Implements or apparatus for applying pushing or pulling force – Pipe or rod jack – Tie rod tensioner
Patent
1990-06-14
1991-09-17
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Pipe or rod jack
Tie rod tensioner
E21B 1900
Patent
active
050487930
ABSTRACT:
An apparatus is provided for handling a pipe to be used in a pipeline replacement operation or the like. The apparatus includes upper and lower semicircular pipe-gripping sections slidably received on a base and drive pistons connected to the lower pipe-gripping section for moving the pipe-gripping sections from a pipe-releasing position to a pipe-gripping position and then to extended positions in which the gripped pipe has been moved axially with respect to the base. The apparatus also includes a collar affixed to the base for receiving a pipe from the pipe-gripping sections. The collar includes offset cams movable between a first position allowing axial movement of the pipe in an axially forward direction and an axially rearward direction and a second position allowing movement only in the axially forward direction.
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Cotherman Jesse W.
Mefford John B.
Scott Bob G.
Miller Pipeline Corporation
Watson Robert C.
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