Pipe joints or couplings – Packed – Flanged pipe
Patent
1988-02-02
1989-06-06
Arola, Dave W.
Pipe joints or couplings
Packed
Flanged pipe
285379, 285424, 285906, F16L 1700
Patent
active
048365858
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a shaped flange for connecting air duct segments.
In the production of ventilating and air conditioning ducts, air duct segments are connected to one another via shaped flanges. The shaped flanges are cut to size and connected to each other by means of corner angles. The shaped flanges are then drawn onto the air duct segments. The two portions of each shaped flange which are perpendicular to the front wall of the respective flange receive, that is, overlie and underlie, the associated wall of the air duct segment.
Among other criteria, it is important to assure that a seal exists between the sheet material wall of the air duct segment and the portion of the shaped flange which underlies this wall.
The West German Pat. No. 32 03 204 describes an arrangement of the type under consideration for connecting air duct elements which, at their abutting edges, are provided with shaped flanges defining receiving spaces for angled corner members. Here, it has been attempted to solve the sealing problem by providing a sealing ledge in that wall zone of the shaped flange which, during use, is parallel to the plane of, and faces away from, the seam. The desired sealing effect can, however, be obtained only if the sealing ledge bears against the front wall of the shaped flange in an airtight manner. This is impossible on production grounds.
The West German Offenlegungsschrift No. 23 53 625, which describes a butt joint different from the type under consideration for duct sections of sheet material, discloses a shaped flange which is placed on the edge of the respective duct side wall and secured by spot welds. The duct side walls are thus not inserted in corresponding receiving spaces of the shaped flange.
The legs of the shaped flange extending perpendicular to the duct walls are provided with sealing strips which are clamped by rolling. The sealing effect in this construction accordingly depends upon the installation of the duct segments and upon the clamping force of the clamping element which holds the shaped flanges together. Furthermore, the seal can be cut by the free front edges of the duct segments during assembly of the duct segments. In practice, precision installation of the duct segments is as good as impossible since tolerances of more than 5 mm are the rule.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a shaped flange for connecting air duct segments which assures that the portion underlying the sheet material of the air duct segment forms an airtight seal with the wall of the air duct segment regardless of whether the front edges of the air duct segments lie in a common plane. Moreover, the seal is to be formed automatically upon application of the shaped flanges to the air duct segments.
This object of the invention is achieved by providing the flange portion located underneath the wall with a receiving space formed by shaping of the flange portion and having a seal of elastomeric material worked into the same. The free upper edge of the seal projects beyond the plane of the inner surface of the flange portion.
If, for example, the free end of that portion of the shaped flange which is to underlie the walls of the air duct segments is bent 180.degree., then a seal of elastic material can already be rolled into the thus-formed pocket during rolling of the shaped flanges.
During the rolling operation, the pocket with the seal may be inclined in such a manner that the upper edge of the pocket lies in the same plane as the inner surface of the flange portion which is to underlie the wall of the air duct segment. If the beginning of the seal, as seen in the direction of insertion of the wall of the air duct segment, is at a lower level than the upper edge of the pocket, the wall of the air duct segment can then be pushed between the overlying and underlying portions of the shaped flange with no problem and without damaging the seal of elastomeric material. Upon connecting the overlying and underlying portions of the shaped flang
REFERENCES:
patent: 2314386 (1943-03-01), Brend
patent: 3955834 (1976-05-01), Ahlrot
patent: 4216981 (1980-08-01), Jensen
Arola Dave W.
Kontler Peter K.
LandOfFree
Shaped flange for connecting air duct segments does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Shaped flange for connecting air duct segments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shaped flange for connecting air duct segments will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-35371