Vitec Group, Plc

Robin Andrew Sayer

Richard Arthur Lindsay

The disclosure relates to a rotary drag device having relatively rotatable members one (,) of which has a stack (,) of closely spaced, thin-walled flexible annular plates (,) peripherally mounted thereon to provide annular running faces and a viscous fluid filling the spaces between the plates, and the other (,) of which members has a stack (,) of segmental plates (,) having part-annular running faces interleaved with the annular plates to slide between the plates with relative rotation of the members. Slits (,) in the annular plates permit release of viscous fluid from between the plates as fluid pressure rises ahead of the segmental plates with increasing relative speed between the members. The flexibility of the annular plates allowing the plates to close together accommodating the loss of viscous fluid from between the plates whereby the damping characteristic of the device can vary between viscous drag between the relative running surfaces of the annular and segmental plates at low relative speeds of the members and, with loss of viscous fluid from between the plates, can change to boundary lubrication between the running surfaces of the respective plates at higher relative speeds of rotation of the members.

Rotary drag devices

The disclosure relates to an extendible arm for a camera stand or the like, comprising an outer elongate rigid sleeve and an inner elongate rigid sleeve telescopically slidable with respect to the outer sleeve to extend therefrom by a variable amount. One end of the inner sleeve disposed within the outer sleeve has a detent mechanism for locking the inner sleeve in any of a number of positions of extension with respect to the outer sleeve and a release member for the detent mechanism is provided at the other end of the inner sleeve which projects from the outer sleeve with a connection between the release member and detent mechanism extending through the inner sleeve for remote operation of the detent mechanism by the release member.

Growing community of inventors

Bury St. Edmunds, United Kingdom

Robin Andrew Sayer