George R Hall

US Patent:

41065700, Aug 15, 1978

Filed:

Feb 7, 1977

Appl. No.:

5/766429

Inventors:

Siavash Eshghy - Pittsburgh PA
George D. Hall - Oakmont PA
Dennis R. Hammerle - Pittsburgh PA

Assignee:

Rockwell International Corporation - Pittsburgh PA

International Classification:

B23Q 5027

US Classification:

173 12

Abstract:

There is disclosed an air powered tool for applying torque to threaded fasteners and the like. The tool comprises a motor, a gear reducer and a driver whereby the motor turns at a higher rate than the driver. In order to provide better resolution of angle sensings, an angle sensor is arranged to determine rotation of the motor rather than of the driver. Because the fastener, driver, gear reducer and motor tend to torque up thereby producing an exaggerated reading for the angle of advance of the fastener, means are provided to compensate for the rotation sensing as a function of applied torque.

US Patent:

44270771, Jan 24, 1984

Filed:

Oct 25, 1979

Appl. No.:

6/088327

Inventors:

George D. Hall - Oakmont PA

Assignee:

Rockwell International Corporation - Pittsburgh PA

International Classification:

B25B 23145

US Classification:

173 12

Abstract:

A portable fastening tool of the type incorporating torque and angle sensors is connected to a data processor which analyzes the torque and angle sensings and generates a shut off signal to terminate tightening. The tool is powered and includes a fluid motor typically energized from a remote source of high pressure air. The data processor is energized by either a battery or an AC source. Termination of tool operation is effected by energizing a solenoid in response to a shut off signal generated by the data processor. In a battery operated embodiment, tool operation is initiated by manual depression of an operating lever while tool termination is effected automatically in response to the shut off signal. This mode of operation reduces the number of required batteries, prolongs battery life and reduces the number and size of electrical components in the tool.