Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2006-06-02
2011-10-18
Shakeri, Hadi (Department: 3727)
Tools
Wrench, screwdriver, or driver therefor
Machine
C081S057160, C081S057210, C081S057330
Reexamination Certificate
active
08037786
ABSTRACT:
A hydraulic circuit device for activating the at least one clamping die (14) of a power tong (1), the power tong (1) including two housing halves (2), pivotable relative to each other, the housing halves (2) being arranged to be pivoted between a closed, active position and an open, inactive position, and a radially divided drive ring (6, 8) which is provided with the at least one hydraulically activated clamping die (14) directed towards the centre axis (10) of the power tong (1), being placed in the housing halves (2), the drive ring (6, 8) being supported and connected to at least one driving motor (12) for the rotation of the drive ring (6, 8) about the centre axis (10), and a hydraulic pump cylinder (16) being articulatedly connected between the first drive ring part (6) of the drive ring (6, 8) and the second drive ring part (8) of the drive ring (6, 8) and arranged to rotate together with the drive ring (6, 8) about the centre axis (10).
REFERENCES:
patent: 3023651 (1962-03-01), Wallace
patent: 4732061 (1988-03-01), Dinsdale
patent: 4979356 (1990-12-01), Vatne
patent: 5159860 (1992-11-01), Pietras
patent: 6082225 (2000-07-01), Richardson
patent: 6223629 (2001-05-01), Bangert
patent: 0339005 (1989-10-01), None
patent: 92/18744 (1992-10-01), None
Written Opinion, Sep. 27, 2006, NO PCT Office.
GableGotwals
Shakeri Hadi
Wellquip AS
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