US3867803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat joist truss with rounded load-transfer surfaces
Assignee: Richardson Lumber Co
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Filing: 1973-09-27
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Granted: 1975-02-25
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Expires: 1993-09-27
Abstract
Abstract This invention relates to an improved light metal plateconnected flat joist truss and, more specifically, to a truss of the type aforementioned wherein novel webs are used characterized by rounded load-transfer surfaces on both ends that adjoin one another in a zigzag pattern while mating in strut-forming relation with the parallel chordal elements supported thereby so as to produce uniform essentially line contact between all abutting surfaces.
Inventors
- 👤 Bruce W Platt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:36
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/12; E04C3/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A plate-connected flat joist truss which comprises: a first elongate timber defining a lower chord member with an upwardlyfacing planar bearing surface; a second elongate timber defining an upper chord member with a downwardly-facing planar bearing surface; a plurality of relatively shorter web-forming timbers arranged in end-to-end oppositely-inclining relation between the upper and lower chord members cooperating to define a zigzag strut subassembly, said webs each having the surfaces on both ends thereof in contact with one another and with opposed bearing surfaces of the chord members rounded to establish essentially line contact therewith irrespective of the resultant angle of inclination each assumes within the strut subassembly; and, a pair of plates fastened on opposite sides of each joint thus formed effective to maintain same in assembled relation.
Claim 2
Dependent Claim
128 words
A plate-connected flat joist truss which comprises: a first elongate timber defining a lower chord member with an upwardlyfacing planar bearing surface; a second elongate timber defining an upper chord member with a downwardly-facing planar bearing surface; a plurality of relatively shorter web-forming timbers arranged in end-to-end oppositely-inclining relation between the upper and lower chord members cooperating to define a zigzag strut subassembly, said webs each having the surfaces on both ends thereof in contact with one another and with opposed bearing surfaces of the chord members rounded to establish essentially line contact therewith irrespective of the resultant angle of inclination each assumes within the strut subassembly; and, a pair of plates fastened on opposite sides of each joint thus formed effective to maintain same in assembled relation.
Claim 3
Dependent Claim
34 words
The flat joist truss as set forth in claim 1 in which: the rounded contacting surfaces are cylindrical and lie tangent to the surface in mated engagement therewith along essentially the entire length thereof.
Claim 4
Dependent Claim
35 words
The flat joist truss as set forth in claim 1 in which: the corners on both ends of each web member are rounded about spaced substantially parallel axes to define separate quarter rounded cylindrical surfaces.
Claim 5
Dependent Claim
31 words
The flat joist truss as set forth in claim 1 in which: both ends of each web member are rounded about a pair of longitudinally-spaced parallel axes to define semicylindrical surfaces.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |