JPH06198570A - Box wrench and bolt exclusively used therefor - Google Patents

Abstract

PURPOSE:To make also a non-magnetic bolt adhere to a wrench to be fastened. CONSTITUTION:A special purpose bolt 2 to be used is a hexagon or square head bolt so constructed that an engaging hole 9 having a suitable inside diameter (d) and a depth not larger than the height of the head is bored in the central axis position of the head 10. A box wrench l for the bolt is so constructed that a rotation locking wall part to be engaged with the outside of the bolt head 10 is recessed and a cylindrical attaching head 4 having a diameter a little smaller than the diameter (d) of the engaging hole 9 of the special purpose bolt 2 is projected in the central coaxial position of the recessed part. A stem rod 7 is fitted to a box head part 6 formed by fitting to the top part of this attaching head 4, a compressive elastic ring 5 which can be elastically deformed in such a manner that the outside diameter is always larger than the inside diameter of the engaging hole 9 and at the time of compression inward in the radial direction, the outside diameter is smaller than the inside diameter (d) of the engaging hole 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box wrench and its dedicated bolt.

[0002]

2. Description of the Related Art Conventionally, for example, a bolt to be tightened by a magnet can be attached to a box portion by a magnet for tightening bolts in a narrow space where fingers cannot be inserted, a tightening target, or a place where fingers cannot be used due to high ambient temperature. Box wrench is used.

[0003]

However, when the material of the bolt is a non-magnetic material such as non-ferrous metal, this magnet type box wrench cannot be used.
It may also be a precision electronic device in which the tightening work place is a taboo to bring the magnetic material close.

[0004]

These inventions were made in order to solve the above-mentioned problems, and the solving means taken by the invention shown in claim 1 is a hexagonal or square bolt and its head. A dedicated bolt having an appropriate inner diameter engaging hole that is not deeper than the height of the head at the central axis position of the;
A rotation locking wall portion to be engaged with the outside of the bolt head is provided in a concave shape, and a cylindrical attachment head having a diameter slightly smaller than the diameter of the engagement hole of the dedicated bolt is provided at the central coaxial position. At the tip of this attachment head, the outer diameter is usually larger than the inner diameter of the engaging hole, and the outer diameter is smaller than the inner diameter of the engaging hole when compressed inward in the radial direction. A box wrench in which an appropriate stem rod is attached to a box head portion (6) to which a ring is attached.

According to a second aspect of the present invention, in the above box wrench, the compression elastic ring is an O-ring having an outer diameter as appropriate, and the outer diameter of the outer diameter is set when engaging with the engagement hole of the dedicated bolt. It is a box wrench characterized by a diameter reduction of several percent.

[0006]

The compression elastic ring attached to the tip of the adhering head grips the bolt by the elastic force outwardly in the radial direction obtained by compressive deformation, and the rotation locking wall portion engaging with the head of the bolt is attached to the bolt. Give the required torque.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the exclusive bolt 2 of the present invention will be described with reference to FIG. This is the head of an ordinary hexagonal or square bolt 1
An engagement hole 9 having an inner diameter d and a depth b that is not deeper than the height a of the head 10 is formed at the center axis position of 0.

Next, the box wrench 1 will be described with reference to FIGS. 1 and 2. This is a stem rod 7 of appropriate length
The box head 6 is attached to the tip of the fixing pin 8 as shown.
It is fixed by welding, or by welding or the like.

The box head portion 6 is a portion to be engaged with the head portion 10 of the special bolt 2 to be tightened and has a hollow cylindrical shape as a whole, and if the inner wall portion is for a hexagonal bolt, as shown in FIG. As shown in the figure, two regular hexagonal recesses, each of which has a necessary allowance so as to allow the head 10 to be angularly covered and engaged, are aligned at one position and at a position rotated by 30 degrees. The rotary locking wall portion 3 is formed in the form of a hole.

At the position of the central axis of the rotation locking wall portion 3, a columnar deposition head 4 is formed so as to project from the bottom portion. The outer diameter of the attachment head 4 is smaller than the inner diameter d of the engagement hole 9 of the dedicated bolt 2 to facilitate insertion, and the height B thereof is also preferably slightly smaller than the depth b of the engagement hole 9. .

A compression elastic ring 5 such as an O-ring is attached to the tip of the deposition head 4. The term "compressive elastic ring" means a shape that is convenient for generating a restoring elastic force outward in the radial direction when elastically deformed by compression. For example, a thick wall in the radial direction satisfies this condition. The outer diameter D is (1-0.
(05 to 0.07) It is preferable that the size satisfying the condition of D = d, that is, the outer diameter when compressed by several percent is set to a size that can be inserted into the engagement hole 9 of the special bolt 2.

The material may be durable and heat resistant, and either rubber or synthetic resin may be used, but fine irregularities such as a striped pattern are formed on the outer surface in the radial direction to cause friction. Consideration to increase the coefficient is preferable. However, it is better not to increase the friction coefficient in the rotational direction, that is, in the circumferential direction of the compression elastic ring 5.

How to use the box wrench of the present invention and its dedicated bolt will be apparent from the above description of the construction. All that is necessary is to insert the attachment head 4 into the dedicated bolt 2 to be tightened to attach it, and then tighten it to the target location.

[0014]

According to the present invention, even a non-magnetic bolt can be reliably attached to the tip of a box wrench, so that it is easy to tighten the bolt in a place where it is narrow or hot and fingers cannot be used. There is an effect that can be implemented. Further, since it has no magnet, it has an advantage that it can be suitably applied to precision electronic devices and the like that do not like magnetization.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a box wrench of the present invention.

FIG. 2 is an end view of the box wrench of the present invention.

FIG. 3 is a side view showing a dedicated bolt of the present invention.

[Explanation of symbols]

 1 Box Wrench 2 Dedicated Bolt 3 Rotation Locking Wall 4 Attachment Head 5 Compression Elastic Ring 6 Box Head 7 Stem Rod 9 Engagement Hole 10 Head

Claims (2)

[Claims] 1. A dedicated hexagonal or square bolt having an engaging hole (9) of an appropriate inner diameter (d) which is not deeper than the height of the head at the central axis position of the head (10). A bolt (2); a rotary locking wall (3) to be engaged with the outside of the bolt head (10) is provided in a recess, and an engaging hole ( 9) A sticking head (4) in the shape of a cylinder having a diameter slightly smaller than the diameter (d) of 9) is formed so as to project, and the outer diameter of the sticking head (4) is always the inner diameter of the engaging hole (9). The outer diameter is larger than the inner diameter (d) of the engaging hole (9) when compressed inward in the radial direction.
A box wrench in which an appropriate stem rod (7) is attached to a box head portion (6) to which a compression elastic ring (5) that can be elastically deformed to a smaller extent is attached. 2. The compression elastic ring (5) is an O-ring having an appropriate outer diameter, and a few percent of the outer diameter is reduced when engaged with the engagement hole (9) of the special bolt (2). The box wrench according to claim 1, wherein: