Jarring tool
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United States of America Patent
Stats
-
Jan 22, 1985
Grant Date -
N/A
app pub date -
Oct 23, 1981
filing date -
Oct 23, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An oil field jar includes a barrel and mandrel selectively interconnected by a ball transfer mechanism so that pulling upwardly on the jar causes a ring spring assembly to be stressed. As the spring assembly reaches its limit of stroke, the ball transfer mechanism trips so that the mandrel moves relatively freely with respect to the barrel. A hammer and an anvil carried by the mandrel and barrel then impact to create an upwardly directed jar on the fish to which the tool of this invention is connected. The ball transfer mechanism includes a plurality of balls which move both axially and radially of the tool during operation.
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