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US 4,543,695 AGranted
Jewelry clutch
OwnerEdmund Dorseyinventor
Life of this patent
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OwnerEdmund Dorseyinventor
Estimating the term…
A clutch is disclosed consisting of two parts, the first part being a tubular shell closed at one end, the shell having therein a resilient female clutch member that is held in position by lips on the open end of the shell. A male member is provided which is adapted to be received within the resilient member. The resilient member within the shell is cylindrical of a longitudinal dimension less than the space within the shell and of an outside diameter less than the inside diameter of the shell. The male member is made of a size so that the sum of its diameter plus the wall thickness of the resilient clutch member is greater than the inside diameter of the tubular shell, so as to create an airtight joint when the male member is inserted within the resilient member, but yet permitting air to escape around the outside of the resilient member and retarded ony when disengagement is attempted, at which time the resilient clutch member will seal against the lip of the tubular shell.
A clutch comprising a tubular shell closed at one end to define an open cavity, a resilient stretchable tubular clutch member having a through bore and an outer transverse dimension smaller than the inner transverse dimension of the cavity loosely retained in the cavity, a stud of a tranverse dimension larger than the inner transverse dimension of the clutch member and adapted to be inserted and withdrawn from the clutch member with the external and internal surfaces, respectively, of said stud and clutch member in sealing relation to each other, whereby the resilient clutch member expands in said shell during insertion of said stud, yet allows release of displaced air from said shell, said shell having peripheral lip means at the open end of the cavity and being imperforate except for said open end, means at the inner end of the cavity providing a passageway for air from the bore of the tubular clutch member to the wall of said shell, whereby, as the stud is withdrawn, the clutch member seals against the lip means and a partial vacuum occurs thereby resisting disengagement.
Dependencies are inferred from the claim text.