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US 11,655,711 B2Granted
Roof support including extendable links
AssigneeJoy Global Underground Mining LLC
InventorsKeith Dodgson, Mark Brocklehurst
Life of this patent
Estimating the term…
Abstract
A roof support includes a base, a canopy for engaging a mine surface, a shield coupled to the canopy, and a link coupled between the base and the shield. The canopy is supported relative to the base and includes an end configured to be spaced apart from a mine face by a distance. The link is movable between a first position and a second position, and movement of the link between the first position and the second position causing the distance to change.
Claims20
A roof support comprising:
- a base;
- a canopy for engaging a mine surface, the canopy supported relative to the base and including an end configured to be spaced apart from a mine face by a distance;
- a shield coupled to the canopy;
- a jack including a first end coupled to the base and a second end coupled to the canopy, the jack being extendable and retractable to adjust a height of the canopy relative to the base;
- a first link coupled between the base and the shield, the first link movable between a first position in which the first link has a first length and a second position in which the first link has a second length, movement of the first link between the first position and the second position causing the distance to change while substantially maintaining the height of the canopy relative to the base;
- and
- a second link including one end pivotably coupled to the base and another end pivotably coupled to the shield, the first link positioned between the second link and the end of the canopy.
4 more elements
A roof support comprising:
- a base;
- a canopy for engaging a mine surface, the canopy supported relative to the base and including an end positioned proximate a mine face;
- a shield coupled between the base and the canopy;
- and
- a telescoping box link coupled between the base and the shield, the box link including a first portion proximate a first end, a second portion slidably coupled to the first portion, and a linear actuator coupled between the first portion and the second portion, the linear actuator operable to extend and retract the second portion relative to the first portion, the box link having a rectangular cross-sectional profile with the linear actuator positioned within outer walls of the box link, the link movable between an extended position and a retracted position, the end of the canopy being spaced apart from the mine face by a first distance while the link is in the extended position, the end of the canopy being spaced apart from the mine face by a second distance while the link is in the retracted position, wherein the second distance is different than the first distance.
2 more elements
A roof support comprising:
- a base;
- a canopy for engaging a mine surface, the canopy supported relative to the base and including an end positioned proximate a mine face, the canopy being spaced from the base by a height;
- a shield coupled between the base and the canopy;
- and
- a telescoping link including a first portion, a second portion, and a linear actuator coupled between the first portion and the second portion, one of the first portion and the second portion coupled to the base, the other of the first portion and the second portion coupled to the shield, the linear actuator operable to extend and retract the second portion relative to the first portion, the telescoping link movable between an extended position and a retracted position, movement of the telescoping link between the retracted position and the extended position causing the canopy to translate in a direction perpendicular to the mine face while maintaining the height of the canopy relative to the base.
2 more elements
Dependencies are inferred from the claim text.