Title: Hydraulic hammer assembly

Abstract: A hydraulic hammer assembly is disclosed which comprises a stationary piston suspended within a tubular frame or casing and a cylinder locked inside a massive ram within the casing. The cylinder forms a differential hydraulic assembly with the piston and moves up and down along the piston. The cylinder is maintained locked to the ram by the pressure of the hydraulic fluid; and the piston, which is formed of two members, is held in assembly by a continuous hydraulic bias with a special hydraulic balancing arrangement which compensates for the pressure switching in the cylinder to which one portion of the piston assembly is exposed.

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Inventors: Swenson, William J. (Houston, TX, US)

Application Number: 523527
Filing Date: 1974-11-13
Publication_date: 1976-02-24
Assignee: Raymond International, Inc. (Houston, TX)
Primary Class(es): 173/125 91/216B, 92/117A, 173/126
Other Classes:
US Patent Ref:

1077469	Nov, 1913	Goubert	91/216.
2068045	Jan, 1937	Wohlmeyer	173/125.
3216327	Nov, 1965	Johannsson	91/216.
3431986	Mar, 1969	Jansz	173/134.
3511130	May, 1970	Fishburne	91/216.

Other Refs:
Primary Examiner: Purser, Ernest R.
Assistant Examiner:
Attorney: Fitzpatrick, Cella, Harper & Scinto