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    • 5. 发明专利
    • DE69522363D1
    • 2001-10-04
    • DE69522363
    • 1995-04-24
    • BLACK & DECKER INC
    • DEFRANCESCO JNRKUNZ MICHAEL PELLIGSON DANIEL M
    • B25B21/02B25B23/14B25B23/147B25F5/00H02P7/29
    • An impact tool 10 having a speed limiting control circuit 22 to allow an operator of the tool to controllably limit the maximum speed of the tool to a predetermined value when a trigger 16 thereof is fully engaged. The impact tool includes a manually adjustable speed limiting control 20 protruding from an outer surface of the impact tool which is conveniently manually adjustable. The speed limiting control 20 is coupled to the wiper arm 24a of a speed limiting potentiometer 24 which is electrically coupled to a speed control circuit 22 within the impact tool. The speed limiting potentiometer 24 limits the maximum speed of the motor 26 of the impact tool (and thus the maximum torque which can be generated by the impact tool 10) to an operator selected percentage of the maximum motor speed which would otherwise be produced when the trigger is fully engaged. In the preferred embodiment the speed limiting potentiometer 24 is electrically coupled in series between a capacitor 40 and speed control potentiometer 36, which are each coupled to a 555 CMOS timer 34 which controls the duty cycle of a FET 50 used to drive the motor. The speed limiting potentiometer 24 enables the operator to further limit the maximum duty cycle of the output of the timer 340 which is a pulse-width-modulated like output, to a percentage of that which would otherwise be produced when the trigger is fully engaged.