Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1975-09-29
1977-05-17
Cohen, Irwin C.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
91 59, 91435, 91458, B23Q 506, F01C 2112
Patent
active
040236277
ABSTRACT:
This invention relates to power tools and more particularly to an air-operated power tool commonly used for automotive or other assembly operations for installing threaded fasteners. The device of this invention shuts off the power tool as it approaches the stall condition. Motor rotation is sensed by transferring a small mass of air in proportion to the speed of the motor but independent of the air expanded to operate the motor. The air transferred is utilized to create a signal which through an air-operated valve shuts the power tool off when the speed is reduced below a predetermined amount as when the torquing cycle is nearing completion.
REFERENCES:
patent: 1414168 (1922-04-01), Bayles et al.
patent: 3406762 (1968-10-01), Kramer
patent: 3473439 (1969-10-01), Bratt
patent: 3608131 (1971-09-01), Hornschuch et al.
patent: 3656560 (1972-04-01), Chatterfeld et al.
Clapp John Madison
Pauley Reginald William
Cohen Irwin C.
Ingersoll-Rand Company
Vliet Walter C.
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