Edelbrock Corporation

Frank W Alioto

Donald G Richardson

David A Shirley

A twin tube shock absorber having inner and outer tube with an annular reservoir between the tubes. A piston in the inner tube divides the inner tube into an upper chamber and a lower chamber and valves through the piston control stiffness of the shock absorber. An acceleration sensitive valve assembly mounted in the base valve makes the shock absorber &ldquo;soft&rdquo; upon downward acceleration of the wheel of the vehicle in which the shock absorber is mounted. The valve assembly includes a port for fluid communication between the lower chamber and a conduit, and an inertial mass blocking the port in a port-closed position and not blocking the port in a port-open position. The inertial mass is normally in a lower port-closed position in absence of downward acceleration of the tubes of the shock absorber. Upon downward acceleration of the tubes, the inertial mass moves upwardly toward a port-open position where fluid flow through the port is not blocked.

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Los Angeles, CA, United States of America

Frank W Alioto