| 摘要 |
A pipe wrench with: reasonable coordination on distance between - center of arcuate teeth and link-hole, eccentric length of tips of arcuate teeth and link-hole; instant grip and release, time-saving, power-saving, easy operation is disclosed. It is composed of heading-hook, main body, arcuate jaw-block, spring-guard plate, spring, oil-rope, pin and screw bolt. The jaw-block designed by two (2) different sizes of arc is inlaid in slot B on handle, due to designed size of link-hole being eccentric from center of arcs of jaw-block is well coordinated with arcs on tip teeth of jaw-block, which enables this invention with reliable and firm self-lock on workpiece as well as its open-width being enlarged.
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