Metal deforming – By deflecting successively-presented portions of work during... – To form spiral coil
Patent
1994-03-11
1996-03-05
Larson, Lowell A.
Metal deforming
By deflecting successively-presented portions of work during...
To form spiral coil
72147, 72148, B21C 4700
Patent
active
054957397
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for forming scrolls from strip material. Such scrolls are utilised for example in decorative iron work for gates, fences, windows, ornaments and the like.
Scrolls are typically formed from metal strip or bar which is initially straight, but which is inserted into a jig and coiled resulting in the formation of the scroll. If a scroll is to turn through only a single revolution, or 360.degree., then the design and construction of the jig is quite simple, but if, as is more usual, the scroll is to turn through more than one revolution, and a scroll in the order of two revolutions is perhaps the most common, then the design and construction of the jig is much more difficult. This occurs because the part of the scroll which enables the formation of the second revolution prevents the strip from being inserted into the part of the scroll which forms the first revolution. In consequence, scroll jigs for forming scrolls of more than one revolution have had to be specially adapted and various forms are now in use.
In a first form, the scroll is in two parts for forming the respective revolutions, and the second part is detachable from a support plate which holds the first part. The first revolution of the scroll is formed on the first part with the second part removed, and following formation of the first revolution of the scroll, the second part of the scroll jig is put in place, and the scroll forming continues.
In another construction, the scroll jig is again in two parts, being a fixed part to form the first revolution of the scroll, and a second part which is hinged to the first part and can be hinged out of the way whilst the first revolution of the scroll is being formed. The second part of the jig swings into position after completion of the first revolution of the scroll, and then is utilised for the formation of the remainder of the scroll.
In yet a further arrangement, the scroll jig has the inner part of the scroll jig which forms the first revolution of the scroll higher than the remainder, and the jig has an edge which gradually tapers from the higher part to the lower part so that the metal strip as it is being formed into a scroll, progressively runs down the support edge whereby a scroll of more than one revolution can be formed on a single jig. The scroll so formed however as well as defining a spiral also takes up a slightly conical form, and it must be flattened in order to complete the scrolling operation. It is not suitable for scrolling relatively heavy gauge material.
The present invention seeks to provide another form of scroll forming apparatus which is particularly convenient in use in that it does not require scroll jig parts to be detached or to be pivotally interconnected and yet enables the formation of multiple turn scrolls which do not require subsequent flattening but wherein the scrolls can be formed in a continuous operation.
In accordance with the invention in one aspect thereof, scroll forming apparatus comprises a scroll forming jig comprising at least a first part and a second part, said first part enabling a formation of a first revolution of the scroll, and the second part enabling a formation of a second revolution of the scroll, said first and second parts being axially displaced relative to the axis of rotation as the first revolution of the scroll is formed, and being such that upon completion of at least a part of said first revolution, either the partly formed scroll is moved axially relative to the second part of the jig, or the second part of the jig is moved axially relative to the scroll whereby at least a part of the second revolution of the scroll can be formed on said second part of the jig and in the same plane as the first revolution of the scroll.
The said scroll jig may comprise an inner scroll part and an outer scroll part which are connected at a shoulder or step, or preferably, the scroll jig is in two parts which are relatively axially displaceable on the axis about which the strip is rotated in forming the scroll.
REFERENCES:
patent: 805231 (1905-11-01), Pembroke
patent: 2406130 (1946-08-01), Boyce
patent: 2479391 (1949-08-01), Miller
patent: 3020949 (1962-02-01), Garcia
patent: 3420080 (1969-01-01), Supina et al.
patent: 3538736 (1970-11-01), Nyren
patent: 3580018 (1971-05-01), Gott
patent: 4351175 (1982-09-01), Ichikawa et al.
Butler Rodney A.
Larson Lowell A.
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