Improvements in Elastic Wheel Tyres for Velocipedes.
Year: 1892

page_text: Date of Application, 17th May, 1892
Complete Specification Left. 16th Feb., 1893-Accepted, 18th Mar., 1893
PROVISIONAL, SPECIFICATION.
Improvements in Elastic Wheel Tyres for Velocipedes.
I JOHN PINCHBECK of No. 5 Camden Row, Peckham Road in the Parish of
Camberwell and County of Surrey Civil Engineer do hereby declare the nature of
this invention to be as follows:-
For carrying out this invention I take a ribbon of spring steel about one inch
wide more or less and about 20 to 30 wire guage (Birmingham) thick which I wind
diagonally round a mandril of a suitable diameter for the tyre, the angle of advance
being about one inch so as to form a continuous steel surface. When a sufficient
length has been formed to encircle the wheel I withdraw the mandril and subject
the spiral band to the process of tempering. I then insert a core of light
caoutchouc or canvas to prevent the dust or mud of the road from finding its way
through the interstices into the interior of the tyre. This being now complete it.
is strained round the wheel and fastened to the rim by suitable screws.
elasticity of the tyre depending solely on the steel ribbon above described.
Dated this 17th day of May 1892.
The
JOHN PINCHBECK.
COMPLETE SPECIFICATION.
Improvements in Elastic Wheel Tyres for Velocipedes.
JOHN PINCHBECK of No. 5 Camden Row, Peckham Road in the Parish of
Camberwell County of Surrey Civil Engineer 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 :-
In carrying out this invention I take a ribbon of spring steel about one inch
wide more or less and about 20 to 30 Birmingham wire guage in thickness which I
wind diagonally round a mandril or core of a diameter suitable for a tyre the
angle of advance being about one inch so as to form one continuous surface of
steel. When sufficient length has been formed to encircle the wheel I withdraw the
mandril and subject the spiral band to the process of tempering. I then insert in
the steel tube a core of light caoutchouc or canvas to prevent the dust or mud of
the road from finding its way through the interstices into the interior of the tyre..
This being now complete it is strained round the wheel and fastened to the rim
by suitable screws. The elasticity of the tyre depending solely on the steel
ribbon above described.
The accompanying drawing will make my meaning clear.
Fig. 1 shews the tyre in elevation a is the steel tyre b the hollow lining to same
c the rim of wheel. Fig. 2 is a section the letters having same meaning. I also
use in the construction of these tyres bands of unequal width, narrower at
the points d, d, where the T screws pass through the rim by of an inch gradually
increasing so that when the coil is formed there will not be any spaces between.
succeeding coils on the periphery of the wheel and thereby obviate the employment
of any internal lining. Fig. 4 shows the coil a, and rim c' straitened and also the
T screws e, e, which pass through the half round holes d, d, between two coils
securing them to the rim by the same screw head. Should any portion of the tyre
be injured it may be cut out and a new piece inserted, the same T screws forming
the junction between the pieces which lap over each other.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare what I
claim is
1st. The construction of a spiral tyre of a single ribbon of steel.
2nd. The method of fixing same to the rims by means of T headed screws &
nuts which secure at once two adjacent coils.
3rd. The use of a steel band of unequal width as described.
JOHN PINCHBECK.