US4897299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grating of fiber reinforced plastic
Assignee: DAINIPPONINK & CHEMICALS Inc 35-38 SAKASHITA 3 CHOME ITABASHI-KU TOKYO JAPAN
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Filing: 1988-07-26
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Granted: 1990-01-30
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Expires: 2008-07-26
Abstract
Abstract A grating of fiber reinforced plastic comprising a plurality of main beams of substantially I-shape in section made of fiber reinforced plastic and arranged in parallel to one another, and grid members also made of fiber reinforced plastic and engaged with the plurality of main beams to be integrally fixed to one another. By such a construction, there is produced an a cooperation between the high strength of the main beams and the load transmission performance of the grid members resulting in higher strength than conventional gratings of the same material. Individual components of the grating are suited for standardization and mass production, and besides gratings of various length and width are achieved by variation in the combination of the components.
Inventors
- 👤 Hideji Kawachi
- 👤 Fumiyoshi Yamada
- 👤 Toshiyasu Fukuya
- 👤 Tetsuro Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:14
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/42; E04C2/421; E04C2/422; E04C2/425; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24339
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
A grating of fiber reinforced plastic, comprising: a plurality of main beams having an I-shaped cross section which are made of fiber reinforced plastic and arranged in parallel to one another, each main beam having an upper flange defining an upper face and two lower back faces, a lower flange defining a bottom face and two upper back faces and a center web defining two side faces, with a bottom, lower back face of the upper flange and the top upper back face of the lower flange being inclined at a gradual slope to a side face of the center web, and a plurality of grid members which are also made of fiber reinforced plastic, each having a top face and each contacting one of said plurality of main beams at corresponding lower back, upper back and side faces to be integrally fixed thereto, such that the top face of each grid member lies in the same plane as the top face of the main beams.
Claim 2
Dependent Claim
166 words
A grating of fiber reinforced plastic, comprising: a plurality of main beams having an I-shaped cross section which are made of fiber reinforced plastic and arranged in parallel to one another, each main beam having an upper flange defining an upper face and two lower back faces, a lower flange defining a bottom face and two upper back faces and a center web defining two side faces, with a bottom, lower back face of the upper flange and the top upper back face of the lower flange being inclined at a gradual slope to a side face of the center web, and a plurality of grid members which are also made of fiber reinforced plastic, each having a top face and each contacting one of said plurality of main beams at corresponding lower back, upper back and side faces to be integrally fixed thereto, such that the top face of each grid member lies in the same plane as the top face of the main beams.
Claim 3
Dependent Claim
48 words
A grating according to claim 1, wherein the plurality of grid members each comprise a plurality of longitudinal rails and a plurality of lateral rails, and wherein either of said rails are provided with vertically extending, spaced apart, slits for receiving the other of said rails without slits.
Claim 4
Dependent Claim
26 words
A grating according to claim 1, further comprising a plurality of bolt menas for integrally fixing said main beams and said grid members to each other.
Claim 5
Dependent Claim
16 words
A grating according to claim 3, wherein said bolt means are made of fiber reinforced plastic.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |