The present invention provides a boom system 1 for breaking and manoeuvring oversize material. The boom system 1 is mounted or attached to a vehicle. The boom system 1 comprises a base 2, a column 5 protruding upwardly from the base 2 and a boom arm 3 moveably connectable to the upright column 5 at connection point 16. A moving arrangement 4 is provided to move all or part of the upright column 5 towards and away from the base 2 so that the connection 16 between the boom arm 3 and the upright column is moveable towards and away from the base 2. A mobile crusher comprising a boom system 1 for breaking and manoeuvring oversize material is also provided.

A carrier comprising at least one hydraulic cylinder having a piston, a controller and a piston position sensor, wherein the carrier is arranged to carry a tool through the use of the hydraulic cylinder and wherein the controller is configured to: receive control input for moving the tool; receive piston position information for at least one piston of the at least one cylinders; determine a current angle for the tool based on the piston position information; and determine that the current angle approximates a desired angle, and in response thereto halt the tool at the desired angle. According to an aspect the controller may be configured to detect and determine the position of a subject relative the carrier based on hydraulic pressure information and tool operational information. Further, the application concerns methods applied with the embodiments of said carrier.

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.

A hydraulic striking device that is mounted on construction equipment such as an excavator and breaks solid rocks in the grounds using a rod that is hit by a piston is proposed. Particularly, a hydraulic striking device that can automatically switch stroke modes by sensing the intensity of pressure of an upper chamber formed at an upper portion between a piston and a cylinder in accordance with the statuses of rocks in the ground is proposed.

A lubrication system for a hydraulic hammer includes a body defining a recess in fluid communication with a lubricant inlet and a lubricant outlet. A sleeve, located co-axially within the recess, defines a stepped tubular cavity having first and second portions. The sleeve also defines inlet and outlet ports extending from an outer surface to an inner surface of the sleeve. A piston, located partly within the recess and the first portion of the stepped tubular cavity respectively, has a tubular cavity co-axial with the stepped tubular cavity. A spool is located partly within the tubular cavity and the second portion of the stepped tubular cavity respectively. The spool co-operates with the inlet and outlet ports of the sleeve for reciprocally moving the piston in relation to the body so that lubricant from the lubricant inlet is delivered by the piston to the lubricant outlet via the recess.

A tool for a machine implement is disclosed. The tool may include a hardened portion of a material and a softened portion of the material. The hardened portion may extend along and encompass a longitudinal axis of the tool between a base end and a tip end of the tool. The softened portion may extend along and be offset from the longitudinal axis of the tool between the base end and the tip end of the tool.

Disclosed are a vehicle body utilized in a rockbreaker, a rockbreaker, and a rock breaking method. A rock breaking operation area is configured to pass through the vehicle body and in a direction perpendicular to and above the ground. An operation area of a rockbreaker arm is arranged within a vehicle range.

A hydraulic hammer includes a housing defining a cutout and a power cell slidably received within the housing. The power cell includes a valve assembly extending from a side of the power cell. The valve assembly is at least partially received within the cutout of the housing. The hydraulic hammer further includes a pair of wear plates at least partially disposed around the valve assembly of the power cell. Each of the pair of wear plates is coupled to at least one of the power cell and the housing.

An impact hammer (1) for breaking a working surface (5), the hammer including a drive mechanism (11, 12, 14) and a housing (6) with an inner containment surface (8) and a reciprocating hammer weight (9). A reciprocation cycle of the hammer weight (9) includes an upstroke and a down-stroke, the hammer weight (9) respectively moving upwards and downwards. On the down-stroke the hammer weight (9) impacts a striker pin (4) with a driven end (17) and a working surface impact end (18). A vacuum chamber (22) in the housing is formed by the containment surface (8), upper vacuum sealing (24) coupled to the hammer weight (9) and lower vacuum sealing (25). The hammer weight (9) is driven toward the striker pin (4) by the pressure differential between atmosphere and the vacuum chamber (22) formed on the upstroke. A down-stroke vent (43) permits fluid egress from the vacuum chamber (22) on the down-stroke.

A maintenance assistance device includes an attachment use time acquisition unit and a maintenance estimate time calculation unit. The attachment use time acquisition unit acquires a time during which an attachment is used. The attachment is mounted on a work machine and is different from a bucket. The maintenance estimate time calculation unit calculates a maintenance estimate time of a consumable equipped with the work machine based on the time during which the attachment is used.