IMPROVEMENTS IN THE METHOD OF ATTACHING TYRES TO RAILWAY WHEELS
Year: 1878

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company,
Patent Solicitors, at Frankfort-on-the-Maine, in the Empire of Germany,
for the Invention of "IMPROVEMENTS IN THE METHOD OF ATTACHING TYRES
TO RAILWAY WHEELS." A communication from Adam Brenzinger, Engineer, a
person resident at Carlsruhe, in the Empire of Germany..
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 7th March 1878.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort-on-the-Maine, in the Empire of Germany. "IMPROVEMENTS IN THE
METHOD OF ATTACHING TYRES TO RAILWAY WHEELS." [A communication from
Adam Brenzinger, Engineer, a person resident at Carlsruhe, in the Empire of
Germany.]
.
This Invention relates to improvements in the method of attaching tyres to
railway wheels.
In carrying the said Invention into practise I turn off a portion of the surface of
the tyre along the whole extent of its inner circumference, leaving a projecting piece
on the side of the tyre opposite to the flange thereof. This projecting piece extends
all round the inner surface of the tyre.
The sides of the rim or periphery of the wheel to which the tyre is to be attached
are turned off along their entire circumference at an angle of about 60°, the angle
being such that the said rim is wider at its outer circumference than at its inner
circumference. The aforesaid projecting piece extending around the inner circum-
ference of the tyre is cut with a corresponding angle. The tyre is made red hot and
the wheel is placed in the said tyre in such a manner that the said angle of the rim
of the wheel fits into the corresponding angle in the said projecting piece on the
tyre. The aforesaid projecting part of the tyre and a lateral projection on the
Dis 671

page_text: opposite side of the same are then welded over the rim of the wheel, all around the
same.
In order to prevent the possibility of the tyre so attached sliding over the rim of
the wheel I provide screws at intervals passing through the said rim and into the
tyre.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frank Wirth in the Great Seal Patent Office on the 6th September
1878.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort-on-the-Maine, in the Empire of Germany. "IMPROVEMENTS IN THE
METHOD OF ATTACHING TYRES TO RAILWAY WHEELS."
A communication from
Adam Brenzinger, Engineer, a person resident at Carlsruhe, in the Empire of
Germany.
This Invention relates to improvements in the method of attaching tyres to
railway wheels.
"
The said Invention is illustrated in the accompanying Drawing.
Figure 1 is a transverse section of a portion of a wheel tyre.
In carrying the said Invention into practice I turn off in a lathe a portion of the
interior of this tyre, leaving a projection a at the side of the tyre opposite to the
flange b thereof, as shewn in transverse section in Figure 2, which projection extends
all around the inner surface of the tyre.
The rim A of the wheel to which this tyre is to be attached has its sides turned in
a lathe to an angle of about 60°, as shewn in Figure 3, which is a transverse section
of the rim with the tyre fixed thereon. The aforesaid projecting piece a extending
around the inner circumference of the tyre is cut to a corresponding angle or
bevel.
The tyre, as shewn in Figure 2, is made red hot, and the wheel is placed in
the said tyre in such a manner that the bevelled rim c fits the bevelled surface
of the projection a on the tyre. This projection a of the tyre and a lateral
projection d on the opposite side of the said tyre, are then by forging turned
over upon the rim A of the wheel, as shown in Figure 3, and welded all around the
same.
In order to prevent any possibility of the sliding or slipping of the said tyre upon
the rim of the wheel to which it is attached I provide at suitable intervals screws e
passing through the said rim and into the tyre, as shown.
Figures 4 and 5 represent on an enlarged scale a modification of the said Invention,
Figure 4 being a transverse section of a tyre prepared for fixing upon a wheel, and
Figure 5 a sectional view through the rim of a wheel with tyre attached.
The tyre after having been formed, as shewn in Figure 4, is made red hot and the
wheel placed within the same, when the part f of the rim of the wheel rests on
the nose a. The projection d is then forced over upon the part f¹ of the rim of the
wheel..

page_text: The rim of the wheel is provided with radial cuts or slots about 3/, the of an inch
wide and formed of suitable depth (see Figure 5, line g, h). During the process of
forcing down, the projection d upon the wheel part of the material is forced into these
cuts or slots, and thus any turning of the tyre on the wheel is prevented.
Having thus fully described the said Invention, and the manner of performing
I wish it understood that I claim,―
the same,
First. Securing the tyre upon the rim of the wheel by welding the former over the
sides of the latter, as above described.
Second. The turning-off or bevelling of the sides of the rim of a wheel, as and for
the purposes specified.
Third. In combination with the said tyre secured upon the bevelled rim the
employment of the screws, as shewn in Figure 3, or of the radial cuts or slots, as
shewn in Figure 5 of the Drawings, as and for the purpose specified.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand
and seal, this Twentieth day of August, in the year of our Lord One
thousand eight hundred and seventy-eight.
BARE