Hand-held power screwdriver with a low-noise torque clutch

Details Hand-held power screwdriver with a low-noise torque clutch Hand-held power screwdriver with a low-noise torque clutch

2006-11-21

2006-11-21

Wilson, Lee D. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

C081S473000, C081S429000

Reexamination Certificate

active

07137324

ABSTRACT:
A hand-held power screwdriver includes a low-noise torque clutch (5) for transmitting torque to a tool spindle (4) and formed of claw clutch (6) and ratchet clutch (7), with the ratchet clutch (7) having a rotatably driven first ratchet member (7a) and a second ratchet member (7b) both having, respectively, oppositely oriented, circumferentially arranged, oblique cams (9), with the claw clutch (6) having a first claw member (6a) and a second claw member (6b) having oppositely oriented claws (11), respectively, the first claw member (6a) of the claw clutch (6) being fixedly connected with the second ratchet member (7b) of the ratchet clutch (7) for joint rotation therewith, and with the screwdriver further including at least one engagement member (12) for connecting the second claw member (6b) with the tool spindle (4) for joint rotation therewith and for disconnecting the claw member (6b) from the tool spindle (4) and a retaining element for connecting the second claw member (6b) of the claw clutch (6) with the tool spindle (4) in a free-running position.

REFERENCES:
patent: 4650007 (1987-03-01), Fujita et al.
patent: 4842078 (1989-06-01), Hansson
patent: 5538089 (1996-07-01), Sanford
patent: 5775186 (1998-07-01), Rahm
patent: 6739225 (2004-05-01), Bader et al.
patent: 6851343 (2005-02-01), Sasaki
patent: 6892611 (2005-05-01), Sasaki
patent: 2003/0110910 (2003-06-01), Bader et al.

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