Tentec Limited

Michael Gethings

David Evans

A tensioner, typically hydraulic, for threaded members, the tensioner comprising: a base () and a piston () defining a pressure space () therebetween, the base () and piston () being arranged to be urged apart along an axis () upon introduction of a fluid into the pressure space (); and a thread-engaging member (), comprising a body portion () of the form of a sleeve and having a threaded interior () for engagement with a threaded member () and a piston engaging portion () carrying a protrusion; in which the piston () bears against the protrusion such that the piston () exerts a force on the protrusion when urged apart from the base () by the introduction of fluid into the pressure space (); the tensioner further comprising a displacement sensor arranged to determining the relative position of the body portion of the thread-engaging member and the base, the displacement sensor comprising a first part () carried on the base () and a second part () carried on the body portion (); typically the displacement sensor is a magnetic encoder.

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Wolverhampton, United Kingdom

Michael Gethings