JPH07164341A - Tubular spanner with clamp retaining means - Google Patents

Abstract

PURPOSE: To provide a tubular box wrench, socket wrench or other types of wrenches with means for holding a fastener to be fastened. CONSTITUTION: The body of this tool has a groove on the circumference of a polygonal seat part 5 of this tool designed so as to house the head part of a bolt or a threaded nut, and one through-hole 10 extends from this groove to the inside of the seat part 4. A spring means 9 having a tongue part (projecting part) formed by radially bending the through-hole 10 is fitted to the circumferential groove, and the tongue part has a structure projecting into the polygonal chamber of this tool.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular box wrench or socket wrench with means for holding fasteners such as bolts or threaded nuts to be tightened.

[0002]

2. Description of the Related Art In the art, when tightening a bolt or a nut, for example, a tool formed by a tube or socket having a seat portion having a shape corresponding to the shape of the head of the bolt to be tightened or the nut It is well known to use.

In order to tighten or loosen bolts or nuts mounted in recessed portions formed in confined spaces, tubular box spanners or socket spanners are commonly connected to extension rods such that It can be used in various areas.

When working in such a situation, the operation of turning the screw is often performed inside a narrow space or a recess formed in such a portion, but in order to do this quickly and reliably. A problem often arises in that members that are screwed in place, such as bolts or threaded nuts, must be properly positioned within the tubular box spanner or socket spanner.

In addition, the bolts and nuts need to be recovered (often dropped into hard-to-reach places), so any time the bolts or threaded nuts are loosened, the risk of falling is avoided and a fast and secure manner is ensured. It is important to be able to recover.

Tubular box spanners and in particular socket spanners with an internal gripping system, for example in the form of spring-loaded balls or similar holding means, are already well known in the market.

[0007]

However, in these known devices, the bolt has a threaded shaft, so that it is very easy to recover the bolt, but when the nut is taken out and recovered. However, there is an inconvenience that the nut cannot be taken out from the tool without using auxiliary means.

Moreover, the resilient retaining means known in the art do not require any insignificant mechanical material for the tool, which results in a considerable increase in the manufacturing cost of the tubular or socket spanner.

The object of the present invention is therefore to overcome the disadvantages inherent in the state of the art, which ensure that the bolt or nut is retained in the tool and that the bolt or nut is retained, for example after being loosened. The object is to propose a tubular box wrench or socket wrench that can be easily removed and reliably recovered and that overcomes the drawbacks of the prior art to be overcome.

Another object of the present invention is not to change the function and spatial requirements of the tool, but to ensure the reliability and durability of the tool even under heavy use, while
In particular, avoid a large increase in manufacturing costs.

[0011]

According to the invention, a tool body has a groove on the outer circumference of a polygonal seat designed to accommodate a bolt head or a threaded nut. There is one hole extending from this groove to the inside of the seat, and the spring means having a tongue (projection) protruding through the hole bent in the radial direction into the polygonal chamber of the tool is provided on the outer periphery. The above object is achieved by a tubular box wrench or socket wrench characterized by being fitted in a groove.

The body of the spring is preferably in the form of a ring with a flat cross section and at least one end of the spring has a projecting deformation which acts as a gripping member.

Preferably, the free end of the bent tongue through the hole of the tool is rounded. This roundness allows the bolts or nuts and the polygonal seat of the tool to be joined without obstruction.

Since the radius of the spring body is slightly smaller than the radius of the inner wall of the groove for accommodating the spring, it is preferable to compress the spring in advance so that it can expand and contract.

To avoid unwanted movement between the annular spring and the tool body, it is preferred to roughen the inner wall of the groove and the inner surface of the annular spring.

Tools with these features can be made at no significant cost.

The peripheral flat groove can be formed simultaneously while rotating the socket, which is economical.

Since the socket must be provided with a number of lateral threads and holes, additional holes from the peripheral groove to the chamber inside the tool are not extra costly.

Finally, since it has an annular spring, preferably made of steel for flat and elongated piano wires,
No need to increase the spatial requirements of the tool. The tongue protruding inside the tool can be easily made by a simple cutting operation.

Since the annular spring is a discontinuous ring, one end of the spring can be bent outward in the radial direction to form the grip member. By applying a force to this gripping member to bend the ring of spring and thus the inwardly bent tongue, the bolt or nut housed inside the polygonal chamber can be easily removed.

The design according to the invention is illustrated in the drawings and illustrated in the form of an example given purely by way of example.

[0022]

[Example] Socket spanner (marked as 1 as a whole)
Has at one end a seat 2 into which, for example, a transmission rod is inserted, which is articulated by means of a laterally threaded pin (not shown). Of course, the spanner can be integrally formed with rigidity.

The socket 1 is formed at the end opposite the seat 2 in a manner known as a chamber in which an internal chamber 5 is bounded by walls forming a polygon, for example a hexagon.

The chamber 5 has an opening noted 6 at the end of the tool 1. The chamber 5 can engage through the opening 6 with the hexagonal head of the bolt, or a threaded nut 7 as shown in FIG.

The tool 1 has, in the vicinity of the opening 6, a groove noted 8 on the periphery. The groove 8 is conveniently formed in the form of a groove having a shallow depth and a relatively wide width. Of course, it is also possible to choose a groove 8 of another shape.

A spring 9 is accommodated in the groove 8. This spring 9 is preferably made of steel for elongated piano wire, and more preferably in the form of a notched ring.

A through hole 10 extends laterally from the inner wall of the groove 8 to the chamber 5 which houses the nut 7. A tongue 11 is formed from the elongate spring 9 which extends radially from the circumference of the spring 9 into the interior of the chamber 5 by cutting or some other deformation method. Preferably, the tongue 11 is formed with a smoothed or rounded end 12 in order to smoothly pull the nut into the body when the nut 7 is introduced into the chamber 5.

FIG. 1 shows a vertical section of the tool 1.

It will be appreciated that the tongue 11 projecting radially inside the chamber 5 is dimensioned such that its end 12 extends a certain distance into the chamber 5.

In FIG. 3 it can be seen that the spring 9 is made in the form of a notched ring surrounding the body of the tool 1. The annular spring 9 is provided with break edges 20 and 21.
It is expedient to have a tongue 11 near the end 21 of the spring 9.

Further, in FIG. 3, it is preferable that the spring 9 is elastically compressed in advance with respect to the main body of the tool 1, and the force of the spring 9 causes the tongue portion 11 to make a hole in the nut 7. It can be clearly seen that the nut is fixed to the polygonal seat 5 by pressing it against the chamber wall opposite 10. Again, as can be seen from FIG. 3, the ends 21 of the spring 9 form a small gripping member 22 with a radially outwardly directed deformation, whereby the ends 21 and 22 of the spring 9 are brought out. In that direction, this movement also causes the tongue 11 to move radially outwards, which causes the nut 7 to move.
Is released from the constraints inside the chamber 5 and is able to exit the seat 5.

The tool 1 operates as follows. That is, the nut 5 that is turned and tightened or loosened is connected to the chamber 5. In the process of coupling the tool 1 and the nut 7, the tongue 11 is pushed by the main body of the nut 7 and moves a small distance outward in the radial direction. The force transmitted to the nut 7 body by the spring 9 and the tongue 11 ensures that the nut 7 is held in the desired position inside the chamber 5.

After loosening the nut 7, the tool 1 is taken out together with the nut 7 from the structural unit of which the nut 7 was a part. The nut 7 is held in place by the spring 9 and the tongue 11, so that
To remove it, all that is required is to apply a force to the end 22 of the spring 9, for example with a fingernail. By this means, the tongue 11 as well as the end 22 of the spring can be bent radially outward, the distance of travel being sufficient for the tongue 11 to release the nut 7 and the nut 7 Can be dropped from the chamber 7.

It should be noted that the reference numbers in the claims are not to be construed as limiting the technical scope thereof for the purpose of easy understanding of the invention.

[0035]

As described above, according to the present invention, the bolts and nuts can be securely held in the tool, and the bolts and nuts can be reliably collected and taken out after being loosened. A possible tubular box spanner or socket spanner can be obtained at a small cost.

[Brief description of drawings]

1 is a partial cross-sectional perspective view of a tool of the present invention.

FIG. 2 is a vertical sectional view of the tool.

3 is a cross-sectional view of the tool taken along line III-III shown in FIG.

[Explanation of symbols]

 1 Spanner 5 Seat 7 Fastener 8 Groove 9 Spring 10 Through Hole 11 Tongue 12 Free End 20 Wheel 21 Wheel

Claims (6)

[Claims] 1. A tubular spanner (1) having means for holding a fastener (7) to be tightened, the main body of said spanner (1) accommodating a head of a bolt, a nut with a thread or the like. Has a groove (8) on the outer periphery of a polygonal seat (5) designed so as to have a through hole (10) extending from the groove to the inside of the polygonal seat (5) of the spanner (1). ) Of the tongue (1) which is bent in the radial direction and protrudes through the through hole (10) and inside the polygonal seat (5) of the spanner.
Tubular spanner with means for holding a fastener to be used, characterized in that spring means (9) with 1) are fitted in said groove (8) on the outer circumference. 2. Tubular wrench according to claim 1, characterized in that the spring (9) is made with a flat cross section in the form of a notched ring (20, 21). 3. A tongue (1) passing through said through hole (10).
2. A tubular spanner according to claim 1, characterized in that the free end (12) of 1) is rounded. 4. The radius of the spring body is such that the groove (8)
Slightly shorter than the radius of the inner wall of the
The tubular spanner according to claim 1, wherein the tubular spanner is compressed in advance so that it can expand and contract. 5. The inner wall of the groove (8) and the inner wall of the groove (8) to avoid movement of the inner wall of the groove (8) and the annular spring (9) between the body of the spanner and the spring. A tubular spanner according to claim 1, characterized in that the inner surface of the annular spring (9) is roughened. 6. The end (21) of the annular spring (9), which is closer to the tongue (11), has a deformable portion (22) directed radially outward and acting as a gripping member. The tubular spanner according to claim 1, which is characterized in that.