Cutting – Processes – Cutting part way through from opposite sides of work
Patent
1991-11-15
1992-11-10
Watts, Douglas D.
Cutting
Processes
Cutting part way through from opposite sides of work
82 57, 83490, 83679, B26D 124
Patent
active
051614413
ABSTRACT:
A circle shear device for cutting holes and rings in sheet metal wherein a pair of spaced apart, coaxially aligned center shafts are each provided with a cutter wheel which is mounted on a radially extended arm. In operation a metal blank is inserted between the two spaced apart center shafts and the center shafts are brought together wherein the sheet metal blank is restrained from moving by the bearing mounted supporting platform members of each center shaft. Synchronous rotation of the center shafts is achieved by a jack shaft assembly which joins the two center shafts. In a preferred embodiment, a motor is provided to power the rotation of the shafts. In an alternate embodiment, the shafts may be rotated by the use of a hand crank. A pneumatic cylinder is also provided to one of the shafts to permit vertical reciprocation of the shafts for removal and insertion of metal blanks for cutting operation. In one embodiment, the circle shears may be implemented in an automatic feed system wherein sheet metal is directed onto a line from a spooling apparatus. The metal sheet is then cut into even sections via a blanking apparatus, after which each blank is passed through the circle shear station for hole cutting operation. The cut blanks may be removed from the line or advanced to another station for additional metal forming.
REFERENCES:
patent: 2325 (1841-11-01), Bulkley et al.
patent: 1519815 (1924-12-01), Vance
patent: 1545029 (1925-07-01), Bechtold
patent: 1971701 (1934-08-01), Bills
patent: 4397207 (1983-08-01), Isaac
Roper Whitney Co. Catalog M, "Manually Operated Tools" p. 27 (Circle Shears No. 298) (1984).
Dulin Jacques M.
Feix Thomas C.
Peterson Kenneth E.
Watts Douglas D.
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