JPH0217816Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement in the handle of an interchangeable screwdriver that has excellent strength and is durable for long-term use.

(Prior Art) The handle of a conventional interchangeable screwdriver has two fitting grooves 9 in the central hole 3 of the handle main body 1, as shown in FIG.
In the interchangeable screwdriver in which a metal tube 12 provided with a metal tube 12 is fitted inside to replace the driver shaft 10, a long hole 13 communicating with the central hole 3 of the handle body 1 is formed from the inner circumferential wall of the metal tube 12. An elastic locking piece 15 made of pressure- and wear-resistant synthetic resin is bored along the axial direction and has a convex portion 14 integrally provided on the inner surface inside the elongated hole 13.
According to Jikkosho, the driver shaft 10 is fitted to prevent the driver shaft 10 from detaching from the grip body 1, and a protruding piece 5 for preventing rotation is provided along the axial direction on the outer circumferential wall of the metal tube 12. It was proposed as Publication No. 45-19031.

(Problems to be Solved by the Invention) However, according to the above-mentioned prior art, first, a metal tube 12 having a protruding piece 5 for preventing rotation on the outer peripheral wall is attached to the central hole 3 of the grip handle body 1. Since it only fits inside, the metal tube 12 may sink into the central hole 3 of the grip handle 1 more than necessary, or conversely come out of the central hole 3. The drawback was that when the screwdriver was turned, a strong force was applied and it was easily damaged.

Further, according to the conventional example, since the elastic locking piece 15 protrudes from a part of the inner surface of the central hole 3, when the driver shaft 10 is inserted, one end of the driver shaft 10 may get caught, making it difficult to insert the driver shaft 10. Additionally, there is an inconvenience that the driver shaft 10 is locked at an angle within the central hole 3, and even if the elastic locking piece 15 is made of a pressure- and wear-resistant synthetic resin, it cannot be used for a long period of time. In addition, since it is formed separately from the metal tube 12, it is not easy to work with.

(Means for Solving the Problems) In order to solve these problems, the present invention consists of a grip handle body 1 and a pipe 2 made of synthetic resin.
The grip handle body 1 has a tip end 1a to a tail end 1b.
A central hole 3 is provided along the axial direction into which the driver shaft 10 is freely inserted and supported, and the pipe 2 is fitted into the central hole 3, and the tip portion 2 of the pipe 2 is inserted into the central hole 3.
The tip end 1 of the grip handle body 1 is located at the opening edge 2a' of a.
A flange 4 is formed which contacts the opening edge 1a' of the pipe a, and a plurality of fitting grooves 9 are provided along the axial direction in the tip portion 2a, into which the protrusions 11 of the driver shaft 10 fit, and A plurality of cylindrical projecting pieces 5 are provided on the outer circumferential wall of the body part 2b of No. 2 along the axial direction in connection with the flange 4, and the projecting pieces 5 are cut out in the middle to form a cutout part 6, The grip handle body 1
a part of the member protrudingly engages with the cutout 6,
Further, a split groove 8 is provided in the tail end 2c of the pipe 2, and the tail end 2c is tapered to engage the driver shaft 10.

(Function) In the handle of the interchangeable screwdriver according to the present invention, when the pipe 2 is fitted into the central hole 3 of the handle body 1, the pipe 2 is attached to the tip opening edge 1a' of the handle body 1. The flange 4 of the two contacts.

Furthermore, since the plurality of protruding pieces 5 provided along the axial direction on the outer circumferential wall of the body portion 2b of the pipe 2 are each connected to the flange 4, their strength is increased and there is no risk of breakage. There's nothing to do. Furthermore, since the projecting piece 5 is cut out halfway, a part of the member of the grip handle main body 1 protrudes into the cutout part 6 and engages with it, resulting in a strong fitted state.

Further, since the tail end 2c of the pipe 2 is tapered and provided with a split groove 8, it expands when the driver shaft 10 is inserted and engages the driver shaft 10.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

FIG. 1 is an exploded perspective view of a grip handle of an interchangeable screwdriver according to the present invention, FIG. 2 is a cross-sectional side view of a main part thereof, and FIG. 3 is a cross-sectional view taken along the - line in FIG. 2.

In the figure, 1 is a grip body, 2 is a pipe, and 10 is a driver shaft.

The grip handle body 1 is a blind cylindrical body made of synthetic resin, and has a central hole 3 bored along the axial direction from its tip end 1a to its tail end 1b.

The pipe 2 is a cylindrical body made of synthetic resin, metal, etc., and its outer diameter is approximately the same size as the inner diameter of the central hole 3 of the grip body 1, and the tip portion 1a of the grip body 1 , and is fitted into the central hole 3 thereof.

The tip 2a of the pipe 2 has an opening edge 2
Along the axial direction from a', the driver shaft 10
A plurality of fitting grooves 9 into which the protrusions 11 fit are provided, and the flange 4 extends outward from the opening edge 2a'.
is formed. The flange 4 comes into contact with the opening edge 1a' of the tip 1a of the grip main body 1, and prevents the pipe 2 from sinking into the central hole 3 of the grip main body 1.

Next, a plurality of projecting pieces 5 each having a cutout part 6 are provided along the axial direction on the outer circumferential wall of the body part 2b of the pipe 2. A part of the member of the grip handle main body 1 projects and engages with the midway cutout 6 of the protruding piece 5. This prevents the pipe 2 from rotating within the central hole 3 of the grip handle body 1 and effectively prevents it from coming out of the central hole 3. Furthermore, the shoulder portions 7 of the protruding piece 5 are all formed in a rounded shape, so that the pipe 2 can be inserted into the central hole 3 of the grip handle body 1.
It is easy to fit into the handle body 1, and a part of the member of the grip handle body 1 is easy to come out. In the embodiment, after forming the pipe 2, the pipe 2 is fitted into the handle body 1 made of synthetic resin in an uncured state immediately after being taken out of the mold by injection molding, thereby forming the handle body. 1 contracts as a whole as it cools, and as a result, a part of the member of the grip handle body 1 protrudes and engages with the midway cutout 6 of the protruding piece 5 of the pipe 2, resulting in a firm fit. The state is obtained.

Further, in the embodiment, the protruding piece 5 and the flange 4 are connected, which increases the strength and prevents the protruding piece 5 from being damaged.

Further, the tail end 2c of the pipe 2 is provided with two grooves 8, 8, and the tail end 2c is formed in a tapered shape, making the tail end 2c expand and contract. . This allows the driver shaft 10
When inserting the pipe 2, the tail end 2c of the pipe 2
The inner surface divided by grooves 8 engages the outer surface of the driver shaft 10 from above and below, prevents it from freely detaching, and makes it easy to take out the driver shaft 10.

(Effects of the invention) Since the present invention has the above-described configuration, as shown in the figure, the flange 4 provided at the tip 2a of the pipe 2 allows the pipe 2 to extend over the grip body 1 more than necessary.
In addition, the protrusion piece 5 having a cutout part 6 provided in the body part 2b of the pipe 2, and the handle main body 1 provided in the body part 2b of the pipe 2, and the handle body 1 to the cutout part 6. Due to the protruding engagement of a part of the member, the pipe 2 is prevented from rotating in the central hole 3 of the handle body 1,
And it is possible to effectively prevent it from coming out of the central hole 3. Furthermore, the connection between the protruding piece 5 and the flange 4 increases the strength of this portion, and it is possible to prevent the protruding piece 5 from being damaged.

Also, when the driver shaft 10 is inserted into the handle of the present invention, at the tail end 2c of the pipe 2,
The inner surface divided by the groove 8 engages the outer surface of the driver shaft 10 from above and below, preventing it from freely detaching. In particular, the handle for a replacement screwdriver according to the present invention is more difficult to pull when inserting or removing the driver shaft 10 than the conventional example shown in FIG. 4, which uses an elastic locking piece made of synthetic resin. The driver shaft 10 can be operated smoothly without getting stuck, and the tail end 2c of the pipe 2 is evenly engaged from above and below.
There is no inconvenience caused by the locking being tilted. or,
Even if the inner surface of the tail end 2c of the pipe 2 is worn to some extent by use, it still has the ability to support the driver shaft 10 and can withstand long-term use. Furthermore, since the pipe 2 is integrally molded, it is extremely easy to work with and will not be damaged.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the handle of the interchangeable screwdriver according to the present invention, Fig. 2 is a cross-sectional side view of its main parts, Fig. 3 is a cross-sectional view taken along the - line in Fig. 2, and Fig. 4 is FIG. 2 is a sectional side view of a main part of a conventional example. 1...Grip handle body, (1a...Tip of the grip handle body,
1a'...the same opening edge, 1b...the body of the grip handle body),
2... Pipe, (2a... Tip of the pipe, 2
a'... Edge of the opening, 2b... Body of the pipe, 2c...
...same tail end), 3... central hole, 4... flange,
5... Protruding piece, 6... Midway cutout of the protruding piece, 7...
... Shoulder of protruding piece, 8 ... Division groove, 9 ... Fitting groove, 1
0...driver shaft, 11...same protrusion.

Claims (1)

[Scope of utility model registration request] It consists of a synthetic resin grip body 1 and a pipe 2, and the grip body 1 has a central hole into which a driver shaft 10 is freely inserted and supported along the axial direction from the tip end 1a to the tail end 1b. 3, and the central hole 3
The pipe 2 is fitted therein, and the opening edge 2a' of the tip 2a of the pipe 2 is formed with a flange 4 that comes into contact with the opening edge 1a' of the tip 1a of the grip handle body 1. The tip portion 2a is provided with a plurality of fitting grooves 9 along the axial direction into which the protrusions 11 of the driver shaft 10 are fitted, and the outer circumferential wall of the body portion 2b of the pipe 2 is provided with a plurality of fitting grooves 9 that are coupled to the flange 4. A plurality of protruding pieces 5 are provided along the axial direction, and the protruding pieces 5
is cut out in the middle to form a notch 6, a part of the member of the grip handle main body 1 is protruded and engaged with the notch 6, and the tail end 2c of the pipe 2 is further provided with a split groove. 8, and the tail end 2c is tapered to engage a driver shaft 10.