Method of making coils

Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator

Patent

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Details

291573A, 291573AH, 291573B, 29727, 165 65, 165172, B21D 5300, B23P 1526, F28F 110

Patent

active

046190244

ABSTRACT:
A slit fin heat exchanger is formed by wrapping slit fin tubing into a flat coil having two spaced rows of tubing. The flat coil is located on mandrels which are rotatable about spaced parallel axes with the mandrels and axes initially being in the same plane. A piece of expanded metal is placed between the two rows. The mandrels are rotated about their axes in opposite directions which shifts the plane in which the coil is located. The shifting of the plane of the coil moves a portion of a first row of the coil into contact with a planar portion of a platen and the second row of the coil into a nesting relationship with the portion of the first row which is in contact with the planar portion of the platen and the piece of expanded metal. Continued rotation of the mandrels causes folding of the portions of the coil which extends the area of nesting. The folding takes place through up to 120.degree. and the ends of the first row of the coil contacts a portion of the platen causing the formation of a knob at the end of each coil. The piece of expanded metal serves to support the coil such that tube supports are not necessary.

REFERENCES:
patent: 3820215 (1974-06-01), Pasternak
patent: 4298062 (1981-11-01), Pasternak
patent: 4438808 (1984-03-01), Venables et al.

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