US3575079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick release fastener
Assignee: Dzus Fastener Co Inc
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Filing: 1969-06-26
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Granted: 1971-04-13
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Expires: 1989-06-26
Abstract
Abstract A fastener comprises two members which are both moulded from resilient plastics material. One of the members is a stud having a cylindrical shank with a head at one end, a flat at the other end and a notch spaced away from the other end and intersecting the flat. The other member is a retaining member having a socket with a retaining web extending across a portion of the socket. To assemble the fastener the shank is inserted into the socket with the flat accommodating the web. The stud is then turned relatively to the retaining member so that the web in the socket is received in the notch in a locked position of the two members. The base of the notch intersects the flat at an acute angle so that an edge portion of the flat is undercut and the undercut edge portion is deformed by the web as the stud is turned until a dead center position is reached whereafter the stud snaps into the locked position. The stud may be formed as a bolt and the retaining member as a nut.
Inventors
- 👤 Howard John Leonard Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:04
CPC Classifications
F; F16; F16B; F16B19/00; F16B19/02; F16B21/00; F16B21/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
247 words
A fastener comprising a stud member moulded from plastics material having a cylindrical shank, a head at one end of said shank, a flat formed at the other end of said shank, and a notch spaced away from said other end and intersecting said flat, and a retaining member moulded from plastics material having a socket and a retaining web extending across a portion of said socket, said retaining member being adapted to receive said other end of said shank of said stud member with said retaining web accommodated by said flat, subsequent relative rotation between said stud member and said retaining member to a locked position of said members causing said web to be received in said notch, (and said web being adapted to interfere with the intersection between said flat and said notch during said relative rotation whereby said members are held in said locked position.) said notch having a base surface comprising two relatively inclined portions, one of said portions being remote from said intersection with said flat and being inclined at an obtuse angle to said flat and the other of said portions being close to said intersection and being inclined at an acute angle to said flat whereby an edge portion of said flat adjacent to said intersection is undercut and is deformed by said web as said stud member is turned relatively to said retaining member until a dead center position is reached whereafter said stud snaps into said locked position.
Claim 2
Dependent Claim
247 words
A fastener comprising a stud member moulded from plastics material having a cylindrical shank, a head at one end of said shank, a flat formed at the other end of said shank, and a notch spaced away from said other end and intersecting said flat, and a retaining member moulded from plastics material having a socket and a retaining web extending across a portion of said socket, said retaining member being adapted to receive said other end of said shank of said stud member with said retaining web accommodated by said flat, subsequent relative rotation between said stud member and said retaining member to a locked position of said members causing said web to be received in said notch, (and said web being adapted to interfere with the intersection between said flat and said notch during said relative rotation whereby said members are held in said locked position.) said notch having a base surface comprising two relatively inclined portions, one of said portions being remote from said intersection with said flat and being inclined at an obtuse angle to said flat and the other of said portions being close to said intersection and being inclined at an acute angle to said flat whereby an edge portion of said flat adjacent to said intersection is undercut and is deformed by said web as said stud member is turned relatively to said retaining member until a dead center position is reached whereafter said stud snaps into said locked position.
Claim 3
Dependent Claim
21 words
A fastener according to claim l, wherein said retaining member has two mounting wings and a hole formed in each wing.
Claim 4
Dependent Claim
34 words
A fastener according to claim l, wherein said stud member is in the form of a bolt, said head being of noncircular configuration, and said retaining member is in the form of a nut.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |