Metal working – Expanded metal making – By use of reciprocating perforator
Patent
1974-12-17
1976-10-26
Gilden, Leon
Metal working
Expanded metal making
By use of reciprocating perforator
83578, 83615, B21D 3102, B26D 514
Patent
active
039875210
ABSTRACT:
Apparatus for manufacturing expanded sheet stock is disclosed. The apparatus includes a stationary knife having a cutting edge defining one edge of a strip feed slot. While the strip is fed through the slot, a movable knife passes across the slot to form half-diamond-shaped openings in the strip with each stroke. The movable knife has a cutting edge which is defined by a plurality of adjacent obelisk teeth and those teeth form the half-diamond openings during each stroke. The movable cutting knife is driven relative to the stationary knife in planar alignment therewith and in simple harmonic motion while the strip is fed through the slot so that any point on the cutting edge of an obelisk tooth sequentially shears the strip in a recurring sequence to provide half-tooth spacing between successive cuts. Such spacing results in a characteristic diamond-shaped opening in the expanded metal. According to a preferred aspect of this invention, four feed slots are provided and two movable knives have parallel cutting edges which respectively serve adjacent feed slots. The knives are driven in opposite directions to minimize machine vibration, and the knife driving mechanisms are also driven in opposite directions. According to a further aspect of this invention, the strip feed mechanism operates continuously and the strip is intermittently stopped by the shearing action of the movable knife. According to another aspect of this invention, a clamp holds the strip against the stationary cutting knife during the shearing operation.
REFERENCES:
patent: 1452224 (1923-04-01), Smith
patent: 2751984 (1956-06-01), Kuhl
patent: 3268974 (1966-08-01), Felsenthal
Gilden Leon
Gould Inc.
Sachs Edward E.
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