Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1989-02-06
1989-12-12
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5744, 811762, B25B 1700
Patent
active
048859621
ABSTRACT:
An air driven torque wrench adaptable to turn spoked handwheels of a wide variety of large valves to effect opening and closing of such. The wrench mechanism includes a head portion, central air turbine wheel which is rotated by air flow and forced in either a clockwise or counter-clockwise direction. The air turbine wheel has gear teeth on its outer periphery which drive a number of meshing spur gears located in uniformly spaced position about the turbine wheel. The spur gears in turn drive an outer annular gear wheel or ring, having inner peripheral gear teeth which mesh with and are driven by rotation of the spur gears. The annular gear wheel includes in its outer periphery a bearing race or track which mates with an outer annular bearing race affixed to and supported by the outer wrench head housing, the two mating bearing races enclosing a series of bearings maintained in equally spaced position by a bearing frame between the races. Air inlets associated with the wrench head section deliver air under pressure to the turbine wheel to rotate same and thereby rotate with increased force the annular gear ring. A wrench handle section extends outwardly from the wrench head housing. Drive lugs mounted to the underside of the annular gear ring interact with and drive a circular torque plate which has grip elements for removable attachment to the spokes of valve handwheels.
REFERENCES:
patent: 983562 (1911-02-01), Murray
patent: 2402477 (1946-06-01), Williams
patent: 2634630 (1953-04-01), Johnson
patent: 3992964 (1976-11-01), Osmond
Junkins Philip D.
Smith James G.
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