Patent ID: 6135214
Filing Date: 2000-10-24
Classification: E02D

Abstract:
In a fluid power operated hammer that includes a fluid-operated cylinder, a piston rod attached thereto, and an impact ram which is driven by said cylinder and said piston rod for impacting a desired object, the improvement comprising a non-mechanical connection between said piston rod and said impact ram which includes:(a) a body portion attached to one end of said piston rod and having an exterior surface portion formed with a first generally annular-shaped groove therein;(b) a cavity formed in said impact ram for receiving therein said body portion, said cavity including a wall portion disposed adjacent said exterior surface of said body portion at a predetermined spacing therefrom and being formed with a second generally annular-shaped groove therein disposed in facing relation to said first groove in said body portion; and(c) a ring formed of resilient material and captured within both said first and second facing grooves for transmitting forces between said piston rod and said impact ram, said ring being the sole connection between said piston rod and said impact ram for transmitting at least the major driving force between said piston rod and said impact ram, and said ring having an axial thickness which is greater than said predetermined spacing between said cavity wall portion and said exterior surface of said body portion.