Stock material or miscellaneous articles – All metal or with adjacent metals – Nonplanar – uniform-thickness material having symmetrical...
Patent
1976-01-21
1978-08-15
Steiner, Arthur J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Nonplanar, uniform-thickness material having symmetrical...
291573R, 113 1R, 113 1C, 165173, 428597, F28F 112
Patent
active
041073940
ABSTRACT:
In a corrugated metal sheet of the type that is adapted to have the edges of recesses which are located at the crests of the corrugations engaging a tube for establishing heat transmitting contact between the metal sheet and the tube, each recess in the metal sheet is so much smaller than the geometrical figure inscribed by the line of engagement between the metal sheet and the tube that an annular edge portion will be formed between the recess and the line of engagement. As a result, the recess despite manufacturing inaccuracies will bear with the whole extent of its edges against the tube, the excess material at the edges of the recess being brought to form an edge flange facing the tube.
The corrugated metal sheet is manufactured from a strip which is advanced stepwise in the corrugating operation. The recesses are punched in the metal sheet before the corrugating operation, the punching being effected between the steps of advancing the metal sheet. The corrugations are also given their final shape between the steps of advancing the metal sheet. Between the steps of advancing the metal sheet, the excess material at the edges of the recess in a finished corrugation is shaped into the edge flange which is to engage the tube.
REFERENCES:
patent: 2977918 (1961-04-01), Kritzer
patent: 3490524 (1968-01-01), Pasternak
patent: 3922768 (1975-12-01), Takayasu
Flocks Karl W.
Sensotherm AB
Steiner Arthur J.
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