Metal deforming – By use of non-deforming work-gripping clamp and relatively... – With plural spaced clamps
Patent
1990-05-10
1991-11-05
Larson, Lowell A.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
With plural spaced clamps
723796, B21D 1120
Patent
active
050622862
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and apparatus for bending corrugated sheet transversely of the corrugations. The invention is intended preferably for application in the building construction field for roofing purposes and in the construction of industrial buildings and storage locations, tool sheds, etc., in such cases as those where the walls of said building structures are also covered with corrugated sheet. The inventive method can also be used advantageously in other fields, for instance in the provision of corrugated sheet surrounds for loading pallets.
BACKGROUND PRIOR ART
Since corrugated sheet cannot be bent transversely of its corrugations without great difficulty, it is endeavoured to avoid such constructions, by placing joints at angled locations, where the sheets are placed at an angle to one another, and then covering the joints with an angled strip bent from flat sheet. Alternatively, one sheet can be allowed to project over the joint location, when possible. Consequently, there is a need to be able to bend corrugated sheet easily, for instance so that corrugated sheet can be placed over an arris or roof ridge, thereby eliminating the need for separate ridge plates. When constructing sheds or similar, simple storage facilities, an advantage would be gained if one and the same corrugated sheet could be extended from the roof of a building down onto a side wall thereof.
SUMMARY OF THE INVENTION
The object of the invention is to satisfy these requirements, by providing a method and apparatus which will enable the sheet bending process to be divided into two stages, of which only the first stage requires access to an edging press or like tool and the second and last stage can be effected with the aid of simple means. The corrugated sheet is provided in the first stage with one or more fold lines or weakenings along which the sheet can be bent to desired angles in the second sheet bending stage, with the aid of very simple means. The method enables sheet provided with prescribed fold lines or weakenings thereon to be delivered from the factory to the working site, for instance a building structure as before indicated, where the last stage of the sheet bending process can be carried out with the aid of simple means. At the same time, the tool may be given such simple construction as to enable it to be handled by unskilled workmen, without supervision.
BRIEF DETAILED DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the accompanying drawing, in which FIG. 1 illustrates in side view one exemplifying embodiment of the invention and
FIG. 2 illustrates the same embodiment in plan view.
DESCRIPTION OF AN EXEMPLIFYING EMBODIMENT
In accordance with the method, which is described herebelow with reference to the accompanying drawings, corrugated sheet 4 is placed in an edging or folding press on a flat die 6, where it is held in place by a tongued pressfoot 2 which is constructed so as to enable it to be brought into pressing engagement with the bottoms of respective sheet corrugations. The tongues of the pressfoot extend across both sides of the sheet location at which a fold line or weakening is to be formed, said fold line or weakening being produced with the aid of a pressbar 1 which has a rounded edge and which is moved towards the die under great force, by means of hydraulic pistons 8 or by suitable equivalent means. As seen in FIGS. 1 and 2 the bar is a flat member which has a lower rectilinear edge extending across all the corrugations. The fold line or weakening takes the form of an a v-shaped indent 7 in the crests of the corrugations in the sheet 4. The depth of the indent 7 can be varied and therewith adapted to the angle to which the sheet is to be bent, by adjusting the length of stroke of the pressbar 1. Since the requisite indent depth for right angle bends will take up only a part of the height of a corrugation, there remains sufficient space in the corrugation valleys to accommodate the pressfoot 2 during the entire pres
REFERENCES:
patent: 2638958 (1953-05-01), Norquist et al.
patent: 2980046 (1961-04-01), McGregor et al.
patent: 4380573 (1983-04-01), Naslund
Beco Produktutveckling
Larson Lowell A.
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