Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1978-06-22
1980-01-08
Husar, Francis S.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
291573C, 113118C, 165151, B23P 1526
Patent
active
041820134
ABSTRACT:
A solar collector panel consists of a metal sheet and a number of straight metal tubes intimately connected to the sheet in order to obtain maximum thermal conductivity. One tube each is connected to a sheet by slotting the latter along a straight line by equidistant parallel short cuts and pressing the areas between two consecutive cuts into semi-cylindrical bulges alternately in opposite direction from the sheet surface. These bulges have a concave semi-circular cross section of a diameter slightly larger than the outer diameter of the tube, and all bulges along the straight line form a continuous passage into which the tube is inserted. After insertion the tube is expanded by mechanical means or by hydraulic pressure and pressed onto the semi-cylindrical portions of the sheet, satisfactory contact being obtained by dimensioning the expanding pressure to a magnitude that the tube material is stressed beyond its yield point, while the sheet metal is stressed below its elastic limit. A suitable number of tubes is, in this manner, connected to a single sheet, and their ends are subsequently connected to form the required water circuit.
REFERENCES:
patent: 1903125 (1933-03-01), Modine
patent: 2688794 (1954-09-01), Malutich
Husar Francis S.
Koch Robert J.
Rising V. K.
Technion Research & Development Foundation Ltd.
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