Improvements in Appliances for Securing or Attaching Pneumatic Tyres to the Rims of Wheels.
Year: 1892

page_text: Date of Application, 5th Feb., 1892
Complete Specification Left. 5th Nov., 1892-Accepted, 4th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Appliances for Securing or Attaching Pneumatic
Tyres to the Rims of Wheels.
We, JAMES WEDDERBURN OGILVY WALKER, of Bishop Street, Moss Side,
Manchester, in the County of Lancaster, Foreman India-rubber Worker, JOHN
DUNCAN, of Thornbank Pollokshields, Glasgow in the County of Renfrew,
Tramway Secretary and Manager, and WILLIAM STELFOX of Lorne Street,
Moss Side, Manchester, in the County of Lancaster, Tin Plate Worker, do hereby
declare the nature of this invention to be as follows:-
This invention refers to pneumatic tyres for cycle or other wheels and is designed
with the object of simplifying their construction and the means of attaching the
same to the rim of the wheel.
It consists essentially in forming the rim proper of the wheel with three grooves
or recesses. Over this rim a second rim or sliding bridge is placed which is
tightened thereon by means of a rack and pinion or similar device. On the second
rim or sliding bridge is placed the pneumatic tube and then the final thick rubber
covering, the edges or beading of which are bound between the outer recesses of
the rim proper and the second rim or sliding bridge.
In carrying out the invention the rim proper is formed with three grooves or
recesses, the two outer ones to receive the edges of the outer covering of thick
rubber and the inner one to provide space for the rack and pinion device on the
second rim or sliding bridge and for some projections for holding same in position.
This second rim or sliding bridge is made flat or arched and of a width say equal
to the rim proper, and the outer edges are turned back so as not to present a cutting
edge to the outer covering of the tyre. This rim is formed for a few inches
telescopic and on the sliding portion is fixed a rack which gears with a pinion also
fixed on the rim. The spindle of this pinion is screwed and projects through a
slot in the rim proper and is there held by means of a spoon shaped piece fitting
the outward contour of the centre recess in the rim and held in position by a nut.
A small detachable key is used for turning the spindle operating the pinion. On
the inner side of this rim are fixed a number of projections fitting into the inner
recess of the rim proper to hold it in position thereon. Both rims are provided
with holes through which the valve for inflating or deflating the pneumatic tube
projects.
It will be obvious that this construction will present the whole of the pneumatic
tyre to the ground consequent upon its being unable to overlap the metallic rim;
and that should the pneumatic tube be punctured the outer thick covering of rubber
will present a tyre although not inflated, to which no injury would result.
Dated this 4th day of February 1892.
W. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
COMPLETE SPECIFICATION.
› Improvements in Appliances for Securing or Attaching Pneumatic
Tyres to the Rims of Wheels.
We, JAMES WEDDERBURN OGILVY WALKER, of Bishop Street, Moss Side,
Manchester, in the County of Lancaster, Foreman India-rubber Worker, JOHN
DUNCAN, of Thornbank, Pollokshields, Glasgow, in the County of Renfrew,
5 Tramway Secretary and Manager, and WILLIAM STELFOX, of Lorne Street,
Price &

page_text: a square and a small detachable key is employed for turning the spindle and
operating the pinion.
Both rims A and D are provided with holes through which a valve for inflating
and deflating the pneumatic tube B is inserted.
We wish it to be understood that the invention does not consist in nor does it of
necessity require a bead extending along the edges of the outer cover C nor does
it consist in any special formation of wheel rim or clamping rim or hoop to embrace
such a bead but the outer edges of both the wheel rim A and the clamping rim D
are preferably turned back so as not to present a sharp edge or one liable to cut the
outer covering C of the tyre.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a pneumatic tyre in which the inner tube B and outer cover C are attached
or secured to the wheel rim A by a clamping rim or hoop D the combination with
the clamping rim or hoop of a rack and pinion whereby the two ends can be drawn
together so as to tightly clamp the edge of the outer cover between the two rims
substantially as described.
2. In appliances for securing or attaching pneumatic tyres to the rims of wheels
the combination and arrangement of parts substantially as and for the purposes
described and shown.
Dated this 4th day of November 1892.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.