US4731279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assembly block formed from a poly-olefin foam
Assignee: Rakkasan Co Ltd
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Filing: 1987-03-16
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Granted: 1988-03-15
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Expires: 2007-03-16
Abstract
Abstract Blocks which can be used for assembling easily and inexpensively a piece of furniture or a part of a building, such as a table, stool, gate or arch. Each block comprises a molded body of a polyolefin foam having a rectangular, circular, oval or polygonal cross-section. The body has a pair of opposite surfaces of which one is provided with a plurality of regularly spaced apart holes, while the other surface is provided with a plurality of regularly spaced apart projections of which each can be fitted into one of the holes of another block. At least one bore extends through the body between the opposite surfaces thereof. The blocks are so light in weight and easy to handle that any assembly thereof can easily be dismantled for rebuilding another assembly having a different shape or structure. They are also highly resistant to water and are, therefore, suitable for building any assembly for outdoor use.
Inventors
- 👤 Tadao Isshiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:36
CPC Classifications
E; E04; E04C; E04C1/00; E04C1/39; E04C1/40; E04B; E04B2/00; E04B2/02; E04B2002/0202; E04B2002/0204; E04B2002/0215; E04B2002/0223; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24025; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24479; Y10T428/24496; Y10T428/24504
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
An assembly block comprising a molded body of a polyolefin foam having a rectangular, circular, oval or polygonal cross-section, said body having a pair of opposite surfaces of which one is provided with a plurality of regularly spaced apart holes, while the other of said surfaces is provided with a plurality of regularly spaced apart projections of which each can be fitted into one of said holes in said one surface of another block, at least one bore extending through said body between said surfaces thereof.
Claim 2
Dependent Claim
86 words
An assembly block comprising a molded body of a polyolefin foam having a rectangular, circular, oval or polygonal cross-section, said body having a pair of opposite surfaces of which one is provided with a plurality of regularly spaced apart holes, while the other of said surfaces is provided with a plurality of regularly spaced apart projections of which each can be fitted into one of said holes in said one surface of another block, at least one bore extending through said body between said surfaces thereof.
Claim 3
Dependent Claim
67 words
A block as set forth in claim 1, wherein said holes consist of two to eight holes provided in two rows and said projections consist of two to eight projections provided in two rows, one to six bores extending through said body, said or each bore having a pair of open ends located between said two rows of holes and between said two rows of projections, respectively.
Claim 4
Dependent Claim
23 words
A block as set forth in claim 1 or 2, wherein each edge of each plane defining said body has a bevelled surface.
Claim 5
Dependent Claim
56 words
A block as set forth in claim 1 or 2, wherein each surface of said body that is brought into contact with one surface of the body of another block when the blocks are put together is provided with at least two ridges having a height and a width both up to and including 5 mm.
Claim 6
Dependent Claim
107 words
An assembly block comprising a molded body of a polyolefin foam having a rectangular, circular, oval or polygonal cross-section, said body having a pair of opposite surfaces of which one is provided with a plurality of regularly spaced apart holes, while the other of said surfaces is provided with a plurality of regularly spaced apart projections of which each can be fitted into one of said holes in said one surface of another block, at least one bore extending through said body between said surfaces thereof, said body having at least one additional surface covered wholly or partly with an ornamental material, such as fabric or leather.
Claim 7
Dependent Claim
107 words
An assembly block comprising a molded body of a polyolefin foam having a rectangular, circular, oval or polygonal cross-section, said body having a pair of opposite surfaces of which one is provided with a plurality of regularly spaced apart holes, while the other of said surfaces is provided with a plurality of regularly spaced apart projections of which each can be fitted into one of said holes in said one surface of another block, at least one bore extending through said body between said surfaces thereof, said body having at least one additional surface covered wholly or partly with an ornamental material, such as fabric or leather.
Claim 8
Dependent Claim
68 words
A block as set forth in claim 5, wherein said holes consist of two to eight holes provided in two rows and said projections also consist of two to eight projections provided in two rows, one to six bores extending through said body, said or each bore having a pair of open ends located between said two rows of holes and between said two rows of projections, respectively.
Claim 9
Dependent Claim
23 words
A block as set forth in claim 5 or 6, wherein each edge of each plane defining said body has a bevelled surface.
Claim 10
Dependent Claim
56 words
A block as set forth in claim 5 or 6, wherein each surface of said body that is brought into contact with one surface of the body of another block when the blocks are put together is provided with at least two ridges having a height and a width both up to and including 5 mm.
References Cited (Backward Citations)
GB1218789A
Cited
DE1963304A1
Cited
US3857749A
Cited
US3940811A
Cited
DE2835428A1
Cited
JPS5517561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |