Pipe joints or couplings – Flange
Patent
1986-12-08
1988-02-16
Arola, Dave W.
Pipe joints or couplings
Flange
285424, 403295, F16L 2300
Patent
active
047250836
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a flanged joint for two sheet material air channel sections of rectangular cross section.
Flanged air channel joints having flanges which are formed from hollow sheet material shapes and steel angle pieces are state of the art. A device for joining air channel elements is known from the West German patent No. 32 03 204 and, at its abutting edges, is provided with receptacles for flanged shapes which define corners. The flanges shapes are constituted by double-walled shapes of essentially L-shaped cross section made of bent sheet material. On the one hand, this enables the flanged shapes to grip the walls of the air channel elements from above and below while, on the other hand, this enables the flanged shapes to define the receiving regions for the corners. The walls of the individual regions of the shapes are spaced from, and are substantially parallel to, one another.
These known flanged joints have the drawback that, after insertion of the angle pieces in the hollow sheet material shapes, the angle pieces must be secured in the direction of insertion by grinding or spot welding. This prevents the frame-like flange consisting of four hollow sheet material shapes and four angle pieces from falling apart upon being drawn onto the air channel section.
In view of this drawback, the West German Offenlegungsschrift No. 26 27 515 proposes to produce flanges from hollow shapes and angle pieces with the angle pieces having more than two holes the centers of which are equally spaced from one another. The hollow shapes are formed in such a manner that cups having the same diameter and spacing as the holes in the angle piece are produced on the hollow shape. After the angle pieces are driven in, the cups of the hollow shapes are supposed to be received in the holes of the angle pieces. This flanged joint has been found to be unusable in practice.
The hollow shapes are cut to length in accordance with the desired size of the air channel section. The cut may pass through a cup but can also lie somewhere between two cups. If the angle pieces are now driven in, either all or none of the cups on the hollow shape catch in the holes of the angle piece. Due to the predetermined, technically attainable diameter of the cups and holes, and due also to their uniform spacing, the tolerance for the length of a hollow shape with locked cups and two driven in angle pieces is at most twice the distance between neighboring cups and neighboring holes. For a proposed distance of 1 cm--a smaller distance is virtually unobtainable technically--the length tolerance would be about 19 mm. In practice, however, at most 2 mm is acceptable.
It is not only for this reason, however, that the flanged joint of the West German Offenlegungsschrift No. 26 27 515 cannot be used in practice. If a flange of hollow sheet material shapes and angle pieces is mounted on the ends of the air channel sections without further mechanical processing or spot welding to secure the angle pieces in the hollow sheet material shapes, a large force of engagement must exist between each hollow sheet material shape and angle piece because the flange is driven onto the air channel section with a hammer. Since the force of engagement for the proposed solution with cups and holes is equal to the force required for insertion, production of a flange by driving the angle pieces into the hollow shape with a large force is too time-consuming, wastes too much force and creates too great a danger of injury for the worker.
Another flanged joint in which the angle pieces lock in the hollow shape is known from the West German Offenlegungsschrift No. 24 34 160. Here, a rectangular recess is stamped in the angle piece and a similarly rectangular tongue stamped out of the hollow shape catches therein. While the flanged frame produced in this manner cannot fall apart after the angle pieces are pushed into the hollow sheet material shapes, it is nevertheless unstable because of the required air gap between the tongue of the hollow sheet material shape and the reces
REFERENCES:
patent: 3198561 (1965-08-01), Witt
patent: 3200913 (1965-08-01), Nelson
patent: 3643989 (1972-02-01), Sattler
patent: 4304423 (1981-12-01), Mez
patent: 4461499 (1984-07-01), Hunter et al.
patent: 4537430 (1965-08-01), Sullivan
patent: 4542923 (1985-09-01), LaCrosse
Arola Dave W.
Komotzki Michael
Kontler Peter K.
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