JPH0680564U - Power tool driver bit holding mechanism - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to hold a driver bit in a hole holding a chuck key in an electric tool equipped with a keyless chuck. [Structure] A bit holder 6 having two circular arms 6b and 6c for holding a driver bit 7 is housed in a cylindrical boss 3 so as not to fall off by the ribs 4a of the split housings 1 and 2. Driver bit holding mechanism for power tools.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a driver bit holding mechanism for an electric power tool that grips a tip tool by a chuck like a battery driver drill.

[0002]

[Prior art]

 In electric power tools, driver drills in particular hold the tip tool with a chuck. Currently, the chuck requires a chuck key to remove the tip tool (hereinafter referred to as a keyed chuck) and the tip tool without the chuck key. It is typified by two types that can be removed by hand (hereinafter referred to as a keyless chuck). Recently, due to diversifying needs, even for the same main body, many customers who prioritize price want a product with a keyed chuck, and those who prioritize functions want a product with a keyless chuck. It has become to. To meet this demand, the chuck key holding mechanism, which is necessary when the keyed chuck is attached, becomes unnecessary when the keyless chuck is attached. However, in the case of a tool that uses an AC power supply, since the cord holds the chuck key with a vinyl band, it does not matter much if either of the above two types of chucks is attached. However, a battery tool that uses a storage battery as a power source does not have a cord, so a chuck key holding mechanism must be provided in the driver drill body.

A chuck key holding mechanism of a conventional battery driver drill is shown in FIGS. The housings 1 and 2 are of a split type, and the housing 1 is formed with a cylindrical boss 3. A hole 4 is formed in the housing 2 so as to be in the same position as the boss 3. The rib 4a of this hole 4 prevents the leaf spring 9 housed in the boss 3 from falling off. When the chuck key 10 is inserted into the hole 4 of the housing 2, the chuck key 10 is held by the plate panel 9. However, when the chuck 8 with a key was changed to the keyless chuck 5 in this main body, the use of the hole 4 was lost.

[0004]

[Problems to be solved by the device]

 The conventional chuck key holding mechanism loses its application when the keyless chuck 5 is mounted. Then, since the hole 4 opened in the housing 2 is exposed, there is a problem that the appearance of the main body is greatly impaired. In particular, the product with the keyless chuck 5 was a great pain because the customer demanded it as a luxury product.

Further, in order to eliminate this drawback, when 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 with the piece 11, there is a problem that the shape and the bonding method of the piece 11 are difficult because the appearance is impaired unless they are integrated with the outer peripheral shape.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide an added value at a low cost to a hole for holding a chuck key even when a keyless chuck is attached.

[0007]

[Means for Solving the Problems]

 The purpose of the above is to store the bit holder, which has two circular arms that hold the driver bit and is made of an elastic body, in the cylindrical boss so that it will not fall off due to the ribs of the nut split type housing. To be achieved.

[0008]

[Action]

 The bit holder configured 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]

【Example】

 An embodiment of the present invention is shown in FIGS.

In the figure, the housings 1 and 2 are of a split type, and a cylindrical boss 3 is formed in the housing 1. A hole 4 is provided in the housing 2 so as to come to 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 rib 4 a of the hole 4 prevents the bit holder 6 from falling off the housing 2. 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 is provided with two arms 6b and 6c. Since 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, the driver bit 7 is sufficient. It can be held and the driver bit 7 can be attached and removed freely. On the other hand, when the keyed chuck 8 is mounted, the leaf spring 9 is housed in the boss 3 and the chuck key 10 can be held.

[0012]

[Effect of device]

 According to the present invention, when the keyless chuck is attached, the driver bit can be held by using the hole of the main body that was holding the chuck key. There is nothing to be told. Moreover, new features not available in products with keyed chucks can be added to products with keyless chucks that customers demand as high-end products. Furthermore, since this bit holder is easy in shape and mounting method, it can be added value at low cost.

[Brief description of drawings]

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

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

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

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,
Reference numeral 9 is a leaf spring, and 10 is a chuck key.

Claims (1)

[Scope of utility model registration request] 1. A power tool equipped with a keyed chuck for attaching and detaching a tip tool to and from a power tool body, and a power tool equipped with a keyless chuck for attaching and detaching a tip tool to and from the power tool body. When a chuck with a key is attached by forming a hole in the main body, an elastic body for holding the chuck key is stored in the hole, and when the keyless chuck is attached, a driver bit is held in the hole. A driver bit holding mechanism for an electric tool, which is characterized by accommodating an elastic body.