Year: 1889

page_text: Date of Application, 19th Feb., 1889
Complete Specification Left, 10th Apr., 1809
Complete Specification Accepted, 18th May, 1839
GEORGE PINKER Engineer 1 Grummant Road Peckham Road London S.E. do
hereby declare the nature of this said invention to be as follows:-
My invention relates to improvements in that class of Hydraulic Lifts in which the
cage and load are raised by a direct Ram fixed under the cage and raising the same
without the intervention of chains or pulleys. The Ram having usually to be made
larger in diameter for the sake of strength, than is necessary to raise the load, there is
a corresponding loss of water, which it is the object of my invention to prevent. To
effect this employ an auxillary apparatus comprising two cylinders, one smaller than
the other, fixed or held together with stretchers so that one long Ram works in them
both the said Ram being reduced at one end to suit the smaller cylinder. The
reduced part of the Ram is made hollow, and is fitted with a stuffing box and gland at
its extreme end, into which works another small Ram, the end of which is secured to
the outer cover of the smaller cylinder. The larger cylinder is in free communication
with the working cylinder of the Lift, so that as the cage ascends and descends, the
water flows from one to the other and is not consuined.
The water from the
accumulator is admitted to the small cylinder, in which there are two chambers, the outer
one formed by the hollow, reduced end of Ram and its cylinder, and the inner one
formed by the small Ram which is secured to the cover of the smaller cylinder,
working in the hollow end of the inain Ram. By means of a suitable valve or valves,
water from the accumulator may be admitted to one or both of these chambers, if
admitted to one, the Ram is forced out exerting only a portion of its power, and the
cage is raised with a portion of the full load, if the water is admitted to both, the Ram
is forced out, exerting its full power, and the cage is raised with the maximuin load for
which the Lift is constructed. The apparatus may be fixed in any suitable position.
If fixed vertically, the Ram may be weighted so as to nearly counterbalance the
weight of the working Ram and cage, and the quantity of water used will be still
further reduced. By means of this invention, direct acting Lifts can be made with
three powers, and a large saving effected in the consumpton of water.
Dated this Nineteenth day of February 1889.
:

page_text: I, GEORGE PINKER Engineer 1 Grummant Road Peckham Road London, S.E.
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 :-
My invention relates to that class of Lift in which the cage and load are raised by a
direct ram fixed under the cage, and raising the same without the intervention of
chains or pulleys.
The ram having usually to be made larger in diameter for the sake of strength than
is necessary to raise the load, there is a corresponding loss of water which it is the
object of my invention to prevent. To effect this 1 employ an auxillary apparatus,
comprising two cylinders, one smaller than the other, fixed or held together with
stretchers or a bed plate, so that one long ram works in them both, the said ram being
reduced at one end to fit the smaller cylinder. The reduced part of the ram is made
hollow and is fitted with a stuffing box at its extreme end, into which works another
small ram, the end of which is secured to the outer cover of the smaller cylinder.
The large cylinder is in free communication with the working cylinder, so that as the
cage ascends and descends, the water flows from one to the other and is not consumed.
The water from the accumulator is admitted to the small cylinder, in which there are
two chambers, the outer one formed by the hollow reduced end of ram and its cylinder,
and the inner one formed by the small ram which is secured to the cover of the
smaller cylinder, working in the hollow end of the main ram. By means of a suitable
valve or valves, water from the accumulator may be admitted to one or both of these
chambers, if admitted to one, the rain runs out exerting only a portion of its power,
and the cage is raised with a light load. If the water is admitted to both, the ram
runs out, exerting its full power, and the cage is raised with the maximum load for
which the Lift is constructed. The apparatus may be fixed in any suitable position,
if fixed vertically, the ram may be weighted so as to nearly counterbalance the weight
of the working ram and cage, and the quantity of water used will be still further
reduced. By means of this invention, Direct acting Lifts and other similar hoisting
machinery can be made with three powers, and a large saving effected in the
consumption of water. Instead of fitting the hollow reduced part of the ram with a
gland and stuffing box, I may prefer to bore out the said hollow reduced part, and fit
the end of the fixed small ram with a piston.
The accompanying drawings illustrate my invention, the same letters indicate
similar parts in cach figure.
Fig. 1 is a section showing the apparatus fixed vertically, and the ram loaded with
weights to partly counterbalance the lifting ram and cage, a is the cylinder in
communication with the lifting cylinder and ram by means of the pipe a, b, b₁ is the
long ram, the end b, being reduced in diameter, is the crosshead formed on, or
bolted to the centre of the long ram, and W, W, are weights suspended to the same.
2

page_text: d is a stuffing box on the end of the reduced ram b₁. E is the small ram fixed to outer
cover of the smaller cylinder f. In Fig. 2 the valve g is shewn to a larger scale, and
it will be seen that there are two ports H and i. In Fig. 1 the valve is shown fixed in
position, port H being in communication with the outer chamber J and port i being
in communication with the inner chamber J₁. Fig. 3 shows the apparatus fixed
horizontally without balancing weights. Fig. 4 shows the end of the ram b₁ bored,
and the small ram E fitted with a piston K.
Fig. 5 is an elevation, and Fig. 6 a plan, of the arrangement I use for obtaining three
powers from the apparatus, ₁ are two ordinary slide valves, such as are commonly
used for actuating hydraulic lifts and cranes. The slide rods are fitted with
pins m, m, which work in cam grooves n, m, cut in the sides of the hand rope drum O, the
drum is turned by pulling the hand rope, and the slides are moved by the pins working in
the grooves, thus, when the parts are in the position shown in the drawing with the index
on the drum pointing at L, the exhaust ports are open and the apparatus is lowering,
when the index is moved to S the ports would be closed and the apparatus would be
stationary, at 5 the valve would still be closed and the other valve would be open
admitting water to the chamber J, at 10, valve would be closed and valve ₁ would
be open admitting water to the chamber J1, at 15 both valves would be open and the
full power of the apparatus exerted. In erecting the apparatus, the valves 14 and
rope drum would be fixed in any suitable position, and the chambers J J₁ connected
to their respective valves by pipes.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
1. The arrangement of Rams and cylinders as herein illustrated and described for
the purpose of obtaining two or more powers from an Hydraulic Lift or Hoist..
2. The arrangement of valves worked by a cam, substantially as and for the purpose
herein set forth.
Dated this Tenth day of April in the year of our Lord One thousand eight
hundred and eighty nine.