Improvements in or connected with Vehicles having Pneumatic Wheels or Tyres.
Year: 1893

page_text: Date of Application, 27th May. 1893
Complete Specification Left, 26th Feb., 1894-Accepted, 31st Mar., 1894
PROVISIONAL SPECIFICATION.
Improvements in or connected with Vehicles having Pneumatic
Wheels or Tyres.
I, FRANK KING of 4 Great Winchester Street in the City of London, Engineer
do hereby declare the nature of my invention to be as follows:-
My invention relates to pneumatic wheels or wheels having pneumatic tyres and
has for its object to overcome the difficulty hitherto existing in turning such
wheels sideways in guiding the vehicle to which they are attached owing to the
extent of the surface of the tyre or periphery of the wheel which is in contact
with the road which extent of surface is approximately equal in square inches of
area to the weight upon the wheel divided by the internal pressure in the wheel
or tyre in pounds per square inch.
According to my invention 1 make such a wheel in parts or members or
in lividual wheels of comparatively small or narrow bearing on the road making
in effect a compound wheel with the required total area of bearing surface and so
arranged that each part, member or individual wheel is capable of rotation
independently of the other part or parts member or members or individual wheel
or wheels by which means the resistance to turning in guiding the vehicle is
minimised.
Dated this 27th day of May 1893.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.
COMPLETE SPECIFICATION.
Improvements in or connected with Vehicles having Pneumatic
Wheels or Tyres.
I FRANK KING of 4 Great Winchester Street in the City of London, 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:—
My invention relates to pneumatic wheels or wheels having pneumatic tyres and
has for its object to overcome the difficulty hitherto existing in turning such
wheels sideways in guiding the vehicle to which they are attached owing to the
extent of the surface of the tyre or periphery of the wheel which is in contact
with the road which extent of surface is approximately equal in square inches of
area to the weight upon the wheel divided by the internal pressure in the wheel
or tyre in pounds per square inch.
According to my invention I make such a wheel in parts or members or
individual wheels of comparatively small or narrow bearing on the road making
in effect a compound wheel with the required total area of bearing surface and
so arranged that each part, member or individual wheel is capable of rotation
independently of the other part or parts member or members or individual wheel
or wheels by which means the resistance to turning in guiding the vehicle is
minimised.
In order that my invention may be well understood I will describe with
reference to the accompanying drawings the manner in which it may be carried
into practical effect.

page_text: Figures 1 and 2 illustrate a compound wheel constructed according to my
invention the shaded portion in Figure 2 indicating the area of the bearing surface
of the wheels on the ground with a certain load.
Figures 3 and 4 shew an ordinary single pneumatic wheel having the same
weight sustaining power as the compound wheel shewn in Figures 1 and 2.
Figure 4 indicating the area of the bearing surface on the ground with the
same load as that being carried by the compound wheel as shewn in Figure 2.
It will be understood that in the comparisons of the area of bearing surface on
the ground the internal pressure in the wheels is taken as unit for both cases.
It will be evident that in turning the axle a Figures 1 and 2 on its centre bas
shewn in Figure 5, the member c of the compound wheel travels a much less
distance than the members d e of the said compound wheel and the tyres of the
members c d e at their bearing surfaces c³ ³ d¹² e¹ e², are not dragged over the
ground to anything like the extent as is the case with a wheel like that shewn in
Figures 3 and 4 and having the same carrying capacity as will be clear by reference
to ffin Figure 6 as it will be seen that the tread of the compound wheel as
indicated in Figures 2 and 5 as it travels over the ground must be reckoned as
from the central line of such tread, in which case the portions on either side are
travelling at different rates, the one a minus amount and the other a plus amount
to the rate at which the central line is travelling. By using a multiple or com-
pound wheel according to my invention each of the members of which is free to
move independently of its neighbour and the strain of turning resulting from
dragging such a large mass over the ground as is indicated in Figure 6, ƒ ƒ³ is
very materially diminished.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is.—
In or for vehicles or carriages multiple or compound pneumatic wheels or
multiple or compound wheels having pneumatic tyres substantially as and for the
purposes herein before described and illustrated by the examples shewn in the
accompanying drawings.
Dated this 26th day of February 1894.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, Agents.