Bending table

Details Bending table Bending table

1998-12-29

2001-04-03

Davis, Robert (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

C425S392000, C425S403000

Reexamination Certificate

active

06210140

ABSTRACT:

THIS INVENTION concerns a bending table upon which lengths of plastics material rendered flexible by heating, may be set to determine a desired curvature thereof and applies particularly to a table for bending UPVC sections to form a decorative arch for window and door frames.
Lengths of uPVC section are rendered flexible by heating the profile to approximately 140° C. in an oven. It can then be shaped as desired and allowed to cool down to room temperature whereupon the section will retain the required shape.
Conventionally, this process is carried out on a table containing a number of angularly spaced straight slots extending radially from a central position, and a similar number of movable bobbins which are adjustable in position along the slots thus to provide a bearing surface to determine the required shape for the section. Usually, a flexible former strip is first placed around the pre-positioned bobbins and then the heated section is bent around the former and clamped in position until cool. Unfortunately, the provision of a slotted surface in the table tends to mark the underside of the softened section and so to overcome this problem it has been necessary to provide a pre-shaped arcuate flat strip of hardboard or the like which is placed over the slots around the bobbins and upon which the section rests while cooling. This necessitates the provision of a large number of such strips to necessitates the provision of a large number of such strips to accommodate every shape and curvature to be formed.
In an alternative known arrangement as described and illustrated in German patent specification DE 3322572, a plain table top is provided with a number of alternative and selectable adaptor platforms each having a plurality of slotted guides extendible radially outwards from the adaptor and arranged to engage a slotted former around which the desired section may be bent.
While this design avoids the marking caused by a slotted table surface, nevertheless the shape and/or radius of the section to be formed is restricted by the minimally adjustable assembly of the adaptors and guides.
There is often a requirement to produce an arched uPVC section profile which is irregular in shape and does not follow the arc of a circle. The arrangement of slots in a slotted table or the arrangement of guides on the adaptor of a plain table does not readily permit the formation of an arched section where the curvature varies throughout its length. Therefore to accommodate a wide range of curvatures and sizes conventional tables presently available are extremely limited in scope and thus largely unsuitable.
According to the present invention there is provided a bending table comprising a table top, and a plurality of arms extending radially across the table top from a supporting member fixed with respect to the table top, at least some of said arms being adjustable in length or interchangeable, each arm having a bearing surface at its free end against which a flexible elongate work piece may be located; characterised in that the angle subtended by the or at least one pair of adjacent arms is adjustable.
According to a further aspect of the invention there is provided a bending table comprising a table top, and a plurality of arms extending across the table top from a supporting member fixed with respect to the table top, at least some of said arms being adjustable in length or interchangeable, each arm having a bearing member at its free end against which a flexible elongate work piece may be located; characterised in that the bearing members and the table surface are mutually magnetically attractive.


REFERENCES:
patent: 3530540 (1970-09-01), Mueller
patent: 4695032 (1987-09-01), Desport
patent: 4731144 (1988-03-01), Kommineni et al.
patent: 3322572 (1984-12-01), None

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