E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 19/16 (2006.01) B25B 13/46 (2006.01) B25B 13/50 (2006.01) F16D 41/067 (2006.01) F16D 41/069 (2006.01)
Patent
CA 2458449
Gripping apparatus comprises a plurality of axially tapered rollers (47) for engaging the gripped member; and a body having a cam surface (36) which is shaped so as to urge the rollers, when in use, against the gripped member when the rollers slide axially with respect to the cam surface. The cam surface is also shaped so as to urge the rollers, when in use, against the gripped member when the rollers roll along the cam surface.
L'invention concerne un dispositif de serrage comprenant une pluralité de cylindres axialement effilés (47) destinés à entrer en prise avec l'élément serré, ainsi qu'un corps possédant une surface de came (36) dont la forme permet de pousser les cylindres, en cours d'utilisation, contre l'élément serré lorsque lesdits cylindres coulissent axialement par rapport à la surface de came. En outre, cette surface de came présente une forme permettant de pousser les cylindres, en cours d'utilisation, contre l'élément serré lorsque lesdits cylindres roulent le long de la surface de came.
Marks & Clerk
Weatherford/lamb Inc.
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