Improvements in Draw-bar Springs for Railway Wagons.
Year: 1894

page_text: Date of Application, 28th June, 1894
Camelota Specification Loft 11th Man 1005 Accented
42th
Ane 4005
PROVISIONAL SPECIFICATION.
Improvements in Draw-bar Springs for Railway Wagons.
JAMES DUCE Roll Turner, Tinsley Sheffield do hereby declare the nature of
this invention to be as follows:-
That instead of taking rolled flat iron or steel I take two pieces of iron or steel
rolled to a section & weld them at the points of contact under small hammer or
press.
The improvement or Patent lies in the making of the hoops for this certain class
of springs & is adaptable for other kinds.
The "double double hoops" are used for "draw bar" springs underneath the
railway wagons not as axle springs & is quite a distinct hoop from the ordinary
axle spring hoop.
Date : 074L 1
C T
1001
Improvements in Draw-bar Springs for Railway Wagons.
I, JAMES DUCE, Roll Turner, Tinsley, Sheffield, do hereby declare the nature
of this invention and in what manner the same has to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention relates more particularly to an improved method of constructing
the hoops or boxes of drawbar springs for railway wagons, and which are technically
known as "double double "hoops.
The object of the invention is to avoid having to weld the parts of such hoops
in certain places, as is necessary under the present system of manufacture, and
this enables me to produce a stronger hoop without increasing the cost.
I have illustrated the method of carrying out the invention in the annexed sheet
of drawings, in which like letters of reference indicate like parts in any of the
figures.
Figs. 1 and 2, represent part of a rolled bar from which the hoop is constructed.
Fig. 3, is the plan and side view of two lengths of the bar, prepared for welding
together, on enlarged scale.
Fig. 4, shows a modification in preparing the parts for welding.
In carrying out my invention, I first prepare a pair of rolls, and roll the material
to the form or thereabouts as shown in Figs. 1, 2, that is of the desired width
and with projections A, at regular intervals, the short intermediate spaces B, being
thinner than the longer spaces C.
The bar so rolled is then cut up into lengths by dividing it through the centre
of the long spaces C, as indicated by the dotted lines.
The projections are then brought to proper form for welding either by a single
"scarf" D, as seen in Fig. 3, or a double scarf as represented in Fig. 4, or in any
other form that will produce a sound central weld, and the ends of the bar are
rounded as seen in Fig. 3, the bolt holes E, being produced when most convenient.
The parts are then welded together at D, and the hoop trued up to form.

page_text: I may if desirable, for example in the case of hoops of greater width, insert a
glut made from a bar rolled to the desired form, between the projections at D, and
thus increase the width.
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. The improved process of manufacturing the hoops for drawbar springs,
technically known as "double-double," substantially as hereinbefore described and
shown.
2. The manufacture of "double-double" hoops for drawbar springs from bars
rolled with transverse projections from which the crossbars of the hoop are formed,
and welding the ends or edges of the said projections together centrally or there-
abouts substantially as herein before described with reference to the drawings
annexed.
Dated the 6th day of March 1895.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.