Locking device to load and to screw a drill stem and casing tube

Details Locking device to load and to screw a drill stem and casing tube Locking device to load and to screw a drill stem and casing tube

1998-04-21

2000-08-15

Shackelford, H.

Wells

Above ground apparatus

With means facilitating connecting or disconnecting...

166 7752, 175203, E21B 1916

Patent

active

061021164

ABSTRACT:
A locking device has a lower concave housing suitable to receive and hold an upper end of an element to be attached to a drill stem. The housing forms a conical surface. A number of blocks slides along the conical surface. Each block has an outside sliding surface that is parallel to the conical surface and has an inside surface suitable to engage the elements to be held. The blocks are mounted to slide along the conical surface. The blocks are moveable from a first, free position in which the blocks are pushed toward the lower, outside surface of the conical surface to a second, locked position in which the blocks are radially clamped against the element to be hold.

REFERENCES:
patent: 3748702 (1973-07-01), Brown
patent: 5645131 (1997-07-01), Trevisani

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