Downhole tool
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United States of America Patent
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-
Apr 6, 1999
Grant Date -
N/A
app pub date -
Jul 5, 1996
filing date -
Jul 5, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A downhole tool comprises a tubular body (12) for location in a tubular member, such as a drill string, and defines a through bore (20) and a number of circumferentially spaced ports (26). A valve member which may be in the form of a piston sleeve (24) is mounted in the bore (20) and is movable relative to the body (12) between a first position in which fluid may flow through the port (26) and a second position in which the valve member (24) closes the port (26), the valve member being movable between the first and second positions by application of differential fluid pressure. Movement of the valve member (24) is provided by a cam arrangement including a circumferentially extending cam groove (56) and a cam follower (57).
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