Improvements in Valves for Pneumatic Tyres and other Inflatable Articles.
Year: 1897

page_text: Date of Application, 31st July, 1897
Complete Specification Left, 30th Apr., 1898-Accepted, 9th July, 1898
PROVISIONAL SPECIFICATION.
Improvements in Valves for Pneumatic Tyres and other Inflatable
Articles.
I, THOMAS EDWARD SILVESTER, of No. 8, Church Street, in the City of Birming-
ham, Solicitor, do hereby declare the nature of this invention to be as follows:-
The object of my invention is to minimise the leakage which usually takes place
in most valves, and to accomplish this I construct the valves in the following
manner, I insert in the tube and through the rim of the wheel or in a correspond-
ing position in any other article a metal tube or shell at one end of which is the
seating for the stop for shutting in the air after pumping. This stop consists of
a guide piece passing through the body of the valve, which body is attached to
the shell. The guide piece carrying at its extremity a pad of india rubber or other
suitable material, the other end of this guide piece is pivotted to a lever or levers
which are carried on a trunnion-nut which is actuated by a screwed-shaft working
at right angles to the guide so that by the turning of the shaft a vertical motion
is given to the guide, and the pad is thus brought up to its seating in a direct
line without any screw motion against the face of the seat. For the purposes of
pumping I employ the ordinary check valve.
The guide piece may be actuated by a push piece bearing on or attached to
the levers, in place of the screwed shaft, or any other suitable mechanical arrange-
ment may be employed, which will give to the guide piece a direct motion in a
straight line instead of a screw or twist motion; which it is my object to avoid.
When applying this invention to tyres or other articles composed of more than
one inflatable chamber all the chambers will be simultaneously acted upon and
independently shut off by constructing holes in or near the seating leading into
metal tubes giving independent communication with each chamber. Thus with
the employment of a single valve constructed on this principle the pad when
brought up to its seating closes all the chambers and injury to one will not effect
the others.
A reverse action upon the mechanism actuating the padded guide piece deflates
the air chamber or in case of more than one deflates them simultaneously.
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page_text: the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
The object of my invention is to minimise the leakage which usually takes place
in most valves.
Referring to the accompanying sheet of drawings, drawn to an enlarged scale,
to assist in the description of my method of accomplishing this object;
Fig. 1 is a sectional view of one of my valves shewing in elevation the interior
mechanism when the valve is opened to allow of the free passage of the air to or
from the article to be inflated;
And Fig. 2 is a similar section shewing in elevation the position of the same
mechanism when the valve is closed.
Similar letters on the drawings refer to similar parts.
I insert in the tube to be inflated, and through the rim of the wheel when
applying the valve to a cycle tube, or in a corresponding position in any other
article, a metal tube or shell A having a seating B for the stop which is for
shutting in the air after pumping. This stop consists of a guide piece C passing
through the body of the valve D at E and down the shell or tube A but fitting
loosely to allow passage of air from E to B. The body D of the valve is attached
to the shell A at F. This guide piece C carries at its extremity a pad G of india
rubber or other suitable material, to the end of this guide piece Ĉ is pivotted a
lever or levers H which are carried on a trunnion nut I upon and actuated by a
screwed shaft J working at right angles to the guide C and being held in position
by the screw piece M bearing upon its collar L, so that by turning the screwed
shaft J by means of the head piece K the trunnion nut I travels on the screw thread,
and a forward movement is given to the guide piece C and the pad G is thus
brought up to its seating B as shewn in Fig. 2 in a direct line without any screw
motion against the face of the seating B.
The guide piece C may be actuated by a push piece bearing on or attached to
levers in place of the screwed shaft J. Or any other suitable mechanical arrange-
ment may be employed which will give to the guide piece a direct motion in a
straight line, instead of a screw or twist motion which it is my object to avoid.
For the purposes of pumping I employ the ordinary check valve N.
When applying this valve to tyres (or other articles) composed of more than
one inflatable chamber, all the chambers will be simultaneously acted upon and
independently shut off by constructing in addition to the central hole O other
holes P, P, opening into the seating B in front of the pad G and leading into tubes
to be attached at their outlets R, thus giving independent communication to each
inflatable chamber. Thus by the employment of a single valve constructed on
this principle the pad G when brought up to its seating B closes all the chambers
independently and injury to one will not affect the others.
A reverse action upon the mechanism actuating the padded guide piece C deflates
the air chamber or in the case of more than one, deflates them simultaneously by
bringing the mechanism back into the position shewn in Fig. 1.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:
(1) In valves for pneumatic tyres and other inflatable articles the construction
and arrangement of the mechanism for opening and closing the valve substantially
as herein described and illustrated for the purpose of giving the guide piece Cor
its equivalent a direct motion in a straight line.
(2) In valves for pneumatic tyres and other inflatable articles the guide piece C,
lever H, and screwed shaft J working in combination for the purpose of causing
the stop piece or pad G to close the air passage O by a direct pressure instead of
with a screw motion.
(3) In valves for pneumatic tyres and other inflatable articles the employment

page_text: of mechanism giving to the guide piece a direct motion in a straight line instead
of a screw or twist motion when causing the pad to bear upon the air passage.
(4) When applying valves to pneumatic tyres or other articles having more than
one inflatable chamber constructing a valve so that by the use of one guide piece
the ducts to all the chambers shall by it be simultaneously closed independently,
of one another.
HENRY F. TALBOT,
30, Temple Street, Birmingham, Agent for the Applicant.