The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 18, 2011
Filed:
Jun. 02, 2006
Per A. Vatne, Kristiansand, NO;
Per A. Vatne, Kristiansand, NO;
Wellquip AS, Kristiansand, NO;
Abstract
A hydraulic circuit device for activating the at least one clamping die () of a power tong (), the power tong () including two housing halves (), pivotable relative to each other, the housing halves () being arranged to be pivoted between a closed, active position and an open, inactive position, and a radially divided drive ring () which is provided with the at least one hydraulically activated clamping die () directed towards the centre axis () of the power tong (), being placed in the housing halves (), the drive ring () being supported and connected to at least one driving motor () for the rotation of the drive ring () about the centre axis (), and a hydraulic pump cylinder () being articulatedly connected between the first drive ring part () of the drive ring () and the second drive ring part () of the drive ring () and arranged to rotate together with the drive ring () about the centre axis ().