Improvements in Air Valves.
Year: 1897

page_text: Date of Application, 23rd Dec., 1897-Accepted, 9th Apr., 1898
Improvements in Air Valves.
We, JAMES HARRY KEIGHLY MCCOLLUM, Electrician, of 1001, Bathurst Street,
REMIGIUS ELMSLEY, Esquire, of 35, Adelaide Street, East, and WILLIAM HENRY
BROUSE, Barrister, of Corner Wellington and Church Streets, all of the City of
Toronto, in the County of York, in the Province of Ontario, Canada, 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:-
Our invention relates to improvements in air valves more particularly adapted for
pneumatic tyres for bicycles and the object of the invention is to design a simple
form of valve, which will be perfectly air tight and impossible to get out of order
and not affected by dirt getting into it, and which may also be changed quickly
without taking the tyre from the wheel and it consists essentially of a valve provided
with an outer casing and stein and an inner casing and stem fitted into the outer
casing and stem and an annular passage-way around its stem, which has a central
passage-way,a tube preferably of rubber being provided upon the inner stem, portion
of which is cylindrical in form to fit the stem while the lower end is in flat form,
the sides of which fit closely and air-tightly together, the valve being otherwise
constructed in detail as hereinafter more particularly explained.
Fig. 1, is a perspective sectional view of portion of the tyre showing our improved
valve in connection with our improved form of.air pump, which forms the subject
matter of our previous applications.
Fig. 2, is an enlarged sectional perspective detail of the valve portion in Fig. 1.
Fig. 3, is an enlarged perspective detail of the inner casing and stem.
Fig. 4, is an enlarged perspective detail of an alternative form of air valve, which
we provide for ordinary pneumatic tyres.
In the drawings like letters of reference indicate corresponding parts in each
figure.
A is the outer casing of the valve, which is provided with a downwardly extend-
ing stem A¹ having a central passage-way a. B is the inner casing of the valve,
which is provided with a flange b and a downwardly extending stem B¹ having a
passage-way 6. The inner casing B is provided at its exterior with a thread 6²,
which is screwed into a corresponding thread a² in the interior of the casing A.
The stem B¹ extends downwardly through the stem A' leaving the passage-way a
an annular one.
C is a tube preferably of rubber, which has a cylindrical upper end C¹ and flat
lower portion c¹, which sides c normally abutt each other, so closely that they are
perfectly air tight from all outward pressure of the air in the air tube D. Being
blastic of course they may be separated by inward pressure.
The upper end of the casing B is provided with an extension B2, which has
diametrically located notches B3 cut in same.
E is the lock collar located above the casing B and surrounding the extension B².
F is a
The lock collar E is provided with an internal circumferential groove e.
metal bent tube leading from the groove e of the lock collar E down to the branch

page_text: passage-way H connected to the tread pumping tube I, which is salient feature of our
previous applications numbered 26286 and bearing date the 20th November, 1896,
and 24530 and bearing date the 22nd October, 1897.
G is the cap of the valve, which is provided with an internally threaded stem g
extending down into the interior of the extension B2 but not sufficiently far to
entirely close the notches B³.
2 is a washer preferably of rubber located between the top of the casing A and
the bottom of the flange of the casing B. 3 is a washer preferably of rubber located
between the top of the flange b of the casing B and the bottom of the lock collar E.
4 is a washer preferably of rubber located between the bottom of the flange of the
cap G and the top of the lock collar E.
J is a disc preferably of rubber having a central hole j located in the bottom of
the casing B and with the hole j opposite the central passage-way b¹ of the stem B¹.
K is a screw stem provided with a central passage-way k leading out laterally
from near the bottom, an upper turning knob k¹, and a disc-shaped lower end k².
In the position in which the valve is shown in Figs. 1 and 2 the tread I has a
connection through the pipe F groove e, opening around the collar E, notches B³,
inner cylinder B and passage-way b¹ thereof and valve tube C, the air as it is being
pumped distending the sides c c and passing into the interior of the central air
tube.
From the form of valve shown it will be seen that it will be impossible for any
dirt to be lodged in any part of the valve as it is would be blown directly through.
The valve is supported in the usual manner by the mushroom-shaped rubber stem,
which extends through a hole in the rim and is securely cemented on the inner side
to the inner tube.
It will be seen by removing the outer cap G that the ordinary hand pump may
be inserted to pump the tyre.
Should it be desired to not pump the automatic tube in the tread passage the
screw K. may be lowered so that the lower disc-shaped portion k² is against the end
of the passage-way b¹, when it will be seen that the air instead of passing into the
inner air tube will merely pass out through the central passage-way k.
Another great advantage in our valve is that it can be removed from the wheel
without disturbing the tyre in any manner whatsoever. When we utilize our valve
ordinarily for pumping pneumatic tyres we would simply dispense with the collar E
and provide a plain cap G¹.
Our valve may also be used for wheels in other vehicles and for various other
purposes.
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 :-
1. A. valve for bicycles comprising a tube having a permanently distended
portion suitably supported and connected to the exterior of the air tube and an
inner portion extending through the air tube and having flat abutting sides
elastically held together as and for the purpose specified.
2. A valve for bicycles comprising an outer casing and stem suitably supported
to the outside of the air tube and provided with a central passage-way through the
stem, an inner casing and stem extending down into the passage way of the outer
stem and provided with a central passage-way and an elastical tube having a
permanently distended portion and au inner portion, the sides of which are flat and
abutt each other and are elastically held together as and for the purpose specified.
3. A valve for bicycles comprising an outer casing and stem suitably supported
to the outside of the air tube and provided with a central passage-way through the
stem, an inner casing and stem extending down into the passage-way of the outer
stem and provided with a central passage-way and an elastical tube having a
permanently distended portion and a flat inner portion, the sides of which are flat
and abutt each other and are elastically held together, an upward extension provided

page_text: with sides notches, a locking collar provided with an inner groove and a tube leading
therefrom to the pumping passage-way and a suitable cap with threaded stem
screwed into the inner casing, so as to leave an opening at the bottom of the
notches as and for the purpose specified.
Dated the 23rd day of December 1807
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.