MENTS IN CISTERN VALVES
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by the said Henry Thomas Dawson
at the Office of the Commissioners of Patents on the 21st October 1881.
HENRY THOMAS DAWSON, of Chiswick, in the County of Middlesex.
MENTS IN CISTERN VALVES."
This Invention has for its object improvements in cistern valves.
"IMPROVE
In my improved cistern valve there is a chamber adapted to screw onto a nipple
at the end of the supply pipe.
The upper part of this chamber serves as an air vessel, and the chamber also
contains a glass or other ball valve. The water outlet is at the bottom of the
chamber, and it is surrounded by an india rubber ring upon which the ball valve
seats itself and closes the outlet.
On the front of the chamber on the exterior, and near the lower part, lugs are
formed which carry a pin serving as an axis for a float lever.
The lever is
continued past the pin and here takes the form of a curved horn, the point of which
as the float descends rises into contact with the underside of the ball valve; it
operates against the ball valve on one side (that next the pivot), and close up to
the seating, and displaces the ball valve from the seating by wedging or rolling it
to one side.
The purpose served by the air vessel is to prevent the chattering of the valve.
The peculiar form of lever adopted acts with threefold power on the ball; first,
by its leverage being short end of a long lever; second, by acting as a wedge driven
by the leverage; third, by acting only on one side of the ball valve, thus taking
only half of the dead pressure on the valve.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Thomas Dawson in the Great Seal Patent Office on the
20th April 1882.
HENRY THOMAS DAWSON, of Chiswick, in the County of Middlesex.
MENTS IN CISTERN VALVES."
This Invention has for its object improvements in cistern valves.
" IMPROVE-
In my improved cistern valve there is a chamber adapted to screw on to a nipple
at the end of the supply pipe. The upper part of this chamber serves as an air
vessel, and the chamber also contains a glass or other ball valve. The water
outlet is at the bottom of the chamber, and it is surrounded by an india rubber
ring upon which the ball valve seats itself and closes the outlet. On the front of
the chamber, on the exterior and near the lower part, lugs are formed, which carry
a pin serving as an axis for a float lever. The lever is continued past the pin
and here takes the form of a curved horn, the point of which as the float descends
rises into contact with the underside of the ball valve; it operates against the
ball valve on one side (that next the pivot) and close up to the seating, and
displaces the ball valve from the seating by wedging or rolling it to one side.
The purpose served by the air vessel is to prevent the chattering of the valve.
The peculiar form of lever adopted acts with three fold power on the ball;
1st by its leverage being short end of a long lever; 2nd by acting as a wedge
driven by the leverage; 3rd by acting only on one side of the ball valve, thus
taking only half of the dead pressure on the valve.
In order that my said Invention may be most fully understood and readily
carried into effect, I will proceed to describe the Drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a sectional elevation of my improved cistern valve.
Figure 2 is a back elevation, and Figure 3 is a sectional plan of the same.
A is a nipple in which the supply pipe terminates, the valve chamber B is
screwed upon it. The upper part B¹ of the chamber B serves as an air vessel; B² is
the water outlet, and C is an india rubber ring surrounding the outlet, it is
sprung into a shallow groove prepared to receive it; B3, B³, are lugs on the front
of the valve chamber B, and D is a pin passing through the lugs and through the
end of the float lever E, to which lever it forms the fulcrum. The lever E has a
curved horn E¹, and this as the float descends operates against the ball in the
effective manner already stated to give passage to the water.
F is a coiled spring which may with advantage be applied to press the ball
valve to its seat, it serves to keep the ball steady, to keep the valve tighter under
low pressures, and it renders the use of very accurately formed balls and seats
unnecessary.
Figure 4 shews another mode of putting together the parts of my improved
cistern valve.
Having thus described the nature of my said Invention, and the manner of
performing the same, I would have it understood that I claim my improved
cistern valve with its float lever and opening horn, substantially as described.
In witness whereof, I, the said Henry Thomas Dawson have hereunto set my
hand and seal, this Eighteenth day of April, in the year of our Lord One
thousand eight hundred and eighty-two.
HENRY T. DAWSON. (L.S.)