Year: 1890

page_text: Date of Application, 12th Dec.. 1890-Accepted, 17th Jan., 1891
Figure 1 is a front elevation of the improved machine.
Figure 2 is a plan thereof.
Figure 3 is a side view thereof and
Figure 4 is a cross-section taken on the line 1-1 of Figure 1.
The two side-frames R R support a feed-screw (and a core-spindle E and are
united by guide-bars B B¹.
The threads of the feed screw Care broken up so as to form a series of short
screws which are connected by screw-threads d of less pitch than that of the
screws c.
Upon the feed screw C is mounted a slide A which is prevented from turning by
the guide-bars B B₁ passing also through the slide A and this slide A is caused to
follow throughout its traverse the varied pitch of the screw-threads c d by means of a
screw G screwing through the slide A and the point of which enters between the
threads of the feed screw C or any other suitable projection might be employed for
this purpose.
Upon the ends of the feed-screw (and the core-spindle E are fixed two spur-
wheels D D whi h transmit the rotation of the former to the latter, which is
situated a little higher than the feed screw C.
In the slide A are formed two small holes F F' upon the same plane as the core-
spindle E and the core-spindle E is supported in a bearing formed by a box or
bracket A fastened to the slide A and which may be changed according to the
diameter of the spindle E.
One end of the metallic wire of which the spring is to be made is passed through
one of the holes F F and through a transverse hole e of the core-spindle E and the
feed-screw and consequently the spindle E are then rotated whereby the wire is
wound upon the core-spindle E in threads, the pitch of which corresponds exactly
with that of the threads of the feed-screw C and I thus produce a spring with varied
pitch.
By replacing the feed-screw by another one with differently cut screw-threads
according to the result desired a variety of different springs may be produced.
The pitch of the spring to be produced can also be varied in relation to the pitch of
the screw-threads of the feed-screw C by employing spur wheels of different diameters
in place of those D D¹ of equal diameter.
I would have it understood that the wire and also the core-spindle E may be of
various cross sections such for example as round, square, or oval for producing springs
of different forms.
Instead of constituting the feed-screw C the driving-shaft it may be the driven one
and the core-spindle E the driving-shaft.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what 1
claim is :-
1. In a machine for making spiral springs a feed-screw C formed with threads of
..

page_text: varied pitch, a slide A provided with a screw G or other projection which engages the
feed-screw so that the slide A is traversed thereby and a core-spindle E receiving
motion from the feed-screw C the several parts being so arranged that a length of
wire thrust through and guided by the slide A will be wound upon the core-spindle E
in screw coils with varied pitch corresponding with that of the feed-screw C, sub-
stantially as herein shown and described.
2. In a machine of the character set forth in claim 1, a guide-box A¹ adapted to
receive the core-spindle E and fastened to the slide A for the purpose explained.
3. In a machine of the character set forth in claim 1, transmitting the rotation of
the feed-screw C to the core-spindle E or vice versa by spur wheels D D¹ of the same
diameter or of different diameters for the purpose explained.
Dated this 12th day of Decepihar 1800
WHITE & WOODINGTON,
27, Southampton Buildings, London, Agents,