Power wrench

Details Power wrench Power wrench

1990-04-09

1990-10-30

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

173 12, 173163, B25B 23151

Patent

active

049660578

ABSTRACT:
The power wrench is provided with a coupling (14), switching dependent on the rotational moment and switching between a fast run mode and a load mode, when the rotational moment of the output exceeds a limit value. A distributing shaft (23) simulaneously drives two drive gears (26, 27). The output shaft (28) is pulled by a coupling member (32) that may be engaged to any one of said drive gears (26, 27). The coupling member (32) is prestressed by a spring (38) towards said first drive gear. At reaching the limit moment, the guiding member (40) shifts along the guide surface (39). This causes an axial movement of the coupling member (32) to disengage from said first drive gear (26) and to engage with said second drive gear (27).

REFERENCES:
patent: 4328871 (1982-05-01), Gluskin
patent: 4513827 (1985-04-01), Dubiel
patent: 4823885 (1989-04-01), Okumura

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