Metal deforming – By use of non-deforming work-gripping clamp and relatively... – With cutting
Patent
1991-05-01
1993-03-16
Crane, Daniel C.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
With cutting
72307, 72217, 72 26, 72 3, 72426, B21D 7022
Patent
active
051933780
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an apparatus for bending rod-shaped material to form bent concrete-reinforcement elements, such as stirrups, having a frame for supporting a material feed device and having a bearer for bending members, which bearer is mounted on the frame so as to be rotatable about the axis of feed and is adjustable relative to the frame.
BACKGROUND
In an apparatus of this type, known from U.S. Pat. No. 4,782,684, Benton, the bearer for the bending members has a driven rotatable disc which is mounted on the frame so as to be rotatable in both directions about the axis of feed and is provided with a passage aperture for the rod-shaped material. Extending from the rotatable disc is an arm, which is provided with a slide guide which is penetrated by the material and is aligned with the rotatable disc aperture. At its free end, the bearer bears a bending head which is fitted with bending mandrels which can be rotated or swivelled about an axis perpendicular to the guide. The known design primarily has the disadvantage that bars with relatively large limb lengths cannot be effectively supported by the bearer arm and are at risk of becoming deformed under their own weight. On the other hand, due to the lack of adequate support, no possibility is provided of counteracting or compensating for a spring-back tendency of the material during bending. Finally, in the known construction, a cutting-off device for the bent element is provided on a separate frame away from the bending head, which cutting-off device is complicated in construction and susceptible to malfunction.
THE INVENTION
The object of the invention consists in avoiding the disadvantages described and providing an apparatus of the type specified in the introduction which allows rod-shaped material to be bent satisfactorily in different bending planes and with any desired limb lengths and allows the resulting bent elements or stirrups to be cut off in a simple manner. At the same time, the invention is intended to allow the continuous bending of spatial reinforcements and so-called stirrup cages or binders.
Briefly, the apparatus according to a feature of the invention has a bearer which is constructed as a material supporting table. The table is adjustable in a predetermined angular position relative to the frame. A cutting device is provided on the table upstream of the bending members in the material feed direction for cutting off the rod-shaped material from a line of material after the bending operation. The table is rotatably supported from the frame by a tubular element, placed coaxially with the axis of feed of rod-shaped material to permit angular rotation of the material supporting table. The table surface is at least as large as the surface enclosed by the contour of the reinforcement stirrup.
The invention advantageously provides an adjustable supporting surface for the bent reinforcement elements or stirrups which guarantees satisfactory forming of the elements without the risk of deformation, it being possible for the elements to be cut off reliably without great constructional expenditure and without delay.
In accordance with a feature of the invention, an electrical connection strip is provided on the supporting table with clearance from the bending members for providing electrical contact with the bent material, via which strip the rotational movement of the table can be controlled. By this means, in the case of the bent element being unintentionally lifted up from the supporting table, readjustment of the supporting table into renewed contact with the element is achieved.
According to a further feature of the invention, a receiver is provided below the supporting table for reinforcement elements or stirrups dropping downwards when the supporting table is in the horizontal position, the receiver preferably being rotatable.
DRAWINGS
The invention is described in greater detail below by way of an exemplary embodiment with reference to the drawings, in which:
FIG. 1 shows a diagrammatic perspective
REFERENCES:
patent: 3052277 (1962-09-01), Stegmann
patent: 3373587 (1968-03-01), Shubin
patent: 3395846 (1968-08-01), Mille
patent: 3440847 (1969-04-01), Giordano
patent: 3493016 (1970-02-01), Ott
patent: 4782684 (1988-11-01), Benton
patent: 5009097 (1991-04-01), Del Fabro
Ritter Gerhard
Ritter Klaus
Schmidt Gerhard
Crane Daniel C.
EVG Entwicklungs-u Verwertungs-Gesellschaft m.b.h
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