Improvements in Valves for Pneumatic Tyres.
Year: 1895

page_text: Date of Application, 29th June, 1895
Complete Specification Left, 14th Sept., 1895-Accepted, 19th Oct., 1895
PROVISIONAL SPECIFICATION.
Improvements in Valves for Pneumatic Tyres.
I, JABEZ CARTWRIGHT, Upper Bar Newport Salop, Cycle Agent do hereby
declare the nature of my said invention to be as follows:-
The object of my invention is improvements in valves for pneumatic tyres which
are very simple in construction reliable in use and very easily operated.
My valve consists of two parts and is usually made of metal such as brass or
other suitable material. The end which enters the rim and pneumatic tube is
secured at the inner end to the tube by a button. The outer end projects through
the rim of the wheel and is hollowed out or recessed and the external part screwed
so as to receive the lower or second portion. A rubber or leather washer may be
secured at the end to form a joint and this nipple or part has a central hole bored
through, communicating with the inside of the air tube. The lower portion or the
part to which the air pump is attached when the tube is to be inflated is hollowed
out to screw over the first nipple the end or bottom of which fits against the lower
end of the upper portion so as to form an air tight joint either by a cup turned
or by packing such as leather or rubber. Two holes are bored or made starting
near the outer edge of the bottom of this second portion and converge into one hole
at the nipple cud which fits into the pump. The effect is that when the two faces
are a little apart the air is at liberty to escape or to enter at the will of the person
operating the pump. When the tyre is sufficiently inflated the two faces are
brought together and as the holes in the two faces never come opposite to each
other a joint is made either by metal to metal or by a washer. I do not confine
myself to the faces as they may be cup and ball or flat or other effective shape.
Dated this 22nd day of July 1895.
GEORGE BARKER,
77 Colmore Row, Birmingham, Agent for Applicant.
Improvements in Valves for Pneumatic Tyres.
I, JABEZ CARTWRIGHT, Upper Bar, Newport, Salop, Cycle Agent do hereby
declare the nature of my said invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
The object of my invention is improvements in valves for pneumatic tyres which
are very simple in construction, reliable in use and very easily operated.
My valve consists of two parts and is usually made of metal such as brass or
other suitable material. The end which enters the rim and pneumatic tube is
secured at the inner end to the tube by a button. The outer end projects through
the rim of the wheel and is hollowed out or recessed and the external part screwed
so as to receive the lower or second portion. A rubber or leather washer may be
secured at the end to form a joint and this nipple or part has a central hole bored
[D1

page_text: through communicating with the inside of the air tube. The lower portion or the
part to which the air pump is attached when the tube is to be inflated is hollowed
out to screw over the first nipple the end or bottom of which fits against the lower
end of the upper portion so as to form an air-tight joint either by a cup turned or
by packing such as leather or rubber. Two holes are bored or made starting near
the outer edge of the bottom of this second portion and converge into one hole at
the nipple end which fits into the pump. The effect is that when the two faces are
a little apart the air is at liberty to escape or to enter at the will of the person
operating the pump. When the tyre is sufficiently inflated the two faces are
brought together and as the holes in the two faces uever come opposite to each
other a joint is made either by metal to metal or by a washer. I do not confine
myself to the faces as they may be cup and ball or flat or other effective shape.
In order that my invention may be clearly understood and more easily carried
into practical effort I have appended hereunto a double sized sheet of drawings
upon which three modifications are shown which will enable others to apply my
invention to any other cases found in practice.
Figure 1. is a general view of a tyre T in its rim R with the air valve consisting
of two portions A and B applied thereto but the mode of connecting A to the inner
tube forms no part of my invention as it may be applied in any known manner.
Figure 2. is a sectional elevation of the inner portion A broken off and the outer
portion B applied thereto but with B unscrewed sufficiently to allow the air to
pass, that is the valve is there shown open.
Figure 3. is a similar view to Figure 2. but with the part B screwed home which
closes the air passages.
Figure 4. is a cross section on the line 1. 2. looking to the right hand.
Figure 5. is a similar section to Figure 2. but showing a different washer or
seating E. and the valve open.
Figure 6. is a section same as Figure 5 but with the air passages closed.
Figure 7. is an external elevation of A and B closed as seen at Figure 6.
Figure 8. is an enlarged view showing the cup or washer E in detail during the
forward stroke of the pump.
Figure 9. is a similar view to Figure 8 but showing the washer E, with the
teat closing the air passage a¹.
It will be noticed that the nipple A is provided with the air passage a¹ and that
the point has the recess a³ into which leather, rubber or other washer E is
inserted. The portion B fits over the nipple A having the nipple & to receive
the air-pump. The air passage in B divides into two or more passages 63 and 6*
issuing at the point on each side the centre as seen at Figure 4, as well as at
Figures 2. 3. 5., and 6. The consequence is that when A and B are screwed
together as seen at Figures 3 and 6 the centre portion 66 blocks the hole a¹ and no
air passes.
But when the faces are drawn apart as seen at Figures 2 and 5 air can
pass inwards from the pump. The object of the flange e² is that when air is being
pumped in it is forced open against the inside of B and no air can escape as seen by
the cularged Figure 8 which illustrates the result of the forward stroke of the
pump, which forces the part forward from covering the holes 63 and 6ª of which
there may be any number around the centre either round the teat 6 or nearer the.
edge. The part 3 Figure 8. would lie over the holes 63 and during the back
stroke of the pump but when B is screwed up as in Figure 9. it would be normal
except as a supplemental security. All the views except Figure 1 are more or less
increased in size so as to show the details more clearly.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I hereby declare that what I
claim is --
The improvements in valves for pneumatic tyres having a seating such as E with
a hole communicating with the hole a' in A in combination with the part B having

page_text: one, two, or more holes such as 63 and 6* which do not come opposite to the hole a¹
substantially as and for the purpose herein set forth and shown upon the drawings
by Figures 2, 3, 4, 5, 6, 7, 8, and 9.
Dated this 13th day of September 1895.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent for Applicant.