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US 4,907,749 AGranted
Coupling
AssigneeImperial Chemical Industries PLC
InventorsPeter C. Bennett, Rodney J. Clarke
Life of this patent
Estimating the term…
Abstract
A coupling between parts subject to differential expansion and contraction comprising first and second sealing abutments and an intervening constraint on relative movement whereby differential movements provide a self-compensating tightening and loosening of the sealing abutments. The coupling is especially useful for joining tubular parts such as caps or spray nozzles in containers for agricultural chemicals.
Claims5
A coupling comprising:
- a first tubular element having an external surface with a thread thereon;
- a second tubular element having an interior surface with a thread thereon, said threads of said first and second tubular elements have radial mating portions and cooperating in threaded engagement;
- said first tubular element threaded terminating in a first annular sealing edge;
- said second tubular element threaded surface terminating in a second annular sealing edge;
- means defining a first sealing groove in said first tubular element at a portion thereof adjacent the end of said external threaded surface opposite said first annular sealing edge, said first sealing groove dimensioned to cooperate in a sealing relationship with said first annular sealing edge;
- and
- means defining a second sealing groove in said second element adjacent the end of said interior threaded surface opposite said second annular sealing edge, for operative sealing cooperation with said first annular sealing edge.
4 more elements
Dependencies are inferred from the claim text.