Patent US3673913A successfully refreshed from Google Patents.
US3673913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel fastener with expandable sleeve
Assignee: Southco Inc
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Filing: 1970-09-04
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Granted: 1972-07-04
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Expires: 1990-09-04
Abstract
Abstract A second cam member has an axial clearance hole for receiving a T-shaped projection on 1 free end of a stud carrying a resilient sleeve radially expandable when axially compressed by axial displacement of a first cam member on the stud resulting from relative rotation between the cam members. The second cam member is also provided with notch means in its outer surface connected to the clearance hole by an internal helical ramp that operatively engages the projection upon rotation of the stud relative to the second cam member. Such relative rotation initially axially displaces both cam members and axially compresses the sleeve which exerts an opposite axial force on the cam members. Final relative rotation placing the stud in a predetermined angular position relative to the second cam member seats the projection in the notch means and keys the second cam member to the stud for rotation therewith. The residual axial force exerted by the sleeve maintains the projection seated in the notch means and develops a frictional force between the sleeve and first cam member that serves to prevent rotation therebetween.
Inventors
- 👤 John K Barry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:06
CPC Classifications
F; F16; F16B; F16B21/00; F16B21/02; F16B21/04; F16B5/00; F16B5/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
435 words
A panel fastener comprising: a. an axially extending headed stud having a shank portion adapted to be forwardly inserted into a through-hole in a panel, and a T-shaped portion on the free end of said shank portion having a pair of rearwardly facing cam follower surfaces projecting radially from said shank portion; b. a resilient sleeve on said stud radially expandable in response to rearward axial compression; c. a first cam member rotatable and axially displaceable on said stud forwardly of said sleeve and in engagement therewith and having a forwardly facing cam surface; and d. a second cam member on said stud forward of said first cam member and having a cam follower surface facing and engaging the cam surface on said first cam member; the cam surface and cam follower surface of said cam members comprising means being constructed and arranged so that rotation of said second cam member relative to said first cam member imparts rearward axial movement to said first cam member on said stud to thereby rearwardly axially compress said sleeve when said second cam member is held against forward axial movement; said second cam member having an axial clearance hole comprising a substantially cylindrical portion having a diameter less than the combined radial projection of said T-shaped portion of said stud and greater than the shank portion of said stud, and opposed axial slots that clear the radial projection of said Tshaped portion of said stud thereby permitting axial insertion of said second cam member over the free end of said stud; said opposed axial slots having surfaces intersecting opposed internal cam surfaces at diametrically opposed rearward edges in said second cam member and extending radially outwardly from said cylindrical portion of said clearance hole, said internal cam surfaces progressing forwardly helically and being adapted to cooperate with the follower surfaces of said T-shaped portion of said stud to provide cam action; the forward free face of said second cam member having a pair of opposed radially extending, axially blind notches formed by surfaces intersecting the internal cam surfaces at edges forward of the axially rearwardlY deepest part of said notches; e. said stud, sleeve, and cam members cooperating to provide a means for holding said second cam member against forward axial movement on said stud when the parts have been assembled as aforesaid and the stud has been rotated axially with respect to said second cam member so that the cam follower surfaces projecting from said T-shaped portion of said stud have traveled along the helical surfaces on said second cam member and are lodged in said notches.
Claim 2
Dependent Claim
435 words
A panel fastener comprising: a. an axially extending headed stud having a shank portion adapted to be forwardly inserted into a through-hole in a panel, and a T-shaped portion on the free end of said shank portion having a pair of rearwardly facing cam follower surfaces projecting radially from said shank portion; b. a resilient sleeve on said stud radially expandable in response to rearward axial compression; c. a first cam member rotatable and axially displaceable on said stud forwardly of said sleeve and in engagement therewith and having a forwardly facing cam surface; and d. a second cam member on said stud forward of said first cam member and having a cam follower surface facing and engaging the cam surface on said first cam member; the cam surface and cam follower surface of said cam members comprising means being constructed and arranged so that rotation of said second cam member relative to said first cam member imparts rearward axial movement to said first cam member on said stud to thereby rearwardly axially compress said sleeve when said second cam member is held against forward axial movement; said second cam member having an axial clearance hole comprising a substantially cylindrical portion having a diameter less than the combined radial projection of said T-shaped portion of said stud and greater than the shank portion of said stud, and opposed axial slots that clear the radial projection of said Tshaped portion of said stud thereby permitting axial insertion of said second cam member over the free end of said stud; said opposed axial slots having surfaces intersecting opposed internal cam surfaces at diametrically opposed rearward edges in said second cam member and extending radially outwardly from said cylindrical portion of said clearance hole, said internal cam surfaces progressing forwardly helically and being adapted to cooperate with the follower surfaces of said T-shaped portion of said stud to provide cam action; the forward free face of said second cam member having a pair of opposed radially extending, axially blind notches formed by surfaces intersecting the internal cam surfaces at edges forward of the axially rearwardlY deepest part of said notches; e. said stud, sleeve, and cam members cooperating to provide a means for holding said second cam member against forward axial movement on said stud when the parts have been assembled as aforesaid and the stud has been rotated axially with respect to said second cam member so that the cam follower surfaces projecting from said T-shaped portion of said stud have traveled along the helical surfaces on said second cam member and are lodged in said notches.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |