Invention Grant
US09200495B2 Assembly and method for wide catch overshot 有权
装配和方法广泛捕捉

Assembly and method for wide catch overshot
Abstract:
A grapple for use in an overshot has a tension ring with a reduced helix diameter but the helix diameter is not reduced on either sides of the control finger slot. One embodiment includes expansion blades on the inner diameter (“ID”) of the tension ring to allow the grapple to expand substantially before the fish reaches the segments. An embodiment provides for a control with an offset finger to allow the guide thread ID to be smaller than the bowl helix major ID. Also provided is grapple control for a spiral grapple that has at least one gap to allow the grapple control to be more compliant during fishing operations. The control may include one or more bridges of reduced thickness. Alternate embodiments include gaps and support bands with or without bridges and/or a backup ring to help eliminate misalignment of the grapple control with the support shoulder of the overshot guide.
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