JPH0539870U - Socket trench - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a socket wrench with a screw head locking means having an extremely simple structure in the socket portion 2. A socket wrench is provided with a socket portion 2 having a fitting hole 3 having a polygonal cross-section into which a screw head is fitted, and an annular groove 4 is formed on an outer peripheral surface of the socket portion 2. Provided is an opening 6 communicating from the groove bottom of the annular groove 4 to at least one corner 3a of the fitting hole 3, and one end 8 of a ring-shaped spring 7 fitted in the annular groove 4 is fitted through the opening 6. It is characterized in that it projects into the hole 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a socket wrench that is mounted on a rotary shaft of an electric rotary tool and used to tighten a hexagon headed bolt, a set screw, and the like.

[0002]

[Prior Art]

 In this type of socket wrench, an opening communicating with the fitting hole is provided in the socket section having a fitting hole with a polygonal cross section into which the screw head is fitted, and the sphere housed in the opening is pressed and held by a leaf spring. There is known a device provided with a means for locking the screw head projecting into the fitting hole (see, for example, Japanese Utility Model Laid-Open No. 60-67861).

[0003]

[Problems to be solved by the device]

 However, the screw head locking means in the above-mentioned conventional socket wrench requires a sphere and a leaf spring that presses the sphere, and a set screw for attaching the leaf spring to the socket portion. There was a problem that was high.

The present invention solves the above problems, and an object thereof is to provide an inexpensive socket wrench in which the locking means of the screw head is composed of only one ring-shaped spring.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a socket wrench provided with a socket part having a polygonal cross-section fitting hole into which a screw head is fitted, at the tip of a drive bit. An annular groove is provided on the outer peripheral surface of the, and an opening communicating from the groove bottom to at least one corner of the fitting hole is provided, and a part of the ring-shaped spring fitted in the annular groove is fitted through the opening. It is characterized by protruding into the hole.

[0006]

[Action]

 With the above configuration, the screw head inserted into the fitting hole pushes the protruding portion of the spring outward in the semi-radial direction to fit into the fitting hole, and the spring action presses the socket portion to the socket portion. Locked and held.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a socket wrench according to the present invention, in which a drive hole 1 having a hexagonal shaft has a fitting hole 3 having a hexagonal cross section for fitting a screw head 11 which will be described later. The structure in which the provided socket part 2 is integrally formed is the same as that of the conventional product, and the drive bit 1 is mounted on the rotary shaft of an electric rotary tool (not shown) and rotated.

The socket portion 2 is provided with an annular groove 4 on the outer peripheral surface near the front end opening. As shown in FIGS. 2 and 3, the annular groove 4 is formed by cutting a part of the groove bottom into a flat surface 5 to form an opening 6 communicating with each part 3a of the fitting hole 3.

On the other hand, a ring-shaped spring 7 having a circular cross section is fitted so as to be wound around the annular groove 4, one end portion 8 of which is linearly formed along the flat surface 5, and a semicircular arc-shaped portion 8 a of which is formed into the opening 6. It projects through the fitting hole 3 through the.

As shown by phantom lines in FIG. 3, when the screw head 11 such as the drill screw 10 is inserted into the fitting hole 3 of the socket portion 2 of the socket wrench having the above-mentioned configuration, the screw head 11 is The protruding portion 8a of the ring-shaped spring 7 is pushed outward in the radial direction by the portion 11a and is fitted into the fitting hole 3, and is pressed by the elastic force of the spring end portion 8 displaced to the position shown by the phantom line in FIG. It is locked and held by the socket part 2 to prevent the screw from falling off the socket part 2 during the tightening work.

In the above embodiment, the opening 6 is provided so as to communicate with one corner of the fitting hole 3, but two or more openings may be provided.

[0013]

[Effect of the device]

 As described above, the socket wrench of the present invention has a simple structure in which one ring-shaped spring is fitted in the annular groove provided on the outer peripheral surface of the socket portion, but the screw head fitted in the socket portion The part can be securely retained, and the screw can be effectively prevented from falling off during tightening work.

[Brief description of drawings]

FIG. 1 is a front view of a socket wrench according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view of the main part.

[Explanation of symbols]

 1 Driver Bit 2 Socket Part 3 Fitting Hole 4 Annular Groove 5 Flat Surface 6 Opening 7 Ring-shaped Spring 8 One End of Spring 7 8a Projection Part 11 Screw Head

Claims (2)

[Scope of utility model registration request] 1. A socket wrench provided with a socket portion having a fitting hole having a polygonal cross-section into which a screw head is fitted, at the tip of a drive bit, wherein an annular groove is provided on an outer peripheral surface of the socket portion. An opening communicating from the groove bottom to at least one corner of the fitting hole is provided, and a part of the ring-shaped spring fitted into the annular groove projects into the fitting hole through the opening. Socket wrench to do. 2. The spring has a circular cross section, and a semi-circular arc portion of the spring projects into the fitting hole through the opening.
The described socket wrench.