US3865422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lifting devices
Assignee: Individual
•
Filing: 1974-05-08
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Granted: 1975-02-11
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Expires: 1994-05-08
Abstract
Abstract A lifting device comprises a lifting beam formed by two opposed members, for example I or U-section. Self-locking carriages are movable along the beam internally thereof and include lugs engageable with upper and lower flanges of the members. A shaft carried by each carriage is engaged by a beam suspension member or a load supporting hook, and the load applied to the carriage via the shaft urges the lugs into locking engagement with the flanges.
Inventors
- 👤 Jean-Francois Archer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:39
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
84 words
In a lifting device a lifting beam, said beam comprising two sectioned members, each said member having an upper flange, a lower flange, and a web, the two members being arranged with their webs in spaced parallel relation, and at least two self-locking carriages movable along the beam between the webs of said members, each carriage including means defining a cavity open to the outside, shaft means engaged in said cavity, and lug means bearing against the upper and lower flanges of the members.
Claim 2
Dependent Claim
84 words
In a lifting device a lifting beam, said beam comprising two sectioned members, each said member having an upper flange, a lower flange, and a web, the two members being arranged with their webs in spaced parallel relation, and at least two self-locking carriages movable along the beam between the webs of said members, each carriage including means defining a cavity open to the outside, shaft means engaged in said cavity, and lug means bearing against the upper and lower flanges of the members.
Claim 3
Dependent Claim
56 words
A device according to claim 1, wherein each said carriage comprises two plates, and a transverse Member connecting the plates, each plate lying adjacent a web of a respective said member and carrying a first lug bearing against the upper flange of the member, and a second lug bearing against the lower flange of the member.
Claim 4
Dependent Claim
65 words
A device according to claim 2, further comprising lifting hooks, each hook being carried by the shaft means of a respective carriage, in each said carriage the first lugs and the shaft means being arranged at respective sides of the second lugs whereby a load carried by the hook pivots the carriage on the second lugs to urge the first lugs against the upper flanges.
Claim 5
Dependent Claim
69 words
A device according to claim 2 further comprising suspension means for suspending the beam, said suspension means being connected to the shaft means of the carriages, in each said carriage the second lugs and the shaft means being arranged at respective sides of the first lugs whereby the load in said suspension means pivots the carriage on the first lugs to urge the second lugs against the lower flanges.
Claim 6
Dependent Claim
108 words
In a lifting device a lifting beam, said beam comprising two sectioned members, each said member having an upper flange, a lower flange, and a web, the two members being arranged with their webs in spaced parallel relation, at least two self-locking carriages movable along the beam between the webs of said members, each carriage including means defining a cavity, shaft means engaged in said cavity, and lug means bearing against the upper and lower flanges of the members, said shaft means being arranged to carry a load applied by means extending between said members whereby said load urges the lug means into locking engagement with the flanges.
Claim 7
Dependent Claim
108 words
In a lifting device a lifting beam, said beam comprising two sectioned members, each said member having an upper flange, a lower flange, and a web, the two members being arranged with their webs in spaced parallel relation, at least two self-locking carriages movable along the beam between the webs of said members, each carriage including means defining a cavity, shaft means engaged in said cavity, and lug means bearing against the upper and lower flanges of the members, said shaft means being arranged to carry a load applied by means extending between said members whereby said load urges the lug means into locking engagement with the flanges.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |