Improvements connected with Pneumatio Tyres.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements connected with Pneumatio Tyres.
We, OTTO HELLSTERN, Electrician, 47, Darrell Road, E. Dulwich, in the
County of Surrey, and ROBERT HUNTER, Publisher, of 54, London Street,
Edinburgh, do hereby declare the nature of this invention to be as follows:
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That there shall be inside the tyres an air chamber, which can be made of any
suitable flexible material, and of any convenient shape or size. We propose using,
for convenionce rubber, tapered at each or either end, blocked tightly together
forming a valve, which will allow the air to pass through into the tyre when under
pressure only. Then there will be a third and similar valve pointing into the
compressing chamber to keep the same supplied with air continually.
For the purpose of self inflating without the aid of a pump, it will be placed
inside the tyre and will inflate the same by the weight passing over the air
chamber at each revolution of the wheel.
The weight immediatly it gets on the air chamber it will disperse it into the
tyre and will repeat this action at each revolution or at each time the weight is
put on and off the air chamber until a sufficient quantity of air has been inflated
to carry the necessary weight upon it.
OTTO HELLSTERN.
ROBERT HUNTER.
Improvements connected with Pneumatic Tyres.
We, OTTO HELLSTERN, Electrician, of 47, Darrell Road, East Dulwich, in the
County of London, and ROBERT HUNTER, of 54, London Street, Edinburgh,
Scotland, Publisher, 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:-
The object of our invention is to so construct pneumatic tyres that they shall
be inflated by coming in contact with the ground during the revolution of the
wheel to which they are attached, and the necessity for using an air pump thus
obviated.
In carrying our invention into practical effect, we attach to the inside of the
pneumatic tyre tube a ball or other conveniently shaped chamber of rubber, or
any other suitable flexible material. To one end of this chamber is fitted a non-
return valve which communicates with a suitable air inlet fitted to the rim of the
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page_text: wheel or otherwise conveniently placed. This valve admits air to the chamber
as hereinafter described, but allows none to return. To the opposite end of the
chamber is fitted a second non-return valve, this latter allowing the passage of
air from the chamber into the pneumatic tube.
As the wheel travels, that part of the tyre in which this chamber is situated
comes in contact with the ground once during every revolution of the wheel.
When such contact occurs the chamber is compressed by the superincumbent
weight of the vehicle and its load, and any air contained in it is expelled through
the said exit valve into the pneumatic tube. As the wheel now continues to
revolve, the weight is removed from the chamber which thereupon expands, there-
by drawing in a fresh supply of air through its in-take valve; and this action
continues until the tyre is sufficiently inflated to properly support the super-
incumbent weight.
We will now proceed to further describe our invention in connection with the
accompanying drawing, which is a longitudinal sectional view of a section of a
pneumatic tyre tube a having fixed within it the chamber of rubber, or other
suitable flexible material. Fitted to one side of the chamber b is an air inlet
valve C,
which communicates, by means of the tube t, with the air inlet 1. To
the opposite side of the chamber b is fitted the outlet valve c which communicates
with the air tube a. The valves o and e¹ are suitably supported by a stay, such
Ag S.
Screwed or otherwise suitably fitted to the head of the inlet / is a perforated
plate, grating, or the like g, and situated immediately below the grating g, and
between it and a wire gauze or other support g', is a packing p of any suitable
substance, such as cotton wool, or asbestos, to filter particles of dust, and the like,
from the air drawn into the chamber b. The tube e is an exit valve from the
tube a for the purpose of deflating the tyre if necessary.
When during the revolution of the wheel, the part of the tyre in which is
situated the chamber b comes in contact with the ground, the chamber b is com-
pressed by the superincumbent weight, and the air, or a portion of the air, con-
tained therein is expelled through the non-return valve c into the tube a. As
the wheel continues to revolve, the chamber is released, and, owing to its elastic
nature, expands again, and, in doing so, draws in a fresh supply of air through
the inlet 1, and non-return valve c; this fresh supply of air being expelled through
the valve c' into the tube a when the chamber b is compressed during the next
revolution of the wheel; and this action continues until the tyre is sufficiently
inflated to properly carry both the vehicle and its load.
It is obvious that our invention may be applied to either a single or double tube
tyre.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is: :-
A pneumatic tyre having the air tube thereof fitted with a chamber such as b
having inlet and outlet non-return valves operated substantially as and for the
purpose herein described.
DL: 20th 100
Dated this 20th day of November 1907.
CASTLE SMITH,
"Invention" Office, Mitre Court, Fleet Street, London, E.C.,
Agent for the Applicant.