Improvements in and relating to Detachable Pneumatic Tyres for Cycles and other Vehicles.
Year: 1897

page_text: Improvements in and relating to Detachable Pneumatic Tyres for
Cycles and other Vehicles.
I, HENRY GOULD DIXON, of 41, High Street, Dundee, in the County of Forfar,
Scotland, Cycle Agent, do hereby declare the nature of this invention to be as
follows:
This invention relates to improvements in detachable pneumatic tyres for cycles
and other vehicles, the objects being to secure the tyre to the rim, even when
deflated, in a new and improved manner, and to readily obtain access to the
interior.
In carrying out my invention, I make the tyre or the cover of such a section
that when in position it is in the form of a horse shoe and open next the rim. Its
edges may be thickened, and preferably, though not necessarily, extensible.
Around the inside of the tyre is placed a broad band of metal, or other suitable
material or materials, such band forming an airtight seal over the opening in the
tyre, its extremities being drawn towards each other and secured by nuts and
a right and left hand screw. These nuts are fixed, one to each extremity of the
band, and to the surface nearest to the axis of the wheel, that is to say the nuts
and the screw are outside the space which contains the compressed air, and are
either inside or outside the rim. The band is of such a breadth that it overlaps the
space in the tyre next the rim. When the band is tightened the edges of the
tyre are pressed into a recess in the rim, and consequently the combination of the
tyre and the band forms an airtight space, except at the joint where the extremities
of such band meet. A thin flexible flap or rubber or other suitable material
attached to the tyre or to the band, completely covers the aforesaid joint, so that
when the tyre is inflated no air can escape there. If desired, the flap may continue
completely round the tyre. Sometimes I may make the two extremities of the
band to rest upon a rubber platform. Such a type is applicable as a single or a
double tube tyre. The air valve is fastened to the band, in the case of a single tube
tyre, consequently the band is always secured and the valve never requires to be
unfastened for puncture repairs.
Sometimes the nuts on the band are within the hollow of the rim, in which
case the screw is rotated by means of a lever which passes through a hole in the
rim. At other times the ends of the band terminate in radial pins which project
through an elongated hole in the rim, such pins being drawn together by a bolt
and external nuts; or by external nuts and bolts placed side by side.
Such pins
may have in addition, nuts, whose purpose is to draw the extremities of the bands
down on the tyre after they have been drawn together. The extremities of the

page_text: bands may overlap or they may not. Where the pins project through the rim
there is a tendency for their axes to incline towards each other, such tendency may
be obviated by the use of two screws whose axes are parallel and in a plane normal
to the axis of the wheel and simultaneously rotated by toothed nuts gearing into
one another, either directly or in combination with an intermediate wheel.
Dated this 10th day of April 1897
Improvements in and relating to Detachable Pneumatic Tyres for
Cycles and other Vehicles.
I, HENRY GOULD DIXON, of 41, High Street, Dundee, in the County of Forfar,
Scotland, Cycle Agent, 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 improvements in detachable pneumatic tyres for cycles
and other vehicles, the objects being to secure the tyre to the rim, even when
deflated, in a new and improved manner, and to readily obtain access to the
interior.
And in order that my said invention and the manner of performing and carry-
ing the same into effect or practice may be properly understood, I have hereunto
appended an explanatory sheet of drawings in which the same reference numerals
are used to indicate corresponding parts in all the figures where shown.
Figure 1. is a cross-section at B. B. (Figure 2) showing one modification of a
tyre.
Figure 2. is a part longitudinal section at A.A. (Figure 1) of same.
Figure 3. is an isometric view of a portion of the flap which is attached to the
band..
Figure 4. gives details of the band fastening, the various parts being detached.
Figure 5. is a cross-section at C. C. (Figure 6) showing another modification of
a tyre.
Figure 6. is a part longitudinal section at E. E. (Figure 5) and
Figure 7. is a part sectional plan at D. D. (Figure 5) of same.
In carrying out my invention, I make the tyre or the cover of such section that
when in position it is in the form of a horse shoe and open next the rim 10. Its
edges 11, may be thickened and preferably, though not necessarily, extensible.
Around the inside of the tyre is placed a broad band 12, of metal or other suitable
material or materials, such band forming an airtight seal over the opening in the
tyre, its extremities being drawn towards each other and secured by nuts 13, and a
right and left hand screw 14. These nuts are fixed, one to each extremity of the
band, and to the surface nearest to the axis of the wheel, that is to say the nuts
and the screw are outside the space which contains the compressed air, and are
preferably inside the rim. By the aid of Figure 4, is described in greater detail
the construction and action of such screw and nuts.
The nut holders 15, are attached to the extremities Y, and Z, of the band in
any suitable known way, The nut holder on the extremity Z, is pushed through
the slot 16, in the extremity Y, the nuts 13, are placed in their respective re-
ceptacles and the right and left hand screw 14, made to engage with them. By
placing the extremity Y, under the other extremity Z, the band is made to more

page_text: nearly conform to a true circle when it is tightened and consequently it bears
more or less uniformly on the edges 11. The band 12, is of such a breadth that
it overlaps the space in the tyre next the rim. When the band is tightened the
edges of the tyre are pressed into a recess in the rim as shewn, and consequently
the combination of the tyre and the band forms an air tight space, except at the
joint where the extremities Y, and Z, of such band meet. A thin flexible flap 17,
of rubber or other suitable material, preferably attached to the band, completely
covers the aforesaid joint, so that when the tyre is inflated no air can escape there.
Preferably the flap extends completely round the tyre, that is to say the band is
completely encircled circumferentially by the flap. 18, is the ordinary inflatable
inner tube which may or may not be used.
In attaching the tyre to the rim the band 12, with its flap 17, is first placed in
position after adjusting the screw 14, so that it is expanded to its largest diameter.
If an inner air tube be used it is made to encircle the band, its air valve being
attached to and passing through such band, so as to form an air tight joint. The
other air valve which is used for the single tube is also attached to the band in an
airtight fashion. It is placed close to the other valve, both being situated as
nearly as possible opposite the band joint. The edges 11, of the cover are passed
under the enlarged band, naturally adapting themselves to the recess in the rim.
The band is then tightened by means of the screw 14, which is caused to rotate by
a pin acting on the holes 18*; access to these being obtained through the hole 19.
in the rim. The single tube is then inflated by means of its valve, and should it be
punctured, the inner air tube may then be inflated by means of its valves.
Sometimes, as in the second modification, and as illustrated by Figures 5, 6,
and 7, I may make the two extremities of the band to rest upon a rubber plat-
form 20, in which case the flap 17, may not be used, as the band bears continuously
on the cover, and therefore makes an airtight joint. Such a type is also applicable
as a single or a double tube tyre.
In attaching this other tyre to the rim, the band is first uncoupled and passed
through the cover so that the platform 20, is underneath. It is then coupled
together and placed in position on the rim, the edges of the cover are then placed
in the recess in such rim and the band is tightened, and finally the tyre is
inflated.
The advantages in connection with tyres of the type described are as follows:-
They are easily manipulated, quickly detached, can be made a single or a double
tube at will, the air tube cannot be nipped, the tyre does not roll, there is little side
slip, the cover cannot fly off the rim and the tyre can be ridden deflated.
I wish it to be particularly understood that I do not limit myself to the precise
details of construction herein before described and illustrated on the annexed
drawings, but that I hold myself free to make such changes and alterations as
conform with the disposition and scope of my invention.
my
said inven-
Having now particularly described and ascertained the nature of
tion and in what manner the same is to be performed, I declare that what I
claim is:
(1) In pneumatic tyres, the mode of securing the cover to the rim, of obtaining
access to the inside of the cover, or to the inner air tube, substantially as
hereinbefore described and illustrated by Figures 1, 2, 3, and 4.
(2) In pneumatic tyres, the mode of coupling the two ends of the band together,
substantially as hereinbefore described and illustrated by Figures 1, 2, 3, and 4.
(3) In pneumatic tyres, the mode of making the band to form an airtight joint
by means of the flap 17, substantially as described.
(4) In pneumatic tyres, the mode of securing the cover to the rim, of obtaining
access to the inside of the cover, or to the inner air tube, substantially as
hereinbefore described and illustrated by Figures 5, 6, and 7.
(5) In pneumatic tyres, the mode of making the band to form an airtight joint

page_text: by means of the edges 11, and platform 20, substantially as herein before described
and illustrated by Figures 5, 6, and 7.
Dated this 10th day of January 1898.
GEO. C. DOUGLAS & Co.,
41, Reform Street, Dundee, Agents for Applicant.