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Патент USA US2380651

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July 31» “1945
H. T. JEFFERY`
2,380,651 '
l PNEUMATIC EJEcToR
Filed Feb. -11, 194s
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July 31, 1945'
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H. T. JEFFERY i
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2,380,651
PNEUMATIC EJEGTOR
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Filed Feb. 1l, 1945
3 Sheets-Sheet 3
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2,380,651
Patented July 31, 1945
UNITED ‘STATE S
PATENT OFFICE
2,380,651
,PNEUMATIC EJECTOR
Harold T. Jeffery, Wilmette, Ill., assigner to
Yeomans, Brothers Company, a corporation of
Delaware
vApplication February 11, 1943, Serial No. 475,577
2 claims.
(ci. 3oz-53)
The present invention relates to pneumatic
ejectors and is particularly concerned with
pneumatic ejectors capable of use in the dis
position of packing housewaste and like mate
-
rials.
'
features of the three-way valve which .con
stitutes a part of the apparatus of Fig, 1;
Fig. 5 is a complete wiring diagram of one
embodiment of the ejector control system used
of the present invention; and
. Fig. '6 is a schematic diagram of the control
4
The satisfactory handling ofpacking house
system.
waste and similar materials has long presented
a serious problem to the conveying art. Be
cause of sanitary considerations and because
'
»
Referring .to Fig. 1, the ejector unit of the
embodiment ofthe invention there illustrated
comprises a main frame 1 which may conven->
10
these materials> often include large pieces, suchV
iently be fabricated of welded structural ele
as parts of the viscera, of animals which may be
very tough or veryy sticky, or both, it is not
practical to elevate or to move wastes of this
type forv any» considerable distances by belt or
> ments, and a cylindrical tank or‘receiver 9 for
other continuous conveying means. Pneumatic
ejectors have been proposed for‘ handling wastes
of this type, but in general, they have proven
unsatisfactory and unreliable 'in operation. For
bottom 'section Il which is directly connected
by an elbow I3 to a discharge pipe I5 which may
be of any length. The upper end of the receiver
receiving and containing the waste _or other
material being >handled by the apparatus. yThe
receiver il is provided. with a conically shaped
.
9 is closed byV a suitable cover I1 having a
example, a source of serious trouble in the prior 20 iianged, inlet pipe connection I9 in the central
devices has been the valves employed in the
portion thereof. The various parts ~of the re- `
discharge side of the ejector apparatus. These
ceiver 9 may be made of welded plate, or of cast
valves became fouled and inoperative in very
or of other -suitable material. The
` -dis- l
short periods of time requiring- such frequent
charge end of the receiver 9 is normally open>
cleaning that use of the ejector becomes un 25 at all times and is connected directly to the
economic. Other difficulties haveV been equally
discharge pipe I5 without the use of any valves
or equivalent structure. A manhole 20 is pro
troublesome.
The present invention, as will hereinafter ap
vided tovpermit accessl to theinterior of the re
pear, overcomes the disadvantages of the prior
art structures and makes possible the elimina 30 A combination hopper and inlet valve struc
tion of certain of the trouble producing valves
ture is bolted or otherwise attached tothe re
ceiver inlet pipe I9. This structure includes a
v and other apparatus which have heretofore "
ceiver.
in a cylindrically shaped inner section 23 adapt
larly adapted for use in connection with this
ejector unit. ’I'he details of >the apparatus and
In the drawings:
1
.
valve 2B.
and a suitably shaped valve body 21 which may
conveniently include flanges 29 for facilitating
its connection to the flange il at the upperend
ofthe receiver inlet pipe I9 and the ñange 3l at
the lower end of the hopper 2l. 'I'he iiapper
vvalve 25 is hingedly supported within the valve
satisfactory. The invention includes a novel
ejector unit and a novel control system particu
one preferred >embediment thereof.
v
. ed to be closed by a circular iiapper
' ation pneumatic ejectors and systems in ac
cordance with the invention have proven highly -
ing drawings andthe following description of
l
conically shapedhopper 2i, which terminates
been considered ,essential parts of pneumatic
ejector systems. In actual experimental oper
the various advantages of the invention will be
made apparentv by reference to the accompany
.
. >body'21formovement‘from a normal open
tion. as illustrated in Fig. 1, to a closed position v
in which position it seats against the lower
45
Fig. 1 is a side elevational view. partially in
section, illustrating the features of an ejector
unit constructed in accordance with the present
invention vand certain associated apparatus;
Wg. 2 is an enlarged, fragmentary view illus
trating certain of the details of the control
-electrode and mounting which constitutes a
part of the apparatus of Fig. 1;
Figs. 3 and 4 are enlarged sectional views I
illustrating diagrammatically certain of- the 55
surface oi' the cylindrical hopper section 22.
. In the structure illustrated, the fiapper valve
25 is actuated by an-air driven piston 35 which
moves in a suitable cylinder 21 supported on
the upper .end of the receiv . The piston 35 is
operatively connected -to lthe flapper valve 25
by vsuitable linkages 39 and Il. When in its
vertical or open position, as illustrated 'in Fig.
1, the dapper valve 2l is outof the way of the
material which is dischargedl into the receiver
9 through the'hopper 2l. This prevents mate
¿ad
assenti
which might impair `the operation of the
valve from collecting on the valve face.
‘Ti‘i'ie discharge end of a belt conveyor arranged
discharge into the hopper 2| is illustrated at
s3 in Fig. 1. It will be understood that the
means whereby the material to be handled by
the ejector is delivered to the ejector receiver 9
is not an important part of the invention. The
invention contemplates, however, that the de
livery means can be placed under the control
of the ejector control system, so ß to provide
for interrupting the delivery of the waste ma
switch tI to the hand position, or in response
to the operation of a relay controlled by the
electrode #i5 when the main control switch 8|
`is in the automatic position, a series of oper
ations will take place in predetermined time
sequence.
The ñrst operation in this sequence
effects the stopping of the conveyor d3. Next,
the ilapper valve 25 is operated to close the
inlet opening in the top of the receiver 9. Next,
pressure air is admitted to the receiver il for
a predetermined period'of time.
This air ef
fects the ejection of the material in the receiver.
material to the ejector apparatus during the
As soon as the election operation is completed,
actual ejection operation.
v
the fiapper valve 25 is reopened, and the con
A control electrode, 45 is supported on the 15 veyor 43, or other delivery means is again put
head of the receiver so as to extend downwardly
in operation, the pressure air having been pre
into the receiver 9 as illustrated in Fig. 1. The
viously shut oiT. The complete apparatus is
support means for the electrode 45, as illustrated
then restored to its original condition, and it
in Fig. 2, includes an insulator 41 and a metallic,
is ready for the next cycle.
cup shaped, insulator guard or shield 49 which is 20
The control means utilized for accomplishing
disposed about the upper end of the electrode
this operation sequence includes a single pole,
45 and the lower end of the electrode insulator
single throw induction relay, the operation of
41 and which opens into the interior of the re
which is controlled automatically or manually
-ceiver 9, as illustrated particularly in Fig. 2.
in accordance with the position of the main
The electrode 45 and the insulator 41 are me 25 control switch 8|, a motor driven timing «mech
chanicaly connected to the electrode guard by
means of a union 5| or like means to permit
convenient removal of the electrode from the
receiver for inspection or replacement. The
anism which includes eight, single pole, single
throw switches labeled Ti to Ts inclusive, a single
pole, single throw, time interval relay, three
double pole. single throw electro-magnetic re
union 5| provides a gas tight seal. A conduit 30
lays RI, R2, and R3, one single pole, single
box 53 having a removable, gasket sealed cover
throw electro-magnetic relay R4, a normally
55 of conventional type is provided at the upper
open single pole, single throw pressure switch,
end of the electrode assembly for protecting the
electrical connections.
s
s
An .air inlet pipe 55 of substantial diameter
is connected at one end to the valve body 21.
The other end of the air inlet pipe 55 is con
nected to a source of pressure air through an
elbow 51, pipe lengths 58, 59, and 60, a T con
nection Si, and a normally closed electrically
operated valve 63. Air pressure is supplied to
the operating piston 35 for the iiapper valve 25
through a three-Way, power operated valve 65,
elbow ñttings 61, and suitable pipe sections 09,
l0, 1|, 12, and 13. The initial pipe section 69 45
and a line starter or other electrically operated
control means for the conveyor.
Referring particularly to the wiring diagram
of Fig. 5 and the schematic diagram of Fig. 6,
the electrode is connected to the A or automatic
terminal of the main control switch 8| by the
conductor 83. The central terminal of the
switch 3| is connected to one side of the oper
ating coil 85 for the induction relay by the
conductor B1. The other side of the operating
coil 85 for the induction relay is connected to
the H terminal of the main control switch 8|
-by the conductor 89. One terminal of the
connects with the T connection 5| in the main
normally energized coil 9| of the induction relay
supply line.
'
.
is
connected to the L| side of the power supply
The three way valve 65 is normally in the
for the control circuit through the conductors
position illustrated in Fig. 3. In this position
the connection to the source of pressure air pro 50 93 and 95. The other side of the normally
energized coil 9| of the induction relay is con
vided by the pipes 69 and 10 is shut ofi’ and the
nected
to the L2 side of the line by the con'
piston chamber 31 is vented to the atmosphere
ductor 91. The induction relay is of the single
through the pipe sections 13 and 12, elbows 61
pole, single throw type and is normally in the
and the vent pipe sections 15 and '56.
open circuit position.
The valve 65 may be of any standard type. 55
The induction relay contacts IRC are con
The particular device illustrated in the draw
nected in parallel across the contacts R|A of
ings is an electrically operated valve, and in
the A pole of the two pole, single throw, elec
cludes a T-shaped body 11 within which the
tro-magnetic
relay R! by conductors 99 and |0|.
valve element 19 is adapted to be moved from
the normal position of Fig. 3 to the position il 60 One side of the paralleled contacts IRC of the
induction relay and the contacts RIA of the
lustrated in Fig. 4 upon the energization of a
A
pole of the electrmmagnetic relay RI is con»
suitable solenoid indicated at |8|. When in the
nected to one side of the single pole, single
_position of Fig. 4, the vent pipe 15 is closed, and
throw, normally closed, time interval relay by
pressure air is permitted to flow from the sup
the conductor- |03, and thence through the conply line 10 into the pipe section 1| which is con
tacts of the time interval relay to the line L2
nected to the upper end of the piston chamber
by the conductor |05. The other side of the par
31 for the dapper valve operating piston 35, as
alleled contacts IRC and RIA is connected to
previously described.
'
one
side of the operating coil |01 for the time
The features of a preferred control system are
illustrated in Figs. 5 and 6. This system is ar 70 interval relay by the conductor |09, and to one
side of the operating coil ||| for the relay Rl
ranged for either automatic or manual oper
by the conductor H3. The other side of the
ation. and it includes a single pole, .double throw
operating coil |01 for the time interval relay
automatic-oiï-hand switch 8| as the main con
is connected to the line L| through the con
trol element. The control system is so arranged
ductor
the other side of the operating
that in response to the movement oi the main 75 coil i||95,forand
the relay Ri is connected to the
3
2,380,651
One side of the operating motor TM for the
line starter. Power is supplied to the electro
magnetic operating coil |19 of the line starter
timer is connected to the line LI through the
conductors II1 and 95. The other side of the
includes the conductor |8I and the push button
timer motor is connected to the L2 side of the line
through the contacts RIB of the B pole of the
switchPBI.
The L2 Connection for the operating coil |19
relay RI, the connectors IIS, |2I, |23 and |05
for the line starter includes the push button
switch PB2 (if used) the conductor |83, the relay
line L2 through the conductors II5, I|1 and 95.
providing the electrical connections. The con
tacts RIB of the B pole of the relay RI are
paralleled by the ñrst set of contacts TI of the
timer; the circuit being provided by the conductor
I2| vand the conductor |25 which connects to the
L2 side of the line. A pilot light |21 is connected
in parallel across the timer motor TM to indicate
when that motor is in operation. The circuit to
.the pilot lamp is provided by the conductors |29,
I 3| and I I 9.
-
The L2 side of the timer motor TM is also con«
nected to one side of the operating coil |33 for
the single pole,
electro-magnetic relay
R4
through the normally open contacts T1 of'the
timer switch and the conductors |35, |31 and
H9. The other side of the operating coil |33 of
from the lines LI and L2.
The circuit from LI
contacts R4A, the conductors |35 and |81, thence
through the normally open timer switch T8 and
the conductors |89 and I9I to the L2 side of the
line. The timer switch T2 is paralleled across
the contacts RIIA of the relay R4 by means of the
conductors |85 and |93. The contacts of the
auxiliary line starter switch LSA are paralleled
across the contacts of the timer switch T8 by the
conductor |89, and the conductors |95, |85, and
|81.
The LI side of the operating coil |33 for the
relay R4 is connected to the LI side of the line by
the conductors |39, I4I, I I1 and 95. The L2 side
of the operating coil |33 is connected to the L2
side of the line through the normally open timer
switch T1 and the paralleled contacts of the timer
line through the conductors |39, |4I, II1 and 95. 25 switch TI and the A pole of the relay Rl'as previ
The two-pole, electro-magnetic relay R3 con
ously described.
The operation of the control system will best
stitutes the operating‘relay for the main air valve
55. One side of the operating coil |43 for this
be understood by reference to the schematic dia
the relay R4 is connected to the L| side of the ,
gram Fig. 6, which illustrates the control system
of this relay are connected to the line LI by the 30 in the normal position for automatic operation.
It will be noted that the timer motor TM and the
conductors | 4|, II1, and 95. The other contact
pilot light |21 are deenergized. The operating
H3A of the A pole of the R3 relay is connected
coil |19 for the line starter is energized through
to the control solenoid for the air valve by the
conductor |45. The L2 side of the operating coil
the push button or safety switch PBI (and P132,
|43 for the R3 relay is connected to the line L2 35 if used), the normally closed timer contacts T2,
relay and one of the contacts RBA of the A pole
through the normally closed timer switch T6 and
through the normally open contacts R3B of the
B pole of the relay, the connections being made
by the conductors I41, |49, |5I, |53, |55, and |25.
The contacts RBB of the B pole of the R3 relay
are paralleled by the normally open contacts T4
of the timer relay, the connections being made
through the conductors |5I, |51 and |49.
The R2 relay is used as the control relay for
the solenoid 8| which effects the operation of the ‘ u.
three~way valve. AOne side of the valve solenoid
8| is connected to the L2 side-of the line by the
conductor |59. The other side is connected >to
one of the contacts RZB of the B pole of the R2
relay by the conductor ISI. The other of the
contacts RZB is connected to the LI side of the
line through the normally closed timer switch
T5 by the conductors |53, |65, II'I, and 95. The
timer switch T5 is ‘paralleled by the normally
open, pressure switch |61 and by the conductors '
|69, 93 and 95, which tie to the LI side of the
line. The L2 side of the operating coil I1I for
the relay R2 is connected to the L2 side of the
line through the RZA contacts of the A pole of
the R2 relay by the conductors |13 and |25. The
-R2A contacts are paralleled by the >normally
opened timer sitch T3, the connections being
made by the conductors |15 and I 55. The L!
side of the operating coil I'II for the relay R2`is
tied to the conductor |33by the conductor |11
and the circuit is completed to the LI side of the
line through the paralleled pressure switch and
timer switch T5 by the conductors IE5, II'I, and _
95 or by the conductors |61, |69, 93, and 95.
and the line starter auxiliary switch LSA. The
apparatus is so arranged that the line starter for
the conveyor motor must be initially started by
manual operation. This is a safety precaution.
The operating coils for the relay RI, R2, R3 and
R4 are deenergized, and the contacts of the pres
sure switch are open as illustrated.
Assuming that the conveyor 43 or other means
is operating to discharge the waste or other ma
terial which is to be ejected into the ejector
receiver, the material will collect in the receiver
9 until it contacts a predetermined length of the
electrode 45 whereupon the operating coil 85 of
the induction relay will be suiiiciently energized
to eli’ect the operation of the induction relay.
The operation of this relay closes the relay con«
tacts IRC and thereby effects the energization of
the operating coil III for the relay RI and the
o_1_:>eratim,>r coil |81 for the time interval relay.
The relay RI then operates the contacts RIA
and RIB which are closed. The contacts RIA
parallel the contacts IRC of the induction relay,
and the contacts RIB effect the energization of
the timer motor TM.
.
The time interval provided by the dashpot or
other time delay means of the timer interval relay
is made suliiciently long to assure lthe ruiming of
the timer motor TM for a sufficient period to
effect the closing of the normally opened timer
switch TI which parallels the relay contacts RIB,
and as soon as the timer switch TI is closed, sub~
sequent operation of the timer motor is controlled
by the timer contacts and becomes independent
of the relay RI. Operation of the timer inter
The operation of the line starter is controlled 70 val relay de-energizes the operating coil ' I II of
the .relay RI and the operating coil I 91 of the
time interval relay. Beth relays then return to
netic relay R4, the timer contacts T2 and T8, kthe
the normal position.
push button switches PBI and FB2, and a pair of
auxiliary contacts LSA which are opened and
As the operation of the timer proceeds, the
closed in sequence with the line contacts of the 75 contacts T2 are opened. This de»encrgizes the
by the single pole, normally open, electro-mag
4.
2,380,651
conveyor, and opens the auxiliary contacts LSA
-other' delivery means to start up. The timer
contacts T2 are now -or previously may have
of the line starter.
been closed.
operating coil H9 ofthe line starter, stops the
l
The timer contacts T3 are next to close. This
effects the energization of the operating coil lll
of the relay R2 which controls the operation of
the three-way valve E55, the circuit being com
pleted through the still closed timer contacts T5.
Energization of the operating coil VH for the relay
R2 causes the relay contact RZA and REB to close.
REA parallels the timer contacts T3 and holds
'
Further operation of the timer contacts opens
the contacts T1 which de-energizes the relay R4,
thereby causing the relay contacts R4A to be
opened and the LSA contacts to be closed; opens
the timer contacts T8, and finally opens the con
tacts Tl which stops the timer motor TM. The
conveyor motor continues to operate notwith
standing the lopening of the contacts TS and R4A
since these contacts are paralleled by the then
closed contacts LSA and T2. The timer appa
quent opening of the timer contacts T3. The
ratus and the complete control system is then
closing of the RZB contacts of the relay R2 effects
restored to the normal running position, as illus
the energization 4of the three-way valve 65 through
trated in Fig. 6, and is ready to repeat the cycle.
a circuit which is completed by the closed timer
The pilot light |21 is lit when the timer motor
contacts T5.
TM is energized and provides a convenient means
The operation of the three-way valve E5 moves
for indicating when the timer mechanism is run
the control element "at of that valve from the po
sition of Fig. 3 to the position of Fig. 4, and 20 ning.
If it is desired to operate the apparatus under
admits pressure air to the top of the piston 35
hand control this may be done by moving the
which operates the flapper valve 25. The :dapper
main control switch t! to the H or hand operated
valve 25 then closes, and is held in a closed posi
position as shown by the schematic diagram of
tion by the pressure air.
Fig. 6. Movement of the control switch 8l to
` The timer contact Tet is next to operate and
this position will effect immediate operation of
this effects the energization of the operating coil
the induction re1ay,and the samesequence of con
E43 for the relay R3» which controls the opera
trol operations as previously described will take
tion of the main air valve t3, the circuit being
place. ït is also possible to effect the operation
completed through the still closed timer con
of the apparatus by the use of a cyclic timing
tacts TS. Operation of the relay R3 closes relay
means. To do this. the main control switch is
contacts RSA which energizes the main air valve
put into automatic position, and a, cyclic control
53 and also closes the RBB contacts which
switch of any standard type is connected across
parallel the timer contacts T4 thereby permitting
the terminals of the operating coil of the induc
the relay R3 to hold independently of the sub
tion relay in place of the electrode connections.
sequent. opening of the timer contacts T4. Oper
An important feature of the invention is the
ation of the air valve 633 admits pressure air to
means provided for effecting automatic clean
the top of the receiver 9 through the main inlet
ing of the electrode shield (t9 which is illus
pipe 55 for a period which is determined by the
trated particularly in Figs. 1 and 2. The elec
time interval between the closing of the timer
40 trode shield A9, as previously described, is a
contacts Tt (which operates the relay R3) and
cylindrical cup extending downwardly into the
the opening of the timer contacts T6. Opening
receiver tank 9 and the electrode 45 is locat
of
and
thecauses
timer the
contacts
air valve
T6 de-energizes
t3 to be shut
theoff.
relayThe
ed centrally of this cup. During normal op
eration it has been found that there has been
period of time during which pressure air is
the relay energized independently of the subse
admitted to the interior of the receiver can be
readily varied in accordance with the material
being handled.
Admission of pressure air to the interior of thc
receiver effects the operation of the pressure
switch which is in parallel with the timer contact
T5. Hence, the opening of the timer contacts T5
' a tendency for material to collect in this shield
and since this sometimes adversely affects
the operation `of the control mechanism, an
automatic cleaning means for the electrode
shield and insulator has been. provided. This
constitutes a jet type, air inlet lill which
50 means
is supported in the upper end of the shield 49
and is arranged to direct a stream of air cir
(which occurs at about the same time as the open
cularly of the shield in the region of the elec
ing of the timer contacts T6 to eiîect closing of the
trode insulator al. This jet tube §91 is con
main air valve 63) does not de-energize the con
trol relay R2 for the three-way valve 65 and that 55 nected to the main air inlet pipe 55 by a suit
able conduit lSQ, and it will be noted that air
valve remains in the Fig. 4 position until the
will be caused to flow through the jet tube |97
ejection of the contents of the receiver lowers
during each operation of the apparatus.
the pressure sufficiently for the pressure switch
The ejector apparatus described in the fore
to open. At this time.- since the contacts T5 have
previously been opened and are still open, the 60 going, is a much simpler and much more satis
factory device than the arrangements previously'
operating coil ill for the'relay R2 will be de
known to the art. A particular advantage of the
energized, the contacts REA and RZB opened and
apparatus consists in its use of only one valve
the three-way valve 65, permitted to return to its
at the inlet end of the ejector, as contrasted with
normal position illustrated in Fig. 3. When this
the use in the prior structures of a valve or
occurs, the cylinder 3l for the valve operating
valves at both the inlet and the outlet ends of
piston 35 is vented to the air, and the flapper>
the receiver. The elimination of all valves ex
valve 25 thereupon returns to its open position.
cept for the single valve at the inlet end of the
Subsequent operation of the timer effects the
receiver is a most important feature of the in
closure of the contacts Tl which energizes the
operating coil §33 for the relay R4 and closes the H vention and contributes substantially to its im
proved reliability of operation.
contacts RHA of that relay. At about this same
Various types of pneumatic ejectors and con
time the timer contacts T8 are also closed, and
trol systems therefor may be constructed in ac
the circuit for the operating coil H9 of the line
cordance with the principles disclosed in the
starter or other control means for the conveyor
43 is re-energized. This causes the conveyor or 7 5 foregoing. Accordingly, it is my desire that the
2,380,651
accompanying claims shall be given the broad
est reasonable construction consistent With the
5
gated, upright receiver having an inlet vopening
adjacent its top and an outlet opening adjacent
language appearing therein.
its bottom, conveyor means actuable to deliver
material to be handled by said apparatus into
said receiver through said inlet opening, a flap
valve movable to open and to close the said in
ing adjacent its top and an outlet opening ad
let opening in said receiver, means including a
cylinder and a piston movable in said cylinder for
jacent its bottom, conveyor means actuable to
deliver material t0 be handled by said apparatus
operating said flap valve, a source of pressure
into said receiver through said inlet opening,-a 10 air, means_including a conduit and a three-Way,
electrically operated valve for connecting said
flap valve movable to open and to close the said
source of pressure air to said piston and cylinder,
inlet opening in said receiver, an air motor for
operating said flap valve, a source of pressure
said three-way valve being movable from a nor'
air, means including a conduit and a three way
mal vent position, in which position said source
valve for connecting said source of pressure air
of pressure air is disconnected from said piston
and cylinder and said cylinder is vented to the
to said air motor, said three Way valve being
atmosphere, to an operating position, in which
movable from a normal vent position, in which
position said source of pressure air is discon
position said vent is closed and said piston and
cylinder are.connected to said source of pres
nected from 'said air motor and said air motor
is vented to the atmosphere, to an operating po 20 sure air, means including other conduit means ì
and an electrically operated. main air valve for
sition, in which position said vent is closed and
connecting said source of pressure air to the up~
said air motor is connected to said source of pres
sure air, means including other conduit means
per end of said receiver, said main air valve
and a main air valve for connecting said source
being movable from a normal closed position, in
of pressure air to the upper end of said receiver, 25 which position said source of pressure air is dis
said main air valve being movable from a nor
connected from said receiver, to an operating po
mal closed position, in which position said source
sition, in which position pressure air is admitted
of pressure air is disconnected from said receiver,
to the upper endof said receiver, and electrically
to an operating position, in which position pres
operated control means, including a motor driven
sure air is'admitted to the upper end of said re-k 30 timer and a relay for operating each of said elec
ceiver, and an electrical control means includ
trically operable valves, which is actuable to
ing a timer mechanism Which is operable to ef
eiïect sequentially the stopping of said conveyor,
I claim:
l. In apparatus of the class described, an
elongated, upright receiver having an inlet open
fect sequentially the stopping of said conveyor,
movement of said three-way valve to the operat
the movement of said three Way valve from the
ing position thereof, thereby effecting movement
normal to the operating position thereof, thereby 35 of said flap valve to the closed position, opera
eiîecting movement of said flap valve to the
tion of said main air valve to admit pressure air
closed position, operation of said main air valve
to the upper end of said receiver for a predeter
to admit pressure air to the upper end of said
mined period of time suñicient to accomplish the
receiver for a predetermined period of time suf
pneumatic ejection of the contents of said re
ficient to accomplish the pneumatic ejection of 40 ceiver, the closing of said main air valve, move
the contents of said receiver, the reclosing of
ment of said three-Way valve to said normal
said main air valve, movement of said three Way
vent position whereby said piston and cylinder
valve to said vent position whereby said flap
-are vented and said ñap valve is opened, and
valve is reopened, and the starting up of said
the starting up of said conveyor, said receiver
conveyor, said receiver outlet being open at all 45 outlet being open at all times during the opera
times during the operation of said apparatus.
' tion o-f said apparatus.
2. In apparatus of the class described, an elon
HAROLD T. JEFFERY.
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