Improvements in Valves for Pneumatio Tires and the like.
Year: 1896

page_text: Date of Application, 30th Dec., 1896
Complete Specification Left, 21st June, 1897-Accepted, 28th Aug., 1897 -
PROVISIONAL SPECIFICATION.
Improvements in Valves for Pneumatio Tires and the like.
I, CHARLES CHALMERS FONTAINE, of 95, Holland Road, Brixton, London, S.W.
Gentleman, do liereby declare the nature of this invention to be as follows:-
This invention relates to improvements in valves for pneumatic tires and the
like, and has for its object to provide another simple or improved means whereby
an air-tight join, or combination of joins may be made with a screwed cap on the
exterior end of the valve stem, thereby preventing any escape of air without
depending on the perfect fitness of any other part.
In carrying out my invention the stem of the valve is threaded outside to carry
the necessary nuts and cap, and is attached to the tire in the usual manner.
The interior end of the stem is provided with a head on which I employ a non-
return valve to prevent the air escaping while the pump is applied.
This invention relates especially to the exterior end of the valve stem which I
smooth down equally or tapering a short distance up, and of smaller diameter than
the threaded portion of the stem.
I then make a special cavity in the extremity of the cap to receive this part of
the stem, in that part of the cavity nearest the threaded portion of the cap. I form
ribs or projections making points of contact with as little bearing surface as
possible, to adapt themselves to that portion of the stem, in the bottom of this
cavity I employ packing of such a nature that will adapt itself to any irregularities
that might be on the stem when the cap is being screwed on, thereby making a
combination of all these joins.
Underneath aforesaid packing I may use a material of a more springy or spongy
substance that will force the packing back, or retain its original shape after
compression by releasing the cap.
000
CHARLES CHALMERS FONTAINE,
95, Holland Road, Brixton, S.W.
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the like.
I, CHARLES CHALMERS FONTAINE of 95, Holland Road, Brixton, Gentleman, 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 improvements in valves for pneumatic tyres, and has
for its object to provide a simple arrangement of cap or closing device by which

page_text: a thoroughly air-tight joint may be obtained without relying on the other part
of the valve, and also to secure the cap in an improved manner.
In carrying out my invention the outer end of the stem of the valve is mado
of slightly tapering form, and of smaller diameter than the threaded part. The
cap is formed with a small special cavity to receive this part of the stem and
into the cavity close to the threaded part ribs or projections are formed, which
are adapted to bear upon the tapering face of the stem. These ribs make the
points of contact or joints with as little bearing surface as possible. lu the
bottom of the cavity packing is placed of a kind which will adapt itself to any
irregularities that may be on the stem. When the cap is screwed in place, the
packing is in two parts, the portion bearing upon the end of the stem being preferably
of harder material behind which is placed a small plug of spring or spongy substance.
This allows the packing to be pressed back when the cap is screwed down, which
ensures its keeping a proper position when released from compression. The rib
next to the packing serves to keep it in place, also allowing only a small part of the
pressure of the cap to be taken by the packing. This arrangement prevents it
getting out of shape or otherwise damaged or lost. The ribs also ensure a
permanent fastening, preventing any danger of the cap shifting upon the stem.
The arrangement I employ for holding the cap when unscrewed consists of a pin
which engages with a projection on the end of the cap. The arrangement I propose
to employ for holding the cap is formed from two parts one part being formed with
a perforation or loop engaging with the projection on the cap: The other end of
this part. is preferably slotted allowing the other portion which consists of a pin
having a small head to pass through. The other end of this pin may be attached
to a washer on the stem or may be connected to a second pin on which it is allowed
to slide, this pin being fitted to the stem. In the latter case the second part may
be dispensed with, and the pin bent round to engage with the projection on the
cap.
In order that the invention may be more olearly understood, reference is had to
the accompanying sheet of drawings, in which Fig. 1 is a side elevation of a valve
constructed according to my invention, Fig. 2 is a section of a slightly modified
arrangement, Figs. 3 and 4 are detail views, Fig. 5 is a section of a cap, Fig. 6 a
modification of the packing, and Fig. 7 shows a slightly modified arrangement, and
Fig. 8 shows a modification with an internal screwed stem, and. Fig. 9 is a modifica-
tion of the non-return valve.
The cap is formed in two main parts A and A¹; the latter being external to the
former and provided with an internal screw thread at its lower end. This cap
screwed on to the stem B, the upper ond b of which is made smooth and preferably
slightly tapering. The cap A is provided with the small ribs a which are adapted
to bear upon the conical surface of the stem the ribs being circular and bearing
evenly all round. Inside the cap packing is placed consisting of the outer part C
and the packing or plug c of softer and springy material, allowing. the packing to
give so as to form a tight joint.
To the projection or head a¹ on the cap as shown in Fig. 1, the small plate D
shown in detail in Fig. 3 is fitted, this plate being perforated to allow the head to
pass through. The other end of the plate which is preferably curved is formed with
the slot d allowing the pin E to pass through. This pin is furnished with the lead e
which prevents its becoming disengaged from the plate E and it is secured at the
other end of the washer F screwed on the stem. This arrangement allows the
cap to be readily screwed or unscrewed, but at the same time prevents it becoming
entirely detached and getting lost, or engaging with the spokes.
As shown in Fig. 2 the pin E is bent round at el so as to form a loop engaging
with the head on the cap. The other end of this pin is also bent round into a small
loop engaging with the second pin G which is secured to the stem of the valve, and
is fixed in place when the washer F is screwed against the rim. The two pins
engage with each other in the manner showa so that they are allowed to slide or
télescope, enabling the cap to be operated in the desired manner.

page_text: The lower or inner part of the valve is formed with the small box H which is
perforated in any convenient manner. Within this box the plug h of peculiar form
is placed, this plug being conical or tapering to a sharp point, and the sides curved
towards the point, and the base h¹ formed as shown in Fig 4. As shown in Fig. 9
the vent 2 in the stem is carried a short distance into the case and a plate of
metal 3 of the same shape, in plan, as Fig. 4 covers the end of the vent. This plug
or plate prevents the air escaping from the tyre when the valve is opened as the
pressure at the back causes it to close the extremity of the vent in the stem, but
when the valve has been properly closed by the cap the pressure of air within the
same will gradually, owing to a slight leakage, become equal to the pressure in the
tyre, and the plug or plate on account of equal pressure all round and also having
little bearing surface against the stem will then drop. To deflate the tyre
the cap is partly unscrewed allowing the air to escape in a gradual manner.
Any sudden release of the air will immediately cause the plug to rise and close
the aperture.
As shown in Fig. 6 instead of employing the soft part c of the packing the
spring c is used, bearing on the packing C. The spring is preferably of the
ordinary spiral kind.
The arrangement shown in Fig. 7 is a slight modification of the stem, the tapering
end of B being formed with the grooves b¹, one, two, or more of which are employed.
These serve to receive and hold the packing 62 which is placed round this tapering
part. The packing may also be provided inside the cap in the manner above
described. As shown in Fig. 8, the stem B¹ is provided with an internal screw
thread and the cap or cover I is formed with a central screwed pin i taking into the
end of the stem. Packing is placed in the capped end around the central pin
closing the end of the stem and making an air-tight joint. These modifications are
especially intended for use with valves of large size, such as those which may be
used with tyres intended for cabs, motor cars and other vehicles.
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) Improvements in the construction of valves for pneumatic tyres and the like,
the combination of a cap adapted to be screwed on the stem of the valve, and
annular ribs adapted to bear on the smooth surface of the same, of packing placed
within the cup, consisting of surface pieces of harder material and hacking of more
resilient and softer materials, substantially as and for the purposes specified.
(2) In valves of pneumatic tyres and the like, the combination with annular rings
at the inside of the cap bearing on the end of the stem, of packing placed in the
bottom of the cap cousisting of a facing piece of soft material bearing on the
extremity of the stem, of a small spring at the back of the packing, substantially as
and for the purposes specified.
(3) In valves for pneumatic tyres and the like, a securing device for the caps,
consisting of a pin secured to a part of the valve, and a sliding piece attached to
the said pin and secured to a head on the cap of the valve, substantially as and
for the purposes specified.
(4) In valves for pneumatic tyres and the like, the securing device for the caps
consisting of a pin secured to the washer fitted on the stem, and a small slotted
plate adapted to slide on the said pin and connected to a head on the cap
substantially as described and shown in Fig. 1 and for the purposes specified.
(5) In valves for pneumatic tyres and the like, a device for securing the cap
consisting of a pin secured to the stem of the valve, a second pin engaging with
the first by means of loops, of sliding or telescoping upon it, and a loop or eye at
the end of the second pin, engaging with a head on the cap, substantially as described
and shown in Fig. 2and for the purposes specified.
(6) Improvements in valves for pneumatic tyres and the like, consisting in tapering

page_text: and smothing the end of the stem, and in forming the same with an annular groove
or grooves adapted to receive annular strips of packing, substantially as described
and shown in Fig. 7.
(7) In valves for pneumatic tyres and the like, the combination with a stem having
a tapering end and a rap screwing on the said stem, with annular ribs bearing on the
tapering portion, of a box at the inner end of the valve stem, loosely encasing a
non-return valve constructed substantially as described and shown in the accom-
panying drawings, and for the purposes specified.
Dated this 17th day of June 1897
GEO. H. RAYNER,
37, Chancery Lane, London, Agont for the Applicant.