Patent ID: 7770772

Claim:
A cooling system, for a combustion-powered tool, comprising: a cylinder having a longitudinal axis; a piston movably disposed within a piston chamber defined within said cylinder; a combustion chamber, having a longitudinal axis, connected to said cylinder and within which forces and heat are cyclically generated for impacting upon said piston so as to move said piston within said cylinder; a housing externally surrounding external wall portions of said combustion chamber and said cylinder of said combustion-powered tool so as to define an annular cooling air space between internal wall portions of said housing and said external wall portions of said combustion chamber and said cylinder whereby said annular cooling air space externally surrounds said combustion chamber and said cylinder; a cooling air inlet defined upon said housing and fluidically connected to said annular cooling air space externally surrounding said combustion chamber and said cylinder for permitting cooling air to enter said annular cooling air space externally surrounding said combustion chamber and said cylinder; and an air outlet, fluidically connected to both said annular cooling air space externally surrounding said combustion chamber and said cylinder, and said piston chamber, for inducing ambient cooling air to enter said cooling air inlet and to flow into and solely through said annular cooling air space externally surrounding said combustion chamber and said cylinder as air, disposed within said piston chamber and beneath said piston disposed within said piston chamber, is exhausted out from said piston chamber and out through said air outlet as said piston is moved within said piston chamber during a power stroke of said piston of said combustion-powered tool, such that said cooling air, flowing solely within said annular cooling air space, flows past said external wall portions of said combustion chamber and said cylinder and thereby cools said combustion chamber and said cylinder.