Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1998-01-05
1999-12-07
Bagnell, David
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
1662427, 464163, E21B 1918, E21B 1504
Patent
active
059967129
ABSTRACT:
A mechanical swivel apparatus which has a first upper body portion threadably attached to the lower end of a side entry sub apparatus, and a second lower portion which is threadably attached to a section of drill pipe, the apparatus positionable above the rotary table on the rig floor, and having a continuous bore therethrough for running wireline or the like. The upper body portion includes a counterbore for receiving the upper end of a mandrel, so that the mandrel is able to move within the counterbore of the upper body portion. The lower portion comprises an open-ended cap member which threadable engages the upper body portion, and has a shoulder portion which engages a flange around the body of the mandrel so that the mandrel is allowed to move within the upper body portion but cannot be slidably removed therefrom. On its upper end, the mandrel portion further includes a plurality of outwardly extending teeth which define spaces therebetween, so that a pair of pin members extending into the counterbore in the upper body portion, at a first position, engage the teeth so that the mandrel portion is locked in place with the body portion. In a second position, the teeth on the mandrel are moved out of position from the pins, allowing the mandrel, and the drill string below the mandrel to move freely. In operation, the pins are engaged within the inner spaces between the teeth so that when the upper body portion is rotated, the mandrel is rotated and in a second position when the body portion moves to a down position, the pins are disengaged from the teeth so that the lower mandrel portion can remain stationary while the upper body portion is rotated.
REFERENCES:
patent: Re33150 (1990-01-01), Boyd
patent: 2016042 (1935-10-01), Lewis
patent: 2100418 (1937-11-01), Welikanov
patent: 4064953 (1977-12-01), Collins
patent: 4506729 (1985-03-01), Davis
patent: 4572305 (1986-02-01), Swietlik
patent: 5314032 (1994-05-01), Pringle et al.
patent: 5495901 (1996-03-01), Livingstone et al.
Bagnell David
Cho Chong S.
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