Gripping arrangement for gripping casing

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 19/16 (2006.01) B25B 1/24 (2006.01)

Patent

CA 2278935

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 am 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).

L'invention concerne un dispositif de serrage (7) de garniture qui, tout en étant suffisamment souple pour épouser la forme de la garniture, est sensiblement peu élastique. Selon un mode de réalisation préféré, le dispositif de serrage présente une feuille de papier zircon (9) fixée sur un disque d'entraînement (8) en métal souple dont les rebords latéraux (11) s'ajustent dans un évidement (3) incurvé d'un bloc-mâchoires (2) et s'appuient contre les extrémités d'un coussin incurvé (4) en caoutchouc élastique. A l'utilisation, les forces radiales se répartissent uniformément dans le coussin incurvé (4), les forces circulaires de la périphérie se transmettant au coussin incurvé (4) via le disque d'entraînement (8) en métal flexible et les rebords latéraux (11), et du coussin incurvé (4) au bloc-mâchoires (2).

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