Year: 1898

page_text: Date of Application, 19th July, 1898
We, WILLIAM RAILTON, of 344, Walton Breck Road, Anfield, Liverpool, in the
County of Lancaster, RICHARD CAMPBELL, of 21, Monastery Road, Liverpool, afore-
said, and SAMUEL GEORGE RAILTON, of 11, Melbourne Street, Liverpool aforesaid,
Engineer, do hereby declare the nature of this invention to be as follows:--
This invention has for its object more especially the improvement in ash hoists
in steamers. At present these are usually worked with gearing and the sudden
strains which come upon the tooth gearing causing the fracture of teeth, and also
the noise of this tooth gearing are very troublesome especially in passenger
steamers.
Now by our invention we make a comparatively noiseless hoist free from these
sudden strains. In place of the usual gearing we employ sheave pulleys and for
motive power a steam and water (or oil) cylinder. The sheave pulley is attached
to the piston rod of the cylinder and the rope from the upper sheave pulley goes
over a guide pulley to the hoist. By having three pulleys in the sheave the speed
can be increased six times. The steam is let into the piston at the upper side only.
The lower side is freely connected with a head of water or oil by means of a small
pipe. When therefore steam or water in the case of hydraulic work is let into
the upper side of the piston the water or oil below being throttled by the small
pipe only gradually leaves the cylinder consequently the sudden pressure of the
gush of steam or water which is so prejudicial to ordinary geared hoists is done
away with and the bucket rises at a uniform speed proportionate to that at which
the oil or water can escape from the cylinder and rise to its head. The head of
oil or water is now ready to assist in raising the piston preparatory for another
hoist of the bucket. A small pipe from the top of the cylinder and if desirable
also from the bottom of the cylinder supplied with drain cocks takes off the sur-
plus water of condensation and enables one to empty the lower end of the cylinder
at any time if desired.

page_text: said, and SAMUEL GEORGE RAILTON, of 11, Melbourne Street, Liverpool aforesaid,
Engineer, 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;-
This invention relates to ash and other hoists, and is designed more especially
for use as an ash or coal hoist for steamers. At present these are usually worked
with gearing, the sudden strains that come upon the toothed gearing causing the
fracture of the teeth, and also the noise of this toothed gearing are very trouble-
some especially on passenger steamers.
Now by our invention we make a comparatively noiseless hoist free from these
sudden strains.
The invention will be understood from the following description, reference being
had to the accompanying drawings, in which:
Figure 1 is a front elevation of our invention applied as an ash hoist ;
Figure 2 a side elevation thereof.
In place of the usual gearing we employ a pair of pulley blocks A and B, one
above the other, in which several sheaves are arranged to run on the same pin bear-
ing in each block, and for motive power a steam and water cylinder C. The run-
ning pulley block A is attached to the piston rod D of the cylinder C, while the
standing pulley block B is fixed stationary to a bulkhead or any other suitable
object. The rope is secured at one end to a fixed point and passing over each
sheave alternately, finally goes from the upper block B over the guide pulley F to
the bucket. By having six sheaves in each block as shown in the drawing, the
speed can be increased twelve times, that is to say the bucket is raised twelve times
the stroke of the piston at each movement of the latter. The number of sheaves
can however be increased or decreased as desired, according to the distance the
bucket is required to travel. G are guide rods firmly secured at one end to the top
of the cylinder, and at the other to the block in which the sheaves B are mounted.
The pulley block A at the end of piston rod D slides on these guide rods G and
thus secures a steady up and down motion. Steam is let into the cylinder on the
upper side only of the piston through the steam valve H. The lower side is con-
nected with a head of water in the tank I by means of a pipe J. K is a cushion
valve which throttles the passage of the water to any required extent. When.
therefore steam is let into the cylinder on the upper side of the piston, the water
below being throttled by the cushion valve K only gradually leaves the cylinder C.
and consequently the sudden pressure of the gush of steam which is so prejudicial
to the ordinary geared hoists is done away with, and the bucket L rises at a
uniform speed proportionate to that at which the water can escape from the
cylinder C, and rises to its head, in the tank I, one object of the cushion valve being
to throttle the water and prevent any sudden rise of the bucket, thus securing that
it shall ascend at a determined speed. To lower the bucket all that is necessary is
to close the steam valve, thus opening the exhaust. The bucket will then descend
by its own weight assisted by the head of water in the tank. The valve M can be
regulated by hand so that it will adjust to a nicety the exhaust, and consequently
the speed of descent of bucket L with load, the throttling of the exhaust steam
acting as a cushion to the piston in its return stroke so as to secure the descent at
any speed required. The amount of steam required to operate the piston is small.
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:-
1. In hoists in which multiplying pulley sheaves are used to increase the travel
of the load, the combination for motive power of a cylinder with piston, to the rod
of which the running pulley sheaves are attached, and a water accumulator tank
having a pipe connecting the bottom end of the cylinder to the head of water in the
tank, and a throttle valve located in the said pipe, adapted to throttle the passage

page_text: of the water to any required extent, whereby if steam be let into the cylinder on the
upper side of the piston, the water below being throttled by the valve only gradually
leaves the cylinder and consequently the load rises at a uniform speed in proportion
to that at which the water can escape substantially as described.
2. In hoists, the use or employment as motive power therefor of a cylinder having
a piston to the upper side of which steam or other fluid is admitted, the lower side
being freely connected with a head of water by means of a pipe, whereby if steam
or other fluid be admitted into the upper end of cylinder above the piston, the water
or other liquid below being throttled by the pipe, will only gradually leave the
cylinder and the load will rise at a given uniform speed, its descent being similarly
controlled by throttling the exhaust steam, thus acting as a cushion to the piston
in its return stroke, substantially as described.
3. The general combined arrangement and construction of parts, forming our
improved hoisting apparatus for steamers and other purposes substantially as set
forth.
TY L 1
T
1000
WM. P. THOMPSON & Co.,
Patent Agents, of Liverpool, Manchester, Birmingham, & London.