Patent ID: 6782956
Filing Date: 2004-08-31
Classification: B25B

Abstract:
A drive system comprising:a frame defining an axis and enclosing an interior space, the interior space housing lubricant; and a piston supported by the frame and being moveable axially in the interior space and rotatable about the axis, the piston dividing the interior space and defining a first chamber, a second chamber, and a plurality of channels communicating between the first chamber and the second chamber, the piston supporting an inertial valve, the inertial valve being moveable between a first orientation, in which at least a portion of the inertial valve is spaced apart from at least one of the plurality of channels to permit lubricant flow along the at least one of the plurality of channels, and a second orientation, in which the inertial valve sealingly engages the at least one of the plurality of channels, the inertial valve being moveable between the first orientation and the second orientation in response to movement of the piston along the axis.