Improvements in Hydraulic Hoisting Apparatus.
Year: 1890

page_text: Date of Application, 10th Sept., 1890
Complete Specification Left, 8th June, 1891-Accepted, 8th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Hydraulic Hoisting Apparatus.
I, DAVID (CYNRIG) THOMAS, of Bronwydd, Llanishen, near Cardiff, in the
County of Glamorgan, Ironmonger, do hereby declare the nature of this invention
to be as follows:-
I employ two hydraulic cylinders placed side by side, the pistons or rams of
which work simultaneously and in the same direction. The cylinders and rams
carry pulleys over which the rope or chain or ropes or chains pass:-thus if the
increase of power is to be four to one the ends of the chains (if several are used)
are fixed to the cylinders or frame and are then led side by side over pulleys on the
ram of one cylinder, then over pulleys on the same cylinder, next over pulleys on
the ram of the other cylinder, back over pulleys on the second cylinder and so to
the load.
A pipe for supplying water to the cylinders is connected to the inner end (or end
opposite to the ram) of the first cylinder, and to the outer end of the second cylinder,
a three way cock being provided so that the latter passage may be closed to the
supply and opened to the exhaust or waste. The supply to the first cylinder always
remains open. There is also a pipe connecting the outer end of the first cylinder
to the inner end of the second cylinder.
The action of the apparatus is as follows:-
When lifting the water enters at the inner end of the first cylinder and forces its
ram outwards and also forces out the water originally in the outer end of the first
cylinder through the connecting pipe into the inner end of the second cylinder, so
forcing out its ram also. The water in front of the ram of the second cylinder goes
to the exhaust the three way cock being so turned as to cut off the supply and open
the exhaust. In the return motion the inner end of the first cylinder and the outer
end of the second cylinder are both open to the supply but as the exhaust is closed
there is no expenditure of water the motion being effected by the weight of the cage
or counterbalance weight. As the rams move in the water contained at the inner
end of the first cylinder is forced out and passes by the supply pipe into the outer
end of the second cylinder, whilst the water contained in the inner end of the second
cylinder passes by the connecting pipe into the outer end of the first cylinder.
In order to keep the pipe connecting the two cylinders always full of water a
branch pipe is provided to it from the supply pipe.
Dated this 9th day of September 1890.
COMPLETE SPECIFICATION.
Improvements in Hydraulic Hoisting Apparatus.
1, DAVID (CYNRIG) THOMAS, of Bronwydd, Llanishen, near Cardiff, in the
County of Glamorgan, Ironmonger, 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 :-
I employ two or more hydraulic cylinders placed side by side, the pistons of
which work simultaneously and in the same direction. The cylinders and piston
rods carry pulleys over which the rope or chain or ropes or chains pass-thus if
the increase of power is to be four to one the ends of the chains (if several are used)

page_text: are fixed to the cylinders or frame and are then led side by side over pulleys on
the piston rod of one cylinder, then over pulleys on the same cylinder, next over
pulleys on the piston rod of the other cylinder, back over pulleys on the second
cylinder and so to the lond.
A pipe for supplying water to the cylinders is connected to the inner end (or end
opposite to the piston rod) of the first cylinder, and to the outer end of the second
cylinder, a three way cock being provided so that the latter passage may be closed
to the supply and opened to the exhaust or waste. The supply to the first cylinder
always remains open. There is also a pipe connecting the outer end of the first
cylinder to the inner end of the second cylinder.
The action of the apparatus is as follows:--
When lifting the water enters at the inner end of the first cylinder and forces its
piston outwards and also forces out the water originally in the outer end of the first
cylinder through the connecting pipe into the inner end of the second cylinder, so
foreing out its piston also. The water in front of the piston of the second cylinder
goes to the exhaust the three way cock being so turned as to cut off the supply and
open the exhaust. In the return motion the inner end of the first cylinder and the
outer end of the second cylinder aro both open to the supply but as the exhaust is
closed there is no expenditure of water the notion being effected by the weight of
the cage or counterbalance weight. As the pistons move in the water contained at
the inner end of the first cylinder is forced out and passes by the supply pipe into the
onter end of the second cylinder, whilst the water contained in the inner end of the
second cylinder passes by the connecting pipe into the outer end of the first
cylinder.
In order to keep the pipe connecting the two cylinders always full of water a
branch pipe is provided to it from the supply pipe.
It will be obvious that three or more cylinders may be similarly arranged.
In order that my said invention may be more fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.
Figure 1 is an elevation.
Figure 2 is an end elevation, and
Figure 3 a plan of an apparatus constructed according to my invention.
A and B are hydraulic cylinders on whose ends are mounted pulleys C and D
the heads of their piston rods carrying pulleys E and F.
The ends of four ropes G
working side by side, are fixed to the frame at H and pass in turn over the
pulleys ECFD to the load. is the supply pipe always open to the inner end
of the cylinder A and capable of being opened to the outer end of the cylinder B
by the three-way cock K which also opens this end of the cylinder B to the
exhaust L. M is a pipe connecting the outer end of the cylinder A to the inner
end of the cylinder B. N is a pipo for keeping the space between the two pistons
always filled with water, and O is a stop cock or self acting valve.
Figure 4 is an elevation of a modified arrangement particularly suitable for high
pressures. In this case there is no exhaust from the outer end of the cylinder B
and the water in place of being discharged from the outer end of the cylinder B
during the ascent of the load is discharged from the inner end of the cylinder A
whilst the load is descending. The three-way cock is placed at the inner end of
the cylinder A. which instead of always being open to the supply is alternately open
to it and to the exhaust.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
1. Hydraulic hoisting apparatus in which there is a series of cylinders placed

page_text: side by side whose pistons move together in the same direction liquid being trans-
ferred from the outer end of one cylinder to the inner end of the next cylinder or
vice versa substantially as described.
2. Hydraulic hoisting apparatus substantially as described and shown in the
drawings.
Dated this 5th dose of Tune 1901
CARPMAEL & Co.,
Agents for the Applicant.