Patent ID: 7681559

Claim:
A torsion damping mechanism for a rotary blower that is adapted to be rotatably interposed between a first drive member for driving a first gear in constant mesh with a second gear and a second drive member rotatably driven in one direction by torque from a periodic combustion engine; the torsion damping mechanism comprising: a generally annular body having a central opening and disposed for rotation about an axis and fixed to one of the drive members, the body including a plurality of circumferentially spaced apart bores and a plurality of circumferentially spaced apart generally arcuate-shaped slots; a cushion damper including a plurality of cushioning members each adapted to be received in a corresponding slot in the body, the cushion damper having a webbing that extends over a portion of the central opening; axially extending first pins each having one end loosely received by one of the slots and another end fixed to the first drive member; axially extending second pins each having one end fixedly received by the bores and another other end fixed to the second drive member; and a spring fixed at one end to the body end having a free end extending radially in cantilever fashion into at least one of the slots, the spring interposed between the cushioning member of the one slot and the pin therein.