JP2000254869A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make one battery tool cope with various point tools by comprising a female screw of a driver chuck having a hexagon hole. SOLUTION: A driver bit is inserted into a hexagon hole 3 formed on a socket 1, and the stepped longitudinal holes for mounting two steel balls 4 are formed on the parts corresponding to the driver bit holding grooves of the driver bit holding groove on a position where the driver bit collides with a bottom. A spring 7 is energized by a washer 9 and a ring 8 to press a guide sleeve 5 at an outer peripheral part of the socket 1. The steel balls 4 are engaged with the driver bit holding grooves by the guide sleeve 5. A 1/2-UNF 20 screw 2 is formed on the socket 1. A 1/2-20 UNF male screw 15 is formed on a spindle 11 for transmitting the output from a decelerator. The 1/2-UNF 20 male screw of the spindle 1 is engaged with the 1/2-20 UNF female screw 2 formed on the socket 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power tool having a tip tool holding portion.

[0002]

2. Description of the Related Art A conventional driver chuck will be described with reference to FIG.

FIG. 3 shows a tip of a battery tool integrated with a driver chuck. The output from the reduction unit 19 is transmitted to the spindle 20. A hexagonal hole 21 for inserting a tip tool is provided inside the spindle 20. The driver bit pulls the guide sleeve 22 in the direction opposite to the main body while urging the spring 16 so that the steel ball 17 can move into the groove 18 of the guide sleeve 22 and can be inserted. If the guide sleeve 22 is released after the driver bit is inserted, the guide sleeve 22 is released by the urging force of the spring 16.
Is returned toward the main body, and the steel ball 17 is moved to the groove of the driver bit to hold the driver bit. However, when using a tip tool that does not have a hexagon,
Another tool had to be used.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to use a driver chuck for easily attaching and detaching a tip tool when using a tip tool having a hexagonal portion, and to use a tip tool having a round portion when using a tip tool having a round portion. It is an object of the present invention to provide a battery tool with good operability that can use a drill chuck so that one battery tool can be used for various tip tools.

[0005]

The above object is achieved by providing a female chuck of 3 / 8-24UNF or 1 / 2-20UNF in a driver chuck having a hexagonal hole for inserting a tip tool having a hexagonal portion.

[0006]

FIG. 1 shows an embodiment of a driver chuck according to the present invention.

[0007] A hexagonal hole 3 is formed in the socket 1. A driver bit is inserted into the hexagonal hole 3, and two steel balls are provided at a position where the driver bit is abutted against the bottom and aligned with the groove for holding the driver bit. A stepped vertical hole for arranging 4 is drilled. A spring 7 is urged by a washer 9 and a ring 8 against the outer peripheral portion of the socket 1 to press the guide sleeve 5. The steel balls 4 are engaged with the holding grooves of the driver bits by the guide sleeves 5. In addition, the socket 1 has a 1/2 UNF20
Are formed.

Referring to FIG. 2, the attachment of the driver chuck of the present invention to a battery tool will be described.

A 1 / 2-20 UNF male screw 15 is formed on the spindle 11 for transmitting the output from the speed reducer 14.
1/2 provided on the socket 1 of the driver chuck of the present invention.
-20 1/2 of spindle 1 by UNF female thread 2
Engage with UNF20 male thread. A tool such as a wrench is attached to the flat surface portion 10 on the outer periphery of the socket 1 and attached and removed.

The drill chuck 13 also has 1 / 2-20 UN.
Since the F female thread 12 is formed, the drill chuck 13 can be attached to the spindle 11 by removing the socket 1 from the spindle 11.

[0011]

According to the present invention, the driver chuck can be easily attached / detached, and when many tip tools having mainly hexagonal parts are used, the driver chuck which can be attached / detached with one touch is used. When a large number of batteries are used, it is possible to use a drill chuck with one battery tool.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a driver chuck according to the present invention.

FIG. 2 is a view showing how a driver chuck and a drill chuck according to the present invention are mounted.

FIG. 3 is a longitudinal sectional view of a battery tool equipped with a conventional driver chuck.

[Explanation of symbols]

1 is a socket, 2 is a screw part, 3 is a hexagonal hole, 4 is a steel ball, 5 is a guide sleeve, 6 is a groove, 7 is a spring, 8 is a ring, 9 is a washer, and 10 is a flat part.

Claims (2)

[Claims] 1. A hexagonal hole for inserting a tool bit such as a driver bit therein is provided therein, and a hole for disposing a steel ball for retaining the driver bit by engaging with a groove for holding the driver bit is provided on the outer periphery. A driver chuck comprising: a socket having an inner diameter portion for preventing the steel ball from projecting outside the socket; and a guide sleeve having an escape groove when the steel ball projects.
A power tool characterized in that a female screw portion of 3 / 8-24UNF or 1 / 2-20UNF is provided inside the socket coaxially with the hexagonal hole of the socket. 2. The power tool according to claim 1, wherein opposed flat portions are provided on an outer periphery of the socket.