Improvements in or appertaining to Elevators or Hoisting Machines.
Year: 1897

page_text: [Communicated from abroad by TILE FRASER ELECTRIC ELEVATOR COMPANY, 610,
Market Street, of the City and County of San Francisco, in the State of
California, one of the United States of America, Manufacturers.]
Improvements in or appertaining to Elevators or Hoisting Machines.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord Street,
Liverpool, and 6, Bank Street, Manchester, both in the County of Lancaster, and
Lower Temple Street, Birmingham, in the County of Warwick, Civil Engineer,
do hereby declare the nature of this invention to be as follows:-
-
This invention relates to hoisting-machines, and the object thereof is to provide
for such machines a mode of construction wherein it is not required to start, stop,
and reverse the motive power as often as there is a load to raise or lower, that is to
say a construction in which the actuating mechanism is so made, arranged, con-
nected and combined that the same may run continuously whether the load is
moving or standing still, thereby avoiding the noise, jar, friction and waste of
power occasioned where the motive force has to be started, stopped, and reversed
every time a load is lifted or let down.
To carry out the said invention two driving pulleys are used, which rotate
independently of each other and are so arranged with the motive power and
mechanism which operate them that they may both be driven at one and the same
rate of circumferential speed, or the rate of the circumferential speed of either
one of them may be changed at any moment so that it will run either faster or
slower than the rate of circumferential speed of the other. An endless rope or its
equivalent passes around both of said driving pulleys and is connected, either
directly or indirectly, with the car, cage, or platform or other weight which is
to be raised or lowered. A travelling pulley attached to the said car, cage or
platform is used when the connection of the rope is made directly with the car,
cage or platform. The said driving pulleys and the motors and mechanism which
drive them and the said rope are so constructed, combined and arranged that each
of them will continue to run in one direction without stopping or reversing its
motion while the car, cage or platform will either be held stationary or will be
moved upwards or downwards as desired. When the circumferential speed of the
two driving pulleys is the same the car, cage or platform will remain stationary.
When it is desired to move the car, cage or platform upwards or downwards the
rate of circumferential speed of one of the driving pulleys will be either increased
or diminished so as to be either faster or slower than that of the other when the
load will be moved either upwards or downwards according to which one of the
driving pulleys is given the greatest circumferential velocity.
The elevator is operated by changing as occasion requires the relative rate of

page_text: speed at which the different parts of the endless rope run, and this is accomplished
by changing the relative rates of speed at which the circumferences of the driving
pulleys run. The endless rope moves the load, and is driven by its contact with
the circumferences of the driving pulleys. The particular part of the endless
rope that is passing around either of the driving pulleys runs at the same rate
of speed at which the circumference of the driving pulley runs with which it is
in contact. For this reason the term "circumferential speed" is used, which in
these specifications means the speed at which the circumferences of the driving
pulleys run.
The said driving pulleys may be driven by steam, water, electricity or any
other suitable power. No claim is made to any specific power or means for driving
said driving pulleys. One kind of power may be used for driving one of the
driving pulleys and another kind of power may be used for driving the other
driving pulley. Means and methods for driving such driving pulleys are so
numerous and so well and commonly known to mechanics that it is not necessary
to describe any of them in these specifications in order to enable any ordinary
mechanic to construct and operate the elevators therein described.
Referring to the drawings hereunto annexed which form an integral part
hereof,
Figure 1 is a side elevation of an elevator or hoisting machine which shows
one of the simplest combinations of mechanical elements in which the said inven-
tion can be embodied.
Figure 2 is a similar view, but showing a sprocket chain instead of a rope and
weight.
Figure 3 is a side elevation of an elevator that is built with a larger combina-
tion of mechanical elements than is contained in either of Figures 1 or 2.
Figure 4 is an edge view of the elevator shown in Figure 3.
Figure 5 is a perspective view of an elevator which shows the invention embodied
in a still more extensive combination of mechanical elements than is shown in
either of the other figures.
In all the figures similar letters of reference refer to corresponding parts.
In Figure 1, A represents the car, cage, platform or other weight that is to
be raised or lowered. B and C are two driving pulleys, each of which rotates
independently of the other, and each of which is driven by any of the methods
already well known to the mechanical world for driving power transmitting
pulleys, and changing and regulating their velocity at pleasure, and which need
no description here. D is an endless rope that passes around both of the driving
pulleys and also around travelling pulleys E and Y. E is a travelling pulley
that carries the car, cage or platform A which is attached thereto. Y is another
travelling pulley that carries a weight W which is attached thereto. The travel-
ling pulley E is carried in the loop or bight of the endless rope at one of its
extremities, and the travelling pulley Y is carried in the loop or bight of the end-
less rope at its opposite extremity, as shown. The weight W is necessary for the
purpose of securing frictional contact of the endless rope with the peripheries of
the driving pulleys B and C and thereby prevent its slipping thereon. The
weight W to the extent of its own gravity will act as a counterweight to the load
that is carried in the other bight or loop of the endless rope, and may be made
as heavy as desired for such purpose.
The operation of the elevator shown in Figure one is as follows, viz.: The
driving pulleys are set in motion in the directions shown by the arrows. While
they are both travelling at the same rate of circumferential speed the endless rope
will run throughout its entire length at one and the same uniform rate of speed
and the load A will not be moved in either direction but will remain stationary.
To raise the load A, either the circumferential speed of the driving pulley B is
increased or else the circumferential speed of the driving pulley C is decreased.
In either case the part of the rope that is running over the driving pulley B will
run faster than that part of the rope which is running over the driving pulley C.

page_text: This change in the relative circumferential speed of the driving pulleys will
cause the load A to be drawn upwards, and the weight W at the opposite extremity
of the rope will descend by its own gravity. By reversing the relative circum-
ferential speed of the driving pulleys the load A will descend by its own gravity
and the weight W will be drawn upwards.
It is evident that the driving pulleys may be run in directions opposite to those
shown by the arrows, in the drawings; also the direction of motion of either of
the driving pulleys with reference to each other may be changed by crossing the
rope and passing it around one of the driving pulleys in an opposite direction
from that shown in the drawing, and the operation of the elevator will remain
substantially the same.
Figure 2 shows a combination that is similar to that of Figure 1, except that
instead of a rope it shows an endless flexible chain of the kind known as machine
chains, in which the links are all made of one uniform size, and except also that
the grooves in the circumferences of the driving pulleys B and C are made of the
proper form to carry said chain, and with depressions in then of the proper sizes
and forms to receive said links and prevent the chain from slipping in the grooves.
The chain and driving pulleys operate the same as sprocket wheels with sprocket
chains operate, and are devices of ordinary construction which are well understood
by mechanics generally. No tension weight is required in the construction
shown in Figure 2, as the weight of the chain is sufficient to keep it in its place
without any further weight being added to it. In other respects the operation
of the elevator shown in Figure 2 is the same as that of the elevator shown in
Figure 1.
Figures 3 and 4 show a different combination of parts from what is shown in
either Figure 1 or 2. In Figures 3 and 4 the weight W is dispensed with, and
a rope is attached at one end to the travelling pulley Y and at its other end
to the load A. The rope F passes around a stationary pulley G, which is held
by a device H that is bifurcated at its upper part to receive the pulley G, and is
formed into a screw bolt at its lower part. The screw part of this device passes
through a fixed bracket and is secured to the bracket by a nut that is fitted thereon
as shown. This device that carries the pulley G may be drawn downwards by the
screw and nut thereon and it thereby serves as a tension apparatus for holding
taut the ropes D and F.
In said Figures 3 and 4 are also shown means for obtaining additional frictional
adhesion of the endless rope to the driving pulley C, which are as follows, viz.:
The driving pulley C is made with several grooves in its periphery for the end-
less rope to run in. An additional pulley J, having the same number of grooves
less one for the same rope to run in, is placed as shown. The endless rope runs around
both the pulleys C and J in the several grooves that are in their peripheries, and
thereby additional frictional adhesion to the driving pulley is obtained for the
rope. This is a well-known method of obtaining additional frictional adhesion for
power transmitting ropes and cables and the same is not claimed except as one
of the mechanical elements used in the new combinations which have been formed
in creating the new elevators described herein. This additional pulley for obtain-
ing more friction has been shown as applied only to the driving pulley C, but it
can be applied in the same manner to the other driving pulley B without further
invention. The arrangement of Figures 3 and 4, it will be understood, would be
quite as operative if entirely reversed, as may be seen by turning these two views
upside down.
Figure 5 is a perspective view of an elevator embodying the invention in another
and more extended form. It is composed of the frame P, two driving pulleys B and C,
a platform car A, a counterweight W, two stationary friction pulleys G and M, one
rope or set of ropes L passing over the stationary friction pulley M
and connecting the counterweight to the car, another set of ropes F that pass over
the stationary friction pulley G and connect the counterweight with the tighten-
ing or tension apparatus N, two travelling pulleys E and Y, the first of which is

page_text: attached to the counterweight W and the other of which is attached to the
tightening apparatus N, and an endless rope or set of ropes D, which pass around
both of the said two driving pulleys and also around both of said travelling pulleys.
In this elevator the tightening apparatus has been placed between the ends of the
ropes F and the travelling pulley Y. Instead of this it is preferred to place the
tightening or tension device between the upper stationary pulley G and the timber
or other object to which said pulley is secured to hold it in place. In such case
a simple bolt and nut constructed as shown at H in Figures 3 and 4 are sufficient.
There are many forms of tightening and tension devices well known to mechanics,
many of which may be substituted in place of the particular form of tension
device that is shown in said Figure 5. No claim is therefore made to the particular
form of tension device that is shown in Figure 5. Indeed, it is entirely practic-
able to construct and operate the elevator without any tension device whatever
in it, although it is preferred to use some form of tension apparatus and a tension
device of one form has therefore been shown in said Figure 5. The particular
form of tension device shown in Figure 5 is constructed as follows, viz.: Two
vertical rods with screws cut their entire lengths are made. Each one of these
vertical rods passes through three cross bars near the respective ends of the latter.
The cross bars are held in their proper positions by nuts that work up and down
on said screw rods. One of said cross bars is near the upper ends of the said
screw rods, and another of the cross bars is near the bottoms of the two screw rods.
The third cross bar is placed on the screw rods between the upper and lower cross
bars. This third cross bar has nuts both above and below it by means of which
it may be moved upwards and downwards along said screw rods. The rope or
ropes F pass downwards through the upper cross bar and are fastened to said
third cross bar. The travelling friction pulley Y is fastened by a bracket to the
said lower cross bar. By forcing the said third cross bar downwards the rope or
ropes F, and the endless rope or ropes D, will be tightened and their tension
increased, while by raising the said third cross bar upwards the same ropes will
be slackened. By connecting the end of the rope or set of ropes F directly to the
travelling pulley Y, in Figure 5, the operation of the elevator will be the same,
except as to the tension of the ropes F and D, when the tension device is left
entirely out as it is when the tension device is put in as shown in said figure. By
making the tension apparatus in the form shown in Figure 5 the ends of the cross
bars may be formed so as to run in, or upon, vertical guides in the frame and
thereby keep the line of movement of the tension apparatus and the travelling
pulley Y, connected thereto, in the exact position desired for obtaining the most
perfect operation.
In Figure 5 are shown three sets of ropes. Each one of the said sets contains
more than one rope. By this arrangement the ropes of each set reinforce cach
other and thereby furnish additional strength. There are as many grooves in
the driving pulleys for the ropes to run in as there are ropes, and thereby great
additional frictional adherence of the endless ropes to the driving pulleys is
obtained. Where, however, the elevator is so light that a single rope will do
the work required of each one of the sets of ropes a single rope may be used in
place of each one of said sets of ropes, without any change being made in the
invention or in the operation of the elevator. By the construction and arrange-
ment of the parts shown in said Figure 5 the elevator platform is connected to
the counterweight alone. In this Figure 5 the platform is not directly connected
with either the endless rope or ropes, or with the travelling pulleys or with the
driving pulleys. The load is connected with, and is operated by, the counter-
weight alone. By preference the counterweight is made to overbalance the plat-
form A by about one-half the weight of an ordinary load that is to be carried by
said platform. When the counterweight is drawn downwards it draws the plat-
form A and its load upwards. When the counterweight is drawn upwards by
the rope or ropes F the platform descends by reason of its own gravity alone. The

page_text: elevator shown in said Figure 5 is, it is believed, one of the best and most practic-
able forms of elevator in which the said invention can be embodied.
Tath 15th day of M 1907
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C.,
Patent Agents for the Applicant.
Improvements in or appertaining to Elevators or Hoisting Machines.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord Street,
Liverpool, and 6, Bank Street, Manchester, both in the County of Lancaster, and
Lower Temple Street, Birmingham, in the County of Warwick, Civil 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 hoisting-machines, and the object thereof is to provide
for such machines a mode of construction wherein it is not required to start, stop,
and reverse the motive power as often as there is a load to raise or lower, that is to
say a construction in which the actuating mechanism is so made, arranged, con-
nected and combined that the same may run continuously whether the load is
moving or standing still, thereby avoiding the noise, jar, friction and waste of
power occasioned where the motive force has to be started, stopped, and reversed
every time a load is lifted or let down.
To carry out the said invention two driving pulleys are used, which rotate
independently of each other and are so arranged with the motive power and
mechanism which operate them that they may both be driven at one and the same
rate of circumferential speed, or the rate of the circumferential speed of either
one of them may be changed at any moment so that it will run either faster or
slower than the rate of circumferential speed of the other. An endless rope or its
equivalent passes around both of said driving pulleys and is connected, either
directly or indirectly, with the car, cage, or platform or other weight which is
to be raised or lowered. A travelling pulley attached to the said car, cage or
platform is used when the connection of the rope is made directly with the car,
cage, or platform. The said driving pulleys and the motors and mechanism which
drive them and the said rope are so constructed, combined, and arranged that each
of them will continue to run in one direction without stopping or reversing its
motion while the car, cage, or platform will either be held stationary or will be
moved upwards or downwards as desired. When the circumferential speed of the
two driving pulleys is the same the car, cage, or platform will remain stationary.
When it is desired to move the car, cage, or platform upwards or downwards the
rate of circumferential speed of one of the driving pulleys will be either increased
or diminished so as to be either faster or slower than that of the other when the
load will be moved either upwards or downwards according to which one of the
driving pulleys is given the greatest circumferential velocity.
The elevator is operated by changing as occasion requires the relative rate of
speed at which the different parts of the endless rope run, and this is accomplished
by changing the relative rates of speed at which the circumferences of the driving
pulleys run. The endless rope moves the load, and is driven by its contact with
the circumferences of the driving pulleys. The particular part of the endless

page_text: rope that is passing around either of the driving pulleys runs at the same rate
of speed at which the circumference of the driving pulley runs with which it is
in contact. For this reason the term "circumferential speed" is used, which in
these specifications means the speed at which the circumferences of the driving
pulleys run.
The said driving pulleys may be driven by steam, water, electricity, or any other
suitable motive power. No claim is made to any specific power or means for driving
said driving pulleys. One kind of power may be used for driving one of the
driving pulleys and another kind of power may be used for driving the other
driving pulley. Means and methods for driving such driving pulleys are so
numerous and so well and commonly known to mechanics that it is not necessary
to describe any of them in these specifications in order to enable any ordinary
mechanic to construct and operate the elevators therein described.
Referring to the drawings left with the Provisional Specification,—
Figure 1 is a side elevation of an elevator or hoisting machine which shows
one of the simplest combinations of mechanical elements in which the said inven-
tion can be embodied.
-
Figure 2 is a similar view, but showing a sprocket chain instead of a rope and
weight.
Figure 3 is a side elevation of an elevator that is built with a larger combina-
tion of mechanical elements than is contained in either of Figures 1 or 2.
Figure 4 is an edge view of the elevator shown in Figure 3.
Figure 5 is a perspective view of an elevator which shows the invention embodied
in a still more extensive combination of mechanical elements than is shown in
either of the other figures.
In all the figures similar letters of reference refer to corresponding parts.
In Figure 1, A represents the car, cage, platform or other weight that is to
be raised or lowered. B and C are two driving pulleys, each of which rotates
independently of the other, and each of which is driven by any of the methods
already well known to the mechanical world for driving power transmitting
pulleys, and changing and regulating their velocity at pleasure, and which need
no description here. D) is an endless rope or cable that passes around both of the
driving pulleys and also around travelling pulleys E and Y. E is a travelling pulley
that carries the car, cage, or platform A which is attached thereto. Y is another
travelling pulley that carries a weight W which is attached thereto. The travel-
ling pulley E is carried in one of the loops or bights of the endless rope, and the
travelling pulley Y is carried in another loop or bight of the said rope, as shown.
The weight W is necessary for the purpose of securing frictional contact of the
endless rope with the peripheries of the driving pulleys B and C and thereby pre-
vent its slipping thereon. The weight W to the extent of its own gravity will
act as a counterweight to the load that is carried in the other bight or loop of the
endless rope, and may be made as heavy as desired for such purpose.
The operation of the elevator shown in Figure one is as follows, viz.: The
driving pulleys are set in motion in the directions shown by the arrows. While
they are both travelling at the same rate of circumferential speed the endless rope
will run throughout its entire length at one and the same uniform rate of speed
and the load A will not be moved in either direction but will remain stationary.
To raise the load A, either the circumferential speed of the driving pulley B is
increased or else the circumferential speed of the driving pulley C is decreased.
In either case the part of the rope that is running over the driving pulley B will
run faster than that part of the rope which is running over the other driving
pulley C. This change in the relative circumferential speed of the driving pulleys
will cause the load A to be drawn upwards, and the weight W will descend by its own
gravity. By reversing the relative circumferential speed of the driving pulleys
the load A will descend by its own gravity and the weight W will be drawn
upwards.

page_text: It is evident that the driving pulleys may be run in directions opposite to those
shown by the arrows, in the drawings; also the direction of motion of either of
the driving pulleys with reference to each other may be changed by crossing the
rope and passing it around one of the driving pulleys in an opposite direction
from that shown in the drawing, and the operation of the elevator will still remain
substantially the same.
Figure 2 shows a combination that is similar to that of Figure 1, except that
instead of a rope it shows an endless flexible chain of the kind known as machine
chains, in which the links are all made of one uniform size, and except also that
the grooves in the circumferences of the driving pulleys B and C are made of the
proper form to carry said chain, and with depressions in them of the proper sizes
and forms to receive said links and prevent the chain from slipping in the grooves.
The chain and driving pulleys operate the same as sprocket wheels with sprocket
chains operate, and are devices of ordinary construction which are well understood
by mechanics generally. Any suitable chains and driving pulleys may be em-
ployed for operating the elevator instead of those here shown. No tension weight
is required in the construction shown in Figure 2, as the weight of the chain is
sufficient to keep it in its place without any further weight being added to it.
In other respects the operation of the elevator shown in Figure 2 is the same as
that of the elevator shown in Figure 1.
Figures and 4 show a different combination of parts from what is shown in
either Figure 1 or 2 In Figures 3 and 4 the weight W is dispensed with, and
a rope is attached at one end to the travelling pulley Y and at its other end
to the load A. The rope F passes around a stationary pulley G, which is held
by a device H that is bifurcated at its upper part to receive the pulley G, and is
formed into a screw bolt at its lower part. The screw part of this device passes
through a fixed bracket and is secured to the bracket by a nut that is fitted thereon
as shown. This device that carries the pulley G may be drawn downwards by the
screw and nut thereon and it thereby serves as a tension apparatus for holding
taut the ropes D and F.
In said Figures 3 and 4 are also shown means for obtaining additional frictional
adhesion of the endless rope to the driving pulley C, which are as follows, viz.:
The driving pulley C is made with several grooves in its periphery for the end-
less rope to run in. An additional pulley J, having the same number of grooves
less one for the same rope to run in, is placed as shown. The endless rope runs around
both the pulleys C and J in the several grooves that are in their peripheries, and
thereby additional frictional adhesion to the driving pulley is obtained for the
rope. This is, a well known method of obtaining additional frictional adhesion for
power transmitting ropes and cables and the same is not claimed except as one
of the mechanical elements used in the new combinations which have been formed
in creating the new elevators described herein. This additional pulley for obtain-
ing more friction has been shown as applied only to the driving pulley C, but it
can be applied in the same manner to the other driving pulley B without further
invention. The arrangement of Figures 3 and 4, it will be understood, would be
quite as operative if entirely reversed, as may be seen by turning these two views
upside down.
Figure 5 is a perspective view of an elevator embodying the invention in another
and more extended form. It is composed of the frame P, two driving pulleys B and C,
a platform car A, a counterweight W, two stationary friction pulleys G and M, one
rope or set of ropes L passing over the stationary friction pulley M
and connecting the counterweight to the car, another set of ropes F that pass over
the stationary friction pulley G and connect the counterweight with the tighten-
ing or tension apparatus N, two travelling pulleys E and Y, the first of which is
attached to the counterweight W and the other of which is attached to the
tightening apparatus N, and an endless rope or set of ropes D, which pass around
both of the said two driving pulleys and also around both of said travelling pulleys.

page_text: In this elevator the tightening apparatus has been placed between the ends of the
ropes and the travelling pulley Y. Instead of this it is preferred to place the
tightening or tension device between the upper stationary pulley G and the timber
or other object to which said pulley is secured to hold it in place. In such case
a simple bolt and nut constructed as shown at H in Figures 3 and 4 are sufficient.
But the invention is not limited to the precise point at which the
tightening apparatus is placed, for its location may be varied at will.
There are many forms of tightening and tension devices well known to mechanics,
many of which may be substituted in place of the particular form of tension
device that is shown in said Figure 5. No claim is therefore made to the particular
form of tension device that is shown in Figure 5. Indeed, it is entirely practic-
able to construct and operate the elevator without any tension device whatever
in it, although it is preferred to use some form of tension apparatus and a tension
device of one form has therefore been shown in said Figure 5. The particular
form of tension device shown in Figure 5 is constructed as follows, viz.: Two
vertical rods with screws cut their entire lengths are made. Each one of these
vertical rods passes through three cross bars near the respective ends of the latter.
The cross bars are held in their proper positions by nuts that work up and down
on said screw rods. One of said cross bars is near the upper ends of the said
screw rods, and another of the cross bars is near the bottoms of the two screw rods.
The third cross bar is placed on the screw rods between the upper and lower cross
bars. This third cross bar has nuts both above and below it by means of which
it may be moved upwards and downwards along said screw rods. The rope or
ropes F pass downwards through the upper cross bar and are fastened to said
third cross bar. The travelling friction pulley Y is fastened by a bracket to the
said lower cross bar. By forcing the said third cross bar downwards the rope or
ropes F, and the endless rope or ropes D, will be tightened and their tension
increased, while by raising the said third cross bar upwards the same ropes will
be slackened. By connecting the end of the rope or set of ropes F directly to the
travelling pulley Y, in Figure 5, the operation of the elevator will be the same,
except as to the tension of the ropes and D, when the tension device is left
entirely out as it is when the tension device is put in as shown in said figure. By
making the tension apparatus in the form shown in Figure 5 the ends of the cross
bars may be formed so as to run in, or upon, vertical guides in the frame and
thereby keep the line of movement of the tension apparatus and the travelling
pulley Y, connected thereto, in the exact position desired for obtaining the most
perfect operation.
In Figure 5 are shown three sets of ropes. Each one of the said sets contains
more than one rope. By this arrangement the ropes of each set reinforce each
other and thereby furnish additional strength. There are as many grooves in
the driving pulleys for the ropes to run in as there are ropes, and thereby great
additional frictional adherence of the endless ropes to the driving pulleys is
obtained. Where, however, the elevator is so light that a single rope will do
the work required of each one of the sets of ropes a single rope may be used in
place of each one of said sets of ropes, without any change being made in the
invention or in the operation of the elevator. By the construction and arrange-
ment of the parts shown in said Figure 5 the elevator platform is connected to
the counterweight alone. In this Figure 5 the platform is not directly connected
with either the endless rope or ropes, or with the travelling pulleys or with the
driving pulleys. The load is connected with, and is operated by, the counter-
weight alone. By preference the counterweight is made to overbalance the plat-
form A by about one-half the weight of an ordinary load that is to be carried by
said platform. When the counterweight is drawn downwards it draws the plat-
form A and its load upwards. When the counterweight is drawn upwards by
the rope or ropes F the platform descends by reason of its own gravity alone. The
elevator shown in said Figure 5 is; it is believed, one of the best and most practic-
able forms of elevator in which the said invention can be embodied.

page_text: Having now particularly described and ascertained va
tion as communicated to me by my foreign correspondent, and in what manner
the same is to be performed, I declare that what I claim is: —
1. The combination, with independently-operated pulleys, of an endless rope or
cable thereon, a cage suspended from the said rope or cable, and means for driving
the said pulleys at the same or relatively-different rates of circumferential speed,
substantially as set forth.
2. An elevator having a car, cage, or platform and containing two driving
pulleys which are capable of being driven at the same and also at different relative
rates of circumferential speed, and an endless rope or cable that passes around
both of said driving pulleys and which is connected with said car, cage, or plat-
form so as to control its actions, all of said parts being so arranged and combined
that the said driving pulleys and said endless rope or cable will each run con-
tinuously in one direction and the said car, cage, or platform will remain station-
ary when the said driving pulleys are running at the same relative rate of
circumferential speed, but will move either upwards or downwards when the
relative rates of circumferential speed of said driving pulleys are changed so that
one of them will run either faster or slower than the other, all substantially as
herein set forth and described.
3. An elevator having a car, cage, or platform and containing two driving
pulleys that are adapted to act as sprocket pulleys and which are capable of being
driven at the same and also at different relative rates of circumferential speed,
and an endless chain that passes around both of said driving pulleys and is adapted
to act as a sprocket chain therewith and which chain is connected with said car,
cage, or platform so as to control its actions, all of said parts being so arranged
and combined that the said driving pulleys and the said endless chain will each
run continuously in one direction and the said car, cage, or platform will remain
stationary when the said driving pulleys are both running at the same relative
rate of circumferential speed, but will move either upwards or downwards when
the relative rates of circumferential speed of said driving pulleys are changed
so that one of them will run either faster or slower than the other, all substantially
as herein set forth and described.
4. The combination in an elevator of two driving pulleys which are capable
of being driven at the same and also at different relative rates of circumferential
speed, a load that is to be raised or lowered, an endless rope that passes around
both of said driving pulleys and has therein bights or loops, two travelling pulleys
the first of which pulleys is attached to the load and is carried in one of said loops
or bights of the endless rope and the second of which is carried in another of the
loops or bights of the endless rope, a stationary friction pulley, and a rope that is
attached at one of its ends to the load and from thence passes downwards to and
around the said stationary friction pulley and returning upwards is attached at
its other end to the said second travelling pulley so as to hold the endless rope
taut and prevent its slipping on the driving pulleys, all of said parts being so
arranged and combined that the said driving pulleys and said endless rope will
each run continuously in one direction, and the said load will remain stationary
when the said driving pulleys are running at the same relative rate of circum-
ferential speed but will move either upwards or downwards when the relative
rates of circumferential speed of the driving pulleys are changed so that one of
them will run either faster or slower than the other, all substantially as herein set
forth and described.
5. The combination in an elevator of two driving pulleys which are capable
of being driven at the same and also at different relative rates of circumferential
speed, a load that is to be raised or lowered, and an endless rope that passes around
both of said driving pulleys and which is connected with said load so as to control
its actions, with an additional idler pulley for increasing the frictional adhesion
of the endless rope to the driving pulleys, all of said parts being so arranged and

page_text: combined that the said driving pulleys and said endless rope will each run con-
tinuously in one direction and the said load. will remain stationary when the
driving pulleys are running at the same relative rate of circumferential speed
but will move either upwards or downwards when the relative rates of circum-
ferential speed of the driving pulleys are changed so that one will run either
faster or slower than the other, all substantially as herein' set forth and described.
6. The combination in an elevator of two driving pulleys which are capable
of being driven at the same and also at different relative rates of circumferential
speed, a load that is to be raised or lowered, an endless rope provided with bights
or loops that is connected with the load and controls its actions, travelling pulleys
the first of which pulleys is carried in one of said loops or bights of the endless
rope and the second of which is carried in another of the loops or bights of the
endless rope, a rope that is connected at one of its ends with the first of said
travelling pulleys and after passing around a friction pulley is connected at its
other end with the second of said travelling pulleys, the said friction pulley, and a
tension apparatus, all of said parts being so arranged and combined that the
driving pulleys and endless rope will each run continuously in 'one direction and
the load will remain stationary when the driving pulleys are running at the same
relative rates of circumferential speed but will move either upwards or downwards
when the relative rates of circumferential speed of the driving pulleys are changed
so that one of them will run either faster or slower than the other, all substantially
as herein set forth and described.
J
7. The combination in an elevator of a car, cage, or platform with a travelling
friction pulley at its upper part for lifting it, two driving pulleys that are capable
of being driven at the same and also at different relative rates of circumferential
speed, an endless rope running around said travelling pulley and around both of
said driving pulleys, another travelling pulley that is carried in the bight of said
endless rope that is beyond the driving pulleys from said car, cage, or platform,
a rope that connects the second of said travelling pulleys with the bottom of said
car, cage, or platform and passing around another friction pulley that is stationary
and located opposite to said driving pulleys, the said stationary friction pulley,
and a tightening apparatus, all being combined and arranged substantially as
herein described and set forth, and so that the driving pulleys and endless rope
will each run continuously in one direction and the car, cage, or platform will
remain stationary when the driving pulleys are running at the same relative rates
of circumferential speed but will move either upwards or downwards when the
relative rates of circumferential speed of the driving pulleys are changed so that
one of them will run either faster or slower than the other.
8. In an elevator the combination of a car, cage, or platform, two driving
pulleys that are capable of being driven at the same and also at different relative
rates of circumferential speed, a counterweight, two stationary friction pulleys,
a rope or set of ropes passing over one of said stationary friction pulleys and con-
necting the counterweight with the car, cage, or platform, in such a manner that
when the counterweight descends it will draw the car, cage, or platform upwards,
and when the counterweight ascends it will allow the car, cage, or platform to
descend by its own gravity, another rope or set of ropes passing over the other
of said stationary friction pulleys and being connected at one end to the said
counterweight and at the other end to a travelling friction pulley, two travelling
friction pulleys, one of which is the one that is connected to one end of said last
mentioned rope or set of ropes and the other of which is attached to the bottom
of said counterweight, and one or more endless ropes that pass around both of the
said driving pulleys and also around both of the said travelling friction pulleys,
all combined and arranged substantially as herein set forth and described and so
that the driving pulleys and endless rope or ropes will each run continuously in
one direction and the car, cage, or platform will remain stationary when the
driving pulleys are running at the same relative rates of circumferential speed
but will move either upwards or downwards when the relative rates of circum-

page_text: ferential speed of the driving pulleys are changed so that one of them will run
either faster or slower than the other.
9. In an elevator the combination of a car, cage, or platform, two driving
pulleys that are capable of being driven at the same and also at different relative
rates of circumferential speed, a counterweight, a tightening device, two stationary
friction pulleys, a rope or set of ropes passing over one of said stationary friction
pulleys and connecting the counterweight with the car, cage, or platform in such
a manner that when the counterweight descends it will draw the car, cage, or
platform upwards and when the counterweight ascends it will allow the car, cage,
or platform to descend by its own gravity, another rope or set of ropes passing
over the other of said stationary friction pulleys and being connected at one end
to the said counterweight and at the other end to a travelling friction pulley,
two travelling friction pulleys one of which is the one that is connected to the
end of said last mentioned rope or set of ropes and the other of which is attached
to the bottom of said counterweight, and one or more endless ropes that pass
around both of said driving pulleys and also around both of the said travelling
friction pulleys, all combined and arranged substantially as herein set forth and
described and so that the driving pulleys and endless rope or ropes will each run
continuously in one direction and the car, cage, or platform will remain stationary
when the driving pulleys are running at the same relative rates of circumferential
speed but will move either upwards or downwards when the relative rates of
circumferential speed of the driving pulleys are changed so that one of them will
run either faster or slower than the other.
10. The improved elevator or hoisting machine constructed and operating sub-
stantially as described with reference to Figures 1 and 2, or to Figure 3, or to
Figure 5 of the accompanying drawings.
Ju
THIS
W. P. THOMPSON & Co.,
Of London, Liverpool, Manchester, and Birmingham,
Patent Agents for the Applicant.