Improvements in and connected with Pneumatic Tyres for Cycles and other Vehicles.
Year: 1893

page_text: Date of Application, 25th Jan., 1893
Complete Specification Left, 21st Oct., 1893-Accepted, 25th Nov., 1893
L
PROVISIONAL SPECIFICATION.
Improvements in and connected with Pneumatic Tyres for Cycles
and other Vehicles.
I, GEORGE CAMERON DOUGLAS, of Osborne Place, East Newport, in the
County of Fife, N.B. Consulting Engineer and Patent Agent, do hereby declare
the nature of this invention to be as follows:-
This invention relates to pneumatic elastic tyres fixed to the rims of wheels of
cycles or other vehicles in any known manner, and consists in improved means
for obtaining access to the air tube, improvements in the disposition and shape of
the material which forms the tread, thus lessening in a marked degree the liability
to the puncturing of such air tube, and improved methods of fastening the cover to
the rim, in this manner eliminating the "creeping" of the tyre.
In carrying out my invention, I make the outer cover in two parts, each of
which at its inner diameter is firmly and if desired, permanently fastened to the
wheel rim, and attach the outer diameter of one such to a continuous external ring
of novel construction. Such ring may be of metal, rubber, vulcanized fibre, or a
combination of these, such as for instance steel hoops or woven wire incorporated
with rubber, or the like. The internal face of such ring is provided with one or
more circumferential grooves. The other part of the cover is attached to another
and separate internal ring, which may or may not be continuous, its external face
being provided with circumferential projections, which are intended to fit into the
corresponding grooves of the external ring.
When the air tube is in position, the two halves of the cover with their rings, are
folded over it, the external ng embracing the internal; the internal grooves and
external projections being opposite one another, and preferably in touch." When the
air tube is inflated, it presses the internal ring against the external, and the greater
the air pressure, the more firmly the grooves and projectious bear against one
another. Some of the advantages gained by adopting the hereinbefore described
form of cover are:-
'
. A
The tread is thick, and of a determinate form independent of the shape due to
the action of the air tube. The cover is firmly fixed to the rim of the wheel.
By deflating the air tube. the inner ring may be immediately withdrawn from
position and the two sides of the cover folded back allowing complete access to the
air tube. The sides of the cover may be woven or cut in any known way and they
need not be covered with rubber, thus materially lessening the weight of the tyre,
as a whole.
Dated thin 92nd dor of Lan 1802
GEO. C. DOUGLAS & Co.,
41, Reform Street, Dundee, Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in and connected with Pneumatic Tyres for Cycles
and other Vehicles.
I, GEORGE CAMERON DOUGLAS, of Osborne Place, East Newport, in the
County of Fife, N.B. Consulting Engineer and Patent 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 pneumatic elastic tyres fixed to the rims of wheels of
cycles or other vehicles in any known manner, and consists in improved means

page_text: for obtaining access to the air tube, improvements in the disposition and shape of
the material which forms the tread, thus lessening in a marked degree the liability
to the puncturing of such air tube, and improved methods of fastening the cover to
the rim, in this manner eliminating the "creeping" of the tyre.
In order that my invention may be properly understood and readily carried into
effect, I have hereunto appended a sheet of explanatory drawings in the several
figures of which corresponding parts are marked with the same numerals of
reference.
Figure 1. shows in cross-section one modification of my improved tyre, with the
air tube inflated, and Figure 2. the same tyre with the air tube deflated;
Figures 3. and 4. another modification with the air tube respectively inflated and
deflated; and
Figures 5. and 6. yet another modification.
In carrying out my invention, I make the outer cover in two parts 10. and 11.
each of which at its inner diameter is firmly, and if desired, permanently fastened
to the wheel rim 12, and attach the outer diameter of one such to a continuous
external ring 13. of novel construction. Such ring may be of metal, rubber,
vulcanized fibre, or a combination of these, such as for instance steel hoops or woven
wire 14. incorporated with rubber, or the like. The internal face of such ring is
provided with one or more circumferential grooves 15. The other part of the
cover is attached to another and separate interual ring 16, which may or may not be
continuous, its external face being provided with circumferential projections 17,
which are intended to fit into the corresponding grooves 15. of the external ring.
When the air tube 18. is in position, the two halves 10. and 11. of the cover
with their rings, are folded over it, the external ring embracing the internal; the
internal grooves and external projections being opposite one another, and preferably
in touch. When the air tube is inflated, it presses the internal ring against the
external, and the greater the air pressure, the more firmly the grooves and pro-
jections bear against one another. Some of the advantages gained by adopting the
hereinbefore described form of cover are:-
The tread is thick, and of a determinate form independent of the shape due to
the action of the air tube. The cover is firmly fixed to the rim of the wheel. By
deflating the air tube the inner ring may be immediately withdrawn from position,
and the two sides of the cover folded back, allowing complete access to the air
tube. The sides of the cover may be woven or cut in any known way, and they
need not be covered with rubber, thus materially lessening the weight of the tyre
as a whole.
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.
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.) In wheels provided with pneumatic tyres, the mode of clinching the two
portions of the cover together by air pressure, and of obtaining access to the air
tube, substantially as herein before described and illustrated by the accompanying
drawings.
(2.) In pneumatic tyres, covers, substantially as described and illustrated by the
accompanying drawings.
October 1893.
GEO. C. DOUGLAS & Co.,
41, Reform Street, Dundee, Agents for Applicant.