Improvements in the Mode of Manufacturing Spiral Springs, and in the Machinery therefor.
Year: 1892

page_text: Date of Application, 17th June, 1892
Complete Specification Left, 17th Mar., 1893-Accepted, 13th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in the Mode of Manufacturing Spiral Springs, and in
the Machinery therefor.
I, NORMAN BENNET ROBERTS, of The Knowle, Sheffield in the County of
York, Works Manager do hereby declare the nature of my invention to be as
follows:-
This invention relates to improvements in machinery for, and the mode of manu-
facturing spiral springs, from any section of steel, by which the ends of the springs
are finished in a true and perfect manner, and more expeditiously than by the
present process of manufacture.
The bars from which the springs are to be made, are sheared off to length square
at the ends, and are coiled up upon a screwed mandril the entire length of the bar,
instead of leaving each end to be tapered by hand or otherwise as is usual, which
involves several times reheating the steel.
I then take the hot coil and submit both ends either separately or at the same
time to the action of a cutter or saw, or duplicates of same working at right angles
to the centre line of the spring, in case both ends are to be operated upon at the
same time, the saws or cutters are fixed upon their spindle or spindles at the
required distance apart and the spring is passed between them, the result being that
both ends are cut off square.
I then before the springs are cool, harden and temper them in the usual way,
afterwards grinding off any fraze or fash which may have been made by the cutters,
the springs are brought into contact with the grinder by means of holder having
both a lateral and revolving motion which thus ensures to the spring, a perfectly
true and square finished end.
1000
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in the Mode of Manufacturing Spiral Springs, and in
the Machinery therefor.
I, NORMAN BENNET ROBERTS of The Knowle, Sheffield in the County of
York, Works Manager, 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:-
My invention relates to improvements in the machinery for and in the mode of
manufacturing spiral springs from any section of steel by which the ends of the
springs are finished in a true and perfect manner and more expeditiously than by
the present process of manufacture.
According to the usual mode of manufacturing spiral springs it is necessary first
to taper at both ends the bar of steel from which the spring is to be coiled and after
coiling to smith the ends of the spring until such time as the surface of the said
ends is perfectly square with or at right angles to the axis of the spring itself and
my invention is designed to obviate the necessity of this tapering and smithing and
to square the ends by means of saws or cutters.

page_text: My invention is illustrated in the annexed sheet of drawings in which
Fig. 1, is an elevation of my machine for sawing spiral springs shewing spring
secured in its position in the carrier ready to be sawn.
Fig. 2, is an end elevation of the aforesaid machine, omitting the bed or
base A.
Like letters of reference indicate like parts in either of the figures.
In carrying my said invention into practice I proceed as follows:-
Upon any suitable bed or frame A, I mount or attach two or more standards B,
in such a manner that while they are firmly secured to the aforesaid bed or
frame A, they may be easily removed or replaced and are readily adjustable. In
any convenient position in the aforesaid standards B, I form a bearing C, which
carries a shaft D, upon this shaft I fix in the required position the saws or cutters E,
and the driving pulleys F.
To one face of the bed or frame A, I affix by means of bolts or otherwise the
bars or slides G, at right angles to the before-mentioned face of the bed or frame A,
I also make a bed plate or table H, and provide the same with suitable bearings or
sockets I, in such a manner that they will freely slide backwards and forwards upon
the beforementioned bars or slides G. To this bed plate or table H, I affix in the
required position a spring carrier J, in such a manner that it may be easily
removed, replaced, or adjusted, preferably by means of bolts taking into grooves as
shown.
Means are provided for feeding the saw with the coils to be sawn by means of
rack K, and pinion L, the aforesaid rack K, being secured to the face of the bed
or frame A, and passing through a bracket or guide M, which carries the aforesaid
pinion L.
To carry into operation my invention I proceed by fixing the spring N, into the
spring carrier J, preferably by means of one or more wheels and screws Q, attached
to cramping bars R (or their equivalents) as shown in Fig. 1.
Having set the saw in motion the pinion shaft O, is rotated by means of hand-
wheels P, moving the table H, towards the bed or frame A, until the spring comes
into contact with the saw. It will readily be seen that by rotating the aforesaid
pinion shaft O, and the rack K, being affixed to the face of the bed or frame A, a
horizontal movement will be imparted to the bed plate or table H, according to
whichever way the handwheels P, are rotated, and the spring carrier J, being
affixed to the aforesaid bed plate or table H, the spring will be carried forward
towards the saw or away from the saw as may be required.
It is obvious that may modify my invention by introducing a series of saws or
cutters E, so that I may cut off squarely a greater number of springs at one opera-
tion, without departing from the spirit of my invention.
Should it be found desirable to clear away any slight fash or fraze if any that
may be left on the spring ends this may be done afterwards by grinding with stones
or with circular cutters.
It will therefore be readily seen that springs manufactured and finished by my
improved process will be less costly, of greater exactness and uniformity, and in
doing away with the reheating which is necessary under the old system of manu-
facture I shall to a very great extent preserve the nature of the steel and ensure a
state of perfection in the ends and squareness of spiral springs which has been
hitherto unknown.
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 I
claim is :-
1-In the manufacture of spiral springs the process of cutting off and squaring
the ends of such springs at one and the same operation by means of saws or cutters
substantially in the manner herein before described.
2-In the manufacture of spiral springs the process of coiling a spring of indefinite

page_text: length, and then cutting it into the required lengths and squaring the ends of same
by the hereinbefore described means.
3-The machine for carrying my said invention into practice, constructed
substantially as hereinbefore described and as illustrated in the annexed drawings.
Dated the 15th day of March 1893.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.