close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3058508

код для вставки
Oct- 16, ‘1962
c. w. VOGT
3,058,498
CONTINUOUS FEEDING MECHANISM FOR FILLING APPARATUS
Filed Nov. 25, 1958
6 Sheets-Sheet 1
INVENTOR.
I\
m,
CLARENCE W V061‘
M (in . MVM
5
/5MATToR/v£yg
Oct- 16, 1962
c. w. vos'r
3,058,498
CONTINUOUS FEEDING MECHANISM FOR FILLING APPARATUS
Filed Nov. 25, 1958
6 Sheets-Sheet 2
/0
2
IN VEN TOR.
CLARENCE W V067"v
BY
444 ATTORNEYJ
Oct. 16, 1962
3,058,498
C. W. VOGT
CONTINUOUS FEEDING MECHANISM FOR FILLING APPARATUS
6 Sheets-Sheet 5
Filed NOV. 25, 1958
Y (B)
69
57
80
_INVENTOR
CLARENCE IM I/OG‘T
BY
' A» ATTORNEYJ“
Oct. 16, 1962
3,058,498
c. w. VOGT
CONTINUOUS FEEDING MECHANISM FOR FILLING APPARATUS
6 Sheets-Sheet 4
Filed Nov. 25, 1958
35
39
BY
Add ATTORNEW
Oct. 16, 1962
3,058,498
C. W. VOGT
CONTINUOUS FEEDING MECHANISM FOR FILLING APPARATUS
6 Sheets-Sheet 5
Filed Nov. 25, 1958
WY
49
7
47
B
w
3.
IY
am
Y
B
N
I
R
,
a”g
M E
B
15 VWm.TV2
T
(W.
W
AA; ATTORNEW
50
Oct. 16, 1962
c. w. voe'r
3,058,498
CONTINUOUS FEEDING MECHANISM FOR FILLING APPARATUS
Filed Nov. 25, 1958
6 Sheets-Sheet 6
03
E1
BY
‘
3,058,498
,.
tates
tet
1
3,058,498
CGNTENUQUS FEEDING MECHANISM FUR
FILLENG APPARATUS
Clarence W. Vogt, Rte. 4, Weston, Conn.
Filed Nov. 25, 1958, Ser. No. 776,308
12 Claims. (£31. 141»-5)
KB
Patented Oct. 16, 1952;
2
FIGURE 9 is a chart showing the time cycle of opera
tion of the valves during the operation of the apparatus.
The apparatus disclosed herein operates basically on
the principles disclosed in my Patent No. 2,935,233 and
my applications Serial Nos. 713,887, 743,041 and 758,068.
In the apparatus disclosed herein, ?owable solid material
is introduced into a hopper and is supplied under the
control of a valve to a magazine from which the material
This invention relates to the packaging of materials and
is discharged by means of gas under pressure into a con
it relates particularly to apparatus for ?lling boxes, car
tainer or receptacle, the receptacle either being provided
tons and other enwrapments with ?owable solid material. 10
The term “?owable solid material” as used herein means
solid material in the form of powder, grains, particles,
kernels, pellets, pieces or the like of uniform or varying
size in which the materials may be ground, crystalline,
?aky or comminuted and free~?owing or ?owable under
gaseous pressure.
The apparatus embodying the present invention is an
improvement over apparatus disclosed in my copending
applications, Serial No. 758,068, ?led August 29, 1958,
Serial No. 743,041 ?led June 19, 1958, Serial No. 594,152
?led June 27, 1956 (now US. patent No. 2,935,233), and
Serial No. 713,887 ?led February 7, 1958, and ditfers
therefrom by the inclusion of the mechanism enabling
the apparatus to ?ll containers substantially continuously.
More particularly, in accordance with the present in 25
vention, an apparatus has been provided which has a
feeding magazine provided with multiple ?lling nozzles to
with porous ?ltering media or being associated with a
?ltering or porous member through which air can escape
while the solid material is retained in the receptacle or
container. In this way, successive charges of uniform
volume and density are introduced into the receptacles
or containers.
In the prior devices, the ?lling operation is interrupted
to enable charges of ?owable solid material to be trans
ferred from the hopper to the ?lling magazine. Com
munication is cut off between the magazine and the hop
per while material is being ‘discharged from the magazine
into the container or the receptacle.
In accordance with the present invention, material is
transferred from the hopper to the magazine and material
is discharged from the magazine into containers substan
tially continuously so that a greatly increased number of
containers can be ?lled in a given period of time.
Referring now to FIGURES 1 and 2 of the drawing,
which receptacles or containers such as cartons, boxes,
a typical apparatus embodying the present invention in
bags or the like, can be supplied for ?lling therefrom
and to which material is delivered from a supply hopper 30 cludes a hopper 10 having a pair of downwardly diverg
substantially continuously and without substantial inter
ruption of the ?lling operation. Inasmuch as the feed
magazine is ?lled substantially continuously and the flow
able solid material in the magazine is continuously sub
ing discharge portions 11 and 12, which communicate
with the openings 13 and 13a, shown in FIGURES 2, 7
and 8 through the top of valve housings 14 and 15 of the
control valves A and X. The control valves A and X
are of the type disclosed in my copending application
Serial No. 620,531 ?led November 5, 1956, now Patent
No. 2,985,340. The valve A by way of example, includes
jected to gaseous pressure for discharge to the container
or receptacles, much higher ?lling rates and much higher
?lling capacity can be achieved than with the prior
apparatuses. Moreover, a substantially uniform gas pres
a rotary ball valve member 16 having a diametrical pas
sure can be maintained in the magazine during ?lling so
sage 17 and an intersecting radial passage 18. Ball valve
that the charges of material of uniform volume and weight 40 member 16 is rotatable to a position in which the diametri
are ?lled into the containers or receptacles.
cal passage 17 is in alignment with the opening 13 and a
The new apparatus not only includes means for con
bottom opening 19 in a spring-biased retaining ring 20
tinuously ?lling the magazine of the apparatus with ?ow
which is mounted in the lower end of the valve. housing
able solid material but also includes mechanism whereby
14. The ball valve member is also rotatable to the posi
45
bridging or hanging of the material in the magazine and
tion shown in FIGURE 2 in which the diametrical passage
valves is avoided and whereby dribbling of the material
extends horizontally and the radial passage 18 is in align
from the discharge ports of the apparatus is effectively
ment with the discharge opening 19‘. The ball is moved
eliminated despite. the presence of substantial or high gas
between the two: positions mentioned by means of a. rack
pressure in the discharge magazine.
50 member 21 supported in a guide plate 22; on a platform
For‘ a better understanding of the present invention,
or plate 23 on which the. valves A and X are also mounted.
reference may be had to the accompanying drawings in
Rack 21 meshes with pinion 25 (FIG. 1)‘ to rotate. it and
the shaft 24' which is connected. to the ball member 16
which:
FIGURE 1 is a side elevational view of a typical ?lling
and thus: enables it to rotate. Leakage around the ball is
apparatus of the type embodying the present invention, 55 prevented by means of a sealing ring 26 carried by the
top of the housing 14 and the sealing surfaces. 27 of the
with portions thereof broken away to disclose details of
retaining ring 20. Air or gas under pressure is admitted
construction;
into the valve casing through porous ?ltering discs or
FIGURE 2 is a view in section taken on line 2-2 of
plates 28 and 29 formed of sintered porous metal or the
FIGURE 1;
FIGURE 3 is a view in section taken on line 3-3 of 60 like in opposite sides of the valve housing. The ?lter
plates 28- and 29 permit the escape of air while preventing
FIGURE 1 and also illustrating certain control valves
the escape of the ?owable solid material therethrough.
therefor schematically;
Valve. X is of similar structure and it oscillated by means
FIGURE 4 is a view in cross section taken on line 4-4
of a similar rack 21a and pinion 25a drive.
of FIGURE 3;
Directly beneath the valve A is a similar" control valve
65
taken
on
line
5-5
FIGURE 5 is a view in cross section
13 and directly beneath the valve X is a second control
of FIGURE 1;
valve Y. As shown in FIGURES l and 2, the valves
FIGURE 6 is a view in cross section taken on line- 6——6
B and Y are interposed between a pair of supporting
of FIGURE 4 but omitting‘ the nozzle liners;
plates 23 and 31. One feature in which the valve B and
FIGURES 7 and 8 are schematic illustrations of the re.
Y differ from valves A and X is that a sealing ring 32
lations of the valves in the ?lling apparatus whereby a 70 corresponding to the sealing ring 26 is mounted in the
substantially continuous ?lling of the magazines oi the
lower end of the valve housing 33 and the retaining
apparatus are achieved; and
3
assume
AI
54- and 55 and through the diverging passageways 76 and
77 which communicate with the space between the liners
ring 34 is mounted at the upper end of the housing 33.
Moreover, instead of a spring member corresponding to
the pressure spring 35 of valve A, pneumatic means in
cluding a diaphragm 36 and a source of air pressure
37 communicating therewith under the control of a valve
38 are provided for maintaining sealing engagement be_
tween the ball 39 of valve B, for example, and the seal
ing rings 34 and 32 when gas pressure is supplied to the
values A and B and for releasing the valve B for rotation
when the gas pressure supplied to the valves A and B is
relieved. The ball member 39 is also rotatable between
a position in which the diametrical passage 40 therein
is in a vertical position and a position in which the radial
passage 41 is in a vertical position and communicating
with an opening 42 in the supporting plate 31. Such rota
tion of the ball member 39 is accomplished by means of 15
59 and 60 and the inner walls of the nozzles 54 and 55.
By appropriately controlling the introduction of air, that
is by introducing air and venting it by means of an appro
priate valve, the liners 59 and 60 can be flexed or ex
panded and contracted at a low or high speed depending
upon requirements.
As shown in ‘FIGURES l, 3 and 4, containers C and
C’ are carried on supports 80, 81 which are raised and
lowered alternately and moved transversely to enable
containers to be placed on the supports and removed
therefrom. As shown in FIGURES 1 and 4, one of the
containers, for example container C’, is raised so that
its upper edge engages a sealing gasket 82 ?xed to the
lower edge of the bottom plate 83 which extends between
a rack 43 and a pinion 44 on a shaft which is connected
the nozzle sections 54 and 55. Mounted above the
with the ball 39. A similar rack 45 and pinion 46 also
gasket 82 which is carried below nonle 55 is a ?lter
rotate the ball member 47 of the valve Y, as shown in
member 84 formed of porous sintered metal or the like
FIGURE 1. Any suitable mechanism for reciprocating
the racks 21, 21a, 43 and 45 may be used, such as cams 20 which has a central opening 84' communicating with
the passage 62, for example, and also with a recess 85
or electric, air or hydraulic motors.
from
which air can escape by means of a conduit 86 and
The opening 42 beneath the valve B and a correspond—
a control valve 86a (FIG. 3) to atmosphere. If de
ing opening 49 (FIG. 4) below the valve Y communicate
sired, the valve 86a can also be connected to a source of
with the upper end of a magazine 50 which includes a
generally rectangular housing member 51 bolted or other 25 gas under pressure so that the gas, such as air, can be
forced through the porous plate 84 as indicated in
wise secured against the lower surface of the supporting
FIGURE 3 in order to clean it and to dislodge any
plate 31 and having a lower peripheral ?ange 52 thereon
material which might adhere to it at the conclusion of a
which carries a nozzle member 53 including a pair of
?ltering
operation. Moreover, the valve 86a may be used
generally conical discharge nozzles 54 and 55 having a
to introduce an inert gas into the top of a container, if
peripheral vflange 56 extending around the nozzle member 30 desired.
and having set screws 57 which may be turned in against
the member 51 to hold the nozzle member 53 against
the lower edge of the member 51. As shown in FIG
URES 3, 4 and 5, the member 51 is provided with a
resilient liner 58 formed of ?exible rubber, plastic or the
Inasmuch as it is desired to ‘?ll one container, for
example the container C’, while another container C is
being moved into or out of a position to receive a charge
from the magazine section 54, valve means is provided
for preventing discharge of material from the nozzle
like which has its upper edge clamped between the
member 54 while material is being discharged from the
supporting plate 31 and the member 51 and its lower
nozzle member 55.
edge clamped between the lower edge of the member 51
The tubular portions 61 and 62 of the liners 59 and
and upper surface of the nozzle member 53. Also, the 40
69 form parts of the valves in the manner disclosed in
nozzles 54 and 55' are provided with unitary resilient
my application Serial No. 713,887 ?led February 7,
rubber liners 59 and 60 which have their upper periphery
1958. As shown herein, each nozzle member 54, 55
gripped between the nozzle member 53 and lower edge
carries
an air motor 87 and 88 including a cylinder 89
of the member 51. Also, the lower ends of the funnel
like liners 59 and ‘60 are provided with narrow tubular 45 or 90 having a transverse diaphragm 91 or 92 to which
is connected a plunger 93 or 94. The end of the plunger
portions 61 and 62 which extend through tubular open
94, for example, is formed to engage one side of the
ings 63 and 64 at the lower end of the nozzle housing.
tubular portion 62 on the liner 60 to squeeze the tubular
In order to maintain the liner-s 59 and 60 in position such
portion shut or release it depending upon whether air
that they can ?ex inwardly and outwardly, ribs 65 and 66
may be formed on the inner surfaces of the nozzles 54 50 pressure is applied to the back of diaphragm or vented
from the cylinder 88 through the pipe 88’. As shown in
and 55. In this way, gas pressure against the inner sur
FIGURE 4, air pressure is supplied to the motor 87 while
face of the liner 58 and the liners 59 and 60 will cause
air is vented from the motor 88 so that the tubular portion
them to expand whereas pressure against their outer sur
61 is squeezed shut while the tubular portion 62 is
faces will cause them to contract. The liner 58 can be
enabling material to be blown into the con
expanded and contracted by means of a mechanism like 55 opened
tainer C’.
that disclosed in my copending application Serial No.
An apparatus as described above has a cycle of opera
758,068, ?led August 29', 1958. As shown in FIGURES
tions
which will be understood more readily by reference
1, 3, 4 and 5 pairs of rods 67 and 68 are carried by a
to FIGURES 7, .8 and 9 of the drawings. FIGURE 7,
yoke or frame 69 extending around the collar member
51. Elongated heads 70 and 71 ‘are mounted on the 60 discloses the valves A, B, X and Y‘in positions corre
sponding to the left hand half of the timing chart shown
inner ends of the rods and engage the outside of the
in FIGURE 9. ‘Thus, valve A is closed to the hopper
‘liner 58. An air motor 72 or its equivalent is connected
10 and is open to the valve B. The valve B is open to
to the yoke 69 by means of the rod 68' to reciprocate
the valve A and to the magazine. Valve X is open to
the yoke 69 in a horizontal plane and press the heads 70
and 71 alternately against opposite sides of the liner 58 65 the hopper and to the valve Y while ‘the valve Y is
open to the valve X but closed to the magazine 50.
thereby to de?ect it and to dislodge any material clinging
thereto. The power required for moving the yoke can
be reduced and damage to and wear on the liner 58 can
The vertically spaced valves A and B, and the valves
X and Y form chambers in which material can :be re
ceived and trapped or isolated selectively from the hopper
be minimized by maintaining equal pressures on oppo
or magazine.
site sides of the liner 58. To that end air may be supplied 70
With the valves in ‘the positions shown in FIGURE 7,
around the outside of the liner 58 through the pipe 58'
the
solenoid valve 90 which is connected to the valve
('FIGS. 3 and 4) at the same pressure as the gas pressure
X is open to atmosphere or connected to a source of
inside the liner 58.
reduced pressure. likewise, the valve Y is open to
The liners 59 and 60 can be ?exed by introducing air
intermittently through a passage 75 between the nozzles 75 a vacuum or to atmosphere through the control valve
91 which is connected to the air pressure line 92 and to
3,058,498
5
a suction line 91' or atmosphere. Value A is open to
a source of gas under pressure through its correspond
ing solenoid valve 93 as is the valve B through its control
valve 94 which is connected to the air pressure line 95
and the suction line 96. Under these circumstances,
?owable solid material will be fed from the hopper 10
into the valve housings X and Y while at the same time
?owable solid material in the valve housings A and B
will be blown out of them into the magazine 50. During
this blowing operation, one of the tubular portions 61
or 62 will be open while the other will be closed. Flow
able solid material will be blown by the gas pressure
introduced through valves A and B into a container
communicating with the open tubular portion. During
blowing, a ?lled container is withdrawn from engage
ment with the nozzle portion having a closed tubular
portion 61 or 62 therein and is replaced by an empty
elements, said valve elements, being movable selectively
to a ?rst position for admitting said solid material from
said hopper into said chamber and to a second position for
discharging said material from said chamber into said
magazine, means for moving the elements of said units
alternately to said ?rst and second positions, the valve ele
ments of the said one unit being in said second position
when the valve elements of the other unit are in said
?rst position, and means for supplying gas under pressure
to said chamber when said valve units are in said second
position and venting gas from said chamber when said
valve units are in said ?rst position.
2. The apparatus set forth in claim 1 comprising valve
means for controlling flow of said solid material through
said discharge nozzle and means for actuating said valve
means to open and close the nozzle alternately.
3. The apparatus set forth in claim 1 in which the
pair of valve elements comprise a pair of balls having
intersecting diametrical and radial passages, housings
changed by means of these corresponding rack and 20 rotatably receiving said balls ‘and having aligned inlets
and outlets therein, ‘said balls being rotatable to align
pinion drives to the positions shown in FIGURE 8 and
their diametrical passages and their radial passages alter
indicated at the right~hand section of the chart shown
nately “with the aligned inlets and outlets, and means for
in FIGURE 9 :so that the valve A is in communication
rotating the balls to align the diametrical passage of one
with the valve B and the interior of hopper 10 while
valve B is out of communication with the magazine 5% 25 ball with the inlets and outlets when the radial passage of
the other ball is aligned with the inlets and outlets.
but is in communication with the valve A. The valve
4. The apparatus set forth in claim 1 comprising
X is moved out of communication with the hopper 1t)
?exible
lining means in said magazine and discharge
and into communication with the valve Y while the valve
nozzles and means for ?exing said lining means to con
Y communicates with the magazine and the valve X.
The blow and suction valves 9% and 93 will be reversed 30 trol flow of solid material through said magazine and
nozzles.
so that gas under pressure is supplied through the valves
5. Apparatus for ?lling containers comprising a hopper
X and Y to ‘discharge material therefrom into the
for receiving ?owable solid material, a magazine for re
magazine and to blow material from the magazine into
ceiving said material from said hopper, a discharge
a container below one of the magazine nozzles. At
nozzle communicating with said magazine for discharg
35
the same time ?owable solid material can be charged
ing said material therefrom, a pair of valve units inter
by suction or any suitable feeding means, such as screws
posed between said hopper and said magazine for trans
in the hopper into the valves A and B ready for dis
ferring material from said hopper to said magazine, each
charge into the magazine. In this way, a substantially
unit including a housing having a pair of valve chambers
continuous flow of material between the hopper and the
magazine is assured and inasmuch as the liners of the 40 therein and a cavity between and connecting said‘ cham
bers, a valve member mounted rotatably in each chamber,
magazine and the nozzles are agitated or ?exed, a con
container. As soon as the material is discharged from
the valves A and B, the positions of the valves are
tinuous downward feed and a uniform distribution of
the material in the magazine 50 is assured. Moreover,
the containers can be brought into communication with
the discharge nozzles and moved out of communication
with little or no interruption in operation so that a sub
each valve member having a diametrical passage and an
intersecting radial passage, means to rotate said valve
members to a ?rst position in which the radial passage
of one valve member communicates with the hopper
through the diametrical passage of the other valve mem
ber and all of said passages are out of communication
stantially continuous ?lling of containers is assured. It
with said magazine, and a second position in which the
will be understood of course that the timing of the valves
radial passage of said other valve member communicates
at the lower ends of the ?lling nozzles will be related to
the movement of the containers into and out of com 50 with said magazine through the diametrical passage of
munication with the ?lling hoppers but the timing of
the valves A, B and X, Y while related to each other need
not necessarily be related to the operation of the ?lling
nozzles inasmuch as a substantially constant pressure is
maintained within magazine for ?lling the containers.
In this way, charges of uniform volume and density can
be introduced rapidly and e?iciently into the containers
without loss of ?lling time.
It will be understood that the invention is susceptible
to considerable modi?cation with regard to the size and
number of the elements. Thus, more than two ?lling
nozzles may be provided at the lower end of the magazine
50 depending upon the volume of the material to be han
dled. Accordingly, the form of the invention described
herein should be considered as illustrative and not as
limiting the scope of the following claims.
I claim:
1. Apparatugsr'for ?lling receptacles comprising a hop
said one valve member and all of said passages are out
of communication with said hopper, means for rotating
the valve members of said valve unit to position the valve
members of one unit in said ?rst position when the valve
members of the other unit are in said second position,
and means for supplying gas pressure to said magazine
through said valve units when they are in said second
position.
6. The apparatus set forth in claim 5 comprising
means for producing a reduced pressure in each valve
unit when the valve members thereof are in said ?rst
position.
7. The apparatus set forth in claim 5 comprising a
valve means in said discharge nozzle and means for
opening and closing the valve means in said discharge
nozzle alternately.
8. The apparatus set forth in claim 7 comprising
means for moving members having cavities to be ?lled
with said solid material into and out of ?lling relation to
per for receiving ?owable solid material, a magazine
for receiving said material from said hopper, a dis— 70 said nozzles while said valve means are closed.
9. Apparatus for ?lling receptacles'with comminuted
charge nozzle communicating with said magazine for
material comprising a magazine, a source of comminuted
material, means for maintaining said magazine at a
higher gas pressure than at said source, means for with
drawing increments of said material from said source,
of valve elements and a chamber between said valve 75
discharging said material ‘from said magazine, valve
mechanism interposed between said hopper ‘and said mag
azine including two valve units, each unit having a pair
7
3,058,498
means for applying gas pressure to said increments,
means for ‘introducing said increments of such material
under said applied gas pressure into said magazine, a
discharge outlet in said magazine, valve means control
ling said discharge outlet, a resilient liner in said maga
zine, means for ?exing said liner to displace said ma—
terial away from said liner, and in which said valve
means comprises a tubular portion of said liner extend
ing into said~outlet, a plunger movable axially in one
direction to compress and close said tubular portion and
in another direction to allow said tubular portion to
open, and means for moving said plunger in said one
and said another directions.
10. A method of ?lling receptacles with comminuted
material from a magazine maintained at a gaseous pres
sure higher than atmospheric pressure which comprises
repeatedly withdrawing increments of commiuuted ma
terial from a zone of lower gas pressure and introducing
said increments alternately into diiferent chambers in
communication with said zone and isolated from said
magazine, maintaining a gas pressure in said chambers
not exceeding the gas pressure in said zone While the zone
8
the gaseous pressure in said chamber to at least the
pressure maintained in said magazine, connecting said
chamber to said magazine to discharge said material in
said chamber into said magazine, disconnecting said
chamber from said magazine, reducing the pressure in
said chamber to ‘not substantially in excess of the pressure
at said source, connecting said chamber to said source
and repeating the preceding steps to maintain a supply of
said material in said magazine.
12. Apparatus for ?lling receptacles with ?owable
solid material comprising a source of ?owable solid ma
terial, a magazine for receiving said ?owable solid
material, said magazine having a discharge outlet, means
for opening and closing said outlet, means for maintain
15 ing a gas pressure in said magazine higher than atmos
pheric and higher than the gas pressure at said source
to discharge portions of said material through said outlet
into a receptacle in a zone at lower pressure when said
outlet is open, a transfer unit between said source and
said magazine having a pair of valves and an interposed
chamber, means for introducing gas under pressure into
and discharging gas from said chamber, ?lter means
and chambers are in communication, isolating said cham
retaining said material in said‘ chamber while gas is being
‘bers from said‘ zone after said increments are introduced
discharged therefrom, and means for actuating said valves
into said chambers, increasing the gas pressure on said 25 and
said means for introducing and discharging gas in
increments in said chambers to about the pressure in said
timed
relation in the following cycle; disconnect said
magazine and introducing them alternately into said
chamber from said source and said magazine, discharge
magazine, maintaining the pressure in said magazine at
said higher pressure and intermittently forcing portions
of said material from said magazine by said gaseous pres
sure into successive receptacles in a zone at a lower
pressure than that maintained in said magazine while
venting gas from said receptacles.
11. A method of supplying ?owable solid material to
gas from said‘ chamber to reduce its pressure to not in
excess of the pressure at said source, connect said cham
ber to said source to introduce said material into said
chamber, disconnect said chamber from said source,
introduce gas under pressure into said chamber to in
crease the pressure therein to substantially the pressure
in said magazine, connect said chamber to said magazine
a magazine maintained under gaseous pressure substan 35
to discharge said material from saidv chamber into said
tially higher than atmospheric pressure from which por
magazine; and repeating said cycle to maintain a supply
tions of said material are discharged intermittently by
of said solid material in said magazine.
References Cited in the ?le of this patent
pressure, said method comprising the steps of discharging
a ?owable solid material from a source of said material 40
UNITED STATES PATENTS
said gaseous pressure to ?ll containers in a zone of lower
into a chamber connected to said source and said maga
zine, said material at said source being under less gaseous
pressure than that maintained in said magazine, discon
necting said chamber from said magazine While material
is being discharged into said chamber from said source,
maintaining in said chamber gaseous pressure not sub
stantially exceeding the pressure at said source during
discharge of said material into said chamber, disconnect
ing said chamber from said source, thereafter increasing
1,543,716
1,593,308
2,138,356
McCue ______________ __ June 30, 1925
McCue ______________ __ July 20, 1926
Ryan et al. __________ __ Nov. 29, 1938
2,611,938,
Hanseberg __________ __ Sept. 30, 1952
2,642,215
2,660,394
2,720,375
2,761,605
2,817,461
Carter ______________ __ June 16,
Skeuse et al. ________ __ Nov. 24,
Carter ______________ __ Oct. 11,
Pahl et a1 _____________ __ Sept. 4,
Gilberty ____________ __ Dec. 24,
1953
1953
1955
1956
1957
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 062 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа