Patent US3823525A successfully refreshed from Google Patents.
US3823525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam-tightened edge joint for structural panels
Assignee: Individual
•
Filing: 1971-04-30
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Granted: 1974-07-16
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Expires: 1991-04-30
Abstract
Abstract A joint for connecting two ''''sandwich'''' building elements. Each element has a locking rail on one end. The rails are in engagement with each other and have such form that they, when arranged, define one or more locking cavities. The more the rails overlap each other the larger is the cavity or cavities. In the cavity there is arranged an expanded foam body ensuring that the cavity will be as big as possible and will be filled up. This involves that the rails will overlap and cooperate efficiently so that the joint will be very tight.
Inventors
- 👤 P Bruun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:38
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/38; E04B1/61; E04B1/6108; E04B1/612; E04B1/6179; F; F16; F16B; F16B5/00; F16B5/0004; F16B5/0032; F16B5/0044
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
349 words
A joint for connecting at least two structural parts such as plate-formed building elements of the ''''sandwich'''' type, composed of two outer plates and at least one intermediate filling layer such as a foam layer, the joint comprising locking rails projecting from end surfaces of the building elements in pairs and being in engagement behind each other, webs of said rail pairs being at right angles to each other, said rails being of substantially U-formed section and turned about 180* in relation to each other, said rails defining at least one permanently closed locking cavity having solid angles of 90* at its corners, the size of said cavity being increased the more the engagement area of said rails is increased, and an expandable body of adhesive foam material in said cavity, which material, on reaching its maximum volume, presses parts of said rails at least partly into and at least partly against each other, simultaneously keeping the buidling elements tightly joined, and which foam material provides upon its expansion a tight connection between the building elements, said rails being embedded in recesses provided in said end surfaces of the respective building elements, said recesses in one building element having solid angles of 90* at their corners and being large enough to receive parts of an adjacent one of said rails of another building element, wherein one side flange of said rails is attached in said recesses, and theiR free side flanges and bottom flanges cooperate to form said cavity, said rails include parts formed integral with at least one of said outer plates and parts attached thereto, and wherein a rail of one building element is a U-shaped sectional member, from one side flange of which projects an edge flange, the latter being attached to the edge of an outer plate of the corresponding building element, so that a part of said cavity of the sectional member is laid free, whereas a rail of another building element is an L-shaped sectional member, one flange of the latter being attached to an outer corresponding plate of the other building element.
Claim 2
Dependent Claim
349 words
A joint for connecting at least two structural parts such as plate-formed building elements of the ''''sandwich'''' type, composed of two outer plates and at least one intermediate filling layer such as a foam layer, the joint comprising locking rails projecting from end surfaces of the building elements in pairs and being in engagement behind each other, webs of said rail pairs being at right angles to each other, said rails being of substantially U-formed section and turned about 180* in relation to each other, said rails defining at least one permanently closed locking cavity having solid angles of 90* at its corners, the size of said cavity being increased the more the engagement area of said rails is increased, and an expandable body of adhesive foam material in said cavity, which material, on reaching its maximum volume, presses parts of said rails at least partly into and at least partly against each other, simultaneously keeping the buidling elements tightly joined, and which foam material provides upon its expansion a tight connection between the building elements, said rails being embedded in recesses provided in said end surfaces of the respective building elements, said recesses in one building element having solid angles of 90* at their corners and being large enough to receive parts of an adjacent one of said rails of another building element, wherein one side flange of said rails is attached in said recesses, and theiR free side flanges and bottom flanges cooperate to form said cavity, said rails include parts formed integral with at least one of said outer plates and parts attached thereto, and wherein a rail of one building element is a U-shaped sectional member, from one side flange of which projects an edge flange, the latter being attached to the edge of an outer plate of the corresponding building element, so that a part of said cavity of the sectional member is laid free, whereas a rail of another building element is an L-shaped sectional member, one flange of the latter being attached to an outer corresponding plate of the other building element.
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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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |