Reduced weight power tong for turning pipe

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 19/16 (2006.01)

Patent

CA 2722796

A power tong body having a central open-ing comprises upper and lower cover plates and a rotary gear contained there between. The tong incorporates the centering guide, e.g. rollers, that extend between the ro-tary gear and respective tong covers. Such centering guides through the central openings in the tong body cov-ers and provide contact surfaces carried that permit differ-ential rotation of the rotary gear with respect to such cov-ers. The rollers may roll on circular races formed by the inside edge face surfaces of the tong covers bordering the central opening. The support rollers may also extend be-yond the upper and lower cover plates and engage with a guide surface or race formed on the respective cage plates of the tong, centrally locating such cage plates with re-spect to the rotary gear while allowing differential rota-tion of the cage plates with respect to the rotary gear.

La présente invention concerne un corps de pince de puissance qui comporte une ouverture centrale qui comprend des plaques de couverture supérieure et inférieure et un engrenage rotatif qui est contenu entre lesdites plaques. La pince incorpore un guidage de centrage, par exemple des rouleaux, sétendant entre lengrenage rotatif et les couvercles de pince respectifs. De tels guidages de centrage à travers les ouvertures centrales dans les couvercles du corps de pince fournissent des surfaces de contact supportées qui permettre une rotation différentielle de lengrenage rotatif par rapport à ces couvercles. Les rouleaux peuvent rouler sur des chemins circulaires formés par les surfaces de côté de bord intérieur des couvercles de pince qui bordent louverture centrale. Les rouleaux de support peuvent également sétendre au-delà des plaques de couverture supérieure et inférieure et entrer en prise avec une surface ou un chemin de guidage formé sur les plaques de cage respectives de la pince, positionnant ces plaques de cage de façon centrale par rapport à lengrenage rotatif, tout en permettant une rotation différentielle des plaques de cage par rapport à lengrenage rotatif.

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