Motors: expansible chamber type – Constantly applied motive fluid with controlled venting
Patent
1992-05-08
1995-01-03
Look, Edward K.
Motors: expansible chamber type
Constantly applied motive fluid with controlled venting
91 59, 60409, F15B 1302
Patent
active
053775783
ABSTRACT:
An air tool torque control system includes a controller operative to independently control two air tools with continuous programmed adjustment of the torque shut off point for each tool after each fastener joint is made. The torque specification is measured for each fastener joint made, is verified as being within an acceptable torque range, is compared to the set point of that torque specification range to determine the variation therebetween, and is then adjusted toward the mid point by the applicable correction factor for the variation determined to continuously compensate for variations in joint rate, line pressure and/or tool output. To enhance the effectiveness of the system, fast acting solenoid valves utilizing line pressure to assist in valve closure may be included to improve shut off control. Torque select devices may also be included at the assembly station to allow selective switching of each tool to preprogrammed discrete torque ranges for specific fastener applications performed at that station.
REFERENCES:
patent: 3473439 (1969-10-01), Bratt
patent: 3613509 (1969-10-01), Flasher et al.
patent: 4754776 (1988-07-01), McKee
Crane Electronics Advertisement.
Look Edward K.
Lopez F. Daniel
The Rotor Tool Company
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