Abstract: A twin tube shock absorber has concentric inner and outer tubes connected to the wheel of a vehicle. A piston in the inner tube is connected to the chassis of the vehicle and divides the interior of the inner tube into upper and lower chambers. Fluid passes between these chambers and an annular reservoir between the tubes for absorbing shock in a conventional manner. An orifice is provided through the sidewall of the lower portion of the inner tube and is surrounded by a lower sleeve, which normally keeps the orifice closed. Upon upward acceleration of the tubes, the sleeve essentially remains fixed in space. The relative movement between the sleeve and tubes aligns a passage through the sleeve with the orifice and permits fluid to flow from the lower chamber below the piston to the annular reservoir. This provides a softer shock absorber when high upward acceleration is felt by the tubes of the shock absorber and a stiffer shock absorber during times when there is no large upward acceleration.

Abstract: A shock absorber which is inertia responsive in both compression and extension strokes to provide rapid flow in either direction responsive to rapid large changes in loading as caused by a bump or dip. The inertia responsive valving is located in the piston or the piston rod or both affording simple shock absorber body design and simple cooling. The inertia responsive valving members are longitudinally slidable and of substantially uniform cross section so as to be substantially immune to acceleration forces due to turns and are substantially insensitive to pressure changes.

Abstract: An oil change kit including an oil impervious box dimensioned to hold a container or containers constituting the quantity of oil for a single engine oil change, e.g. 5 quarts. The box includes a top closure which is contiguous with the side and end walls and is foldable into three different conditions, 1) to display part of the oil container or containers, 2) to define a funnel-like opening for receiving waste oil and 3) foldable to seal the box with waste oil ready for disposal. Accessories contained in the kit and stored in the volume not taken up by the new motor oil containers is a wipeup cloth, a pair of disposable gloves and a universal wrench.

Abstract: Disclosed are suspension devices for motorcycles, in which the rear wheel is rotatively supported by rear ends of right and left side swing arms front ends of which are pivotally connected to rear low-portion of the vehicle frame, one end of a link lever pivotally supported at its center portion by rear upper-portion of the frame is pivotally connected to the swing arms via a rod member at each side of the rear wheel and other end of said link lever is pivotally connected to upper end of a spring member, and lower end of said spring member is pivotally connected to a position of each swing arm.