IMPROVEMENTS IN FLEXIBLE VALVES
Year: 1859

page_text: LETTERS PATENT to Thomas Barnabas Daft, of Tottenham, in the County.
of Middlesex, Civil Engineer, for the Invention of "IMPROVEMENTS IN
FLEXIBLE VALVES."
Sealed the 23rd March 1860, and dated the 12th October 1859.
PROVISIONAL SPECIFICATION left by the said Thomas Barnabas Daft
at the Office of the Commissioners of Patents, with his Petition, on the
12th October 1859.
I, THOMAS BARNABAS DAFT, of Tottenham, in the County of Middlesex,
Civil Engineer, do hereby declare the nature of the Invention for "IMPROVE-
MENTS IN FLEXIBLE VALVES," to be as follows:-
This Invention has for its object improvements in flexible valves. For
these purposes a flexible valve is constructed of an elastic flexible tube, by
preference, of vulcanized india-rubber, which is fixed at its two ends to two
inflexible tubes or instruments having passages through them, and which are
capable (one or both) of rotating, so as to twist the flexible elastic tube until
it forms a close partition across the passages in the inflexible tubes, or other
forms of instruments to which the two ends of the elastic flexible tube are
fixed.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twelfth day of October, in the year of our Lord
One thousand eight hundred and fifty-nine, in the twenty-third year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said Thomas Barnabas Daft, Her special licence that I, the said
Thomas Barnabas Daft, my executors, administrators, and assigns, or such
others as I, the said Thomas Barnabas Daft, my executors, administrators,
and assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United Kingdom of
Great Britain and Ireland, the Channel Islands, and Isle of Man, an Inven-
tion for "IMPROVEMENTS IN FLEXIBLE VALVES," upon the condition (amongst
others) that I, the said Thomas Barnabas Daft, my executors or adminis-
trators, by an instrument in writing under my, or their, or one of their
hands and seals, should particularly describe and ascertain the nature of
the said Invention, and in what manner the same was to be performed,
and cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Thomas Barnabas Daft, do hereby
declare the nature of the said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say :-
This Invention has for its object improvements in flexible valves. For
these purposes a flexible valve is constructed of an elastic flexible tube, by
preference, of vulcanized india-rubber, which is fixed at its two ends to two
inflexible tubes or instruments having passages through them, and which are
capable (one or both) of rotating, so as to twist the flexible elastic tube until
it forms a close partition across the passages in the inflexible tubes or other
forms of instruments to which the two ends of the elastic flexible tube are
fixed.
And in order that my said Invention may be most fully understood and
readily carried into effect, I will proceed to describe the Drawing hereunto
annexed.
DESCRIPTION OF THE DRAWING.
Figure 1 is a longitudinal section of a pipe having a valve applied to it,
constructed according to my Invention. a is a pipe which may be in con-
.1
it more he of man
constructed according to my Invention. a is a pipe which may be in con-
nection with a source of supply of water or other liquid, or it may be of gas or

page_text: air; 6 is a piece of vulcanized india-rubber tube firmly bound to the end of
the pipe a and also to the nozzle c, as is shown; d is a covering piece attached
by screws to the nozzle c, and a tap screw passes through the piece d, and its
end enters the groove a¹ in the pipe a, so that the piece d can be turned on
the end of the pipe, but cannot be pulled away from it; as shown at Figure 1
the valve is open, by turning round the nozzle c and the piece d the valve is
closed, and it then assumes the form shown at Figure 2. If it is necessary to
lock the piece d so as to hold the valve either open or closed, I connect a
handle to the said piece by a hinge joint, and notches are formed in a flange,
into which the handle can be folded down so as to lock the piece d in the
position in which it may have been placed.
Figure 3 shows a longitudinal section of valves constructed in the manner
already described and applied between the ends of two pipes, both of which
are fixed.
a, a¹, are the ends of the two pipes; b and b¹ are two vulcanized
india-rubber tubes bound to them, and these pipes 6 and 6' are also bound to
the central piece c, to which are attached by screws the casings d, d¹, which
protect the vulcanized india-rubber tubes. On the periphery of the piece c
worm teeth are formed, and it is turned to close the valve by means of a
worm, as is shown at Figure 4.
Valves constructed according to my Invention may be employed to close the
mouths of jars, and for many other similar uses.
Figures 5 shows in plan and section the upper part of a jar fitted with such a
valve; the construction of it is the same as that of the valves already described;
a tube of vulcanized india-rubber a is bound to the mouth of the jar b, and
also to the ring c which rests on the flange b' on the jar; by turning the ring c
the valve will close the mouth of the jar, as is shown at Figure 6. Apparatus
to lock the ring c in position so as to keep the valve closed may be applied, if
desired, but the friction of the lower edge of the ring on the flange which
supports it will generally be sufficient to keep the valve closed, and will
render the use of locking apparatus unnecessary.
In witness whereof, I, the said Thomas Barnabas Daft, have hereunto
set my hand and seal, this Twelfth day of April, in the year of our
Lord One thousand eight hundred and sixte