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Патент USA US3082713

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March 26, 1963
3,082,703
G, B. DoREY
summe cLosuRE ouTLET FRAME:V ASSEMBLY
Filed June 6. 1958
5 Sheets-Sheet 1
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March 26; 1963
3,082,703
G. B. DoRl-:Y
summa cLosURE OUTLET FRAME „ASSEMBLY
Filed June 6, 1958
3 Sheets-Sheet 2
March 26, 1963
G. B. DoR'EY
3,082,703
SLIDING cLosURE OUTLET FRAME ASSEMBLY
Filed June 6, 1958
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5 Sheets-Sheet 5
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United States Patent O
1C
ICC
3,082,703
George B. Dorey, Westmount, Quebec, Canada, assigner
to Enterprise Railway Equipment Company, Chicago,
lil., a corporation of Illinois
Filed .lune 6, 1958, Ser. No. 740,238
11 Claims. (Cl. 10S-282)
31,082,763
2
l
SLIEHNG CLÜSURE GUTLET FRAME ASSEMBLY
_
Patented Mar. 26, 1963
18 which is longitudinally movable in a framing struc
ture 19. The framing structure 19, which is welded to
the hopper'lZ, includes an upper section formed of lon
gitudinally extending members 20 and 21 transversely
spaced to accommodate the gate 18 therebetween and
transversely extending members 22 and 23.
The longitudinal members 20 and 21 are of angular
shape of rolled structural steel each with one flange
underlying the gate 1S as indicated at 24 for member 20
This invention relates to an improved means for operat
ing the sliding gate of a discharge outlet and relates more 10 and at 25 for member 21. The adjacent flanges ofthe
angle members 2t) and 21 extend upwardly as indicated
particularly to that type of outlet structure widely em
at y2t? and 27 to overlie the inner and outer walls 13 and
ployed for controlling the discharge of lading from rail
14. The ilange :27 being bent to present an inclined
way hopper cars. It constitutes an improvementover
section »28 conforming to the slope of the outer hopper
the constructions shown in U.S. Patent No. 2,753,815,
issued July `lt), 1956, and application Serial No. 534,547, 15 wall 14. The angle members 2t) and 21 extend longitu
dinally beyond the discharge opening 17, as indicated at
illed September 15, 1955, now abandoned.
120’ and 21’, to provide supporting ways for the gate 1S
The objects of the invention, among others, are: To
provide an improved mechanism for operating a sliding
in open position.
The transversely extending member 22, in like manner
traveling therewith wherein the shaft performs the double 20 to member 2t), includes a horizontally extending flange
29 aligned with flanges 24 and 25 which are united there
function of moving the gate and also acting as a guide
with by welded joints 3i) and 31. The flange that is
element to prevent canting of the gate as force is exerted
angularly related to flange 29 extends vertically upwardly,
to rotate the shaft; to provide improved toothed racks
as at ‘132, and thence upwardly at an incline, as at 33, to
for cooperating engagement with geared pinions Vnon
conform to the slope of sloping floor 15. The upwardly
rotatably mounted on the shaft; and to provide improved
extending flange portions 32 and 33 are welded at 34 and
means for simultaneously locking the shaft and gate
gate by rotation of a shaft journaled on the gate and
35 to the ends of the members 2.0 and 21. The other
transversely extending member 23 is of angular shape
The invention further resides in the arrangement of
with ilanges 36 and 37 and is inverted to present a trans
parts and details of construction such as will he described.
The improved structure is shown as applied to the 30 versely extending hood welded at each end to the longitu
dinal members 20 and 21 as indicated at 38 and 39.
hopper of a railway hopper car wherein the gate is moved
The members 22 and 23 preferably are rolled structural
from a location adjacent the side of the car by means
steel members.
of a removable bar extending at an angle to the shaft
Below the upper framing structure 19 there is dis
and therefore necessitating the application of operating
force at an appreciable distance from the gate. The ap 35 posed a depending chute like enclosure 40; which is lo
cated around the discharge opening '17 and in effect con
plication of operating force at a location remote from
stitutes a downward extension of the hopper 12. The
the gate imparts a canting tendency to the gate. To
enclosure 40 includes three substantially vertical walls
counteract the canting, it is now proposed to dispose the
41, 42 and 43 and a sloping wall 44 all having a common
operating shaft immediately beneath the ways support
upper marginal wall 45 surrounding the four walls which
ing the gate and to utilize the operating shaft per se as a
is welded on three sides to the undersurface of the upper
guiding element and thereby take advantage of the rolling
framing structure 19 as indicated at 46.
eifect to minimize frictional resistance.
The lower margin of the chute, like enclosure 40,
In the drawings,
is provided on two sides with grooves 47 and 48. On the
FIGURE 1 is a side elevational view of a portion of a
hopper car showing the improved structure applied there 45 other two sides it has laterally extending walls 49 and 50
against opening movement.
whereby a removable chute can be received in the grooves
and clamped in position to the laterally extending walls
FIGURE 2 is an end elevational View of the structure
49 and 50.
shown in FIGURE 1 as viewed from right to left, said
The gate 18, in closed position, projects appreciably
view showing approximately one half of the width of 50
beyond the chute like enclosure 46. The gate 18 is pro
the car and portions of the car frame in section.
vided with depending lugs 51-51 which mount sleeve
FÍGURE 3 is a plan view of FIGURE l'with the hop
to.
bearings 53 for an operating shaft 54. The shaft 54,
which extends transversely of the path of movement of
FIGURE 4 is a vertical side view similar to FIGURE 55 the gate 18 and beyond the longitudinally extending mem
bers 20 and 21, is located immediately adjacent the under
l except that the gate is shown in opened position and
surfaces of the flanges 24 and 25 and constitutes a guide
certain parts are broken away.
having rolling movement against these surfaces to prevent
FIGURE 5 is a fractional vertical sectional view taken
upward movement of the gate 18.
on a line 5_5 of FIGURE 2. _
The outer ends of the sleeve bearings 5.3-53 which
FIGURE 6 is a detached perspective view of the outer 60
are mounted on the lugs 51-,51 are located in close
toothed rack member.
proximity to the inner edges 24’ and 25’ of the laterally
In FIGURE 2 of the drawings 10 indicates the center
extending llanges 24 and 25, as shown in lFIGURE 2,
sill of the car, 11 one of the car side walls, and _11' one
and thus serve las guides to limit undue sidewise move
of the side sills below the car wall 11. Lying between
the side wall and center sill 10 is a hopper 12 which in 65 ment of the gate 18. On each projecting end ofthe shaft
54 there is fastened a geared pinion 56 which engages
cludes inner and outer side walls 13 and 14 that meet
with toothed racks 57 and 58 respectively. The racks
with longitudinally sloping floors l15 and y16 to form
57 and 58 are located above the level of the gate 18
the four sides of the hopper 12. The -walls 1-3 and 14
and are secured to the upstanding flanges 26` and 27-28
and floors 15 and 16 have their lower marginal edges
spaced from each other to define a rectangular discharge 70 of the side members 20 and 21 along the extensions 20'
per walls and ñoors eliminated and parts broken away
to better illustrate the construction.
opening 117 to discharge lading between the rails 9.
The discharge opening 17 is closed by va sliding gate
and 21' thereof. TheA rack 57, which is located on the
inner side of the hopper 12, includes in an integral
3
3,082,703
structure a laterally extending section 59 having a se
ries of downwardly extending teeth 60 and an upwardly
extending wall section 61 secured by welding 61’ to the
upstanding flange portion 26 of the extension 20’ of the
associated side rail member 2t). The rack 58, which is
located on the outer or operating side of the discharge
hopper ‘12, also includes a laterally extending section
62, similar to the section 59, and has depending teeth
63. Above the laterally extending section 62 there is
use in a railroad car having an opening providing for
the downward discharge of lading and comprising, in
combination, a frame having side walls and end walls
forming a discharge opening, a support flange parallel to
and secured to each of said side walls adjacent the lower
portions thereof and extending toward each other along
opposite sides of said opening, a gate slidable along
the upper surfaces of said support flanges underneath one
of said end walls and in closed position having one end
an attaching portion or wall 64 which is inclined and 10 projecting beyond said one end wall, a shaft rotatably
generally conforms to the inclination of the inclined
mounted on the under side of said gate and parallel to
flange section 2S of ñange 27 and is welded thereto.
the projecting end thereof and extending beyond the
Outstanding from the attaching portion 64 is an out
sides of said gate in juxtaposition to the under sides of
wardly spaced wall 65, FIGURE 6, having a trunnion
said support ñanges and cooperating therewith to hold
66 on which is pivotally mounted a locking dog 67 which 15 down said gate in slidable position along said upper sur
operates to retain the gate 18 in closed and latched posi
faces of said support flanges and movable with said gate,
tion as will be hereinafter described. The wall 65 is also
a pinion non-rotatably mounted on each projecting end
provided with an integrally formed upward extension 68
of said shaft, a rack engaging each pinion throughout
having a key shaped opening 69 for accommodating a
the entire extent of movement of said gate, means sta
sealing pin 70 therethrough. At the outer end of the 20 tionarily mounting each rack with respect to said frame
shaft 54 there is an operating head 71 having a series
of openings 72 for receiving an operating bar 73 at an
angle to the main body of the shaft 54. A pin 74 holds
the operating head 71 in place on the shaft 53.
The operating head 71 is provided with a shoulder 75
with which the pivotally mounted locking dog 67 is
adapted to engage, as shown in FIGURE 5, in order to
as a longitudinal extension of each of said side walls
and laterally outwardly of and parallel to each side of
said gate, and means for rotating said shaft to move
said gate between Closed and open positions.
2. A hopper discharge opening closure structure for
use in a railroad car having an opening providing for
the downward discharge of lading and comprising, in
prevent reverse rotation of the shaft 53 and opening of
combination, a frame having side walls and end walls
the gate "18. The locking dog 67 is formed with a key
forming a discharge opening, a support flange parallel to
shaped opening 76 which is adapted to register with the 30 and secured to each of said side Walls adjacent the lower
key shaped opening 69 in the toothed rack member 58
portions thereof and extending toward each other along
to receive a key shaped end 77 of the sealing pin 70.
opposite sides of said opening, a gate slidabie along the
A stop 78, FIGURE 2, is provided to limit axial move
upper surfaces of said support flanges underneath one of
ment of the sealing pin 70 by engaging handle 79 there
said end walls and in closed position having one end
of, it being understood that the sealing pin 7% is axially 35 projecting beyond said one end wall, bearings stationarily
movable in bearings as provided by extension 68 and
mounted on the under side of the projecting end of said
an apertured lug 80 which is mounted on the ñange 37
gate between said support flanges, a shaft journaled in
of transverse member 36, The stop 78 is welded in
said bearings on the under side of said gate and extend
place after the sealing pin 70 is inserted in the opening
ing perpendicularly transversely of said side walls beyond
40 the sides of said gate in juxtaposition to the under sides
69 in the extension 68.
-It will be noted that this interengagement between
of said support flanges and cooperating therewith to hold
locking dog 67 and shoulder 75 can be effected only when
down said gate in slidable position along said upper sur
the gate 18 is in closed position. Consequently, the lock
faces of said support ñanges, a pinion non-rotatably
ing dog 67 performs the dual function of directly latching
mounted on each projecting end of said shaft, a rack
45
the gate 18 against bodily movement as well as prevent
engaging each pinion throughout the entire extent of
ing rotation of the operating shaft 54.
movement of said gate, means stationarily mounting
The locking dog 67 is swingable to an overbalanced
each rack with respect to said frame as a longitudinal
released position, FIGURE 4, to permit opening move
extension of each of said side walls and laterally out
ment of the gate 18. A stop shoulder 81 projecting lat
wardly of and parallel to each side of said gate, and
erally from member 58 forms a rest for the locking dog 67
means for rotating said shaft to move said gate between
in its released position and, when so positioned, the shoul
closed and open positions.
der 75 on the operating head 71 is below the level of
3._A hopper discharge opening closure structure for
the dog 67 as the lug 75 which moves with the gate 18
use 1n a railroad car having an opening providing for
is swung downwardly due to rotational movement of the
the downward discharge of lading and comprising, in
shaft 54. Consequently the gate Ä18 is freely movable 55
combination, a frame having side walls and end Walls
in a non-interfering relation when the dog 67 is in re
formmg a discharge opening, a support flange parallel
tracted position as shown in »FIGURE 4.
to and secured to each of said side walls adjacent the
The placement of the operating shaft 54 below the
lower
portions thereof and extending toward each other
level of the gate 18 and adjacent the underside of the
along opposite sides of said opening, a gate slidable
ways or flanges 24 and 25 on which the gate 18 slides 60
along the upper surfaces of said support ñanges under
in effect provides largely for a rolling action in the direc
neath one of said end walls and in closed position having
tion of movement of the gate `ll8 between the shaft 54
one end projecting beyond said one end wall, said sup
and the under sides of these supporting ways or flanges
port flanges having extensions projecting outside of said
thus mitigating wear between the parts and making for
one end wall for a distance to support Said gate in full
ease of operation.
65
open position, bearings stationarily mounted on the un
The arrangement of the geared pinions 56 in combina
der
side of the projecting end of said gate between said
tion With the bearings 53 carried by the lugs 51 on the
support ñanges with one end of each bearing juxtaposed
under side of the gate provides guides on each side of
to the adjacent edge of the respective flange extension
the Ways or flanges 24 and 25 which maintain them in
aligned relation with the gate. This eliminates the ne 70 to guide said gate in its movement between open and
closed positions, a shaft journaled in said bearings on
cessity for heavy and cumbersome connecting ties be
the under side of said gate and extending perpendicu
tween the extensions 20’ and 21’ of the longitudinally
larly -transversely »of said side walls beyond the sides
extending members 20 and 21.
of said gate in juxtaposition to the under sides of said
What is claimed as new is:
support flanges and cooperating therewith to hold down
1. A hopper discharge opening closure structure for 75 said
gate in slidable position along said upper surfaces
3,082,703»
5
6
of said support flanges, a pinion non-rotatably mounted
on each projecting end of said shaft, a rack engaging
each pinion throughout the entire extent of movement
of said gate, means stationarily mounting each rack with
combination, a frame having side walls and end Walls
forming a discharge opening, a support flange parallel to
andv secured to each of said side walls adjacent the lower
portions thereof and extending toward each other along
opposite -sides of said opening, a gate slidable along the
upper surfaces of said support ñanges underneath one of
said end walls and in closed position having one end pro
jecting beyond said one end wall, said side Walls and
respect to said frame as a longitudinal extension of each
of said side walls and laterally outwardly of and parallel
to each side of said gate, and means for rotating said
shaft to move said gate between closed and open posi
tions.
support `flanges having extensions projecting outside of
4. A hopper discharge opening closure structure for 10 said one end wall for a distance to support said gate in
full open position, said extensions having gate supporting
use in a railroad car having an opening providing for
surfaces which are coplanar with said upper surfaces
the downward discharge of lading and comprising, in
of said support flanges, bearings stationarily depending
combination, a frame having side walls and end walls
from the under side of the projecting end of said gate
forming a discharge opening, a support flange parallel to
and secured to each of said side walls adjacent the lower 15 between said support flanges and below the plane of said
gate supporting surfaces, a shaft journaled in said bearings
portions thereof land extending toward each other along
parallel to said gate below the plane of said gate sup
opposite sides of said opening, a gate slidable along the
porting surfaces and extending perpend-icularly trans
upper surfaces of said support ñanges underneath one
versely of said side walls and extensions thereof and pro
of said end Walls and in closed position having one end
projecting beyond said one end wall, said support flanges 20 jecting at each end beyond the -sides of said gate and
movable with said gate, a pinion non-rotatably mounted
having extensions projecting outside of said one end Wall
on each projecting end of said shaft, a rack stationarily
for a distance to support said gate in full open position,
mounted on the outer side of each of the side wall ex
bearings stationarily depending from the under side of the
tensions and engaging each pinion throughout the en
projecting end of said gate between said support iianges,
a shaft journaled in said bearings and having cylindrical 25 tire extent of movement of said gate, `and means for ro- `
tating said shaft to move said gate between closed and
cross sections underlying and coextensive with the under
open positions.
sides of said extensions of said support flanges and in
7. A hopper discharge opening closure structure for
close proximity thereto, said shaft being parallel to said
gate and extending perpendicularly transversely of said
use in a railroad car having an opening providing for
side walls and projecting at each end beyond the sides 30 the downward discharge of lading and comprising, in
combination, a frame having side Walls and end walls
of said gate and movable with said gate, a pinion non
forming a discharge opening, a support flange parallel to
rotatably mounted on each projecting end of said shaft,
and secured to each of said side walls adjacent the lower
a rack engaging each pinion throughout the entire ex
portions thereof and extending toward each other along
tent of movement of said gate, means stationarily mount
ing each rack with respect to said frame' as a longitudinal 35 opposite sides of said opening, a gate slidable along the
upper surfaces of said support flanges underneath one of
extension of each of said side walls and laterally out
means for rotating said shaft to move said gate between
said end walls and in closed position having one end
projecting beyond said one end wall, said side walls and
bination, a frame having side walls >and end Walls form
ing a discharge opening, a support flange parallel to and
secured to each of said side walls adjacent the lower
of said support flanges, one of the side wall extensions
being vertical and the other side wall extension having a
vertical lower portion and an upper portion inclined away
wardly of and parallel to each side of said gate, and
support ñanges having extensions projecting outside of
closed and open positions.
5. A hopper discharge opening closure structure for 40 said one end wall for a distance to support said gate
in full open position, said extensions having gate support
use in a railroad car having an opening providing for the
ing surfaces which are coplanar with said upper surfaces
downward discharge of lading and comprising, in com
portions thereof and extending toward each other along
opposite sides of said opening, a gate slidable along the
upper surfaces of said support flanges underneath one of
said end Walls and in closed position having one end
from the frame, bearings stationarily depending from the
under side of the projecting end of said gate between
said support ñanges and below the plane of said gate
supporting surfaces, a shaft journaled in said bearings
projecting beyond said one end wall, said support flanges 50 parallel to said gate below the plane of said gate support
having extensions projecting outside of said one end wall
for a distance to support said gate in full open position,
bearings stationarily depending from the under side of
the projecting end of said gate between said support
flanges with one end of each bearing juxtaposed to the 55
adjacent inner edge of the respective flange extension to
guide said gate in its movement between open and closed
positions, a shaft journaled in said bearings and having
cylindrical cross sections underlying and coextensive with
the under sides of said extensions of said support flanges 60
ing surfaces and extending perpendicularly transversely
of said side walls and extensions thereof and projecting
at each end beyond the sides of said gate and movable
with said gate, a pinion non-rotatably mounted on each
projecting end of said shaft, a rack stationarily mounted
on the outer side of each of the side wall extensions and
engaging each pinion throughout the entire extent of
movement of said gate, the rack -mounted on .the one
side Wall extension having a vertical wall overlying the
outer vertical side wall surface of said one side wall
extension, the rack mounted on the other side wall
having an upwardly extending wall overlying and con
forming to the vertical and inclined outer side wall surface
of said side walls and projecting at each end beyond the
of said other Side wall, and means for rotating said shaft
sides of said gate and movable with said gate, a pinion
non-rotatably mounted on each projecting end of said 65 to move said gate between closed and open positions.
and in close proximity thereto, said shaft being parallel
to said gate and extending perpendicularly transversely
shaft, a rack engaging each pinion throughout the entire
8. A hopper discharge opening closure structure for
extent of movement of said gate, means stationtarily
mounting each rack with respect to said frame as a
use in a railroad car having an opening providing for the
downward discharge of lading and comprising, in combi
nation, a frame having side Walls and end walls forming
longitudinal extension of each of said side walls and lat
erally outwardly of and parallel to each side of said 70 a discharge opening, a support flange parallel to and
secured to each of said side walls adjacent the lower por
gate, and means for rotating said shaft to move said
tions thereof and extending toward each other along op
gate between closed and open positions.
posite sides of said opening, a gate slidable along the
l6. A hopper discharge opening closure structure for
upper surfaces of said support flanges underneath one of
use in a railroad car having an opening providing for
the downward discharge of lading and comprising, in 75 said end walls and in closed position having one end pro
3,082,703
7
8
jecting beyond said one end wall, said side walls and sup
port flanges having extensions projecting outside of said
one end wall for a distance to support said gate in full open
position, said extensions having gate supporting surfaces
one end wall for a distance to support said gate in full
which are coplanar with said upper surfaces of said sup~
open position, bearings stationarily depending from the
port flanges, bearings stationarily depending from the
under side of the projecting end of said gate between said
support flanges, a shaft journaled in said bearings and
having cylindrical cross setions underlying and coextensive
with the under sides of said extensions of said support
under side of the projecting end of said gate between said
support lianges and below the plane of said gate supporting
surfaces with one end of each bearing juxtaposed to the
adjacent inner edge of the respective flange extension to
ñanges and in close proximity thereto, said shaft being
guide said gate in its movement between open and closed
parallel to said gate and extending perpendicularly trans 10 positions, a shaft journaled in said bearings parallel to
versely of said side walls and extensions thereof and pro
said gate below the plane of said gate supporting surfaces
jecting at each end beyond the sides of said gate and mov
and extending perpendicularly transversely of said side
able with said gate, a pinion non-rotatably mounted on
walls and extensions thereof and projecting at each end
each projecting end of said shaft, a rack stationarily
beyond the sides of said gate and movable with said gate,
mounted on the outer side of each of the side wall exten 15 a pinion non-rotatably mounted on each projecting end
sions and engaging each pinion throughout the entire
of said shaft with one end of each pinion juxtaposed to
extent of movement of said gate, and means for rotating
the adjacent outer edge of the respective flange extension
said shaft to move said gate between closed and open
to guide said gate in its movement between open and
positions.
closed positions, a rack stationarily mounted on the outer
9. A hopper discharge opening closure structure for 20 side of each of the side wall extensions and engaging each
use in a railroad car having an opening providing for
pinion throughout the entire extent of movement of said
the downward discharge of lading and comprising, in
combination, a frame having side walls and end walls
forming a discharge opening, a support ñange parallel to
between closed and open positions.
gate, and means for rotating said shaft to move said gate
11. A hopper discharge opening closure structure for
and secured to each of said side walls adjacent the lower 25 use in a railroad car having an opening providing for the
portions thereof and extending toward each other along
opposite sides of said opening, a gate slidable along the
downward discharge of lading and comprising, in combi
nation, a frame having side walls and end walls forming
a discharge opening, support means parallel to and secured
to each of said side walls adjacent the lower portions
upper surfaces of said support iianges underneath one of
said end walls and in closed position having one end pro
jecting beyond said one end wall, said side walls and sup 30 thereof and extending toward each other along opposite
port ñanges having extensions projecting outside of said
sides of said opening, a gate slidable along said support
one end wall for a distance to support said gate in full
means underneath one of said end walls and in closed
open position, said extensions having gate supporting sur
position having one end projecting beyond said one end
wall, said side walls and support means having extensions
faces which are coplanar with said upper surfaces of said
support ñanges, bearings stationarily depending from the 35 extending beyond said one end wall for a distance to sup
under side of the projecting end of said gate between said
port said gate in full open position, bearings depending
support flanges and below the plane of said gate supporting
from the under side of the projecting end of said gate at
surfaces with one end of each bearing juxtaposed to the
adjacent inner edge of the respective ñange extension to
the projecting end thereof and located between said exten
sions of said support means, a shaft journaled in said bear
guide said gate in its movement between open and closed 40 ings and having cylindrical cross sections underlying and
positions, a shaft journaled in said bearings parallel to
coextensive with the under side of said extensions of said
said gate below the plane of said gate supporting surfaces
support means and in close proximity thereto, said shaft
and extending perpendicularly transversely of said side
being parallel to said gate and extending perpendicularly
walls and extensions thereof and projecting at each end
transversely of said side walls and extensions thereof and
beyond the sides of said gate and movable with said gate, 45 projecting at each end beyond the sides of said gate and
a pinion non-rotatably mounted on each projecting end
movable with said gate, a pinion non-rotatably mounted
of said shaft, a rack stationarily mounted on the outer
on each projecting end of said shaft, a rack stationarily
side of each of the side wall extensions and engaging each
mounted on the outer side of each of the side wall exten
pinion throughout the entire extent of movement of said
sions and engaging each pinion throughout the entire
gate, and means for rotating said shaft to move said gate 50 extent of movement of said gate, and means for rotating
between closed and open positions.
said shaft to move said gate between closed position and
l0. A hopper discharge opening closure structure for
use in a railroad car having an opening providing for
the downward discharge of lading and comprising, in
combination, a frame having side walls and end walls 55
forming a discharge opening, a support flange parallel to
and secured to each of said side walls adjacent the lower
portions thereof and extending toward each other along
opposite sides of said opening, a gate slidable along the
upper surfaces of said support ñanges underneath one of 60
said end walls and in closed position having one end pro
jecting beyond said one end Wall, said side walls and sup
port flanges having extensions projecting outside of said
open position.
References Cited in the file of this patent
UNITED STATES PATENTS
1,122,918
Hart et al. __________ __ Dec. 29, 1914
2,317,007
Weniger ____________ __ Apr. 20, 1943
2,318,763
2,386,702
Ditchiield ___________ _- May 11, 1943
McBride _____________ __ Oct. 9, 1945
2,690,139
2,753,815
2,791,973
2,993,452
Dorey
Dorey
Dorey
Dorey
______________ __
______________ __
______________ __
______________ __
Sept.
July
May
July
28,
10,
14,
25,
1954
1956
1957
1961
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