US3923326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flange connection
Assignee: Individual
•
Filing: 1974-02-04
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Granted: 1975-12-02
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Expires: 1994-02-04
Abstract
Abstract A flange connection for rectangular air-conditioning ducts has four hollow open-ended frame members which fit rigidly on the ends of the duct walls. The legs of separate elbows fit into the openings. Spacers are provided at the corners of the elbows on offset plates. The spacers cause the sealing surfaces of opposite frame members to be pushed towards a sealing plane when nut and bolt fastening means press opposed elbows towards each other.
Inventors
- 👤 Georg Mez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:01
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/12; F16L23/14; F16L23/02; F16L23/032; F24; F24F; F24F13/00; F24F13/02; F24F13/0209
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
198 words
A flange connection for rectangular air-conditioning ducts comprising flange means having four sheet metal frame members, said frame members having open hollow sections at the ends of said frame members and sealing surfaces between said open ends adapted to seal against their surface at a sealing plane, said flange means being adapted to be pushed on the free end of a duct and to be rigidly connected therewith, metal elbow means several millimeters in width having two legs and a central portion, with a corner area thereon, connected to said legs, said legs being inserted into the open hollow sections on adjacent ends of said frame members, said elbow means having spacer means in one piece therewith projecting from the corner area thereof in the direction of said sealing plane, of a material suitable to maintain an adequate effective height when subjected to contact pressures on said elbow means, thE projecting height of said spacer means being adequate to space the corner of said elbow means from the sealing plane to cause the sealing surfaces on the frame members to press towards the sealing plane and maintain them in this position, under contact pressure on said elbow means.
Claim 2
Dependent Claim
198 words
A flange connection for rectangular air-conditioning ducts comprising flange means having four sheet metal frame members, said frame members having open hollow sections at the ends of said frame members and sealing surfaces between said open ends adapted to seal against their surface at a sealing plane, said flange means being adapted to be pushed on the free end of a duct and to be rigidly connected therewith, metal elbow means several millimeters in width having two legs and a central portion, with a corner area thereon, connected to said legs, said legs being inserted into the open hollow sections on adjacent ends of said frame members, said elbow means having spacer means in one piece therewith projecting from the corner area thereof in the direction of said sealing plane, of a material suitable to maintain an adequate effective height when subjected to contact pressures on said elbow means, thE projecting height of said spacer means being adequate to space the corner of said elbow means from the sealing plane to cause the sealing surfaces on the frame members to press towards the sealing plane and maintain them in this position, under contact pressure on said elbow means.
Claim 3
Dependent Claim
18 words
A flange connection pursuant to claim 1 in which said spacer has an effective height of several millimeters.
Claim 4
Dependent Claim
27 words
A flange connection pursuant to claim 1 in which said spacer means comprises at least one nose means embossed from the corner area of an elbow means.
Claim 5
Dependent Claim
27 words
A flange connection pursuant to claim 3 in which said spacer means comprises a single nose which is located in the angle bisector of an elbow means.
Claim 6
Dependent Claim
19 words
A flange connection pursuant to claim 3 in which each nose means of each elbow means has identical height.
Claim 7
Dependent Claim
23 words
A flange connection pursuant to claim 3 in which said nose means are positioned to abut when the elbow means face each other.
Claim 8
Dependent Claim
36 words
A flange connection pursuant to claim 3 in which said nose means have such a position that the nose means abut on non-embossed areas of the other elbow means when the elbow means face each other.
Claim 9
Dependent Claim
47 words
A flange connection pursuant to claim 1 comprising bolt and nut means for fastening elbow means in faced relation to each other, in which said spacer means is located in an area essentially outside of the area which is directly below the bolt head or the nut.
Claim 10
Dependent Claim
27 words
A flange connection pursuant to claim 8 in which said spacer means is located in the extreme corner area of said central portion outside of said area.
Claim 11
Dependent Claim
58 words
A flange connection pursuant to claim 1 in which at least a portion of said central portion with its corner area has been embossed from that plane which is defined by the legs and the remainder of the central portion and the tip of the corner area is embossed from said central portion and forms said contact surface.
Claim 12
Dependent Claim
22 words
A flange connection pursuant to claim 1 in which said elbow means is seated practically free from play in the hollow section.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |