US3884328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scaffold plank
Assignee: WILLIAMS FORM ENGINEERING Corp A MI CORP
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Filing: 1973-10-01
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Granted: 1975-05-20
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Expires: 1993-10-01
Abstract
Abstract An extrudable cross-section is adapted for use as a scaffold plank. Bending stiffness is obtained by using an undulated crosssectional configuration that is stackable without jamming. A plurality of these planks may be interengaged along the edges for transfer of forces so that each plank is assisted by those adjacent to it.
Inventors
- 👤 Chester I Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:09
CPC Classifications
E; E04; E04G; E04G1/00; E04G1/15; E04G1/152; E04G2001/156
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
246 words
A stackable scaffolding plank having a cross-section adapted for extrusion, said scaffold plank having a plurality of inclined first and second web portions and a plurality of upper and lower sections interconnecting adjacent web portions at the points of closest proximity therebetween, said sections and web portions being disposed to define an undulated configuration, wherein the improvement comprises: a first interlock portion extending along one edge of said plank and including an outer flange coplanar with said lower sections, the free edge of said outer flange having an edge offset, and an inner flange spaced from, extending paralLel to, and shorter than, said outer flange; a second interlock portion, extending along the opposite edge of said plank from said first interlock portion, adapted to mate with the first interlock portion of an adjacent scaffold plank, and including a flange having a part thereof extending parallel to and receivable between said inner and outer flanges of the first interlock portion of said adjacent similar plank, said part of said flange being spaced from the plane of said lower sections by a distance substantially equal to the thickness of said outer flange, and also having a recess normally receiving the edge offset of said similar plank; and abutment means disposed at intermediate positions on said first and second web portions to engage said lower sections of a similar plank with said undulated configurations interengaged, said abutment means extending laterally to limit the depth of interengagement of said configurations.
Claim 2
Dependent Claim
246 words
A stackable scaffolding plank having a cross-section adapted for extrusion, said scaffold plank having a plurality of inclined first and second web portions and a plurality of upper and lower sections interconnecting adjacent web portions at the points of closest proximity therebetween, said sections and web portions being disposed to define an undulated configuration, wherein the improvement comprises: a first interlock portion extending along one edge of said plank and including an outer flange coplanar with said lower sections, the free edge of said outer flange having an edge offset, and an inner flange spaced from, extending paralLel to, and shorter than, said outer flange; a second interlock portion, extending along the opposite edge of said plank from said first interlock portion, adapted to mate with the first interlock portion of an adjacent scaffold plank, and including a flange having a part thereof extending parallel to and receivable between said inner and outer flanges of the first interlock portion of said adjacent similar plank, said part of said flange being spaced from the plane of said lower sections by a distance substantially equal to the thickness of said outer flange, and also having a recess normally receiving the edge offset of said similar plank; and abutment means disposed at intermediate positions on said first and second web portions to engage said lower sections of a similar plank with said undulated configurations interengaged, said abutment means extending laterally to limit the depth of interengagement of said configurations.
Claim 3
Dependent Claim
37 words
A plank as defined in claim 1, wherein said upper sections are substantially greater in width than said lower sections, and said abutments are disposed to receive said lower sections on stacking a plurality of said planks.
References Cited (Backward Citations)
US3466832A
Cited
US3368315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |