U.S. patent application number 09/863510 was filed with the patent office on 2001-09-27 for hopper car outlet gate valve.
This patent application is currently assigned to Salco Products, Inc.. Invention is credited to Burian, William F., Crouse, Andrew C., Degutis, Alex V., Stevenson, Daniel T..
Application Number | 20010023650 09/863510 |
Document ID | / |
Family ID | 23170174 |
Filed Date | 2001-09-27 |
United States Patent
Application |
20010023650 |
Kind Code |
A1 |
Burian, William F. ; et
al. |
September 27, 2001 |
Hopper car outlet gate valve
Abstract
A pneumatic outlet gate of a railroad hopper car has an valve
member mounted for rotation in a discharge tube between open and
closed positions. The valve member is an arcuate segment
terminating laterally at edge faces. The edge faces are angled such
that in the upper half of the discharge tube they always slant
downwardly from the surface of the tube, while in the lower half of
the discharge tube the edge faces face downwardly. An arrangement
of stops and abutments prevents rotation of the valve member to a
location where the edge faces could trap lading against the
discharge tube. Accordingly, the edge faces are self-emptying.
Inventors: |
Burian, William F.; (Downers
Grove, IL) ; Crouse, Andrew C.; (Lisle, IL) ;
Stevenson, Daniel T.; (Baytown, TX) ; Degutis, Alex
V.; (East Chicago, IN) |
Correspondence
Address: |
Wood Phillips Van Santen
Clark & Mortimer
Suite 3800
500 West Madison Street
Chicago
IL
60661-2511
US
|
Assignee: |
Salco Products, Inc.
|
Family ID: |
23170174 |
Appl. No.: |
09/863510 |
Filed: |
May 23, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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09863510 |
May 23, 2001 |
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09303008 |
Apr 30, 1999 |
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6263802 |
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Current U.S.
Class: |
105/280 ;
105/247 |
Current CPC
Class: |
B65G 53/4633 20130101;
B65D 90/545 20130101; B60P 1/56 20130101; B65D 90/582 20130101 |
Class at
Publication: |
105/280 ;
105/247 |
International
Class: |
B61D 003/00 |
Claims
1. An outlet gate for a railroad hopper car, comprising: first and
second slope sheets having spaced lower edges defining a discharge
opening; first and second end walls connected to the slope sheets;
a discharge tube attached to the slope sheets near the lower edges
for receiving lading from the discharge opening; a valve member
disposed in the discharge tube and having end portions mounted for
rotation in the end walls between a closed position in which the
valve member blocks the discharge opening and an open position in
which flow is permitted through at least a portion of the discharge
opening, the valve member comprising an arcuate segment bounded by
edge faces; at least one stop connected to one of the end wall or
valve member; and at least one abutment connected to the other of
the end wall or valve member, the stop and abutment being and
engageable with one another to limit rotation of the valve member,
the angle of the edge faces and the stop and abutment being
arranged such that all edge faces are self-emptying.
2. The outlet gate of claim 1 wherein the discharge tube has a
generally circular cross section and the stop and abutment are
arranged to prevent any part of the valve member from straddling
bottom dead center of the discharge tube.
3. The outlet gate of claim 1 wherein the valve member comprises: a
central backbone of an arc large enough to allow the backbone to
fully block the discharge opening when the backbone is centered on
said opening; first and second lateral wings attached to opposite
sides of the backbone and extending from opposite end portions
partially toward the other end portion such that each wing will
block one side of the discharge opening when the backbone has been
rotated to open the other side of said opening.
4. The outlet gate of claim 3 wherein the first and second wings
overlap intermediate the end portions of the valve member.
5. The outlet gate of claim 3 wherein the backbone has a
strengthening rib on one side thereof.
6. The outlet gate of claim 3 wherein each wing has a strengthening
rib on one side thereof.
7. The outlet gate of claim 1 wherein the abutment comprises a
bracket attached to the end wall.
8. The outlet gate of claim 7 wherein the stop comprises a set
screw connected to the valve member and extending sufficiently
therefrom to be engageable with the bracket.
9. The outlet gate of claim 1 further comprising an end adaptor
connected to each end portion of the valve member, and wherein the
abutment is fastened to the end wall on one side of the end
adaptor, and the stop is mounted on at least one end adaptor and
extends sufficiently therefrom to be engageable with the
abutment.
10. The outlet gate of claim 9 further comprising a second abutment
fastened to the end wall on the other side of the end adaptor, an
outlet cap removably mounted on the end adaptor, and pivot arms
connected to the abutments, the pivot arms being connectable to the
outlet cap to releasably retain it on the end adaptor.
11. In an outlet gate for a railroad hopper car of the type
comprising first and second slope sheets having spaced lower edges
defining a discharge opening, first and second end walls connected
to the slope sheets, a generally cylindrical discharge tube
attached to the slope sheets near the lower edges for receiving
lading from the discharge opening, a valve member disposed in the
discharge tube and having end portions mounted for rotation in the
end walls between a closed position in which the valve member
blocks the discharge opening and an open position in which flow is
permitted through at least a portion of the discharge opening, the
valve member comprising an arcuate segment bounded by edge faces,
the improvement comprising: at least one stop connected to one of
the end wall or valve member; and at least one abutment connected
to the other of the end wall or valve member, the stop and abutment
being and engageable with one another to prevent any part of the
valve member from straddling bottom dead center of the discharge
tube.
Description
BACKGROUND OF THE INVENTION
[0001] This invention relates to railroad hopper cars and
particularly to a pneumatic outlet gate therefor. Hopper car outlet
gates are located on the bottom of the car body. They include
slanted bottom walls known as slope sheets. The slope sheets are
bounded by end walls. The slope sheets have a gap between them at
their lower edges forming a discharge opening. Beneath this opening
there is attached a circular discharge tube with an arcuate valve
member in it. The discharge tube extends through end walls where it
can be connected to vacuum hoses for unloading purposes. The valve
member is mounted for rotation in the end walls. The valve can be
rotated between open and closed positions where it alternately
permits or blocks flow of granular materials through the discharge
opening and into the discharge tube. Outlet gates of this general
type are exemplified by U.S. Pat. No. 3,778,114, the disclosure of
which is incorporated by reference.
[0002] Hopper cars are used to transport granular products such as
grain, sugar, and plastic pellets. Small amounts of such materials
have a tendency to get stuck or caught in a car rather than flow
out during unloading. Any corner or crevice becomes a trap for
small grains or pellets. The outlet gate valve is a particularly
likely place for individual grains to get trapped between the
movable valve member and the discharge tube. This leads to the ever
present problem in hopper car operations of cleaning a car of all
remnants of a load before filling it with a new load. If any such
remnants are present, they contaminate the new load. This cannot be
tolerated.
[0003] While the car compartments have been designed to eliminate
corners, ledges or joints where granular materials can become
trapped, the outlet gate has been a continuing source of difficulty
in assuring complete removal of lading. As mentioned above,
remnants of a load tend to get trapped or wedged between the
arcuate valve member and the discharge tube. This occurs because
the lateral or side edges of the open valve member are permitted to
take up a position where, together with the internal wall of the
discharge tube, they form a small receptacle which is, in essence,
concave upwardly. Lading naturally gets caught in this receptacle.
If only a small amount of lading is so trapped it may be possible
to crush or pulverize the particles upon subsequent closing of the
valve. However, just because it is possible to close the valve does
not mean the discharge tube is clean. Further, it sometimes happens
that so much material is caught that the valve seizes and cannot be
closed.
[0004] The prior art solution is to disassemble the outlet gate
valve upon every unloading. With the valve element removed the
discharge tube can be vacuumed out and inspected to assure total
removal of all material. While this method is serviceable if
performed correctly, the cost in labor and time is significant.
What is needed is an outlet gate that can be totally cleaned
without having to remove the valve member from the discharge
tube.
SUMMARY OF THE INVENTION
[0005] The present invention is directed to an improved railway
hopper car outlet gate. The gate has the usual slope sheet and end
walls defining a discharge opening. A discharge tube attached to
the slope sheets receives material as it flows through the
discharge opening. The opening can be open and closed by a valve
member which is an arcuate segment mounted concentrically in the
discharge tube. The valve member is arranged to prevent formation
of concave upward receptacles between the edge faces of the valve
member and the inside wall of the discharge tube. This is done by
proper selection of the angle of the valve member's edge faces and
by a stop arrangement that prevents rotation of the valve member to
an orientation that would create such receptacles.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is an exploded perspective view of one end of the
outlet gate of the present invention, with some parts not shown to
reveal others.
[0007] FIG. 2 is a longitudinal section through an end portion of
the outlet gate.
[0008] FIG. 3 is a side elevation view of the valve member of the
present invention.
[0009] FIG. 4 is a bottom plan view of the valve member of the
present invention.
[0010] FIG. 5 is a transverse section through the discharge tube
and valve member, taken at the location of line 5-5 of FIG. 4.
[0011] FIG. 6 is a section similar to FIG. 5, taken along line 6-6
of FIG. 4.
[0012] FIG. 7 is a section similar to FIG. 5, taken along line 7-7
of FIG. 4.
[0013] FIG. 8 is a transverse section through the discharge tube
and valve member of a prior art discharge valve.
[0014] FIG. 9 is an enlargement of the area encircled in FIG.
8.
[0015] FIG. 10 is a section similar to FIG. 5, showing the valve
member rotated to a full open position.
DETAILED DESCRIPTION OF THE INVENTION
[0016] FIGS. 1 and 2 illustrate one end of the outlet gate 10 of
the present invention. It will be understood that the parts shown
in FIGS. 1 and 2 are duplicated on the other end of the gate. The
gate has an upper circumferential flange 12 (FIG. 2) which permits
attachment of the gate to a car body indicated generally at 14. The
car body has a flange 16 around its lower edge. A gasket 18 is
positioned between flanges 12 and 16. The flanges are suitably
fastened together by nuts and bolts (not shown). The outlet gate 10
includes a pair of slope sheets 20 which slope downwardly and
terminate at spaced apart lips 22, one of which can be seen in FIG.
2. The lips define a discharge opening between them. A discharge
tube 24 is attached to the underside of the slope sheets and
generally surrounds the discharge opening. The discharge tube is
substantially cylindrical and extends transversely to the length of
the car, i.e., transversely to the tracks on which the car sits.
All of the foregoing construction is conventional.
[0017] A pair of end walls 26 are connected to the ends of the
slope sheets 20. The discharge tube 24 extends to each end wall 26
in communication with a hole 27 in each wall 26. Fixed to the
exterior of each end wall 26 and surrounding the hole 27 is an end
ring 28. The bottom, inner surface 30 of the end ring 28 is flush
with the bottom of the hole 27 and the bottom of the discharge tube
24 to form a smooth continuation of the discharge tube. An end
adapter 32 is mounted for rotation on a bearing or wear pad 34
which surrounds the exterior of the end ring 28. A U-cup gasket or
wiper 35 surrounds the end ring 28 to prevent entry of dirt or dust
between the end ring and bearing.
[0018] The outer periphery of the end adapter 32 has a
circumferential rim 36 with an interior groove 38 formed therein.
The groove receives a fitting or sleeve 40 to which a pneumatic
hose or the like (not shown) may be connected for the pneumatic
discharge of the lading from the car. A gasket 42 is positioned on
the outer face of the rim 36. A removable end cap generally
indicated at 44 may be positioned over the sleeve 40 adjacent the
gasket 42. The cap has a pair of extensions or ears 46 (FIG. 1) on
either side thereof. Each ear has a bore 48 therethrough which
opens to the side through a slot 50.
[0019] The cap 44 is releasably secured in a closed position by a
pair of eye bolts 52. The shanks of the eye bolts are threaded into
holes in the end of pivot arms 54. The pivot arms include a clevis
which is pivotally connected by bolts 56 and nuts 57 to brackets
58. The brackets 58 are fastened to the end wall 26 by counter sunk
bolts 60 and lock nuts 62. The brackets have cantilevered arms or
abutments 59 with openings therein which receive the bolts 56. To
remove the cap 44, the eye bolts 52 are loosened by unscrewing them
from the pivot arms 54. Once the heads of the eye bolts are clear
of the ears 46, the pivot arms 54 are rotated outwardly so that the
shanks of the eye bolts slide through the slots 50 in the ears 46.
This releases the cap for removal from the sleeve 40. To secure the
cap, this process is reversed.
[0020] Rotation of the end adapter 32 is effected by a handle
assembly 63. The assembly includes a pair of handles 64 joined to a
band 65 which wraps around the top of the adapter 32. The handles
64 and band 65 are preferably formed in a single casting. The
handle assembly is completed by a strap 66 which wraps around the
bottom side of the adapter 32. The strap 66 is fastened to the
handle/band casting by bolts 67. The handles 64 are located beneath
the pivot arms 54 when the arms are in position to secure the cap
44. In order to effect rotation of the end adapter, the pivot arms
54 have to be swung out of the way. When the arms are situated
generally parallel to the end plate 26, the handles 64 will clear
the foremost end of the arms 59 and allow the handles to turn the
end adapter 32. Rotation of the end adapter and valve member is
limited by a stop and two abutments. In the illustrated embodiment
the stop is in the form of a set screw 68 and the abutments are the
horizontal arms 59 of the brackets 58. The set screw is threaded
into a socket 70 near the end of the adapter 32. The set screw 68
extends from the adapter far enough so that the screw will not
clear the abutments 59 on either side of adapter. The abutments 59
are so located to limit rotation of the adapter to approximately
180 degrees.
[0021] A valve member shown generally at 72 in FIGS. 1 and 2 is
mounted for rotation within the discharge tube 24. The valve member
has two end portions 74 each of which extends through the end wall
opening 27 and end ring 28 and into the interior of the adapter 32.
A pair of bolts 76 in bores 78 in each end adapter engage the
adjacent end portion 74 of the valve member. The bolts 76 connect
the valve member 72 to the end adapter 32 such that the valve
member rotates with the end adapter.
[0022] Details of the valve member 72 are shown in FIGS. 3-7. The
valve member is an elongated part stretching from one end adaptor
to the other. FIG. 7 shows that in cross section the valve member
is an arcuate segment of 180 degrees on its outside diameter. It
has a backbone 80 which runs the full length of the valve member.
The backbone extends arcuately for the middle 70 degrees of the
arcuate segment, that is, 35 degrees on either side of the top
center when the valve is positioned as in FIGS. 5-7. A longitudinal
reinforcing rib 82 is formed on the underside of the backbone. The
rib strengthens the valve member.
[0023] A first wing 84 extends arcuately from the backbone. The
wing is integrally formed with the backbone. The junction of the
backbone and wing is along an imaginary line. The wing extends
arcuately from that imaginary line 55 degrees to a free edge where
it terminates laterally at an edge face 86. Longitudinally the wing
terminates at an end face 88 (FIG. 4). The underside of the wing 84
has a protrusion 90 running along its length. Like the rib 82,
protrusion 90 is for strengthening purposes. The wing 84 extends
longitudinally from one end portion 74 somewhat greater than half
the length of the valve member. Thus, wing 84 terminates at 88,
leaving an edge face 92 of the backbone exposed for much of the
remaining length of the valve member.
[0024] On the side of the backbone opposite the first wing 84 is a
second wing 94. This wing is similar to the first wing in that it
is integrally formed with the backbone and has a 55 degree arcuate
extent, terminating laterally at edge face 96. The second wing 94
extends longitudinally somewhat more than half of the length of the
valve member, terminating at 98 and leaving an exposed edge face
100 of the backbone. There is a protrusion 102 on the underside of
wing 94. It can be seen that the two wings 84 and 94 overlap
somewhat in the center of the valve member. In a sense, the edge
faces 92 and 100 define gaps or recessed areas or discharge
channels in the valve member and it is through these gaps that the
lading will flow when the valve is rotated out of the closed
position.
[0025] As mentioned above the valve member 72 is an arcuate segment
in cross section. It has an outside diameter only slightly less
than the inside diameter of the discharge tube. The valve member is
concentrically mounted in the discharge tube and extends through
the openings 27 in the end wall. The outside diameter of the valve
has a minimal clearance from the lips 22. FIG. 8 illustrates a
section through the discharge tube and valve member of a prior art
construction. The discharge tube defines four quadrants labeled I,
II, III and IV. The valve member 106 has an edge face 108 in one of
the two upper quadrants and an edge face 110 in the third quadrant,
one of the two lower quadrants. The edge face 110 faces upwardly.
That is, a line normal to and away from the face at the outside
diameter has a component above horizontal, as seen in FIG. 9. This
location and angle of the edge face, together with the inside wall
of the discharge tube forms a receptacle in which a piece of lading
can become entrapped. This receptacle is generally concave upwardly
as illustrated at 112 in FIG. 8. Thus, the prior art arrangement of
FIG. 8 permits a situation where lading can become trapped between
the valve member and the discharge tube.
[0026] The present invention is arranged such that none of the
valve member's edge faces 86, 92, 96 and 100 will trap lading in
the fashion shown in FIG. 8. All of the edge faces of the present
invention are self-emptying. By self-emptying it is meant that all
of the edge faces in the bottom two quadrants, III and IV, must
face down and any edge face in the top two quadrants, I and II,
must slant down from the outside diameter of the face to the inside
diameter of the face. By face down it is meant that a line
extending away from the edge face at the outside diameter and
normal thereto is either horizontal or has a vertical component
which is below horizontal.
[0027] The stop and abutments (in this case the set screw 68 and
the bracket arms 59) limit rotation of the valve member so that the
self-emptying condition of the edge faces is maintained. By
limiting the rotation to approximately 90 degrees in either
direction from the fully closed condition, it is assured that all
edge faces in the bottom half are facing downwardly and all edge
faces in the top half slant down from the outside to the inside. It
can be seen that if any part of the valve member extends across the
boundary between quadrants III and IV (which might also be
considered bottom dead center of the discharge tube), it will not
be possible to make an edge face in quadrants III and IV
self-emptying. Accordingly, this condition must be avoided.
[0028] The use, operation and function of the valve are as follows.
The valve member is initially in the position of FIGS. 5, 6 and 7,
in which the backbone of the valve fully closes the discharge
opening. The stop 68 is located along the vertical center line at
this time. To unload the car both of the caps 44 are removed and
the pivot arms 54 are swung out of the way of the handles 64.
Appropriate vacuum hoses are attached to one or both of the sleeves
40, as desired. To take a sample of the lading, the handles 64 are
rotated. A rotation of 10 degrees clockwise from the starting
position of FIG. 5 will open a small portion of the near side of
the valve. That is, considering the operator to be stationed at the
right end of the valve as seen in FIG. 3, a clockwise rotation will
move the edge face 100 opposite the discharge opening between the
slope sheets, opening a slight gap between a lip 22 and edge face
100 through which lading will fall into the discharge tube. A
counterclockwise rotation would similarly provide a little bit of
an opening on the far side of the valve as edge face 92 clears the
other slope sheet lip. Rotation of about 35 degrees from the
starting position will produce about 50% open. Again, rotation
clockwise opens the near side valve while counterclockwise rotation
opens the far side. A 63 degree rotation from the starting position
will provide 100% open, again on near side or far side depending on
the direction of rotation. Approximately 90 degree rotation
provides full clean out wherein one side is fully open and the
opposite side is partially open.
[0029] At 90 degrees rotation the stop 68 hits one of the abutments
59, preventing further rotation in that direction. The valve member
would be 90 degrees from the positions shown in FIGS. 5-7. Consider
an example where the rotation was 90 degrees clockwise from FIGS.
5-7. This is shown in FIG. 10. In this condition the wing edge face
96 is vertical (on the boundary of quadrants I and II) and thus
slants down from the outside to the inside diameter. Backbone edge
face 100 is in quadrant II and also slants down from outside to
inside. Backbone edge face 92 is in quadrant III and faces down.
Wing edge face 86 is nearly vertical, approximately on the boundary
of quadrants III and IV. Accordingly, all of the edge faces of the
valve member in the discharge tube are self-emptying. Any lading
particles, pellets or grains in the discharge tube will fall to the
bottom of the tube. The valve member does not present any edges
where the particles can become trapped or hung up. This allows the
discharge tube to be cleaned out by flushing it out with water.
Disassembly of the outlet gate is not required.
[0030] While a preferred form of the invention has been shown and
described, it will be realized that alterations and modifications
may be made thereto without departing from the scope of the
following claims. For example, the stop could be relocated to be
fixed to the end wall while the two abutments are movable with the
adaptor. Further, the stop could be other than a set screw, e.g.,
it could be a drive pin or the like. Also, the arcuate extent of
the backbone and wings could be other than as shown, depending on
the size of the discharge opening and the desired discharge gaps or
channels.
* * * * *