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AssigneeAtlas Copco Construction Tools AB
InventorsStig Henriksson, Anders Lundgren
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A hydraulic breaker hammer comprises a housing (10) with a longitudinal bore (12), a cylinder sleeve (14), and a cylinder sleeve (14) engaging rear end cover (16), a hammer piston (15) reciprocally powered in the cylinder sleeve (14) for delivering blows to a working implement inserted in a guide sleeve (20) at the front end of the bore (12), wherein the guide sleeve (20) is provided with radial openings (22a,b) for communication of lubricant from a lubricant supply passage (21) in the housing (10) to the inside of the guide sleeve (20), and the guide sleeve (20) is provided with external seal rings (23 a-d) forming annular compartments located between the lubricant supply passage (21) and the radial openings (22 a,b) for spreading lubricant on the outside surface of the guide sleeve (20), a distribution valve (31) communicating with the pressure fluid source and the cylinder sleeve (14) and comprising both a clearance seal means (44) and a seat seal (45,46) for improved tightness, and a pressure accumulator (50) with an expansion chamber (52) divided by a flexible membrane (53), wherein a movable membrane support (59) is limited in its outward displacement by a bulge shaped projection (66) formed integrally with one of the expansion chamber walls (58).
Hydraulic breaking hammer, comprising a housing (10) with a longitudinal bore (12), a hammer piston (15) reciprocally powered in the bore (12), a working implement receiving non-rotating guide sleeve (20) is received in the forward end of the bore (12), a working implement retaining means (26a, b) arranged to axially lock the guide sleeve (20) as well, and a lubricant supply passage (21) in the housing (10) communicating with the inside of said guide sleeve (20) via one or more radial openings (22 a,b) in said guide sleeve (21), charecterized in that said guide sleeve (21) is provided on its outside with at least two circumferentially extending annular seal elements (23 a-d) which are axially spaced apart and which together with each other and with the bore (12) form at least one annular compartment (24,25), said one or more radial openings (22 a,b) are located in said at least one annular compartment (24,25), such that lubricant is supplied to the inside of said guide sleeve (20) via said at least one annular compartment (24,25) and said one or more radial openings (22 a,b), thereby supplying lubricant to the outside surface of said guide sleeve (20) within said at least one annular compartment (24, 25).
Dependencies are inferred from the claim text.