Improvements in the Manufacture of Wheel Tyres.
Year: 1898

page_text: Date of Application, 25th Mar., 1898-Accepted, 30th Apr., 1898
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Wheel Tyres.
We, HENRI GABELLE, of Crouzot, France, and JOSEPH CHANTRAINE, of Angleur,
Belgium, Mechanical Engineers, 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 the present invention is to render the external rolling surface of
wheel tyres, while in the rough, very circular.
As at present manufactured, the external surface of wheel tyres, when in the
rough or unfinished state, are not very truly circular, such having variations of 2
to 4 millimetres. When it is desired to have well fitted rolling stock, as loco-
motives, carriages, wagons, and tenders, it is necessary before the wheels are finished,
to remove (by turning) undulations or irregularities which exist on the running
surface of the tyres.
This turning operation occasions in the first place considerable expense, but it
is especially inconvenient in that it causes the removal of the crust or external
surface of the tread, and it is moreover injurious to the metal at different depths,
as the turning down takes place, for the reason that at certain places there are
bosses or undulations which are removed by such turning. Now it is known that the
crust and the most exterior layers of metal give a greater resistance to wear.
Our new process obviates these inconveniences.
In the manufacture of unfinished tyres as now made, there is produced at the roll-
ing of tyres, a ring having the exterior and interior surfaces formed with a sufficient
exactitude as to transverse section, but the circular surface of same are irregular.
The tyre rolling machine gives these interior and exterior surfaces diameters which
approach from 4 to 7 millimetres of the proper diameters of the finished tyres.
The tyres thus prepared are then submitted to the following operations:.
The tyre is placed on a table and is there fixed by clamps not shewn, while inside
of the tyre B there is applied a mandril composed of three or four segments S as
shewn in the drawing annexed, where Fig. 1 is a part plan view and Fig. 2 a part
vertical section.
By a strong hydraulic pressure a piston cone P is caused to expand or spread
out the segments S which then exercise pressure on the internal surface of the
tyre. The tyre is then turned somewhat and pressure is repeated, and after a
certain number of such adjustments, the tyres are obtained of a regular diameter,
but with an irregular or undulating exterior surface.
The cause of this is that the pressure having been given by segments which are
each respectively forced outwards from the centre, their action is not uniform upon
the whole internal surface of the tyres.
Now our invention consists in effecting this latter operation in part substantially
as has been before described, but according to our invention we place outside the
tyre a ring F as in the drawings the internal surface of which is turned exactly
true and corresponds to the required running surface of the tyre.
It is against the interior surface of this ring F that the tyre is forced during the

page_text: pressing and by the use thereof unfinished tyres are obtained the rolling surface
of which is regular and very circular.
The advantages are:-
1. The dispensing with the external turning of the tyre surfaces.
2. The preservation of the external crust produced by the rolling of the metal 5
whereby the rolling surface has greater homogenity.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed we declare that what we
claim is:
In the manufacture of tyres for wheels, the employment of an external ring 10
turned exactly true and against the interior surface of which the tyre is forced
during the pressing operation, and thereby obtains a very regular and circular roll-
ing surface without turning, substantially as described and shown.
AUL
1000
1740CT
BREWER & SON,
London and Leeds, Agents for the Applicant.
BREWER & SON,
London and Leeds, Agents for the Applicant.