CA1055785A - Device for freeing rotation of a discharge control door for particulate material - Google Patents
Device for freeing rotation of a discharge control door for particulate materialInfo
- Publication number
- CA1055785A CA1055785A CA260,683A CA260683A CA1055785A CA 1055785 A CA1055785 A CA 1055785A CA 260683 A CA260683 A CA 260683A CA 1055785 A CA1055785 A CA 1055785A
- Authority
- CA
- Canada
- Prior art keywords
- discharge
- door
- opening
- rotation
- cam member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
TITLE
DEVICE FOR FREEING ROTATION OF A DISCHARGE
CONTROL DOOR FOR PARTICULATE MATERIAL
ABSTRACT OF THE DISCLOSURE
A device for freeing rotation of discharge control doors of the type described in U.S. Patents Nos. 3,654,872 and 3,822,650, due to compaction of fines on the top surface of the control doors which cover the discharge openings, is disclosed. The device lowers the control doors to increase the clearance between the terminating edges of the discharge openings and the top surface of the discharge door covering the openings, thereby reducing the friction between the com-pacted fines on the top surface of the door and the terminat-ing edges of the discharge openings, allowing the discharge doors to operate normally.
DEVICE FOR FREEING ROTATION OF A DISCHARGE
CONTROL DOOR FOR PARTICULATE MATERIAL
ABSTRACT OF THE DISCLOSURE
A device for freeing rotation of discharge control doors of the type described in U.S. Patents Nos. 3,654,872 and 3,822,650, due to compaction of fines on the top surface of the control doors which cover the discharge openings, is disclosed. The device lowers the control doors to increase the clearance between the terminating edges of the discharge openings and the top surface of the discharge door covering the openings, thereby reducing the friction between the com-pacted fines on the top surface of the door and the terminat-ing edges of the discharge openings, allowing the discharge doors to operate normally.
Description
$
~Cli~l~OUN~ OF r~ V~I~rl~Iol~
Fielci OL the i nVerltiOn ~ . .
rhis invention relates to a ~evice for freeiny ro~ation o~ disc}larc3e control ~oors conlrolling discharcJe of particulate ~na-terial from a con-ta:iner -therefor.
Prior ~rt Rela-ting to -the ~isclosure .. . . _ .. _ U.S. Patents Nos. 3,654,872 and 3,~2,6~0 describe ~ischarge control doors fitted onto railway hopper cars for discharging material, such as xailroad ballast, outside o:E or between the rails of railroad tracks. Under certain conditions, fines i.n the material being discharged becol,le cornpacted on the top arcuate surface of the discharge ~oors and make the doors difficult to rotate to the open or closed positions because of the increased pressure and bearing area o~ the coMpacted fines which increase the friction moment between the top surface or the doors and the terminating edges of the discharge openings.
This application is directed to means for alleviating this problem.
-It is a primary object of this invention to provide a device for freeing rotation of discharge control doors o~
the type described in U.S. Patents Nos. 3,654,872 and 3,$~2,650 when the doors resist rotation because of friction buildup between the terminating edges of the discharye openin-3s asso-ciated with the doors and the top arcuate surface of the dis-charge doorc~ coverlng the discharye openings in ~he closed position.
; It is a further object of ~his invention to provide a device which adjustably increases the clearanca between the discharge opening of a container holding a particula-te material ~and the suxface o~ a discharge door coveri.ng the di~charge opening for freeing rotation of the discharge door~
.
., . ~ -'; .
7~
It is a ~lrther object o~ this invention -to provide discharge control doors for controlling discharge of particu-late material from containers therefor wherein the discharge doors covering the discharge openings can be lowered relative to the discharge openings as necessary to increase the clear-anc~ between the terminating edges of the discharge openings and the top surfaces of the discharge control doors covering the openings to free rotation of the doors.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side elevational view of a hopper car of conventional design with the discharge openings thereof fitted with discharge control doors, Fig. 2 is a side elevational view of a discharge eontrol door including the device for freeing rotation and illustrating the positions to which the eontrol doors may be moved to free rotation thereof;
Fig. 3 is a front view of the diseharge control door of Fig. l; and Fig. 4 is a cross-seetion along line 4-4 of Fig. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Although the discharge control doors of this invention are deseribed for use with railroad hopper cars 1, as illus-trated in Fig. 1, the control doors can be fitted onto discharge vpenings of stationary containers holding particulate material or containers carried by other transportation means. Referring to Fig. 2, reference numeral 10 illustrates sloping extension plates which extend from the lower edges of longitudinal dis-eharge openings formed in the bottom wall of a eontainer or railroad hopper car. When used with conventional railroad hopper ears, generally two discharge openings are cut in the bottom wall of the hopper ear above eaeh rail. At each end
~Cli~l~OUN~ OF r~ V~I~rl~Iol~
Fielci OL the i nVerltiOn ~ . .
rhis invention relates to a ~evice for freeiny ro~ation o~ disc}larc3e control ~oors conlrolling discharcJe of particulate ~na-terial from a con-ta:iner -therefor.
Prior ~rt Rela-ting to -the ~isclosure .. . . _ .. _ U.S. Patents Nos. 3,654,872 and 3,~2,6~0 describe ~ischarge control doors fitted onto railway hopper cars for discharging material, such as xailroad ballast, outside o:E or between the rails of railroad tracks. Under certain conditions, fines i.n the material being discharged becol,le cornpacted on the top arcuate surface of the discharge ~oors and make the doors difficult to rotate to the open or closed positions because of the increased pressure and bearing area o~ the coMpacted fines which increase the friction moment between the top surface or the doors and the terminating edges of the discharge openings.
This application is directed to means for alleviating this problem.
-It is a primary object of this invention to provide a device for freeing rotation of discharge control doors o~
the type described in U.S. Patents Nos. 3,654,872 and 3,$~2,650 when the doors resist rotation because of friction buildup between the terminating edges of the discharye openin-3s asso-ciated with the doors and the top arcuate surface of the dis-charge doorc~ coverlng the discharye openings in ~he closed position.
; It is a further object of ~his invention to provide a device which adjustably increases the clearanca between the discharge opening of a container holding a particula-te material ~and the suxface o~ a discharge door coveri.ng the di~charge opening for freeing rotation of the discharge door~
.
., . ~ -'; .
7~
It is a ~lrther object o~ this invention -to provide discharge control doors for controlling discharge of particu-late material from containers therefor wherein the discharge doors covering the discharge openings can be lowered relative to the discharge openings as necessary to increase the clear-anc~ between the terminating edges of the discharge openings and the top surfaces of the discharge control doors covering the openings to free rotation of the doors.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side elevational view of a hopper car of conventional design with the discharge openings thereof fitted with discharge control doors, Fig. 2 is a side elevational view of a discharge eontrol door including the device for freeing rotation and illustrating the positions to which the eontrol doors may be moved to free rotation thereof;
Fig. 3 is a front view of the diseharge control door of Fig. l; and Fig. 4 is a cross-seetion along line 4-4 of Fig. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Although the discharge control doors of this invention are deseribed for use with railroad hopper cars 1, as illus-trated in Fig. 1, the control doors can be fitted onto discharge vpenings of stationary containers holding particulate material or containers carried by other transportation means. Referring to Fig. 2, reference numeral 10 illustrates sloping extension plates which extend from the lower edges of longitudinal dis-eharge openings formed in the bottom wall of a eontainer or railroad hopper car. When used with conventional railroad hopper ears, generally two discharge openings are cut in the bottom wall of the hopper ear above eaeh rail. At each end
-2-., . , , . ~ ~: : , 7~35 vf each of the discharge openings 11, pairs of supports 12 extend downwardly to provide support for the discharge control door assemblies 20. Each oF the supports 12 is sectioned into an upper portion 14 and a lower portion 16, the purpose of which will be described later in detail. Between each pair of supports 12, a discharge control door assembly 20 is pivotally mounted for rotation about a pivot axis 22.
The discharge control door assembly is best illustrated in Fig.
2, which illustrates an end view of one of the discharge control doors. Each discharge control door includes an arcuate top surface plate 24, the upper surface of which has a radius equal to the distance from pivot axis 22 to sub-stantially the lower terminating edges of the discharge opening formed by extension plates 1;0. The arcuate surface 24 extends the full length and width of the discharge opening 11 and covers the opening entirely, permitting no discharge of particulate material from the container when the door is in the normally closed position shown in Fig. 1.
Opposed, curved discharge plates 26 are secured to the underside ;
of the arcuate plate 24 and extend downwardly. Each of these plates is curved inwardly relative to the other, beginning at the point of attachment to arcuate plate 24, and then curved outwardly relative to one another. This design allows better flow of particulate material thereover and a wider opening between the plate and the terminating edges of the extension plates 10 when the discharge control door assembly is rotated to the open position. End plates 28 and 30 are secured to the ends of the discharge plates 26 and the arcuate surface 24. Each end plate extends beyond its intersection with each of the discharge plates 26 to form a chute which channels the material being di scharged.
Stub shaf~s 32 extend through and are secured to the ~''' '''' ,!~ . ., ' . .
end walls 28 and 30 o~ the discharge control door assemblles, as illustrated in Fig. 3. The ends of each of the shafts extend through openings and are supported for rotation in the respective lower portions 16 of the supports 12. The axes of shafts 32 are coinciden-t with pivot axis 22. When mounted on a railroad hopper car, the pivot axis for each of the discharge control door assemblies is preferably directly above its asso-ciated rail and in the same vertical plane. The discharge control door assemblies are mounted so that they will normally C~ remain in closed position, as illustrated in Fig. 2.
Attached to each of the discharge control door assemblies are actuating means permitting rotation of the control door assemblies clockwise or counterclockwise to the open position to allow discharge of material contained in the container out and down one of the chutes formed by the dis-charge plates 26 and end plates 28 and 30, depending on clock-wise or counterclockwise rotation. The actuating means is best seen in Figs. 2 and 3 and includes a hal*~moon plate 34 fixed to the end of shaft 32. ~alf-moon plate 34 includes one or more integrally attached annular sleeves 36 having openings therein of sufEicient size to receive a length of pipe or rod for manual rotation of the discharge control door assembly. The pla-te 34 also has opposed slots 38 cut therein to receive a latch 40 to lock the plate and discharge control door assembly against rotation when desired. The latch is pivotally supported for rotation at its upper end ~rom a latch support 42 e~tendi.ng outwardly from the upper portion 14 of support 12. ~ closed loop 4~ may be provided on the latch, as illustrated in Fig. 3, so as to allow easy unlocking of the discharge control door assembly for rotation.
An adjustable friction brake asse~bly 46 is provided to hold the discharge control doo~ assembly open to a predetermined set position. The friction brake is adjusted to exert a braking _~_ ~' .
force against the end plate of the door to e~ualize -the forces tending to move the door to its normally closed position. The friction brake includes a friction element (not shown) pressed against the end plate 28 of the discharge control door by a spring, the compression o~ which is adjusted by an adjustment screw sup-ported by and extending through the upper portion 14 of the support 12. The braking force exerted by the friction element against the end plate of the door assembly is adjusted -to equalize the forces tending to move the door assembly back to its normally closed po-/D sition. These forces include the weight of the door and counter-weight, if any, in the door, and the weight of the particulate material flowing over the discharge plate during discharge. The pressure of the friction element of the friction brake assembly against the end wall of the discharge control door assembly is adjustable so that the door, when moved to the open position to discharge particulate material, remains in the open position until a force exerted on the door returns the door to the closed position.
The gap between the terminating edges of the slope sheets or extensions 10 and the top surface of the arcuate member 24 is made adJustable by providing adjustable elements 48, each secured by a bolt and nut to each of the terminating edges o~ the slope sheets, as illustrated in phantom in Fig. 2.
When unloading certain particulate materials, the fines contained in the material tend to compact on surfaces of the con-tainer holding them, as well as on the top surfaces of each of the arcuate members 24 of each of the discharge doors. The increased pressure and bearing area of the compacted fines formed on the top sur~aces o the arcuate members increases the friction moment and resists opening of the doors. To alleviate this problem, a camming
The discharge control door assembly is best illustrated in Fig.
2, which illustrates an end view of one of the discharge control doors. Each discharge control door includes an arcuate top surface plate 24, the upper surface of which has a radius equal to the distance from pivot axis 22 to sub-stantially the lower terminating edges of the discharge opening formed by extension plates 1;0. The arcuate surface 24 extends the full length and width of the discharge opening 11 and covers the opening entirely, permitting no discharge of particulate material from the container when the door is in the normally closed position shown in Fig. 1.
Opposed, curved discharge plates 26 are secured to the underside ;
of the arcuate plate 24 and extend downwardly. Each of these plates is curved inwardly relative to the other, beginning at the point of attachment to arcuate plate 24, and then curved outwardly relative to one another. This design allows better flow of particulate material thereover and a wider opening between the plate and the terminating edges of the extension plates 10 when the discharge control door assembly is rotated to the open position. End plates 28 and 30 are secured to the ends of the discharge plates 26 and the arcuate surface 24. Each end plate extends beyond its intersection with each of the discharge plates 26 to form a chute which channels the material being di scharged.
Stub shaf~s 32 extend through and are secured to the ~''' '''' ,!~ . ., ' . .
end walls 28 and 30 o~ the discharge control door assemblles, as illustrated in Fig. 3. The ends of each of the shafts extend through openings and are supported for rotation in the respective lower portions 16 of the supports 12. The axes of shafts 32 are coinciden-t with pivot axis 22. When mounted on a railroad hopper car, the pivot axis for each of the discharge control door assemblies is preferably directly above its asso-ciated rail and in the same vertical plane. The discharge control door assemblies are mounted so that they will normally C~ remain in closed position, as illustrated in Fig. 2.
Attached to each of the discharge control door assemblies are actuating means permitting rotation of the control door assemblies clockwise or counterclockwise to the open position to allow discharge of material contained in the container out and down one of the chutes formed by the dis-charge plates 26 and end plates 28 and 30, depending on clock-wise or counterclockwise rotation. The actuating means is best seen in Figs. 2 and 3 and includes a hal*~moon plate 34 fixed to the end of shaft 32. ~alf-moon plate 34 includes one or more integrally attached annular sleeves 36 having openings therein of sufEicient size to receive a length of pipe or rod for manual rotation of the discharge control door assembly. The pla-te 34 also has opposed slots 38 cut therein to receive a latch 40 to lock the plate and discharge control door assembly against rotation when desired. The latch is pivotally supported for rotation at its upper end ~rom a latch support 42 e~tendi.ng outwardly from the upper portion 14 of support 12. ~ closed loop 4~ may be provided on the latch, as illustrated in Fig. 3, so as to allow easy unlocking of the discharge control door assembly for rotation.
An adjustable friction brake asse~bly 46 is provided to hold the discharge control doo~ assembly open to a predetermined set position. The friction brake is adjusted to exert a braking _~_ ~' .
force against the end plate of the door to e~ualize -the forces tending to move the door to its normally closed position. The friction brake includes a friction element (not shown) pressed against the end plate 28 of the discharge control door by a spring, the compression o~ which is adjusted by an adjustment screw sup-ported by and extending through the upper portion 14 of the support 12. The braking force exerted by the friction element against the end plate of the door assembly is adjusted -to equalize the forces tending to move the door assembly back to its normally closed po-/D sition. These forces include the weight of the door and counter-weight, if any, in the door, and the weight of the particulate material flowing over the discharge plate during discharge. The pressure of the friction element of the friction brake assembly against the end wall of the discharge control door assembly is adjustable so that the door, when moved to the open position to discharge particulate material, remains in the open position until a force exerted on the door returns the door to the closed position.
The gap between the terminating edges of the slope sheets or extensions 10 and the top surface of the arcuate member 24 is made adJustable by providing adjustable elements 48, each secured by a bolt and nut to each of the terminating edges o~ the slope sheets, as illustrated in phantom in Fig. 2.
When unloading certain particulate materials, the fines contained in the material tend to compact on surfaces of the con-tainer holding them, as well as on the top surfaces of each of the arcuate members 24 of each of the discharge doors. The increased pressure and bearing area of the compacted fines formed on the top sur~aces o the arcuate members increases the friction moment and resists opening of the doors. To alleviate this problem, a camming
3~ device is providecl to lower the discharge control door assembly and increase the clearance or gap between the terminating edges of the discharge opening and the top surface of the arcuate member 24, thereby reducing the ~ . ~
f~iCtiOII an~ allor~ing -th~ door to o~n as it slloul(l. To accomplisll this, ~he suppor-t L~lates 12 for the disc~larye control door asselnbly are separated illto two ~ortlons, all upper portion 1~ and a lower por tiGn 16 ~ The lower -~ortion is connected at one end to the u~per portion by a hil~(Je asse~
bly 50 s~cured to the upper portion 14 and supportirl~ tlle lower portion 16 by means of a pin 52 e~tending througll the hinge assembly and 10~.7er portion 1~ of support 12. The opposite side of the lower portion lG is swppor-ted hy a cam head S~ having a slot 58 therein, as illustrated in Fig~ 2. The cam hea~ 5 is co~nected to the lower plate 16 by pin 62, whicil exten~s throucJIl the lower plate 16. The cam heaci is connected to the upper plate ~y pin 60, whic11 e~tends throuyh the upper plate, the upper pin riding in the slot 5~. ~ach o the pillS 60 and 62 is equipped witll steel bushinys 64 and 66, as illus-traced in Fig. 4r ~ han~le 68 is connected -to the cam head 56 as illustrated. Lock washers 70 retain the pins in place. As the car~ head is rotated frolll the position shown in E`iy. 1 to the position illustrated in phantom in Fig. 1, the distance between the pivot pin 60 and -the support pin 62 increases, allo~ing the lower plate ko drop in relation to the upper plate 12 on that side. This is due to the eccentric slot 5~
whose distance rora the a~is o pin 62 varies rola one end o the slot to the other. The other gi~e o the plate 16 is restrained by the hinge so that -the net effect is a movelllent of the door asser~ly in a yenerally ~ownward dir~ction. This increases the clearclnce betwe2n the to~ surface of arcuate member 2~ an~ the terminakiny edges of the discllarge opening to allow normal rotation of the d~or to the open or close~
positions, as may be c~esired.
:
.i :. . . .. .. .... . . . .
f~iCtiOII an~ allor~ing -th~ door to o~n as it slloul(l. To accomplisll this, ~he suppor-t L~lates 12 for the disc~larye control door asselnbly are separated illto two ~ortlons, all upper portion 1~ and a lower por tiGn 16 ~ The lower -~ortion is connected at one end to the u~per portion by a hil~(Je asse~
bly 50 s~cured to the upper portion 14 and supportirl~ tlle lower portion 16 by means of a pin 52 e~tending througll the hinge assembly and 10~.7er portion 1~ of support 12. The opposite side of the lower portion lG is swppor-ted hy a cam head S~ having a slot 58 therein, as illustrated in Fig~ 2. The cam hea~ 5 is co~nected to the lower plate 16 by pin 62, whicil exten~s throucJIl the lower plate 16. The cam heaci is connected to the upper plate ~y pin 60, whic11 e~tends throuyh the upper plate, the upper pin riding in the slot 5~. ~ach o the pillS 60 and 62 is equipped witll steel bushinys 64 and 66, as illus-traced in Fig. 4r ~ han~le 68 is connected -to the cam head 56 as illustrated. Lock washers 70 retain the pins in place. As the car~ head is rotated frolll the position shown in E`iy. 1 to the position illustrated in phantom in Fig. 1, the distance between the pivot pin 60 and -the support pin 62 increases, allo~ing the lower plate ko drop in relation to the upper plate 12 on that side. This is due to the eccentric slot 5~
whose distance rora the a~is o pin 62 varies rola one end o the slot to the other. The other gi~e o the plate 16 is restrained by the hinge so that -the net effect is a movelllent of the door asser~ly in a yenerally ~ownward dir~ction. This increases the clearclnce betwe2n the to~ surface of arcuate member 2~ an~ the terminakiny edges of the discllarge opening to allow normal rotation of the d~or to the open or close~
positions, as may be c~esired.
:
.i :. . . .. .. .... . . . .
Claims (3)
1. Discharge control apparatus for controlling the discharge of particulate material from a container therefor, including a control door assembly and means providing a discharge opening, the assembly comprising a control door pivotally mounted beneath the opening by support plates rotatable between a closed position in which a surface of the door covers the opening an an open position, each support plate extending from a respective end of the opening and being divided into an upper portion and a lower portion with the lower portion connected to the upper portion by camming means, including a cam member, which camming means are operable to allow the lower portion to drop in relation to the upper portion as the cam member is rotated, thereby increasing the clearance between the surface of the door and the edges of the opening to prevent jamming of the door as it is rotated.
2. The apparatus of claim 1 wherein the support plates are parallel to each other and extend downwardly from opposite sides of the discharge opening, and wherein the door is supported by the lower portions of the support plates and is pivoted about an axis parallel to the length of and beneath the opening, and in its open position uncovers the opening by an amount dependent on the degree of rotation from the closed position.
3. The apparatus of claim 1 wherein the camming means includes pins extending in direct opposed relationship through the upper and lower portions of the support plates, the cam member secured to one of the portions by one of the pins and supported by the pin for rotation, the cam member having a slot therein eccentric with reference to the axis of the supporting pin, the other pin riding in the slot so that rotation of the cam member causes the distance between the supporting pin and the other pin to increase, thereby allowing the lower portion to drop in relation to the upper portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA260,683A CA1055785A (en) | 1976-09-07 | 1976-09-07 | Device for freeing rotation of a discharge control door for particulate material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA260,683A CA1055785A (en) | 1976-09-07 | 1976-09-07 | Device for freeing rotation of a discharge control door for particulate material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1055785A true CA1055785A (en) | 1979-06-05 |
Family
ID=4106803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA260,683A Expired CA1055785A (en) | 1976-09-07 | 1976-09-07 | Device for freeing rotation of a discharge control door for particulate material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1055785A (en) |
-
1976
- 1976-09-07 CA CA260,683A patent/CA1055785A/en not_active Expired
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