Low friction power tong jaw assembly

Details Low friction power tong jaw assembly Low friction power tong jaw assembly

B - Operations, Transporting

25

B

B25B 13/50 (2006.01) E21B 19/16 (2006.01)

Patent

CA 2289199

The present invention provides an improved power tong jaw (20) having a jaw body (21) with a roller aperture (23) formed therein. A jaw roller (22) is positioned in the roller aperture (23) by some type of retaining surface (35), such as a roller pin (36). Additionally, a friction reducing surface (31) is formed between the jaw roller (22) and the jaw pin (36). In one embodiment, this friction reducing surface (31) comprises a plurality of needle bearings (26). In alternate embodiments, the friction reducing surface (31) comprises ball bearings (40), journal bearings (46, 47), or recirculating ball bearings (49).

La présente invention concerne une mâchoire (20) améliorée de clé de vissage à commande pneumatique, qui comporte un corps de mâchoire (21) comportant une ouverture (23) pour galet formée à l'intérieur de celui-ci. Un galet (22) de mâchoire est placé dans l'ouverture (23) pour galet au moyen d'un certain type de surface de rétention (35), tel un axe (36) de galet. De plus, une surface (31) de réduction de frottement est formée entre le galet (22) de mâchoire et l'axe (36) de galet: dans un mode de réalisation préféré, cette surface (31) de réduction de frottement comporte plusieurs roulements (26) à aiguilles. Dans d'autres modes de réalisation, la surface (31) de réduction de frottement comporte des roulements (40) à billes, des paliers (46, 47) lisses, ou des roulements (49) à billes circulantes.

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