B - Operations – Transporting – 23 – P
Patent
B - Operations, Transporting
23
P
121/6
B23P 19/06 (2006.01) B25B 23/145 (2006.01) F01C 13/02 (2006.01)
Patent
CA 1090215
ABSTRACT OF THE DISCLOSURE A two-speed pneumatically powered rotary nut runner having an auxiliary motor, and a main motor axially offset from the auxiliary motor and being drivingly connected thereto by a reduction gear cage. An output spindle is provided for engagement with a drive shank for setting of a threaded fastener, and an intermediate spindle, drivingly connected to the auxiliary motor, is coupled to the output spindle by plane- tary gears. A torque signal assembly is operatively associated with the main motor and is operative upon reverse rotation of the main motor to generate a pneumatic signal indicative of such reverse rotation Reverse rotation of the main motor is caused by the auxiliary motor when it has exerted predetermined final torque upon the threaded fastener. The fact that the main motor is axially offset from the auxiliary motor, allows the rotor of the main motor to be of smaller diameter. This, coupled with reduced speed of rotation of the reduction gear cage by reason of a spur gear coupling with the main motor output shaft, provides a reduction in kinetic energy at lower torque values without errors in torque readings because of stored energy in the rotating parts.
314008
Chicago Pneumatic Tool Company
Fetherstonhaugh & Co.
LandOfFree
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