Improvements in Machinery for Making Fireclay Retorts, Sanitary Pipes, Slabs, and other like Articles by Hydraulic Power, and in an Equilibrium Hydraulic Valve Employed therein.
Year: 1895

page_text: Date of Application, 10th Dec.. 1895
Complete Specification Left, 5th Sept., 1896-Accepted, 17th Oct., 1806
PROVISIONAL SPECIFICATION.
Improvements in Machinery for Making Fireclay Retorts, Sanitary
Pipes, Slabs, and other like Articles by Hydraulic Power, and in
an Equilibrium Hydraulic Valve Employed therein.
We THOMAS CONSTANTINE FAWCETT of the Whitehouse Engineering Works
Hunslet, in the City of Leeds and County of York, Machine Maker, and JAMES
DAWSON FAWCETT of the same place Manager do hereby declare the nature of
this invention to be as follows:-
The first part of our invention relates to machinery for making fireclay retorts
and other like articles by hydraulic power as set forth in a prior Patent No. 16808
of 1890 granted to the first named applicant. The object of our present improve-
ments is to release and take the weight off the table after a retort or pipe has
been made under pressure.
According to our invention one of the clips or arms under the table rest upon
an eccentric connected to a lever and a pin which eccentric is lowered by the
workman through the medium of the lever whereby the pressure is released or
removed from the table permitting it to be turned around off the clips.
The second part of our invention relates to an hydraulic equilibrium valve
employed in the above named machinery, but the said hydraulic equilibrium
valve is also applicable to other machinery.
According to the present construction of circular hydraulic valves great power
is required to turn the valve upon its seating, in consequence of the pressure of
water at the back of the said valve. There has also been unequal wear and tear
upon the seating of the valve, and upon the face of the valve, in consequence of
the pressure between the two faces.
The primary object of our invention is to remove the pressure from off the
faces of the valve and this we accomplish by equalising the area at the back and face
of the valve, whereby the said valve is kept in a state of equilibrium by which means
the valve can be rotated upon its seating with comparative ease and consequent less
wear and tear.
In carrying out our invention we form a shoulder or collar at the foot of the
valve spindle or on the back of the valve so as to provide increased surfaces to
receive the pressure of water consequently the pressure upon the valve is divided
between the face of the valve and the back thereof. Instead of the valve seating
being flat as is usual we propose to make it conical so as to equalise the friction on
those parts as we find when the surfaces are flat that that portion of the valve,
near the inlet-port receives more pressure than the opposite side of the valve, and
there is a tendency for the valve to be lifted or raised slightly from its seating,
but this is overcome by making the valve with a conical seating.
Instead of forming a shoulder or collar at the foot of the valve spindle, the whole
of the spindle may be thickened for equalising the area to meet the pressure of
water.
Dated this 9th day of December 1895
;
TASKER & CROSSLEY.
Halifax, Patent Agents.
.

page_text: GUBILMIN SPECIFICATION.
Improvements in Machinery for Making Fireclay Retorts, Sanitary
Pipes, Slabs, and other like Articles by Hydraulic Power, and in
an Equilibrium Hydraulic Valve Employed therein.
We, THOMAS CONSTANTINE FAWCETT, of the Whitehouse Engineering Works,
Hunslet, in the City of Leeds and County of York, Machine Maker, and JAMES
DAWSON FAWCETT, of the same place, Manager, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The first part of our invention relates to machinery for making fireclay retorts
and other like articles by hydraulic power as set forth in a prior Patent No. 16,808
of 1890 granted to the first named applicant. The object of our present improve-
ments is to release and take the weight off the table after a retort or pipe has
been made under pressure.
According to our invention one of the clips or arms under the table rests upon
an eccentric connected to a lever and a pin which eccentric is lowered by the
workman through the medium of the lever whereby the pressure is released or
removed from the table permitting it to be turned around off the clips.
To demonstrate more clearly our improvements we make reference to the
accompanying sheets of drawings where Fig. 1 is a plan view of a table on which
the mould for forming the mouth piece of a sanitary pipe is attached, Fig 2 being
elevation of the bottom portion of the moulding chamber for forming sanitary
pipes. A represents a portion of the moulding chamber, and B the spigot end of
a sanitary pipe, whilst C is the mould for forming the spigot end of a sanitary
pipe, such mould being suitably attached to the circular table D, the latter being
connected to the hydraulic ram E.
When the ram is at its uppermost position and a pipe about to be moulded, the
workman moves the handle F in the direction of the arrow, placing the radial
arms D fixed to the underside of the table D on to snecks H projecting from the
base of the moulding chamber as shewn in Fig. 2, but when a sanitary pipe has
been moulded there has been great pressure put upon the radial arms G and also
on the snecks H and hitherto great difficulty has been experienced in removing
the radial arms from their resting place. To overcome this, we employ an
eccentric connected to lever arm J. This eccentric can be brought under one
of the arms G, as seen in Fig. 2, so as to release the pressure off the radial arms,
and simultaneously with such movement of lever J a pin I. connected to the
eccentric is also moved with the movement of the lever J, the said pin coming
against one of the radial arms and pushing it and the rest of the radial arms, as
shewn in dotted lines, off the clips or snecks, this improvement being of great
advantage to the workman. Fig. 3 is front elevation of the sneck H and radial
arm G and Fig. 4 is a plan view. The full line shews the radial arms G on the
snecks, whilst the dotted lines shew the radial arms clear of the snecks.
The second part of our invention relates to an hydraulic equilibrium valve
employed in the above named machinery, but the said hydraulic equilibrium
valve is also applicable to other machinery.
According to the present construction of circular hydraulic valves great power is
required to turn the valve upon its seating, in consequence of the pressure of water,
at the hack of the said valve.
There has also been unequal wear and tear upon the seating of the valve,
and upon the face of the valve, in consequence of the pressure between the two
faces.
The primary object of our invention is to remove the excessive pressure off the
aces of the valve and this we accomplish by equalising the area at the back and face

page_text: of the valve, whereby the said valve is kept in a state of equilibrium by which means.
the valve can be rotated upon its seating with comparative ease and consequent less.
wear and tear.
In carrying out our invention as illustrated in Fig. 5 which is section of our
improved valve, we form a shoulder or collar A on the valve spindle B so as to
provide an increased surface to receive the pressure of water. By making collar A
on that particular part of the spindle B a chamber or cavity C is formed between the-
top of the valve D and the shoulder A which equalises the area between the two
parts, therefore when water is admitted into the chamber or cavity C the said water.
is forced against the two surfaces, consequently the valve is kept in a state of
equilibrium and the face of the valve is not forced against the seating with that
excessive pressure which would happen if there were no shoulder A on the spindle,
the pressure being now divided between the two opposing parts A, D.
It is obvious that instead of forming a shoulder or collar A on the spindle, that the
thickened part A may be extended to the whole length of the spindle.
Instead of the valve seating being flat as is usual in this class of hydraulic valve,.
we make it conical as shewn in E in the annexed drawings, so as to equalise the
friction on those parts as we find when the surfaces are flat or at right angles to.
the spindle that, that portion of the valve near the inlet port F receives more
pressure than the opposite side or outlet G of the valve, as at the inlet there is a
tendency for the valve to be lifted or raised slightly from its seating, but this is
overcome by making the valve with a conical seating as shewn in the drawings.
Having now particularly described and ascertained the nature of our said inven--
tion and in what manner the same is to be performed, we declare that what we
claim is :-
Firstly. In machines for making fireclay retorts, sanitary pipes, and the like, the
combination therewith of eccentric I lever arm J and pin L for relieving pressure off
the table D employed in the manner and for the purposes herein set forth.
Secondly. In an equilibrium hydraulic valve the formation of a collar A (or its
equivalent) on spindle B for equalising the area at the back of the valve as herein.
described and illustrated.
Thirdly. In an equilibrium hydraulic valve, the formation of a collar A (or its.
equivalent) in combination with conical valve seating E as illustrated in Fig. 5.
Dated this 4th day of September 1896.
TASKER & CROSSLEY,
Halifax, Patent Agents.