JPH06285771A - Impact wrench - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to an impact wrench, and an object of the present invention is to enable screw tightening and removing work in a narrow space. [Configuration] 1 is a housing, a battery 2 of a power source unit from a base end side, a switch 4 equipped with a rotation direction switching lever 3 for opening and closing a power source, and a lever 5 for operating the switch 4.
A motor 6 as a drive source, a speed change gear 7 and a bevel gear 8 for transmitting the rotation of the motor 6 are arranged on the axis, and a rotary impact is transmitted to the impact mechanism section 9 and the tip tool 10 on the tip side. The anvil 11 and the anvil 11 are arranged at a position perpendicular to the axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact wrench for tightening or removing screw parts.

[0002]

2. Description of the Related Art Conventional impact wrenches are actually fair 3-
As disclosed in Japanese Patent No. 44456, a main body portion including a motor portion of a drive source, a gear portion for reducing the rotation of the motor portion, and an impact mechanism portion is provided, and a handle portion is provided at a center of gravity of the main body portion. There is a T-shaped impact wrench located.

[0003]

[Problems to be Solved by the Invention] Actual fairness 3-44456
In the T-shaped impact wrench disclosed in Japanese Patent Laid-Open Publication No. 2004-242242, a drive source motor, a gear for decelerating the rotation of the motor, and an impact mechanism portion for rotationally striking a tip tool are axially arranged in a main body. Since the main body is made longer, the working range is limited and it is not possible to tighten and remove the screw in a narrow place. Therefore, an impact wrench with a short main body is required.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and improve the operability of the impact wrench.

[0005]

In order to achieve the above object, in an impact wrench of the present invention, a battery of a power source unit from a base end side, a switch equipped with a rotation direction switching lever for opening and closing a power source, and An lever for operating a switch, a motor as a drive source, a speed change gear for transmitting the rotation of the motor, and a bevel gear are arranged on an axis line, and an anvil for transmitting a rotary impact to an impact mechanism section and a tip tool on the tip side. Are arranged perpendicular to the axis. Further, the tip side can be made shorter by orienting the tooth surface of the bevel gear toward the impact mechanism section. In addition, the position of the lever that operates the switch that opens and closes the power supply is arranged at a substantially intermediate position between the proximal side and the distal side so that either the proximal side or the distal side can be grasped depending on the work content, and when grasping the distal side, Set the fulcrum to the power supply side so that the lever can be operated with a light force. Further, since the rotation direction switching lever mounted on the switch for opening and closing the power source is arranged along the outer circumference without largely protruding from the outer circumference of the housing, even if the user grasps the tip side, it can be operated without any trouble.

[0006]

[Operation] Of the impact wrench configured as described above,
In the rotation transmission method of tightening and removing the screw, the rotation of the motor is transmitted to the tip tool via the speed change gear, the bevel gear, the impact mechanism section and the anvil by pulling the lever and opening / closing the switch. In the rotation direction switching method, the power supply circuit is switched and the rotation direction is changed by moving the position of the rotation direction switching lever attached to the switch to the position in the reverse rotation direction.

[0007]

Embodiments of the present invention will be described with reference to FIGS. 1 is a housing, which is a battery 2 from the base end to the power source
A switch 4 for opening and closing a power source, which is equipped with a rotation direction switching lever 3 along the outer circumference of the housing 1, and a lever 5 having a power source side for operating the switch 4 as a fulcrum (A).
A drive source motor 6, a speed change gear 7 and a bevel gear 8 for transmitting the rotation of the motor 6 are embedded on the axis, and a rotary impact is transmitted to the impact mechanism 9 and the tip tool 10 on the tip side. The anvil 11 is embedded on the axis and at a right angle to the axis. To tighten the screw, attach the tip tool 10 to the anvil 11, align with the screw and lightly press the lever 5.
By pulling the switch 4 to open and close the switch 4, the rotation of the motor 6 causes the transmission gear 7, the bevel gear 8 and the known impact mechanism 9
When a constant tightening force is transmitted to the tip tool 10 via the anvil 11, the impact mechanism section 9 replaces the striking action and the tightening of the screw is completed. To remove the screw, the position of the rotation direction switching lever 3 attached to the switch 4 is moved to switch the power circuit (not shown) to change the rotation direction, and the tip tool 10 is attached to the anvil 11.
By pressing the lever 5 lightly in accordance with the screw and pulling the lever 5 to open and close the switch 4, the rotation of the motor 6 is opposite to the rotation of the tightening, and through the speed change gear 7, the bevel gear 8, the impact mechanism 9 and the anvil 11, the tip tool 10 is transmitted to the impact mechanism section 9 until it hits the tightening force of the attached screw, and when the tightening force is reduced, the screw action is replaced with the rotating operation and the screw removal is completed.

[0008]

According to the present invention, since the length of the front end side for tightening a screw can be shortened, the screw can be easily tightened and removed in a narrow space.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an impact wrench according to the present invention.

FIG. 2 is a bottom view of FIG.

3 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

1 is a housing, 2 is a battery for a power source, 3 is a switching lever, 4 is a switch, 5 is a lever, 6 is a motor, 7 is a reduction gear, 8 is a bevel gear, 9 is an impact mechanism, and 10 is a tip tool. , 11 are anvils.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Sakamoto 1060 Takeda, Katsuta City, Ibaraki Prefecture Hitachi Koki Engineering Co., Ltd.

Claims (4)

[Claims] 1. A shaft equipped with a switch for opening and closing a power source equipped with a rotation direction switching lever, a lever for operating the switch, a motor driven by the operation of the lever, and a speed change gear for transmitting the rotation of the motor. An impact wrench arranged on a line, wherein an impact mechanism section and an anvil that transmits a rotary impact to a tip tool are arranged at a position that is perpendicular to the axis. 2. The tooth surface of the bevel gear that transmits the rotation of the motor is directed toward the impact mechanism section.
Impact wrench described. 3. The impact wrench according to claim 1, wherein the position of the lever for operating the switch is arranged at a substantially intermediate position between the base end side and the front end side, and the position of the fulcrum is provided on the power source side. . 4. The impact wrench according to claim 1, wherein the rotation direction switching lever mounted on the switch is arranged along the outer periphery of the housing without largely protruding from the outer periphery of the housing.