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Патент USA US2108238

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Feb. 15, 193s.
H. A. sTRELow
2,108,238
CLOSURE
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"Filed sept. 2e, 1956
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Feb. 15, 193s.
H, A, SfRELOW
2,108,238'
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INVENTOR.
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ATTORNEY. ï
Perepte'd Feb. 1s,- 193s
" ’ 2,108,238 y
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UNÍTED STATES PATENT OFFICE.
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Henry A. Strelow, Mllwaukeq'Wis., assigner tc
The Heil Co., Milwaukee, Wis., a corporation '
of Wisconsin
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Application september zo, i936, serial No. 'masas
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1a claims.
. My :resent invention relates in general to irn
provements in the art oi' manufacturing and of
sealing receptacles, andV relates more specifically
(Cl. 220-57)
‘ '
.
_ Still another speciiic object of my invention
is the provision of a new and useful manhole
closure assemblage especially adapted. for use in
conjunction with streamlined vehicular tanks,
to improvements in the construction- and opera.
5 4tion of closures for the manhole or inspection .f and which may be manufactured and installed 5
yopenings of tanks or the like.
yat moderate cost. \
>
_
,
aThese and other specific _objects and advan
vention is to f provide an improved closure of .tages will- be apparent _from the following de
Generally defined, an object of the present in
simplified construction which -will effectively seal _
l0 the manhole or inspection opening oi a’ vehicular
tank or similar receptacle.
Many types' of covers have heretofore been
tailed description.
_
_
_
A clear conception of the various features con- l0
stituting the present improvement, and of thev
inode of constructing and of utilizingl manhole
closures built in accordance with the invention,
utilized in the. endeavor to effectsealing of the
manholes or inspection of openings of vehicular l may be had byreferring to the drawings accom
15 tanks for transporting ,and dispensing liquids panying and -forming a part of this invention l5
such as gasoline, oil, and milk; but none of these wherein like reference characters designate the
prior closures are entirely satisiactory._.f~Most of -‘ same or similar parts in the various views.
‘ Fig. 1 is a top view of one ofthe closures show-'
ing the same applied to a fragment of a tank,
20 do not añord tight' closing of the openings at _ with the automatic latching device and the final 20
latching lever released;
_
all times and under all conditions. 'I'hese man
Fig.- 2 is a longitudinal vertical section through
hole covers are frequently left open by the at-“‘
tendants, and unless they are closed so as‘to pro I.the closure and tank fragment of Fig. 1.. likewise
the prior manhole covers that provide effective
seals, are too complicated, and the simpler types
vide for sealing when the transporting vehicle is ' showing the latching devices released preparatory
25 set in motion, considerable loss- of liquid through
the manhole results. -It is therefore desirable to
provide for automatic closing of the covers when
the tank -truck is starting, and it is also neces
sary to _insure tight sealing at these manholes
' 30 as the sealing gaskets become worn or compressed
due to constant use. Closures of this typeshould
_
also be adaptable for use .in conjunction with
streamlined' tanks without impairing the stream
lined appearance, and should be quickly and con
35 veniently manipulable without endangering the
operator. ' None of the prior manhole cover as
semblages are adapted to meet all of these con
tingencies, and all of them'aretherefore _more
or less objectionable.
40
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_
to opening of the cover; '
line I-‘l of F18. 2;
vention to provide an improved manhole closure
assembly which besides being simple, compact
’
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25.
‘
Fig. 4_ is a transverse vertical section through .
thecover, taken along the line 4--4 of Fig. 3; . 30
Fig. 5 is a longitudinal vertical section through
-the closure andtank fragment, showing the cover
_in open position;
.
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Fig-'6 is a similar sectional view showing _the
’cover automatically held in sealing position after 35
havingbeen closed by gravity; and '
;
Fig.- 'I is another similar sectional view showing
the cover finally locked in sealed position by the
'manual latching device.
\
It is a moreespeciflcobiect of my present in
'
Fig. 3 is a transverse vertical section through
the closure latching mechanism, taken along the
_
l
` While the improvement has been shown and 40
described herein as being specifically applied to
a closure for liquidtransporting truck tanks,l it ‘
and durable in construction, is also iiexible and _ is not the’intent to thereby unnecessarily restrict
the scope 'of the invention, sincesome of the
45 highly
Another
eiiicient
specific
in operation.
object of this invention is the ». novel features of closure assembly may obviously 45
__
s
provision of> improved cover structure which will' be more generally applied.
Referring to the drawings, the improved closure
_insure automatic closing and sealing o_f the cover `_
'if the` same has accidentally been left open. land assemblage comprises in general a manhole lring
i0 .welded or otherwise rigidly „attached to the \
_ when the receptacle is set in motion. _"
A _furthenspeciilc' object lof `the invention is to upper portion of a _vehicular tank- or receptacle '50 '
provide a closure mechanism which 'is readily ali ‘ II- and having a central opening _I2 surrounded
.iustable so as to insure tightsealingat all times by an annular upperLresilient sealing strip lj; _ I
and under -various-conditions of use, and "wherein a main leverI Il' swingably attached to the front
the closure cover is adapted. tov be effectively
55flocked'insealingl position.
A
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side vof- the ring I0 by means of a pivot pin I6 L
£coacting with ears 'I8 formed integral with the¢55a
2
2,108,238
ring I8; a closure plate or cover I1 pivotally sus
7,_ until an arm 38 formed integral with one of
pended from the medial portion of .the lever I4
the cams 28 engages the opposite face of the lug
31 asillustrated in Fig. 5. The cams-28 are thus
adapted to engage the stationary latching pin 22
by means of a pivot pin I8 and having a seating
lip I9 cooperable with the sealing strip I3 when
the cover is closed; a. pair of movable cams 28
pivotally attached to the swinging end of the
main lever I4 by a pivot pin 2I; a latching-pin
22 carried by ears 23 formed integral lwith the
rear portion of the manhole ring I8 and coop
10 erable with the cams 28 when the cover I1 is
closed by gravity; and a locking and release le
ver 24 swingably supported by the latch pin 22.
whenever the lever I4 is swung toward closing
position about its pivot pin I5, and during such ,
closing movement the cams 28 _are thrown for
wardly by -the pin 22 until they clear this pin,
after which the spring 38 quickly becomes ef
fective to snap the cam surface 39 beneath the
pin 22 into latching- position. ,'The eccentric
sleeve 33 obviously permits >adjustment of the pin
and cooperable with the swinging end of the 2I and cams 28 so as to insure most effective co
action between the cam surfaces 39 and the
main `lever I4 and with the cams 28 to inter
l latching pin 22 at all times, and especially when
15 changeably lock and release the cover I1.
The main frame or ring I8 may be formed by the sealing strip I3 becomes compressed through
casting or otherwise and is preferably welded to
an inwardly directed ñange of the receptacle Il
as shown, in order to avoid outward projection
of the ring beyond the contour of the tank; and
while the exterior of the ring I8 may- be elliptical
in shape, the opening I2 is ordinarily circular;
continued use.
'
The locking and release lever 24 which is swing- l
ably supported by the normally fixed latching
pin 22 between the ears 23, is rigidly attached to 20
the _pin 22 and has an integral locking cam 48
provided with a notch 4I, the former of which
The annular sealing-strip I3 is confined within ` is adapted to ride over the sleeve 33 and the lat
a recess in the ring I8, and .may be formed of ter of which is'formed to finally engage this sleeve
25 any suitable sealing material such as cork or So as to hold the main lever I4 in closure sealing 25
rubber composition. The upstanding ears I6, position. As the lever 24 is swung about the axis
423 at the front and rear ends of the ring- I8 are of the pin 22, the pin is rotated in the ears 23,
preferably either formed integral therewith or and one end of the pin 22 carries a cam release
rigidly attached thereto, and the normal forward arm 42 which is adapted to engage the rear edge
30 direction of transportation of the tank or recep
tacle II is indicated by the arrow in Fig. 5.
The main cover` suspension lever I4 which is
swingably attached to the frame ring I8 by means
of the plvotpin l5, is of strong and durable con
35 struction; and has means such as an adjustable
set screw l25 cooperable with a lug 28 projecting
laterally from one of the fixed ears I8, for lim
`iting the extent of the opening movement of the
lever I4. The suspension pin I8 for the closure
40 cover I 1 is guarded against damage _by a shield 21
formed integral with the lever I4, and the pivot
pin I8 is Vrotatably adjustable in the opposite sides
of one of the cams 28 so as to swing these cams 30
and their pivot pin 2| in a clockwise direction to
_the position shown in Fig. 2_ in order to permit
free upward swinging of the main lever I4 and
closure I1. The arm 42 is rigidly but adjustably
secured to the end of the latching pin 22 by means
»of a set screw43, and when the closure cover I1
and the lever I4 are lowered by gravity, the ad-`
jacent cam 28 will engage the arm 42 so as to
jswing the same out ,of the way- sumciently to per
lz'xìit the‘ca'm- surfaces 39 to engage the latch -pin
When the improved closure assemblage has
of the lever I4 and coacts with ears 28 on the been properly constructed and assembled as above
_closure I1" through an eccentric sleeve 29 which described, and theset screwv 25 and eccentric
45 is secured to the pin I8 b'y a dowel pin 38. The ' sleeves 29, 33 have been properly a/djustedvand 45
pivot pin I8 is adapted to be locked in adjusted
locked in position, the closure is adapted for
vpositionrelative to the lever I4 by means of a
normal use. With the assemblage positioned as
shown in Figs. l and 2, the locking andrelease '
set screw 3l. and is rotatable to angularly adjust
the sleeve 29 by means ofa screw driver or a
'50. bladel applied to the slotted end of the pin I8.
The cover or closure I1 may thus be shifted rel
ative to the' lever I4 so as to insure proper co
lever 24 has been positioned so as to bring the
arm '43 into engagement with the adjacent cam 28
and to compress the spring 38 sufficiently so that
the rear ends of the cams 28 will clear the latch
action of the lip I9 with the sealing strip I3 when ing pin 22. The main lever I4 and closurev I1
the lever I4 is in clamping position. The closure _ may then be swung into open position as clearly
55 I1 is oi' circular formation and is provided with shown in Fig. 5, without obstruction,` whereupon 55
a central vent ~32, the outlet opening of which is >the set screw -25 will engage the lug 28 and will
retain the lever I4 and closure I1 ‘in open posi
also guarded by the shield 21.`
,
‘ i
The automatic latching cams A28 are rigidly tion. At such time,` the- arm 38 of the latching
attached to their pivot and supporting pin 2|, cam 28 will engage the adjacent face of the lug
60 and this pivot pin is rotatably journaled in an 31 by virtue of the action of the coil spring 38.
‘If it becomes desirable to close the manhole
eccentric sleeve 33 which coacts with transverse
alined bores in the swinging end -of the main
cover, or ii' the vehicle is set in forward motion.
lever I4. The sleeve 33 snugly nts these bores
and is adapted. to be locked in adjusted position
the main lever I4 will swing about its supporting
65 by means ofA a set screw 34 as shown in Fig. 3,
and the sleeve 33 is provided with a hole 35 with
« in which a lever pin may be inserted to effect
angular adjustment of the sleeve when the lock
ing screw 34 is released. One end of the cam
70 supporting pin 2l is provided with a coil spring
36 which Vcoac'ts with the pin and with one face
of a lug 31 formed integral -with the main lever
I4,- in such manner that the pin 2l and cams 28
v`are constantly caused to swing in a counter-l
75 clockwise vdirection as viewed in Figs. 2, 5, 6 and
pivot I5 suiliciently to bring the center of gravity
of the lever and cover assemblage beyond the aile
of the pin I5, whereupon the swingable assent-f
blage will drop by gravity'toward closing position.
ct
As the cam 38 passes the adjacent release arm 42,
the lever 24 will be swung upwardly a slight
amount, and the cam surfaces 38 will thereafiär 70
be swung beneath the latching pin 22 by the coll
spring 38 which is slightly compressed when the
cams 28 initially pass the pin 22. The spring 38
thereafter immediately becomes effective -to vswing
the cam surfaces 33 beneath the pin 22 as shown 75
9,168,233
in Fig. 6. thus forcing the lip I9 of the closure I1
into intimate engagement with the sealing strip
I8. The closure> I1 is thus initially latched into
closed position, by the automatic .action of the
cams 20,and of the spring 3.6. In order to finally
lock the closure I1 into sealed position as shown
in Fig. 7, it is only necessary to swing thev lever
24 forwardly. During the initial forward motion
the arm 42 is retracted from the camsßli and the
10 outer surface of thecam’4il engages the eccentric
sleeve 33, and when the lever 24 isV broughtinto
final sealing position, the notch M >engages the
sleeve 33 and positively locks the lever I4 in clos
ing position. In order to bringthe mechanism
3
said opening, automatically functioning means
for holding said closure in sealing contact with
said receptacle when said closure is swung toward
said opening, and manually operable means for
subsequently locking said closure in sealing posi
tion, said manually operable means being manip
ulable to release said automatic holding means.
3. In combination, >a receptacle having an '
opening surrounded by a seal, a closure pivotally .
attached to said receptacle and being swingable
by gravity toward said seal, automatically func
tioning cam means for frictionally clamping said
closure ln contact _with said seal when said closure
is swung bygravitytoward said opening, and a
manually operable lever for subsequently finally
lclamping and locking said closure against'said
swing the lever 24 rearwardly about the axis of . seal, said manually operablemeans being mov
15 into the position sho-wn in Fig. 2 sov as to permit
¿openingnof the closure i1, it is only necessary to
`the latch pin 22, whereupon the arm it again .
able to release said cam means. ‘
,
il. In combination, a receptacle having' an
In order to insure _tight sealing of the closure opening and a compressible seal adjacent said 2,0
20.
il, itis necessary to properly locate the closure opening, a lever pivotally attached to said re
ceptacle and swingable over said opening, a
i1 relative to the main lever iii,.and to also prop
erly locate the cams 2b relative tothe latch pin Y closurey pivotally suspended from the medial por
tion of said lever, an adjusting eccentric inter
22. "The sleeve 29 may obviously be readily ad
justed upon release of the set screw 3i, and the posed between said closure and said lever, a
pin I8 and sleeve 29 may be thereafter angularly latching cam pivotally suspended from the
adjusted so as to insure proper positioning of swinging end of said lever, andV an adjusting
the closure il relative to the lever Iâ. The cams eccentric interposed between said` cam and said
becomes effective'as above described.V
2li may likewise be properly positioned by merely
30 releasing the set screw dii and by subsequently
applying an adjusting rod to the hole £5 in the
sleeve iid. The extent of opening movement of
. the closure I1 may .also be varied by adjustment
lever.
i
,
.
5. In combination, a receptacle having an open 30
ing and a compressible seal adjacent said open
ing, a lever pivotally _attached to said receptacle
and swlngable over said opening, a closure piv
otally suspended from the medial portion of said
35 this opening movement if closing of the cover is ' lever, an adjusting eccentric interposed between at4
to be eil'ected by inertia when the _tank ii is said closure and said lever, a latching cam piv
otally suspended from the swinging end of `saldi
displaced forwardly.
`
lever, an adjusting eccentric interposed between
From the foregoing description it will be ap
said cam _and said lever, and a latch pin at
parent that the present invention provides an ex
tached to said receptacle and cooperable with 4:0
40 tremely simple mechanism ' for automatically
oi' the set screw 25, but it is preferable to .limit
closing and latching a cover in closed position. - said cam to hold said closure in contact with
The invention furthermore provides simple means
tor positively locking the cover in sealed position,
and also provides simple mechanism for eifecting
45 adjustment so as to insure tight sealing under
all conditions of operation. The improved
mechanism is extremely compact and is well
adapted to augment, rather than to detract from,
the streamlined appearance of a vehicular tanl:`
50 to whichit may be applied, and the assemblage
vis extremely durable _in construction, in spite of its
being relatively iight in'structure. The improved
closure mechanism is highlyA effective in opere.
55
-co
,66
said seal.
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6. In combination, a receptacle having an open
ing and a seal ladjacent said opening, a main
lever swingabie over said opening, a closure ad 45
justably-suspended from the medial portion oi.’
said lever and cooperable with said seal, a cam
pivotally suspended from the swinging end of
said lever, a latch plncarried-by said receptacle
and cooperable with said cam to temporarily hold'
said closure in contact with said seal, and a lock
tol
ing lever carried by said latch pin and cooper
able with said main lever to positively lock said
`
tion, and can be manufactured -and installed at ' closure in sealed position.
. ‘7. ‘In combination, a receptacle having an open
relatively moderate cost. f
.
‘Y
55
It should be understood that it is not desired ing and` a seal adjacent said opening, a main
to limit the present invention to the exact detiiils` lever swingable over said opening, a closure sus
of construction and to the precise mode of use pended from the medial portion of said lever and
conperable with said seal. a cam pivotally sus- '
herein shown and described, for various modiilca
tions within the scope of the claims may occur pended from the swinging end of said lever, a 60
latch pin rotatably mounted upon said receptacle
to persons skilled in the -art.
and engageable with said cam to temporarily hold
I claim:
‘
.
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- 1. In combination, a. receptacle having an said closure against said seal, and a locking cam.
secured to saidlatch pin and cooperable with
opening, a closure pivotally attached to said re
ceptacle and swingable toward and away from said main lever to finally lock said closure in 65
said opening, automatically functioning means
sealed position.
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for holding said closure in sealing contact with
saidv receptacle when said closure is swung to
ward said opening, and' other means for subse
8. In combination, a receptacle having an open
ing and a seal adjacent said opening, a main lever
swingable across said opening, a- closure sus
70 quently finally locking said closure in vsealing
position, said other means being- movable to re
léase said automatic holding means.
2. In combination, a receptacle having an
seal, a cam -pivotally suspended from the swinging
end of said lever, an adjustable eccentric adja
cent said cam, u_latch pinA rotatably mounted
opening, a closure pivotally attached to said
pended from said lever and cooperable with said
upon said receptacle and adapted to be engaged
by said cam to temporarily hold said ïclosure l
75 receptacle and swingable toward and away from i
4E
2,108,238
against said seal, and a locking cam carried by
closure adjustably suspended from said lever and _
said latch pin and cooperable withsaid eccentric>
cooperable with said opening, a pair of cams
pivotally suspended from said lever, resilient
to ñnally'lock said closure in sealed position.
9. In combination, a receptacle having an open-v
ing, a main lever swingable by gravity across said
means for urging said cams in one direction, a
latch member cooperable with said cams to auto
opening, a closure for said opening suspended _ Amatically hold said closure in sealing position
from said lever, a pair of cams‘pivotally sus
relative to said opening, anda locking member '
pended from the swinging end of said lever, an cooperable with said lever between said cams i'or
adjustable eccentric carried by said lever between Ivfinally positively locking said closure in _sealedA
10
said cams, a latch pin adapted to be engaged by
said cams to temporarily conhne said closure over.
position.
'
10
12. In combination, a receptacle having an
said opening, and a, locking cam cooperable with
said eccentric to positivelyvlock said closure in
opening and a seal adjacent said opening, a main
lever pivotally suspended from said receptacle on
sealed - position.
one side oi*v said opening and swingable there
10. In , combination, a receptacle having an . over, a closure adjustably suspended 'from the
opening, a main lever pivotally'suspended from medial portion ot said lever and cooperable with
said receptacle and swingable over said opening, said seal, a pairof cams pivotally suspended from
a closure adjustably suspended from the medial the swinging end of said lever, resilient means
portion of said lever and cooperable with said for urging said cams in one direction about their
opening, a pair of spaced cams pivotally sus
pivotal axis, an adjustable eccentric supported 20
pended from the swinging end oi said lever, an by said lever between said cams, a latch pin car
adjustable eccentric carried by said lever be
ried by said receptacle and cooperable with said
tween said cams, a latch member carried by said cams to automatically retain said closure in con
receptacle and cooperable with said cams to tem
tact with said seal, a locking cam carried by said
porarily hold said closure in contact with said -latch pin and cooperable with said eccentric to
‘ receptacle adjacent said opening, and a locking
positively lock said closure in sealed position,
cam carried by said receptacle and cooperable
with said eccentricto positively lock said closure
and a releasing arm carried by said Alatch pin
_and cooperable with said automatic holding cams
in sealed position.
to release the same from holding position.
"
11. In combination, a receptacle having' an
opening, a lever swingable across said opening, a
HENRY A. sTRlELow'.
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