Flexible pipe connecting unit

Details Flexible pipe connecting unit Flexible pipe connecting unit

2005-09-20

2005-09-20

Dunwoody, Aaron (Department: 3679)

Pipe joints or couplings

Flexible joint, rigid members

Bellows

C285S226000

Reexamination Certificate

active

06945567

ABSTRACT:
The invention is directed to a flexible pipe connecting unit which includes a part made of elastic workable material. The pipe connecting unit includes a wave-shaped or hose-shaped bellows (4) made of elastomeric material. The bellows (4) has respective projecting flange collars (14; 14a, 14b) at its respective ends. The flange collars (14; 14a, 14b) preferably are provided with a reinforcement insert (16; 16a, 16b) and annularly-shaped pipe connecting pieces (flanges18; 18a, 16b) are disposed behind corresponding ones of the flange collars. The pipe connecting unit (2) coacts directly with weld-on flanges as counter flanges (20; 20a, 20b) without additional seals or corresponding joining locations. For this purpose, the end sealing faces of the flange collars (14; 14a, 14b) are partitioned in the radial direction by a peripherally extending slot (28; 28a, 28b). In this way, at least two coaxial concentric annularly-shaped sealing surfaces (14-I,14-II) are formed. With outer weld-on or slip-on flanges (20; 20a, 20b), only corresponding ones of the outer annular sealing Surfaces (14-I) are in contact engagement and, when the counter flange (20; 20a, 20b) is a welding-neck flange, at least the outer sealing annular surface (14-I) comes into contact engagement. A stabilization ring (32) can be implanted in the slot (28; 28a, 28b) of the flange collar (14; 14a, 14b) between the outer annular sealing surface (14-I) and the inner annular sealing surface (14-II).

REFERENCES:
patent: 3666296 (1972-05-01), Fischetti
patent: 4293152 (1981-10-01), Berghofer
patent: 4765660 (1988-08-01), Maier
patent: 5174613 (1992-12-01), Joug
patent: 5273321 (1993-12-01), Richter
patent: 6076864 (2000-06-01), Levivier et al.
patent: 3923344 (1990-02-01), None

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