ROTARY IMPACT TOOL

• US 20160075004A1
• Filed: 03/02/2015
• Published: 03/17/2016
• Est. Priority Date: 09/12/2014
• Status: Abandoned Application

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Tsubakimoto, Hiroyuki, Miyazaki, Hiroshi, OISHI, Ryohei
• Application Number:
  US14/634,947
• Publication Number:
  US 20160075004A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B25B 21/02 with means for imparting impact to screwdriver blade or nut socket
• CPC Class Codes: B25B 21/026 Impact clutches
• CPC Class Codes: H02P 6/10 Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
• CPC Class Codes: H02P 6/15 Controlling commutation time

Abstract

A rotary impact tool includes a spindle that has a rotary axis. An anvil is arranged coaxially with the rotary axis in front of the spindle. A main hammer is directly or indirectly coupled to the spindle. The main hammer is rotatable about the rotary axis and movable in the axial direction, and the main hammer is configured to engage and strike the anvil to rotate the anvil. A sub-hammer accommodates at least a portion of the main hammer and at least a portion of the spindle. The sub-hammer rotates integrally with the main hammer. A brushless motor rotates the spindle.

Claims

1. A rotary impact tool comprising:

a spindle including a rotary axis;

an anvil arranged coaxially with the rotary axis in front of the spindle;

a main hammer directly or indirectly coupled to the spindle, wherein the main hammer is rotatable about the rotary axis and movable in the axial direction, and the main hammer is configured to engage and strike the anvil to rotate the anvil;

a sub-hammer that accommodates at least a portion of the main hammer and at least a portion of the spindle, wherein the sub-hammer rotates integrally with the main hammer; and

a brushless motor that rotates the spindle.

2. The rotary impact tool according to claim 1, further comprising a rotation position detector that detects a rotation position of the brushless motor.

3. The rotary impact tool according to claim 1, further comprising a controller that controls the brushless motor, wherein the controller is configured to execute angle advancement control on the brushless motor.

4. The rotary impact tool according to claim 1, further comprising a controller that controls the brushless motor, wherein the controller is configured to execute conduction angle on the brushless motor.