IMPROVEMENTS IN THE CONSTRUCTION OF TAPS AND VAT VO SPECIFICATION OF TAPS AND VALVES
Year: 1882

page_text: LETTERS PATENT to Joseph Nixon, of Oldham, in the County of Lancaster.
for an Invention of IMPROVEMENTS IN THE CONSTRUCTION OF TAPS AND
VAT VO
PROVISIONAL SPECIFICATION left by the said Joseph Nixon at the Office
of the Commissioners of Patents on the 20th June 1882.
JOSEPH NIXON of Oldham in the County of Lancaster
THE CONSTRUCTION OF TAPS AND VALVES"
"IMPROVEMENTS IN
"
This invention relates to that class of taps and valves known as
screw down "
taps and valves such as are used for hot water or for water or other fluids at a high
pressure. They are also suitable for acids.
The invention consists in the construction of the plug which closes the central
aperture and in the method of its attachment to the screwed spindle.
I first form a cylindrical cup or box of metal (the diameter of the plug required)
the interior of which is undercut and through the centre I form a countersunk
hole. Through this hole I pass from the inside a pin with a conical head fitting
the hole, so that the cup or box can revolve upon it. I then place inside the box a
thin washer of metal and I mould therein a plug of india rubber of the same
diameter as the exterior of the box; the part of the plug fitting into the counter-
sunk part of the metal box forming a secure attachment and at the same time that
the plug is free to turn upon the conical headed pin. The india rubber plug is
formed partly hollow so that the surface which closes the aperture of the tap or
valve is annular in form.
The plug after being properly vulcanized is then attached to the end of the
screwed spindle in the following manner. A hole is drilled in the end of the
screwed spindle to receive the end of the conical headed pin which projects from
the metallic cup of the plug and the projecting part of the pin being inserted
therein, a transverse hole is drilled through the two and a pin or wire driven
through, so as to unite the plug firmly to the screwed spindle, and at the same time
to allow the latter to revolve when the plug is in contact with the seating without
screwing the plug or valve itself round.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Nixon in the Great Seal Patent Office on the 19th December
1882.
JOSEPH NIXON of Oldham in the County of Lancaster
THE CONSTRUCTION OF TAPS AND VALVES
IMPROVEMENTS IN
"
This invention relates to that class of taps and valves known as "screw-down
taps and valves such as are used for hot water or for water or other fluids at a
high pressure. They are also suitable for acids.
The invention consists in the construction of the plug which closes the central
aperture and in the method of its attachment to the screwed spindle.
Such being the nature and object of my said Invention I will now proceed to
describe the manner in which the same is to be or may be performed or carried
into practical effect and in order that the same may be clearly understood I have
annexed hereunto a sheet of drawings illustrative thereof and have marked the
same with figures and letters of reference corresponding with those in the following
explanation thereof.
Fig 1. in the annexed drawings is a vertical section a tap mado according
to my invention and Fig. 2 is a similar view of a slight modification of the same.
a, a is the body of the tap which is of the usual construction having a mid-
feather b, bcast therein which forms the seating for the plug.
In making the latter I first form a cylindrical cup or box c, c of metal (the
diameter of the plug required) the interior of which is undercut and through the
centre 1 form a countersunk hole. Through this holo I pass from the inside a
pin d, d with a conical head e, e fitting the hole so that the cup or box c, c can
revolve upon it. I then place inside the box c, c a thin washer of metal f, f and
I mould therein a plug g, g of india rubber of the same diameter as the exterior of
the box c, c the part of the plug fitting into the countersunk part of the
metal box c, c forming a secure attachment and at the same time that the plugg, I
is free to turn upon the conical headed pin. The india rubber plug g, g is formed
partly hollow at h, h so that the surface which closes the aperture in the midfeather
of the tap or valve is annular in form.
The plug g, g after being properly vulcanized is then attached to the end of the
screwed spindle i, i in the following manner.
A hole is drilled in the end of the screwed spindle i to receive the end of the
conical headed pin d, & which projects from the metallic cup cc of the plug and
the projecting part of the pin d, d is drilled through the two and a pin or wire h, k
is driven through, so as to unite the box c, c of the plug firmly to the screwed
spindle, and at the same time to allow the latter to revolve when the plug I
is in contact with the seating b, b without screwing the plug or valve g g itself
round.
In some cases instead of undercutting the interior of the cup or box c, c and
moulding the india rubber plug g, g therein I form the interior of the said cup or
box cylindrical, as shown at Fig. 2 and 1 mould and vulcanize the india rubber
plug separately from the cup or box c, c making it a tight fit therein so that it is
not liable to come loose.
Screw down valves of large diameter can be made in the same way.
Soft india rubber plugs will suffice for cold liquids, but for hot water they should
be made of harder rubber and of the hardest rubber for steam.
Having now described the nature and object of my said invention together with
the manner in which the same is to be or may be performed or carried into practical

page_text: effect I wish it to be understood that I claim as my Invention the peculiar
construction of the plug or valve as hereinbefore described and illustrated by the
annexed drawing, and the method of its attachment to the screwed spindle.
In witness whereof I the said Joseph Nixon have hereunto set my hand
and seal this Eighteenth day of December in the year of our Lord One
thousand eight hundred and eighty two
JOSEPH NIXON
(L.S.)