Improvements in and in connection with Hydraulic Presses.
Year: 1899

page_text: Date of Application, 5th Oct., 1899
Complete Specification Left, 28th June, 1900-Accepted, 1st Sept., 1900
PROVISIONAL SPECIFICATION.
Improvements in and in connection with Hydraulic Presses.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Buildings,
in the County of London, Consulting Engineer and Chartered Patent Agent, do
hereby declare the nature of this invention (as communicated to me from abroad
by the Firm of Haniel and Lueg, of Düsseldorf-Grafenberg, Prussia, Engineers
and Ironfounders) to be as follows:-
In hydraulic presses it is important for rapidly performing work, to accelerate
the return motion of the working plunger or piston.
The present invention has for its object to effect such rapid return motion by
causing the working stroke of the plunger to effect the compression of an elastic
medium, which reacts upon the pressure fluid during the return stroke. I
will describe the arrangenients for this purpose with reference to the accompany-
ing diagrammatic drawing.
a is a press, the working plunger or piston b of which is actuated by fluid
pressure supplied through pipe c, or the working plunger b of which is pushed
forward by a press-ram d acting on the liquid contained in the working cylinder q.
The return motion pistons e and the cylinders of which are subject to the arti-
ficially produced hydraulic pressure from a special conduit g h and accumulator
are in connection with the working piston by a cross head as shewn. Near the
cylinders of the pistons e and f there is arranged a receptacle i containing com-
pressed air or any other elastic medium acting directly on the hydraulic conduit g h
or such elastic pressure may be produced by means of a differential piston or a
press-ram arranged in the receptacle k, shewn in dotted lines. The hydraulic
conduit ༡ h is closed against the supply pipe of the artificially produced hydraulic
pressure, (i.e. against the apparatus producing such pressure, namely forcing
pump at and accumulator ) by a check valve m. As soon as the working
piston 6 moves forwards and drives forwards also the withdrawing pistons e and f,
the air contained in the receptacle i ork is compressed by the liquid displaced
from the cylinders of the pistons e and f this liquid being prevented by the
valve m from passing to the accumulator 1, and consequently the hydraulic pres-
sure acting on the pistons e and f is considerably increased in proportion to the
compression of the elastic volume enclosed in the receptacle or k. Consequently,
when the pressure on the working piston is released, its back-motion will be
effected very rapidly or with considerable acceleration by means of the pistons ef
acted on by the said increased pressure.
The pressure supplied from the conduit g or the accumulator 7 and the pump
at serves for producing the necessary pressure, at the beginning of the work-
ing, under the pistons ef and in the receptacle i. This supply also serves to
make good any water under pressure as soon as the pressure in the receptacle i
ork becomes lower than the pressure in the accumulator 7. With the said pine-
system and the receptacle i ork there is connected a pipe-conduit n n leading
to the working space of the working cylinder. An hydraulic regulating valve o

page_text: and a second check valve ? are interposed in this pipe conduit n. By setting
the valve o so as to open this communication the cylinders of the pistons e and f
and the working cylinder are put in communication with each other. In this
case the liquid subjected to the elastic pressure in the receptacle k or i, acting
also on the pistons e and f, will flow through n to the working piston; but the
pressure cannot by such expansion become lower than the pressure existing in
the conduit g or in the accumulator 1, as water under pressure will at once flow
through the return valve m from the conduit g, if the pressure should sink below
that point. On the other hand the valve o, the pipe-conduit n and the cylinders
of the pistons e and f &c., are protected by the return valve p against the higher
pressure existing in the working cylinder when in operation.
This return valve p is lifted either by an hydraulic piston p¹ or directly by
levers on the motion of the piston valve o, when the latter is set to open the
communication with the discharge pipe s.
Thus when the valve o is set so as to close pipen water can be discharged from
above the working piston b, as no water can then flow from the accumulator /
to the working cylinder, but a sufficiently large quantity of water under pressure
is supplied to the cylinders of the pistons e and f for producing the full return
stroke of the latter and of the working piston connected therewith.
valve o is in the middle position, the check-valve p will also be closed and any
higher pressure, which may exist in the working cylinder, is prevented from
being transmitted to the valve o or into the pressure conduit g.
Dated this 5th day of October 1899.
If the
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and in connection with Hydraulic Presses.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Buildings,
in the County of London, Consulting Engineer and Chartered Patent Agent, do
hereby declare the nature of this invention (as communicated to me from abroad
by the Firm of Haniel and Lueg, of Düsseldorf-Grafenberg, Prussia, Engineers
and Ironfounders) and in what manner the same is to be performed to be particu-
larly described and ascertained in and by the following statement:-
In hydraulic presses it is important for rapidly performing work to accelerate
the return motion of the working plunger or piston. The present invention has
for its object to effect such rapid return motion by causing the working stroke
of the plunger to effect the compression of an elastic medium, which reacts upon
the pressure fluid during the return stroke. I will describe the arrangements for
this purpose with reference to the diagrammatic drawing accompanying the
Provisional Specification. a is a press, the working plunger or piston b of which
is actuated by fluid pressure supplied through pipe c, or the working plunger b
of which is pushed forward by a press-ram acting on the liquid contained in
the working cylinder q. The return motion pistons e and f, the cylinders of which
are subject to the artificially produced hydraulic pressure from a special conduit gh
and accumulator / are in connection with the working piston by a crosshead as
shewn. Near the cylinders of the pistons e and f there is arranged a receptacle i
containing compressed air or any other elastic medium acting directly on the
hydraulic conduit g h or such elastic pressure may be produced by means of a
differential piston or a press-ram arranged in the receptacle k shewn in dotted
lines. The hydraulic conduit g h is closed against the supply pipe of the arti-

page_text: As
ficially produced hydraulic pressure (i.e. against the apparatus producing such
pressure, namely forcing pump at r and accumulator 2) by a check valve m.
soon as the working piston 6 moves forwards and drives forwards also the with-
drawing pistons e and f, the air contained in the receptacle i ork is compressed
by the liquid displaced from the cylinders of the pistons e and f this liquid being
prevented by the valve m from passing to the accumulator and consequently
the hydraulic pressure acting on the pistons e and f is considerably increased in
proportion to the compression of the elastic volume enclosed in the receptacle i
or k.
Consequently when the pressure on the working piston is released, its
back-motion will be effected very rapidly or with considerable acceleration by
means of the pistons ef acted on by the said increased pressure.
The pressure supplied from the conduit g or the accumulator and the pump
at serves for producing the necessary pressure at the beginning of the work-
ing, under the pistons ef and in the receptacle i. This supply also serves to
make good any water under pressure as soon as the pressure in the receptacle i
ork becomes lower than the pressure in the accumulator 7. With the said pipe-
system and the receptacle i ork there is connected a pipe-conduit n n leading
to the working space of the working cylinder. An hydraulic regulating valve o
and a second check valve pare interposed in this pipe conduit n. By setting
the valve o so as to open this communication the cylinders of the pistons e and f
and the working cylinder q are put in communication with each other. In this
case the liquid subjected to the elastic pressure in the receptacle k or acting
also on the pistons c and f, will flow through n to the working piston; but the
pressure cannot by such expansion become lower than the pressure existing in
the conduit g or in the accumulator 7, as water under pressure will at once flow
through the valve from the conduit g, if the pressure should sink below that
point. On the other hand the valve o, the pipe conduit and the cylinders of
the pistons e and f are protected by the valve against the higher pressure
existing in the working cylinder when in operation. This valve p is lifted either
by an hydraulic piston p¹ or directly by levers on the motion of the piston valve o,
when the latter is set to open the communication with the discharge pipes.
Thus when the valve o is set so as to close the pipe water can be discharged
from above the working piston b, as no water can then flow from the accumulator /
to the working cylinder but a sufficiently large quantity of water under pressure
is supplied to the cylinders of the pistons e and f. for producing their full return
stroke and that of the working piston b connected therewith. If the valve o
is in the middle position the check valve 7 will also be closed and any higher
pressure, which may exist in the working cylinder, is prevented from being
transmitted to the valve o or into the pressure conduit g.
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. A hydraulic press or machine having hydraulically operated return pistons e
and for the working piston b characterised by the fact that the hydraulic pres-
sure for the return cylinders taken by a pressure pipe g from a suitable accumu-
lator, is connected with an elastic power storer ork which is automatically
cut off by a check valve m from the accumulator so that an increase of pressure
takes place, during the advance of the working piston, in the elastic power
storer i ork, which on the return of the working piston acts upon the return
pistons, thus producing a rapid return movement of the working piston, the check
valve allowing the pressure water to flow from the accumulator 7, automatically
when the pressure in the return cylinders falls below the accumulator pressure.
2. A hydraulic press according to Claim 1 characterised by the fact that the pres-
sure water from the separate pressure pipe n is enabled by means of a distributing
valve o to act also on the working piston b in such a manner that at the same
time by means of the valve o pressure water is allowed to flow from the return

page_text: cylinders e and f to the working cylinder b, that is to say, a connection is
established between the working cylinder and the return cylinders, and the
separate pressure pipe n.
0
3. A hydraulic press according to Claim 1 characterised by the fact that a check
valve ?' is provided in the pipe between the working cylinder b and the distributing
valve o, which valve can be raised by hydraulic pressure or the like when the
distributing valve is moved into the exhaust position, for the purpose of letting
closes automatically
out the water from the working cylinder, or which valve
when the distributing valve is moved to the position of rest, for the purpose
of automatically shutting off from the distributing valve a higher pressure exist-
ing in the working cylinder, or of letting water out of the working cylinder in
a positive manner.
1
5011 Ja of 1000
ABEL & IMRAY,
Agents for the Applicant.