Latching device
This patent describes a latching device for selectively locking and retrieving a vertically oriented well tool from a vertically oriented tubular receiver having an inwardly projecting locking shoulder with upper and lower angularly bevelled surfaces, the latching device. It comprises: a means for attaching the latching device to an upper portion of the well too; a substantially cylindrical body provided with means to facilitate installation of the latching device within the tubular receiver; a locking sleeve means mounted in axially slidable, surrounding relationship on the cylindrical body, the locking sleeve having an upper shoulder to facilitate retrieval of the latching device from the tubular receiver, an intermediate shoulder, a lower shoulder, a reduced diameter cylindrical body portion extending between the intermediate shoulder and the lower shoulder and further having an enlarged diameter lower portion; an annular locking ring mounted on the locking sleeve means for effectively locking the latching device in the tubular receiver; a spring means compressively arranged to urge the locking ring downwardly relative to the well tool, the spring means being compressed by the locking ring when the locking ring passes the locking shoulder of the tubular receiver and being released after passing of the locking shoulder by the locking ring.
- Assignee:
- NOV; NOV-90-029092; EDB-90-152722
- Patent Number(s):
- US 4940089; A
- Application Number:
- PPN: US s 7-279995
- OSTI ID:
- 6831024
- Resource Relation:
- Patent File Date: 5 Dec 1988
- Country of Publication:
- United States
- Language:
- English
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