Improvements in Hoists.
Year: 1899

page_text: Date of Application, 17th Oct., 1899-Accepted, 9th Dec., 1899
COMPLETE SPECIFICATION.
Improvements in Hoists.
A communication from abroad by THE EMPIRE ENGINE AND MOTOR COMPANY, a
Corporation organized and existing under laws of the State of New York,
and having its principal place of business in the City of Orangeburg,
Rockland County, N.Y.
I, WILLIAM LLOYD WISE, of 46, Lincoln's Inn Fields, in the County of
London, Consulting Engineer and Chartered Patent Agent, 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:-
The object of this invention is to produce an improved self-contained, power-
driven hoist, preferably of the differential pulley type.
Heretofore, hoists embodying and operating upon the principle of differential
pulleys, and the like, have been driven by hand power applied to one loop of the
chain passing around the pulleys.
By this invention, I propose, broadly, to provide means for dispensing with
the necessity of the use of hand power, and to incorporate within the hoist
mechanism, driving mechanism for operating the pulleys, and more specifically
to produce mechanism especially designed to accomplish that purpose.
In the accompanying drawings;
Fig. I is a perspective view of a single motor hoist complete:
Fig. II is a front elevation of the same, partially in section, with parts omitted:
Fig. III is a side elevation of the subject matter of Fig. II. with the plate 2
removed, the pulley shaft and valve shell being illustrated in section;
Fig. IV is a side elevation of a double motor hoist, with the chain omitted;
Fig. is a top plan view of the subject matter of Fig. IV, with the hook and
cross-head omitted, and the pulleys shown in dotted lines:
Fig. VI is a detail view of a slightly modified form of valve actuating
mechanism.
Referring to the figures on the drawings:
1 and 2 indicate two frame side pieces, which preferably consist of metal plates,
and may be of any suitable shape and dimensions adapted to do the work required
of them.
The frame, in the form illustrated, is completed by the assembling of the side
pieces with the driving mechanism, as will hereinafter more fully appear, and
is preferably provided at its upper end with a swinging cross-head 3, which carries
hook 4, by which the machine may be suspended in the manner usual with
lifferential hoists.
Near the lower ends of the plates, respectively, I provide outwardly projecting
journal supports 5 and 6, which may be secured to the faces of the plates by base
Hanges and crowns of bolts, indicated, respectively, by the common numerals 7
and S.
The journals of a pulley shaft 9 are carried within the supports 5 and 6,
espectively.
Between the side pieces 1 and 2, and separated, as by a spacing collar 10,
lifferential pulleys 11 and 12 are secured to the shaft 9.

page_text: I prefer, as specified, but do not limit myself to the employment of differential
pulleys or pulleys operating upon the differential principle.
The pulleys 11 and 12 may be of any usual or ordinary construction and carry,
in the usual manner, a chain 13, within the loop of which is supported a pulley
block 15.
The shaft 9 is also provided with means of receiving communicated power, and
is, for that purpose, provided preferably upon its opposite extremities, respec-
tively with fixed gear wheels 17 and 18.
The gears 17 and 18 mesh, respectively, with fixed pinions 19 and 20, upon
opposite ends, respectively, of the power-applying shaft 21.
As a means of driving the shaft 21, I prefer, but do not limit myself to the
employment of a fluid-actuated motor, and I show a form of motor of that descrip-
tion well known in the art, and which for that purpose does not require illustra-
tion in detail.
Suffice it to say, by way of explanation, that the shaft 21, in this instance, is
the shaft of the motor piston which is encased within the cylinder 22, and which
is supported by the shaft in suitable bearings 23 provided for it in the respec-
tive cylinder heads 24.
The shafts 9 and 21 hang in the same perpendicular plane with the cross-
head 2, and so distribute the weight evenly upon the frame of the machine, and
cause it, when suspended, to hang perpendicularly from the hook 4.
26 indicates a valve case between the interior of which and the interior of the
cylinder 22 ports 27 and 28 establish communication.
29 indicates a pipe, which may be called the fluid supply pipe and 30 another,
which may be called the fluid discharge pipe. Both communicate with the
interior of the casing 26, and one may be used as well as the other as a supply,
or as a discharge.
At a point preferably opposite the case 20, upon the cylinder 22, I provide a
lug 31 which carries a cross piece 32, that is bolted at its opposite ends to the
side pieces 1 and 2. The cross piece 32 not only serves to stiffen the frame, but
holds the cylinder and the parts connected therewith in rigidly fixed relations
with the frame side pieces.
The bore of the valve case 26 is closed by a stuffing box 33, within which works
a valve stem 34, that is provided with a double ended hollow valve 35, that works
across the ports 27 and 28, respectively.
By the shifting of the valve, pressure is supplied to one port or the other, and
converts one into a supply port, and the other into an exhaust port for the
cylinder 22. In each instance the exhaust is made through the hollow of the
valve to the pipe 30. By shifting the valve and reversing the functions of the
respective ports 27 and 28, as above described, the operation of the motor may
be reversed.
The opposite ends of the valve 55 are located so that when the valve is in the
proper position they will close both ports 27 and 28 at the same time and stop
the motor. For holding them in that position I connect the valve stem, as by
means of an arm 36 (see Fig. II) with a reciprocatory rod 37, working in suitable
apertures between opposite end plates 38, of a frame 39, secured, for instance, to
the side piece 1.
Around the rod 37 I provide coiled springs 40 and 41, set, respectively, against
the end plates 38 of the frame 39, and upon washers 42 and 43 bearing against
an intermediate block 44 secured to the rod 37 and preferably working in a
guide 44", secured to the frame 29.
When the opposing forces of the two springs are in equilibrium, the valve 35
closes the ports 27 and 28, and it is designed to work against the force of one
spring on the other, for which purpose a lever 45, pivoted as to the outside of the
side piece 1, may be connected, as by a link 46, with the rod 37, through a
· pivotally connecting member 47.

page_text: The lever 45 may be operated from the end opposite to that connected
the link 45 by a suspended rod, for example.
WILL
The foregoing description applies to Figures I to III, inclusive, which, as above
specified, relate to a single motor hoist.
In Figures IV and VI illustrate a double motor hoist by the aid whereof the
power of the hoist may be greatly increased, without materially augmenting the
weight or dimensions of the machine.
In the form of embodiment of this invention illustrated in the figures last
referred to;
51 and 52 indicate the frame side pieces of the machine, which carry upon a
shaft 53, gears 54 and 55, the shaft 53 corresponding to the shaft 9 and the
gears 54 and 55 corresponding to the gears 17 and 18, previously described.
The shaft 53, like the shaft 9, carries a pulley or pulleys, preferably differential
pulleys 56.
In place of the single cylinder 22 previously described, I provide upon opposite
sides of the frame, respectively, cylinders 57 and 58, each of which is provided
with a piston shaft that carries, respectively, pinions 59 and 60 that mesh with
the gears 54 and 55.
The weight of the multiplied cylinders is applied upon the principle of distri-
bution of the weight of the single cylinder, so as to balance the hoist from the
cross-head, or other member by which the hoist is suspended.
It will appear from the foregoing that by the employment of a plurality of
motors, the power applied to the shaft 53 may be indefinitely augmented by the
addition only of the increased weight of the motor mechanism.
Both motors are supplied with fluid pressure from a common supply pipe 61,
which communicates, through a branch pipe 62, with valve cases 63 and 64,
respectively. The valve cases 63 and 64 carry valves similar to the valves 35, and
do not, therefore, require further illustration.
i5 indicates one valve stem and 66 the other. They are, respectively, con-
neeted as by members 67 and 68, with a common rod 69 carried in supports 70.
The construction of the rod-actuating mechanism, and the function of the
rod with respect to the two valve stems 65 and 66, corresponds to the valve-
actuating mechanism previously described.
The side piece 52 supports a block 77 through which the rod 69 reciprocates.
The rod 69 is provided with a fixed washer 78 upon the opposite side of the
block 77 from the member 67. Between the member 67, the washer 78, and the
intermediate block 77, respectively, are provided coiled springs 79 and 80, their
respective ends next to the block 77 being preferably supported by loose washers $1
and 82 on the rod 69.
The rod 69 is operated, as by a crank 71, secured to the end of a hand rod 72,
and movably secured to the rod 69. The means of movably securing the crank 71
to the rod 69, although not of special importance, may be the form of mechanism
illustrated at 73 in Figures IV and V, in which the end of the crank 71 is
bifurcated and carries pins working between collars on the rod (9, or, as illus-
trated in Fig. VI, a crank 74 may be substituted for the crank 71, and may be
connected, as to its outer extremity with the rod 69, by an intermediate link 75,
pivoted, as indicated at 76, to the end of the crank 74.
As intimated in the general statement contained in the first part of this speci-
fication, I do not intend in practice to limit myself to the precise details of con-
struction herein described and illustrated, but reserve to myself the right to
modify and vary them at will within the scope of this invention, as may be
dictated by the preference and skill of the mechanic.
Having thus fully described and ascertained the nature of this said invention
and in what manner the same is to be performed, I declare that what I claim is :-
1. A self-contained hoist comprising a frame fixedly suspensible from a single

page_text: point, as by means of a cross-head, a pulley, and a motor operatively connected
with the pulley and both carried by said frame.
2. A self-contained hoist comprising a suspensible frame, differential pulleys,
and a motor operatively connected with said pulleys, and both carried by said
frame.
3. In a hoist, the combination with a suspensible frame comprising side pieces,
a shaft, differential pulleys secured to the shaft between the side pieces, and
gears secured to the shaft on opposite sides of the pulleys, respectively, of a motor
carried between the side pieces, its shaft mounted therein, and pinions upon
said shaft meshing with the gears upon the pulley shaft, substantially as set forth.
4. In a hoist, the combination with a frame suspensible from a single point,
as by a cross-head, a pulley-shaft, and pulley, of one or more motors and motor
shaft or shafts operatively connected with the pulley shaft, the several parts being
so arranged, with respect to the frame, as to equally distribute the weight of the
machine upon the frame, substantially as set forth.
5. The combination of frame side pieces, pulley shaft, pulley thereon, motor,
motor shaft operatively connected with the pulley shaft, and means of suspension,
said means of suspension, motor shaft, and pulley shaft being located so as to
hang in practice in the same vertical plane, and thereby equally distribute the
weight of the machine, substantially as set forth.
6. In a hoist, the combination with a frame, pulley shaft and pulley thereon,
of a plurality of motors and their shafts, and means for operatively connecting
the pulley shaft with the motor shafts, respectively, substantially as set forth.
7. The combination with a hoist comprising a frame, a fluid motor and its shaft,
a pulley shaft and pulley thereon operatively connected with the motor shaft,
of a valve case provided with a pair of ports communicating with the interior
of the motor cylinder, and a valve adapted to convert either of the ports into a
supply or a discharge port, substantially as set forth.
8. The combination with a hoist comprising a frame, a fluid motor and its shaft,
a pulley shaft and pulley thereon operatively connected with the motor shaft, of
a valve case provided with a pair of ports communicating with the interior of
the motor cylinder, and a spring-balanced valve adapted to convert either of the
ports into a supply or discharge port, substantially as set forth.
9. The combination with a hoist comprising a frame, pulley shaft, pulley
thereon, and a plurality of fluid motors provided with shafts operatively con-
nected with the pulley shaft, of a common fluid pressure supply pipe operatively
communicating with the motors, reversing valves operatively located between the
supply pipe and the respective motors, and common means for actuating the
valves, substantially as set forth.
10. The combination with a hoist comprising a frame pulley shaft, pulley
thereon, and a plurality of fluid motors provided with shafts operatively con-
nected with the pulley shaft, of a common fluid pressure supply pipe operatively
communicating with the motors, spring-balanced valves operatively located
between the supply pipe and the respective motors, and common means for
actuating the valves, substantially as set forth.
Dated this 17th day of October 1899.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.