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Патент USA US2136080

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Nov; 8,> 1938.
Filed‘septjlsa, 1954
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Jasepá Ä'Joy
Patented Nov. 8, 1938
Joseph F. Joy, Claremont, N. H., assìgnor to Sul
livan Machinery Company, a corporation of
Application September 19, 1934, Serial No. 744,703
4 Claims.
My invention relates to fluid operated exten
sible supports, and more particularly to hydrauli
cally operated posts for use as mineprops or the
An object of my invention is to provide an
improved fluid pressure operatedl extensible sup
porting device. Another object of my invention
is to provide an improved hydraulically operated
post or group.
A further object of my invention
10 ls to provide in a hydraulic prop improved oper
ating and controlling means. Other objects and
advantages of my invention will hereinafter more
full.;r appear.
In the accompanying drawing, in which one
embodiment of the invention is shown for pur
poses of illustration,
Fig. 1 is a central vertical section through the
illustrative embodiment;
Fig. 2 is a fragmentary view on a section cor
20 responding to the section of Fig. 1, but showing
parts in different relation, and
Fig. 3 is a fragmentary sectional view showing
a conventional slip device.
Referring to the drawing, it will be observed
25 that a bottom plate or abutment I supports in
rigid relation thereto a cylinder 2 having an
upper head 3 traversed by a bore 4 through
which a hollow member 5 is slidably movable.
The member 5 corresponds to a piston rod and
is connected at its lower end 6 to a piston mem
ber 1 having a suitable packing 8. A sealing
ring 9 is carried by the head 3. The upper end
of the member 5 supports an abutment or plate
I0 which is, in the embodiment of the invention
35 shown, adapted to engage a mine roof or the like.
In the collapsed position of the parts shown in
Fig. 1 a substantial quantity of liquid, prefer
ably an oil of suitable viscosity, is enclosed within
the bore of the hollow member 5 and this is in
tended to be displaced from the space within
the interior of the member 5 to the space within
the cylinder 2 below the piston 1, in order to
effect extension of the jack or post.
For this
purpose there is arranged, herein integrally with
45 piston 1, a central upwardly extending cylinder
member I2 having a bore I3 in which a suitable
pump plunger I4 is reciprocably mounted. The
bore I3 communicates, at a point adjacent the
lower end of the stroke of the plunger I4, with
50 a valve chamber I5 through a port I6, the valve
chamber I5 containing a ball valve I1 cooperat
ing with a seat I8 to permit the drawing-in of
liquid from the interior of the member 5 through
a suction port 20, while preventing reverse flow.
The extreme bottom of the bore I3 communicates
through a port 2I surrounded by a valve seat 22
and controlled by a spring loaded ball valve 23
with a chamber 24 in which the ball valve and
its spring 25 are mounted; and`the chamber 24
is provided with a discharge port in the form of
an opening 26 through a closure plug 21 so that
fluid forced through the opening 2l and past the
valve 23 may be discharged through the opening
2S into the space below the piston 1.
The plunger I4 is connected by a pitman 30 10
with a crankpin 3| upon a crank disc 32 suitably
supported upon a drive shaft 33, which is rotat
ably mounted in a bushing 34 in a cover plate 35
secured to -the member 5 at an appropriate po
sition. A suitable packing 35 surrounds the shaft
33. Shaft 33 supports a polygonal socket 31 at
its outer end, and with this the driving element
38 of a suitable operating motor 39 is adapted to
be connected to rotate the shaft 33 and t-o oper
ate the pump plunger I4. The motor 39 may :20
desirably have between it and its terminal driv
ing element 38 a slip friction mechanism, for
example, as shown at 60 in Fig. 3, to permit slip
page when the abutment plate Il) reaches and
is forced solidly against the surface which it is 25
intended to engage. Other suitable expedients
for preventing excessive shocks and sudden stop
page of the motor may be resorted to, as, for
example, the arrangement of a slipping clutch
such as that shown in Figure 3, between the drive 30
socket member 31 and the crank disc 32.
Parallel to the chamber 24 there is arranged
a second chamber 4I) in the piston member 1.
This chamber contains a ball valve 4I normally
held seated by a spring 42 and controlling flow
vbetween the chamber 4D, whose lower end is con
nected by a passage 43 with the space below the
piston 1, and a passage 44 which extends through
the upper end of the piston member 1 and com
municates with the space within the interior of v4,0
the member 5. In suitable guides 45 a plunger
rod 46 is mounted in a position to extend freely
into engagement with the ball valve 4I, and a
sleeve 41 is slidably mounted upon the pump
cylinder element I2 and has a collar 48 for en- 45
gaging the upper end of the plunger r-od 46. A
spring 49 engages the lower end of the sleeve 41
and also engages a shoulder 5|] on the piston
member 1, whereby the sleeve 41 is normally held
in a position such that the plunger rod 46 will `50
not unseat the ball valve 4I. A link 52 pivotally
connected at 53 to the sleeve 41 is pivotally oon
nected at its upper end to a crankpin 54 upon
a shaft 55 which projects through a suitable
_stuiiing box.56 formed in the wall of the mem- ,56
ber 5, and a wrench or handle may be applied to
the extremity 51 of the shaft 55 to enable rota
tion -of the latter and thereby movement of the
pin 54 to move the link 52 downwardly and
thereby depress the sleeve 41 far enough to cause
having a cylinder fixed with respect to the latter
for displacing iluid from one side of said piston
to the other, a iluid displaceable by said pump,
means controlling reverse flow of said fluid, and
the plunger rod 46 to be enga-ged and to be moved
downwardly to unseat the ball valve 4l and
controlling means for said reverse-flow-control
ling means including an element surrounding said
thereby to open a free communication between
the opposite sides of the piston 1.
The mode of operation of the device will Ybe
pump cylinder and movable axially of the latter
therewith, a pump carried by said piston and
to enable such reverse flow.
2. In a hydraulic mine column, in combination,
readily apparent from the foregoing description. i an outer cylinder, a piston contained in said outer
The extensible post is brought into the position
cylinder and having a tubular piston rod extend
where it is desired to have it used and is set
upright upon a mine bottom, for example. The
ing through the outer head of the cylinder and
providing a Vfluid reservoir, said cylinder and pis
ton relativelyreciprocable and respectively hav 15
ing means at their remote extremities engageable
15 driving motor is then connected through its driv
ing element 38 with the drive socket 31 and the
shaft 33 is rotated. This causes the crankpin
3l and connecting rod 30 to reciprocate the
plunger I4, and liquid is forced from the cham
ber within the member 5 to the space below the
piston 1, the liquid being drawn in on the up
strokes of the plunger I4 through the inlet port
2B and past the valve I1 and through the port
l5 into the cylinder -bore i3, and being forced
25 on the downward strokes of the plunger I4
through the port 2| past the ball check valve
23 and through the port 26 into the space below
»the piston 1, and the latter is moved upwardly.
When the plate i0 engages the roof, a yielding
-30 mechanism such as has been described will pre
clude breakage of the parts or sudden stoppage
of the motor.
Obviously the post will remain in its extended
position, provided the valves 23 and 4l seat prop
.35 Yerly, just as long as is desired. When it is desired
to release and lower the post, the operator may
rotate the shaft 55 with a wrench or handle ap
plied at 51, thereby causing the drive pin 54 to
move the link 52 downwardly, thereby depressing
»the sleeve 41 and moving the plunger 46 down to
unseat the valve 4 l. The weight of the parts will
then cause the piston 1 and member 5 to move
downwardly, while the liquid below the piston 1
will pass uprthrough the port 43, chamber 4U and
port 44 and into the interior of the member 5
From the foregoing description it will be evi
dent that I have provided a very simple, compact,
rugged and easily controlled extensible device,
which is well adapted to use either as a hydraulic
50 jack or as a mine prop or for various other pur
poses which will suggest themselves to those
skilled in the art. Due to the use of a liquid, a
rigid holding is eiîected, and due to the detachable
driving element the cost of the units may be kept
low. A simple and positive device for permitting
collapse of the prop or jack will be noted to be
provided and the entire device is wholly without
parts which are subject to easy derangement or
60 likely to be broken during use or handling of the
While there is in this application speciñcally
described one form which the invention may as
sume in practice, it will be understood that this
65 form of the same is shown for purposes of illustra
tion and that the invention may be modiñed and
embodied in various other forms without depart.
ing from its spirit or the scope oi the appended
What I claim as new and desire to secure by
Letters Patent is:
l1. In combination, in an apparatus of the char
acter described, `a cylinder member, a piston
member reciprocable therein, each of said mem
75 bers having an abutment Aelement associated
with extraneous abutments, means for pumping
iluid from said reservoir to said outer cylinder to
act between said outer cylinder and said piston
to eiîe‘ctrelative movement of said piston and 20
.cylinder comprising la pump cylinder mounted on
said piston vand arranged within said tubular
piston rod and submerged within the iluid in the
reservoir, a movable pump element contained in
said pump cylinder, pump intake and discharge 25
passage means Vin said pump cylinder and said
piston for conducting fluid from said reservoir
to said outer cylinder, intake and discharge
valves controlling said passage means, a pump
>driving member mounted on said piston rod and 30
engageable exteriorly of said piston rod with suit
able driving means and connected interiorly of
the piston rod with said movable pump element,
by-pass valve means in said piston for by-pass
ing the fluid from the outer cylinder to said reser
voir within said piston rod, said by-pass valve
means distinct from said pump intake and dis
charge valves, and an operating member mounted
»on the piston rod at a point remote from said
'by-pass valve meansand operable from exteriorly 40
of the piston rod for controlling said by-pass
valve means, said by-pass valve means ‘controlling
member having connections within said piston
Vrod ‘for operating said Vby-pass valve means in
cluding a reciprocable valve operating member
`coaxial with and guided on said pump cylinder.
3. In a`-hydraulic mine column, a base having
a bottom abutment'engaging member and an in
tegral outer cylinder, a piston reciprocable in
said cylinder and having an elongated tubular 50
piston rod extending upwardly through the outer
head of the cylinder and providing a fluid reser
voir,` said piston rod having at its upper extremity
an abutment engaging member, means for pump
ing ñuid from said reservoir to said outer cyl
inder beneath said piston to kact on said piston to
effect relative movement between said piston and
outer cylinder comprising Va pump cylinder
mounted on said reciprocable piston and arranged
within said tubular lpiston rod, a movable pump
element contained in said pump cylinder, pump
intake and discharge passage, means in said pis
ton and pump cylinder for conducting ñuid from
saidreservoir to said outer1 cylinder beneath said
piston, intake and discharge Valves controlling
said passage means, a horizontal drivingmember
journaled in the wall of said piston rod near the
upper extremity ofthe latter and engageable ex
teriorly of said piston rod with suitable driving 70
means and connected interiorly of the piston rod
with said movable pump element, by-pass valve
¿means in said piston for by-passing the fluid from
`the Vouter cylinder beneath said piston »back to
saidreservoir withinsaid piston rod,fsaid _by-pass
valve means distinct from said pump intake and
discharge valves, and means for operating said
by-pass valve means including an operating mem
ber surrounding and guided on the pump cylinder
and a horizontal rotatable member journaled in
the wall of the piston rod in adjacency to said
driving member for said movable pump element
and engageable exteriorly of the piston rod with
suitable rotating means and connected interiorly
10 of the piston rod with the operating member for
' said by-pass valve means.
4. In an extensible mine column, in combina
tion, relatively reciprocable inner and outer tele
scopically arranged column elements, one in the
15 form of a cylinder and the other having a piston
in, said pump including a cylinder containing a
piston and having driving means arranged With
in said recipro‘cable column element, means car
ried by said reciprocable column element and en
gageable exteriorly of said column element with
suitable driving means and connected interiorly
of said reciprocable column element with said
pump driving means, by-pass means including a
by-pass valve distinct from said pump and car
ried Within the piston of said reciprocable column 10
element for by-passing the fluid from said cylin
der beneath said piston back to said reservoir to
effect collapse of the column elements, operating
means for said by-pass valve comprising an op
erating element coaxial with the pump and 15
secured thereto, said piston contained in said cyl
guided on the pump cylinder, and operating-ele
inder, said telescopic 'column elements having
means at their remote extremities engageable
ble column element at a point remote from said
with extraneous abutments, the reciprocable col
20 umn element providing a fluid reservoir, and
means for pumping fluid from said reservoir to
saidcylinder to act on said piston to effect ex
tension of said column elements comprising a
pump carried by the reciprocable column element
25 and submerged in the fluid in the reservoir there
ment-actuating means carried by said reciproca
by-pass valve and having exteriorly of said col
umn element an actuating portion and connected 20
interiorly of said reciprocable column element
with said operating element of the operating
means for said by-pass valve.
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