A gripping arrangement (7) for gripping casing is both sufficiently flexible to conform to said casing and substantially inelastic. In a preferred embodiment the gripping arrangement (7) comprises a sheet of zircon paper (9) bonded to a flexible metal carrier plate (8) which has side flanges (11) which fit into an arcuate recess (3) in a jaw holder (2) and bear against the ends of an arcuate pad (4) of resilient elastomeric material. In use, radial forces are applied uniformly through the arcuate pad (4) whilst circumferential forces are transmitted through the flexible metal carrier plate (8) and the side flanges (11) to the arcuate pad (4) and thus to the jaw holder (2).
申请公布号
WO9834004(A1)
申请公布日期
1998.08.06
申请号
WO1998GB00224
申请日期
1998.01.26
申请人
WEATHERFORD/LAMB, INC.;LUCAS, BRIAN, RONALD;PIETRAS, BERND-GEORG;SCHULZE-BECKINGHAUSEN, JOERG-ERICH;CARLSSON, ANDREAS
发明人
PIETRAS, BERND-GEORG;SCHULZE-BECKINGHAUSEN, JOERG-ERICH;CARLSSON, ANDREAS