Improvements in Machines for Fixing Tyres onto Wheels.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Machines for Fixing Tyres onto Wheels.
1, JOHANN CHRISTIAN HEINRICH KUNZ, of Crönsberg, near Frankfort-on-Maine,
in the German Empire, Mechanical Engineer, do hereby declare the nature of
this invention to be as follows:-
This invention relates to machines for fixing tyres onto wheels the said
machines being of the class in which the tyre is forced onto the wheel by
concentrically operated cheeks or jaws for example as described in the Specifica-
tions of Letters Patent Nos. 10920 A.D. 1894 and 24379 A.D. 1897.
The machine constructed in accordance with the present invention has the
advantage over machines as hitherto devised for the same purpose that but small
power is required for securing the tyre, cold, in a rapid and reliable manner
and it can be effected by hand power. A machine is constructed according to
my invention as follows:-
Rigidly secured in position by braces are radiating fork-shaped roller-holders,
adapted to slide radially in slots. Bevel-rollers are fitted within the forks and
these are rotatable upon vertical axes and are provided with flanges which
engage in a conical screw-thread in the interior of a steel-casing rotatable
either by machinery or by hand for example by means of a hand lever fitted
with a catch or pawl.
Upon the ends of a shaft, passing through the machine, and provided with
fast and loose pulleys and a band shifter for imparting forward or rearward
motion is a worm in gear with a worm-wheel secured on a spur-wheel which
gears with teeth in the rim of the steel casing, and thereby turns such casing
either in one or the other direction, according to the way the driving-gear is set.
And at the same time, the said steel casing, by reason of the conical surfaces
of its inner screw-thread, has a rising or descending movement, as the case may
be, which causes the machine either to open or to close.
The wheel to be provided with a tyre, and also the tyre to be secured to it,
are secured between cheeks, by means of a screw-spindle, the space between
the tyre and the forks of the roller-holders being filled up with radial filling
pieces corresponding to the diameter of the wheel, while the rear surfaces of
such holders serve as compressing surfaces.
When the steel casing is screwed downwards, it will, by reason of its conical
shape, exercise a driving, or forcing, action upon the tyre, on all sides, as it
rotates; its rotatory motion being uniform owing to the guiding action of the
rollers, which are pressed towards their outward position by springs on guiding-
spindles, so that the flanges projecting from the rollers are maintained in the
grooves of the screw-thread within the steel-casing.
Upon the steel-casing rests a hoop having apertures by means of which it is
moved up and down on guiding standards screwed to the bed-plate.
The object of this hoop is to maintain the steel-casing in the proper position
by means of vertical and horizontal rollers arranged at intervals on the said
hoop so as to prevent its being displaced by the pressure of the hand-lever or

page_text: the spur-wheel. To this end; both the central bearing of the spur-wheel and
the hinge of the hand-lever are firmly connected with the said hoop.
Dated this 5th day of July 1899.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
Improvements in Machines for Fixing Tyres onto Wheels.
I, JOHANN CHRISTIAN HEINRICH KUNZ, of Crönsberg, near Frankfort-on-Maine,
in the German Empire, Mechanical Engineer, 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 machines for fixing tyres onto wheels the said
machines being of the class in which the tyre is forced onto the wheel by.
concentrically operated checks or jaws for example as described in the Specifica-
tions of Letters Patent Nos. 10920 A.D. 1894 and 24379 A.D. 1897.
The machine constructed in accordance with the present invention has the
advantage over machines as hitherto devised for the same purpose that but small
power is required for securing the tyre cold, in a rapid and reliable manner
and it can be effected by hand power.
I will describe my invention with reference to the accompanying drawings of
which Figure is a longitudinal vertical section and Figure 3 a plan of the
improved machine; Figure 2 illustrates the roller guide arrangement herein-
after referred to, and Figure 4 is a section of one of the rollers employed in
connection with the guide. a (Figure 1) is a table or platform rigidly secured
in position and strengthened by webs or braces a¹ on which table or platform
rest a number of radiating fork-shaped roller holders having projections adapted
to slide radially in slots in the table or platform. Bevel rollers C (one of
which is shewn in seotion in Figure 4) are fitted within the forks of the holders b
these rollers being rotatable upon vertical axes and provided with ribs or
flanges which engage in a screw thread formed in the conical interior surface
of a steel casing which is rotatable either by machinery or by hand, for example
by means of a hand lever g (Figures 1 and 3) fitted with a catch or pawl to
engage with teeth on the periphery of the casing f.
To drive by power, a shaft is provided with a fast pulley, and two loose
pulleys for open and cross driving bands operated by a band shifter & the
said shaft carrying also a worm in gear with a worm wheel secured to or
formed in one with a long spur wheel m which gears with teeth on the flange
or rim of the steel casing f. By shifting the driving bands by means of the
band shifter k so as to shift one of the said bands onto the fast pulley the other
band remaining on its loose pulley the casing of can be rotated in one or the
other direction, as required according to which band is shifted onto the said
fast pulley and at the same time the steel casing by reason of the screw thread
on the internal conical surfaces engaging with the ribs on the rollers C has a
rising or descending movement, as the case may be, imparted to it which causes
the roller holders 6 to slide radially towards or from the centre of the table 'or
platform and carry with them the radial compressing jaws J. In Figure 1 p
represents a wheel, with a tyre to be secured to it, held in position between the
cheeks by means of a screw spindle r, the space between the tyre 7 of the wheel
and the forks of the roller-holders 6 being filled up with radial filling pieces

page_text: such as Saccording to the diameter of the wheel while the inner ends of the
roller holders b press against the jaws J.
When the steel casing f is screwed downwards as shewn on the right hand
side of Figure 1 it will by reason of its internal conical shape exercise a driving
or forcing action through the roller holders and jaws J upon the wheel tyre,
on all sides the rotatory motion of the casing being uniform owing to the guiding
action of the rollers C, which are pressed outwards by springs on guiding-
spindles so that the ribs or flanges e on the rollers are maintained in gear
with the screw-thread in the steel-casing.
Supported on the upper edge of the steel-casing f, by rollers, is a hoop v
(Figures 1, 2 and 3) having apertures therein through which pass stationary
guide rods ic on which the said hoop can move up and down.
The object of this hoop is to maintain the steel-casing f in the proper position
by means of the vertical rollers and the horizontal rollers y (Figure 2) arranged
at intervals on the said hoop so as to prevent the said casing from being displaced
by the pressure of the hand-lever or the spur-pinion m when rotating the casing.
The central bearing of the pinion m and the hinge of the lever handle y are
firmly connected to the said hoop by brackets z.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, 1 declare that what
I claim is
1. In a machine for fixing tyres onto wheels the combination with means for
holding a wheel, and the tyre to be fixed thereon, in position, of radially sliding
cheeks or jaws, to press upon the tyre, radially sliding roller carriers bearing
against the backs of the cheeks or jaws, rollers mounted so as to rotate on the
carriers; ribs or flanges on the peripheries of the rollers; an internally coned
casing surrounding the rollers, a screw thread formed in the conical interior
surface of the casing and engaging the ribs or flanges on the rollers, and means
for rotating the casing so as to cause it to rise or descend according to the direc
tion in which it is turned and as it rotates in one direction force the roller
carriers and the cheeks or jaws inwards towards the wheel and thereby press
the tyre upon the wheel substantially as herein before described.
2: The combination and arrangement of parts constituting the improved
machine for fixing tyres outo wheels substantially as herein before described
and illustrated by the accompanying drawings.
Dalad this 5th day of Anril 1900
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.