Improvements in Detachable Caps for Air Valves, suitable for Pneumatic Tyres and other Inflatable Articles.
Year: 1896

page_text: Date of Application, 2nd June, 1896
Complete Inccification Loft 43th Bud 1806 Accented 17th Oct 1808
Date of Application, 2nd June, 1898
Complete Specification Loft, 13th Aug, 1906 Accepted, 17th Ort 1896
PROVISIONAL SPECIFICATION.
Improvements in Detachable Caps for Air Valves, suitable for
Pneumatic Tyres and other Inflatable Articles.
A communication from abroad by GEORGE BADENOCH DOHERTY, of Chowringee,
Calcutta, in the Empire of India, Engineer.
I, DAVID DOHERTY, of 12 Moss Street, Garston, near Liverpool, in the
County of Lancaster, Architect, do hereby declare the nature of this invention to
be as follows:-
The object of this invention is to enable the removable cap of an air valve for a
pneumatic tyre to be connected to one of the spokes of a cycle wheel by a chain in
such a manner that it can be screwed or unscrewed without necessarily turning
the chain. Hitherto the removable caps of air valves for cycle tyres have been
made to terminate in a button shaped 'head, the shank of which is encircled by
closing around it one of the links of an ordinary attaching chain, the other end
of which is similarly connected to one of the wheel spokes. In practice this
mode of connecting the removable cap to the wheel is such that the cap cannot
be freely screwed on or off the air valve and the attaching chain is liable to
become twisted to such an extent as to cause the links to open sufficiently to
allow them to become uncoupled from the cap with the result that the cap is very
liable to be lost.
Now this invention has for object to obviate this disadvantage for which
purpose I provide the extended closed end of the removable cap with a swivel
shackle so that the cap can be turned independently of the chain to which the
shackle is connected.
In one construction of this kind the shackle is formed with a boss that
is journalled on a pin that forms an extension of the cap and is rivetted over
at its outer end to keep the shackle in place whilst permitting it to turn freely on
the pin.
In another construction the ends of a discontinuous shackle ring are mounted
to turn in a boss about an axis at right angles to the axis of the pin on which the
boss is mounted to turn, the whole forming a double swivel or universal joint.
The pin in each case may be made separate from and secured to the cap
by screwing rivetting or soldering or by screw and rivetting or soldering, in
which case it may be made with a head to retain the boss or central portion of
the shackle in place end ways, instead of rivetting over the end of the pin for this
purpose.
In each case, the removable cap, which may be provided internally with a
packing piece can be screwed on or off the stem of the air valve without any
tendency for the attaching chain to become twisted or interfering with its
motion.
The combined screw cap and swivel shackle may be slightly modified in
CCDstruction to adapt it to other kinds of inflatable articles where air valves are
required having removable screw caps attached by chains to fixed points.
Dand
T1000

page_text: Improvements in Detachable Caps for Air Valves, suitable for
Pneumatic Tyres and other Inflatable Articles.
A communication from abroad by GEORGE BADENOCH DOHERTY, late of
Chowringee, Calcutta, in the Empire of India, but now of 10 Middleton
Row, Calcutta aforesaid, Engineer.
I, DAVID DOHERTY, of 12, Moss Street, Garston, near Liverpool, in the
County of Lancaster, Architect, 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 this invention is to enable the removable cap of an air-valve for
a pneumatic tyre to be connected to one of the spokes of a cycle-wheel by a
chain in such a manner that it can be screwed or unscrewed without necessarily
turning the chain. Hitherto the removable caps of air-valves for cycle-tyres
have been made to terminate in a button-shaped head, the shank of which is
encircled by closing around it one of the links of an ordinary attaching chain,
the other end of which is similarly connected to one of the wheel-spokes. In
practice this mode of connecting the removable cap to the wheel is such that the
cap cannot be freely screwed on or off the air-valve and the attaching chain is
liable to become twisted to such an extent as to cause the links to open sufficiently
to allow them to become uncoupled from the cap, with the result that the cap is
very liable to be lost.
Now this invention. has for object to, obviate this disadvantage, for which
purpose I provide the extended closed end of the removable cap with a swivel-
shackle so that the cap can be turned independently of the chain to which the
shackle is connected.
One construction of this kind is represented by Figs. 1 and 2 of the accom-
panying drawings, which show enlarged sections thereof at right angles to each
other, Fig. 1 showing the cap 1 in position on the stem 2 of a cycle-tyre air-valve
of well known form and having its shackle 3 connected by a chain 4 with one of
the spokes 5 of the wheel to which the air-valve is applied. The shackle 3 is in
this case formed with a boss 6 which is journaled on a pin 7 that forms an
extension of the cap 1 and is riveted over at its outer end 8 to keep the shackle in
place whilst permitting it to turn freely on the pin.
In another construction shown in section and elevation respectively in Figs. 3
and 4, the ends of a discontinuous shackle-ring 3* are mounted to turn in a boss 6*
about au axis at right angles to the axis of the pin 7 on which the boss is mounted
to turn, the whole forming a double swivel or universal joint.
The pin in each case may be made separate from and secured to the cap by
screwing, riveting or soldering or by screwing and riveting or soldering, in which
case it may be made with a head to retain the boss or central portion of the
shackle in place end ways, instead of riveting over the end of the pin for this
purpose. In the example represented in, Figs., 3, 4, and 2^, a separate pin. 7ª
provided with
head 7 is secured into the cap 1 by means of a screw threaded
end portion 7, the extremity of which is riveted down on the cap to prevent the
latter from working loose.
In each case the movable cap, which may be provided internally with a packing
piece 9, can be screwed on or off the stem 2 of the air-valve without any tendency
for the attaching chain 4 to become twisted or to interfere with its motion.
The combined screw-cap and swivel-shackle may be slightly modified in

page_text: construction to adapt it to other kinds of inflatable articles where air-valves are
required having removable screw-caps attached by chains to fixed points.
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 :-
1. A detachable cap for an air-valve, having its closed end provided with a
swivel-shackle so that the cap can be turned independently of an attaching chain
secured to its shackle, substantially as hereinbefore described.
2. My improved detachable air-valve caps constructed, arranged, and operating
as hereinbefore described with reference respectively to and shown in Figs. 1, 2,
and 24 and in Figs. 3 and 4.