A New or Improved Tyre for Bicycles, Tricycles, and the like.
Year: 1892

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 18 of the Patents, &c., Act, 1883), as allowed by
the decision of the Chief Examiner of the 6th day of January 1897.
Date of Application, 12th May, 1892
Complete Specification Left, 10th Feb., 1893-Accepted, 11th Mar., 1893
A New or Improved Tyre for Bicycles, Tricycles, and the like.
I, DAVID CROWTHER of Pickford Street, Milnsbridge, Huddersfield
Yorkshire, Chemist, do hereby declare the nature of this invention to be as
follows:-
This invention refers to the tyres of bicycles, tricycles and other like machines
or vehicles, and my improvements consist in making such tyres elastic or springy
so as to yield or give to pressure and regain their normal condition when the
pressure is removed.
In carrying out my invention I make the tyre of two, three or more sheets of
india rubber or other suitable elastic or yielding substance or material cemented
together or otherwise secured at the edges, or moulded in one piece, so that when
secured to the rim or felloe of the wheel, the said sheets of rubber will be drawn
or bent in the form of a "bow or ordinary tyre in cross section.
"
The sheets of rubber are of different widths so that when bent, they fit con-
centrically one within the other after the manner of tubes and so as to leave a
space or channel between each sheet, such said spaces allowing the outer or larger
sheets to be depressed to a certain extent solely against their own resistance, but
when they abut upon the inner bent sheets the resistance of the latter is added .to
that of the former, whereby, whilst yielding or giving to pressure or weight to a
desireable extent the tyre retains its firmness and buoyancy.
The compound tyre constructed as above set forth is preferably made flat where
the edges are joined together or terminate in solid bases, and the periphery of the
rim or felloe of the wheel is adapted to receive same, the sides of the said rim
being turned up, and the edges of the tyre provided with corresponding beading or
inclined projecting surfaces which engage with the upturned sides of the rim so as
to secure the tyre thereto.
All strain upon the upturned sides of the rim is prevented by a sheet of canvas
or other suitable material which is secured to the opposing edges or sides of the
tyre and bears the strain which is incident to the tendency to expansion of the
base of the tyre. The surface of the tyre may also be protected by a canvas
wearing pad which is easily attached and removed, and, when worn, can be
replaced at little cost.
The shape of the tyre in cross section may vary somewhat from that described,
or it may be made round, in which case, however, additional weight would be
added without any corresponding advantage.

page_text: I may modify the construction of the compound yielding or elastic tyre above
described by employing curved or circular steel springs instead of sheets of india
rubber and securing within said springs other springs of smaller diameter, or a core
of india rubber tubing. These springs are covered and kept in position by a thin
sheet of india rubber or other suitable material and their action under pressure is
similar to that previously described.
A New or Improved Tyre for Bicycles, Tricycles, and the like.
I, DAVID CROWTHER, of Pickford Street, Milnsbridge, Huddersfield,
Yorkshire, Chemist, do hereby declare the nature of this invention and in what
inanner the same is to be performed, to be particularly described and ascertained
in and by the following stateinent :—
This invention refers to the tyres of bicycles, tricycles and other like machines
or vehicles and my improvements consist in making such tyres elastic or resilient
so as to yield or give to pressure and regain their normal condition when the
pressure is removed.
In carrying out my invention I make the tyre of two or more sheets or bands of
india rubber or other suitable elastic material, or mould it in one piece of said
material, with an air space on the inside.
If made of separate bands of india rubber one is made narrower than the other
and when they are bent they form two arches in cross section leaving an air space
between each arch.
In order that my invention may be more fully understood reference is herein
had to the accompanying sheet of drawings, wherein :-
Figs. 1, 3 are transverse sections of wheels made according to my invention.
In Fig. 1 the tyre a is moulded in one piece with an air space b through it
forming two arches, an outer one a¹ forming the bearing surface and an inner
one a².
c is the metal rim or felloe curved inwardly and turned up perpendicularly
at the edges or sides. The base of the tyre is contracted to fit it into the rim and
when inserted therein it expands and binds tightly against the turned up edges,
cement being run into the rim to secure the lower ends of the tyre thereto as
indicated at d, d. e is one of the spokes of the wheel. The outer arch a¹ is
strengthened by a canvas or other textile lining a³ secured thereto in manufacture,
so as to reduce liability of the outer arch being blown during the process of
vulcanization, or the canvas lining may be secured to the inner arch at as indicated
by dotted lines.
Instead of being moulded in one piece as at Fig. 1 two bands of india rubber
of different widths may be employed and bent one over the other so that when
inserted into the rim c they shall form two arches a¹, u, with an air space b
between them as shewn in Fig. 3. The outer band a may be strengthened by
a sheet of canvas or other textile material ³ secured to the inner walls during
manufacture.
The outer arch a¹ of the tyre is depressed by pressure thereon against its own
resistance but if the pressure forces it down into the air space and against the
inner arch a² of the tyre, the resistance thereto is considerably augmented
whereby while easily yielding to pressure the tyre is resilient and free to cushion
the wheel much more effectively than a solid or ordinary cushion tyre.
--

page_text: The construction of tyre as herein before described is better adapted to cushion
the wheel than an ordinary cushion or solid tyre, possessing more of the
characteristics of a pneumatic or inflated tyre for resilience, and, in combination
with the section of rim employed therefor, it is not liable to slip laterally when
running over greasy or inclined surfaces.
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:
Firstly. The combination, with an outer flexible arched tyre such as a, of an
inner arch such as a¹ composed of india rubber or other suitable material with an
air space 6 intermediate of same, substantially as shewn and for purposes herein
described.
Secondly. The combination, with a curved metal rim having its edges or sides
turned up perpendicularly, of a compound tyre having two arched portions one
within the other and an intermediate air space, substantially as and for purposes
herein shewn and described.
Thirdly. Tyres for cycles and other vehicles constructed substantially as
described and shewn in the drawings.
Dated this Oth day of February 1893
TASKER & CROSSLEY,
Halifax and Huddersfield, Agents.