Improvements in Valves for Pneumatic Tyres, principally for Common Road Vehicles.
Year: 1898

page_text: Improvements in Valves for Pneumatic Tyres, principally for
Common Road Vehicles.
I, CHARLES THOMAS BROCK SANGSTER, Works Manager to The Cycle-Components
Manufacturing Company Limited of Bournbrook, near the City of Birmingham,
do hereby declare the nature of this invention to be as follows:-
-
This invention relates to valves for pneumatic tyres, principally to be used on
common road vehicles, and has for its object, to provide a simple and efficient valve.
The improved construction of valve consists of a hollow tubular body part, out-
side screwed to receive the usual clamping and locking nuts and having vertically
sliding within it a valve stalk, prevented from rotating by a pin or snug upon it,
engaging within a longitudinal slot in the bore of the body, whilst the conical head
is surmounted by a rubber disc valve, formed with a boxed cap upon the underside
having overhanging edges and adapted, when stretched, to be sprung over the head
of the valve stem, whose lower end, which normally lies within the tail end of the
valve body, is fitted with a washer or nut, sliding with a preferably enlarged part
of the bore of the body, between which and an annular shoulder or choke within the
said bore, a coil spring surrounding the stalk, is disposed and is adapted to draw
the disc valve down upon its seating, which consists of an expanded or flanged and
slightly sunken top of the body, with the entrance to the bore bell-mouthed or she
coned, upon the sides of which the cap part of the valve disc seats itself whilst the
disc itself lies within the flap of the sinking. The circular flanged head end of the
body forms a shoulder, for nipping the tyre between itself and a D-pierced washer,
threaded over the valve body, and having a teat upon it which engages with a cor-
responding formation on the rim, so as to prevent the valve and assembled parts
carried by it, from rotating.
The dust cap preferably has a sunken middle fitted with a rubber or yielding pad
having a central plug or closure adapted to take into and close the mouth of the
body, so as to prevent leakage of air.
To deflate a tyre, the stalk is pushed upwards by a suitable instrument, thereby
lifting the valve disc off its seating and admitting of the escape of air, whilst the
valve is closed by the inside air pressure, assisted by the expanding force of the
auxiliary spring which was compressed by the lifting of the stem.
As a modification, the sunken top of the body and the valve disc lying therein
may be dispensed with whilst the she coned seating is extended and receives the
he-coned rubber walls of a box-like cap sprung over the conical head of the valve
stem, and instead of the dust cap having a resilient closure pad, as described it
may have a metal boss adapted to take into the mouth of the valve body and having
a central clearance which takes over the end of the stem thereby avoiding the
lifting of the same and consequent deflation on the screwing home of the cap.
Dated this 4th day of January 1898.

page_text: Improvements in Valves for Pneumatic Tyres, principally for
Common Road Vehicles.
I, CHARLES THOMAS BROCK SANGSTER, Works Manager to The Cycle Components
Manufacturing Company, Limited, of Bournbrook, near the City of Birmingham,
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 relates to valves for pneumatic tyres, principally to be used on
common road vehicles, and has for its object, to provide a simple and efficient valve.
Figure 1 of the accompanying drawing represents a vertical section of a valve
for carriage tyres constructed according to one form of my invention.
Figure 2 is a cross section of the same upon the dotted line a¹, Figure 1.
Figure 3 is another cross section thereof on the dotted line.
Figure 4 represents the detail component parts of the valve separated or
dis-assembled.
The same letters of reference indicate corresponding parts in the several figures of
the drawings.
The improved construction of valve consists of a hollow tubular body part a,
outside screwed to receive the usual clamping and locking nuts b, c, and having ver-
tically sliding within it a valve stalk d, prevented from rotating by a pin, snug or
other projection d', upon it, engaging within one or other of a series of longitudinal
slots, made through a contraction of the bore a², of the body whilst the conical
head, of the said stalk is surmounted by a rubber valve facing e, made in the form of
a conical sided boxed cap ¹, the walls of which are adapted, when stretched, to be
sprung over the head of the valve stem whereby the attachment of the one part to
the other is effected without the aid of cementation or mechanical means. The
lower end of the said stem or stalk normally lies within the tail end of the valve
body, and is fitted with a screwed-on washer nut f, fitting and sliding within a
preferably enlarged part a³, of the bore of the body, and thus forming a guide
for preventing the rocking of the stem when in position, whilst between the said
washer and the annular shoulder or choke a², within the said bore, a coil spring g,
surrounding the stalk, is disposed and is adapted to act against the washer
and thus draw the disc valve down upon the conical seating a³, formed in the
inner side of the expanded or flanged head or top as, of the body.
If necessary I may dispense with the auxiliary spring and rely only upon the
internal air pressure upon the face of the valve cap for keeping the same up to
its seating in the head.
The circular flanged head end of the body forms a shoulder, for
nipping the tyre between itself and a D-pierced washer h, threaded
over the valve body and preferably having a teat upon it which engages
with a corresponding formation on the rim, so as to prevent the valve body and the
assembled parts carried by it, from rotating.
The dust cap i, has a middle plug i, adapted to take into the mouth of the en-
larged part of the bore of the body part whilst the inside screwed sinking ², of it is
adapted to take upon the wormed outer end of the non-rotating valve stalk and
when screwed home to draw the faced end of the said valve up to its seating and
thus prevent the leakage of air. By the employment of this form of cap, the lifting
of the stalk on the application of the dust-cap, and the consequent escape of air, is
obviated.
To deflate a tyre, the stalk is pushed inwards or upwards, against the face of it

page_text: spring, by means of a suitable instrument, thereby lifting the conical rubber valve
off its seating and admitting of the escape of air, whilst the valve is closed by the
inside air pressure, acting against the enlarged end of the rubber
assisted by the expanding force of the auxiliary spring which was compressed by
the lifting of the stem.
cap,
The removal of the nut washer f, from the stalk to admit of the parts being dis-
assembled can be effected by means of a suitable forked key or instrument engaging
over the flat edges thereof.
Figure 5 represents a modification of my invention in which the enlarged head or
top a6, of the body is sunken at a', to receive a rubber valve disc e², (shown separately
in Figure 7) forming an integral part of the rubber cap e, sprung as before onto the
conical inner end da, of the valve stalk d, and lying within the she coned seating as,
in the head. In this arrangement, the auxiliary closing spring is not employed.
Figure 6 represents a section of the modified form of dust cap which may be used
in connection with this valve. It has a central and inside screwed sinking i,
adapted to screw onto the outside wormed end of the valve body and having upon
the bottom of it, a rubber pad 3, with a middle plug or thickening 3, adapted to
take into and close the open end of the valve stalk and thus prevent air leakage.
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
First: In an inflating or check valve, principally to be used in connection with
the tyres of road carriages, forming the rubber valve facing in the form of an
clastic cap adapted to spring over the end, or the enlarged end of a valve stalk,
whereby the attachment of the one part to the other is effected without cementation
or mechanical means substantially as described and set forth.
be used
Secondly-An inflating or check valves, principally to
connection with the tyres of road carriages, consisting of a hollow body part,
having a valve-seated head at the inner end and an internal shoulder or throttling
of the bore, and a sliding valve stalk, the tail end of which is fitted with a guide
washer, which keeps the valve central and forms also a lower abutment for an
auxiliary closing spring located between it and the aforesaid internal throttling of
the bore, whilst the rotation of the stalk within the body is prevented by a key or
projection on the one part engaging within a key-way or slot in the other part.
Thirdly:—In inflating valves of the type referred to in the preceding claims,
providing the contraction of the bore of the body part with a series of key-ways or
slots adapted to receive one or more keys or projections on the sliding element of
the valve, substantially as described and set forth.
Fourthly A dust cap for tyre valves, the closure plug of which is adapted to
take within the open end of the valve body and to screw upon the wormed end of a
non-rotating but sliding valve stem, the facing of which is thereby drawn onto its
seating, substantially as described and set forth.
Doted this 30th day of September 1898.
CHARLES THOMAS BROCK SANGSTER,
By Henry Skerrett,
24, Temple Row, Birmingham. Agent for Applicant.