A component for a rock breaking system is magnetized into a state of remanent magnetization. The remanent magnetization of the component has a predetermined varying magnetization profile relative to geometry of the component, the varying magnetization profile describing varying magnetization intensity in the component relative to the geometry of the component.

A wellbore assembly can include a completion string having a side pocket. A downhole device can be positioned within the side pocket of the completion string. The downhole device can have a first end sized and shaped for coupling to a tool for inserting and removing the downhole device in the side pocket while the completion string is positioned downhole in a wellbore. The downhole device can be an electronic device.

A rock drill includes a frame, a percussion member, an axial shank, and an axial sleeve provided within the frame and including a first pressure surface provided in a first pressure space and a second pressure surface provided in a second pressure space. A first channel is provided in the axial sleeve for providing a connection between the first pressure space and the second pressure space in at least one position of the axial sleeve in the frame. A second pressure channel connected to the second pressure space is connectable to external pressure. A iu pressure accumulator is connected to the first pressure space and the flow of the pressure medium outwards from the first pressure space is throttled.

A rock drill includes a frame, a percussion member, an axial shank, and an axial sleeve provided within the frame and including a first pressure surface provided in a first pressure space and a second pressure surface provided in a second pressure space. A first channel is provided in the axial sleeve for providing a connection between the first pressure space and the second pressure space in at least one position of the axial sleeve in the frame. A second pressure channel connected to the second pressure space is connectable to external pressure. A iu pressure accumulator is connected to the first pressure space and the flow of the pressure medium outwards from the first pressure space is throttled.

A body of an impact unit, an impact unit and a method of forming a body of an impact unit is disclosed. The body can be an elongated hollow piece including at least two body parts. The body parts are arranged successively in an axial direction of the body and are connected to each other by axial connecting joints. The connecting joints include several slanted fastening screws for connecting the body parts together.

An apparatus (1) with a reciprocating component (3) fitted with composite cushioning slides (13) on an exterior surface (8, 9). The reciprocating component (3) is movable along a reciprocation path and the composite cushioning slide (13) includes an exterior first layer (14) and an interior second layer (15). The first layer (14) is formed with an exterior surface (16) configured and orientated to come into sliding contact with a containment surface (7) of the apparatus (1) during the reciprocating movement of the reciprocating component (3), the first layer (14) is formed from a material of predetermined friction and/or abrasion resistance properties. The interior second layer (15) is located between the first layer (14) and reciprocating component (3) and is formed from a shock-absorbing material having predetermined shock absorbing properties.

An apparatus (1) with a reciprocating component (3) fitted with composite cushioning slides (13) on an exterior surface (8, 9). The reciprocating component (3) is movable along a reciprocation path and the composite cushioning slide (13) includes an exterior first layer (14) and an interior second layer (15). The first layer (14) is formed with an exterior surface (16) configured and orientated to come into sliding contact with a containment surface (7) of the apparatus (1) during the reciprocating movement of the reciprocating component (3), the first layer (14) is formed from a material of predetermined friction and/or abrasion resistance properties. The interior second layer (15) is located between the first layer (14) and reciprocating component (3) and is formed from a shock-absorbing material having predetermined shock absorbing properties.

A manually operated pneumatic rock drill positioner for mining shaft wall boring, said positioner comprising: an articulated boom having one end for releasable coupling to a mobile ground platform and another end opposite said one end thereof; a rigid elongated drill turret defining a main body with an exposed outer wall, an inner wall opposite said outer wall, and first side edge wall and second side edge wall opposite said first side edge wall, and first end and second end opposite said first end, a lengthwise rail member integrally mounted to said turret outer wall; a carriage slidingly engaging said rail member, said carriage for slidingly carrying a pneumatic drill head over said turret exposed outer wall for reciprocating motion thereof between said first end and second end thereof; drive means for power actuating said carriage sliding motion along said rail member; a cradle member releasably anchored to said boom another end and defining a well sized and shaped for releasable engagement by an intermediate section of said turret inner wall and said first side edge wall thereof; anchoring means for anchoring said turret to said cradle member; first coupling means for pivotally connecting said turret to said cradle member for relative pivotal movement of said turret about said cradle member along a first axis; second coupling means for pivotally connecting said turret to said cradle member for relative tilting movement of said turret about said cradle member along a second axis transverse to said first axis; all in such a way that the intersection of said first axis and second axis coincides with the center of gravity of said turret positioner and is located within said turret main body, providing a balanced load-free manual operation of the positioner.

A manually operated pneumatic rock drill positioner for mining shaft wall boring, said positioner comprising: an articulated boom having one end for releasable coupling to a mobile ground platform and another end opposite said one end thereof; a rigid elongated drill turret defining a main body with an exposed outer wall, an inner wall opposite said outer wall, and first side edge wall and second side edge wall opposite said first side edge wall, and first end and second end opposite said first end, a lengthwise rail member integrally mounted to said turret outer wall; a carriage slidingly engaging said rail member, said carriage for slidingly carrying a pneumatic drill head over said turret exposed outer wall for reciprocating motion thereof between said first end and second end thereof; drive means for power actuating said carriage sliding motion along said rail member; a cradle member releasably anchored to said boom another end and defining a well sized and shaped for releasable engagement by an intermediate section of said turret inner wall and said first side edge wall thereof; anchoring means for anchoring said turret to said cradle member; first coupling means for pivotally connecting said turret to said cradle member for relative pivotal movement of said turret about said cradle member along a first axis; second coupling means for pivotally connecting said turret to said cradle member for relative tilting movement of said turret about said cradle member along a second axis transverse to said first axis; all in such a way that the intersection of said first axis and second axis coincides with the center of gravity of said turret positioner and is located within said turret main body, providing a balanced load-free manual operation of the positioner.

The invention concerns a hydraulic striking tool for application in rock and/or concrete cutting equipment containing a machine housing (100;200) with a cylinder (115;215) with a moveably mounted piston (145;245) which during operation performs a repetitive forward and backward movement relative to the machine housing (100;200) and directly or indirectly strike a rock and/or concrete cutting tool (155;255), and where the piston (145;245) includes a driving part (165;265) which separates a first (120;220) and a second (105;221) driving chamber formed between the piston (145;245) and the machine housing (100;200) and where these driving chambers are arranged to include a pressurized working fluid during operation. The total volume V of the first and second driving chambers is inversely proportional dimensioned to the square of a for the striking tool recommended maximal pressure p, as well as proportional, by a proportionality constant k within the interval 5.3-21.0, to the product of the pistons energy E during the strike against the tool and compression module β of the working fluid.