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US 6,183,022 B2Granted
Tube coupling bodies
OwnerJohn Derek Guestinventor
Life of this patent
Estimating the term…
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OwnerJohn Derek Guestinventor
Estimating the term…
The disclosure relates to a tube coupling body having a throughway open at one end to receive a tube and an insert sleeve to fit in the throughway adjacent the open end with one end of the sleeve located within the throughway and the other end at the end open of the throughway. The insert sleeve has a tapered internal cam surface reducing towards said other end of the sleeve with which fingers of a tube gripping collet are engageable to receive and lock a tube inserted into the throughway in the coupling body. The external surface of the sleeve has an annular groove with a metal grab ring embedded in the sleeve adjacent the side of the groove nearest said one end of the sleeve and having multiple teeth around its outer periphery projecting radially beyond the outer surface of the sleeve on insertion of the sleeve in the throughway, the resilient teeth are angled towards said other end of the sleeve by engagement with the surface of the throughway, the angling of the fingers being accommodated by the annular groove and the resilience of the teeth causes the teeth to grip with the surface of the throughway to prevent the insert sleeve from being withdrawn from the throughway.
A cylindrical attachment for locking in a bore, the attachment having an external surface formed with an annular groove which has one side nearest one end of said attachment, and a metal grab ring in the attachment, said grab ring having multiple resilient fingers around an outer periphery of said ring projecting radially beyond the external surface of the attachment, said resilient fingers lying substantially in a plane, the ring being located adjacent said one side of said groove so that on insertion of the attachment into a throughway, the resilient fingers are flexed and spaced away from said one side of said groove and are thereby moved out of said plane and angled towards the other end of the attachment by engagement with a surface of the throughway, the flexing of the fingers being accommodated by the annular groove and the resilience of the fingers causing the fingers to grip a surface of the throughway to prevent the attachment from being withdrawn from the throughway.
Dependencies are inferred from the claim text.