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Патент USA US3062404

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Nov. 6, 1962
3,062,398
M. G. KORDES
SANITARY MANHOLE ASSEMBLY
Filed Dec. 5, 1960
2 Sheets-Sheet 1
I10.4‘
MW
6
MM.@
s/MM
Nov. 6, 1962 >
M. e. KORDES
3,062,398
SANITARY MANHOLE ASSEMBLY
2 Sheets-Sheet 2
Filed Dec. 5, 1960
INVENTOR.
Myra/7 & Kora/e5
BY
4
//
ATTQRN 5.
ilnite States Patent
1
tine
3,052,328
Patented Nov. 5, 1962
2
FIG. 3 is a fragmentary, cross-sectional side elevational
3,062,398
Myron G. Kordcs, Kansas City, Mo., assignor to Standard
SANITARY MANHOLE ASSEMBLY
view of subject invention illustrating the pair of closure
elements and the lever means forming a part thereof;
FIG. 4 is an enlarged, fragmentary, cross-sectional side
and elevational view taken along line 4-—4 of FIG. 2;
Missouri
FIG. 5 is an enlarged, fragmentary view of the sealing
Filed Dec. 5, 1969, Ser. No. 73,635
gasket and the pressure equalizing means thereon; and
13 Claims. (Cl. 220-29)
FIG. 6 is a cross-sectional view of the gasket taken
This invention relates to closure for access openings
along lines 6—6 of FIG. 5.
in materials-containing tanks and more particularly, 10
The closure member which is the subject of this inven
tanks utilized for the transfer and storage of liquid food
tion is broadly denoted by the numeral 10 and the same
products requiring that the tanks and closures therefor
provides a means for closing the open, upper end 12 of
be maintained in a sanitary condition to prevent the
an upright, tubular device 14 having a cylindrical side
formation of germs therein and the contamination of
wall 16. Device 14 is secured to the top wall 18 of a
the products carried thereby.
15 storage tank (not shown) having a circular access open~
It is the primary object of this invention to provide a
ing 26 therein, it being noted that device 14 is secured to
closure member for closing an access opening in a
wall 13 in communication with opening 20 as by welding
tank adapted to contain liquid food products to seal the
or the like. It is contemplated that closure member 10 be
tank from the contaminating effects of foreign objects
utilized with tanks adapted to store and transport liquid
present in the atmosphere and to prevent the formation
food products, which tanks are usually provided with a
of germs therein to thereby maintain the contents of
shell 22 in surrounding engagement to wall 18 and the
the tank in a sanitary condition to comply with recog
remainder of the tank so as to present a space 24 between
nized standards of health.
tank and shell wherein insulating material may be placed
Another important object of this invention is the pro
so as to protect the contents of the tank against extremes
vision of a closure member for the access opening of a 25 of atmospheric temperatures. Shell 22 is provided with
materials-containing tank, which closure member may
an opening aligned with opening 20 so as to permit device
be easily and quickly shifted so as to permit ready access
14 to pass through shell 22, it being noted that the upper
to the opening and to facilitate the rapid cleaning of the
end 12 of device 14 is spaced above shell 22 as is clear
closure member to maintain the same and thereby the
in FIG. 2.
interior of the tank in a substantially sanitary condition. 30
Closure member 16 includes a pair of relatively shift
Still another important object of this invention is to
able elements 26 and 28 which may be super-imposed over
provide a closure member for an access opening in a
the open upper end 12 of device 14 for closing the latter,
Steel Works, Inc., Kansas City, Mo., a corporation of
tank, which member includes a pair of relatively shift
able closure elements adapted to be super-imposed over
the opening, the upper of said elements serving as a
dust cover and the lower of said elements sealing the
opening, wherein the tank is su?iciently insulated from
the introduction of contaminating effects even when
the upper of the elements is shifted to a position clear
ing the opening.
Yet another important object of the present invention
is the provision of means on the relatively shiftable ele
ments for interconnecting the same and for limiting the
relative movement thereof, whereby the elements are ef
fectively secured togther so as to form an integral unit
manipulable for easy access to the interior of the tank
to which the elements are operably coupled.
Other important objects of this invention relate to the
provision of structure including a pair of relatively shift
able, U-shaped linkages interconnecting the closure ele
ments, whereby one of the elements may be shifted rela
tive to the other elements; to the provision of projections
on opposed faces of the elements, whereby said linkages
a ?rst of said elements, namely element 26 taking the
form of a ?at plate having a pair of opposed faces 30
and 32, the second of said elements, namely element 28,
taking the form of a concave-convex shell having a con
cave inner surface 34 and a convex outer surface 36.
Element 26 is provided with an annular ?ange 38 in
tegral therewith at the outer periphery thereof, which
?ange 38 is engageable with an annular head 40 forming
a part of an annular gasket 42 of resilient material dis
posed on upper end 12 of device 14. Flange 38 is pro~
vided with an arcuate portion 44 which complenentally
engages the outer surface of annular head 40 when ?rst
element 26 covers the upper open end 12 of device 14,
by virtue of which complemental engagement, bead 40
is compressed against upper end 12 of device 14, thus
sealing the latter against the entrace therein of foreign
objects present in the atmosphere and thereby prevents
the formation of germs in the contents carried by the tank
to which device 14 is attached. Flange 38 is further pro
vided with a transversely upright portion 46 integral with
arcuate portion 44, which upright portion 46 is substan
may be secured to the corresponding elements; to the pro
tially parallel with and substantially concentric to an an
vision of hinge means on the upper element and the tank, 55
nular, upright section 48 of gasket 42 integral with the
whereby the upper element and thereby the lower element
annular head 40 thereof, it being noted that the outer
may be swingable relative to the tank to permit access to
most extremity of ?ange 38 is spaced above an annular,
the opening in the latter; to the provision of lever means
transverse section 56 integral with upright section 48 and
for maintaining the elements in a position closing the
opening and the tank; and to the provision of bearing 60 extending laterally from device 14, as is clear in FIG. 2.
Second element 28 is provided with an annular ?ange
means on the lever means for engaging the upper element
52 having a transversely arcuate portion 54 substantially
and urging the same downwardly into engagement with
overlying arcuate portion 44 and thereby bead 40 when
the lower element when the latter closes said opening.
both ?rst and secondelements 26 and 28 cover the open
Other objects of this invention will become apparent
as the following speci?cation progresses, reference being 65 end 12 of device 14. Flange 52 is further provided with
a transversely upright portion 56 which slightly ?ares out
made to the accompanying drawings wherein:
wardly from device 14 and diverges relative to upright
FIG. 1 is a fragmentary, cross-sectional plan view of
portion 46 of ?ange 38 as the outer most extremity of
the tank closure member which is the subject of this
second element 28 is approached. It is to be noted that
invention;
FIG. 2 is a cross-sectional, side elevational view of the 70 when elements 26 and 28 are disposed on device 14 as
in shown in FIG. 2, the outermost extremity of ?ange
closure member of FIG. 1, taken along line 2—2 of
S2 of second element 23 engages the normally upper
FIG. 1;
3,062,398
4
3
most surface 58 of transverse section 50 in sealing rela
tionship therewith so that the interengagement between
second element 28 with ?ange 42 further prevents the
introduction of foreign objects within the open upper end
by tightening wing nut 82 to a substantial degree, second
element 28 is prevented from rotating about the axis of
shaft 78 unless a substantially large lifting force is applied
12 of device 14, and thereby the interior of the tank to
fact that when wing nut 82 is tightened, the ends of
which the latter is attached.
In addition, transverse sec
tion 50 is permitted to freely ?ex downwardly under the
in?uence of ?ange 52 to thereby permit the full compres
sion of bead 40 under the in?uence of ?rst element 26.
thereto to cause the rotation thereof.
This is due to the
shafts 78 are more ?rmly seated within slot 90 so as to
require a proportionately greater force to overcome the
sliding friction between the ends of shaft 78 and the adja
cent surfaces of slots 90.
Means for interconnecting elements 26 and 28 include
It is clear that ?ange 38 circumferentially engages head 10
a pair of relatively shiftable components 94 and 96 each
40 and ?ange 5‘2 circumferentially engages surface 58
shiftably mounted on a corresponding element and pivot~
when elements 26 and 28 are disposed in the position
ally mounted on the adjacent component to limit the
shown in FIG. 2. Arcuate portion 54 of ?ange 52 is
movement of one of the elements relative to the other
provided with a plurality of dimples 60 stamped therein
and circumferentially spaced to slightly space the inner 15 element. Components 94 and 96 comprise U-shaped
linkages 98 and 100 respectively, it being noted that
surface of arcuate portion 54 of ?ange 52 above the outer
linkage 100 is disposed within linkage 98 and the spaced
surface of arcuate portion 44 of ?ange 38 for a purpose
sides 102 of the latter are somewhat shorter in length
hereinafter described.
than are the sides 104 of linkage 100. Sides 102 of
Hinge means 62 are provided on second element 28,
shell 22 and device 14 for swinging second element 28 20 linkage ‘)8 are provided with pins 166 rigid thereto at the
extremities thereof, it being noted that pins 186 ex
about a subsatntially horizontal axis toward and away
tend outwardly in opposite directions to be received in
from the open, upper end 12 of device 14 so as to gain
the perforations of a pair of spaced, perforated ears 108
access to the latter and thereby the interior of the tank
secured uprightly on upper face 32 of ?rst element 26.
to which the same is attached. Hinge means 62 includes
25 In like manner, sides 104 of linkage 100 are provided
a ?rst U-shaped bracket 64 carried by shell 22 and a
with pins 110 extending outwardly in opposite directions
second U-shaped bracket 66 carried by second element
to be received in a pair of spaced, perforated ears 112
28 and mounted for shiftable movement relative to ?rst
bracket 64. First bracket '64 is provided with a bight
portion 68 secured to the upper surface of shell 22 by
a plurality of threaded bolts 70‘ threadably received in
aligned openings in bight portion 68 and the corresponding
region of shell 22.
?rst bracket 64 and
vided and includes
of ?rst bracket 64,
secured to the concave lower face 34 of second element
28. Sides 104 of linkage 100 are further provided with
pins 114 intermediate the ends thereof and spaced out
wardly in the same direction as pins 110, pins 114 being
received in openings in sides 102 of linkage 98 which
To reinforce the connection between
are aligned therewith so as to mount linkage 100 on
shell '22, a U-shaped brace 72 is pro
linkage 98 for pivotal movement relative thereto. It is
a bight 74 underlying the bight 68 35 clear that by virtue of the pivotal mounting means in
it being noted that bight 74 is pro
cluding pins 106, 110 and 114 and ears 108 and 112,
vided with openings for threadably receiving bolts 70 for
second element 28 may be shifted to a limited degree
interconnectnig brace 72 with ?rst bracket 64. The
relative to ?rst element 26 when the latter covers the
peripheral edge of brace 72 adjacent device 14 is welded
open upper end 12 of device 14 prior to the shifting
to the latter so as to secure ?rst bracket 64 to both shell
of ?rst element 26 away from end 12 to gain access to
22 and device 14.
the interior of the tank to which device 14 is attached.
First bracket 64 is provided with a pair of spaced,
Linkages 88 and 100' are made of a material which
upright legs 76 which are provided with aligned openings
is substantially ‘rigid but which is of a nature to impart
into which is journaled a shaft 78 spaced above and sub
a certain amount of ?exibility to sides 102 and 104 there
stantially parallel with bight portion 68 of ?rst bracket
of so that the same may be ?exed to permit the insertion
64. The ends of shaft 78 project outwardly from legs
76 as is clear in FIG. 4 for the purpose of mounting second
of respective pins 106 and 110‘ into the perforations of
ears 108 and 112 respectively. Further, pins 114 may
be inserted in the openings in sides 102 by ?exing the
latter and sides 104.
bracket 66 in a manner hereinafter described.
Secured
to shaft substantially midway between the ends thereof and
extending laterally therefrom is an elongated rod 80 hav 50
Means are provided on closure member 10 for main
ing the end thereof spaced from shaft 78 threaded so as
to mount an internally threaded wing nut 82 thereon, the
latter providing a fastening means for interconnecting
brackets 64 and 66.
taining second element 28 in substantial engagement with
?rst element 26 when the elements close the upper end 12
of device 14 and comprise a pair of levers 116 swingably
mounted on device 14 and provided with bearing means
Second bracket 66 is provided with a perforated bight 55 engageable with the convex upper surface of second
element 28 to urge the latter into engagement with ?rst
portion 84, a pair of spaced, slotted side legs 86 integral
element 26. Each lever 116 is provided with a threaded
with opposed side edges of bight portion 84, and a tab
bore 118 which receives the threaded end 120 of an L
portion 88 secured to an end edge of bight portion 84
shaped support 122, it being clear that the length of sup
and extending away from legs 86 so as to engage the
convex outer surface 36 of second element 28. Tab 88 60 port 22 having the threaded end 120 is substantially par
is rigidly secured to surface 36, as by welding, to thereby
secure bracket 66 to second element 28.
Each leg 86
allel with the central axis of device 14. The opposite
end of support 122 is secured rigidly to device 14 in any
suitable manner, such as by welding. Lever 116 is pro
is provided with a U-shaped slot 90 therein at the extremity
vided with a groove 124 therein proximal to the end
thereof spaced from bight portion 84, and slots 90 com
plementally receive the opposed ends of shaft 78 to permit 65 thereof containing bore 118 and a shaft 126 rigidly
mounting a roller 128 thereon is journaled in opposed
second bracket 66 and thereby second element 28 to be
faces of groove 124 to permit roller 128 to be rotatable
rotatable relative to ?rst bracket 64 and thereby device
about the longitudinal axis of shaft 126. Roller 128 is
14 about an axis through shaft 78. The threaded end of
adapted to engage the arcuate portion 54 of annular
rod 80 extends through a perforation 92 in bight portion
84 to effectively interconnect brackets 64 and 66 and 70 ?ange 52 integral with second element 28 when lever 116
is swung about the end of support 122. If the threads
thereby provide a fastening means, together with wing
of bore 118 and end 120 of support 122 are of the con
nut 82, for maintaining the ends of shaft 78 within slots
ventional right hand type, and if lever 116 is rotated in
90 of legs 86.
a clockwise manner as viewed in FIG. 1, it is clear that
Hinge means 62 further provide a means of maintaining
elements 26 and 28 in the position shown in FIG. 2, since 75 lever 116 and thereby roller 128 will advance toward the
3,062,398 >
5
6,
upper open end 12 of device 14 when lever 116 is so
swung. It is sufficiently clear that when lever 116 is
swung in the clockwise manner, roller 128 engages arcuate
portion 54 of annular ?ange 52 to urge the latter and
thereby second element 28 into engagement with ?rst ele
ment 26. As long as roller 128 engages arcuate portion
28 is rotated about the longitudinal axis of shaft 78
until second bracket 66 of hinge means 62 engages the
proximal portion of shell 22. Element 28 is thus sup
ported by shell 22 and in a position clearing the top of
to the central portion 140 of disc 136 and the end of con
After access has been gained to the interior of the
tank, ?rst element 26 is moved to a position closing the
end 12 of device 14, whereupon second element 28 moves
in overlying engagement with ?rst element 26 to main
tain the latter in sealed relationship relative to gasket
device 14.
It is to be understood that swinging move
ment of element 28 away from covering relationship to
54 of annular ?ange 52, second element 28 remains in
the top of device 14 causes element 26 to be partially
a ?xed position relative to ?rst element 26 and lever 116
lifted out of engagement with gasket 42, since the lon
must be swung so as to move roller 128 out of engage
gitudinal axes of linkages 98 and 100 become substantial
ment with arcuate portion 54 before second element 28 10 ly coextensive before bracket 66 engages shell 22. Fur
may be shifted relative to ?rst element 26.
ther swinging of element 28 about the axis of shaft 78 is
To facilitate the shifting of elements 26 and 28 rela
su?icient to swing element 26 away from device 14
tive to device 14, handles 130 and 132 are secured to
about an axis through the point of contact of arcuate por
upper face 32 of ?rst element 26 and convex outer sur
tion 44 with bead 40 adjacent hinge means 62. The
face 36 of second element 28, respectively.
15 operator of closure member 10 may then manually swing
Valve means are also provided in closure member 10
element 26 until the latter is completely disposed within
to maintain the pressures within the tank to which mem4
element 28. Access to the tank is thus assured. In
ber 10 is secured substantially equal to the pressure of
FIG. 2 an intermediate position of second element 28
the atmosphere surrounding the tank and closure mem
shown by the dashed lines of FIG. 2. By virtue of link
ber 10. Such valve means, forming no part of the instant 20 ages 98 and 100, second element is limited to its move
invention, include a convex-concave part 134 which is
ment relative to ?rst element 26 and furthermore, link
integral with ?rst element 26, and a channel shaped disc
ages 98 and 100 provide hinge means for mounting ?rst
136 interconnected with part 134 by means of a connec
element 26 on second element 28 to thereby guide ?rst
tive 138 extending through aligned openings in part 134
element 26 when the same is moved away from the open
and disc 136, it being noted that connective 138 is rigid 25 upper end 12 of device 14.
nective 138 inserted through the opening in part 134 is
retained therein by a key 142 in the manner shown in
FIG. 1. Disposed between part 134 and disc 136 is an
initially ?at, resilient, annular diaphragm 144 in sealing
engagement with the central portion 140 of disc 136 and
the connection of part 134 with the remainder of ?rst
element 26.
Disc 136 is mounted in a manner so as to
present a passage 146 between the lower face 30 of ?rst
42. Levers 116 are thereupon swung in a clockwise
manner as viewed in FIG. 1 until the rollers 128 engage
the arcuate portion 54 of annular ?ange 52 to preclude
movement of second element 28 relative to first element
element 26 and the upper peripheral edge of annular 35 26. It is clear, by virtue of the sealed relationship be
?ange 148 integral with disc 136. When the pressure
tween annular ?ange 52 and transverse section 50 of
within the tanks to which closure member 10 is attached
gasket 42, no foreign materials may enter the space be
increases to a value above that of the atmosphere, the air
tween elements 26 and 28, thus preventing the introduc
passes through passage 146 to the under side of diaphragm _ tion of contaminating bodies into the tank through the
144 whereupon the latter is raised out of engagement 40 valve means in ?rst element 26.
with central portion 140 to permit the air to ?ow toward
It is clear that closure member 10 provides a means
connective 138 and out through an opening 150 centrally
for easily and quickly gaining access to the interior of
disposed in diaphragm 144. The air particles then ?ow
the tank to which member 10 is attached and, further
out through perforations 152 in part 134 and thence into
permits limited relative movement of elements 26 and 28.
the region between ?rst andsccond' elements 26 and 28. 45 Further, by virtue of the instant structure, ?rst element
By virtue of the dimples 60 in annular ?ange 52 of second
26 is not hingedly connected to the tank or device 14
element 28, the air is permitted to ?ow out .of the space
but is hingedly mounted to the second element 28, thus
between the elements and, further, by virtue of the re
overcoming the objectionable requirement of interrupt—
silient nature of gasket 42, the air. forces the. transverse
ing gasket 42 to clear ?ange 38 when ?rst element 26
section 50 of gasket 40 to move out of engagement with 50 is shifted away from end 12 of device 14. It can be
the outermost edge of ?ange 52 to thereby'permit the out
seen that linkages 98 and 108 are utilized to intercon
ward ?ow of air to equalize the pressure within the tank.
nect elements 26 and 28 in lieu of hinge means for ele
In the event that the pressure within the tank falls be
ment 26 operably coupling the latter with device 14 and
low that of the atmosphere, air enters the region be
shell 22. Element 26 is, therefore, prevented from ac
tween elements 26 and 28 by ?rst entering a region 55 cidentally being dropped from the location on the tank
formed by side walls 16 of device 14 and a grooved
at which it is normally used and thus is prevented from
portion 154 on the inner surface of gasket 42. Since the
getting contaminated by contact with the ground and
pressure on the normally outer surface of gasket 42 is
surrounding structure. Furthermore, the swinging of
less than the pressure against the surface formed by
element 28 to a position supported by shell 22 is suf
grooved portion 154, gasket 42 is forced out of engage
?cient to partially lift element 26 about from device 14
ment from device 14 in the region proximal to grooved
and thus facilitate the complete swinging of element 26
portion 154 and the air flows through a longitudinal slot
to a position clearing the open top of device 14. Link
156 formed in gasket 42 above grooved portion 154,
ages 98 and 108 also guide element 26 into element 28
whereupon the air ?ows into the region between elements
when the former is swung toward the latter and away
26 and 28 by virtue of the passages therebetween formed 65 from device 14. The construction of linkages 98 and
by dimples 60. The air then ?ows through perforations
180 is such as to be able to house the latter between ele
152 of part 134 and against the upper surface of dia
ments 26 and 28 while the peripheral margin of element
phragm 144 to cause the latter to ?ex downwardly and
28 is utilized to force the entire peripheral margin of ele
out of engagement wtih the connection of part 134 with
ment 26 into engagement with head 40 of gasket 42.
the remainder of ?rst element 26. The air then ?ows
Having thus described the invention what is claimed as
between part 134 and diaphragm 144 into the passage 146
new and desired to be secured by Letters Patent is:
and ?nally into the tank therebelow.
1. In a manhole assembly for a tank having an access
When it is desired to gain access to the interior of the
opening therein, a closure member for closing said open—
tank to which closure member 10 is attached, either for
ing and including a pair of relatively shiftable elements,
?lling the tank or for cleansing the latter, second element 75 a ?rst of said elements having a continuous periphery
8,062,898
adapted to be removably disposed in closing relationship
to said opening with the periphery thereof engaging the
tank in surrounding relationship to said opening a second
of said elements adapted to be swingably mounted on
said tank for movement toward and away from said
opening and said ?rst element when the periphery of the
face of said ?rst element to provide a hollow space be
tween said elements when the latter overlie the device;
hinge means carried by said device and operably coupled
with said second element for sw'ingably mounting the lat
ter for movement toward and away from the upper end
of the device; and shiftable linkage means on said ele
ments normally disposed within said space for inter-con
necting the elements and limiting the relative movement
thereof, whereby said elements may be independently
the entire periphery of said ?rst element to force the
latter into engagement with said tank; and means on said 10 shifted to a location clearing said opening to thereby pro
vide access to the latter.
elements for inter-connecting the same and for limiting
7. In a manhole assembly as set forth in claim 6,
the relative movement thereof, whereby, said ?rst ele
wherein said device is provided with a cylindrical side
ment may be shifted to a location clearing said opening
wall, and wherein each of said elements is provided with
and adjacent said second element when the latter has
an annular flange depending therefrom at the periphery
moved away from said opening to thereby permit access
thereof adjacent the side wall of said device, the ?ange
to the latter.
‘
of said second element being engageable with said gasket
2. In a manhole assembly as set forth in claim 1, where
to force the latter into sealing relationship with said de
in said ?rst element is provided with a ?at, outer surface
vice.
and said second element is provided with a substantially
8. In a manhole assembly as set forth in claim 7,
concave inner surface, said means being disposed between
wherein said gasket is transversely L-shaped and provided
said surfaces when said elements are in positions clos
with a pair of mutually perpendicular, annular sections,
ing said opening.
one of said sections projecting outwardly from the side
3. In a manhole assembly as set forth in claim 1,
wall of said device and having an upper surface spaced
wherein said inter-connecting means comprises a pair of
below the upper end of the device, the ?ange of said
elongated, relatively shiftable components each pivotally
latter engages said tank said second element having a
continuous periphery disposed for substantially engaging
secured at one end thereof to a corresponding element
and proximal to opposite end thereof to the adjacent
second element engaging said surface of said one sec
tion in sealing relationship therewith when said second
element overlies said ?rst element and said device.
9. In a manhole assembly as set forth in claim 8,
wherein said components each comprises an elongated 30 wherein said gasket is provided with an annular bead
component.
4. In a manhole assembly as set forth in claim 3,
U-shaped linkage having yieldable sides and opposed
ends pivotally mounted on the corresponding element, and
wherein is included pin means on the sides of each of
the linkages for pivotally mounting the adjacent linkage
thereon for relative movement responsive to the move
ment of one of the elements relative to the other element.
5. In a manhole assembly for a tank having an ac
cess opening therein, a closure member for closing said
opening and including a pair of relatively shiftable ele
ments, a ?rst of said elements having a continuous pe
riphery adapted to be removably disposed in closing rela
tionship to the opening with the periphery thereof engag
thereon integral with the other of said sections thereof,
said head being disposed under compression between said
upper end and said ?rst element when the latter closes
said end, said one section being disposed to freely ?ex
downwardly under the in?uence of the flange of said
second element to thereby permit the full compression
of said bead under the in?uence of said ?rst element.
10. In a manhole assembly as set forth in claim‘ 6,
wherein said hinge means comprises a ?rst U-shaped
bracket rigidly secured to said device and provided with
a pair of spaced legs thereon, a shaft journaled in said
legs, and a second U-shaped bracket rigidly secured to
said second element and provided with a pair of spaced
ing the tank in surrounding relationship to said opening, a
second of said elements adapted to be swingably mount
legs operably coupled with said shaft for rotation rela
ed on said tank for movement toward and away from said
tilvefto said first bracket about the longitudinal axis of said
opening and said ?rst element when the periphery of the
latter engages said tank, said second element having a
s a t.
periphery disposed for substantially engaging the entire
wherein the legs of said second bracket are provided
periphery of said ?rst element to force the latter into
engagement with said tank; clamp means including a
with recesses therein for receiving the opposed ends of
said shaft, and wherein is provided means on said shaft
and said second bracket for maintaining the ends of the
swingable roller adapted to be carried by said tank and
engageable with said second element for releasably forc
ing the periphery of the latter in engagement with the
periphery of said ?rst element when the latter closes said
11. In a manhole assembly as set forth in claim 10,
shaft within said recesses.
12. In a manhole assembly as set forth in claim 6,
wherein is included means carried by said device for
opening; and means on said elements for inter-connect
releasably maintaining the second element in engagement
ing the same and for limiting the relative movement there
of, whereby said ?rst element may be shifted to a loca
with the ?rst element, said means including an elongated
support rigidly secured to said device, an elongated lever
swingably mounted on said support for rotation relative
tion clearing said opening and adjacent said second ele
ment when the latter has moved away from said opening 60 thereto about the longitudinal axis thereof, and bearing
to permit access to the latter.
means carried by said lever and engageable with said
6. In a manhole assembly for a tank having an access
second element for urging the latter into engagement with
opening therein disposed in the top thereof, an upright,
the ?rst element when said lever swings about said axis
tubular device adapted to be secured at the lower end
of said support.
thereof to said tank in surrounding relationship to said
opening therein; an annular sealing gasket of resilient
material carried by said device at the open, upper end
thereof; a ?rst element having a continuous periphery
and engageable at the periphery thereof with said gasket
for sealing the upper end of said device; a second element
having a continuous periphery engageable at the periphery 70
thereof with the periphery of said ?rst element in overly~
ing relationship therewith, said second element being
provided with an inner surface spaced from the upper
13. In a manhole assembly as set forth in claim 12,
wherein said bearing means comprises a roller journaled
at opposed ends thereof in said lever.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,753,946
2,014,861
Replogle _____________ __ Apr. 8, 1930
Neely _______________ __ Sept. 17, 1935
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