Apparatus for Use in Rolling Steel Bars of Channel Section to Produce Railway Chairs.
Year: 1895

page_text: Date of Application, 22nd Jan., 1895-Accepted, 23rd Feb., 1895
COMPLETE SPECIFICATION.
Apparatus for Use in Rolling Steel Bars of Channel Section to
Produce Railway Chairs.
1, WALTER NEILSON, of The Clydebridge Steel Company (Limited), Cam-
buslang, in the County of Lanark, Steel 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 :-
This invention relates to apparatus designed for use in rolling steel bars of
channel section with side wings, to produce bars of railway chair or like section
having a longitudinal channel whose sides are inwardly bent or beveled or inclined
to the base and from which railway chairs are formed by cutting the bars trans-
versely. For this purpose a sectional mandril is secured between the rolls which
are so cut as to roll or press down in the rolling operation the vertical sides of the
channel bar upon the mandril whose section at a point between the rolls corresponds
to the desired internal shape of the channel.
In the accompanying drawings which illustrate the invention
Figure 1 is an end view of the rolls showing one modification of the mandril and
the chair section of bar passing through the rolls,
Figure 2 is a transverse vertical section of the rolls showing the mandril in
elevation and Figure 3 is a plan of the same.
Figures 4, 5 and 6 are similar views showing a modified construction of the
mandril.
In the modification shown at Figures 1, 2 and 3 the top roll A of the pair A, A',
is cut or grooved and the mandril B, B¹, is carried through the groove a and
secured at its ends to the housings or framework C of the rolling mill, its ends
being bent upwards to permit of the winged channel bar being easily entered
between the rolls and freely leaving the mandril. The mandril is composed of two
strong side pieces or supports B, B, and a central removable acting part B¹,
secured between them and only on this latter part, which may be readily changed
when worn out or injured or for another of different section, do the rolls press
down or shape the sides of the channel bar. This part B of the mandril is
made of slightly smaller size than the opening between the jaws of the finished
chair so that the bar passes through the rolls with but little friction on the
mandril.
'
;
In the modification shown at Figures 4, 5 and 6 the mandril is bent downwards
aud secured both to the housings and the base of the rolling mill, the lower roll A¹
being grooved for its reception. The channel bar is in this case carried through
in inverted position, and is pressed or shaped upon the central movable part B₁ of
the mandril. One of the rolls may run loose or both may be coupled to force
through the bar and the rolling operation may be completed in a single passage of
the bar between the rolls or by two or more passes during which the sides of the
channel may be gradually pressed down to the desired shape. The mandril may
be made hollow and water passed through it to keep it cool. The winged channel
bars to be rolled into chair section may be made up of a plain channel bar rested on-
a flat or recessed bar and united by rolling or of two angle bars similarly rested on
and united to a flat or recessed bar.
In forming the railway chairs the winged channel bar after its passage through
the rolls is cut transversely by a series of saws or cutters acting simultaneously and
suitably spaced to cut the desired width of chair. By punching bolt holes in the

page_text: jaws the chair may be used as a combined chair and fish plate for securing the
meeting ends of the rails for which purpose a mild steel chair is suitable not being
liable to fracture like a cast iron chair. The keys may be made of wood, metal,
or both.
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. Apparatus for rolling steel bars of railway chair or like section composed of
a pair of rolls one of which is suitably grooved and a sectional mandril whose acting
part is removable substantially as described.
2. In combination with the rolls of a rolling mill a mandril made in separable
sections substantially as and for the purpose set forth.
Dated this 21st day of January 1895.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62, St. Vincent Street, Glasgow, Agent for the Applicant.