Gripping head of an hydraulic sheet stretcher

Details Gripping head of an hydraulic sheet stretcher Gripping head of an hydraulic sheet stretcher

1982-03-22

1985-02-05

Crane, Daniel C.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

By individually non-deforming clamps

72301, B21D 2504

Patent

active

044971931

ABSTRACT:
A gripping head (1) comprises a plurality of vertical, spaced laminae (3) defining a gripping aperture (4) for gripping a sheet (7) to be stretched. The laminae (3) are welded at one edge to flanges of a horizontal cross member. In order to facilitate the welding, and to reduce the stress concentration factor at the weld, fillers (11) are arranged between the laminae at the said edge and the weld is a butt weld (13). After welding, the ends of the fillers (11) at the weld seam (13) are bored out (18) to remove cracks, or gaps (16, 17) between the fillers (11) and the laminae (3).

REFERENCES:
patent: 2727556 (1955-12-01), Albers
patent: 2908316 (1959-10-01), Albers
patent: 3082809 (1963-03-01), Petsch et al.
patent: 3575031 (1971-04-01), Gray

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