IMPROVEMENTS IN THE CONSTRUCTION OF SCREW TAPS
Year: 1884

page_text: I DAVID GILL of Weston-super-mare in the County of Somerset Plumber
do hereby declare the nature of my Invention for IMPROVEMENTS IN THE
CONSTRUCTION OF SCREW TAPS to be as follows:-
The object of my Invention is to construct scrow taps, for the passage of water
and other fluids, in an improved manner.
I place a valvo in the boss, into which the shank of the cock is screwed; (usually
a flap valve) in such a manner that a projection on the shank of the tap will open
the same, and retain such valve open, as long as the tap is attached thereto; but
when the tap is removed, for repair or otherwise; the valve in the boss immediately
closes, and prevents the issue of any water or other fluid through the boss.
The lower end of the improved screw tap is fitted with a screw plug, the size
and screw thread of which exactly coincides with the size and scrow thread of the
boss; and in case the valve in the boss should happen to loak, this plug can be
used to effectually stop the same while the cock being repaired, and until the
same is replaced.
I construct the valve seat, in the tap, circular; the valve being below the scat,
and the pressure of the water under the valve. This arrangement enables me to
make the valve self-adjusting, the spindle being attached thereto with sufficient
play to enable the valve to press equally and evenly against the seat. Moreover
the spindle can be turned round without the valve revolving.
The upper end of the spindle passes through a guide and stuffing box, and has a
screw thread cut theroon, to which screw thread a fly nut or equivalent device is
fitted, by turning which in one or the other direction the tap is opened or close 1.
Dated 15th January 1884.

page_text: I DAVID GILL of Weston-super-mare in the County of Somerset Plumber
do hereby declare the nature of my said Invention for "IMPROVEMENTS IN THE
CONSTRUCTION OF SCREW TAPS," 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 to construct screw taps, for the passage of water 5
and other fluids, in an improved manner, affording security against waste of water
when fitting, cleansing repairing, or renewing the taps.
"
In this Specification the word "cistern is intended to include all other
receptacles, and the word "water" includes all other fluids to which my Invention
is applicable.
I fit into the cistern a boss end, having an internal screw thread, and I screw
thereinto a metallic lining, consisting of a short tube or cylinder, having an
external screw thread to fit into the boss, and an internal screw thread to recoive
the end of the tap. This metallic lining has a conical swing valve opening inwards
towards the cistern, and self-closing by the pressure of the water, when it is not
held open as hereinafter mentioned.
The inner end of the tap has a short projection, with a small knob at the end,
which projects inwards against the swing valve, and retains such valve open; but
when the tap is removed, for repair or otherwise, the valve in the liner immediately
closes and prevents the issue of water through the boss.
My improved tap consists of a circular valve and screw spindle fitting against an
inverted seat, in such a manner that the pressure of the water assists in keeping
the same closed, when screwed up. The valve is self-adjusting, the spindle being
attached thereto with sufficient play to enable the valve to press equally and
evenly against the seat. Moreover the spindle can revolve without revolving the
valve.
The upper end of the spindle passes through a guide and stuffing box, and has a
screw thread cut thereon, and a handle at the top of the spindle is fitted, by
turning which in one or the other direction the tap is opened or closed.
And in order that my said Invention may be clearly understood, reference is
hereby made to the accompanying Drawings, in which similar letters of reference
indicate corresponding parts.
Fig. 1. is an external view of my Invention complete, and Fig. 2 shews the same
in section. a is the boss end which is screwed into the cistern, bis the liner
which is screwed into the boss end. This liner carries the swing valve cat its
inner end, as shewn separately in Figs. 6 and 7. Fig. G. being a section and Fig. 7
an end view. The valve c is mounted on a spindle d, which sits loosely in
bearings c. When the liner b is screwed into the boss end a, the valve c is closed
by the pressure of the water and no outflow can take place.
Fig. 3. represents the tap fready for insertion into the liner. When so inserted
the pin end g presses against the valve cand opens the same, as shewn in Figs. 2
and 5, and retains the saine open, and thereby allows the water to gain access to
the tap. The pin g is sustained by the cross bars shewn in Fig. 4.
Fig. 5. shows the tap (in section) inserted into the liner b and lifting the valve c;
and, the screw valve being down, the water can flow in the direction of the
arrows,
The tap consists of an inverted valve seat which can be facod up on removing
the plug i for the insertion of the necessary tools. This plug is usually made to

page_text: fit the boss end or the liner. The valve fits loosely upon the spindle m which
spindle has a quick, or double threaded screw, working in the nut n watertight.
The tap is shewn closed in Fig. 2, and open in Fig. 5.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. The combination with taps for the purposes aforesaid of a boss end a fitted
with the moveable liner b carrying the valve c substantially as described and
shewn in the Drawings.
2. The combination with taps for the purposes aforesaid, of the projection g for
opening the valve c substantially as described and shown in the Drawings.
3. The general combination and arrangement of the several and respective parts,
together formning my improvements in the construction of screw taps, herein before
described and shewn in the Drawings or any mere modification thereof.
1
ד.
TJ
GEO. DOWNING,
Agent for Applicant.