Joseph L Carter

US Patent:

39600351, Jun 1, 1976

Filed:

Nov 1, 1974

Appl. No.:

5/519975

Inventors:

William Workman - Spring Lake MI
Joseph F. Carter - Spring Lake MI

Assignee:

Gardner-Denver Company - Dallas TX

International Classification:

F16D 2500
F16D 1322
F16D 4320
F16H 5710

US Classification:

74785

Abstract:

A speed shifting mechanism for a pneumatic wrench or nutsetter comprises a planetary gear arrangement in the drive mechanism of the wrench in which the planet gear carrier is connected to the driver clutch member of a torque responsive clutch and the planetary ring gear is mounted in a one way clutch to provide for unidirectional rotation of the ring gear. The torque responsive clutch is of the sloping tooth type and the driving clutch member is connected to a piston having opposing faces and fitted in the tool housing to form opposed fluid chambers. Pressure fluid is admitted to one of the chambers at a controlled pressure to act on the piston for holding the clutch in the engaged condition. Movement of the driving clutch member at torque causes pressure fluid at the controlled pressure to be vented and the opposite chamber to become pressurized thereby acting on the clutch to disengage and enable the planetary gear arrangement to become operative to reduce the output speed of the wrench.