Year: 1887

page_text: Date of Application, 24th Mar., 1887
Complete Left, 19th Nov., 1887
Complete Accepted, 20th Dec., 1887
We, HENRY PARKIN, of 8, Albert Terrace, Bow, in the County of Middlesex,
Engineer, and HENRY WEBB, of 140, Campbell Road, Bow, aforesaid, General
Merchant, do hereby declare the nature of this invention to be as follows:-
:-
This invention of improvements in wheels and tyros has reference to the formation
of the tyres or peripheries of wheels intended to be used on common roads where
tram or other rails are laid, the objects being to prevent the wheels or their tyres
entering grooves or channels formed by rails, and also to enable the wheels to readily
mount and pass over rails or obstructions projecting above the surface of the road.
For this purpose it has been proposed to construct tyres serrated at both edges so that
a development of the tyre would resemble at each edge the cutting edge of a saw, the
notches between the teeth extending entirely through the metal of the tyre, and
corresponding recesses being formed in the sides of the rim or felloes of the wheel.
Such a construction would give at the edges of the tyre what may be described as
elongated saw teeth with sharp undercut points that would soon become blunted in
practice the making of the notches quite through the substance of the tyre would
weaken the tyre considerably; with the form of tooth referred to there would be at
each tooth a perpendicular or over-hanging face and the back of the tooth would be a
straight incline stopping short of the point of the tooth in order to strengthen the
point. Now, my invention has reference to a construction of tyres or wheel rims that
shall present all the advantages (besides others) of the construction above indicated,
without the defects thereof, my improved formation being such that in the case of a
tyre there is no cut entirely through or removal of the entire thickness of the metal
and that the sides of the wheel rim or felloes do not require to be recessed or notched
or cut away, which would not only weaken the wheel, but would moreover produce
inclined faces on the rim or felloes that would be exposed to injury by stones etc.
A tyre according to my invention is made at its inner circumference of uniform
width that may be equal to or may exceed that of the wheel rim. At each edge of
the tyre, and, as I prefer, in alternate order, notches or recesses of peculiar shape are
formed, which extend to a point some distance within the edge of the tyre at its
Price 8d.1

page_text: outer circumference or periphery. The formation is such as to present in side view of
the tyre not a series of sharp points but a series of rounded ramps or curved surfaces
each extending from the inner circumference of the tyre (or a point near it) in an
outwardly rounded form, to the outer circumference or periphery of the tyre, and cach
becoming gradually wider and wider as it proceeds towards the outer circumference or
periphery of the tyre, and being bounded at one side by a surface of the main part of
the tyre that is itself of a curved and rounded form, and which, as seen in a
development of the tyre, extends (as respects its base) by a gradual curve from a
point some distance within the edge of the tyre outward and downward to the foot of
the ramp; and (as respects its top) by a longer and more gradual curve outward to
the edge of the tyre, at a point considerably in advance of the foot or commencement
of the ramp.
As will be evident, similar notches may be formed in the rims of wheels constructed
without separate tyres ; and it will be noted that with rounded ramps formed as
described, the rolling tyre or wheel will be enabled to mount a projecting tram rail or
other obstruction, and that there will be no sharp points or edges liable to become so
worn by use as to rapidly impair the efficiency of the tyre or wheel.
1311 11- ALL
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.

page_text: We, HENRY PARKIN, of 8 Albert. Terrace, Bow, in the County of Middlesex,
Engineer, and HENRY WEBB, of 140, Campbell Road, Bow, aforesaid, General
Merchant, 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 of improvements in wheels and tyres has reference to the formation
of the tyres or peripheries of wheels intended to be used on common roads where
tram or other rails are laid, the objects being to prevent the wheels or their tyres
entering grooves or channels formed by rails, and also to enable the wheels to readily
mount and pass over rails or obstructions projecting above the surface of the road.
For this purpose it has been proposed to construct tyres serrated at both edges so
that a development of the tyre would resemble at each edge the cutting edge of a saw,
the notches between the teeth extending entirely through the metal of the tyre, and
corresponding recesses being formed in the sides of the rim or felloes of the wheel.
Such a construction would give at the edges of the tyre what may be described as
elongated saw teeth with sharp undercut points that would soon become blunted in
practice; the making of the notches quite through the substance of the tyre would
weaken the tyre considerably; with the form of tooth referred to there would be at
each tooth a perpendicular or over-hanging face and the back of the tooth would be a
straight incline stopping short of the point of the tooth in order to strengthen the
point. Now, my invention has reference to a construction of tyres or wheel rims that
shall present all the advantages (besides others) of the construction above indicated,
without the defects thereof, my improved formation being such that in the case of a
tyre there is no cut entirely through or removal of the entire thickness of the metal,
and that the sides of the wheel rim or fellocs do not require to be recessed or notched
or cut away which would not only weaken the wheel, but would moreover produce
inclined faces on the rim or felloes that would be exposed to injury by stones etc.
A tyre according to any invention is made at its inner circumference of uniform
width that may be equal to or may exceed that of the wheel rim. At each edge of the
tyre, and, as prefer, in alternate order, notches or recesses of peculiar shape are
formed, which extend to a point some distance within the edge of the tyre at its outer
circumference or periphery. The formation is such as to present in side view of the
tyre not a series or sharp points but a series of rounded ramps or curved surfaces each
extending from the inner circumference of the tyre (or a point near it) in an
outwardly rounded form, to the outer circumference or periphery of the tyre, and each
becoming gradually wider and wider as it proceeds towards the outer circumference or
periphery of the tyre, and being bounded at one side by a surface of the main part of
the tyre that is itself of a curved and rounded form and which, as seen in a
development of the tyre, extends (as respects its base) by a gradual curve from a
point some distance within the edge of the tyre outward and downward to the foot of

page_text: the ramp and (as respects its top) by a longer and more gradual curve outward to
the edge of the tyre, at a point considerably in advance of the foot or commencement
of the ramp.
As will be evident, similar notches may be formed in the rims of wheels constructed
without separate tyres ; and it will be noted that with rounded ramps formed as described,
the rolling tyre or wheel will be enabled to mount a projecting tram rail or other
obstruction, and that there will be no sharp points or edges liable to become so worn
by use as to rapidly impair the efficiency of the tyre or wheel.
Referring to the accompanying sheet of drawings,
Fig. 1 is an edge view and
Fig. 2 a side view of a wheel provided with a tyre constructed according to this
invention.
1 is the tyre made of uniform width at its inner circumference and equal to that of
the wheel rim 2.
The notches or recesses at the sides of the tyre are in the example illustrated
arranged in alternate order which we consider preferable. Each notch or recess
extends to a point 3 some distance within the edge of the tyre at its outer
circumference or periphery and is formed with a rounded or curved surface 4
constituting a rounded ramp that extends from a point 5 near the inner circumference
of the tyre in an outwardly rounded form, the said surface becoming gradually wider
and wider and finally merging into the outer circumference or periphery of the tyre
as shown.
6 is a rounded surface at one side of each of the curved surfaces 4; it is curved
both in the direction of the circumference of the tyre and in a direction at right
angles thereto extending on one side by a gradual curve from the point 3 outward
and downward to the point 5 and on the top side by a longer and more gradual
curve outward from the point 3 to the point 7 as shown.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. A tyre or a wheel rim formed with notches or recesses having curved or
rounded surfaces such as hereinabove described with reference to the drawings for the
purpose specified.
The improved tyro as described and shown
Dated this 18th day of November A.D. 1887.
HENRY PARKIN.
HENRY WEBB.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.