JP2595548Y2 - Power tool driver bit holding mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driver bit holding mechanism for a power tool which holds a tool bit with a chuck like a battery driver drill.

[0002]

2. Description of the Related Art In a power tool, in particular, a driver drill grips a tip tool with a chuck, and the chuck currently uses a chuck key and a type that requires a chuck key to remove the tip tool (hereinafter referred to as a keyed chuck). And two types of types (hereafter referred to as keyless chucks) that can completely remove the tip tool by hand. Recently, with the diversification of needs, even for the same main body, customers who prioritize price often want products with keyed chucks, and customers who prioritize functions want products with keyless chucks. Is coming. In order to meet this demand, a chuck key holding mechanism required when a keyed chuck is mounted becomes unnecessary when a keyless chuck is mounted.
However, in the case of a tool that uses an AC power supply, since the cord holds the chuck key with a vinyl band,
Either type of chuck is not a big problem. However, in a battery tool using a storage battery as a power source, there is no cord, and thus a chuck key holding mechanism must be provided in the driver drill body.

FIGS. 3 and 4 show a chuck key holding mechanism of a conventional battery driver drill. The housings 1 and 2 are of a split type, and a cylindrical boss 3 is formed on the housing 1. The housing 2 has the boss 3
A hole 4 is provided at the same position as that of FIG. The rib 4a of the hole 4 prevents the leaf spring 9 housed in the boss 3 from falling off. Insert chuck key 10 into hole 4 of housing 2
Is held by the leaf spring 9. However, when the keyed chuck 8 is changed to the keyless chuck 5 in this main body, the use of the hole 4 has been lost.

[0004]

The conventional chuck key holding mechanism loses its use when the keyless chuck 5 is mounted. And a hole 4 in the housing 2
However, there is a problem that the appearance of the main body is greatly impaired due to the exposure. In particular, the products with the keyless chuck 5 have been a big hit because customers are demanding them as luxury products.

[0005] In order to eliminate this drawback, if a housing corresponding to each chuck is newly provided, a large amount of mold cost is required. Further, as shown in FIG. 5, when the hole 4 is closed by the piece 11, the appearance is impaired if the hole 4 is not integrated with the outer peripheral shape, so that there is a problem that the shape and the bonding method of the piece 11 are difficult.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art and to provide a hole for holding a chuck key with added value even when a keyless chuck is attached.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent a bit holder having two circular arms for holding a driver bit and formed of an elastic body from being dropped by a rib of a split type housing. Achieved by housing in a cylindrical boss.

[0008]

The bit holder constructed as described above can hold the driver bit because the inner diameter formed by the two arms is slightly smaller than the outer diameter of the driver bit.

[0009]

1 to 4 show an embodiment of the present invention.

In the figure, the housings 1 and 2 are of a split type, and the housing 1 is formed with a cylindrical boss 3. The housing 2 is provided with a hole 4 at the same position as the boss 3.

When the keyless chuck 5 is mounted, the bit holder 6 is housed in the boss 3 and the hole 4
The bit holder 6 does not fall off the housing 2 by the rib 4a. The bit holder 6 is formed of an elastic material such as rubber or plastic, and has a driver bit holding portion 6a at one end. The driver bit holding portion 6a has two arms 6b and 6c, and the inner diameter A formed by the two arms 6b and 6c is slightly smaller than the outer diameter B of the driver bit 7, so that the driver bit 7 is sufficiently held. The driver bit 7 can be freely attached and detached. On the other hand, when the keyed chuck 8 is mounted, the leaf spring 9 is housed in the boss 3 so that the chuck key 10 can be held.

[0012]

According to the present invention, when a keyless chuck is attached, a driver bit can be held by using the hole of the main body holding the chuck key, so that a useless hole is exposed in the housing. The appearance is not impaired. In addition, new functions not available in products with keyed chucks can be added to products with keyless chucks that customers demand as luxury products. Further, since the bit holder is easy in shape and mounting method, it can provide added value at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a battery driver drill with a keyless chuck showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II of FIG. 1;

FIG. 3 is a perspective view of a battery driver drill to which a keyed chuck according to an embodiment of the present invention is attached.

FIG. 4 is a sectional view taken along line II-II of FIG.

FIG. 5 is a perspective view showing an example of a conventional battery driver drill with a keyless chuck.

[Explanation of symbols]

In the figure, 4 is a hole, 5 is a keyless chuck, 6 is a bit holder, 7 is a driver bit, 8 is a chuck with a key,
9 is a leaf spring and 10 is a chuck key.

Claims (1)

(57) [Scope of request for utility model registration] 1. An electric tool having a keyed chuck for attaching and detaching a tip tool from an electric tool body, and an electric tool having a keyless chuck for attaching and detaching a tip tool from the electric tool body. When a hole is provided in the main body and the chuck with a key is attached, an elastic body for holding a chuck key is stored in the hole, and when the keyless chuck is attached, a driver bit is held in the hole. A power tool driver bit holding mechanism containing an elastic body.