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Sept.' 17; 194e.
H, F, VICKERS
A
2,407,693"
SAFETY vCONTROL FOR HOISTS AND CIRCUIT THEREFOR
Filed Dec. 3, 1936
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3 Sheets-Sheet 1
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ATTORNEYS.
Sept. i7, 1946.
H. F. vlcKERs
2,407,693
SAFETY CONTROL FOR HOISTS AND CIRCUIT THEREFOR
Filed Deo. 3, 1936
3 Sheets-sheet 2
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ATTORNEYS ‘
Sept. 17, 1946.
__H~.»F. vlcKERs
f'
2,407,693k
SAFETY CONTROL FOR HOISTS AND CIRCUIT THEREFOR
ATTORNEYS.
Patented Sept. 17, 1946
2,407,693
UNITED `STATES PATENT OFFICE
"SAFETY CONTROL FOR ìHOISTS `ANI)
CIRCUIT THEREFOR
Harry F. Vickers, Detroit, Mich., assignor to Vick
ers Incorporated, Detroit, Mich., a corporation
of -Michigan
"Application December 3, 1936, Serial No. 114,008
15 Claims.
(Cl. A198--3’7)
1
2
This'device concerns 'a saïfety control for ‘hoists
vand circuit therefor, and has to do particularly
with a hoist adapted to «convey articles from one
with valve mechanisms for controlling the step by
step movement ofthe conveyor, including a direc
station to another and ‘means for controlling the
movement of said hoist in either direction between
the said stations.
The present device operates by means of a
tional stop control D. The endless conveyor unit
above referred to is illustrated and described in
detail in my copending application, Serial N o.
` stemmed Aug, 10, 1935.
Fluid under pressure is supplied by a pump
chain type conveyer hydraulically driven and sup
I, of the constant displacement‘type, supplying
plemented by a system of controls bothhydraulic
fluid from tank reservoir Z Linder pressure to
and electric, which is believed to be a new idea, 10 conduit 3. The pressure in conduit 3 is limited
when considered together with the safety lock
ing device.
by vented relief valve il which operates in the
following manner: Through small orince 5 in
An object of this invention -is to provide an
piston 5a the pressure inconduit 3 is transferred
automatic control of starting, stopping and direc
to chamber ü, causing a ‘balance between the said
tion of travel, when cert-ain requirements of these 15 chambers. With spring l set to an initial pres
functions are to be ri’uliilled, `said control being
sure >of approximately 20# per square inch, the
practically Tree of 4any parts that are `apt to get
resulting pressure 'to the >left of piston 5a, las
out 4’of order or lack >dependa‘bility in operation.
viewed in the drawings, is approximately 2G# per
Other objects will be ‘apparent from the `follow
square inch more than the normal operating
ing description ‘and ‘claims when considered to 20 pressure in chamber ‘6 and conduit 3. This pres
gether with the accompanying drawings.
sure to the leit of the valve urges it to closed
In the drawings:
position. The maximum relief pressure is con
Fig. `1 is a new chart largely diagrammatic. of
trolled by an emergency relief valve'ß, which by
a chain type hoist and circuit therefor, with the
the `adjustment of the spring- limits the pressure
control valves in section, and showing the relative 25 in chamber 6. If venting line ‘9 is connected to
position oi ‘valves at the iirst stage of operation or
the tank ror atmosphere, this removes the effect
with both stations loaded.
of pressure in chamber E, causing the pressure
Fig. la is ‘a diagrammatic illustration of the
in conduit 3 to fall to the pressure as limited
by spring 'l which is still acting o-n the piston.
hoist showing both stations loaded and the rela
tive position of the switches.
‘On diametrically opposite sides `of the auto
30
Fig, 2 is a view similar to Fig. l., showing the
matic control unit U ‘are located a cam lever a
relative position of ’parts `during the second stage
and a latch b and auxiliary control piston valves
of operation, or with the lower station empty.
A and B. The cam operated acceleration
. Fig. '2a is a view similar to Fig. la showing the
deceleration valve A is on the left hand side of
lower station empty 'and the'upper station. loaded. 35 the automatic control unit, as in Fig. l; and the
Fig. 3 is a‘view similar to Fig. l but illustrating
latch operated valve B is 'on the right siede of the
the position of various parts and operation of
automatic control unit. The valve B is connected
circuit during the downward ‘motion of the con
by conduits to a solenoid operated starting valve
veyor, both stations being empty and the article
C which is connected by conduit 3 to the pressure
in transit,
40 iiuid through the vented relief valve 4. V‘The
Fig. 3a is a view similar to Figs. la and 2c show
directional valve D is connected through conduits
ing both stations unloaded and a projectile in
I3 and i9 to the hydraulic motor H to control
transit.
the direction of movement of the hoist. The
The illustrated embodiment of this invention
above mentioned valves A, B, C and D Vhave
includes, a delivery station X which may be 45 intercommunicating connections. for reception of
termed an upper station, a loading or lower sta
a pressure fluid, and for actuation of the con
tion Y, and a chain type conveyor diagrammati
veyor when certain conditions exist.
`
cally illustrated ‘by the dotted line Z and oper
To better understand the operation of the cir
atively connected to a hydraulic motor diagram
cuit and control of the conveyor motor it is
matically illustrated as at H. The conveyor Z 50 thought best to set forth the primary conditions
which may be any kind of an endless conveyor
desirable for obtaining automatic control in a
unit, is adapted to be actuated simultaneously
predetermined direction, as follows:
with the shaft’l?, one end of which is operatively
(1) With the upper station iilled, and lthe ‘knob
connected to a hydraulic motor H and the other
of directional valve D set to lowering position,
cnd to an automatic control unit generally desig 55 Vthe ‘conveyor Z should` move downward only
nated U; ‘in other words, the drive is usually
when the lower station Y is empty.
from the hydraulic motor H through suitable
(2) With both upper and lower statioinsX and
Y ëmi?ty. it is important that nio motion of the
reduction gearing to the conveyor î.Z and to the
conveyor should ensue irrespective of îthe setting
control shaft T. The unit U also includes a
latch and cam mechanism operatively connected do; of the kno-b of directional control valve D.
2,407,693
3
4
(3) With both stations ñlled, as shown in
Fig. 1.a, it is important that no motion shall
through the line I8, ports I1 and I6 to the spring
Y
loaded back pressure valve 25, which offers a back
pressure to the return flow ofthe motor to pre
vent over-run when lowering. From the spring
loaded valve 25, the return ñuid has free access
ensue, irrespective of the setting of the directional
control valve D.
(4) With the upper station empty and the i)
directional control valve D set to “hoist” the mo
tion should be upward only when the lower sta
tion is filled.
The preferred means for deriving the required
results when any of the above listed conditions . .l
are met with, is what is commonly called a three
to the tank through conduit 33 and ports 3l and
II.
‘
point electric control circuit, embodying 'two
Now after motion has started in the downward
direction, as shown in Fig. 3a, the upper article,
being in transit, allows movement of switch S1
by reason of its spring 32 to divert the electrical
ñow of current from line E2 to E1, thereby de-en
two-way article sensitive limit switches S1 and S3
interposed by a four-way switch Sz, as will be
subsequently described. The switches S1 and S3
to return to normal as indicated. The member
i: U is provided with a cam lobe a’; the timing of
are so positioned adjacent the stations X and
Y as to be actuated or released by the presence
or absence of articles at the respective stations.
Figs. 1 and la illustrate the third condition
of operation, the upper station switch S1, being
correspondingly set for a filled condition. The
ergizing solenoid E5 and allowing starting valve C
the cam lobe a', actuating valve A, and the shift
ing of the electrical switch Si, are so arranged.
that a movement to the right of auxiliary con
' trol valve A precedes the shift of S1. The pur
pose of this timing relationship, or lost motion,
intermediate four-way switch S2 is attached to "
the directional control valve D to eifect a trans
is to allo-w a continued free flow of the return
fluid from the motor before the valve C returns
to normal. With the lobe of the cam beyond the
position of control wires E1 and E2 whenever
roller of valve A, spring 33‘ forces valve A to the
the directional control valve D is shifted. With s
the lower station two-way switch S3 set to a ñlled
right as limited by the dwell on the cam as shown.
With the valve A in this position the return fluid
position, the electrical circuit line Ea and E4 is
from the motor is directed from the conduit 30 to
opened causing a solenoid E5 to be ineffective.
the ports 34 and 35 to the tank conduit II. ‘By
Vreason of the venting ports 36 and 31 of valve C
With the Valves-B and C of Fig. 1 in the inactive
position, the venting line 9 through the corre
sponding ports is opened to the tank through
the channels 9, Ill and II allowing the described
-fall in pressure, by means of the vented relief
valve 4.
Figs. 2 and 2a illustrate the iirst condition of f
operation, the switches S1, Sz and S3 being so in
terconnected as to magnetically actuate the valve
C. With the knob of directional control valve D
set to lower, the movement of starting valve C
vto the left causes the following consecutive
functions. Fluid flow through the venting line 9
is cut ofi by closing ports 36 and 31 allowing the
pressure in conduit 3 to build up to the required
resistance. By this movement of the valve C the
pressure conduit 3 is opened through a conduit
I2 to port I3 of valve B and with a clear channel
to port I4 and conduit I5. With the directional
control valve D in the position shown in Fig. 2,
rconduit I5 is connected through ports I6 and I1
with a “lower” setting of the directional valve D, 50
and finally through the conduit I8 to tend to
drive the motor momentarily in a lifting direc
tion. At this described position of the valve D
the return ñuid is directed from channel I9
through the open ports 2U, 2I toI conduit 22>
through port 23, and open port 24, which finally
and ports I í) and 24 being connected in series,
venting of the relief valve is prevented and pres- `
sure maintained by the closure to port 24, re
gardless of the return of Valve C. With the re
turn of the valve C to normal the port 25 is di
verted to conduit II, a tank connection, allow
ing spring 38 to hold the latch against the pe
riphery of the notch plate, preparatory to its
ñnal mating with the notch at the termination
of the cycle to lock the» motor M against further
movement. With the latch dwelling on the pe
riphery of the said cam plate, the valve B still
maintains open channels ‘between the ports 29
and 23 and the necessary closure of conduit I3
to port I4, allowing a continuation of the down
ward motion of travel. The venting line 9 at the
referred position o-f the valve is still obstructed
by the closure of ports IIl and 24.
Nearing the completion of the cycle or the ter
mination of the downward movement, the tim
ing of the cam lobe a' with reference to valve
A is in advance of the iinal notching'of the latch
b for the purpose of maintaining motion to the
ultimate destination before conduit 9 is ñnally
vented to the tank.
In movingV to the left by the action of the cam '
lobe, valve A gradually retards the flow from
ports 34 to 35 by the metering action of a tapered
valve portion 33. After complete closurel ofthe
connects to the conduit I I, a tank connection.
>Pressure in the conduit I5 is maintained to the
required value by the spring loaded check valve ~ ports 34 and 35, motion to a lesser degree is still
`25, the function of which will be subsequently de- f 60 continued by a needle valve 4u, which shunts the
scribed mo-re in- detail. By a further movement
aforementioned ports and allows a restricted vol
of starting valve C, pressure conduit 3, through
urne to iiow from conduit 3i] to II. After slight
portl 26 and conduit 21, applies pressure to cham
continued motion the latch. b is allowed to drop
ber 28, effecting a withdrawal of the motor hold
into the notch of the cam plate to lock the motor
ing latch b. This withdrawal o-ccurs during the 65 M against further movement, causing the valve B
momentary lifting movement of the motor.
to move further to the left finally opening the
With the withdrawal of the latch b and at
venting line 9 through the ports Il) and 24 to the
tached valve B, the conduit 22 is diverted from
tank conduit II. In addition the conduit 22 is
the tank port 24 to the pressure conduit 29, effect
connected by reason of the ports 23 and 24
ing a reversal of the fluid flow to the motor, (see 70 through the `tank conduit II, preparatory for the
the position of valve B in Fig. 3).
next cycle. Coupled with the timing relationship
Momentarily after the valve B- is moved to the
`iust described, the switches Si and S3 again as'
right (as in Fig. 3), the starting valve C still re
sume the position as indicated by the loading c-on
mains to the left as shown in Fig. 2, allowing a
dition at that moment, as in Fig. la.
clear channel for the return fluid from the lïlfQlìQr 75
As previously mentioned the additional purpose
zof thespringloaded‘valve 2:54 is to eilect Va back
`.pressure in the return Achannel I8 on lowering.
It is .assumed Yin this circuit that the »back pres
.sure setting :of the valve 25 is of sufficient value
to .slightly raise or .sufficiently relieve 'the load
`'of the conveyor to .facilitate withdrawal `of the
latch. ,It will 'be noted that ‘with an .in‘suñicient
ipressure setting .of the valve 25 the iiuid 4for
A«momentary raising would `lay-pass ‘from conduit
I5 to `conduit 3.8. :By `reason of _the fact-that the
`pressuresetting of valve 25 must be suñicient to
-is emptyand the station. from which the conveyor
will move is loaded, ,a .locking wheel operatively
connected to ‘said motor, .a latch for engaging
:said 'wheel t'o ¿lock ¿said motor, and .means .con
`‘.n'ec'ted `to Vsaid .latch .and .operated by pressure
`directed from said .starting valve lfor .disengag
ing l said ‘latch :from said «wheel to .permit oper
ation .of'lsaid çmotor, .said 'starting valve 'being »ar
`ranged 'to «direct liquid .under pressure ’to operate
said latch ¿mean-s .only when -said :starting valve
Íproperly compensate "for the'unbalanced load, »it
.is‘s'hifted fromlit's `blocking position.
.
¿2. Inzahydraulic actuating and .control-system
'fis logical to‘assume that a slightly higher val?ue
for controlling the movements :of anendless lcon-
ywould. :be ~adequate A‘for the `-desired results. -`n
elongated -slot :4l in the `member .forming lobe
a’ is provided to permit adjustment »betweenlobe
-veyor hoist, .extending .between <spaced loading
a’ .and the notch‘of cam U..
@and .delivery stations, a 'pressure source, a 1re-
-versible conveyor :motor having ports inter»
tchangeable .as :pressure-exhaust '.p‘orts. .directional
valve means .for ¿selectively `.directing liquid `under
In operation, from the `>previously mentioned
four possible sets of conditionsexisting at .the
,pressure to'saidmotor Yports to cause hoisting or
loading stations, and the corresponding setting .2.0 »lowering :act-ion, hydraulic ‘conduits connecting
of the safety electrical switches Si and Sa, it will
be seen that it is impossible to actua-te the hoist
'until -the article at the delivery station has .been
removed. This will :prevent ’the article at .the
-delivery station from being >carried on around the
conveyor and possibly damaged, or if it should
said `pressure >source .and said directional lvalve
means, Va starting >valve ‘inzfsaid conduits adapted,
in one position, -tjo `blc-cl: .flow ‘of :pressure liquid
from said >source and, in another position, topass
:liquid from said Ásource to said directional valve
means, ya «locking wheel »operatively connected Ito
be `an `explosive such as a «can of nitro-glycerine,
`said motor, .a latch forengaging said wheel to
lock said Amotor against a `downward movement,
it will prevent .the movement »to .any .other un
lmeans connected .to said latch ‘and operable by
desired or dangerous position. Any standard
mechanism can .be iutilized foreiîecting .this auto 30 pressure directed from `the source through said
starting valve for -disengag-ing said latch `from
matic stop, and Aone .possible .structure .is shown
in all the drawings as `being .a solenoid, operat
said wheel, «and `a valve in said `conduits between
the starting valve .and the directional valve yop
ed by two two-point switches .interposed by a
ferable with said last named means and .adapted
four-way switch.
When the motor .is to .be moved in a .hoisting 35 to direct lifting pressure momentarily to said
motor .through said directional valve to permit direction, the directional valve TD _is .shifted ’from
its position as shown to a position connecting
withdrawal of :said latch from said wheel «and to
direct pressune thereafter to said motor through
line 22 with »line ll. AS .soon as auxiliary control
said `directional valve to eiîect lowering action,
valve B is .shifted .by pressure from valve ‘C to
the position shown in Fig. 3, pressure from 4line 40 said starting valvebeing arranged to'direct liquid
under pressure to operate said latch means only
3 will .eiîect a .hoisting .movement of the motor.
when .said star-ting «valve is shifted from its block~
This will continue until latch l) drops ‘in cam U
ing position.
to close line 3 from-line 122.
'.3. In ,a hydraulic actuating and control sys
From the present disclosure lit will thus be seen
tem 'for controlling 'the movements of .an endless
there has not only been produced .a combination
hoist conveyor extending 'between spaced upper
of station controls and cooperating valve con~
.and 'lower loading and delivery stations, a pres
trols suitable for the safe conveying .of articles,
but a mechanism that contains a minimum .num
sure source, `a »reversible hydraulic conveyor mo
ber of parts that might be apt to .require attenn
tor having two `ports interchangeable as pressure
tion or replacement.
What I claim is:
l. In a .hydraulic .actuating _and control sys
tem for controlling the movements of an endless
and exhaust ports, .a .directional valve means, an
conveyor vextending' ‘between -spaced loading and
conduits .to .be used interchangeably as `pressure
and Aexhaust conduits, a .tank conduit leading
delivery stations, a conveyor, a pressure source,
.auxiliary .control valve, supply .and return con
duits .connecting said directional valve with said
motor. and with said auxiliary control Valve, said
interchangeable as pressure-exhaust ports, direc
from said >directional control, a starting valve,
conduits connecting said starting valve with .said
tional valve means for selectively directing liquid
pressure source and with said auxiliary control
under pressure to said motor parts, a series of
valve, said starting valve being adapted in onepo
sition to ‘block flow of pressure liquid from vsaid
sourceand in another position to ‘pass liquid from
a reversible Aconveyor .motor having two ports
hydraulic conduits connecting .said pressure
source and said directional valve means, means
for limiting the pressure in .said conduits, a
starting valve in said .conduits adapted in one
position to block flow of pressureliquid from ,said
source `and .in another position to passliquid from
`said source to said .directional valve means, an
`actuating `means for said starting valve, article
responsive means `at `each of said stations to be
influenced by the presence -of an article at said
'stations and means operatively connecting .said »
.article responsive means and said .directional
valve means with said `starting valve actuating
means'whereby said starting valve `may be moved
from its pressure blocking ¿position only when
the station toward which the conveyor will move 7:5
said vsource to said auxiliary valve to actuate the
same, said auxiliary 'valve being adapted in one
position, ¿to pass liquid ‘under pressure Ito one of
Vsaid .conduits leading .to the directional `valvel and
1in another :position to pass pressure liquid tothe
other :of 4.said >conduits leading to said directional
valve, locking means operably connected with
said motor to prevent lowering, and means for
-.disengagíng »said lock-ing means, said valves co
operating to effect .momentary 4lifting action of
saildlconveyor motor to permit disengaging of said
latch, .and to effect thereafter a lowering action
.of .said motor,
,
4. In ahydraulic actuating and control system
7
2,407,693
8
for controlling the movements of an endless con
veyor hoist extending between spaced upper and
Vlower loading and delivery stations, a pressure
source, a reversible conveyor motor having one
port to be used as a pressure port for hoisting
and as an exhaust port for lowering, and a sec
ond port to be used as a pressure port for lower
ing and as an exhaust port for hoisting, a locking
means comprising a movable part operatively
connected with said motor, and a movable latch
for engaging said movable part to lock the same
against movement, means for withdrawing said
latch, and valve means to be automatically ac
tuated at the start o'f a lowering movement for
momentarily directing liquid under pressure to
the hoist pressure port of said motor to permit
withdrawal of said latch and thereafter directing
pressure to said lower pressure port.
5. In a hydraulic actuating and control system
for controlling the movements of an endless con
veyo1` hoist extending between spaced upper and
lower loading and delivery stations, a reversible
motor to serve as a power unit for said hoist, a
releasable holding means for said motor, means
for releasing said holding means, directional and
starting means responsive to load conditions, for
controlling the movement of said motor, and
means responsive to said directional and starting
means for causing a momentary hoisting action
open one of saidlines to the pressure lowering
motor port, a locking means for said conveyor
comprising a movable part and a latch for en
gaging said movable part, said auxiliary control
valve being adapted in one position to direct pres
sure through one of said lines to the pressure
hoisting port of said motor to effect momentary
lifting movement to permit release of said latch
means, and in another posi-tion, to effect lower
ing of said hoist, and a starting control valve in
said system adapted in one position to block flow
of pressure liquid from said source, and in a sec
ond position to pass pressureliquid from said
source to said auxiliary valve to shift the same
from the momentary lifting position to a pressure
lowering position.
8. In a hydraulic actuating and control system
for controlling the movements of an endless con
veyor extending between spaced loading stations,
a liquid supply tank, a pressure source, a con
veyor motor, lines between said motor and said
pressuresource, a starting control valve in said
lines, an auxiliary line between said valve and
said tank, and a relief valve connected to said
lines between said starting control valve and said
pressure source, said relief valve comprising a
housing provided with a cylinder connected at
one end by said lines to the pressure source and
to the tank and connected at a second end by
of said motor before a lowering action to permit 30 said lines to said starting control valve, a piston
release of said holding means.
shiftable in said cylinder having a restricted pas
6. In a hydraulic `actuating and control system
sageway therethrough andV means thereon for
for controlling the movements of an endless con
normally blocking the tank connection of the
veyor hoist extending between spaced upper and
cylinder, said starting control valve being adapted
lower loading and delivery stations, a pressure 35 in one position to permit flow of pressure liquid
source, a hydraulic motor having one port to be
from the source to said motor and to close said
used as a pressure port for hoisting and an ex
second end of the relief valve cylinder from the
haust port for lowering, and a second port to be
tank, and in a second position to block ñow of
used as pressure port for lowering and an exhaust
pressure liquid from the pressure source and to
port for hoisting, an auxiliary control valve, hy 40 open the second end of the relief valve cylinder
drau’lic connections between said valve and said
to the tank, whereby pressure liquid from the
pressure source, two conduit lines connecting said
pressure source may actuate said relief valve pis
auxiliary valve with said- motor ports, a direc
ton to open the tank connection of the cylinder
tional valve in said two lines adapted in one po
and bypass the pressure flow, means associated
sition to open each of said motor ports, respec 45 with said motor for controlling the directionof
tively, to a connecting line leading to the auxil
movement thereof, and auxiliary means asso
iary control valve, and in another position to open
ciated with and responsive to movement of said
one of said lines to the pressure lowering motor
starting valve for directing liquid under pressure
port, a locking means for said conveyor compris
momentarily to drive said motor in one direction
ing a movable part and a latch for engaging said 50 immediately prior to prolonged movement in the
movable part, said auxiliary control valve being
adapted in one position to direct pressure through
one of said lines to the pressure hoisting port of
said motor to effect momentary lifting movement
to permit release of said latch means, and in an
other position, to effect lowering of said hoist,
and means to effect shifting of said auxiliary
valve.
'7. In a hydraulic actuating and control system
for controlling the movements of an endless con
veyor hoist extending between spaced upper and
lower loading and delivery stations, a pressure
source, a hydraulic motor having one port to be
used as a pressure port for hoisting and an ex
haust port for lowering, and a second port to be
used as a pressure port for lowering and an ex
haust port for hoisting, an auxiliary control valve,
hydraulic connections between said valve and
said pressure source, two conduit lines connecting
said auxiliary valve with said motor ports, a di
rec‘tional valve in said two lines adapted in one Y
position to open each of said motor ports, respec
tively, to a connecting line leading to the aux
iliary control valve, and in anotherY position~ to
other direction.
9. In a hydraulic actuating and control system
for controlling the movements of an endless con
veyor hoist extending between spaced loading
55 stations, a liquid supply tank, a pressure source,
a conveyor motor, directional means associated
with said motor movable to a lifting or lowering
position for controlling the direction of move
ment thereof, an auxiliary contro1 valve, a start
60 ing valve, lines connecting said valves, pressure
source and directional means, said valves being
arranged to cooperate in one position to block
pressure flow from said source to said directional
means, and each being movable to a second posi
tion to permit flow through said lines to cause a
momentary lifting movement and a prolonged
lowering movement of said motor when said di
rectionalmeans is set for lowering movement and
a prolonged lifting movement when said direc
tional means is set for lifting movement.
l0. In a hydraulic actuating and control sys
tem for controlling the movements of an endless
conveyor hoist extending between spaced loading
stations, a liquid supply tank, a pressure source,
a conveyor motor, directional means associated
2,407,693
with said motor movable to a lifting or lowering
position for controlling the direction of move
ment thereof, an auxiliary control valve, a start
ing valve, lines connecting said valves, pressure
10
same and to effect closing of said relief valve,
means for maintaining said control valve in
shifted position for a predetermined movement
of said motor, said control valve being adapted,
source and directional means, said valves being
when in one position, to direct pressure from
arranged to cooperate in one position to block
said starting valve to said directional means to
effect momentary movement of said motor in
one direction, and, when shifted, to direct pres
pressure flow from said source to said directional
means, and each being movable to a second posi
sure from said source to said directional means
tion to permit ilow through said lines to cause a
momentary lifting movement and a prolonged 10 to effect prolonged movement of said motor in
the other direction.
lowering movement of said motor when said di
14. In _a hydraulic actuating and control sys
rectional means is set for lowering movement and
tem for controlling the movements of an endless
a prolonged lifting movement when said direc
conveyor extending between spaced loading sta
tional means is set for lifting movement, a relief
tions, a pressure source, a conveyor motor, direc
valve in said lines normally maintained in closed
tional means associated with said motor to con
- position by pressure, said starting and auxiliary
trol the direction of movement thereof, a start
control valves being adapted to control the pres
ing valve, an auxiliary control valve, lines con
sure closing said relief valve whereby said relief
necting said valves, pressure source, and direc
valve will remain open until said starting valve
tional means, said starting valve being adapted
is shifted.
to be momentarily shifted in response to certain
11. In a hydraulic actuating and control sys
load conditions at said stations to direct pres-V
tern for controlling the movements of an endless
sure from said source to said auxiliary control
conveyor hoist extending between spaced loading
valve to shift the same, means for maintaining
stations, a liquid supply tank, a reversible con
said control valve in shifted position for a pre
veyor motor, a pump, a hydraulic control circuit ,
for directing pressure from said pump to said Ino
determined movement of said motor, said control
valve being adapted, when in one position, to
tor, and means for controlling the speed of said
direct pressure from said starting valve to said
motor at predetermined times in the cycle of
directional means to effect momentary move
movement of said conveyor comprising a decel
eration valve adapted in one position to pass ex 30 ment of said motor in one direction, and, when
haust liquid from said motor to the tank, and
shifted, to direct pressure from said source to
means responsive to the movement of said motor
said directional means to effect prolonged move
for shifting said valve to cut off gradually the ex
ment of said motor in the other direction, and
valve means for controlling the pressure uti
haust flow to the tank, and a second valve means
located in parallel with said deceleration valve
lized for said momentary lifting.
l5. In a hydraulic actuating and control sys
and adapted to further restrict the flow of ex
haust liquid upon the shifting of said deceleration
tem for controlling the movements of an. endless
conveyor extending between spaced loading sta
Valve.
l2. In a hydraulic actuating and control sys
tions, a supply tank, a pump, a supply line lead
tem for controlling the movements of an endless 40 ing from said pump, a relief valve in said supply
conveyor extending between spaced loading sta
line comprising a `piston valve for closing said
supply line from the tank and a pressure cham
tions, a pressure source, a conveyor motor, direc
ber behind said valve for holding it in closed
tional means associated with said motor to con
position, a starting valve and an auxiliary valve,
trol the direction of movement thereof, a start
ä each connected to said supply line, a conveyor
ing valve, an auxiliary control valve, lines con
motor to be operated by pressure from said pump,
necting said valves, pressure source, and direc
tional means, said starting valve being adapted
receiving lines connecting said auxiliary control
to be momentarily shifted in response to certain
load conditions at said stations to direct pres
valve and said motor, a directional valve in said
receiving lines for directing pressure to and from
sure from said source to said auxiliary control
valve to shift the same, means for maintaining
said control valve in shifted position for a pre
said motor, said starting valve being adapted in
one position to connect said relief valve pres
sure chamber through said auxiliary control
valve to the tank and to block flow from the
determined movement of said motor, said control
supply line leading thereto and being shiftable
valve being adapted, when in one position, to
direct pressure from said starting valve to said 55 to a second position to close said relief valve
directional means to eñect momentary move
pressure chamber, and to open said supply line
to a receiving line through said auxiliary control
ment of said motor in one direction, and, when
valve and to direct pressure to said auxiliary con
shifted, to direct pressure from said source to said
trol valve to shift the same, said auxiliary con
directional means to effect prolonged movement
60 trol valve being adapted in one position to block
of said motor in the other direction.
the supply line leading thereto and to pass pres
13. In a hydraulic actuating and control sys
sure ñow from the starting valve to a receiving
line to effect momentary movement of said mo
tor in one direction, and being shiftable by pres
stations, a pressure source, a conveyor motor,
directional means associated With said motor, to 65 sure from said starting valve to a seco-nd posi
tion in which said supply line is open directly to
control the direction of movement thereof, a
another of said receiving lines to effect a move
starting valve, an auxiliary control valve, lines
ment of said motor in the other direction, and in
connecting said valves, pressure source, and di
which said relief valve pressure chamber is closed,
rectional means, a p-ressure controlled relief valve
and means responsive to movement of said motor
in said lines associated .with said starting valve,
for maintaining said auxiliary control valve in
said starting valve being adapted to be momen
said second position for a predetermined move
tarily shifted in response to certain load condi
tions at said stations to direct pressure from said
ment of said motor.
tem for controlling the movements of an end
less conveyor extending between spaced loading
source to said auxiliary control valve to shift the
HARRY F. VICKERS,
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