Impact air wrench having a two position pressure regulator
AssigneeChicago Pneumatic Tool Company
InventorsWilliam K. Wallace, Arthur E. Lammens
Life of this patent
Estimating the term…
Abstract
A pneumatically powered impact wrench having a two position pressure regulator located in a back cap of the housing between a reverse valve and a reversible air driven motor, the regulator being adapted in a selected first position to cause application of full air pressure to the motor and a consequent full torque to the work in a direction as determined by the reverse valve, and to cause application in a second selected position of reduced air pressure to the motor and a consequent torque of a predetermined lesser value to the motor in an opposite direction.
Claims3
A pneumatically powered nut running tool comprising an air driven torque transmitting reversible motor, a throttle valve for admitting supply air to the tool to drive the motor, a reversible valve selectively manipulative to guide air from the throttle valve to drive the motor in either a forward or reverse direction;
- pressure air regulator means manipulative to a first position for conducting air from the reverse valve at full pressure to the motor, and manipulative to a second position for causing air from the reverse valve to flow at a regulated predetermined reduced pressure to the motor;
- and a cap closing over a back end of the housing of the tool in which cap the regulator means is housed;
- wherein a bore in the cap has a first inlet port connected with a forward flow groove of the reverse valve and has a first outlet port connected with a forward directional area of the motor;
- wherein the bore has a second inlet port connected with a reverse flow groove of the reverse valve and has a second outlet port connected with a reverse directional area of the motor;
- and the regulator means includes an angularly positionable bushing having a surface cavity registrable in a first position of the bushing to communicate the first inlet port with the first outlet port and registrable in a second position of the bushing to communicate the second inlet port with the second outlet port.
Dependencies are inferred from the claim text.