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Striking tool

A technology of tools and drills, which is applied in the direction of striking tools, light impact tools, manufacturing tools, etc., to achieve the effect of reducing torque load, reducing torque in the direction of striking, and increasing the degree of freedom

Active Publication Date: 2014-12-31
MAKITA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the clutch needs to be enlarged in order to be able to transmit high torque, and there is still room for improvement in this respect

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0034] Below, refer to Figure 1 to Figure 5 The first embodiment of the present invention will be described in detail. The first embodiment corresponds to technical solution 1 of the present invention. As an example of a driving tool, an electric hammer drill will be described. like figure 1 and figure 2 As shown, in general, the main body of the hammer drill 101 according to this embodiment is composed of: a main body part 103 forming the outline of the hammer drill 101; a hammer drill bit 119 through a hollow shape The drill bit clip 137 is installed on the end area (left side of the figure) of the main body 103 in a detachable manner; hold. The hammer bit 119 is held by the bit holder 137 so as to be able to move relatively linearly in the direction of its long axis. The main body portion 103 corresponds to a "tool main body" in the present invention, and the hammer bit 119 corresponds to a "tool bit" in the present invention. However, for convenience of description,...

no. 2 approach

[0065] Next, refer to Image 6 and Figure 7 A second embodiment of the present invention will be described. This embodiment is a modified example related to the arrangement of the electromagnetic clutch 134 , and corresponds to claim 2 . In this embodiment, the structure in which the electromagnetic clutch 134 is arrange|positioned on the output shaft 111a of the drive motor 111 is employ|adopted.

[0066] like Figure 7 As shown, the electromagnetic clutch 134 has a driving-side rotating member 181 and a driven-side rotating member 183 disposed in opposite shapes in the long-axis direction. The shaft portion (boss portion) 181a of the driving-side rotating member 181 is fixedly mounted on the output shaft 111a and It is integrated with this output shaft 111a, and the shaft part (boss part) 183a of the driven side rotating member 183 is fitted in the outer side of the output shaft 111a so that relative rotation is free. In addition, the driven-side rotating member 183 is ...

Embodiment approach 1

[0079] The hammering tool according to claim 1, wherein the path for transmitting the torque of the motor to the tool bit includes a hammering drive system that linearly drives the tool bit along the long-axis direction, and a drive system that drives the tool bit linearly. The rotary drive system in which the tool bit rotates around the long axis, and the clutch is configured in the rotary drive system.

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PUM

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Abstract

Disclosed is a striking tool technology that contributes to reducing clutch sizes. The striking tool causes a tool bit (119) to perform a striking operation in the long axis direction and to perform a rotational operation about the long axis, thereby causing the tool bit (119) to carry out a predetermined machining operation. The striking tool comprises a tool body (103); a motor (111) which is housed in the tool body (103) and drives the tool bit (119); and a clutch (134) which, on a route where the torque of the motor (111) is transmitted to the tool bit (119), is disposed in a high rotational speed and low torque region that is a stage prior to where the rotational speed of the motor (111) is reduced, which transmits the torque of the motor (111) to the tool bit (119) in a normal state, and which cuts off the transmission of torque generated about the tool bit long axis in the tool body (103) if the torque exceeds a predetermined torque level.

Description

technical field [0001] The present invention relates to a striking tool capable of preventing excessive reactive torque from acting on the tool body when the tool bit is accidentally locked. Background technique [0002] U.S. Application Publication No. 2007-0289759 specification (Patent Document 1) discloses a hammer drill in which a clutch is arranged in a power transmission mechanism that transmits the torque of the motor to the tool bit. During locking, the torque transmission from the motor to the tool bit is blocked by the clutch, thereby preventing excessive torque in the direction opposite to the rotation direction of the hammer bit, that is, reaction torque from acting on the tool body side. [0003] In the technique for preventing the reaction torque described in the above publication, a clutch is provided in the power transmission mechanism that decelerates the rotational speed of the motor. Therefore, the size of the clutch is increased in order to be able to tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25D17/10B25D16/00
CPCB25D2216/0069B25D2250/165B25D16/006B25D2250/255B25D2216/0023B25D2211/068B25D2250/145B25D16/003B25D2216/0015
Inventor 青木阳之介
Owner MAKITA CORP