Improvements in the Manufacture of Flat Wire Springs.
Year: 1891

page_text: Date of Application, 15th Sept., 1891
Complete Specification Left, 26th May, 1892-Accepted, 2nd July, 1892
PROVISIONAL SPECIFICATION..
Improvements in the Manufacture of Flat Wire Springs.
I, HERMANN HEINRICH WAGENER of Untere Carlstrasse 4 in Cassel in the
Empire of Germany, Manufacturer, do hereby declare the nature of this invention
to be as follows:-
The object of this invention is to improve the method of manufacture of flat wire
springs or springs made of wire bent to a peculiar shape to form springs such as
have been formerly used in the place of whale bones.
According to the improved method of manufacture the wire of suitable size is
wound spirally upon a cylindrical mandrel and over this layer of spiral wire is
wound a second layer of the same pitch of spiral but contrary in direction. The
points at which the second layer will cross the first are thus found on two parallel
lines diametrically opposite to one another on each side of the axis of the spiral
and parallel to the axis. The mandrel is then withdrawn and the double coil of
wire is flattened either so as to bring the said two lines of contact points together
one on the other down the centre of the flat spring band so produced, or else so
that the said points are along the two edges of the band.
Dated this 15th day of September 1891.
HERBERT & Co.,
Agents to Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Flat Wire Springs.
I HERMANN HEINRICH WAGENER of Untere Carlstrasse 4 in Cassel in the
Empire of Germany, Manufacturer do hereby declare the nature of this invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
The object of this invention is to improve the method of manufacture of flat wire
springs, or springs made of wire bent to a peculiar shape to form springs such as
have been formerly used in the place of whalebones.
According to the improved method of manufacture the wire of suitable size is
wound spirally upon a cylindrical mandril and over this layer of spiral wire is
wound a second layer of the same pitch of spiral but contrary in direction. The
points at which the second layer will cross the first are thus found on two parallel
lines diametrically opposite to one another on each side of the axis of the spiral and
parallel to the axis. The mandril is then withdrawn and the double coil of wire is
Hattened either so as to bring the said two lines of contact points together one on
the other down the centre of the flat spring band so produced, or else so that the
said points are along the two edges of the band.
The annexed drawing illustrates the method employed. Fig. 1 shows the two
wires wound one over the other on the mandril which is afterwards withdrawn.
These springs may be pressed flat by rolling, which is the preferable method see
Fig. 6. The rolling may be applied from the direction bb or à a Fig. 2 according
as the crossings of the wire are to be down the centre as in Fig. 3 or along the
edges as in Fig. 4. The general aspect of such a spring is shown in Fig. 5.
It is not necessary to wind both wires on the same mandril, one may be wound
on one mandril, and the other on another. If the one is smaller in diameter than
the other, the smaller coil may be afterwards pushed into the larger at the end.
The two coils might also, when separately made, be pushed sideways one into the
D

page_text: other so that the coils are interleaved. Having pushed them together they may
then be rolled, and the result in any case is substantially indistinguishable from
that given by the first method herein described.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
The method of manufacturing flat wire springs consisting in coiling two wires
spirally upon a mandril in opposite directions or separately upon two mandrils
afterwards inserting the one coil in the other from the end or the side, whereby two
concentric or substantially concentric coils are produced which are afterwards
pressed flat and thus locked together to form a flat spring.
Dated this 26th day of May 1892.
HERBERT & Co.
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.