Patent US4673453A successfully refreshed from Google Patents.
US4673453A
Expired / Lapsed
US
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Method of making a structural body
Assignee: Hydro Betong AB
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Filing: 1984-05-02
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Granted: 1987-06-16
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Expires: 2004-05-02
Abstract
Abstract A structural body is composed of a number of sections which are placed on one another and joined together. According to the invention, the sections, which consist of urethane foam or like plastic material, are provided, at least on one side and preferably on both sides, with a thin metal sheeting, and that the various sections are so shaped that their joining faces are congruent. The superposed sections, the joining faces of which are congruent, are cut out of sheets by means of a preferably computer-controlled laser.
Inventors
- 👤 Hans C. Georgii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:06
CPC Classifications
B; B29; B29C; B29C65/00; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/114; B29C66/1142; B29C66/40; B29C66/41; B29C66/43; B29C66/435; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/7232; B29C66/72321; B29C69/00; B29C69/001; B63; B63B; B63B5/00; B63B5/24; B63B73/00; B63B73/40; B63B73/46; B63B73/70; B29C48/00; B29C48/001; B29C48/0022; B29C48/03; B29C48/07; B29C48/08; B29C48/131; B29C66/727; B29K; B29K2075/00; B29K2105/00; B29K2105/04; B29L; B29L2031/00; B29L2031/30; B29L2031/3067; B29L2031/307; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1066; Y10T156/1075
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
194 words
A method of making a structural body having a complex shape, the steps of which comprise: providing sheet material comprising a foamed plastic core sandwiched between two layers of thin metal sheeting for providing tensile and compressive strength; selecting a pattern of laterally joined sections, the whole of said pattern corresponding to said shaped body; cutting said sheet material into a plurality of shaped sections, each section corresponding to a section of said pattern and some of which differ in configuration from one another, by engaging a first laser on one side of the sheet and a second laser in opposition to said first laser on an opposing side of said sheet, said first and second lasers being controlled by a computer to produce said plurality of shaped sections with planar faces so that said sections can be assembled side-by-side with adjacent faces which are congruent; joining said plurality of shaped sections together with pairs of congruent faces in side-by-side contact to form a structural laminated body having curved surfaces and a variable cross-section; and providing on at least one surface of said structural laminated body a surface layer to provide increased mechanical strength.
Claim 2
Independent Claim
194 words
A method of making a structural body having a complex shape, the steps of which comprise: providing sheet material comprising a foamed plastic core sandwiched between two layers of thin metal sheeting for providing tensile and compressive strength; selecting a pattern of laterally joined sections, the whole of said pattern corresponding to said shaped body; cutting said sheet material into a plurality of shaped sections, each section corresponding to a section of said pattern and some of which differ in configuration from one another, by engaging a first laser on one side of the sheet and a second laser in opposition to said first laser on an opposing side of said sheet, said first and second lasers being controlled by a computer to produce said plurality of shaped sections with planar faces so that said sections can be assembled side-by-side with adjacent faces which are congruent; joining said plurality of shaped sections together with pairs of congruent faces in side-by-side contact to form a structural laminated body having curved surfaces and a variable cross-section; and providing on at least one surface of said structural laminated body a surface layer to provide increased mechanical strength.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherein said foamed plastic core is urethane foam.
Claim 4
Dependent Claim
25 words
A method according to claim 1 wherein said surface layer for said structural laminated body comprises metal which is adhered to said body by glueing.
Claim 5
Dependent Claim
18 words
A method according to claim 1 wherein said surface layer is a surface coating comprising woven glass fabric.
Claim 6
Dependent Claim
20 words
A method according to claim 1 wherein said thin metal sheeting has a thickness between about 0.7 and 1 mm.
Claim 7
Dependent Claim
16 words
A method according to claim 1 wherein said joining of shaped sections is effected by glueing.
Claim 8
Dependent Claim
16 words
A method according to claim 5 wherein said joining of shaped sections is effected by glueing.
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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) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |