Shock absorber for crutches

A shock absorber for a crutch having

• a lower strut formed of upper and lower telescopically connected pipes, the upper pipe having diametrical holes,
• a pin disposed in a selected one of the diametrical holes of the upper pipe, and
• a spring operatively supported between the lower strut and the pin to provide shock absorbing during telescopic movement of the lower pipe relative to the upper pipe,
• wherein said shock absorber comprises:
• a plug member attachable to a top end of the lower pipe and having an upwardly extending axial guide rod for receiving the spring thereon, said plug having formed therein an axially elongated hole and a non-axially elongated hole;
• and
• a lower pin member selectively engageable in a shock-absorbing position in which said lower pin member is fixed relative to the upper pipe and extends into said axially elongated hole of said plug member to allow play between said plug member and the upper pipe, and in a non-shock-absorbing position in which said lower pin member is fixed relative to the upper pipe and extends into said non-axially elongated hole of said plug member to prevent play between said plug member and the upper pipe.