Improvements in Shielded Rubber Tyres for Vehicles of all Descriptions
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Shielded Rubber Tyres for Vehicles of all
Descriptions,
I, ROBERT MITCHELL, JR., of 84, Kent Road, Glasgow, N.B., Blacksmith, do
hereby declare the nature of this invention to be as follows:-
-
This invention relates to improvements in rubber tyres for vehicles of all
descriptions in which the resilient portion of the tyre is shielded from the ground
by a steel or iron channel of any approved shape which has its channel or grooved
out portion looking towards the sole and hub of the wheel. The edges of this
channel overlap the sides of the wooden rim or felloe, both on its face and back
sides (that is to say when shrunk on to its position). Only a small portion of
the web of the channel to overlap in this way. The sole of the wheel is grooved
out in its centre so that it may receive the resilient portion. At the bottom of
this groove or along either side of it we may have a strap of iron; or wires,
electro welded or twisted (in their position) or we may fit on a small channel.
Or the resilient portion may be directly applied to the wooden rim, no binder
being used.
The resilient portion may be made up of a rubber or other composition tube
filled with air or other gas, or may be put in in chambered sections of suitable
form or may be of solid rubber throughout and all the sections, or tube, or solid
rubber may be made in any shape approved of so long as it fits to grooved out
sole of wheel but may or may not fit exactly the shield channel on outside. The
bottom of the groove of the shield channel may have rubber or other suitable
material put in its sole so that this may bear on the sole or sole tyre of the wheel
at the places where the section or tube does not interpose, when compression is
applied to the shielded tyre.
Improvements in Shielded Rubber Tyres for Vehicles of all
Descriptions.
I, ROBERT MITCHELL, JR., of 84, Kent Road, Glasgow, N.B., Blacksmith, 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 impratamanta in nubhan terreng. for rahiolan of all

page_text: by an outer steel or iron channel tyre and has for its object, by an improved
arrangement and construction of the several parts constituting the tyre, to ensure
that the outer or ground tyre is completely isolated from the other parts of the
wheel by the rubber or other resilient material, thus stifling and preventing
the transmission of vibration to the carriage or vehicle to which the wheels are
fitted, and overcoming the defects found in tyres as at present in use.
But in order that my said invention may be more readily understood and
easily carried into effect I will proceed to describe the same with reference to the
accompanying sheet of drawings in which
Fig. 1 is a side view and
Fig. 2 a cross section of a portion of the felloe of a wheel with my improved
tyre.
Figs. 3 and 4 are cross sections shewing two modified means whereby the
resilient portion of the tyre may be connected to or secured upon the felloe of
the wheel.
Referring to Figs. 1 and 2 of the said drawings, I employ an outer metal or
ground tyre A of a channel shape in section bent to the circumference of the
wheel, with its channel or grooved out portion looking towards the centre or
hub thereof, the flat sole of the channel thus revolving on the ground when the
wheel is in motion.
The free edges of the webs a of the channel ground tyre A are on a level with
or slightly below the topmost edge of the felloe B, when the highest point of
the wheel is considered, but do not in the resting position, or under ordinary
circumstances, have actual contact with the felloe but stand clear of it on both
sides.
The resilient portion of the tyre consists of a strip C of rubber or other
suitable material surrounding the wheel, of the section shewn, that is to say
having butts or horns c of a breadth equal to the inner sole of the outer ground
tyre A against which they bear. The surface of these butts fits into the ground
tyre when pressure is exerted on same, but may not however lie flat against the
inside sole when the pressure is removed, but be formed concave as shewn in
Fig. 2, thus increasing the resiliency.
The surface of the butts c does not fill the whole depth of the channel, measur-
ing from edge of web to bottom of groove as the lower portion is reserved for
expansion, but by reason of its breadth and concavity of surface expands under
pressure into the channel or grooved tyre and thus effectually prevents the said
outer tyre coming into contact with the felloe of the wheel.
The tail portion c¹ of the rubber tyre C may be of any convenient shape in
section and retained in a groove of corresponding shape formed in the felloe of
the wheel as in Figs. 1 and 2, or may be retained by a channel iron tyre D, having
broad webs d, secured upon the felloe of the wheel as shewn in Fig. 3; or the
rubber tyre may be secured by a small channel iron E recessed or imbedded in
the felloe of the wheel as shewn in Fig. 4. When the groove is made directly
in the wood of the felloe as first described, a small iron tyre, or wire, d³ may be
employed for binding the various segments together.
The rubber tyre may be made of a continuous strip of rubber either solid
or formed with a core through its centre; or the tyre may be made up of
sections of solid rubber or cored out sections either sealed or open at the ends.
Or the resilient portion may be made up of a rubber or other composition
tube filled with air or other gas.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
1. The improved shielded rubber tyre for vehicles of all descriptions, substan-
tially as herein before described and shewn in the accommo

page_text: 2. A shielded rubber tyre, consisting of the outer channel shaped ground
tyre A, resiliently carried upon the wheel by the inner rubber tyre C, formed
with butts or horns c to bear against and expand into the sole and walls of the
outer channel tyre and retained upon the wheel by the tail portion c¹ of a shape
corresponding to a groove formed in the felloe as shewn in Figs. 1 and 2; or
retained in a channel iron secured to the felloe as shewn in Figs. 3 and 4, sub-
stantially as herein before described and shewn in the accompanying drawings.
Dated this 29th day of August 1899.
JOHNSONS,
Applicant's Agents, 115, St. Vincent Street, Glasgow.