Cordless fastening tool

Details Cordless fastening tool Cordless fastening tool

1997-05-09

1998-10-06

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

173176, B25B 2100

Patent

active

058161210

ABSTRACT:
A speed-increasing mechanism and a clutch mechanism are provided between a speed-reduction gear train and planetary gear trains, to realize a small-torque and high-speed rotation during a light load condition and a large-torque and low-speed rotation during a heavy load condition. A motor is actuated by a relay. An auxiliary motor switch, closing a contact of the relay, is provided at a motor housing to facilitate an operation of a shear wrench during a work where a bolt is fastened upward from below.

REFERENCES:
patent: 4215594 (1980-08-01), Workman, Jr., et al.
patent: 4883130 (1989-11-01), Dixon
patent: 5490439 (1996-02-01), Matsumura et al.

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