Improvements in Valves, specially applicable to Pneumatic Tyres.
Year: 1896

page_text: Date of Application, 7th May. 1896-Accepted, 20th June, 1896
COMPLETE SPECIFICATION.
Improvements in Valves, specially applicable to Pneumatic Tyres.
I, JAMES YATE JOHNSON of 115 St. Vincent Street Glasgow in the County of
the City of Glasgow, Chartered Patent Agent (a communication from abroad
by Redway Manufacturing Co., 44 Broadway, New York U.S.A.) 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 invention relates more particularly to valves for use on pneumatic tires
that are used on bicycles, sulkys and other vehicles and has for its object, to
provide improved means to permit air to be pumped into the tire and to prevent
the escape or leakage of air through the valve. The improved valve herein
described may be applied to other devices than pneumatic tires and while
describing herein that particular application of the invention, it is not limited
to such use.
The invention consists in the novel details of improvement and the combinations
of parts that will be more fully hereinafter set forth and then pointed out in the
claims.
Referring to the accompanying drawings which form a part of this specification:-
Figure 1 is a vertical cross section of the improved valve shown in position on a
tubular tire, the parts being in position to permit air to be pumped into the tire.
Figure 2 is a similar section, showing the valve closed to prevent the egress of
air from the tire through the valve.
In the drawing, the letter A indicates a suitable inflatable tire adapted to
receive and retain air under pressure. B is the main body portion of the valve
mechanism, being shown of tubular form, open at both ends, and provided with
external threads a, and a flange b near the end that engages the tire A. The
body B is adapted to pass into an opening c in tire A so that the flange b will
engage the inner wall of said tire at said opening as shown. d is a washer
or flange placed upon the body B and adapted to rest upon the part e of
tire A. whereby the latter part may be clamped between flange b and washer d.
f is a nut or the like working upon threaded portion a of body B and arranged
to press upon washer d to force it against tire A as shown. By the above
means the body B can be firmly secured to the flexible tire, making an air
tight joint but the body B can be otherwise suitably attached to the tire if
desired.
D is a valve located in tubular body B and having free longitudinal motion
therein, an internal abutment g in body B preventing the valve passing through the
lower end of said body. O are openings in the side of the body B to permit entrance
of the air. The valve D is shown in disk form, and provided with a stem D² that
projects beyond body B and is provided at its outer end with screw threads to
receive a crap E, as hereinafter explained. The stem D2 is also shown provided with
a groove D³ for the passage of air. The stem D2 is preferably tapered from the
valve D outwardly for a distance as shown.
F is a tube adapted to receive the stem D2 of valve D and it is provided with a
flange i and nipple extension j upon which a packing tube G of rubber or other
suitable material is placed, the lower end of said packing G passing snugly into
body B so that valve D can abut against it, as shown. The nipple extension j is
preferably oval or curved on its exterior so as to cause the packing G at j² to swell

page_text: out at its upper part to make an overlapping tight junction with the body B. The
stem D passes freely through the tube F as indicated in the drawing to permit
the passage of air.
H is an internally threaded sleeve adapted to work upon threads a of body B and
it is provided with an internal flange 1 that bears upon flange i of tube F so as to
hold the latter and packing G upon body B as shown. By forcing down sleeve H
the packing G will be expanded at the part and forced against the end of body B
to form a tight fit therewith.
K is a coupling or sleeve adapted to fit on tube F and to be connected with a tube
or the like K (see Figure 1) that may lead from a suitable air pump.
The operation is as follows:-When the air is not compressed in tire A,
valve D will be free to move and may rest upon abutment 9 in body B. Air
being now forced into the tire, it will pass through tube F, packing G, body B
and around stem D2 and valve D, until it is sufficiently compressed to sustain
valve D whereupon the latter will be pressed against packing G as in Figure 1.
A continued forcing in of air causes valve D to descend at each stroke of the
pump, and the back pressure of the air presses it against the packing G. By this
means during the back stroke of the pump air is prevented from escaping. The
tapering shape of the stem D' assists in quickly closing the passage through the
packing tube G, while at the same time permitting a proper passage of air into
tire A. The groove D³ in stem D also facilitates the passage of air along stem D
at its threaded portion, although this groove could be dispensed with. After the
tire A has been thoroughly inflated the sleeve K is removed, the valve D then
preventing the escape of the air being firmly held against backing G by the air
under compression. The cap E is next placed in position upon stem D, its
lower edge resting upon sleeve H where the cap finds a bearing. The thread E'
of cap E now engages thread h of stem D, and as cap E is turned, causes the
stem D and valve D to rise thereby pressing the valve firmly against tubular
packing G thus spreading the latter in body B and tightly closing any egress for
the air.
The device is simple in construction and therefore can be operated by the user
of the bicycle or vehicle without trouble. It is inexpensive to manufacture, not
liable to get out of order and effective in operation.
Having now particularly described and ascertained the nature of my said.
invention, and in what manner the same is to be performed, I declare that what
I claim is :-
1. The combination of the hollow body B, the tube F'formed with the nipple
extension j, the packing tube G fitting over the nipple extension forming a swell
which fits snugly against the body B, said packing tube extending into hody B,
means for securing tube F to body B, valve D supported in body B below
packing G and having a valve stem D2 extending through said packing, and
means for pressing the valve firmly against the packing, substantially as set
forth.
2. The combination of the hollow body B, the tube F formed with nipple
extension and annular flange i, the packing tube G fitting over the nipple
extension and against the flange i forming a swell which rests on end of body B,
means for securing tube F to body B, valve D supported in body B below packing
tube G and having a valve stem D' which latter extends through packing and
tube F and is formed with groove D³ a threaded portion on stem D and nut E
engaging said threaded end and adapted to force valve against packing substantially
as set forth.
Dated this foh do 1000
JOHNSONS,
115 St. Vincent Street, Glasgow, Applicant's Agents.