Improvements in or connected with Lifts, Hoists, and analogous Machinery.
Year: 1894

page_text: "
Date of Application, 4th Oct., 1894
Complete Specification Left, 4th July, 1895-Accepted, 28th Jept.,
1895
PRUVIDIONAL DI MICITIATIN
Improvements in or connected with Lifts, Hoists, and analogous
Machinery.
We, CHARLES MUSKER and ARTHUR MUSKER, both of Dundas Street,
Bootle, in the County of Lancaster, Hydraulic Engineers, do hereby declare the
nature of this invention to be as follows:-
This invention has reference, mainly, to hydraulic lifts, hoists, or analogous
machinery, wherein the power applied is automatically regulated or adjusted or
controlled or partly so-according to the load or weight upon the cage (or its
equivalent) of the lifts or boists to be elevated or raised, by or through such load
or weight; and wherein the well known balancing-cylinder arrangement or method
of working is used; the actual power to lift or raise the apparatus being applied
by two or more powers or power cylinders, through the balancing cylinder.
An illustration of the type of apparatus in connection with which the improve-
ments under this invention, or any of them; may be used with advantage, is set
forth in the Specification of an Application for Patent by us of the 5th December,
1893, namely, No. 23343.
According to the present invention, in lifts, hoists, or like apparatus, where
variable powers are adapted to be applied automatically-or partly automatically
and partly mechanically,-by and due to the different or varying loads on the lift
or the like, all the powers, as two or more, are adapted to be automatically applied
at the starting of the apparatus, whereby a speedy and an assured start is obtained;
and in the case where the load is less than that which would cause the maximum
power to be applied, power from one or more of the power cylinders, as the case
may be, will be automatically cut off as soon as the apparatus has started.
As an illustration of this mode of operation; in the application of onr improve-
ments to apparatus such as described in the Specification of our said prior
Application No. 23343 of 1893, wherein a hydraulic cylinder and ram is adapted
to work in connection with an automatic valve, and a plurality of powers or power
cylinders and rams are used, the said hydraulic ram connected with the automatic
valve, is adapted to apply all the powers by admitting pressure water to said
cylinder upon the lift being stopped, or before the starting, whereby it is moved
to the extremity of its stroke, so putting all the power cylinders in commu-
nication with the pressure water; while upon the commencement of the rise or
lifting, the said cylinder is put in communication with the lift cylinder, and if the
load on the lift is less than that requiring full power, the pressure on the ram will
be less than that of a weight connected with or acting against it said ram,—and
pressing it in the opposite direction, whereby the ram would be drawn back, and
accordingly as the amount of the load, one or more powers will bo cut off, auto-
matically. In the case of there being several powers, as two or more, to he
worked by the automatic valve, a weight picking up means would be used in
connection with the apparatus to control the intermediate power or powers.
Or, as a modification, a weight or weights acting upon the ram may be released
or caught, to affect this end, which constitutes a converse action and arrangement.
In hydraulic lifts or the like where variable powers are used and controlled by
an automatically operated valve, such valve is adapted to supply pressure water to
one or more power cylinders, and at the same time to admit water from an exhaust

page_text: tank or the like into a power cylinder or cylinders, in or by which idle strokes are
being performed, thereby doing without non-return or other special valves in
connection with the distribution of water to and from the cylinders. In one
arrangement of valve by which this is effected, in the valve there are two ports,
one of which is adapted to make communication with the ports through which
the flow of the power water to and from the cylinders is effected, while the other
is adapted to make communication between an exhaust tank or the like and one
or other cylinders in or by which idle strokes is or are being performed.
In the case of hydraulic apparatus where the first power cylinder is controiled
by a valve actuated by hand, and one or more power cylinders are controlled
automatically by a valve actuated by a hydraulically operated device, such as
referred to, the hand valve is adapted to admit pressure water to the first power
cylinder and to a port in the automatic valve, and so to another power cylinder or
other cylinders controlled thereby; and thus when the hand valve cuts off supply
to the first cylinder, it cuts it off from the other or others at the same time. In
this case also the valve controlling the first cylinder may also control the action of
the hydraulic device cylinder, and put it in and out of communication with the
lift cylinder and the pressure water.
The improvements under this invention may be applied separately or conjointly
in lifting or hoisting machinery ; and to kinds of such machinery, other than that
or those herein more particularly referred to..
Dated this 2nd daring A1004
:
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15 Water Street, Liverpool, Applicants' Patent Agents.
:
Improvements in or connected with Lifts, Hoists, and analogous
Machinery.
We, CHARLES MUSKER and ARTHUR MUSKER, both of Dundas Street,
Bootle, in the County of Lancaster, Hydraulic Engineers, 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 has reference, mainly, to hydraulic lifts, hoists, or analogous
machinery, wherein the power applied is automatically regulated or adjusted or
controlled or partly so-according to the load or weight upon the cage (or its
equivalent) of the lifts or hoists to be elevated or raised, by or through such load
or weight, and wherein the well known balancing cylinder arrangement or method
of working is used; the actual power to lift or raise the apparatus being applied
by two or more powers or power cylinders, through the balancing cylinder.
!!
An illustration of the type of apparatus in connection with which the improve-
ments under this invention, or any of them, may be used with advantage,
is set forth in the Specification of an Application for Patent by us of the
5th Dceember, 1893, No. 23343.
.
According to the present invention, in lifts, hoists, or like apparatus, where
variable powers are adapted to be applied automatically-or partly automatically
and partly mechanically, by and due to the different or varying loads on the lift
or the like, all the powers, as two or more, are adapted to be automatically
applied at the starting of the apparatus, whereby a speedy and assured start is
obtained; and in the case where the load is less than that which would cause the
maximum power to be applied, power from one or more of the power cylinders, as
the case may be, will be automatically cut off as soon as the apparatus has started.
As an illustration of this mode of operation, in the application of our improve-
ments to apparatus such as described in the Specification of our said prior
:.

page_text: Application No. 23343 of 1893, wherein a hydraulic cylinder and ram is anapred
to work in connection with an automatic valve, and a plurality of powers or power.
oylinders and rams are used, the said hydraulic ram connected with the automatic
valve is adapted to apply all the powers by admitting pressure' water to said
cylinder upon the lift being stopped, or before the starting, whereby it is moved to
the extremity of its stroke, su putting all the power cylinders in communication
with the pressure water; while upon the commencement of the rise or lifting, the
Baid cylinder is put in communication with the lift cylinder, and if the load on the
lift is less than that requiring full power, the pressure on the ram will be less than
that of a weight connected with or acting against it said ram-aud pressing it in
the opposite direction, whereby the ram would be drawn back, and, accordingly as
the amount of the load, one or more powers will be cut off, automatically. In the
case of there being several powers, as two or more, to be worked by the automatic
valve, a weight picking up means is used in connection with the apparatus to
control the intermediate power or powers. Or, as a modification, a weight or
weights acting upon the ram may be released or caught, to effect this end, which
coustitutes a converse action and arrangement.
In bydraulic lifts or the like where variable powers are used and controlled by
an automatically operated valve, such valve is adapted to supply pressure: water to
one or more power cylinders, and at the same time to admit water from an exhaust
tank or the liko into a power cylinder or cylinders, in or by which idle strokes are
being performed, thereby doing without non-return or other special valves in
connection with the distribution of water to and from the cylinders. In one
arrangement of valve by which this is effected, in the valve there are two ports,
one of which is adapted to make communication with the ports through which the
flow of the power water to and from the cylinder is effected, while the other is
adapted to make communication between the exhaust tauk or the like and one or
other of the cylinders in or by which idle strokes is or are being performed.
In the case of hydraulic apparatus where the first power cylinder is controlled
by a valve actuated by hand, and one or more power cylinders are controlled
automatically by a valve actuated by a hydraulically operated device, such as.
referred to, the hand valve is adapted to admit pressure water to the first power
cylinder and to a port in the automatic valve, and so to another power cylinder or
other cylinders controlled thereby; and thus when the hand valve cuts off the
supply to the first cylinder, it cuts it off from the other or others at the same time.
In this case also the valve controlling the first cylinder may also control the action
of the hydraulic device cylinder, and put it in aud out of communication with the
lift cylinder and the pressure water.
The improvements under this invention may be applied separately or conjointly
in lifting or hoisting machinery; and to kinds of sucli machinery, other than that
or those herein more particularly referred to.
Drawings illustrative of the improvements above specified are hereto annexed.
Figures 1 to 6 show one arrangement or modification under this invention for a
three-power lift; and Figures 7 to 9 other modifications.
Regarding the machinery shewn in Figures 1 to 6, which will be first described;
Figure 1 is a plan in section through the valve chest shewing the valves;
Figure 2 is a plan shewing the arrangement of ports in the face of the chest ;.
Figure 3 is a longitudinal section taken through the automatic valve and valve
chest; Figure 4 is a longitudinal section taken at the line CC Figure 2; and
Figura is a cross section at A. A Figure 1.
Figure 6 is an elevation shewing the hydraulic actuating ram and the weight
picking up mechanism for the intermediate cylinder.
Referring in the first instance to these figures, a is the casing in which the valves
are disposed and work, that is, the hand actuated and automatically operated
valves, aud is the lower part of the apparatus in which the ports controlled by
the valves, and water passages, are provided, 61 being a flange by which these parts
are fixed on the base is shewn in Figure 6. c is the hand actuated valve controlling
i

page_text: the flow of water to and from the primary power apparatus, say cylinder of a lift,
which will hereafter be called the first-power cylinder. is the automatically
operated or controlled valve. e is the lever by which the valve d is controlled and
operated, said lever being mounted on a pine and connected with the valve d by
its spindle d. is the hydraulic ram by which the actuation or control of the
levere and the automatic valve d are effected. g is the cylinder of the ram f, with.
which, communication with the lift ram cylinder and the main is made and broken.
as hereafter described, and the pressures of water existing there applied to the
ram : The cylinder g is mounted on the base i. is a weight by which the
return stroke of the ram is effected, said weight being connected with the ram / by
the rod *; and are rollers mounted on the ram, one of which works in
connection with the lover e.
Referring to the non-automatic valve c, this is operated by hand from the lift
operating rope in any suitable way, as by the lever arrangement shewn in our said
former Specification, the valve being connected to the same by the spindle c**.
is
For effecting the control and operation of the automatic valve.d, with regard to
the intermediate cylinder, that is the second power cylinder, the weight
provided; and this weight is in action picked up by the rod * when the ram falls.
The rod has a boss or tappet 1 upon it, which acts upon the lever p-fulcrumed
at pin the downward stroke of the ram, the lever being supported by the
suspended stop, when the ram f is in its top position.
As regards the valve ports etc., the valve c (see Figures 1, 2, 3, 4 and 5) works
in connection with the ports ele, in the base b, which are the ports controlling the
supply to, and discharge from, the first cylinder, also the second and third power
cylinders, and also ports c c which control the flow of water to and from the
cylinder g of the hydraulic controlling device. The supply port e extends through
the part to the branch c, which will be connected with the said first power
cylinder; whilst the port c is the exhaust port and. extends to the exhaust
branch, which is common to both valves. The small port extends to the
branch c, which will be conuected with the cylinder g by a small pipe-not shewn ;
and the port et extends to the branch e', which will be connected with the lift
cylinder.
With respect to the valve d, and the port it controls, d' is a port of the said
valve, through which the supply to the second and third power cylinders passes,,
and also returns when exhausting; while d is a port therein through which
water is supplied to one or both of the power cylinders in their idle strokes, such
water being supplied from and also returned to a suitable tank or vessel, as usual,
The port in the part 6 conveys water from the supply port e to the port d' of the
valve d; and the ports d' and d convey said water from the port to the second
and third power cylinders, respectively, these ports being extended through the
part 6 to the branches d and respectively, which will be connected with said
power cylinders by pipes; while d is a port conveying water from and to the
port d of the valve d, to and from the exhaust branch in the idle strokes.
o. is the brauch (see Figure 2), and o¹ is a port connected with same, in the part 1,
by which the pressure water is admitted into the valve casing a.
In action, assuming the lift or elevator to be at rest, and the supply port c' to the
first power cylinder closed by the valve c, in this position, the port will not be
covered by the valve c, i.e. it will be open to the interior of the casing a, and the
pressure water from the service main or supply will therefore be admitted to the
cylinder g, by way of such port c, and the branch of, and the pipe connecting it
with the cylinder g, and will act upon the ram and force it to the outer end of its
stroke; the weight lever p with its weight then resting on the support i'. In and
by this stroke one of the rollers h³, acting on the side of the end of the lever e, will
have moved same, and so moved the valve d to the position shewn in Figure 3, that
is to a position in which both ports d' and d³, connected with the second and third
power cylinders, are opened to the supply port c', by the valve port d; but the
port e being covered by the valve c, no pressure water can flow to same or the 2nd

page_text: the
and 3rd power cylinder ports d and d. When, however, the valve c'uncovers the
port in starting the lift, pressure water can flow to all the said power cylinders;
and the said cylinders thereby being supplied with water, a suro and speedy start is
obtained. In starting the lift upon receiving a load, by the rope or other usual
means, the valve c being thereby moved, the port is covered and closed by the
valve, and is put in connection with the port connected with the cylinder g, by
passage cx (see Figures 1, 2, and 5) of the valve r. The elfect of this is that,
at the start, pressure water is supplied to the three power cylinders by way of the
ports c, d (in the valve d), d, and do, and the branches c, d, and d', while the
cylinder is instantaneously upon starting put in communication with the lift
cylinder by the branch e, port e, valve port c*, port ³, and branch c. Thus
according to the load on the lift, so will be the pressure of water in the cylinder,
which is in connection with it; and if this load is less than that by which all three
power cylinders, or the second and third power cylinders, are adapted or arranged
to come into action, the ram will be pressed back by the weight h; and the
rollers will thereby leave the lever e, and so the valve d will be free to be pressed
outwards by the pressure water acting on the end of its spindle d*, and will be so
pressed outwards; by which movement one or both of the ports will be cut off
from the service supply water through the port d³, and put out of action one or
both of the power cylinders. The stroke, therefore, of this cylinder or these
cylinders, will be idle, and they will be filled through the ports do and with water
from a suitable vessel or tank to which the exhaust flows by way of the port c³:
As to whether one or both the third and second power cylinders is or are put out of
action, this depends upon the amount of the load, and is adjusted, self-actuated, and
governed as follows:-As the ram is moved downwards by the weight h, the
weight comes into action and acts as a contra force to this weight h, and in effect
becomes added to that of a lower pressure, pressing on the end of the ram f. The
action of the weight is, that as the ram moves downwards the weight is lifted
by the boss first coming into contact with the lever p; and if the load on the
lift is such that the pressure in the cylinder g, acting on the end of the ram, plus
that exerted by the weight 1, is greater than that exerted by the weight / tending
to move it downwards, then the ram is brought to rest on the boss * coming into
contact with the lever p, and only the port d³ is closed to supply, and the third
power cylinder put out of action, and put in connection with the idle stroke feed-
tank or vessel. If, however, the load in the lift be still less, and the pressure on
the end of the ram f, plus that of the weight be not equal to that of the weight h,
then the weight will be lifted, and the rani f will be moved inwards to the end of
its stroke, and the valve d.will be further moved outwards by the pressure on its
spille, so as to cut off both ports d'and d from the supply port d', and both third
and second power cylinders will be put out of action, and in connection with the
feed tank. On the other hand, if the load in the lift be so great that the pressure
ing be sufficient to prevent any downward movement of the ram, then all the
power cylinders will be supplied with pressure water, and will be in action together.
Thus a perfect automatic governing actiou takes place at all times, and only so
much power and amount of pressure water is used as is needful to lift or elevate the
load in the lift.
To lower the lift, the lift rope is so moved as to cause the valve c to cover the
port c and put it in communication, by way of the valve port ex (see Figures 12
and 5), with the exhaust port c³, and to open the port to the pressure water in
the casing a; and by the closing of the port c', the supply to the port d' and second
and third power cylinders are cut off. By this reversal of the valve c, and
admission of pressure water to the cylinder g, the valve d will be moved so as to
cause the port d' thereof to put the two power cylinder ports d³ and d³ in con-
nection with the port d³, which will now become an exhaust port. Thus all the
power cylinders are opened to the exhaust by way of the port c², by way of an
exhaust tank or cistern as usual, to any suitable outfall.
As regards this specific construction of the hydraulic controlling device, it is

page_text: to be understood that in lieu of the dead weight h the power for acting as a contra
power to that or the varying power due to the varying load acting on the ram f
may be otherwise obtained; as for instance, the pressure upon the service main may
be used to act ou a piston or ram in the opposite direction to that of the varying
pressure due to the varying load, an example of which exists in the apparatus
illustrated and described in our said former Specification. Or, in lieu of using
this power direct from the service main, it may be taken from any part of the
hydraulic system or apparatus which will give the necessary power to act against
or as a contra power in the automatic hydraulic apparatus to that acting upon it
due, directly or indirectly, to the load on the lift.
In the application of this invention to cases where piston valves are used, and
wherein a triple power apparatus is employed, to employ the variable powers
according to this invention, the same mode of effecting the control and action of
the valvular apparatus in connection with the intermediate or second power
cylinder is employed, but, the piston valve being in equilibrium, and practically
without the friction of the flat valve, as shewn in the preceding figures, the
operation of the valve d through the lever e, is dispensed with, and so the ram
and the valve d are conveniently directly connected.
Illustrations of this modification are given in Figures 7, 8 and 9. In these, the
valve c, which is actuated by hand from the lift-rope, is shewn arranged in a
separate casing from the valve d, its action, however, being practically the same
as that above described. If desired, however, this valve could be placed and work
in an extended portion at one end of the casing cylinder b.
The ports, passages, and parts of these modified arrangements which are the
same as, or equivalent to, those of the arrangement above described, are marked
with the same figures and letters of reference as are used thereon, and therefore
its action will, with the following short description be understood without further
explanation, as their modes of action are substantially the same as or equivalent
to, that of that apparatus.
In the modification shewn diagrammatically in Figure 7, the valves c and d are
separate, as stated, c being operated by the lift rope ; and the apparatus in this
case is one in which the lift 2 is worked through a balancing cylinder arrange-
ment, of which 3 shews the weight, and the cylinder of which would be connected
to the cylinder 4 of the lift, by a pipe 5, which, by a branch c', is connected with
the automatic hydraulic device cylinder g. The pipes c, d, and d', are those by
which water is conveyed to and from the three power cylinders of the balance,
being that used in connection with the intermediate or second power cylinder.;
and a is a commou exhaust pipe from the valves cd and apparatus generally,
and the idle stroke supply tank above referred to. It will be seen that the
piston valve d is directly connected with f, and is of the equilibriun type having
an annular exhaust port d round it, the pipe conveying the exhaust from the
casing from this annular port being dª.
.
'
In action, when the lift is at rest, the valves and parts take the positions shewn
in the figure, the valve d and weight h being in their raised or uppermost position,
this being produced by the cylinder g having been put in communication with the
pressure water in the casing a by the pipe 8, which is uncovered by the valve c.
In this position, all three power cylinders have their pipe entrances or ports in the
cylinder b uncovered by the valve d, and therefore, when the valve c is operated,
and pressure water from its casing a admitted to the pipe c', and the casing b, all
three cylinders are at once supplied with pressure water. By this movement of
the valve c, the cylinder g is put in communication with the pipe 5 by bringing the
entrance ports of the pipes 9 and 8 into communication, similarly as by the valve c
shewn in Figures 1 to 6, thereby causing the pressure, due to the load in the lift,
in the machinery, to act upon the underside of the ram f. Then, should the load
on the lift be less than that which is necessary to cause all three powers to be used,
the pressure in the casing will be less than it would be, were the load greater,
and the velocity of the lift normal, and therefore, the weight pulls the ram ƒ and

page_text: valved down, until the weight touches the support The total dead weight
being thus relieved of the weight 1, if the pressure on -be greater than that
exerted by the weight h, the valve d will stop in this position, the third power-
cylinder having been cut off, and the second and first still left in action. If..
however, the weight hi alone, overcomes the resistance in the opposite direction
on f, then the second, as well as the third power cylinders, will be cut out; the
first being kept in action by the ram coming to the end of its stroke.
In the modification shewn in Figure 8, a modified firm, of autoniatic valvular
devico in connection with the balance lift arrangement, as shewn and described
with reference to Figure 7, is illustrated. The balance cylinder and the power
rams and cylinders are shewn in section in this case, and are generally desiguated ü.
The hollow stationary ram of the balancing cylinder--with which the lift cylindor +
'is connected' by the pipe 5-is designated 7.
с
The valvular device in this case consists of a simple piston d working in the
cylinder b, and is actuated and controlled itself by the varying pressures on the.
opposite side of it, due to the varying loads on, and the consequent increase or
decrease of velocity of the lift and the balance moving parts, and the increase or
decrease of pressure at different parts of the system connected with the valve..
In action, when the apparatus is stationary, the valve d takes the position shewu,
and all three pipes c, d, and d', connected with the three cylinders, are uncovered.
by it. Then, when the valve c is moved by the lift rope, on the lift being used,.
and pressure water admitted to the casing b, through the pipe e; by uncovering the
port of this pipe by c, pressure water is admitted to all three power cylinders.
Should, however, the load on the lift be less than that which ecessary to cause
all three powers to be used, the lift and the balancing cylinders move rapidly, and
the pressure in the casing will, in consequence, be less than it would be were the
load greater and the velocity normal; and therefore, the pressure on the opposito
end of the valve d being greater, by reason of its being supplied with pressure
water which is practically in a state of rest, as no flow of water passed it takes
place, and by the pipe from the pipe being at a point near the source of
supply, namely, the pressure water in the casing a, this pressure will move the
valve d up, and cut off one or more of the ports in 6 through which water enters.
sidle
the pipes supplying the power cylinders. Should the pressure on the upper
of the valve d, in b, be much less than that on the opposite side, then it will
cause the supply to both the third and second power cylinders, through their-
respective pipes and d to be cut off, and communication between them and the
exhaust pipe and tank a, established, by which they would be supplied with
waste or exhaust water in the rest of their idle strokes. But should the difference
of pressure be such that only the third power cylinder should be cut off, then,.
when the rod has lifted the lever p, so as to bring the plate n¹ into contact with
the weight which normally rests on the supporting edges it, the valve is stopped
by this weight, and the intermediate power cylinder pipe de is left uncovered;.
whereas, in the former action, the weight will have been overcome by the pressure
under the valve d, and it will have lifted that weight. It is arranged, as regards.
the first power cylinder, that the valve is positively stopped from closing its supply
pipe..
As regards this modification, if desired, the pipe ! could be entered into the
port face of the valve casing a, in which case, obviously, the valve c would be
adapted to supply water of full pressure to the underside of d, cut it off, and
exhaust it in the required manner.
The modification shewn in Figure 9 is the same as that set forth with reference.
to Figure 8, with the exception of the lift, which, in this case, is of the suspended
type, operated directly by ropes from triple power rams and cylinders 6, the
pressure within which, and in the upper side of the casing b, will vary according to
the varying velocities due to the varying loads. This apparatus otherwise has the
same action, and therefore the description and statements made in connection with.
the former modification.apply to this.

page_text: Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In triple power hydraulic lifts, hoists, and analogous machinery, a valvular
device or apparatus for automatically controlling the supply of pressure water to
the cylinders thereof, consisting of a hydraulic ram or piston and cylinder, connected
by conduits with suitable parts of the hydraulic machinery, and actuated upon one
side, or in one direction, by liquid, the pressure of which varies according to the
load to be lifted, directly or indirectly, and on the other by liquid taken from a
suitable part of the machinery, or by a dead weight; and a varying weight
mechanism by which the control of such apparatus, and the action and control of
the intermediate or second power cylinder, are effected; the said apparatus b
arranged and adapted to supply the full power at the starting of the lif
diminish the power subsequently, according to the load; operating substa
and for the purposes set forth.
being
1
to
as
2. In bydraulic lifts, hoists, and analogous machinery, a valvular dev.
apparatus for automatically controlling the supply of pressure water to, and a
of, triple power lifts, or the like, consisting of a hydraulic ram or piston au
cylinder connected with the lift cylinder or cylinders, and the varying pressures in
which act in connection with said hydraulic device; a valve actuated by said ram
or piston, by which pressure water to the second and third power cylinders is
caused to be supplied; a contra force means connected with said hydraulic valvular
device, adapted to aet against the said varying pressures; and weight mechanism,
substantially as described, by which the intermediate power cylinder is controlled;
the apparatus being arranged and adapted to supply the full power at the starting
of the lift, or the like, and to diminish the power subsequently, according to the
load; substantially as herein set forth and as shewn in the drawings hereto
annexed.
'
3. In multiple power lifts, hoists, or analogous machinery of the kind herein
described, a hand actuated valve provided with ports and passages, and adapted to
supply and control the flow of water of different pressures, as and when required, to
the hydraulic valvular device for operating the valve for controlling the flow of
water to and from the second and third power cylinders; substantially as herein
set forth in the description of the apparatus shown in Figures 1 to 6 of the
drawings.
4. Valvular apparatus for controlling the supply of liquid to and from multiple
power lifts, hoists, or the like, and adapted to supply pressure water to and cut it
off from the power cylinders, or some of them, automatically, by the varying loads
thereon, directly, or by pressures existing in different parts of such machinery, due
indirectly or directly to such varying loads, adapted to operate substantially as herein
set forth with reference to Figures 8 and 9 of the drawings.
5. The valvular apparatus for controlling the supply of pressure water to and
from multiple power lifts, hoists, or the like, having its parts arranged, combined,
and adapted to operate particularly as set forth with reference to Figures 1 to 6.of
the drawings.
6. Valvular apparatus for controlling the supply of liquid to and from multiple
power lifts, hoists, and the like, arranged and adapted to operate particularly as
set forth with reference to Figure 7 of the drawings.
7. Valvular apparatus for controlling and supplying liquid to and from multiple
power lifts, hoists, and the like, arranged and adapted to operate particularly as
set forth with reference to Figure 8, aud Figure of the drawings, respectively.
1002
CHEESBROUGH & ROYSTON,
15 Water Street, Liverpool, Applicant's Patent Agents..