Release Lugs for a Jarring Device
AssigneeEvans Engineering & Manufacturing, Inc.
InventorRobert W. Evans
Life of this patent
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Abstract
A release mechanism for a jarring tool is formed by a plurality of segmented release lugs. Each lug includes a plurality of axial spaced projections on an inner surface and a plurality of grooves on an outer surface. The projections have either different widths or are separated by varying distances and releaseably engage corresponding grooves in a mandrel located within a housing of the tool. The release lugs are positioned between a trigger sleeve and the mandrel.
Claims13
A release mechanism for a jarring tool having a mandrel comprising:
- a plurality of arcuate release lugs, each release lug including an inner surface and an outer surface;
- a plurality of axially spaced projections on the inner surface of the release lugs and a plurality of grooves on the outer surface of the release lugs;
- a mandrel having a plurality of axially spaced grooves on an outer surface of the mandrel;
- and
- an annular trigger sleeve surrounding the mandrel, the release lugs being positioned between the annular trigger sleeve and the mandrel, and one or more springs surrounding and in contact with the release lugs.
A jarring tool comprising:
- a housing;
- a mandrel having a plurality of axially spaced grooves;
- a trigger sleeve surrounding the mandrel;
- a plurality of axially extending arcuate release lugs having an inner and outer surface, each lug including a plurality of axially spaced projections on its inner surface and a plurality of grooves on its outer surface;
- said release lugs being positioned between the mandrel and the trigger sleeve;
- and
- a spring means surrounding the mandrel, and one or more springs surrounding and in contact with the release lugs.
A jarring tool as claimed in claim wherein the one or more springs comprise a plurality of springs surrounding the release lugs thereby forming a circular array of release lugs which engages an outer surface of the mandrel.
Dependencies are inferred from the claim text.