US3904298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction joint
Assignee: HOLMBOM AND HEDLUND AB
•
Filing: 1973-10-09
•
Granted: 1975-09-09
•
Expires: 1993-10-09
Abstract
Abstract A friction joint between two members which is of the type wherein one of the members may be freely rotated relative to the other member in either direction independently of a frictional coupling means which forms a part of the joint. When thereafter said one member is attempted to be rotated back to its initial position, it becomes locked in place relative to the other member and thereafter be rotated in the opposite direction only by overcoming the restraining frictional coupling.
Inventors
- 👤 Malkolm Lindgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:57
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14; B25B23/145; B25B23/1453; F; F16; F16C; F16C11/00; F16C11/04; F16C11/10; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32262; Y10T403/32319; Y10T403/32327; Y10T403/32336
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
162 words
A friction joint between two members of the type wherein one said member may be freely rotated about the other member in either direction from an initial position independently of a frictional coupling but thereafter becomes locked in place and can then be rotated in the opposite direction only by overcoming the restraining frictional coupling, said friction joint apparatus comprising: a common axle for both said members, a disc frictional coupling means mounted therein, said disc being rotatable about said axle and being in frictional engagement with a first of said members, and locking means on a second of said members and on said disc for locking said second member to said disc only when said second member has been rotated in either direction from an initial position and is thereafter urged back to its initial position, whereby said second member can be rotated back to its said initial position only by overcoming the frictional force exerted by said frictional coupling means.
Claim 2
Dependent Claim
162 words
A friction joint between two members of the type wherein one said member may be freely rotated about the other member in either direction from an initial position independently of a frictional coupling but thereafter becomes locked in place and can then be rotated in the opposite direction only by overcoming the restraining frictional coupling, said friction joint apparatus comprising: a common axle for both said members, a disc frictional coupling means mounted therein, said disc being rotatable about said axle and being in frictional engagement with a first of said members, and locking means on a second of said members and on said disc for locking said second member to said disc only when said second member has been rotated in either direction from an initial position and is thereafter urged back to its initial position, whereby said second member can be rotated back to its said initial position only by overcoming the frictional force exerted by said frictional coupling means.
Claim 3
Dependent Claim
87 words
A joint as defined in claim 1, characterized in that said locking means comprises a catch member suspended for limited pivotal movement about its mouting point on said second member, said catch member by action of gravity being brought into engagement with a toothed ring on said movable disc as said second member is rotated in either direction about said axle from an initial position, for locking said first member to said disc in response to attempted rotation of said second member back to its initial position.
Claim 4
Dependent Claim
36 words
A joint as defined in claim 2, characterized in that said catch member is provided with two projections, which are disposed symmetrically in relation to a centre line through the catch member and its mounting point.
Claim 5
Dependent Claim
31 words
A joint as defined in claim 1, characterized in that said rotatable disc is supported on said axle by means of a bushing on which said second member is freely supported.
References Cited (Backward Citations)
US253753A
Cited
US257306A
Cited
US367723A
Cited
US1140167A
Cited
US1680515A
Cited
US2214901A
Cited
US2896759A
Cited
US2940283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |