Abstract: A hydraulic shock absorbing device fastened inside either blade of a bicycle front fork to absorb shocks, the device including a damping liquid chamber and a damping liquid cell respectively molded from rubber or elastic material and connected together through a partition plate having liquid passages for the passing of a damping liquid between the damping liquid chamber and the damping liquid cell to let shocks transmitted from the bicycle front fork be absorbed. Shock absorbing rubber blocks or springs may be mounted on two opposite ends of the hydraulic shock absorbing device when it is installed in the bicycle front fork.

Abstract: A process for preparing polyurethane integral skin foam with low ozone depletion potential, which comprises mixing 100 pph of a polyether polyol, 5-50 pph of a chain extender, 0.1-2.0 pph of a surfactant, 0.01-0.20 pph of an amine and 0.01-0.20 pph of an organotin catalyst, 0-3.0 pph of a nucleating agent and 1.0-30 pph of a blowing agent comprising 50 to 100 weight percent of HCFC-123 and 50 to 0 weight percent of HCFC-141b to form a polyol mixture; blending said polyol mixture with isocyanate having an ISO index=0.95 to 1.10 and reacting said blend at a temperature from 0.degree.-70.degree. C. in a mold at a temperature of from 10.degree. to 90.degree. C. for a molding time of 1 to 9 minutes to form a polyurethane integral skin foam, and the product of said process.