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Патент USA US2404058

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July'i?, 1946.
L. D. HAGENBOOK
2,404,058
SHAKER GONVEYER
Fil-ed Nov. 16,- 1944v
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ATTORNEY
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1.: D. HAGENBOOK
2,404,058
SHAKER CONVEYER
Filed Nov. 16, 1944
3 Sheets-Sheet 2
July 16, 1946.
2,404,058‘
L. D. HAGENBOOK
SHAKER CONVEYER
Filed NOV‘. 16, 1944
3 Sheets-Sheet 3
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Patented July 16, 1946
2,404,058
parish stares rarest orgies
2,404,058
SHAKER CONVEYER
Loy D. Hagenbook, Chicago, 111., assignor to Good
man Manufacturing Company, Chicago, 111.,
a corporation of Illinois
Application November 16, 1944, Serial No. 563,633
23 Claims. (Cl. 198—--220)
1
2
This invention relates to improvements in
feeding mechanisms for shaker conveyers and
that shown in Figure 2; showing the pump for
effecting ?uid pressure in the system in longi
has as its principal objects to provide a new
and improved feeder head for shaker conveyers
of the friction grip type, including a novel form
of hydraulic operating and control means there
tudinal section;
Figure 4 is an enlarged partial fragmentary
troughs heretofore caused by an uneven gripping,
transverse sectional View showing certain details
of the pump for effecting ?uid pressure in the
system, which are not shown in Figure 3;
Figure 5 is a partial fragmentary View of the
feeder head in side elevation with certain parts
broken away and certain other parts thereof
action and to provide a more positive and efficient
shown in substantially longitudinal section;
feeding means than formerly.
In carrying out my invention I mount a pair
substantially along line 6-6 of Figure 1;
for so as to provide a uniform gripping action
on each side of the extensible trough of the
conveyer, to eliminate binding between the
of friction grip blocks on each side of an ex
tensible trough of a shaper conveyer and re
Figure 6 is a transverse sectional View taken
Figure 7 is a longitudinal sectional view taken
15 through the valve for supplying ?uid under
ciprocably drive these grip blocks by a recipro
cating trough of the conveyer, and provide a ?uid
pressure cylinder and piston for each pair of
pressure to operate the grip blocks, showing cer
tain details of said valve and the operating
means therefor;
‘ Figure 8 is an enlarged detail partial frag
grip blocks for positively engaging the grip
blocks with the extensible trough during alter 20 mentary transverse sectional View showing cer
tain details of the friction gripping means for
nate strokes of the conveyer, to extensibly or
operating the control valve shown in Figure 7;
retractibly move the extensible trough with re
spect to the reciprocating trough.
Figure 9 is a transverse sectional view taken
substantially along line 9—9 of Figure 7;
I also provide a ?uid pump operated by re~
Figure 10 is a transverse sectional View taken
ci-procable movement of the conveyer and pro 25
substantially along line I0—l0 of Figure‘ '7, but
vide a booster means operable by reaction of
showing the means for operating the valve in a
the extensible trough against the ground, to
dilferent'operative position than in Figure 9;
boost the pressure provided by the pump to re~,
Figure 11 is a fragmentary horizontal sectional
view taken substantially along line Il—-ll of
Figure 5, and showing certain details of the
booster cylinder and piston for boosting the pres
movement of the conveyer, for supplying ?uid
sure of the ?uid used to apply the grip blocks,
under pressure to said ?uid pressure cylinders
and for releasing pressure from said grip blocks
and pistons, to move the grip blocks to a grip
ping position during alternate strokes of the 35 upon overload;
conveyer, and operated by control levers which
Figure 12 is a longitudinal sectional view taken
are stationary during reciprocable movement of
through the booster cylinder and piston shown
the conveyer.
in Figure 11 but showing the booster cylinder
These and other objects of my invention will
in a released position; and
duce the required capacity of the pump used
for supplying pressure to the system, together
with a control valve operated by reciprocable
appear from time to time as the following 40
Figure 13 is a diagrammatic View showing the
speci?cation proceeds and with reference to the
?uid
accompanying drawings wherein:
mechanism.
>
diagram
for
operating
the
feeding
‘
Figure 1 is a fragmentary plan view of a feedIn the drawings, the main elements of my in
er head constructed in accordance with my invention illustrated‘ include a reciprocating trough
vention, shown as being connected between the 45 I0 having an extensible trough H mounted for
a
extensible or retractible movement with respect
shaker conveyer, with certain parts of the feeder
reciprocating
and
extensible
troughs
of
thereto. > Said extensible trough has a ?ared
head‘ broken away and certain other parts shown
in horizontal section;
gathering shovel I2 at its forward end, and said
reciprocating trough is connected to the inby end
Figure 2 is a fragmentary view in side eleva- 50 of a shaker conveyer trough line through a
tion of the feeder head shown in Figure 1, with
swivel (not shown) ,_ to permit lateral movement
certain parts thereof shown in substantially
of said reciprocating and extensible troughs to
longitudinal section;
'
Figure 3 is a fragmentary view in side eleva-
enable said shovel to pick up material from the
far corners of a working place, as is clearly illus
tion of the opposite side of the feeder head from 65 trated and described in Patent No. 2,360,169,
2,404,058
3
4
which issued to W. W. Sloane October 10, 1944.
A frame l3, connected at its rear end to the
swivel, extends along opposite sides of the re
move said piston into a centered position when
?uid pressure is relieved from said cylinder. The
function of said booster cylinders, besides caus
ing its associated carrier member 25 to recipro
cably move with the reciprocating trough I0, is
said troughs laterally about their swivel upon
to supply ?uid pressure to operate the feeding
lateral movement of said frame. Said frame and
mechanism in addition to that obtained by the
its connection to said swivel is clearly shown in
pump of the ?uid pressure system,.to enable a
the aforementioned Patent No. 2,360,169, so will
small and compact pump and accumulator to be
not herein be shown or described except to point
out that it includes a pair of independent tubu 10 used. This added pressure is obtained by the
reaction of the shovel l2 and extensible trough
lar arms M, M extending along each side of the
ll against the ground, as will hereinafter more
reciprocating trough 10. Each of said arms is
clearly appear as this speci?cation proceeds.
supported adjacent its forward end between a
The feeding mechanism includes the carrier
pair of vertically laterally spaced rollers l5, l5.
Said rollers have convex engaging surfaces 15 members 25, 25, each of which carrier members
is provided with an upper grip block 43, adapted
adapted to engage opposite sides of one of said
to be engaged with the upper side of the bearing
arms. Said rollers are mounted between the
plate 22 by means of a lower grip block 44, which
furcations of a’ bifurcated supporting bracket l6
is adapted to engage the underside of said hear
on vertical pins H, H. Said support bracket is
ing plate. Said lower grip block is slidably
herein shown as being transversely pivoted to
mounted in a guide 4!, formed in said carrier
and projecting outwardly from the forward end
member, and has a concave lower socket portion
of a frame I9, on a transverse shaft 20. Said
42 pivotally mounted on the convex upper end
frame is secured to and extends across the bot
of a piston rod 45. Said piston rod is extensible
tom of and upwardly along opposite sides of said
ciprocating and extensible troughs for moving
reciprocating trough and extends forwardly of 25 from a cylinder 46 and extends upwardly from a
piston 4'! movable within said cylinder.
the forward end thereof. The forward ends of
The upper grip block 43 is slidably mounted
said independent arms are provided with sheaves
in a vertically extending guide 49 formed in an
2|, 2| about which ?exible cables (not shown)
upwardly projecting portion 50 of the carrier
are adapted to be trained, for feeding the recip
rocating and extensible troughs laterally upon 30 member 25. An adjusting screw 5|, threaded in
the upper end of said upwardly projecting por
the application of power to either of said cables,
tion, is provided to engage the upper side of said
upper grip block and form an adjusting means
when said cables are connected to ?xed abut
ments remote from said arms, as is clearly shown
and described in the aforementioned Sloane Pat
ent No». 2,360,169.
The extensible trough II has a pair of bearing
plates 22, 22 extending along its upper outer sides
and secured to and projecting laterally from said
sides. Said bearing plates also have the forward
end of the reciprocating trough slidably sup
ported thereon and extend between spaced roll
ers 23, 23 mounted in upwardly extending rear-'
wardly disposed brackets 24, '24 of carrier mem
bers 25, 25.
The carrier members 25, 25 are pivotally con
nected to- opposite sides of the frame l9 by means
of links 26, 26'. Each of said links is pivotally
connected to one. side of said frame adjacent
its ‘lower end by means of a pivotal pin 21, and
is pivotally connected to its associated carrier
member adjacent its upper end by means of a
pivotal pin 29.
(See Figure 5.)
The links 26, 26 are held in a substantially up
right position to reciprocably move the carrier
therefor.
35
'
The cylinders 46, 45 are herein shown as being
mounted in the lower portion of said carrier
member and as having fluid passageways 51, 5‘!
extending to their head ends, for the admission
of ?uid under pressure, to cause movement of
40 the piston 41 in a direction to positively engage
the grip blocks 44, 44 with the underside of the
bearing plates 22, 22. A passageway 59 leads to
the‘ piston rod end of said cylinder, to admit
?uid to positively release said lower grip block
45 from the underside of said bearing plate. (See
Figure 5).
Fluid under pressure, such as oil, is supplied to
the ?uid system by means of a ?uid pump 66
operated by reciprocable movement of the con
50 veyer.
Said pump is herein shown as being a
well known form of piston pump including an
upright cylinder 6| mounted on the right-hand
side of the frame l9, adjacent the rear end there
of, by means of a bracket 62' which is formed in
members 25, 25, with the reciprocating trough 55 tegrally with said cylinder. A piston 63 slidably
mounted in said cylinder has a piston rod 64 de
Ill, upon reciprocable movement of said trough,
pending therefrom. A roller 65 is mounted on
by means of piston rods 30, 3B. Said piston rods
the lower end of said piston rod between the
are pivotally connected to said links intermediate
furcations of a bifurcated lower end thereof, on
the ends of said links by means of pivotal pins
3!, 3|, and are extensible from booster cylinders 60 a transversely extending pivotal pin 66. Said
roller is adapted to ride along and engage the
33, 33 which are disposed rearwardly of said links,
upper side of a longitudinally extending cam 61,
and are pivotally connected adjacent their rear
mounted on the right-handarm M of the frame
ends to the frame I9 by means of pivotal pins 34,
I3, on the inner ends of brackets v59, 69 se
34. Said last mentioned pivotal pins extend
through spaced connecting ears 35, 35, extend 65 cured to the inner side of said arm and extend
ing inwardly therefrom. The surface of said
ing rearwardly from said cylinders and inter
cam is a sloping curve which slopes uniformly
leaving a connecting lug 350 extending forwardly
upwardly from its opposite ends to a relatively
from a laterally extending upright wall 36 of said
?at curved peak at its center. Said cam being
frame l9. A piston 31 movable within said
booster cylinder is connected to the inner end of 70 stationary during reciprocation of the conveyer,
relative movement between said cylinder and cam
said piston rod, and springs 39 and 40 are inter
will cause the piston ‘63 to rectilinearly move
posed between opposite ends of said pistons and
within the cylinder GI and supply pressure to the
opposite end walls of said cylinder, to move said
piston to a centered position in said cylinder.
?uid system.
Said springs are each relatively heavy and tend to 75
An inlet passageway 10 having a check valve
5
$404,058
6
‘II therein is provided in the block of the cylin
der ill, to admit fluid to said cylinder, while an
outlet passageway 72 having a check valve 13
therein is provided for the release of ?uid under
diate its ends, and extends inwardly towards the
pressure from said cylinder. A ?uid pressure
line ‘I5 connects said outlet passageway with the
block of said valve. Said link is pivotally con
nected to a lug IIlIl extending upwardly from the
pressure side of an accumulator ‘It, for building
block of said valve.
connected to the lower end of a lever arm I30
by means of a pivotal pin IIlI. A link I83 is piv~
otally connected to said lever arm interme
up pressure therein. A suction line ‘I6 connects the
Thus, the pivotal axes of the lever arms 90 and
inlet passageway ‘Ill with the low pressure side
III!) are on opposite sides of the valve stem 89,
of said accumulator. Said low pressure side of 10 so that when the lever Gil is pivoted in a direction
said accumulator serves as a fluid storage tank for
the iluid system. Said accumulator may be of
any well known form and is herein diagram
matically shown as being a well known form of
spring type accumulator, but is not herein shown
or described in detail since it is no part of my
present invention. ' Said accumulator is shown in
which in Figure 7 is towards the right, the valve
spools 8? and 88 will be moved towards the right,
and when the lever arm Iilll is pivoted in the same
direction, the valve spools 8'! and 88 will be moved
towards the left.
An operating bar I65, held from reciprocable
movement, is provided to operate either of the
lever arms 96 or IIIEI. Said operating bar extends
through an apertured. portion I E6 of the lever
Figure 3 as being mounted on the frame I9 be
neath the pump 60 and extending to the rear of
said frame.
20 arm 90 and through an apertured portion Iii? of
A control valve ‘I9 is provided to control the ad
the lever arm Hill. A friction engaging connec
mission and release of ?uid to and from the head
tion is provided between said lever arms and said
and piston. rod ends of the cylinders '35, 45, and
operating bar, to cause operation of said lever
is connected with the pressure side of the pump '
arms and valve by relative movement between
Eli and the high pressure side of the accumulator
said valve and operating bar. (See Figures 8, 9
and 10). Said engaging connection includes two
provided
“Ill by means
in said
of a’pipe
pipeto80.
prevent
A check
the valve
backing
El up
aligned leaf springs I98, I08, secured to the rear
of ?uid pressure into said accumulator upon oper
face of the lever arm 99 and curved inwardly to
extend inwardly along the apertured portion Ill’é
ation of the booster cylinder 33. A return pipe
82 connects the return side of said valve with the 30 of said lever arm. Said leaf springs are herein
shown as being intersected at their center by a
low pressure or tank side of said accumulator.
radial line spaced 45° in a clockwise direction
The control valve ‘I9 may be a well known form
of closed center 4-way piston valve having a pres~
from the vertical center of said lever arm. In a
like manner, two aligned leaf springs IE9, Hi8 are
sure passageway 83 therein connected with the
secured to the right-hand, or rear, face of the
head ends of the cylinders 45, 45 by means of a
lever arm I90 and extend inwardly along the
pressure line M, for supplying ?uid under pres"
apertured portion It? thereof. Said leaf springs
sure to said cylinders, to move the grip blocks MI,
44 into a position to engage the bearing plates 22,
are intersected at their center
a radial line,
disposed 45° from the Vertical axis of the lever
22 with the undereides of the grip blocks 43, 63.
Said valve also has a passageway 85 therein, 40 arm I89 in a counterclockwise direction. Thus,
when the bar IE5 is pivoted 45° in a clockwise
which is connected with the piston rod ends of
direction, the springs see, I538 will engage opposite
the cylinders 46, 455 by means of a pipe 85, to
sides of said bar, to reciprocably move the lever
supply ?uid under pressure to said piston rod
arm 9d by relative movement between the valve
ends of said cylinders, to move the grip blocks
19 and said operating bar. Pivotal movement of
M, till to a released position. Two spaced spools
said bar I25 45° in a counterclockwise direction,
El and 38 formed integrally with a valve stem 89
will cause the springs I69, I09 to engage opposite
are slida‘oly movable in the chamber of said valve,
sides of said bar to reciprocably move the lever
to admit fluid under pressure from the pipe 89
arm IIIG about its, axis of connection to the link
to either of the pressure passageways 83 or 85, or
I533 by relative movement between said valve and
to release ?uid from either of said passageways to
operating bar, and will operate said valve in
the low pressure side of the accumulator ‘M
opposite phase ‘relation from the lever arm 98.
through the pipe 82.
The operating bar I95 is pivctally moved by
The stem. 89 of the valve spools 8'! and 88 ex
means of a control handle llil, secured to the
tends outwardly in opposite directions from said
valve spools, beyond the outer ends of the block 55 outer end of a shaft III formed integrally with
and extending forwardly of the forward end of
of said valve. An eye 8% is formed on the left
said bar. Said shaft is pivotally mounted in a
hand end of said valve stem. Said eye is pivotally
boss I I2 formed on the upper end of a bracket
connected to an operating lever arm Bil, inter
II 3 extending inwardly and upwardly from the
mediate the ends of said lever arm, by means of
a pivotal pin Ill. Said lever arm is pivotally con 60 arm Ill- of the frame I3. A lever arm I Ill extends
nected at its lower end to a link 54. Said link
downwardly from said shaft and is connected to
extends from said lever arm towards the block of
a similar lever arm on the opposite side of the
the valve ‘IS, and is pivotally connected at its end
frame I3 from the operating handle Ill}, by
opposite from said lever arm to an ear 95 de
means of a transversely extending link 6 I5. Said
pending from the lower side of the block of said 65 lever arm on the ‘right-hand side of the machine
valve. A lug 96 projects upwardly from the block
is mounted in a bracket IIE extending inwardly
of said valve and has a spring 9'! connected there~
and upwardly from the right~hand arm M, and is
to at one of its ends, and connected to the lever
provided with an upright operating handle II'I,
99 at its opposite end. Rocking movement of
to permit operation of the operating bar I55 and
the lever 88 will thus move the spools 81 and 83
the control valve ‘I9 from either side of the frame
back and forth in the block of said control valve,
I3.
and the spring 9”! will tend to move said piston to
Thus, when the operating handle H6 is moved
a neutral position.
45° in a clockwise direction to position A shown
The right-hand end of the valve stem 89 has an
in Figure 9, relative movement between said valve
eye 89I formed on its outer end, which is pivotally
and bar'will cause the valve spools Ill and 33 to
2,404,058
8
move back and forth within the chamber of said
valve, to admit ?uid under pressure through the
passageway 83 and pressure line 84 to the head
ends of the cylinders 46, 46 and to release ?uid
from the piston rod ends of said cylinders
through the pipe 36, passageway 35 and return
line 82, during the forward strokes of the con
veyer. This will engage the grip blocks 44, 44
with the undersides of the bearing plates 22, 22
During the return strokes of the conveyer, the
supply of ?uid in the head ends of the cylinders
33, 33 is replenished by suction developed by
movement of the pistons 31, 31 towards the piston
rod. ends of said cylinders. During such move
ment of said pistons the suction created in the
head ends of said cylinders draws ?uid from the
low pressure side of the accumulator 14 through
pipes I25 and I26 connected with the block of
during the forward strokes of the conveyer. 10 said valve and through a passageway I21 in the
block of said valve leading to the head end of
During the return strokes of the conveyer, said
said cylinder. A check valve I28 is provided in
valve piston will be moved to admit ?uid under
said passageway to prevent ?uid under pressure
pressure through the passageway 85 and pipe 86
from being discharged through said passageway.
to the piston rod ends of said cylinders, and to
Fluid is replenished in the piston rod ends of
release ?uid from the head ends of said cylinders, 15
to disengage said grip blocks from said bearing
plates. This will extensibly move said extensible
trough with respect to said reciprocating trough.
When the control lever II!) is moved 45° in a
said cylinders by suction developed in said ends
of said cylinders by the pistons 31, 31 during the
forward strokes of the conveyer. During these
strokes of the conveyer, ?uid is sucked into the
piston rod ends of each cylinder 33 through a
counterclockwise direction to position B shown
passageway I29 connected with the passageway
in Figure 10, relative movement between said
121 on the suction side of the check valve I28. A
valve and operating bar will cause reciprocable
check valve I30 is provided in said passageway to
movement of the valve stem 89 and valve spools
prevent the discharge of fluid under pressure
81 and 38, 'to admit ?uid under pressure to the
head ends of‘the cylinders 43, 43 and to release 25 through said passageway.
When the grip blocks .44, 44 are disengaged
?uid from the piston rod ends of said cylinders
from the bearing plates 22, 22, the springs 39 and
during the return strokes of the conveyer, and to
40 will move the associated piston 31 to a cen
admit ?uid under pressure to the piston rod ends
tered position with respect to its cylinder.
of said cylinders and to release it from the head
A sleeve valve is provided in the head end of
ends of said cylinders during the forward strokes 30
each cylinder 33 to release pressure from the
of the conveyer, to retractibly move said exten
head end of the associated cylinder 46 when the
sible trough with respect to said reciprocating
shovel I2 engages a solid obstruction during the
trough.
forward strokes of the conveyer. Said sleeve
Referring now to Figures 11 and 12 illustrat
ing the booster cylinder 33, when the grip blocks 35 valve includes a hollow valve sleeve I32 slidably
mounted in the head end of said cylinder and
44, 44 hold the bearing members 22 in engage
moved to a closed position by a compression
ment with the grip blocks 43, 43, frictional resist
spring I33 in a spring chamber I34, in alignment
ance of the extensible trough II and the shovel
with said cylinder and valve sleeve. The end
I2 against the ground will tend to move the pis
tons 31, 31 towards the head ends of said cylin 40 of said valve sleeve adjacent said piston is open
to admit ?uid therein, and the end of said sleeve
ders. Said cylinders are filled with a hydraulic
opposite said piston is closed to permit ?uid un
?uid, such as oil, at all times so that movement
der pressure to move said sleeve to the right
of said pistons towards the head ends of said cyl
against the spring I33. Said right-hand end of
inders will build up the pressure of the ?uid
therein until a predetermined pressure is 45 said sleeve is herein shown as being ?anged to
reached, when ?uid under pressure will be re
form a seat for the left-hand end of the spring
I33. Said valve sleeve is provided with cross—
drilled passageways I35, I35 near the right-hand
end of said valve, to permit the release of fluid
through the spring chamber I34. Said valve
sleeve is also cross~drilled intermediate its ends
formed in the block of said booster cylinder, a
at I36, to release ?uid from the piston rod end
check valve H9, and a passageway I2I connected
of the cylinders 46, 46 upon overload thereof,
with said pipe 84. This will increase the pres
through a passageway I31 connected with the
sure in said cylinders 43, 46 over that supplied by
the accumulator 14, to give a positive gripping 55 passageway I2I.
When the shovel I2 engages a solid obstruction,
action to said grip blocks, without necessitating
?uid under pressure in the head end of the cylin
the use of a high capacity pump and accumula
der 33 will move the hollow valve sleeve I32 to the
tor. Said check valve I I9 is of a well known ball
right a distance sufficient to release fluid to the
type of check valve, the spring of which is of suf
?cient strength to hold pressure in said booster 60 low pressure side of the accumulator 14 through
leased through the pipe 84 to the head ends of
the cylinders 46, 46. Fluid under pressure is re
leased from each of said booster cylinders to said
cylinders 46, 43 through a passageway II8 50
cylinder until the desired predetermined pressure
the cross-drilled passageways ‘ I35, 635, formed
in said sleeve adjacent the right-hand end there
of. Fluid being released through said passage
ways will pass into the spring chamber his and
out of said chamber through a passageway I39,
past a check valve I40, through a passageway
of the pistons 31, 31 towards the piston rod ends
I4I connected with the passageway I21, and out
. of the cylinders 33, 33. This will build up pres
said last named passageway to the low pressure
sure within thepiston rod ends of said cylinders
side of said accumulator through the pipes I23
until a predetermined pressure is reached when
?uid under pressure will be released from each of 70 and I25. Fluid will also be released from the
head ends of the cylinders 46, 45 through the
said cylinders through a passageway I22, check
pressure line 84, pressure passageways I2I. 12!,
valve I23, and passageway I24 connected with
the passageways I31, I31, cross-drilled passage
the passageway I2I, and to the pressure line 84
is reached therein.
During the return strokes of the conveyer, fric
tional resistance of the extensible trough II and
shovel I2 against the ground will cause movement 65
and head ends of the cylinders 46, 46, to boost the
pressure supplied thereto by the accumulator 14.
ways I36, I36 in the valve sleeves I32, I32,
through the insides of said valve sleeves and out
9
2,404,058
said sleeves through the cross-drilled passage
ways I35, I35, and to the return through the
passageway I39, check valve I40, passageway
10
reciprocating trough, an extensible trough, and
means for moving said extensible trough relative
to said reciprocating trough including two fric
tion grip blocks reciprocably moved by one of
said troughs and disposed on each side of the
other of said troughs for engagement therewith
during alternate strokes of the conveyer, and
?uid‘operated means for moving said grip blocks
to a gripping position during alternate strokes
MI, pasasgeway I21, to and through the pipes
I26 and I25.
The spring of the check valve M0 is strong
enough to hold pressure in the spring chamber
I34 until the pressure therein is considerably
greater than the pressure furnished by the ac
cumulator M, to prevent the release of pressure 10 of the conveyer including a ?uid cylinder and
through the sleeve valve at the pressures fur
piston on each side of said trough, said cylinders
nished by the accumulator, or at the pressures
each having operative connection with one of said
normally provided by the booster cylinder, to
grip blocks, a ‘pump for supplying ?uid under
extend or retract the extensible trough.
pressure to said cylinders, and valve means con
It may be seen from the foregoing that a sim
15 nected between said pump and cylinders and
ple and efficient ?uid pressure operated feeding
operated by reciprocable movement of the con
means has been provided for extending the ex
veyer to supply ?uid to said cylinders to move said
tensible trough of a shaker conveyer trough line
grip blocks into a gripping position during alter
and for feeding a shovel on the forward end of
nate strokes of the conveyer.
this trough into the loose material it is desired 20
3. In a feeding device for shaker conveyers,
to load, and that this feeding device is so ar
a reciprocating trough, an extensible trough, and
ranged that a relatively small pump operated by
means for moving said extensible trough relative
reciprocable movement of the conveyer, may be
to said reciprocating trough including two fric
provided to supply pressure for the ?uid system.
tion grip blocks connected with one of said troughs
It may also be seen that the use of a small
and disposed on each side of the other of said
pump and accumulator is made possible by sup
troughs for engagement therewith during alter
plementing the pressures supplied by the pump
nate strokes of the conveyer, and ?uid operated
by auxiliary booster cylinders operated by the
means for moving said blocks to a gripping posi
reaction of the extensible trough against the
tion during alternate strokes of the conveyer in
ground, and that these booster cylinders besides 30 cluding a ?uid cylinder on each side of said
boosting the pressure provided by the pump also
trough, said cylinders each having a piston oper
serve to release the grip blocks when the shovel
atively connected with one of said gri'p blocks,
engages a solid obstruction during the forward
a pump for supplying ?uid under pressure to said
strokes of the conveyer.
>
cylinders, a valve connected between said pump
It may further be seen that with the feeder
and said cylinders for‘ controlling the supply of
head just described the gripping pressure of the
?uid under pressure thereto, and means oper
grip blocks is always equal, which prevents bind
ated by reciprocable movement of the conveyer
ing of said trough, and that the control levers
for operating said valve to supply fluid to said
for operating the feeding mechanism are non
cylinders during alternate strokes of the con
reciprocating, so they may readily be operated,
veyer, to move said grip blocks to a gripping posi
to cause extension or retraction of the extensible
tion.
trough.
It may still further be seen that the valve for
4. In a feeding device for shaker conveyers, a
reciprocating trough, an extensible trough, and
supplying ?uid under pressure to engage the grip
means operated by reciprocable movement of the
blocks with their bearing plates during alternate 45 conveyer for moving said extensible trough rela
strokes of the conveyer, is operated by reciproca
tive to said reciprocating trough including two
ble movement of the conveyer and requires no
carrier members, said carrier members being
manual effort to operate it aside from turning
connected with one of said troughs on opposite
the control handle II? to the desired operative
sides thereof and having two friction grip blocks
position.
50 carried thereby and adapted to engage the other
While I have herein shown and described one
of said troughs during alternate strokes of the
form in which my invention may be embodied,
conveyer, a separate ?uid cylinder mounted in
it will be understood that the construction there
each carrier member and having a piston opera
of and the arrangement of ‘the various parts may
tively connected with one of said grip blocks car
be altered without departing from the spirit and 55 ried by each carrier member, a pump for supply
scope thereof. Furthermore, I do not wish to
ing ?uid under pressure to said cylinders, a valve
be construed as limiting my invention to the
connected between said pump and opposite ends
of said cylinders and operable to supply ?uid
under pressure to opposite ends of said cylinders,
I claim as my invention:
60 and valve operating means operated by recipro
1. In a feeding device for shaker conveyors,
cable movement of the conveyer for moving said
a reciprocating trough, an extensible trough, and
valve to- positions to alternately supply ?uid under
means for moving said extensible trough relative
pressure to the head and piston rod ends of said
to said reciprocating trough including two fric
cylinders during alternate strokes of the con
‘
tion grip blocks reciprocably moved by one of 65 veyer. '
said troughs and disposed on each side of the
5 In a feeding device for shaker conveyers, a
other of said troughs for engagement therewith
reciprocating trough, an extensible trough, and
during alternate strokes of the conveyer, ?uid
means for moving said extensible trough relative
operated means for moving said grip blocks to a
to said reciprocating trough by reciprocable move
gripping position, and valve means operated by 70 ment of the conveyer including a carrier member
reciprocable movement of the conveyer for sup
connected with one of said troughs and having
plying ?uid under pressure to said ?uid oper
two" friction grip- blocks carried thereby and
ated means during alternate strokes of the con
adapted to‘ engage the other of said troughs dur
veyer.
ing alternate strokes of the conveyer, a ?uid cyl
2. In a feeding device for shaker conveyers, a. 75 inder having a‘ piston operatively connected with
speci?c embodiment illustrated, excepting as it
may be limited in the appended claims.
{2,404,058
I1
12
one of said grip blocks, a pump for supplying ?uid
under pressure to said cylinder, a valve connected
between said pump and opposite ends of said
cylinder and operable to supply ?uid under pres
sure to opposite sides of said cylinder, valve oper
said grip block with said extensible trough, a
pump for supplying fluid under pressure to said
cylinder, a valve connected between said pump
and cylinder for admitting ?uid under pressure
to one end of said cylinder during certain strokes
f the conveyer and to the other end of said cyl
inder during the opposite strokes of the conveyer,
ating means operated by reciprocable movement
of the conveyer for moving said valve to positions
to alternately supply fluid under pressure to the
head and piston rod ends of said cylinder during
alternate strokes of the conveyer, and manual
control means for said valve operating means
for moving said valve operating means to a posi
tion to cause said valve to admit ?uid to the head
and valve operating means on said frame for oper
ating said valve during each, forward and return
stroke of the conveyer due to reciprocable move
ment of said valve with respect to said valve oper
ating means,
'
8. In a feeding device‘for shaker conveyers, a
reciprocating trough, an extensible trough, a
of the conveyer and to the opposite end of said 15 frame extending along said reciprocating trough
and adapted to move said reciprocating and ex
cylinder during the return strokes of the conveyer,
tensible troughs laterally, said frame being non
to cause movement of said extensible trough in
reciprocable during reciprocable movement of said
one direction, and to a position to cause said valve
troughs, a carrier member connected with said
to admit ?uid to the head end of said cylinder
during the return strokes of the conveyer and to 20 reciprocating trough, two friction grip blocks
mounted in said carrier member and adapted to
the opposite end of said cylinder during the
grip said extensible trough above and below a
forward strokes of the conveyer, to cause move
portion thereof during certain strokes of the con
ment of said extensible trough in an opposite
veyer, a cylinder having a piston therein having
direction.
operative connection with one of said grip blocks,
6. In a feeding device for shaker conveyers, a
for engaging said grip block with said extensible
reciprocating trough, an extensible trough, a
trough, a pump for supplying ?uid under pres~
frame extending along said reciprocating trough
sure to said cylinder, a valve connected between
and adapted to move said troughs laterally, said
said pump and cylinder for admitting fluid under
frame being non-reciprocable during reciprocable
pressure to one end of said cylinder during cer
movement of said troughs, a carrier member con
tain strokes of the conveyer and to the other
nected with one of said troughs and having two
end of said cylinder during the opposite strokes
friction grip blocks mounted therein and adapted
of the conveyer, valve operating means on said
to engage another of said troughs, and means for
frame for operating said valve during each for
moving said grip blocks to a gripping position dur ing alternate strokes of the conveyer, to cause 35 ward and return stroke of the conveyer due to
reciprocable movement of said valve with respect
relative movement of said extensible trough with
respect to said reciprocating trough including a
to said valve operating, means, and a control han
dle on said frame manually operable to move said
?uid pump, a fluid cylinder and piston having
valve operating means into position to operate
operative connection with said grip blocks, a ?uid
valve reciprocably movable with said reciprocating 40 said valve to supply ?uid under pressure to one
end of said cylinder to engage said grip blocks
trough and connected between said pump and cyl
with said extensible trough, during the forward
inder to control the admission of ?uid under pres
strokes of the conveyer, to cause extensible move
sure to said cylinder and piston, to move said grip
ment of said extensible trough, and to move said
blocks to a gripping position during alternate
strokes of the conveyer, valve operating means on 45 valve operating means into position to operate
said valve to supply ?uid under pressure to the
said frame for operating said valve during each
same end of said cylinder during the return
stroke of the conveyer due to reciprocable move
strokes of the conveyer, to cause retractible move
ment of said valve with respect to said valve oper
ment of said extensible trough.
ating means, and a control handle for said valve
9. In a feeding device for shaker conveyers, a
operating means for positioning said valve oper 50
reciprocating trough, an extensible trough, a
ating means to operate said valve to supply fluid
frame extending along said reciprocating trough
to said cylinder and piston to move said grip,
and adapted to move said troughs laterally, said
blocks to an engaged position during the forward
frame being non-reciprocable during reciprocable
strokes of the conveyer and to a released position
movement of said troughs, a carrier member piv
during the return strokes‘of the conveyer, to cause
end of said cylinder during the forward strokes
extensible movement of saidextensible trough,
and for positioning said valve operating means
into another position to operate said valve to
supply, ?uid to said cylinder and piston to move
said grip blocks to an engaged position during 60
the return strokes of the conveyer, and to a re
leased position during its forward strokes to cause
retractible movement of said extensible trough.
7. In a feeding device for shaker conveyers, a
reciprocating trough, an extensible trough, a ,
frame extending along said reciprocating trough
and adapted to move said troughs laterally, said
frame being non-reciprocable during reciprocable
movement of said troughs, a, carrier member piv
otally connected with said reciprocating trough,
two friction grip blocks mounted on said carrier
member and adapted to grip said extensible trough
above and below a portion thereof during certain
strokes of the conveyer, a cylinder having a pis
ton therein having operative connection with one
of said grip blocks, for engaging said grip block
with said extensible trough, a pump for supplying
?uid under pressure to said cylinder, an operative
connection between said pump and said frame
to operate said pump by relative movement be
tween said reciprocating trough and said frame,
a valve reciprocably movable with said reciprocat
ing trough and connected between said pump and
otally connected with said reciprocating trough, 70
said cylinder, and means operated by relative
movement between said reciprocating trough and
member adapted to grip said extensible trough
two friction grip blocks mounted on said carrier
during certain strokes of the conveyer, a cylinder
having a piston therein having operative connec
tion with one of said grip blocks, for engaging
frame for operating said valve to admit ?uid under
pressure to one end of said cylinder during cer
tain strokes of the conveyer and to the opposite,
2,404,058
13
7
14
end of said cylinder during certain other strokes
thereof during certain strokes of the conveyer,
of the conveyer.
10. In a feeding device for shaker conveyers, a
reciprocating trough, an extensible trough, a
a cylinder having a piston therein having oper
ative connection with one of said grip blocks, for
frame extending along said reciprocating trough
and adapted to move said troughs laterally, said
frame being non-reciprocable during reciprocable
movement of said troughs, a carrier member piv
otally connected with said reciprocating trough,
engaging» said grip block with said extensible
trough, a pump for supplying ?uid under pres
sure to said cylinder, an operative connection
between said pump and said frame to operate
said pump by relative movement between said
reciprocating trough and said frame, a valve
two friction grip blocks mounted on said carrier 10' reciprocably movable with said reciprocating
member and adapted to grip said extensible trough
above and below a portion thereof during certain
strokes of the conveyer, a cylinder having a piston
therein having operative connection with one of
saidgrip blocks, for engaging said grip block with 15
said extensible trough, a pump for supplying?uid
under pressure to said cylinder, an operative con
nection between said pump and said frame to
trough and connected between said pump and
said cylinder, and means operated by relative
movement between said reciprocating trough
and frame for operating said valve to admit
?uid under pressure to one end of said cylinders
during the forward strokes of the conveyer to
engage said grip blocks with, said extensible
trough and to the opposite end of said cylinder
operate said pump by relative movement between
during the return strokes of the conveyer to dis
said reciprocating trough and said frame, a valve 20 engage said grip blocks from said extensible
reciprocably movable with said reciprocating
trough, to cause extensible movement of said
trough and connected between said pump and said
extensible trough, and for operating said valve
cylinder, and means operated by relative move
to admit ?uid under pressure to said one end
ment between said reciprocating trough and
of said cylinder to engage said grip blocks with
frame for operating said valve to admit ?uid under 25 said extensible trough during the return strokes
pressure to one end of said cylinder during cer
of the conveyer and to said opposite and of said
cylinder to disengage said grip blocks from said
tain strokes of the conveyer and to the opposite
end of said cylinder during certain other strokes
' extensible trough during the forward strokes of
of the conveyer, including a control handle on
the conveyer, to cause retractible movement of
said frame and an operative connection between 30 said extensible trough, including two oppositely
acting lever arms having connection with said
said control handle and said valve.
valve, a control handle on said frame and an
11. In a feeding device for shaker ‘conveyers,
operative connection between said control han
a reciprocating trough, an extensible trough, a
dle and said lever arms to cause oscillation of
frame extending along said reciprocating trough
and adapted to move said troughs laterally, said 35 one of said lever arms due to reciprocable move
ment of the conveyer upon turning of said con
frame being non-reciprocable during reciprocable
trol handle to one operative position and to cause
movement of said troughs, a carrier member
oscillation of the other of said lever arms due
pivotally connected with said reciprocating
to reciprocable movement of the conveyer upon
trough, two friction grip blocks mounted on said
carrier member ‘and adapted to grip said ex 40 the-turning of said control handle to another
operative position.
tensible trough above and below a portion there
13. In a feeding device for shaker conveyers,
of during certain strokes of the conveyer, a cylin
a reciprocating trough, an extensible trough,
der having a piston therein having operative
and means operated by reciprocable movement
connection with one of said grip blocks,‘for en‘
gaging said grip block with said extensible 45 of the conveyer, for moving said extensible
trough relative to said reciprocating trough in
trough, a pump for supplying ?uid under pres
cluding a carrier member, two friction grip
sure to said cylinder, an operative connection
blocks carried by said carrier member, a ?uid
between said pump and said frame to operate
pressure cylinder and piston mounted on said
said pump by relative movement between said
carrier member for engaging said grip blocks
reciprocating trough and said frame, a valve
with one of said troughs during certain strokes
reciprocably movable with said reciprocating
of the conveyer, and an operative connection
trough and connected between said pump and
between said carrier member and said other
said cylinder, and means operated by relative
movement between said reciprocating trough and
frame for operating said valve to admit ?uid un
der pressure to one end of said cylinder during
certain strokes of the conveyer and to the oppo
site end of said cylinder during certain other
trough operated by frictional resistance between
said extensible trough and the ground to supply
?uid under pressure to said cylinder and piston, ‘
to move said grip blocks to a gripping position
including a longitudinally extending ?uid pres
turning of said control handle to an operative
position.
sure cylinder and piston pivotally connected
between said carrier member and said other
trough operated by frictional resistance between
up therein due to the thrusts imparted thereto
by the reaction of said extensible trough against
the ground, a, ?uid connection from said longi
tudinally extending cylinder to said ?rst men
12. In a feeding device for shaker conveyers,
a reciprocating trough, an extensible trough, a
tween said longitudinally extending cylinder and
strokes of the conveyer, including a lever arm
having operative connection with said valve, a
control handle on said frame, and an operative
connection between said control handle and lever
arm to cause oscillation of said lever arm upon
tioned cylinder, and valve means connected be
frame extending along said reciprocating trough
said ?uid connection for holding pressure in
and adapted to move said troughs laterally, said
said longitudinally extending cylinder until it
frame being non-reciprocable during reciprocable
reaches a predetermined value, and then per
mitting ?uid under pressure to pass through
said ?uid connection to said ?rst mentioned
movement of said troughs, a carrier member
pivotally
connected 'with
said reciprocating
trough, two friction grip blocks mounted on
cylinder.
said carrier member and adapted "to grip ‘said
‘extensible trough above and below a portion
14'. In a feeding device for shaker conveyers,
‘a reciprocating trough, “an extensible trough,
2,404,058
115
longitudinally extending cylinder to permit ?uid
and means operated by reciprocable movement
of the conveyer for moving said extensible
pressure to be built up therein by movement 0 we
trough relative to said reciprocating troughin
eluding a carrier member,v two friction grip
said associated piston along said longitudinally
extending cylinder effected by the thrust im
parted to said piston through said extensible
blocks carried by said carrier.‘ member, a ?uid
pressure cylinder and piston mounted on said
carrier member for engaging said grip blocks
with one of said troughs during certain strokes
of the conveyer, and an operative connection
between said carrier member and said other
.19
trough operated by frictional resistance between
said extensible trough and the ground to supply
?uid under pressure to said cylinder and piston
other Valve means in said longitudinally ex
tending cylinder for releasing ?uid pressure from
both of said cylinders, to release said grip blocks
in a direction to move said grip blocks to a grip
ping position including a longitudinally extend
ing fluid pressure cylinder and piston pivotally
is
connected between said carrier member and said
other trough and adapted to have ?uid pressure
built up therein due to the thrust imparted
mentioned cylinder, and valve means connected
between said longitudinally extending cylinder
said cylinders, to release said grip blocks when
7
1'7. In a feeding device for shaker conveyers,
a reciprocating trough, an extensible trough
mounted for extensible or retractible movement
longitudinally extending cylinder to said ?rst
it reaches a [predetermined value, and then per
mitting ?uid under pressure to pass through
said fluid connection to said ?rst mentioned
cylinder, and other valve means in said last men
tioned cylinder for releasing ?uid pressure from
when said extensible trough engages a solid ob
struction upon the forward strokes of the con
veyer.
thereto by the reaction of said extensible trough _
against the ground, a fluid connection from said
and said ?uid connection for holding pressure
in said longitudinally extending cylinder until
trough by frictional resistance between said ex
tensible trough and the ground, and ?uid con
nections between said longitudinally extending
cylinder and said ?rst mentioned cylinder for
supplying ?uid under pressure to said ?rst 1nen~
tio-ned cylinder upon release of said valve, and
2,5
so
with respect to said reciprocating trough, a car
rier member reciprocably driven by said recipro
cal-ting trough, two friction grip blocks on said
carrier member adapted to grip said extensible
trough during alternate strokes of the conveyer,
and a booster cylinder and piston connecting said
carrier member with said reciprocating trough
for reciprocably moving said carrier member with
said reciprocating trough, said booster cylinder
having ?uid therein and being operable to boost
the gripping action of said grip blocks due to
the thrust imparted to said piston by said ex
tensible trough by the reaction of said extensible
said extensible trough engages a solid obstruc
trough on the ground, and valve means adapted
tion, upon the forward strokes of the conveyer.
15. In a feeding device for shaker conveyors, 35 to release the pressure in said booster cylinder
to the return to permit slippage of said grip
a reciprocatingtrough, an extensible trough, and
blocks along said extensible trough when said
means operated by recipro-cable movement of the
extensible trough engages a solid obstruction on
conveyer for moving said extensible trough rela
the ground.
tive to said reciprocating trough including a car
18. In a feeding device for shaker conveyers,
rier member, two friction grip blocks carried by 40
a reciprocating trough, an extensible trough
said carrier member, a ?uid pressure cylinder and
mounted for extensible or retractible movement
piston mounted on said carrier member for en
with respect to said reciprocating trough, a car
gaging said grip blocks with said extensible
rier member reciprocably driven by said recipro
trough during alternate strokes of the conveyer,
a longitudinally extending ?uid pressure cylin 45 cating trough, two friction grip blocks on said
carrier member adapted to grip said extensible
der having a piston therein connecting said car
trough during alternate strokes of the conveyer,
rier member with said reciprocating trough, to
and a booster cylinder and piston connecting said
cause said carrier member to reciprocably move
carrier member with said reciprocating trough ‘
with said reciprocating trough, a valve in said
longitudinally extending cylinder to permit ?uid 5.0 for reciprocably moving said carrier member with
said reciprocating trough, said booster cylinder
pressure to be built up therein by movement of
being operable to boost the gripping action of
said associated piston along said longitudinally
said grip blocks due to the thrust imparted to
extending cylinder effected by the thrust im
said piston by said extensible trough by the re
parted to said piston through said extensible
trough by frictional resistance between said ex ,55 action of said extensible trough on the ground.
19; In a feeding device for shaker conveyers,
tensible trough and the ground, and ?uid con
a reciprocating trough, an extensible trough
nections between said longitudinally extending
mounted for extensible or retractible movement
cylinder and said ?rst mentioned cylinder for
with respect to said reciprocating trough, a car
supplying ?uidunder pressure to said first men
rier member reciprocably driven by said recipro
tioned cylinder upon release of said valve.
cating trough, two friction grip blocks on said
16. In a feeding device for shaker conveyers,
carrier member adapted to grip said extensible
a reciprocating trough, an extensible trough, and
trough during alternate strokes of the conveyer,
means operated by reciprocable movement of the
a ?uid cylinder mounted on said carrier mem
conveyer for moving said extensible trough rela
tive to said reciprocating trough including a car 65 ber having a piston movable therein, an opera
tive connection between said piston and one of
riermember, two friction grip blocks carried by
said grip blocks, a pump for supplying ?uid un
said carrier member, a ?uid pressure cylinder and
der pressure to said cylinder, a valve connected
piston mounted on said carrier member for en
between said pump and cylinder for admitting
gaging said grip blocks with ‘said extensible
trough during alternate strokes of the conveyer, 70 ?uid under pressure to said cylinder to engage
said grip blocks with said extensible trough dur
a longitudinally extending ?uid pressure cylin
ing alternate strokes of the conveyer, and means
der having a piston therein, connecting said car
rier member with said reciprocating trough, to
connecting said carrier member with said re
cause said carrier member to reciprocably move
ciprocating trough for reciprocably moving said
with said reciprocating trough, a‘ valve/in said
carrier member-With said reciprocating trough.
2,404;058
17
said means being operated by the thrust impart
18
mounted for extensible or retractible movement
with respect to said reciprocating trough, a car
ed to said carrier member by the reaction of said
extensible trough on the ground, to boost the
rier member reciprocably driven by said recipro
gripping action of said grip blocks, and also be
cating trough, two friction grip blocks on said
ing operable to release ?uid from said cylinder, UK carrier member adapted to grip said extensible
to release said grip blocks when said extensible
trough during alternate strokes of the conveyer,
trough engages an obstruction on the ground.
20. In a feeding device for shaker conveyers, a
reciprocating
trough,
an
extensible
trough
a ?uid cylinder mounted on said carrier member
having a piston movable therein, an operative
connection between said piston .and one of said
mounted for extensible or retractible movement 10 grip blocks for moving said grip blocks into a
with respect to said reciprocating trough, a car
gripping position, a pump for supplying ?uid un
rier member reciprocably driven by said recipro
der pressure to said cylinder, a valve connected
cating trough, two friction grip blocks on said
between said pump and cylinder for admitting
carrier member adapted to grip said extensible
?uid under pressure to said cylinder to engage
trough during alternate strokes of the conveyer, 15 said grip blocks with said extensible trough dur
a ?uid cylinder mounted on said carrier mem
ing alternate strokes of the conveyer, and a
her having a piston movable therein, an operative
booster cylinder and piston connecting said car
connection between said piston and one of said
rier member with said reciprocating trough for
grip blocks, a pump for supplying ?uid under
reciprocably moving said carrier member with
pressure to said cylinder, a valve connected be
said reciprocating trough, a ?uid connection from
tween said pump and cylinder for admitting ?uid
said booster cylinder to said first mentioned cyl— ’
under pressure to said cylinder to engage said
inder to supply ?uid pressure built up in said
grip blocks with said extensible trough during
booster cylinder by the thrust imparted to said
alternate strokes of the conveyer, and a booster
piston in said booster cylinder caused by the
cylinder and piston connecting said carrier mem~
reaction of said extensible trough against the
her with said reciprocating trough for recipro
ground, a valve for holding ?uid under pressure
cably moving said carrier member with said re
in said booster cylinder until it reaches a prede
ciprocating trough, said booster cylinder and
termined value, and then releasing ?uid under
piston having ?uid connections with said ?rst
pressure through said ?uid connection to said
mentioned cylinder and being operated by the 30 ?rst mentioned cylinder, to supply ?uid under
thrust imparted to said carrier member by the
pressure to said first mentioned cylinder in ex
reaction of said extensible trough on the ground,
cess of that supplied by said pump, to boost the
to supply ?uid pressure to said ?rst mentioned
gripping action of said grip blocks.
cylinder in excess of that supplied by said pump,
23. In a feeding device for shaker conveyers, a
to boost the gripping action of said grip blocks.
35 reciprocating trough, an extensible trough
21. In a feeding device for shaker conveyers, a
mounted for extensible or retractible movement
reciprocating trough, an extensible trough
with respect to said reciprocating trough, a car
rier member reciprocably driven by said recipro
cating trough, two friction grip blocks on said
rier member reciprocably driven by said recipro 40 carrier member adapted to grip said extensible
cating trough, two friction grip blocks on said
trough during alternate strokes of the conveyer,
carrier member adapted to grip said extensible
a ?uid cylinder mounted on said carrier member
trough during alternate strokes of the conveyer,
having a piston movable therein, an operative
mounted for extensible or retractible movement
with respect to said reciprocating trough, a car
a ?uid cylinder mounted on said carrier member
connection between said piston and one of said
having a piston movable therein, an operative
grip blocks for moving said grip blocks into a
connection between said piston and one of said
gripping position, a pump for supplying ?uid
grip blocks for moving said grip blocks into a
under pressure to said cylinder, a valve connected
gripping position, a pump for supplying ?uid un
between said pump and cylinder for admitting
der pressure to said cylinder, a valve connected
?uid under pressure to said cylinder to engage
between said pump and cylinder for admitting 50 said grip blocks with said extensible trough dur
?uid-under pressure to said cylinder to engage
ing alternate strokes of the conveyer, a booster
said grip blocks with said extensible trough dur
cylinder and piston connecting said carrier mem
ing alternate strokes of the conveyer, and a
her with said reciprocating trough for recipro
booster cylinder and piston connecting said car
cably moving said carrier member with said re
rier member with said reciprocating trough for 55 ciprocating trough, a ?uid connection from said
reciprocably moving said carrier member with
said reciprocating trough, a ?uid connection from
said booster cylinder and piston to said ?rst men
tioned cylinder, operable to supply ?uid pressure
to said ?rst mentioned cylinder which is built up 60
booster cylinder to said ?rst mentioned cylinder
to supply ?uid pressure built up in said booster
cylinder by the thrust imparted to said piston
in saidbooster cylinder caused by the reaction of
said extensible trough against the ground, a valve
in said booster cylinder by the thrust imparted
for holding ?uid under pressure in said booster
to said piston therein due to the reaction of said
cylinder until it reaches a predetermined value,
extensible trough on the ground, and which built
and then releasing ?uid under pressure through
up pressure is in excess of that supplied by said
said ?uid connection to said ?rst mentioned cylin
pump, to boost the gripping action of said grip 65 der to supply ?uid under pressure to said ?rst
blocks, and valve means adapted to release the
mentioned cylinder, in excess of that supplied by
pressure in said booster cylinder to the return
said pump, to boost the gripping action of said
and to release pressure from said ?rst mentioned
grip blocks, and other valve means for releasing
cylinder and piston, to permit ‘slippage of said
?uid from said booster cylinder and said ?rst
grip blocks along said extensible trough when 70 mentioned cylinder to the return, to release said
said extensible trough engages a solid obstruc
grip blocks from said extensible trough when the
tion on the ground.
forward end of said extensible trough engages a
22. In a feeding device for shaker conveyers, a
solid obstruction on the ground.
reciprocating trough, an extensible trough
»
'
LOY D. HAGENBOOK,
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