An example bushing of a hydraulic hammer tool includes a bulk region and an inner region. The inner region has a relatively greater hardness than the bulk region. The inner region may also be compressively stressed, while the bulk region may have tensile stress. The stress and/or hardness profile of the bushing may enhance its resistance to wear and galling defects when a hammer of the hydraulic hammer tool is held in alignment by the bushing. The bulk region of the bushing may be relatively soft, resulting in the bushing having a relatively high level of toughness. The bushing may be formed using medium to high carbon steel by rough forming the bushing, hardening the bushing, tempering the bushing, induction hardening the inner region of the bushing, and then quenching the inner region.

An impact hammer for breaking a working surface, the hammer including a drive mechanism and a housing with an inner containment surface and a reciprocating hammer weight. A reciprocation cycle of the hammer weight includes an upstroke and a down-stroke, the hammer weight respectively moving upwards and downwards. On the down-stroke the hammer weight impacts a striker pin with a driven end and a working surface impact end. A vacuum chamber in the housing is formed by the containment surface, upper vacuum sealing coupled to the hammer weight and lower vacuum sealing. The hammer weight is driven toward the striker pin by the pressure differential between atmosphere and the vacuum chamber formed on the upstroke. A down-stroke vent permits fluid egress from the vacuum chamber on the down-stroke.

An example bushing of a hydraulic hammer tool includes an outer region and an inner region. The inner region has a relatively greater hardness than the outer region. The inner region may also be compressively stressed, while the outer region may have tensile stress. The stress and/or hardness profile of the bushing may enhance its resistance to wear and galling defects when a hammer of the hydraulic hammer tool is held in alignment by the bushing. The outer region of the bushing may be relatively soft, resulting in the bushing having a relatively high level of toughness. The bushing may be formed using medium to high carbon steel by rough forming the bushing, hardening the bushing, tempering the bushing, and induction softening the outer region of the bushing.

A bucket can be configured to be used with excavating equipment. The bucket can include a bucket body. The bucket body can have a cutting edge with an actuator disposed adjacent to the cutting edge. A cutting tooth can be provided adjacent an end of the actuator, wherein the cutting tooth can be moveable by the actuator relative to the bucket body. The bucket body can include a void or hollow compartment in which motors, controllers, and other equipment can be housed that are configured to facilitate the selective movement of the cutting tooth.

A rock claw for attaching to a corner of a demolition hammer, the rock claw including a first wall having a first inner side surface, a second wall having a second inner side surface joined to the first inner side surface along a first intersection, and a third wall having a third inner side surface. The third inner side surface is joined to the first inner side surface along a second intersection and the third inner side surface is joined to the second inner side surface along a third intersection.

The present invention relates to a hydraulic breaker comprising: a back head having a gas chamber provided therein; a cylinder disposed at the lower part of the back head, and having a hydraulic passage and a hydraulic space; a front head disposed at the lower part of the cylinder; a chisel provided inside the front head; a piston provided to reciprocate in the cylinder so as to hit the chisel; and a breaker main body having a plurality of penetration bolts integrally connecting the back head, the cylinder, and the front head, wherein the back head of the breaker main body is provided with a control valve for supplying and blocking hydraulic pressure to/from the hydraulic passage and the hydraulic space.

There is provided an excavation assembly for use in an excavator, wherein the excavation assembly is removably coupled to an arm at a pair of spaced shaft-receiving portions defined therein, wherein the excavation assembly performs an excavation operation into a ground or a rock, wherein the excavation assembly comprises: a body removably coupled at one end thereof to the pair of spaced shaft-receiving portions; a driving mechanism configured to generate at least one of a linear driving force, a rotational driving force, and a striking force; an excavation tool coupled to the driving mechanism and configured to be driven by at least one of the linear driving force, the rotational driving force, and the striking force transmitted from the driving mechanism, thereby to perform the excavating operation, wherein a direction of the excavation operation by the excavation tool varies depending on coupling positions between the pair of spaced shaft-receiving portions and the body.

An impact hammer for breaking a working surface, the hammer including a drive mechanism and a housing with an inner containment surface and a reciprocating hammer weight. A reciprocation cycle of the hammer weight includes an upstroke and a down-stroke, the hammer weight respectively moving upwards and downwards. On the down-stroke the hammer weight impacts a striker pin with a driven end and a working surface impact end. A vacuum chamber in the housing is formed by the containment surface, upper vacuum sealing coupled to the hammer weight and lower vacuum sealing. The hammer weight is driven toward the striker pin by the pressure differential between atmosphere and the vacuum chamber formed on the upstroke. A down-stroke vent permits fluid egress from the vacuum chamber on the down-stroke.

An impact hammer for breaking a working surface, the hammer including a drive mechanism and a housing with an inner containment surface and a reciprocating hammer weight. A reciprocation cycle of the hammer weight includes an upstroke and a down-stroke, the hammer weight respectively moving upwards and downwards. On the down-stroke the hammer weight impacts a striker pin with a driven end and a working surface impact end. A vacuum chamber in the housing is formed by the containment surface, upper vacuum sealing coupled to the hammer weight and lower vacuum sealing. The hammer weight is driven toward the striker pin by the pressure differential between atmosphere and the vacuum chamber formed on the upstroke. A down-stroke vent permits fluid egress from the vacuum chamber on the down-stroke.

A hydraulic rock breaking machine and an apparatus and method for monitoring operation of the same is provided. The apparatus includes at least one pneumatic sensor arranged for monitoring an inner space of the machine and at least one control unit configured to receive and process the pneumatic sensing data.