Abstract: A demolition hammer is provided that includes a housing that is reversible and a plurality of interchangeable wear plates. The demolition hammer may include a housing a housing having a first wall and a second wall opposite the first wall, and a power cell disposed within the housing, the power cell having a front face, wherein the housing is reversible such that the housing can be used with the power cell in a first orientation in which the front face faces the first wall and a second orientation in which the front face faces the second wall.

Abstract: A gas spring is disclosed for use with a hammer. The gas spring may have a body with a central axis, and a bore aligned with the central axis and extending to at least one open axial end of the body. The gas spring may also have a plurality of gas chambers fully enclosed by the body and isolated from each other. The bore may have a flexible annular wall in communication with the plurality of gas chambers.

Abstract: A plug for closing an aperture defined in a machine component includes a flange, a first portion, and a second portion. The first portion includes a first set of threads configured at a first pitch to engage with threads on the machine component, and a second set of threads configured at a second pitch to lock with the threads on the machine component and retain the first portion within the aperture. The second portion includes a neck portion, and a bolt head extending from the neck portion. The neck region is configured to withstand a pre-determined maximum torque load. The bolt head is operable to threadably engage the first set of threads and the second set of threads with the threads of the machine component and allow shearing of the neck portion if a torque applied on the bolt head exceeds the pre-determined maximum torque load.

Abstract: A hydraulic hammer (14) may include a housing (30) having a distal end defining an opening (38), a bushing (54) positioned adjacent the housing distal end, the bushing (54) having an inner guide surface (58) and a distal end (56), and a tool (22) having a proximal section (60) slidably disposed in the bushing inner guide surface (58) and a distal section (62) projecting from the housing (30) through the opening (38). The hydraulic hammer (14) may further include a composite seal (70) having an exterior cover (72) with a proximal end (76) releasably coupled to the bushing (54) and a distal end (77) projecting from the distal end (56) of the bushing (54), the exterior cover distal end (77) defining a recess (90) opening toward the tool (22), and an interior seal (74) having a base (92) disposed in the exterior cover recess (90) and a sealing arm (94) projecting inwardly from the base (92), the sealing arm (94) being configured to sealingly engage the tool (22).

Abstract: A tool assembly such as a hammer assembly, includes a housing defining a chamber and a reciprocating piston arranged in the chamber for cyclical movement in a work stroke and a return stroke. The housing includes a lower housing member, an upper housing member and an engaging structure which permits the engagement of the upper housing member with the lower housing member by relative rotation of the upper and lower housing members, such that each of the lower and upper housing members defines a portion of the chamber. The upper housing member is a precision component which contains the hydraulic components or other drive components necessary to drive the piston, while the lower housing member can be manufactured separately since it does not need to be manufactured to the high tolerances required by the upper housing member. The resulting tool assembly may be more compact than a conventional tie rod tool assembly.

Abstract: A hydraulic hammer (14) may include a housing (30) having a distal end defining an opening (38), a bushing (54) positioned adjacent the housing distal end, the bushing (54) having an inner guide surface (58) and a distal end (56), and a tool (22) having a proximal section (60) slidably disposed in the bushing inner guide surface (58) and a distal section (62) projecting from the housing (30) through the opening (38). The hydraulic hammer (14) may further include a composite seal (70) having an exterior cover (72) with a proximal end (76) releasably coupled to the bushing (54) and a distal end (77) projecting from the distal end (56) of the bushing (54), the exterior cover distal end (77) defining a recess (90) opening toward the tool (22), and an interior seal (74) having a base (92) disposed in the exterior cover recess (90) and a sealing arm (94) projecting inwardly from the base (92), the sealing arm (94) being configured to sealingly engage the tool (22).

Abstract: A tool assembly (10), for example a hydraulic or pneumatic hammer assembly, comprises a housing (11) defining a chamber (16), a reciprocating work tool (20) arranged in the chamber for cyclical movement in a work stroke and a return stroke, and a tool retention member (80) arranged to restrain the work tool at the end of the work stroke. The tool assembly (10) includes a shock absorber arranged to absorb impact from the work tool at the end of a stroke. The shock absorber comprises an annular resilient flange (102, 154), which may be cantilevered from the tool retention member (80) to absorb impact at the end of the work stroke or may be provided on a bushing (150) arranged to absorb impact at the end of the return stroke. The shock absorbing flange reduces the transmission of shocks into the tool assembly, thereby providing increased life for tool assembly components.

Abstract: A lubrication system for a hydraulic or pneumatic tool is described. The lubrication system includes a valve, a lubricant pumping mechanism and a lubricant storage chamber, the valve being adapted to move between a tool-deactivated position and a tool-activated position to cause the lubricant pumping mechanism to displace lubricant from the lubricant storage chamber. A method of distributing lubricant to a hydraulic or pneumatic tool is also described.

Abstract: A tool assembly provided with a housing defining a chamber, and a reciprocating work tool arranged in the chamber, is disclosed. A tool retention member has an aperture through which the work tool extends. Engaging structure including mutually engaging protrusions on the housing and the tool retention member is configured to permit engagement of the tool retention member with the housing by relative rotation of the tool retention member and the housing. Retention structure on the work tool is configured to prevent removal of the work tool from the housing when the tool retention member is engaged with the housing. A locking structure is configured to lock the tool retention member and housing against relative rotation. A prestressing structure is located between the protrusions on the housing and a portion of the tool retention member and is configured to urge the tool retention member away from the housing.

Abstract: A tool assembly such as a hammer assembly, includes a housing defining a chamber and a reciprocating piston arranged in the chamber for cyclical movement in a work stroke and a return stroke. The housing includes a lower housing member, an upper housing member and an engaging structure which permits the engagement of the upper housing member with the lower housing member by relative rotation of the upper and lower housing members, such that each of the lower and upper housing members defines a portion of the chamber. The upper housing member is a precision component which contains the hydraulic components or other drive components necessary to drive the piston, while the lower housing member can be manufactured separately since it does not need to be manufactured to the high tolerances required by the upper housing member. The resulting tool assembly may be more compact than a conventional tie rod tool assembly.

Abstract: A tool assembly provided with a housing defining a chamber, and a reciprocating work tool arranged in the chamber, is disclosed. A tool retention member has an aperture through which the work tool extends. Engaging structure including mutually engaging protrusions on the housing and the tool retention member is configured to permit engagement of the tool retention member with the housing by relative rotation of the tool retention member and the housing. Retention structure on the work tool is configured to prevent removal of the work tool from the housing when the tool retention member is engaged with the housing. A locking structure is configured to lock the tool retention member and housing against relative rotation. A prestressing structure is located between the protrusions on the housing and a portion of the tool retention member and is configured to urge the tool retention member away from the housing.

Abstract: A tool assembly (10), for example a hydraulic or pneumatic hammer assembly, includes a housing (11) defining a chamber (16), a removable reciprocating work tool (20) arranged in the chamber, and a tool retention member (80) having an aperture through which the work tool extends. The housing (11) includes an engaging structure (50) which permits the engagement of the tool retention member (80) with the housing by relative rotation of the tool retention member and housing. The work tool (20) is provided with retention structure (44) such as a retaining flange which prevents the removal of the work tool from the housing when the tool retention member is engaged with the housing. At least some of the disclosed embodiments may eliminate the need for a retainer pin, thereby allowing the work tool to rotate, possibly avoiding wear, increasing tool life and simplifying tool replacement.