E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/27
E21B 43/00 (2006.01)
Patent
CA 1170167
Abstract of the Disclosure The invention relates to an apparatus for articulating linearly reciprocal devices. The apparatus includes a frame adapted for upright support placement and a shaft mounted for rotation in the frame in substantially horizontal alignment. Motor means are connected to assist in rotation of the shaft and a first and second substantially circular mandrel is secured in spaced relationship on the shaft. A first sheave chain is attached to the first mandrel and spirally wound upon itself in a first direction around the periphery thereof, the free end of the first sheave chain being attached to the reciprocal device. A second sheave chain is attached to the second mandrel and is spirally wound upon itself in a second direction around the periphery thereof. Counter- balancing means are connected to the free end of the second sheave chain, whereby the spiral windup of the first sheave chain is variably opposed by the second sheave chain accord- ing to the peripheries thereof to form an oscillary system.
431122
National-Oilwell L.p.
Swabey Ogilvy Renault
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