Internal pipe wrench

Details Internal pipe wrench Internal pipe wrench

2005-04-05

2005-04-05

Banks, Derris H. (Department: 3722)

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

C081S442000

Reexamination Certificate

active

06874393

ABSTRACT:
The invention is a pipe wrench product for rotating a hollow object, such as a pipe and a tube, by engaging the object interior. The product uses the interaction when contacting between shape-wise distinguishable curved driving and driven surfaces to control the direction of force transmitted from the product to the object. The product is designed to minimize any distortion to the shape of the object caused by the product and to maximize the turning force transmitted to the object by the product.

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patent: 5129291 (1992-07-01), Poniatowski
patent: 5207131 (1993-05-01), Pool
patent: 6675679 (2004-01-01), Dugan

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