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US 3,952,568 AGranted
Vacuum processing of rod, wire or strip material
AssigneesThe Electricity Council, Johnson & Nephew (Non-Ferrous)
InventorsJoseph Brian Wareing, Herbert Hall
Life of this patent
Estimating the term…
Abstract
A seal permitting wire, rod or the like to be fed continuously into a vacuum treatment chamber comprises two die-shaped elements conforming to the peripheral shape of the wire, rod or the like in spaced holders with a tube sealed between the holders and a removable insert in the tube externally fitting closely within the tube.
Claims7
A seal permitting the feeding of a rod or wire material of predetermined uniform section through a wall separating regions at different pressures in vacuum apparatus for processing the rod or wire, said seal comprising a pair of spaced die-holders;
- a pair of die-shaped elements located one in each of said spaced die-holders, each die-shaped element being formed of a hard rigid material and being of parabolic form in axial section to have a smoothly-curved convergent entry portion leading to the narrowest portion and a smoothly-curved divergent exit portion, said die-shaped elements furthermore having dimensions to give a clearance of between 0.1 and 0.2 mm around the rod or wire to be fed therethrough;
- a tube sealed between said spaced die-holders;
- and a removable insert of non-abrasive material in said tube closely fitting within the tube, and having an opening extending therethrough for receiving the rod or wire to be fed through said seal.
Dependencies are inferred from the claim text.