Patent ID: 7568602

Claim:
A suspension system for a fan motor of a combustion chamber in a combustion-powered tool for driving a fastener into a workpiece, the fan motor disposed within a cylinder head, the tool generating an acceleration of the fan motor in an axial direction away from the workpiece upon a combustion in the chamber and a subsequent reciprocal axial acceleration of the fan motor, at least one of the accelerations causing the fan motor to oscillate relative to the tool, the system comprising: an elastic member disposed within the tool and in direct contact with the motor, said elastic member being disposed relative to the motor to directly receive and absorb force along the axial direction to counteract and dampen the acceleration; and a restraining member disposed within the tool, said restraining member being mounted to the cylinder head of the tool within a cavity defined in said cylinder head for accommodating the fan motor and disposed in a groove defined by the cylinder head relative to said elastic member to secure said elastic member relative to the cylinder head, thereby resisting upward bias of said elastic member in response to the acceleration of the fan motor; wherein the motor is restrained against upward movement by engagement via said elastic member, which in turn is restrained by said restraining member.