Stock material or miscellaneous articles – Structurally defined web or sheet – Including aperture
Patent
1978-06-22
1981-06-09
Epstein, Henry F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including aperture
29521, 310216, 310217, B32B 324
Patent
active
042725798
ABSTRACT:
A die structure for use in a laminated core manufacture wherein a plurality of apertured sheets are provided with projections formed from the portion of the sheet from which the apertures are formed to define an interlocked laminated stack. The first of the sheets is provided with a through aperture with the projection being eliminated so as to define a nonprojecting surface in the first of the sheets of the stack, with the projections of each of the subsequent sheets extending into and being interlocked with the preceding sheets in the aperture thereof. The punching apparatus for providing the apertures and projections is selectively operated to define either the formed aperture and projection structure or a blanked out apertured structure. The blanked out apertured structure defines the first of the sheets of the stack. The extent of the projections from the sheets is preselected to be no greater than the thickness of the sheets so that the projection of the sheets superjacent the first lamination is received fully within the blanked out aperture thereof. The blanked out sheets may be indexed to define a skewed axis dynamoelectric structure.
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Epstein Henry F.
Mitsui Mfg. Co., Ltd.
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