Power tong with reduced die markings
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United States of America Patent
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Jul 3, 2007
Grant Date -
Nov 3, 2005
app pub date -
Apr 29, 2004
filing date -
Apr 29, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A power tong 10 rotates a tubular during makeup or breakout of the threaded connection. A tong frame 12, a rotatable ring 20, and a cage plate assembly may each have an open throat for receiving the tubular. A plurality of dies 32 are preferentially manufactured from aluminum, and each have a knurled surface for engaging the tubular. A fluid powered cylinder 54 increases tension between the brake band 50 and the cage plate assembly. Neutral cam portions of the cam surface one positioned radially outward substantially from the makeup and breakout cam portions.
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