Patent US1537013A successfully refreshed from Google Patents.
US4423978A
Expired / Lapsed
US
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Shelving construction
Assignee: Richards Wilcox Inc
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Filing: 1981-11-02
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Granted: 1984-01-03
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Expires: 2001-11-02
Abstract
Abstract A knockdown metal shelving assembly is disclosed. Upright frame members providing vertical series of equidistantly spaced keyhole slots are interconnected by horizontally extending shelf supports. Interconnection portions of the shelf supports are punch pressed to provide tablike projections that are inserted and retained in associated keyhole slots in the frame members. Each tablike projection includes an arcuate load-bearing portion that rests in contiguous relationship throughout its extent on a corresponding arcuate edge along the bottom of the keyhole slot. That portion of the keyhole slot receiving the load-bearing portion of the tablike projection is slightly undersized to provide an interference fit for lockably retaining the projection in the slot.
Inventors
- 👤 Gabriel Tiegelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:35
CPC Classifications
A; A47; A47B; A47B57/00; A47B57/30; A47B57/40; F; F16; F16B; F16B2200/00; F16B2200/20; F16B2200/205
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
A structure for interconnecting elements of a metal shelving assembly comprising: a vertically extending slot provided by one of the elements, the slot having an arcuate edge along its lower end; and a punch press-formed, tablike projection provided as an integral portion of another of the elements, the projection being received by and retained in the slot, the projection including an arcuate load-bearing surface resting on the arcuate edge of the slot in contiguous relationship at all interface points between the arcuate edge and the arcuate load-bearing surface.
Claim 2
Dependent Claim
88 words
A structure for interconnecting elements of a metal shelving assembly comprising: a vertically extending slot provided by one of the elements, the slot having an arcuate edge along its lower end; and a punch press-formed, tablike projection provided as an integral portion of another of the elements, the projection being received by and retained in the slot, the projection including an arcuate load-bearing surface resting on the arcuate edge of the slot in contiguous relationship at all interface points between the arcuate edge and the arcuate load-bearing surface.
Claim 3
Dependent Claim
36 words
A structure according to claim 1, wherein that portion of the slot receiving and engaging the projection is undersized to provide an interference fit with the projection to releasably lock the elements together in assembled relationship.
Claim 4
Dependent Claim
59 words
A structure according to claim 1, wherein the tablike projection includes a tongue portion extending downwardly from the arcuate load-bearing surface, the tongue portion being spaced from said another element, the space receiving a portion of said one of the elements to maintain the position of the load-bearing surface in engagement with the arcuate lower edge of the slot.
Claim 5
Dependent Claim
48 words
A structure according to claim 3, wherein the distal end of the tongue portion is arcuate, the radii of curvature of the arcuate load-bearing surface, the arcuate edge, and the distal end of the tongue portion being equal to facilitate insertion of the tablike projection into the slot.
Claim 6
Dependent Claim
29 words
A structure according to claims 3 or 4, wherein the slot is a keyhole slot having a larger width across its top section as compared to its bottom section.
Claim 7
Dependent Claim
26 words
A structure according to claim 5, wherein the width of the tongue portion is substantially less than the width of the top section of the slot.
Claim 8
Dependent Claim
18 words
A structure according to claim 6, wherein the width of the tongue portion is constant throughout its length.
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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |