 11 will also be prevented and its loosening will be eliminated. Further, by forming a locking hole 10 having a locking surface 10a that is unrotatably engaged with a locking surface 14a formed on the rotation prevention member 14 in the plastic grip ring 6, the grip ring 6 A locking hole 10 having the locking surface 10a at the same time as molding.
can be formed, and the dimensional accuracy is significantly improved.

(Example) An example of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the pair of scissor pieces 1 and 4 are integrally formed with metal blades 2 and 5 and plastic grip rings 3 and 6, respectively, and are supported by an opening/closing central shaft portion 7 so as to be openable and closable. There is. This opening/closing central shaft part 7
As shown in FIG.
a and 5a are designed to rub against each other.

Next, the opening/closing central shaft portion 7 will be described in detail. A step-shaped insertion hole 8 is formed in one of the scissors pieces 1, and this insertion hole 8 is connected to a large diameter portion 8a formed in the grip ring 3 and the blade 2.
It consists of a small diameter portion 8b formed in. The blade 5 of the other scissor piece 4 has a female threaded hole 9 which is connected to the insertion hole 8.
It is formed correspondingly. Further, a locking hole 10 is formed in the grip ring 6 of the scissors piece 4 in correspondence with the female screw hole 9, and a hexagonal locking hole is formed on the inner periphery of the locking hole 10 as shown in FIG. A surface 10a is formed.

The bolt 11 shown in FIG. 3 consists of a head 12 and a male threaded part 13. The male threaded part 13 is screwed into the female threaded hole 9 through the insertion hole 8 from the outside of one of the scissor pieces 1, and the head 12 is inserted through this insertion. It is locked to the large diameter portion 8a of the hole 8, and the male threaded portion 13 is exposed to the outside of the other scissors piece 4 through the locking hole 10. A planar locking surface 13a is formed on one side of this male threaded portion 13.

A locking hole 15 is formed in the center of the detent member 14 shown in FIG. 3, and a planar locking surface 15a is formed on one side of the locking hole 15. This rotation prevention member 1
A hexagonal locking surface 14a is formed on the outer periphery of 4. The locking hole 15 of the locking member 14 is fitted into the male threaded portion 13 of the bolt 11, and their locking surfaces 15a and 13a are engaged with each other, so that the bolt 11 cannot rotate relative to the locking member 14. It's summery. Further, the rotation preventing member 14 is fitted into the locking hole 10, and the locking surfaces 14a, 10
a are engaged with each other, so that the locking member 14 and the bolt 11 cannot rotate relative to the other scissor piece 4.

A nut 16 is screwed into the male threaded portion 13 of the bolt 11, and the locking member 14 is pressed against the locking hole 10 by the nut 16.

When assembling the opening/closing central shaft portion 7 of the scissors configured in this way, first tighten the bolt 11 into one of the scissor pieces 1.
is screwed into the female threaded hole 9 of the other scissors piece 4 through the insertion hole 8 of the scissors, and then, just before the bolt 11 is completely tightened, the locking member 14 is fitted onto the bolt 11 and the locking member 14 is locked. Fit into hole 10.

In this assembled state, both scissor pieces 1 and 4 are attached to the bolt 1.
1, and after the bolt 11 is connected, the bolt 11 does not rotate relative to the scissors piece 4 due to the action of the rotation preventing member 14. Therefore, loosening of the bolt 11 in the female screw hole 9 of the scissor piece 4 is reliably prevented.
Also, due to the action of the nut 16, the rotation prevention member 14
Not only will the bolt 11 not come off, but the bolt 11 will also be prevented from rotating and will not become loose.

In addition, a locking surface 14 formed on the rotation prevention member 14
Since the locking hole 10 having the locking surface 10a that is unrotatably engaged with the grip ring 6 is formed in the plastic grip ring 6, the locking hole 10 having the locking surface 10a is formed at the same time as the grip ring 6 is molded. The hole 10 can be formed, and the dimensional accuracy can be significantly improved.

Effects of the invention In short, according to the invention, the female screw hole 9 of the scissors piece 4
To reliably prevent loosening of the bolt 11 by screwing the bolt 11 into the bolt 11, preventing the bolt 11 from rotating with the rotation prevention member 14, and preventing the rotation prevention member 14 from coming off with the nut 16 and preventing the bolt 11 from rotating. Moreover, the dimensional accuracy of the locking hole 10 in which the rotation prevention member 14 is locked can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the scissors according to the present embodiment, FIG. 2 is an enlarged sectional view of the opening/closing central shaft portion thereof, and FIG. 3 is an enlarged exploded perspective view of the scissors. 2, 5...blade, 3,6...grip ring, 1,4...
Scissor piece, 7... Opening/closing center shaft part, 8... Insertion hole, 9...
... Female screw hole, 10 ... Locking hole, 10a ... Locking surface, 11 ... Bolt, 12 ... Head, 13 ... Male thread part, 13a ... Locking surface, 14 ... Stopping member, 14a ...Latching surface, 15...Latching hole, 15a
...Latching surface, 16...Natsuto.

Claims (1)

[Scope of utility model registration request] A pair of scissors pieces 1 and 4 are formed from metal blades 2 and 5 and plastic grip rings 3 and 6, and an insertion hole 8 is formed in the overlapping part of the blade 2 and grip ring 3 of one scissor piece 1.
In addition, a female screw hole 9 is provided in the blade 5 of the other scissor piece 4 at the overlapping part between the blade 5 and the grip ring 6, a locking hole 10 is provided in the grip ring 6 corresponding to the female screw hole 9, and a bolt is provided. 11 is screwed into the female screw hole 9 of the other scissor piece 4 through the insertion hole 8 from the outer surface of one scissor piece 1, and the head 1 of the bolt 11
2 to the outer surface of one of the scissors pieces 1,
The male threaded portion 13 of the bolt 11 is exposed to the outside from the locking hole 10 of the other scissor piece 4, and the locking member 14 is fitted to this male threaded portion 13, thereby forming a lock formed on the male threaded portion 13 and the locking member 14. Stop surfaces 13a, 15a
At the same time, the inner surface of the locking hole 10 and the locking surfaces 10a and 14a formed on the rotation prevention member 14 are unrotatably engaged with each other, and the male threaded portion 13 is fitted with a nut. 16 is screwed together so that it can come into contact with a rotation prevention member 14.