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Electric rotational tool driving switch system

  • US 6,923,268 B2
  • Filed: 02/20/2002
  • Issued: 08/02/2005
  • Est. Priority Date: 02/28/2001
  • Status: Expired due to Term
First Claim
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1. An electric rotational tool driving switch system characterized in that said electric rotational tool is comprised of an electric motor, a rotational tool, such as a driver bit, etc., which is connected to an output shaft of said electric motor and which performs work, such as tightening of screws, etc., a driving switch which initiates said work performed by said rotational tool by driving said electric motor, a torque detection means which detects a load torque generated in said rotational tool when said work is completed, and a torque-set automatic stopping means which stops driving of said rotational tool when said load torque reaches a preset torque value, whereina driving switch of a push operating system, which switches said electric motor ON when said rotational tool is caused to contact a work object such as a screw, etc. and displaced by being pressed, and a driving switch of a lever operating system, which switches said electric motor ON when a switch lever installed in a grip portion of said electric rotational tool is displaced by being pressed, are respectively constructed by combining magnets and magnetic sensors;

  • and said magnetic sensors are respectively connected to a power circuit of said electric motor so that either one of said operating systems is selected, and driving of said electric motor is initiated by switching said power circuit ON through magnetism sensing action of said magnetic sensor of a selected operating system.

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