Hydraulic shock absorber

A hydraulic shock absorber comprising:

• telescopically-connected inner and outer cylinders;
• a first one of said cylinders including a piston rod extending coaxially therewith from a closed end wall of said first cylinder and provided with a piston thereon;
• a second one of said cylinders including a closed end wall at one end thereof and a first radial partition wall adjacent the other end of said second cylinder formed with a hole through which said piston rod extends and dividing an enclosed space defined by said inner and outer cylinders;
• said piston being located in said second cylinder;
• said second cylinder further including a second radial partition wall extending between said first partition wall and said piston and formed with a hole through which said piston rod extends;
• said second partition wall being further formed with a plurality of radially-spaced oil path apertures;
• an elastic ring member closely and slidably fitted on said piston rod between said first and second partition members so as to abut against said first partition wall to sealingly close said hole therein during extension stroke movement of said piston rod and to abut against said second partition wall to sealingly close said hole therein during compression stroke movement of said piston rod, such that said elastic ring member, when in abutting engagement with either of said partition walls, can be forced to slide along said piston rod in relation to further movement of said piston rod;
• said piston rod being provided therethrough with an axial oil path providing communication between a chamber defined by said first cylinder between said end wall of said first cylinder and said first partition wall and a chamber defined by said second cylinder between said end wall of said second cylinder and said piston;
• and
• a check valve provided within said axial oil path, said check valve being adapted to open said axial oil path during the extension stroke of said hydraulic shock absorber.