JPH04365563A - Bit attaching tool - Google Patents

Abstract

PURPOSE:To suit a pit attaching tool to all kinds of bits by attaching a piece, having thickness responding to a difference in size extending from the engaging groove of a bit to the tip thereof, to the deep wall of a chuck formed to the tip of a main shaft. CONSTITUTION:When a bit 4 is attached to a chuck 3, a ball 6 is engaged with an engaging groove 5 of the bit 4. In this case, a tip 9 of the bit 4 is brought into contact with a deep wall 10 of the chuck 3 to prevent the occurrence of a backlash of the bit 4. In this case, when a size extending from the engaging groove 5 to the tip 9 of the bit 4 is short, the tip 9 is not brought into contact with the deep wall 10 and a backlash occurs to the bit 4. Thereby, a piece 11 matching with the size difference is attached to a deep wall 10 part and the tip 9 is brought into contact with the piece 11 to stabilize the bit 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention of this application relates to a tool that has a chuck formed at the tip of a main shaft and allows a bit to be detachably mounted thereon.

0002

2. Description of the Related Art Tools for installing bits include electric screwdrivers, pneumatic hammer drive screwdrivers, impact wrenches, impulse wrenches, and the like. A chuck is formed at the tip of the main shaft of these tools, and various bits can be detachably attached thereto.

On the other hand, there are a plurality of types of bits that differ in dimension from the mounting groove to the tip. Therefore, the tool is formed with a chuck that corresponds to the type of bit to be mounted.

0004

Problems to be Solved by the Invention Since a tool is formed with a chuck that corresponds to the type of bit to be mounted, the types of chucks are multiplied depending on the type of bit. Therefore,
There were many types of tools, and inventory management was complicated. Additionally, if there was an order for a type of tool that was not in stock, the entire main shaft forming the chuck had to be replaced. Replacing the main shaft required time-consuming disassembly and assembly work.

[0005]The invention of this application therefore aims to provide a bit mounting tool that solves the above-mentioned problems.

[0006]

[Means for Solving the Problems] In the invention of this application, the back wall 10 of the chuck 3 formed at the tip of the main shaft 2
The bit mounting tool is provided with a piece 11 having a length corresponding to the dimensional difference from the fitting groove 5 to the tip 9 of the bit 4. In claim 2, the piece 11 according to claim 1,
A recess 15 into which the tip 9 of the bit 4 is inserted is formed.

[0007] In claim 3, the piece 11 according to claim 1
, a flat contact surface 1 that contacts the rear end 9a of the bit 4
7 was formed. In claim 4, the piece 1 according to claim 1
An O-ring 13 is provided on the outer periphery of 1 to prevent it from coming off.

[0008]

[Operations] The invention of this application has the following functions. Fitting groove 5
The chuck 3 is formed to match the bit 4 with the largest dimension from the top to the tip 9, and when using a different type of bit, pieces 11 are attached to the back wall 10 of the chuck 3 according to the size difference. Therefore, only one type of chuck 3 is required.

The shape of the surface of the piece 11 that comes into contact with the bit 4 may be formed in accordance with the shape of the bit 4, and the recess 15 may be formed as in claim 2, or as in claim 3. The contact surface 17 may be formed in a planar shape. piece 1
1 may be provided with an O-ring 13 as in claim 4 to prevent it from easily slipping out from the back wall 10 of the chuck 3.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the invention of this application will be explained below with reference to the drawings. Although this embodiment will be explained using an impulse wrench, it can be implemented not only with an impulse wrench but also with any tool that attaches a bit. In Figure 1,
Reference numeral 1 denotes an impulse wrench, which includes a chuck 3 at the tip of a main shaft 2. A bit 4 shown in FIG. 4 is attached to the chuck 3.

FIG. 2 is a partially enlarged view of the chuck 3 of FIG. 1. When the bit 4 is attached to the chuck 3, the ball 6 fits into the fitting groove 5 of the bit 4, and the bit 4 is prevented from coming out from the chuck 3. To remove the bit 4 from the chuck 3, move the ring 7 of the chuck 3 forward and move the ball 6 between the main shaft 2 and the ring 7.
All you have to do is move it to the gap 8 between.

The tip 9 of the bit 4 is attached to the back wall 1 of the chuck 3.
0 and prevents bit 4 from wobbling. FIG. 3 shows a state in which the bit 4 shown in FIG. 5 is attached to this tool. Bit 4 shown in this figure 5
Compared to the bit shown in FIG. 4, the distance from the fitting groove 5 to the tip 9 is
Since the length up to the tip is short, the tip 9 of the bit 4 will not come into contact with the back wall 10 of the chuck 3 if it continues as it is, and the bit 4
is rattling. Therefore, a piece 11 is attached to the back wall 10 of the chuck 3 to compensate for the dimensional difference.

FIG. 7 is an enlarged partially cutaway front view of the piece 11. The piece 11 is formed in a cylindrical shape, and the small diameter portion 12 is press-fitted into the back wall 10 of the chuck 3. The attachment method is not limited to press-fitting, and as shown in FIG. 8, an O-ring 13 may be fitted in the small diameter portion 12 to prevent it from coming off due to friction with the back wall 10. A hole 15 into which the tip 9 of the bit 4 is inserted is formed in the large diameter portion 14 to prevent the tip 9 of the bit 4 from being damaged by pressure.

When using a bit that is used only on one side, as shown in FIG. 6, the piece 11 does not have a hole 15, but has a flat contact surface 17 as shown in FIG.
It's good as well. Furthermore, if the piece 11 needs to be replaced, a through hole 16 as shown in FIG. 10 may be provided so that the piece 11 can be pulled out by hooking the side surface 17 on the rear end side with a hook-shaped object.

FIG. 11 shows an example in which the tapered portion between the large diameter portion 13 and the small diameter portion 12 is eliminated.

[0016]

[Effects of the Invention] The invention of this application has the above-mentioned configuration, and produces one type of tool with a chuck 3 that fits the bit 4 having the largest dimension from the fitting groove 5 to the tip 9. If you keep it in place, you can fit all types of bits 4 just by installing the piece 11 inside the chuck 3.
Inventory management has become easier.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view of a bit mounting tool according to the present invention.

FIG. 2 is a partially enlarged sectional view of FIG. 1;

FIG. 3 is an enlarged partially cutaway sectional view showing a state in which the piece is attached.

FIG. 4 is a front view of a bit with a long dimension from the fitting groove to the tip.

FIG. 5 is a front view of a bit with a short dimension from the fitting groove to the tip.

FIG. 6 is a front view of a type of bit in which only one end is used.

FIG. 7 is a partially cutaway front view of the piece.

FIG. 8 is a partially cutaway front view showing another embodiment of the piece.

FIG. 9 is a partially cutaway front view showing another embodiment of the piece.

FIG. 10 is a partially cutaway front view showing another embodiment of the piece.

FIG. 11 is a partially cutaway front view showing another embodiment of the piece.

[Explanation of symbols]

1 Bit installation tool 2 Main shaft 3 Chuck 4 bits 5 Fitting groove 9 Tip 9a rear end 10 Back wall 13 O-ring 15 Hollow 17. Hit side

Claims (4)

[Claims] Claim 1: A part of the bit 4 from the fitting groove 5 to the tip 9 is formed on the back wall 10 of the chuck 3 formed at the tip of the main shaft 2.
A bit mounting tool characterized in that a piece 11 of a length corresponding to the dimensional difference up to the length is attached. 2. Claim 1, characterized in that the piece 11 is formed with a recess 15 into which the tip 9 of the bit 4 is inserted.
Bit installation tool as described. 3. The bit mounting tool according to claim 1, wherein the piece 11 is formed with a planar contact surface 17 that contacts the rear end 9a of the bit 4. [Claim 4] On the outer periphery of the piece 11, there is an O to prevent it from coming off.
The bit setting tool according to claim 1, 2 or 3, further comprising a ring (13).