Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1987-06-01
1988-11-08
Jones, David
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
72373, 72374, 7245316, 72456, B21D 7022
Patent
active
047826860
ABSTRACT:
A tube bending apparatus includes a substantially vertical structure with a bending shoe reciprocally mounted in a vertical plane. The ends of such shoe ride in parallel vertical guide channels, while the center of the bending shoe is powered preferably by a single controllable pressing mechanism such as a hydraulic cylinder. Respective capture members are positioned at the top of each guide channel for capturing an initially substantially straight tube therein for bending. During a bending operation, the pressing mechanism raises the bending shoe upward in opposition to the capture members so that the tube is bent between such elements. Return springs may be provided symmetrically positioned on each side of the pressing mechanism for lowering the bending shoe subsequent to a bending operation. Preferably, the bending apparatus progressively forms an approximate 60.degree. bend in a tube of up to 15/8 inch diameter so that the resulting tube is bent without crimping. The resulting tube is particularly suited for joining abutting apex roof portions and roof-sidewall portions defining structural support for a utility building, especially such as a greenhouse.
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