Patent ID: 7328753

Claim:
A hydraulic breaking hammer, comprising: a housing with a longitudinal bore; a hammer piston reciprocally guided in the bore; a working implement receiving guide sleeve, for receiving a working implement, provided in a front part of the bore; a retaining mechanism arranged to axially lock, with respect to an axial direction of the longitudinal bore of the housing, the working implement and the guide sleeve; and a lubricant supply passage, provided in the housing, communicating with an inside of the guide sleeve via at least one radial opening in the guide sleeve; wherein an outside of the guide sleeve is provided with at least two circumferentially extending seal rings which are axially spaced apart from each other along the axial direction of the longitudinal bore to form between them at least one annular compartment having an axial extent along the axial direction that is determined by a distance between the seal rings along the axial direction; and wherein said at least one annular compartment is arranged to communicate both with the lubricant supply passage and with said at least one radial opening in the guide sleeve, such that a lubricant is supplied from the lubricant supply passage to the inside of the guide sleeve via said at least one annular compartment and said at least one radial opening, whereby the lubricant is spread over a part of an outside surface of the guide sleeve defined by the axial extent of said at least one annular compartment.