Patent ID: 7618082

Claim:
A vehicle shock absorber having first and second ends, said shock absorber comprising: opposing first and second walls; said first wall disposed apart from said second wall; a shock receiving surface at said first end connecting said first and second walls; a plurality of recessed grooves spaced substantially equally disposed in said first and second walls, and substantially perpendicular to said shock receiving surface; and said recessed grooves extending from said shock receiving surface to said second end, such that a plurality of notches are formed in the shock receiving surface wherein a parting line disposed between notches formed by recessed grooves disposed in said first wall and notches formed by recessed grooves disposed in said second wall, and the recessed groove in the second wall is provided at a position opposed to a wall surface between two adjacent recessed grooves formed in the first wall so that the recessed grooves formed in the first wall and recessed grooves formed in the second wall are disposed alternately, and a distance (a) from a lower end of a recessed groove in a first wall to a second wall is made equal to a distance (b) from the lower end of the recessed groove in the first wall to a lower end of the recessed groove in the second wall; said vehicle shock absorber being hollow and blow molded of thermoplastic.