US3097711A - Skip loading and weighing apparatus - Google Patents

Skip loading and weighing apparatus Download PDF

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US3097711A
US3097711A US851594A US85159459A US3097711A US 3097711 A US3097711 A US 3097711A US 851594 A US851594 A US 851594A US 85159459 A US85159459 A US 85159459A US 3097711 A US3097711 A US 3097711A
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bin
door
contents
pocket
open
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US851594A
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James W Clark
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Lake Shore Inc
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
    • G01G13/02—Means for automatically loading weigh pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism

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  • Another object is to provide an improved dumping door apparatus having a toggle ⁇ actuating mechanism which acts to lock the door in the closed position against the weight of the material in the bin and ⁇ at the same time is adapted when actuated to rapidly open the doo-r and smoothly dump the contents into a skip or other receptacle with a minimum of spillage.
  • apparatus including la storage bin having a discharge opening in the bottom portion thereof to ⁇ which the content-s will flow by gravity.
  • a dumping door is movably mounted at the discharge opening and adapted to open and close said opening as it is actuated from one position to another.
  • a suitable loading means such as a conveyor is provided for loading the storage Ibin and a door actuating means, such as a pneumatic cylinder, is provided for actuating the door from one position to another.
  • the Istorage bin is mounted for vertical movement and is supported on a compressible n weight sensitive means which is actuated by the increasing weight of the storage bin as it is loaded.
  • the weight sensitive means is :adapted to stop the loading means and energize the pneumatic cylinder to open the door and dump the bin when the contents of the bin reach a given weight.
  • the dumping door is actuated by a pneumatic cylinder land ⁇ a toggle actu-ating mechanism which includes a link member pivotally connected between the cylinder and the door and a pair of rigid arms pivotally connected between the link member and the side of the bin.
  • the arms are mounted so that with the door in its fully closed position the pivot point between the link ⁇ and door will lie above (on the door closing side) of an imaginary lineV drawn between the pivot points of one 4of the rigid arms.
  • the arms cooperate with the link to hold the door tightly in a closed position against the weight of the material in the bin with no forces acting on the parts tending to move them in the door opening direction.
  • the door is pivotally mounted along the upper edge of the discharge opening so that the load being dumped will aid in opening the door and thereby substantially reduce the ycylinder size and air required for actuation of the toggle mechanism.
  • FIG. l is a side elevation of a loading apparatus embodying the invention.
  • FIG. 2 is a front elevation of the apparatus shown in FIG. l with a part of the dumping door broken away;
  • FIG. 3 is a sectional view taken along line 3 3 of FIG. 1;
  • FIG. 4 is a sectional View taken .along line 4 4 of FIG. 2;
  • FIG. 5 is a detailed View of the weight sensing load transducer used in the loading apparatus
  • FIG. 6 is a side elevation (with parts broken away) of ICC ⁇ a loading apparatus showing a modification of the invention.
  • FIG. 7 is a front elevation of the apparatus shown in FIG. 6 with a part of the dumping door broken away.
  • the loading apparatus of this invention comprises a loading bin or pocket 10 which communicates with a skip 12 through an enclosed chute 14.
  • pocket 10 and chute 14 are installed in a concrete reinforced cavity 15 at the junction of a mine lateral and a vertical mine shaft in which skip 12 is hoisted and lowered on a wire rope 16.
  • pocket 10 The ore mined from the lateral is ⁇ dumped into the open top of pocket 10 by any suitable means such as a conveyor 18, as shown, or by dumping from cars or another ⁇ bin through power actuated gates.
  • Pocket 10 has a bottom 19 which slopes to discharge opening 20 ⁇ leading into chute 14. The slope of bottom 19 of the pocket is made substantially the same as the slope of chute 14 so that ore will flow smoothly from the pocket thnough the chute and into the skip.
  • Flow from pocket 10 through discharge opening 20 is controlled by a ⁇ dumping door 22 plvotally mounted on opposite sides of pocket :10 by means of stub lshafts 24 as shown in FIG. 3.
  • Pocket 10 is slidably mounted for vertical movement by means of angles 26 (with ywear plates 28) mounted in cavity 15 at each corner of the upper end of the pocket (FIG. 4) which cooperate with angles 30 (with wear plates 31) welded to the pocket to guide its vertical movement.
  • a pair of-guide members 33 (FIG. 2) mounted at the lower end of the pocket serve to guide its vertical movement in this area.
  • the weight of the pocket and its contents is supported by a load transducer 32 mounted directly beneath the pocket 'as shown in FIG. l.
  • transduced 32 includes a bearing plate 34 which receives the load through a pair of I-beams 36 fastened to the pocket 4and resting on the plate.
  • the load is supported by a compressible C-shaped member 38 ⁇ housed in a casing 40.
  • the load is transmitted to member 38 by means of a plunger 42 tted in a cavity 44 in the bottom of plate 34 and a ball 46 seated in sockets formed in the bottom of the plunger and the top of member 33.
  • Plunger 42 is mounted in a flexible diaphragm 4S fastened to the top of casing 40 to seal the parts inside the casing.
  • a precision switch 52 mounted on the top portion of C-mem ber 38 will tbe closed by a stationary stop 54 mounted on the bottom portion thereof.
  • the closing of switch 52 can be arranged to stop conveyor 1S and energize a door actuating pneumatic cylinder 56 if a trip switch (not shown) located in the shaft has been actuated to sense Jche presence of a skip at the end of chute 14.
  • Cylinder 56 is pivotally mounted on the front of pocket 10 by a pin 59, as shown, and has a piston (not shown) with a connecting rod ⁇ 61 pivotally connected to door 22.
  • cylinder S6 when cylinder S6 is energized, door 22 will be swung [from )the solid line to the dotted line positions shown in FIG. 1 to thereby dump the ore in pocket 10 through opening 20 and chute ⁇ 14 into skip 12.
  • FIGS. 6 and 7 show a modification of the invention wherein a toggle mechanism S of novel design is utilized to open and close a dumping door 60 pivotally mounted along the upper edge or a discharge opening ⁇ 62 of the loading ⁇ bin 64 by means of a rod 65.
  • Toggle mechanism 53 is actuated to open and close door 6% by means of a pneumatic cylinder 66 having a piston rod 72.
  • Cylinder -66 is pivotally mounted on the ⁇ front of bin 64 -by means of a bracket ⁇ 67 and a pin 68.
  • Mechanism 58 includes a link member 70 pivotally connected between brackets 74 Afastened to the underside of door 60 and the end of piston rod 72.
  • Link member 70 bas a pair of arms 76 pivotally connecte-d to brackets 74 by pins 78 and a pair of arms 80 pivotally connected to the end of piston ⁇ rod '72 by a pin 82.
  • a pair of rigid arms 84 are provided. Arms 84 are pivotally mounted a-t .one end on the sides of bin 64 by pins 86 and at the other end to link '70 by pins 88.
  • the iixed pivot points 86 of arms 84 are positioned so that when door 60 is in its fully closed position (as shown in solid lines in FIGS. 6 and 7) the pivots 78 between link 70 and door 60 will lie above (on the door closing side) of an imaginary line 90 drawn between ⁇ fixed pivot points 86 (between arms 84 and bin 64) and pivot points 88 (between the arms and link 70).
  • cylinder 66 is energized to retract piston rod 72 upwardly into the cylinder.
  • mechanism 58 acts to very slowly open door 60 in its initial movement and thereafter very rapidly open the door in the later stages of the dumping action. This quick opening action, whereby the load being dumped aids in opening the door, reduces stresses on the pants and substantially reduces the cylinder size and air required for actuation .of the mechanism.
  • Chute 92 is provided to carry the material from the bin into a skip or other receptacle. Chute 92 is cut back as at 94 at its upper end to provide clearance for the movement of toggle mechanism 58, and door 60 is provided with vertical side skirts 96 which cooperate with the sides of chute 92 in the open position to prevent spillage over the sides of the chute.
  • Apparatus for discharging the contents of a storage bin into a skip in a mine when -the contents reach a given weight comprising, a bin, a discharge opening in the bottom portion of said bin through which the contents vvill W :by gravity, a dumping door pivotally mounted along the upper edge of said discharge opening and adapted to open and close said opening as it is actuated from ione position to another, actuating means including a pneumatic cylinder and a toggle mechanism for actuating said door, said pneumatic cylinder pivotally mounted on the iront of said bin above said dumping door, mounting means on the sides of said bin ⁇ to provide lateral support to said 'bin and lto permit its vertical movement, and Weight sensitive means supported and mounted centrally below said bin, said means being responsive to and resisting ⁇ the vertical movement of said bin as it is being loaded and adapted to enengize said door actuating means to open said door and dump said bin when the contents of said bin reach the given weight.
  • said toggle mechanism includes a link member pivotally connected to Ithe front lof said door and extending forwardly trom said door when said door is closed for pivotal connection to said pneumatic cylinder, and a Irigid arm pivotally mounted at a xed point on said bin to the rear of said door, and pivotally connected to said link near the end of the link which is pivotally connected to said pneumatic cylinder, said iixed pivotal mounting point for said rigid arm located so that when said door is in its bully closed position said pivotal connection between said door and said link will lie on the door closing side of an imaginary line drawn between said xed mounting point and the pivotal connection between said arm and said link.
  • said weight sensitive means includes a compressible C-shaped member on which said bin is supported, the two ends of which are forced together as said bin is loaded, a casing housing the said C-shaped member, and a diaphragm means sealing lche C-shaped member within said casing and transmitting the vertical movement of said bin.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Refuse Collection And Transfer (AREA)

Description

July 16, 1963 J. w. CLARK 3,097,711
SKIP LOADINGAND WEIGHING APPARATUS Filed Nov. 9, 1959 3 Sheets-Sheet 1 ATTO Ne-.Y
July 16, 1963 J. w. CLARK 3,097,711
SKIP LOADING AND WEIGHING APPARATUS Filed Nov. 9, 1959 5 Sheets-Sheet 2 F'IGLB r a A INVENTGR JAMES W. CLARK WwW/MQ ATTORNEY July 16, 1963 Filed Nov. 9, 1959 J. W. CLARK SKIP LOADING AND WEIGHING APPARATUS 3 Sheets-Sheec BYu F.Z
A-r-roanev United States Patent O 3,097,711 S111? LADENG AND WEIGHENG APPARATUS laines W. Ciarlt, liron Mountain, Mich., assigner to Lahe Shore, inc., iron Mountain, Mich., a corporation of Michigan Filed Nov. 9, 1959, Ser. No. 851,594 3 Claims. (Cl. 177-106) This invention relates to loading apparatus and particularly to apparatus for loading a ski-p.
It is an object of this invention to provide la relatively lsimple and durable loading apparatus which will discharge a given weight of ore or other material at each dump.
Another object is to provide an improved dumping door apparatus having a toggle `actuating mechanism which acts to lock the door in the closed position against the weight of the material in the bin and `at the same time is adapted when actuated to rapidly open the doo-r and smoothly dump the contents into a skip or other receptacle with a minimum of spillage.
The objects of this invention are achieved by apparatus including la storage bin having a discharge opening in the bottom portion thereof to `which the content-s will flow by gravity. A dumping door is movably mounted at the discharge opening and adapted to open and close said opening as it is actuated from one position to another. A suitable loading means such as a conveyor is provided for loading the storage Ibin and a door actuating means, such as a pneumatic cylinder, is provided for actuating the door from one position to another. The Istorage bin is mounted for vertical movement and is supported on a compressible n weight sensitive means which is actuated by the increasing weight of the storage bin as it is loaded. The weight sensitive means is :adapted to stop the loading means and energize the pneumatic cylinder to open the door and dump the bin when the contents of the bin reach a given weight.
The dumping door is actuated by a pneumatic cylinder land `a toggle actu-ating mechanism which includes a link member pivotally connected between the cylinder and the door and a pair of rigid arms pivotally connected between the link member and the side of the bin. The arms are mounted so that with the door in its fully closed position the pivot point between the link `and door will lie above (on the door closing side) of an imaginary lineV drawn between the pivot points of one 4of the rigid arms. With this arrangement the arms cooperate with the link to hold the door tightly in a closed position against the weight of the material in the bin with no forces acting on the parts tending to move them in the door opening direction. The door is pivotally mounted along the upper edge of the discharge opening so that the load being dumped will aid in opening the door and thereby substantially reduce the ycylinder size and air required for actuation of the toggle mechanism.
Other objects and advantages will be pointed out in, or be apparent from the specication and claims, as will obvious modifications of the two embodiments shown in the drawings, in which:
FIG. l is a side elevation of a loading apparatus embodying the invention;
FIG. 2 is a front elevation of the apparatus shown in FIG. l with a part of the dumping door broken away;
FIG. 3 is a sectional view taken along line 3 3 of FIG. 1;
FIG. 4 is a sectional View taken .along line 4 4 of FIG. 2;
FIG. 5 is a detailed View of the weight sensing load transducer used in the loading apparatus;
FIG. 6 is a side elevation (with parts broken away) of ICC `a loading apparatus showing a modification of the invention; and
FIG. 7 is a front elevation of the apparatus shown in FIG. 6 with a part of the dumping door broken away.
Referring to the drawings, the loading apparatus of this invention comprises a loading bin or pocket 10 which communicates with a skip 12 through an enclosed chute 14. In a mine installation for example, pocket 10 and chute 14 are installed in a concrete reinforced cavity 15 at the junction of a mine lateral and a vertical mine shaft in which skip 12 is hoisted and lowered on a wire rope 16.
The ore mined from the lateral is `dumped into the open top of pocket 10 by any suitable means such as a conveyor 18, as shown, or by dumping from cars or another `bin through power actuated gates. Pocket 10 has a bottom 19 which slopes to discharge opening 20` leading into chute 14. The slope of bottom 19 of the pocket is made substantially the same as the slope of chute 14 so that ore will flow smoothly from the pocket thnough the chute and into the skip. Flow from pocket 10 through discharge opening 20 is controlled by a `dumping door 22 plvotally mounted on opposite sides of pocket :10 by means of stub lshafts 24 as shown in FIG. 3.
Pocket 10 is slidably mounted for vertical movement by means of angles 26 (with ywear plates 28) mounted in cavity 15 at each corner of the upper end of the pocket (FIG. 4) which cooperate with angles 30 (with wear plates 31) welded to the pocket to guide its vertical movement. A pair of-guide members 33 (FIG. 2) mounted at the lower end of the pocket serve to guide its vertical movement in this area. The weight of the pocket and its contents is supported by a load transducer 32 mounted directly beneath the pocket 'as shown in FIG. l.
As .shown in detail in FIG. 5, transduced 32 includes a bearing plate 34 which receives the load through a pair of I-beams 36 fastened to the pocket 4and resting on the plate. The load is supported by a compressible C-shaped member 38 `housed in a casing 40. The load is transmitted to member 38 by means of a plunger 42 tted in a cavity 44 in the bottom of plate 34 and a ball 46 seated in sockets formed in the bottom of the plunger and the top of member 33. Plunger 42 is mounted in a flexible diaphragm 4S fastened to the top of casing 40 to seal the parts inside the casing.
` Thus, as pocket 10 is loaded by any suitable means suoh as a conveyor 18 as shown the pocket will move ldownwandly compressing member 38 as the weight eX- erted on the transducer is increased. When the weight of the pocket contents reaches a given amount, a precision switch 52 mounted on the top portion of C-mem ber 38 will tbe closed by a stationary stop 54 mounted on the bottom portion thereof. The closing of switch 52 can be arranged to stop conveyor 1S and energize a door actuating pneumatic cylinder 56 if a trip switch (not shown) located in the shaft has been actuated to sense Jche presence of a skip at the end of chute 14. Cylinder 56 is pivotally mounted on the front of pocket 10 by a pin 59, as shown, and has a piston (not shown) with a connecting rod `61 pivotally connected to door 22. Thus, when cylinder S6 is energized, door 22 will be swung [from )the solid line to the dotted line positions shown in FIG. 1 to thereby dump the ore in pocket 10 through opening 20 and chute `14 into skip 12.
As the pocket is dumped, the inherent resiliency of C-member 38 will raise the emptly pocket causing switch 52 to open. This, in turn, will deenergize cylinder 56 allowing door 22 to close by gravity. Conveyor l18 or other loading apparatus is again started to initiate the loading operation as skip 12 is being hoisted to the head frame tor dumping.
FIGS. 6 and 7 show a modification of the invention wherein a toggle mechanism S of novel design is utilized to open and close a dumping door 60 pivotally mounted along the upper edge or a discharge opening `62 of the loading `bin 64 by means of a rod 65. Toggle mechanism 53 is actuated to open and close door 6% by means of a pneumatic cylinder 66 having a piston rod 72. Cylinder -66 is pivotally mounted on the `front of bin 64 -by means of a bracket `67 and a pin 68. Mechanism 58 includes a link member 70 pivotally connected between brackets 74 Afastened to the underside of door 60 and the end of piston rod 72. Link member 70 bas a pair of arms 76 pivotally connecte-d to brackets 74 by pins 78 and a pair of arms 80 pivotally connected to the end of piston `rod '72 by a pin 82.
To impart an outward swinging motion to link 70 (and door 60) when cylinder 66 is energized, a pair of rigid arms 84 are provided. Arms 84 are pivotally mounted a-t .one end on the sides of bin 64 by pins 86 and at the other end to link '70 by pins 88. The iixed pivot points 86 of arms 84 are positioned so that when door 60 is in its fully closed position (as shown in solid lines in FIGS. 6 and 7) the pivots 78 between link 70 and door 60 will lie above (on the door closing side) of an imaginary line 90 drawn between `fixed pivot points 86 (between arms 84 and bin 64) and pivot points 88 (between the arms and link 70). Thus, it is seen that with door 60 in its fully closed position the force component (due to the weight 4oi the material in lthe bin) acting to pivot link 70 about pivots y88 is in a counterclockwise direction as viewed in FIG. `6. This force component is eifectively resisted by rigid arms 84 which cooperate with link 70 in the closed position to hold door 60 tightly in its closed position with no forces acting on the parts tending to move them inthe door opening direction.
To open door 60 and dump the contents of bin 64, cylinder 66 is energized to retract piston rod 72 upwardly into the cylinder. As the parts move from the closed position (solid lines, FIG. 6) to the open position (dotted lines, FIG. 6), mechanism 58 acts to very slowly open door 60 in its initial movement and thereafter very rapidly open the door in the later stages of the dumping action. This quick opening action, whereby the load being dumped aids in opening the door, reduces stresses on the pants and substantially reduces the cylinder size and air required for actuation .of the mechanism.
An enclosed chute 92 is provided to carry the material from the bin into a skip or other receptacle. Chute 92 is cut back as at 94 at its upper end to provide clearance for the movement of toggle mechanism 58, and door 60 is provided with vertical side skirts 96 which cooperate with the sides of chute 92 in the open position to prevent spillage over the sides of the chute.
Although two embodiments of the present invention ihave been illustrated and described, it will be apparent to .those skilled in the art that various changes and modilfcations of the invention may be made therein without departing from the spirit of the invention or from the scope of the appended claims.
I claim:
1. Apparatus for discharging the contents of a storage bin into a skip in a mine when -the contents reach a given weight, comprising, a bin, a discharge opening in the bottom portion of said bin through which the contents vvill W :by gravity, a dumping door pivotally mounted along the upper edge of said discharge opening and adapted to open and close said opening as it is actuated from ione position to another, actuating means including a pneumatic cylinder and a toggle mechanism for actuating said door, said pneumatic cylinder pivotally mounted on the iront of said bin above said dumping door, mounting means on the sides of said bin `to provide lateral support to said 'bin and lto permit its vertical movement, and Weight sensitive means supported and mounted centrally below said bin, said means being responsive to and resisting `the vertical movement of said bin as it is being loaded and adapted to enengize said door actuating means to open said door and dump said bin when the contents of said bin reach the given weight.
2. Apparatus according to claim l in which said toggle mechanism includes a link member pivotally connected to Ithe front lof said door and extending forwardly trom said door when said door is closed for pivotal connection to said pneumatic cylinder, and a Irigid arm pivotally mounted at a xed point on said bin to the rear of said door, and pivotally connected to said link near the end of the link which is pivotally connected to said pneumatic cylinder, said iixed pivotal mounting point for said rigid arm located so that when said door is in its bully closed position said pivotal connection between said door and said link will lie on the door closing side of an imaginary line drawn between said xed mounting point and the pivotal connection between said arm and said link.
3. Apparatus according to claim 1 in which said weight sensitive means includes a compressible C-shaped member on which said bin is supported, the two ends of which are forced together as said bin is loaded, a casing housing the said C-shaped member, and a diaphragm means sealing lche C-shaped member within said casing and transmitting the vertical movement of said bin.
References Cited in the le of this patent UNITED STATES PATENTS 1,094,904 Hughes Apr. 28, 1914 1,937,232 Kuehlin-g Nov. 28, 1933 1,970,291 Everhard Aug. 14, 1934 2,373,838 Lindholm Apr. 17, 1945 2,801,035 Hertrioh July 30, 1957 2,890,013 Schieser lune 9, 1959 2,930,227 Spademan et al. Mar. 29, 1960

Claims (1)

1. APPARATUS FOR DISCHARGING THE CONTENTS OF A STORAGE BIN INTO A SKIP IN A MINE WHEN THE CONTENTS REACH A GIVEN WEIGHT, COMPRISING, A BIN, A DISCHARGE OPENING IN THE BOTTOM PORTION OF SAID BIN THROUGH WHICH THE CONTENTS WILL FLOW BY GRAVITY, A DUMPING DOOR PIVOTALLY MOUNTED ALONG THE UPPER EDGE OF SAID DISCHARGE OPENING AND ADAPTED TO OPEN AND CLOSE SAID OPENING AS IT IS ACTUATED FROM ONE POSITION TO ANOTHER, ACTUATING MEANS INCLUDING A PNEUMATIC CYLINDER AND A TOGGLE MECHANISM FOR ACTUATING SAID DOOR, SADI PNEUMATIC CYLINDER PIVOTALLY MOUNTED ON THE FRONT OF SAID BIN ABOVE SAID DUMPING DOOR, MOUNTING MEANS ON THE SIDES OF SAID BIN TO PROVIDE LATERAL SUPPORT TO SAID BIN AND TO PERMIT ITS VERTICAL MOVEMENT, AND WEIGHT SENSITIVE MEANS SUPPORTED AND MOUNTED CENTRALLY BELOW SAID BIN, SAID MEANS BEING RESPONSIVE TO AND RESISTING THE VERTICAL MOVEMENT OF SAID BIN AS IT IS BEING LOADED AND ADAPTED TO ENERGIZE SAID DOOR ACTUATING MEANS TO OPEN SAID DOOR AND DUMP SAID BIN WHEN THE CONTENTS OF SAID BIN REACH THE GIVEN WEIGHT.
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416708A (en) * 1967-04-18 1968-12-17 William B Prichett Jr Weighing and dispensing apparatus
US3429782A (en) * 1965-10-21 1969-02-25 Nooter Corp Hydraulically operated bottom closure for a straining tank
US3578283A (en) * 1969-04-24 1971-05-11 Armstrong Jones Ltd Arcuate blade gate valve
US3901418A (en) * 1972-10-26 1975-08-26 United States Steel Corp Operating mechanism for slidable gates
US4085850A (en) * 1976-12-13 1978-04-25 Heltzel Carl J Single load cell weigh hopper system
US4226566A (en) * 1978-03-30 1980-10-07 Maust Gale E Beet harvesting machine
US4274784A (en) * 1979-05-31 1981-06-23 Whiting Corporation Cupola charging
US5667108A (en) * 1994-04-13 1997-09-16 Optima-Maschinenfabrik Dr. Buhler Gmbh & Co. Single valve dispensing balance
US5842649A (en) * 1997-06-26 1998-12-01 The Louis Berkman Company Precision placement spreader
US5890867A (en) * 1995-09-07 1999-04-06 The Louis Berkman Company Rotatable feedgate
US6220532B1 (en) 1999-12-21 2001-04-24 The Louis Berkman Company Mount and feeder arrangement for a precision placement spreader
US6361266B1 (en) 1995-09-07 2002-03-26 The Louis Berkman Company Rotatable feedgate

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1094904A (en) * 1912-12-13 1914-04-28 Howard R Hughes Well-drilling apparatus.
US1937232A (en) * 1932-02-19 1933-11-28 Barber Asphalt Co Hopper gate closing mechanism
US1970291A (en) * 1928-07-19 1934-08-14 Freyn Engineering Co Weighing and delivery mechanism
US2373838A (en) * 1940-04-04 1945-04-17 Pneumatic Scale Corp Automatic weighing machine
US2801035A (en) * 1953-09-17 1957-07-30 Western States Machine Co Power-operated loading gate for centrifugal machines
US2890013A (en) * 1955-12-16 1959-06-09 Nat Ind Product Company Net weighing machine
US2930227A (en) * 1956-07-09 1960-03-29 Toledo Scale Corp Load measuring device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1094904A (en) * 1912-12-13 1914-04-28 Howard R Hughes Well-drilling apparatus.
US1970291A (en) * 1928-07-19 1934-08-14 Freyn Engineering Co Weighing and delivery mechanism
US1937232A (en) * 1932-02-19 1933-11-28 Barber Asphalt Co Hopper gate closing mechanism
US2373838A (en) * 1940-04-04 1945-04-17 Pneumatic Scale Corp Automatic weighing machine
US2801035A (en) * 1953-09-17 1957-07-30 Western States Machine Co Power-operated loading gate for centrifugal machines
US2890013A (en) * 1955-12-16 1959-06-09 Nat Ind Product Company Net weighing machine
US2930227A (en) * 1956-07-09 1960-03-29 Toledo Scale Corp Load measuring device

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429782A (en) * 1965-10-21 1969-02-25 Nooter Corp Hydraulically operated bottom closure for a straining tank
US3416708A (en) * 1967-04-18 1968-12-17 William B Prichett Jr Weighing and dispensing apparatus
US3578283A (en) * 1969-04-24 1971-05-11 Armstrong Jones Ltd Arcuate blade gate valve
US3901418A (en) * 1972-10-26 1975-08-26 United States Steel Corp Operating mechanism for slidable gates
US4085850A (en) * 1976-12-13 1978-04-25 Heltzel Carl J Single load cell weigh hopper system
US4226566A (en) * 1978-03-30 1980-10-07 Maust Gale E Beet harvesting machine
US4274784A (en) * 1979-05-31 1981-06-23 Whiting Corporation Cupola charging
US5667108A (en) * 1994-04-13 1997-09-16 Optima-Maschinenfabrik Dr. Buhler Gmbh & Co. Single valve dispensing balance
US5890867A (en) * 1995-09-07 1999-04-06 The Louis Berkman Company Rotatable feedgate
US6361266B1 (en) 1995-09-07 2002-03-26 The Louis Berkman Company Rotatable feedgate
US5842649A (en) * 1997-06-26 1998-12-01 The Louis Berkman Company Precision placement spreader
US5947391A (en) * 1997-06-26 1999-09-07 The Louis Berkman Company Precision placement spreader
US6220532B1 (en) 1999-12-21 2001-04-24 The Louis Berkman Company Mount and feeder arrangement for a precision placement spreader
US6398137B1 (en) 1999-12-21 2002-06-04 The Louis Berkman Company Mount and feeder arrangement for a precision placement spreader

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