Improvements in and connected with Pneumatic Tyres and Metal Rims for Cycles and other Vehicles.
Year: 1892

page_text: Date of Application, 29th Nov., 1892
Complete Specification Left, 17th July, 1893-Accepted, 19th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in and connected with Pneumatic Tyres and Metal
Rims for Cycles and other Vehicles.
I, ALEXANDER BLACK, of 90 Commercial Street, Dundee, in the County of
Forfar, N.B. Cycle 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 the wheels
of cycles or other vehicles by means of wires or hoops surrounding the rim, and
cousists in improved means for tightening such wires or hoops, and to provide
simple means of allowing the inner inflated tube of the tyre to be removed for
repair; the improvements being more particularly intended for tyre covers open'at
the side next the rim, or of horseshoe section.
In carrying out my invention, I make the section of the wheel rim hollow or
concave on the side next the tyre, the concavity being of various forms, such as
the part of a circle, or curve approximating thereto, two incline planes meeting at
a point, or two planes merging into a curve, the edges of such rim preferably
terminating in suitable beads or ridges. The wires for securing the tyre cover to
the rim, are fastened to the canvass which carries the outer covering of rubber,
such canvass bearing against the rim, and these wires may be in one continuous
piece, or they may be capable of being uncoupled as may be found most suitable.
The concavity is of such depth as to allow of the wires being easily placed around
or about the rim, even though they are continuous.
Let me now point out the nature and scope of my improvements.
When the tyre is around the wheel rim and deflated, the wires may be in
proximity to each other, that is to say near to the plane through the smallest
diameter of the rim, and if separated by equal distances from such plane, will bear
upon the rim at planes of greater diameter. When the tyre is inflated the stress
due to the pressure of the air will stretch the wires and also will force them further
apart, thus causing them to firmly bear against the rim at planes where the
diameters are still greater than aforesaid.
Dated this 28th day of November 1892.
.
GEO. C. DOUGLAS & Co.,
41, Reform Street, Dundee, Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in and connected with Pneumatic Tyres and Metal
Rims for Cycles and other Vehicles.
1, ALEXANDER BLACK, of 90 Commercial Street, Dundee, in the County of
Forfar, N.B. 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 pneumatic elastic tyres, fixed to the rims of the wheels
of cycles or other vehicles by means of wires or hoops surrounding the rim, and
consists in improved means for tightening such wires or hoops, and to provide
simple means of allowing the inner inflated tube of the tyre to be removed for
repair, the improvements being more particularly intended for tyre covers open at
the side next the rim, or of horseshoe section.
The description of my improvements is assisted by a sheet of explanatory
drawings hereunto appended and hereinafter referred to.

page_text: Figure 1. shows a cross-section of the tyre with the air tube deflated, Figure 2.
the same tyre with it inflated, and
Figures 3. and 4. other modifications of the wheel rim.
In these drawings the same reference numerals are used to mark the same or like
parts wherever they are repeated.
In carrying out my invention, I make the section of the wheel rim hollow or
concave on the side next the tyre, the concavity being of various forms, such as
the part of a circle as illustrated at Figures 1. and 2. or approximating thereto,
two inclined planes meeting at a point (Figure 3), or two planes merging into a
curve (Figure 4), the edges of such rim preferably terminating in suitable beads
or ridges 5. The wires 6. for securing the tyre cover to the rim are fastened to the
canvas 7. which carries the outer covering of rubber 8. such canvas bearing against
the rim, and these wires 6. may be in one continuous piece, or they may be capable
of being uncoupled, as may be found most suitable. The concavity is of such
depth as to allow of the wires being easily placed around or about the rim, even
though they are continuous.
Let me now point out the nature and scope of my improvements. When the
tyre is around the wheel rim and deflated, the wires 6. may be in proximity to each.
other, that is to say near to the plane through the smallest diameter. When the
tyre is inflated the stress due to the pressure of the air will stretch the wires and
also will force them further apart, thus causing them to firmly bear against the
rim at planes where the diameters are still greater than aforesaid.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I wish it to be understood
that I am aware that it has been proposed to secure pneumatic tyres to rims of
wheels by means of continuous wires or bands, and I lay no claim at large to such
construction but, I declare that what I claim is :-
(1) In wheels provided with pneumatic tyres, the wheel rim as described and
illustrated with reference to Figures 1. and 2. of the appended drawings.
(2) In wheels provided with pneumatic tyres, the wheel rim, as described and
illustrated, with reference to Figure 3. of the appended drawings.
(3) In wheels provided with pneumatic tyres, the wheel rim, as described and
illustrated, with reference to Figure 4. of the appended drawings.
Dated this 15th day of July 1893.
GEO. C. DOUGLAS & Co.,
41, Reform Street, Dundee, Agents for Applicant.