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US 11,536,106 B2Granted
Predetermined load release device for a jar
AssigneeRobert W. Evans
InventorRobert W. Evans
Life of this patent
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Abstract
A release device for a jarring tool includes a collet positioned between the mandrel of the jarring tool and a trigger sleeve. At least one end of the collet is in contact with a precompressed spring via a bushing. In order for the jarring tool to operate, a force greater than the precompressed force of the spring must be applied to the mandrel so that the collet can move in axial direction against the spring thereby releasing the mandrel.
Claims7
A release device for a jarring mechanism comprising:
- an outer housing,
- a preloaded spring positioned within the outer housing,
- a mandrel positioned within the outer housing,
- an annular collet surrounding an outer surface of the mandrel, axial movement of the collet being resisted by the spring, and
- an annular trigger sleeve surrounding the collet, said annular trigger sleeve positioned between annular round wire wave springs and adapted to move freely in an axial direction by virtue of a gap between the trigger sleeve and a split ring housing surrounding the preloaded spring, the collet including means for releasably engaging the mandrel.
2 more elements
A bidirectional jarring tool comprising:
- a housing,
- a pair of preloaded jarring force springs positioned within the housing,
- a mandrel axially moveable within the housing,
- a single collet positioned between the pair of springs and surrounding the mandrel, and
- a single trigger sleeve surrounding the collet, the trigger sleeve being positioned between annular round wire wave springs and mounted for axial movement in two directions within the housing,
- the mandrel including a hammer surface and the housing including an anvil surface.
3 more elements
Dependencies are inferred from the claim text.