Improvements in or relating to Valves.
Year: 1895

page_text: Date of Application, 24th Apr., 1895
Complete Specification Left, 24th Jan., 1896-Accepted, 29th Feb., 1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Valves.
I, PAUL GIFFARD, of 7 Rue Delabordé, Paris in the Republic of France do
hereby declare the nature of this invention to be as follows:-
This invention relates to valves for various purposes but I will describe it as
applied to a pump for air or gas, and as applied to a pneumatic tyre for cycles.
When applied to a pump the construction may be as follows;-
A short distance in the pump cylinder, is placed a disc or diaphragm having one
or more openings or perforations and having the face remote from the piston of a
concave formation; against this plays the valve, which it is preferred to make in
the form of a solid or hollow cylinder, the edges of which engage with the concave
face of the diaphragm, thus making a tight contact upon the knife-edge principle.
Behind the valve it is preferred to have a helical or other spring so as to retain the
valve normally upon its seat; the spring may be retained in position and tension by
a cap screwing into the end of the cylinder, its position being if necessary,
adjustable, though it is preferred to screw it rigidly into the cylinder, a flange
upon the cap engaging and forming a tight joint with the end of the cylinder.
The cap may be recessed or hollowed upon the inside of the cylinder to receive the
before mentioned spring. Upon the outside the cap may be provided with a
screwed nipple to engage with a corresponding socket upon the tube or vessel into
which the fluid is to be discharged.
Various materials may be employed for these valves but rubber is found to give
good results and for the diaphragm which constitutes the valve-seat pure tin may
be used, though I do not bind myself to the use of any special materials.
Where the vessel into which the pump discharges, has to retain the air or fluid,
a back pressure valve must be provided through which the air can be forced into
the vessel, but cannot return. This valve is substantially the same as that already
described in connection with the pump, but for convenience in its application, parts
of it may be modified. For example, instead of a concave diaphragm, and a flat-
faced valve, it is sometimes convenient to make the diaphragm flat and the valve
concave the spring acting upon the valve as before, but it may be advantageous in
this case, to make the valve of metal and the diaphragm or seating of rubber or
other suitable material. The valve may be formed with a tube or valve-body (in
the case of the pump, this is provided by the pump cylinder) which may be secured
to the vessel to be charged. For example, suppose the vessel to be charged, he a
pneumatic cycle tyre this valve-body may be provided with an enlarged head which
may be passed through to the inside of the air-tube and the body being screwed
externally can then be provided with a washer and nut between which and the head
the rubber of the air-tube can be securely gripped, the body passing through the
rim of the wheel, and being secured by another nut in the usual manner. The end
of the valve body may be screwed internally or externally to receive the pump
nipple or connection and various materials may be employed in the manufacture as
explained in the case of the pump.
The indiarubber or other scat may fit up against a concave. copper or other
bushing which may screw into the valve-body so as to provide an abutment to keep
the valve and its seating in their proper places. If desired, however, this arrange-
ment may be reversed and the valve would then be the same as previously

page_text: described in reference to the pump, and similarly the construction of the pump
valve may be reversed.
It is sometimes desirable to make the valve-body in two or more parts; this
may be effected by placing the head, the washer, and one or both of the nuts,
upon one portion of the body and the valve proper in another portion, the two
portions being adapted to screw together in any convenient manner. A pin or
extension of the valve or other device may be provided for deflating purposes.
Dated this 23rd day of April 1895.
BOULT & WADE,
Agents for the Applicant.
I, PAUL GIFFARD of 7 Rue Delaborde, Paris in the Republic of France 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 various purposes but I will describe it as
applied to a pump for air or gas, and as applied to a pneumatic tyre for cycles.
The invention will be best understood by reference to the accompanying
drawings in which
Fig. 1 is a section of the lower part of the pump and
Fig. 2 is a section of a pneumatic tyre valve both constructed according to this
invention.
Like letters indicate like parts throughout the drawings.
When applied to a pump the construction may be as follows;-
To the lower end of the pump barrel A as shown in Fig. 1, I may screw or
otherwise secure the valve casing B whose upper end if desired may be formed as
a screwed nipple B₁ serving for connecting together the two parts A and B.
The valve casing B may be regarded as an extension of the barrel A and the
screwed nipple B₁ may be regarded as a diaphragm as which it is hereinafter
referred to. This diaphragm has one or more openings B' extending through it
and has the face B³ remote from the pump piston C of concave form. Against the
face B³, which is hereinafter referred to as a valve seat, plays the valve D, which it
is preferred to make in the form of a solid or hollow cylinder, the edge of which,
the upper one as shown in Fig. 1, engages with the concave valve seat B³, thus
making a tight contact upon the knife-edge principle. Bebind the valve D it is
preferred to have a spring E so as to retain the valve normally upon its seat; the
spring E may be retained in position and tension by a plug F screwing into the
end of the valve casing B, its position being if necessary adjustable though it is
preferred as shown in Fig. 1 to screw it rigidly into the casing B, a flange F
upon
the cap engaging and forming a tight joint with the end of the cylinder. The
plug may be recessed or hollowed upon the inside of the cylinder as at F' to receive
the spring E. Upon the outside, the cap F may be provided with a screwed
nipple F to engage with a corresponding socket upon the tube or vessel into which
the fluid is to be discharged.
Various materials may be employed for the valve D and valve seat B³ but
rubber is found to give good results for the valve and for the valve-seat, metal
preferably pure tin may be used, though I do not bind myself to the use of any
special materials.
Where the vessel into which the pump discharges has to retain the air or fluid,
a back pressure valve must be provided through which the air can be forced into
the vessel, but cannot return. This valve is substantially the same as that already

page_text: described in connection with the pump, but for convenience in its application, parts
of it may be modified. For example, instead of a concave valve seat and a flat-
faced valve, as previously described, it is sometimes convenient as shown in Fig. 2.
to make the valve-seat flat and the valve D concave, the spring E acting upon the
valve as before, but it may be advantageous in this case, to make the valve of metal
and the valve seat of rubber or other suitable material. The valve casing B is
shaped as best suited for application to the vessel to be charged, for example,.
suppose the vessel to be charged be a pneumatic cycle tyre this valve casing B as.
shown in Fig. 2 may be provided with an enlarged head B which may be passed
through to the inside of the air-tube and the casing being screwed externally as.
at B can then be provided with a washer and nut between which and the head B⭑
the rubber of the air-tube can be securely gripped, the body passing through the
rim of the wheel, and being secured by another nut in the usual manner. The end
of the valve body A may be screwed internally to receive a plug G itself screwed
externally as shown or internally to receive the pump-connection or nipple, and
various materials may be employed in the manufacture, as explained in the case-
of the pump.
The valve seat B³ in the example illustrated in Fig. 2 is formed on or by an
india rubber ring encircling a nipple or tubular projection G on the inner end of
the plug G. This ring is held in position between the annular shoulders B
and G on respectively the valve casing B and plug G, and is compressed between
said shoulders so as to make tight joints therewith, and the portion of the valve-
casing wall immediately surrounding the ring is preferably formed conical so as to
further compress the ring and ensure that it shall make a tight-joint with said.
.wall.
If desired the valve seat B shown in Fig. 1 may be flat and the face of the
valve D therefor concave and the valve seat B3 shown in Fig. 2 may be concave-
and the face of the valve D therefor flat.
It is sometimes desirable to make the valve-body in two or more parts; this may
be effected by placing the head, the washer, and one or both of the nuts upon one
portion of the body and the valve proper in another portion, the two portions being
adapted to screw together in any convenient manner. A pin or extension of the
valve or other device may be provided for deflating purposes.
Having now particularly described and ascertained the nature of the said inven--
tion and in what manner the same is to be performed I declare that what [
claim is ;-
1. In a valve the employment of a concave valve seat substantially as described.
and illustrated in Figure 1 of the accompanying drawings.
2. The combination with a concave valve seat of a valve such as D substantially
as described and illustrated in Fig. 1 of the accompanying drawings.
3. The employment of a cylindrical valve such as D having its operative end
formed concave substantially as described and illustrated in Figure 2 of the
accompanying drawings.
4. The combination and arrangement of parts constructing the complete valve.
substantially as described and illustrated in Figure 1 of the accompanying.
drawings.
5. The combination and arrangement of parts constructing the complete valve
substantially as described and illustrated in Figure 2 of the accompanying.
drawings.
Tul 1.
ST1006
BOULT & WADE,
Agents for the Applicant..