An Improved Motor Especially Adapted for Operating Lifts, but Applicable also for other Purposes.
Year: 1889

page_text: Date of Application, 22nd Feb., 1889
Complete Specification Left, 15th Nov., 1889-Accepted, 21st Dec.,
1889
PROVISIONAL SPECIFICATION.
An Improved Motor Especially Adapted for Operating Lifts, but
Applicable also for other Purposes.
A communication from abroad by WILLIAM PARKER GIBSON, of 138, East 16th Street,
New York, United States of America, Engineer.
I PHILIP MIDDLETON JUSTICE of 55 and 56 Chancery Lane in the County of
Middlesex, Fellow of the Institute of Patent Agents do hereby declare the nature
of this invention to be as follows:-
This Invention relates to an oscillating motor, which, although adapted for many
purposes, is especially designed for use as a hoisting motor for elevators or lifts it
being one of the principal objects of the invention to produce a motor for use in
connection with elevators and for other purposes in which the power developed shall
be automatically regulated to conform to the load to be moved.
The nature of the invention can best be described by an illustration and a detailed
description of the motor embodying the same and therefore all preliminary descrip-
tion will be omitted and a detailed description given, reference being had to the
accompanying drawings, in which—
Fig. 1 is a diagrammatic view showing the motor applied as a hoisting motor for
an elevator, the motor being shown in end elevation.
Fig. 2 is an enlarged side elevation of the motor.
Fig. 3 is a longitudinal vertical section of the same.
Fig. 4 is an enlarged end elevation of the motor partly in section.
Fig. 5 is a cross section of the motor taken on the line 5 of Figs. 2 and 3.
Fig. 6 is a horizontal section taken on substantially the line 6 of Figs. 3 and 5.
Fig. 7 is a side elevation of the motor showing a different means of transmitting
the motion to the elevator car.
Referring to said Figures it is to be understood that A represents an elevator car
of ordinary form and B its hoisting cable. The cable B, as shown in Fig. 1, is passed
around a series of stationary sheaves (a) and a corresponding series of travelling
sheaves (b) which hang in the depending loops of the cable and by which means a
comparatively limited movement of the travelling sheaves will impart a comparatively
extended movement to the car. The purpose of this will appear when the construction
and operation of the motor is explained.
The movements of the car are, in the case illustrated in Fig. 1 controlled by means
of a deflecting apparatus E acting upon a rope C which passes through or adjacent to
the car and has its ends connected to operate the valves of an auxiliary valve
apparatus D which controls the movements of the motor.
As neither the deflecting device E nor auxiliary valve apparatus D form part of the
present invention no detailed description thereof is herein given as any suitable
devices may be used to secure the action of the parts as hereinafter described.
The motor embodying the present invention consists primarily of a cylinder G
which is mounted upon a shaft H supported in a suitable frame work. The cylinder G
is free to move longitudinally upon the shaft H and may be free to turn upon the
shaft, as indicated in Fig. 3, or it may be splined to the shaft, the shaft being free to
turn in its bearings as in the case of the construction illustrated in Fig. 7, which will
be hereinafter explained. One end of the cylinder G is closed by a head (9) while
the opposite end of the cylinder is open. Entering and fitting into the open end of
the cylinder G is an annular head K which is supported upon a sleeve (c) which is
secured to the cylinder head (g) and surrounds the shaft H. The head K is secured
to a stationary bracket (d) by which it is prevented from turning with the cylinder G,

page_text: The open end of the cylinder G is provided with a suitable stuffing box (f) or other
means for forming a tight joint between the cylinder and the head. Passing through
the head (g) of the cylinder G is a plate (h) forming a piston which fills the entire
space between the sleeve (c) and the wall of the cylinder G and fits tightly against
the inner end of the head K, this plate being held in position against the head K by
means of an adjusting screw 2 supported in an arm 3 extending from the shaft H and
fixed against longitudinal movement on said shaft. The head (g) of the cylinder G
is provided with a suitable stuffing box (k) which surrounds the plate (h) and forms
a tight joint between the plate and the head of the cylinder. Passing through the
head K is a similar plate (m) which also fills the entire space between the sleeve (c)
and the wall of the cylinder G and fits tightly against the head (g) of the cylinder
at one side of the plate (h). The plate (m) is held snugly against the head (g) of the
cylinder by means of a set screw 4 carried upon the arm which extends from the
sleeve (c) and is arranged so as to permit said sleeve to turn freely without imparting
any movement to the arm, but is arranged so as to be prevented from having any
longitudinal movement on the sleeve.
For the purpose of forming a tight joint between the plate (m) and the head K the
plate is reduced in size within the head so as to form a space for receiving a suitable
packing (n) which is held in position by means of a cap (o) which fits over the outer
end of the plate and abuts against the packing and is held in position by means of
screws 6.
The arm 5, which, as before stated, is loose upon the sleeve (e), but is connected by
the screw with the plate (m) so as to be prevented from turning about the sleeve,
is connected by a pair of rods 7 with a cross-head 8, to which is connected the rod 9
of a piston 10 which works in a small cylinder (p) located in line with the shaft H.
The cylinder (p) communicates at its opposite ends with pipes 12, 13 which are con-
trolled by the valve apparatus D in such manner as to admit and exhaust water under
pressure to and from the opposite ends of the cylinder (p) at the will of the operator
of the car.
The head K is provided with two ports 14, 15 which open into the cylinder G
upon opposite sides of the plate (m). These ports communicate through pipes 16, 17
with a valve-chest (q) which also communicates with a supply-pipe 18 and with two
exhaust pipes 19, 20 which lead to a tank L. The valve-chest (g) is provided with a
valve N composed of three pistons 21, 22, 23, which are mounted upon a single
rod 24, and the ports opening into the chest from the pipes 16, 17, 18, 19 and 20 are
so arranged that when the valve is in its mid-position the pistons 21, 22 will close
the ports leading to the pipes 16, 17 respectively and thus prevent both the induction
and exhaust of water to and from the cylinder G. When however, the valve is
moved to the left the respective pipes 17, 18, and 16, 19, will be brought into coin-
munication so that the water contained in the cylinder G upon one side of the
plate (m) will be free to pass out through the pipes 16, 19, to the tank L, while
the water from the supply pipe 18 will be free to enter through the pipe 17 to the
cylinder upon the opposite side of the plate (m). The tank L is of course provided
with a suitable overflow pipe.
When the valve is moved to the right cominunication will be cut off between the
pipes 17, 18 and established between the pipes 17, 19, and 16, 20 respectively,
thereby allowing the water contained in the cylinder upon one side of the plate (m)
to pass out through the pipes 17, 19 to the tank and water to pass in from the tank
through the pipes 20, 16 to the cylinder upon the opposite side of the plate (m).
The valve N may be operated in any suitable manner from the car or from any
other position, according to the use to which the motor is applied. In the present
case, however, it is shown as operated through the auxiliary valve apparatus D. To
this end the rod 24 is extended and provided with a pistou 25 which works in a
cylinder S having pipes 26, 27 which communicate with the pipes 12, 13 and
through which the water is admitted from the valve apparatus D to the opposite
ends of the cylinder to move the valve in one direction or the other, as may be
required.

page_text: The water for operating the pistons 10 and 25 is supplied through a pipe 28. which
communicates with the valve apparatus D and with the supply-pipe 18, or with
any other source from which water can be obtained under the necessary pressure.
In the application of the invention illustrated in Figure 1 the cylinder G forms.
a drum on which is wound a cable M which is connected to the frame in which the
travelling sheaves (b) are mounted.
The operation of the motor when thus applied is as follows:-When the motor is
in its normal position the piston 10 will be moved outward in the cylinder (p), thereby
through the connections which have been described moving the cylinder G on the
shaft H until the head K is nearly or quite in contact with the head (g). Assuming.
now that it is desired to cause the car to ascend, the proper one of the valves of the
valve apparatus D will be operated to allow the water under pressure to pass from the.
pipe 28 to the pipes 13, 27 and enter the outer end of the cylinder (p) and the inner
end of the cylinder (s), the water in the opposite ends of the cylinders at the same
time escaping through the pipes 12, 26. The water admitted to the cylinder (s) will
operate upon the piston 25 to move the valve to the left, thereby establishing com-
munication between the pipes 18, 17 to admit water to the cylinder G upon one side
of the plate (m), and at the same time communication will be established between
the pipes 16, 19 to allow the water upon the other side of the plate (m) to escape.
The water thus entering the cylinder G through the pipe 17 will exert a pressure
tending to move the plates (h) (m) apart. The plate (m) being, however, held
stationary, this pressure will tend to move the plate (h) away from the plate (m) and
thus revolve the cylinder G in the direction to wind up the cable M onto the
cylinder and raise the car. The head K being, however, at this time nearly or quite
in contact with the head (g) the area of the plates (h), (m), upon which the water
acts, will be very small and consequently if the car contains any considerable load
this pressure will not be sufficient to raise it. At the same time, however, that water
is thus admitted to act upon the plates (h), (m) to move them apart water is also
admitted under pressure through the pipe 13 to the outer end of the cylinder (p)
and the water thus admitted to the cylinder (p) will operate upon the piston 10 to
move the latter inward and move the cylinder G along the shaft H so as to separate
the heads K and (g) and increase the area of the plates (h), (m) to be acted upon by
the water, and this will continue until the area of the plates has been sufficiently
increased to cause the pressure of the water admitted to the cylinder G to raise the
car. As soon as the car starts the valve of the apparatus D will be closed so as to
shut off the further admission of water to the cylinder (s). The valve N having,
however, been shifted to the left the water will continue to enter the cylinder G and
turn said cylinder about the shaft H so as to wind up the cable M and raise the car.
To stop the car the other valve of the apparatus D will be operated so as to move
the valve N in the reverse direction and shut off the admission and exhaust of the
water to and from the cylinder G. The plate (h) will then be locked in position by
the water upon both its sides so as to hold the cylinder G ant the car in any position
in which they are stopped.
To cause the car to descend the proper valve of the apparatus D will be operated
to move the valve N to the right from its mid position, thereby allowing the water
upon one side of the plate (m) to pass out through the pipes 17, 19 to the tank L
and the water to be drawn by suction from the tank into the cylinder upon the other
side of the plate (h). To stop the car in its descent the valve N is moved back to
its mid position the same as in arresting the car in its ascent. As the valve of the
apparatus D is operated to allow the car to descend the water will be admitted to the
inner end of the cylinder (p) and will, as the car completes its descent, exert sufficient
pressure upon the piston 10 of said cylinder to move it outward and restore the
cylinder G to its original position. It will thus be seen that the amount of water
consumed at each ascent and descent of the car is proportioned to the load upon the
car so that when the car carries a light load a less quantity of water at a given
pressure is required to effect the ascent than when the car is more heavily loaded,

page_text: whereas, in hydraulic elevators as ordinarily constructed, the volume of water con-
sumed at each ascent and descent of the car is the same regardless of the load 'upon
the car.
If in any case it should not be desired to cause the water to circulate from one side
to the other of the plate (h) during the descent of the car; the pipes 16, 20 and
port 14 will be omitted.
From the foregoing it will be seen that with the motor thus organized it is necessary
to accomplish the entire ascent or descent of the car with something less than one
revolution of the cylinder G. This makes it necessary, unless the cylinder is made of
very great diameter, to provide means for multiplying the movement derived from
the cylinder before it is transmitted to the car, and it is for this purpose that the
series of fixed and travelling sheaves (a), (b) are employed. The same result may be
accomplished in other ways, as, for example, as shown in Figure 7, in which case the
sleeve (c) of the cylinder G is splined to the shaft H and the shaft is made capable
of revolving in its bearings and is extended and provided with a gear 29 which
engages with a small pinion 30 secured to the shaft of a drum O upon which the
hoisting cable B is wound. By this means the movement of the drum O is sufficiently
increased beyond the movement of the cylinder G to effect the necessary winding
and unwinding of the cable B to give the car the necessary travel.
In the organization illustrated the head K is made stationary both as to longitudinal
and rotary movement, while the cylinder G is made capable of oscillating and moving
longitudinally. It will be readily seen, however, that this order may be reversed or
that one of the movements may be imparted to the cylinder and the other to the
head and such change will not be a departure from the invention.
Dated this 22nd day of February 1889.
PHILIP M. JUSTICE.
COMPLETE SPECIFICATION.
An Improved Motor Especially Adapted_for Operating Lifts, but
Applicable also for other Purposes.
A communication from abroad by William Parker GIBSON, of 138, East 16th Street,
New York, United States of America.
I, PHILIP MIDDLETON JUSTICE of 55 and 56 Chancery Lane in the County of
Middlesex, Fellow of the Institute of Patent Agents, 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 an oscillating hydraulic motor, which, although adapted
for many purposes, is especially designed for use as a hoisting motor for elevators or
lifts it being one of the principal objects of the invention to produce a motor for use
in connection with elevators and for other purposes in which the power developed
shall be automatically regulated to conform to the load to be moved.
The nature of the invention can best be described by an illustration and a detailed
description of the motor embodying the same and therefore all preliminary description
will be omitted and a detailed description given, reference being had to the drawings
filed with the Provisional Specification, in which ;
Fig. 1 is a diagrammatic view showing the motor applied as a hoisting motor for
an elevator, the motor being shown in end elevation.
Fig. 2 is an enlarged side elevation of the motor.
Fig. 3 is a longitudinal vertical section of the same.
Fig. 4 is an enlarged end elevation of the motor partly in section.
Fig. 5 is a cross section of the motor taken on the line 5 of Figs. 2 and 3.
Fig. 6 is a horizontal section taken on substantially the line 6 of Figs. 3 and 5.
Fig. 7 is a side elevation of the motor showing a different means of transmitting
the motion to the elevator car.

page_text: Referring to said Figures it is to be understoo: that A represents an elevator car
of ordinary form and B its hoisting cable. The cable B, as shown in Fig. 1, is passed
round a series of stationary sheaves a and a corresponding series of travelling
heaves which hang in the depending loops of the cable and by which means a
comparatively limited movement of the travelling sheaves will impart a comparatively
exten led movement to the car. The purpose of this will appear when the construction
and operation of the motor is explained.
The movements of the car in the case illustrated in Fig. 1 are controlled by means
of a deflecting apparatus E acting upon a rope (which passes through or adjacent
to the car and has its ends connected to operate the valves of an auxiliary valve
apparatus D which controls the movements of the motor.
As neither the deflecting device E nor auxiliary valve apparatus D form part of the
present invention no detailed description thereof is herein given as any suitable devices
may be used to secure the action of the parts as hereinafter described.
The motor embodying the present invention consists primarily of a cylinder G
which is mounted upon a shaft H supported in a suitable framework. The cylinder G
is free to move longitudinally upon the shaft H and may be free to turn upon the
shaft, as indicated in Fig. 3, or it may be splined to the shaft, the shaft being free to
turn in its bearings as in the case of the construction illustrated in Fig. 7, which
will be hereinafter explained. One end of the cylinder G is closed by a head g
while the opposite end of the cylinder is open. Entering and fitting into the open
end of the cylinder G is an annular head K which is supported upon a sleeve c
which is secured to the cylinder head g and surrounds the shaft H. The head Kis
secured to a stationary bracket d by which it is prevented from turning with the
cylinder G. The open end of the cylinder G is provided with a suitable stuffing
box for other means for forming a tight joint between the cylinder and the head.
Passing through the head g of the cylinder G is a plate h forming a piston which
fills the entire space between the sleeve c and the wall of the cylinder G and fits
tightly against the inner end of the head K, this plate being held in position
against the head K by means of an adjusting screw 2 supported in an arm 3
extending from the shaft H and fixed against longitudinal movement on said shaft.
The head g of the cylinder G is provided with a suitable stuffing-box k which surrounds
the plate and forms a tight joint between the plate and the head of the cylinder.
Passing through the head K is a similar plate m which also fills the entire space.
between the sleeve and the wall of the cylinder G and fits tightly against the head g
of the cylinder at one side of the plate h. The plate m is held snugly against the
head g of the cylinder by means of a set screw 4 carried upon the arm 5 which
extends from the sleeve c and is arranged so as to permit said sleeve to turn freely
without imparting any movement to the arm, but is arranged so as to be prevented
from having any longitudinal movement on the sleeve.
C
For the purpose of forming a tight joint between the plate m and the head K the
plate is reduced in size within the head so as to form a space for receiving a suitable
packing n which is held in position by means of a cap o which fits over the outer
end of the plate and abuts against the packing and is held in position by means of
screws 6.
but is connected by
The arm 5, which, as before stated, is loose upon the sleeve
the screw 4 with the plate m so as to be prevented from turning about the sleeve, is
connected by a pair of rods 7 with a cross-head 8, to which is connected the rod 9:
of a piston 10 which works in a small cylinder p located in line with the shaft H.
The cylinder p communicates at its opposite ends with pipes 12, 13 which are
controlled by the valve apparatus D in such manner as to admit and exhaust
water under pressure to and from the opposite ends of the cylinder p at the will of the
operator of the car.
The head K is provided with two ports 14, 15 which open into the cylinder G upon
opposite sides of the plate m. These ports communicate through pipes 16, 17 with
a valve-chest which also communicates with a supply-pipe 18 and with two exhaust.
pipes 19, 20 which lead to a tank L. The valve-chest q is provided with a valve N

page_text: composed of three pistons 21, 22, 23, which are mounted upon a single rod 24, and
the ports opening into the chest from the pipes 16, 17, 18, 19, and 20 are so
arranged that when the valve is in its mid-position the pistons 21, 22 will close
the ports leading to the pipes 16, 17 respectively and thus prevent both the induction
and exhaust of water to and from the cylinder G. When, however, the valve is
moved to the left the respective pipes 17, 18, and 16, 19 will be brought into com-
munication so that the water contained in the cylinder G upon one side of the
plate m will be free to pass out through the pipes 16, 19 to the tank L, while the
water from the supply pipe 18 will be free to enter through the pipe 17 to the cylinder
upon the opposite side of the plate m. The tank L is of course provided with a
suitable overflow pipe.
When the valve is moved to the right, communication will be cut off between the
pipes 17, 18 and established between the pipes 17, 19 and 16, 20 respectively, thereby
allowing the water contained in the cylinder upon one side of the plate m to pass
out through the pipes 17, 19 to the tank and water to pass in from the tank through
the pipes 20, 16 to the cylinder upon the opposite side of the plate m.
The valve N may be operated in any suitable manner from the car or from any
other position, according to the use to which the motor is applied. In the present
case, however, it is shown as operated through the auxiliary valve apparatus D. To
this end the rod 24 is extended and provided with a piston 25 which works in a
cylinder S having pipes 26, 27 which communicate with the pipes 12, 13 and
through which the water is admitted from the valve apparatus D to the opposite
ends of the cylinder to move the valve in one direction or the other, as may
be required.
The water for operating the pistons 10 and 25 is supplied through a pipe 28
which communicates with the valve apparatus D and with the supply-pipe 18,
or with any other source from which water can be obtained under the necessary
pressure.
In the application of the invention illustrated in Fig. 1 the cylinder G forms a
drum on which is wound a cable M which is connected to the frame in which the
travelling sheaves b are mounted.
The operation of the motor when thus applied is as follows:- -When the motor is in
its normal position the piston 10 will be inoved outward in the cylinder p, thereby
through the connections which have been described moving the cylinder G on the
shaft. H until the head K is nearly or quite in contact with the head y. Assuming
now that it is desired to cause the car to ascend, the proper one of the valves of the
valve apparatus D will be operated to allow the water under pressure to pass from the
pipe 28 to the pipes 13, 27 and enter the outer end of the cylinder p and the inner
end of the cylinder S, the water in the opposite ends of the cylinders at the same
time escaping through the pipes 12, 26. The water admitted to the cylinder S will
operate upon the piston 25 to move the valve to the left, thereby establishing com-
munication between the pipes 18, 17 to admit water to the cylinder G upon one side
of the plate m, and at the same time communication will be established between the
pipes 16, 19 to allow the water upon the other side of the plate m to escape. The
water thus entering the cylinder G through the pipe 17 will exert a pressure tending
to move the plates h m apart. The plate m being, however, held stationary, this
pressure will tend to move the plate h away from the plate m and thus revolve the
cylinder G in the direction to wind up the cable M onto the cylinder and raise
the car.
The head K being, however, at this time nearly or quite in contact with the
head g the area of the plates h, m, upon which the water acts, will be very small and
consequently if the car contains any considerable load this pressure will not be
sufficient to raise it. At the same time, however, that water is thus admitted to act
upon the plates h, m, to move them apart water is also admitted under pressure through
the pipe 13 to the outer end of the cylinder p and the water thus admitted to the
cylinder p will operate upon the piston 10 to move the latter inward and move the
cylinder G along the shaft H so as to separate the heads K and g and increase
the area of the plates h, m, to be acted upon by the water, and this will continue until

page_text: the area of the plates has been sufficiently increased to cause the pressure of the water
admitted to the cylinder G to raise the car. As soon as the car starts the valve of
the apparatus D will be closed so as to shut off the further admission of water to the
cylinder S. The valve M having, however, been shifted to the left the water will
continue to enter the cylinder G and turn said cylinder about the shaft H so as to
wind up the cable M and raise the car. To stop the car the other valve of the
apparatus D will be operated so as to move the valve N in the reverse direction and
shut off the admission and exhaust of the water to and from the cylinder G. The
plate will then be locked in position by the water upon both its sides so as to hold
the cylinder G and the car in any position in which they are stopped.
To cause the car to descend the proper valve of the apparatus D will be operated to
move the valve N to the right from its mid-position, thereby allowing the water upon
one side of the plate m to pass out through the pipes 17, 19 to the tank L and the
water to be drawn by suction from the tank into the cylinder upon the other side of
the plate . To stop the car in its descent the valve N is moved back to its mid-
position the same as in arresting the car in its ascent. As the valve of the apparatus D
is operated to allow the car to descend the water will be admitted to the inner end of
the cylinder p and will, as the car completes its descent, exert sufficient pressure upon
the piston 10 of said cylinder to move it outward and restore the cylinder G to its
original position. It will thus be seen that the amount of water consumed at each
ascent and descent of the car is proportioned to the load upon the car so that when the
car carries a light load a less quantity of water at a given pressure is required to effect
the ascent than when the car is more heavily loaded whereas, in hydraulic elevators
as ordinarily constructed, the volume of water consumed at each ascent and descent of
the car is the same regardless of the load upon the car.
If in any case it should not be desired to cause the water to circulate from one
side to the other of the plate h during the descent of the car, the pipes 16, 20
and port 14 will be omitted.
From the foregoing it will be seen that with the motor thus organized it is necessary
to accomplish the entire ascent or descent of the car with something less than one
revolution of the cylinder G. This makes it necessary, unless the cylinder is made of
very great diameter, to provide means for multiplying the movement derived from
the cylinder before it is transmitted to the car, and it is for this purpose that the series
of fixed and travelling sheaves a, b are employed. The same result may be accom-
plished in other ways, as, for example, as shown in Fig. 7, in which case the sleeve c
of the cylinder G is splined to the shaft H and the shaft is made capable of revolving
in its bearings and is extended and provided with a gear 29 which engages with a
small pinion 30 secured to the shaft of a drum O upon which the hoisting cable B is
wound. By this means the movement of the drum O is sufficiently increased Leyond
the movement of the cylinder G to effect the necessary winding and unwinding of
the cable B to give the car the necessary travel.
In the organization illustrated the head K is made stationary both as to longitudinal
and rotary movement, while the cylinder G is made capable of oscillating and moving
longitudinally. It will be readily seen, however, that this order may be reversed or
that one of the movements may be imparted to the cylinder and the other to the head
and such change will not be a departure from the invention.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is :-
.1. The combination with the cylinder G and the head K fitting into the cylinder,
one of said parts being fixed and the other oscillating and one being capable of longi-
tudinal movement with relation to the other, of the movable plate h carried by the
cylinder and fitting against the head K, the movable plate m carried by the head K
and fitting against the head of the cylinder at one side of the plate h, and a port 15
for admitting and exhausting the liquid to and from the cylinder between the plates,
substantially as described.

page_text: 2. The combination with the oscillating and longitudinally moving cylinder G, of
the fixed head K fitting into said cylinder, the plate h carried by the cylinder G and
movable in the direction of the length of the cylinder so as to maintain contact with
the head K, the plate m carried by the head K and entering the cylinder at one side
of the plate and movable longitudinally with the cylinder, and a port 15 for
admitting and exhausting the liquid to and from the cylinder between the plates,
substantially as described.
3. The combination with the oscillating and longitudinally moving cylinder G, of
the fixed head K fitting into said cylinder, the plate h carried by the cylinder G and
movable in the direction of the length of the cylinder so as to maintain contact with
the head K, the plate m carried by the head K and entering the cylinder at one side
of the plate and movable longitudinally with the cylinder, a port 15 for admitting
and exhausting the liquid to and from the cylinder between the plates and the
cylinder p having a piston 10 connected to the cylinder G to move the same longi-
tudinally, substantially as described.
4. The combination with the cylinder G and the head K fitting into the cylinder,
one of said parts being fixed and the other oscillating and one being capable of longi-
tudinal movement with relation to the other, of the movable plate h carried by the
cylinder and fitting against the head K, the movable plate m carried by the head K
and fitting against the head of the cylinder at one side of the plate h, and ports 14, 15
for admitting and exhausting the liquid to and from the cylinder upon the opposite
sides of the plate m, substantially as described.
Dated this 15th day of November 1889
PHILIP M. JUSTICE.