Patent US3590547A successfully refreshed from Google Patents.
US3590547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casings for joists, columns and other structural members
Assignee: Individual
•
Filing: 1968-10-21
•
Granted: 1971-07-06
•
Expires: 1988-10-21
Abstract
Abstract A fireproof casing for a steel joist with flanges including a number of precast concrete blocks formed with interengaging undercut surfaces to interlock around the joist and each block capable of being positioned transversely on the joist and of interlocking with the other blocks by longitudinal movement. The interlocking surfaces of the blocks are tapered to provide a wedging effect and in one embodiment the blocks are arranged to support further horizontal joists purely in compression against a flange of the main joist.
Inventors
- 👤 George Molyneux
- 👤 George Walter Molyneux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:44
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; E04B1/941; E04B1/943; E04B1/944
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
A metallic structural member having a web and a perpendicular flange, and a fireproof casing on said member, said casing comprising a plurality of generally U-shaped fire-insulating shell members extending longitudinally over a limited length of said structural member, each shell member having a surface engaging against the outer surface of said flange, and two wing formations which extend around the opposite edges of said flange and have undercut inwardly directed locking surfaces, and a plurality of fire-insulating locking members, each engaging against the opposite surface of said flange, and against said web, and also having a cooperating locking surface engaging with the locking surface of an adjacent one of said shell members, the said cooperating locking surfaces on said shell members and locking members extending from end to end of the shell members and locking members and being inclined longitudinally towards the plane of said flange, whereby longitudinal movement of a locking member relative to one of said shell members in position against a structural member moves said inclined locking surfaces upon each other with a wedge action that causes progressively increasing tightening of said locking member and said shell member against the intervening flange of said structural member.
Claim 2
Dependent Claim
200 words
A metallic structural member having a web and a perpendicular flange, and a fireproof casing on said member, said casing comprising a plurality of generally U-shaped fire-insulating shell members extending longitudinally over a limited length of said structural member, each shell member having a surface engaging against the outer surface of said flange, and two wing formations which extend around the opposite edges of said flange and have undercut inwardly directed locking surfaces, and a plurality of fire-insulating locking members, each engaging against the opposite surface of said flange, and against said web, and also having a cooperating locking surface engaging with the locking surface of an adjacent one of said shell members, the said cooperating locking surfaces on said shell members and locking members extending from end to end of the shell members and locking members and being inclined longitudinally towards the plane of said flange, whereby longitudinal movement of a locking member relative to one of said shell members in position against a structural member moves said inclined locking surfaces upon each other with a wedge action that causes progressively increasing tightening of said locking member and said shell member against the intervening flange of said structural member.
Claim 3
Dependent Claim
67 words
A structure according to claim 1, in which the metallic structural member is of I-section having a further perpendicular flange at the other edge of said web, including a further plurality of like shell members arranged to engage the said further flange of said structural member, and to be tightened into engagement therewith by relative longitudinal movement of like fire-insulating locking members formed with inclined locking surfaces.
Claim 4
Dependent Claim
30 words
A structure according to claim 2, wherein the shell members engaging the opposite flanges of said structural member are spaced apart from each other, and separated by said locking members.
Claim 5
Dependent Claim
23 words
A structure according to claim 2, wherein said shell members and said locking members contact the whole external surface of said structural member.
Claim 6
Dependent Claim
35 words
A structure according to claim 1, wherein said locking surfaces are also inclined both to said web and to said flange thereby to tighten said locking members both against said web and against said flange.
References Cited (Backward Citations)
US219120A
Cited
US338512A
Cited
GB105191A
Cited
FR674353A
Cited
US2074463A
Cited
US2016382A
Cited
GB550434A
Cited
US2664739A
Cited
US2580174A
Cited
BE672330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |