US3744670A - Combination manhole and fill - Google Patents

Combination manhole and fill Download PDF

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Publication number
US3744670A
US3744670A US00132991A US3744670DA US3744670A US 3744670 A US3744670 A US 3744670A US 00132991 A US00132991 A US 00132991A US 3744670D A US3744670D A US 3744670DA US 3744670 A US3744670 A US 3744670A
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United States
Prior art keywords
strongback
latch arm
aperture
fill
cover
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Expired - Lifetime
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US00132991A
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English (en)
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Frees J De
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DEFREES BARBARA BALDWIN WIDOW OF JOSEPH H DEFREES DEC'D
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FREES J DE
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Publication of US3744670A publication Critical patent/US3744670A/en
Assigned to DEFREES, BARBARA BALDWIN; WIDOW OF JOSEPH H. DEFREES, DEC'D reassignment DEFREES, BARBARA BALDWIN; WIDOW OF JOSEPH H. DEFREES, DEC'D ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DEFREES, BARBARA B., JOINT EXECUTOR-EXECUTRIX OF THE ESTATE OF JOSEPH H. DEFREES, DEC'D, DEFREES, CHARLES W.S.
Assigned to DEFREES, CHARLES W.S., DEFREES, BARBARA BALDWIN reassignment DEFREES, CHARLES W.S. LETTERS OF ADMINISTRATION (SEE DOCUMENT FOR DETAILS). Assignors: DEFREES, JOSEPH H., DEC'D.
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Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J13/00—Covers or similar closure members for pressure vessels in general
    • F16J13/16—Pivoted closures
    • F16J13/20—Pivoted closures mounted by mobile fastening on swinging arms

Definitions

  • a manhole closure means for sealing a tank manhole aperture including an elongated strongback carrying a fill cover on its underside for covering a fill aperture in the closure means, such strongback being hinged to the manhole closure means at one side of the fill aperture for swinging movementover and onto the fill aperture in closed position.
  • An elongated latch arm is hinged to the manhole closure means adjacent the fill aperture in a position opposite the strongbackfor swinging movement toward and away from the strongback.
  • the latch arm has its hinged end bifurcated forming an opening in which the free end of the strong-back is received.
  • a transversely disposed downwardly extending ridge Positioned on the underside of the latch arm adjacent the inner edge of the latch arm opening is a transversely disposed downwardly extending ridge.
  • the strongback has at least one transverse recess formed in its top side adjacent its free end for receiving the latch arm ridge when the strongback free end is inserted in the latch arm opening, thereby firmly and securely locking the strongback and its fill cover over the fill aperture in closed position thereby effecting an over-center mechanism that prevents the till cover from opening inadvertently due to impact or shock.
  • the fill cover may also include a springwell and an annular gasket clamped between a cover disc and a gasket retainer, with the cover disc being threaded to the springwell.
  • the fill cover may also include an integral springwell and a dovetail gasket carried in an undercut groove.
  • the fill cover may also omit the springwell and secure resilient action by means of a resilient Belleville disc included in the fill cover structure. This resilient action is adequate for latching purposes, but not adequate for venting.
  • the invention is particularly applicable to tanks containing flammable liquids.
  • such tanks are mounted on vehicles such as highway tank trucks.
  • government regulations require emergency venting to handle rapid, excessive pressure build-up within the tank such as occurs from a fireand which cannot be handled by the normal vents. This rapid, excessive pressure build-up is more dangerous than fire for an explosion or a rupture in the tank may result, accompanied by spreading of fire in the form of a flaming liquid.
  • a further object of the invention is to provide a tank fill cover latching mechanism having an over-center action in which work (force x distance) must be performed to release the latch.
  • a further object of the invention is to provide a tank fill cover that is relatively safe to open when the tank contains pressure.
  • a further object of the invention is to provide a tank fill cover latching mechanism that neither depends on friction nor on an interlock to function.
  • a further object of the invention is to provide a tank fill cover of the above type that is simple in construction, economical to manufacture and highly effective in operation.
  • a further object of the invention is to provide a fill cover latch mechanism that is safe, reliable, and will not jar open due to shock as might occur in an accident.
  • the invention relates to a combination fill and manhole closure means.
  • the closure means includes a fill aperture.
  • the closure means also includes an elongated planar strongback hinged atone end to the manhole closure means at one side of the fill aperture for swinging movement in a vertical plane over the till aperture.
  • the strongback has a fill cover on its underside for selective sealing engagement with the fill aperture when the strongback is swung over the fill aperture to a closed position.
  • the closure means also includes an elongated substantially planar latch arm hinged at one of its ends to the manhole closure means at the opposite side of the fill aperture for swinging movement in the aforementioned vertical plane toward and away from the strongback.
  • the latch arm has its oneend (hinged end) bifurcated forming an opening for receiving the free end of the strongback therethrough.
  • the latch arm has an elongated ridge transversely disposed on its underside adjacent the inner edge of the opening.
  • the strongback has an elongated transverse recess formed in its top side adjacent its free end for receiving the ridge therein when the strongback free end is inserted in the latch arm opening, thereby locking the strongback and its fill cover over the fill aperture in closed sealed position when the latch arm is positioned over the strongback in closed position.
  • the ridge may be a hook portion, a flange, or an elongated cylindrical
  • the strongback has a second elongated transvers recess formed in its top side parallel to the first recess and disposed adjacent the free end of the strongback outwardly of the first recess.
  • the second recess forms a secondary latch or safety stop for receiving the latch arm ridge when the latch arm is manually disengaged from the first recess, thus partially removing the fill cover from the fill aperture to relieve unexpected internal pressure.
  • An inclined camming surface is interposed between the recesses to provide facile movement of the latch arm ridge from one recess to the other.
  • the ridge becomes disengaged from the first recess manually and not from pressure interiorly of the tank.
  • the second recess should not engage the ridge unless interior pressure is present, thus causing the fill cover to be urged upward.
  • the secondary latch is provided so that the operator will notbe injured if pressure is present in the tank at time of opening. If the secondary latch were not provided, the fill cover could be violently opened by internal pressure with possible harm to the operator. Large volumes of gas also would become a hazard. If there is no internal pressure present, the latch arm swings clear and no engagement is encountered'with the secondary latch.
  • the latch arm is of elongated rectangular configuration in plan, with such latch arm having a handle for manual grasping on the free end. thereof.
  • the fill cover is formed of an annular gasket retainer of lesser diameter than the fill aperture, an annular disc of greater diameter than the fill aperture and spaced from and disposed above the gasket retainer, and an annular gasket of greater diameter than the fill aperture and interposed between the retainer and the disc in clamped relation, whereby the gasket contacts the periphery of the fill aperture and the disc imparts a semiresilient sealing action to the fill cover when it is clamped on the fill aperture.
  • a springwell disposed centrally on the cover, with the disc being threadedly secured to or formed integral with the springwell.
  • the springwell is an integral part of the fill cover or the springwell may be omitted.
  • the springwell has a vertical bore open at the top, and the strongback has a sleeve fitting on its underside and which extends partially into the top of such bore.
  • a coil spring is disposed in the bore and is compressed between the bottom wall of the spring-well and the sleeve fitting, thereby imparting a resilient clamp effect to the fill cover when it is locked over the fill aperture.
  • the invention provides a tank manhole closure and fill cover having venting means for venting unex pected internal pressure-when the fill cover is opened manually, such fill cover having a resilient clamping effect when locked over the tank opening, thus functioning like a giant safety valve.
  • the secondary recess forms a safety stop to prevent further opening of the fill cover and thereby provides protection to the operator if pressure is present in the tank.
  • the present latch is shock resistant, safer, maintains adjustment (less wear), is less apt to disengage and open, and provides a much more reliable and positive action.
  • Such latch includes camming surfaces the geometry of which provides a clamping action which compresses the gasket on the fill cover and insures a tight seal. The latch neither depends on friction nor on an interlock to function, but rather to an overcenter action in which work must be performed to effect unlatching.
  • the resiliency of the lid with or without coaction with the springwell effects an emergency venting feature of the cover C to relieve excessive pressure interiorly of the tank due to fire exposure.
  • FIG. 1 is a side elevational view, partly in section, of a tank combination manhole and fill cover of the invention and showing, in dot-dash lines, such fill cover in open position, and showing the latch arm in various perative positions;
  • FIG. 2 is a top plan view of the fill cover shown in FIG. 1;
  • FIG. 3 is a side elevational sectional view of a modification of the latch arm of the fill cover shown in FIG.
  • FIG. 4 is a view similar to FIG. 3, but showing a modification thereof;
  • FIG. 5 illustrates a modification of the device shown in FIG. 1;
  • FIG. 6 illustrates a further modification of the device shown in FIG. 1.
  • FIGS. 1 and 2 there is shown a tank combination manhole and fill cover closure means of the invention, generally designated as A, and disposed on a liquid storage tank T.
  • the tank T contains in its upper portion, a manhole opening defined by an endless, annular, peripheral ring or collar 10 projecting upwardly from the tank.
  • an annular manhole closure 14 Secured to the upper end of the collar 10 by means of the clamping ring 11 (FIG. 2), clips 12, and bolt 13 is an annular manhole closure 14, having an inner, peripheral, annular curb 15 forming a seat for the closure means A, such annular curb 15 also defining a fill aperture 16.
  • hinge lugs 20 Disposed on one side of the aperture 16 are hinge lugs 20. Hinged to the lugs 20 by means of the pin 21 is an elongated, planar, lock arm or strongback 22.
  • the strongback 22 carries on its underside a fill cover, generally designated as C, which will later be described in detail.
  • a first recess 24 Formed in the outer end portion of the strongback 22 is a first recess 24, which merges outwardly into a camming surface or projection 25, such surface ending with a second recess or secondary latch 26.
  • the surface 25 includes an inclined camming surface 25a extending to the recess 26, and an inclined camming surface 25b extending to the recess 24.
  • an attach fitting 28 Secured centrally to the strongback 22 is an attach fitting 28 having a central vertical bore 30 in which is disposed a bolt 32.
  • the lower end of the bolt 32 passes through a bore 34 in springwell 36 such that tightening of the lock nut 38 on the bolt 32 draws the springwell upwardly toward the fitting 28, such fitting being telescoped into the springwell bore 40.
  • a compressed coiled spring 42 is disposed in the bore 40 and is compressed between the fitting 28 and the floor of the springwell 36.
  • the cover C is threaded onto the spring well 36 as shown.
  • the fill cover C includes a gasket 50 which is sandwiched or clamped between a metal gasket retainer 52 and a metal disc 54 which is threaded onto the springwell 36, whereby the retainer 52 is clamped against the springwell flange 56.
  • a vent 60 is secured to the fill cover C, such vent, per se, forming no part of the present invention and is described in detail in U.S. Pat. No. 3,302,658.
  • hinge lugs 64 Disposed adjacent the fill aperture 16 opposite the lugs 20, are hinge lugs 64. Hinged to the lugs 64 by means of a hinge pin 66 is an elongated rectangular latch arm 68 having a handle 69 on its free end.
  • the hinged end of the latch arm 68 is bifurcated to providean opening 70 for receiving the free end of the strongback 22 therethrough.
  • the latch arm 68 has an eloncess 2d, thence cam over the camming surfaces 25b, 25 and 25a, and lock into the secondary latch or recess 26, thereby preventing the fill cover from opening further and also providing a controlled or limited vent for release of pressurized fluids.
  • the fill cover may be fully opened only when pressure in the tank is exhausted.
  • the latch includes the camming surfaces 25a and 25b the geometry of which provides an over-center action effecting a clamping action which compressed the gasket 50 and insures a tight seal.
  • Such latching device neither depends on friction nor an interlock to function, but rather to an over-center action in which work must be performed by the operator before unlatching can be effected and it would function perfectly even though the camming surfaces 25a, 25b were frictionless.
  • the present latch mechanism is more reliable, safer, and much less apt to open due to shock resulting from an accident.
  • the secondary latch is provided so that the operator will not be injured if internal pressure is present in the tank at time of opening. If this secondary latch were not provided, the fill cover C would be violently opened to the full opened position with possible harm to the operator. Also, large volumes of gas would become a hazard. If there is no internal pressure present, latch arm 68 swings clear and no engagement with secondary latch 26 is encountered.
  • gated transverse recess 24 formed in its top side adjacent its free end for receiving the ridge 72 therein when the strongback free end is inserted in the latch arm opening 70, thereby locking the strongback and its fill cover C over the fill aperture 16 in closed sealed position when the latch arm 68 is positioned over the strongback in closed position.
  • the strongback 22 has a second elongated transverse recess 26 formed in its top side parallel to the first recess 24 and disposed adjacent the free end of the strongback 22 outwardly of the first recess 24.
  • the second recess 26 forms a secondary latch or safety stop for receiving the latch arm ridge 72 when such ridge is disengaged from the first recess24, when internal pressure is present;
  • the camming surfaces 25a, 25 and 25b are interposed between the recesses 24, 26 to provide facile movement of the latch arm ridge 72 from one recess to the other.
  • the pair of strongback hinge lugs 20 secured to the manhole closure '14 at the one side of the fill aperture 16.
  • the hinged end of the strongback is bifurcated, with such bifurcated end being hinged to such strongback hinge lugs 20.
  • a pair of latch arm hinge lugs 64 are secured to the manhole closure plate 14 at the opposite side of the till aperture 16, with the bifurcated end of the latch arm 68 being hinged to the latch arm hinge lugs 64.
  • the latch arm 68 is of elongated rectangular configuration in plan, and has the handle 69 for manual graspr ing of the free end thereof.
  • the ridge 72 is formed by a downwardly extending elongated transversely disposed hook portion formed in the latch arm 68 adjacent the inner edge of the latch opening 70.
  • FIG. 3 illustrates a modified latch arm 68a having a ridge in the form of an elongated cylindrical pin 80.
  • FIG. 4 illustrates a modified latch arm 68b having a ridge in the form of downwardly extendingtranversely disposed flange 82.
  • the invention provides a tank manhole closure means A for selectively sealing a fill aperture 16 in a liquid containing tank T including an elongated planar strongback 22 hinged at one end to the tank T at one side of the fill aperture 16 for swinging movement in a vertical plane over and onto the fill aperture
  • the strongback has a fill cover C on its underside for selective sealing engagement with the fill aperture 16 when the strongback is swung over the fill aperture to a closed position.
  • An elongated substantially planar latch arm 68 is hinged at one of its ends to the manhole closure 14 at the opposite side of the fill aperture 16 for swinging movement in such vertical plane toward and away from the strongback 22.
  • the latch arm has its one end bifurcated forming an opening 70 for receiving the free end of the strongback 22 therethrough.
  • the latch arm 68 has an elongated depending ridge 72 trans versely disposed on its underside adjacent the inner edge of the opening 70.
  • the strongback 22 has an elon-
  • the fill cover C includes the annular gasket retainer 52 of less diameter than the fill aperture 16, an annular disc 54 of greater diameter than the fill aperture 16 and spaced from and disposed above the gasket retainer 52, and an annular gasket 50 of greater diameter than the fill aperture 116 and interposed between the retainer 52 and the disc 54 in clamped relation, whereby the gasket 50 contacts the seat or periphery 15 of the fill aperture 16 and the disc 54 imparts a semi-resilient sealing action to the fill cover C when it is clamped on the fill aperture 16.
  • fill cover C will lift off the seat 15 to relieve such pressure.
  • the springwell 36 disposed centrally on the fill cover C, the disc 54 being threadedly secured to the springwell.
  • the springwell 36 has a vertical bore 40 open at the top.
  • the strongback 22 has a sleeve fitting 28 on its underside which extends partially into the top of the bore 40.
  • a coil spring 42 is disposed in the bore 40 and is compressed between the bottom wall of the springwell and the sleeve fitting 28, thereby also imparting a resilient clamping effect to the fill cover C when it is locked over the aperture 16.
  • the latch of the invention is shown in combination with a fill cover C having a centrally disposed springwell 36, such cover including the gasket retainer 52, the disc 54, and the gasket 50 clamped therebetween as aforementioned.
  • the latch of the invention is shown in combination with a fill cover C-l (similar in construction to cover C) without a springwell., but with a vent valve
  • the latch of the invention is shown in combination with a fill cover C-2 of single plate construction andhaving a dovetail gasket 90 attached to the periphery thereof.
  • the cover C-2 has a springwell 36a secured centrally thereto and a vent 60b disposed between the springwell and the periphery of the fill cover.
  • the fill cover C may or may not include a spring-well. If the springwell is included it may be threaded on the fill cover as shown in FIG. 1, or formed integral with the fill cover as shown in FIG. 6.
  • the fill cover may omit the springwell and effect resilient action of the cover by means of a resilient Belleville disc 84 as shown in FIG. 5. Such resilient action is adequate for latching purposes, but not for venting.
  • a tank manhole closure means for selectively sealing a fill aperture therein comprising, an elongated planar strongback hinged at one end to the manhole closure means at one side of the aperture for swinging movement in a vertical plane over the aperture, said strongback having a fill cover on its underside for selective sealing engagement with the aperture when the strongback is swung over the aperture to a closed position, and an elongated substantially planar latch arm hinged at one of its ends to the tank at the opposite side of the aperture for swinging movement in said vertical plane toward and away.
  • said latch arm having its one end bifurcated forming an opening for receiving the free end of the strongback therethrough, said latch arm having an elongated depending ridge transversely disposed on its underside adjacent the inner edge of the opening, said strongback having an elongated transverse recess formed in its top side adjacent its free end and extending below the surface of such top side for receiving said ridge therein when the strongback free end is inserted in the latch arm opening thereby locking the strongback and its cover over the fill aperture in closed sealed position when the latch arm is positioned over the strongback in closed position, the entrance surface of said recess being an inclined convex curved camming surface on which the ridge slides and is thus cammed into the recess, said latch arm ridge comprising a downwardly extending elongated transversely disposed hook portion formed in' the latch arm adjacent the inner edge of the latch arm opening.
  • said strongback has a second elongated transverse recess formed in its top side parallel to the first-named recess and disposed adjacent the free end of the strongback outwardly of the first-named recess, said second recess forming a safety stop for receiving said latch arm ridge if such ridge becomes disengaged from the first-named recess.
  • said cover includes an annular gasket retainer of lesser diameter than the aperture, an'annular disc of greater diameter than the aperture and spaced from and disposed above the gasket retainer, and an annular gasket of greater diameter than the aperture and interposed between the retainer and the disc in clamped relation, whereby the gasket contacts the periphery of the aperture and the disc imparts a semi-resilient sealing action to the cover when it is clamped on the aperture.
  • a tank manhole closure means for selectively sealing a fill aperture therein comprising, an elongated planar strongback hinged at one end to the manhole closure means at one side of the aperture for swinging movement in a vertical plane over the aperture, said strongback having a fill cover on its underside for selective sealing engagement with the aperture when the strongback is swung over the aperture to a closed position, and an elongated substantially planar latch arm hinged at one of its ends to the tank at the opposite side of the aperture for swinging movement in said vertical plane toward and away from the strongback, said latch arm having its one end bifurcated forming an opening for receiving the free end of the strongback therethrough, said latch arm having an elongated depending ridge transversely disposed on its underside adjacent the inner edge of the opening, said strongback having an elongated transverse recess formed in its top side adjacent its free end and extending below the surface of such top side for receiving said ridge therein when the strongback free end is inserted in the latch arm opening thereby locking the strong
  • a tank manhole closure means for selectively sealing a fill aperture therein comprising, an elongated planar strongback hinged at one end to the closure means at one side of the aperture for swinging movement in a vertical plane over the aperture, said strong- 9 I back carrying a cover on its underside for selective sealing engagement with the aperture when the strongback is swung over the aperture to a closed position, an elongated planar latch arm hinged at one of its ends to the closure means at the opposite side of the aperture for swinging movement in said vertical plane toward and away from the strongback, said latch armhaving its one end bifurcated forming an opening for receiving the free end of the strongback therethrough, said latch arm having an elongated ridge transversely disposed on its underside adjacent the inner edge of the opening, said strongback having an elongated transverse recess formed in its top side adjacent its free end for receiving said ridge therein when the strongback free end is inserted in the latch arm opening thereby locking the strongback and its cover over the aperture in closed sealed position

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
US00132991A 1971-04-12 1971-04-12 Combination manhole and fill Expired - Lifetime US3744670A (en)

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US13299171A 1971-04-12 1971-04-12

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US (1) US3744670A (enrdf_load_stackoverflow)
FR (1) FR2135944A5 (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055274A (en) * 1975-09-12 1977-10-25 Gesellschaft Fur Kernforschung M.B.H. Dual lid for closing coupled openings
US4181238A (en) * 1978-12-20 1980-01-01 Clay & Bailey Manufacturing Company Venting tank closure
DE3102525A1 (de) * 1980-02-04 1981-12-10 Emco Wheaton Inc., 44030 Conneaut, Ohio Sicherheitstankdeckel
USD271518S (en) 1981-04-08 1983-11-22 Gulf & Western Manufacturing Company Closure for a pressure device
USD272940S (en) 1981-02-02 1984-03-06 Johansson Tord G I High pressure cover
AT394702B (de) * 1985-05-09 1992-06-10 Linke Hofmann Busch Verschlusseinrichtung fuer behaelteroeffnungen, insbesondere fuer den dom auf schienengebundenen schuettgut- und kesselwagen
US5353945A (en) * 1992-09-22 1994-10-11 Nordson Corporation Thermoplastic material melting apparatus
DE19708848A1 (de) * 1997-03-05 1998-09-10 Wegmann & Co Gmbh Luke für ein gepanzertes Kampffahrzeug
US6109823A (en) * 1998-11-20 2000-08-29 Stebbins Engineering & Manufacturing Co. Method of converting existing tank access ways
US6446307B2 (en) * 1999-02-22 2002-09-10 Electromechanical Research Laboratories, Inc. Manway lid lifter
US6595716B1 (en) * 2000-09-15 2003-07-22 Delaware Capital Formation, Inc. Cam lever assembly for manhole center
US6679651B2 (en) * 2001-04-09 2004-01-20 The Stebbins Engineering And Manufacturing Company Method of converting existing negative pressure tank access ways
US6802429B1 (en) * 2000-08-25 2004-10-12 Premark Feg L.L.C. Floating lid assembly for a steam kettle
US20060037278A1 (en) * 2003-04-10 2006-02-23 Crane Stephen D Fluid containment vessel, method of constructing fluid containment vessel, in particular chemical-resistant concrete liquid containment vessel
US7160051B1 (en) * 2006-02-28 2007-01-09 Saint-Gobain Pam Closure device
CN108657675A (zh) * 2017-03-27 2018-10-16 艾默生过程管理调节技术塔尔萨有限公司 用于保护取样口的密封表面的装置
US20180339816A1 (en) * 2015-12-10 2018-11-29 Applied Materials, Inc. Closure or lock device for a vacuum chamber

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055274A (en) * 1975-09-12 1977-10-25 Gesellschaft Fur Kernforschung M.B.H. Dual lid for closing coupled openings
US4181238A (en) * 1978-12-20 1980-01-01 Clay & Bailey Manufacturing Company Venting tank closure
DE3102525A1 (de) * 1980-02-04 1981-12-10 Emco Wheaton Inc., 44030 Conneaut, Ohio Sicherheitstankdeckel
USD272940S (en) 1981-02-02 1984-03-06 Johansson Tord G I High pressure cover
USD271518S (en) 1981-04-08 1983-11-22 Gulf & Western Manufacturing Company Closure for a pressure device
AT394702B (de) * 1985-05-09 1992-06-10 Linke Hofmann Busch Verschlusseinrichtung fuer behaelteroeffnungen, insbesondere fuer den dom auf schienengebundenen schuettgut- und kesselwagen
US5353945A (en) * 1992-09-22 1994-10-11 Nordson Corporation Thermoplastic material melting apparatus
DE19708848A1 (de) * 1997-03-05 1998-09-10 Wegmann & Co Gmbh Luke für ein gepanzertes Kampffahrzeug
US6109823A (en) * 1998-11-20 2000-08-29 Stebbins Engineering & Manufacturing Co. Method of converting existing tank access ways
US6446307B2 (en) * 1999-02-22 2002-09-10 Electromechanical Research Laboratories, Inc. Manway lid lifter
US6802429B1 (en) * 2000-08-25 2004-10-12 Premark Feg L.L.C. Floating lid assembly for a steam kettle
US6595716B1 (en) * 2000-09-15 2003-07-22 Delaware Capital Formation, Inc. Cam lever assembly for manhole center
US20040109726A1 (en) * 2001-04-09 2004-06-10 Robinson Mark D. Manway and manhole particularly suited for negative pressure tank access ways
US6679651B2 (en) * 2001-04-09 2004-01-20 The Stebbins Engineering And Manufacturing Company Method of converting existing negative pressure tank access ways
US6966724B2 (en) 2001-04-09 2005-11-22 The Stebbins Engineering And Manufacturing Company Manway and manhole particularly suited for negative pressure tank access ways
US20060037278A1 (en) * 2003-04-10 2006-02-23 Crane Stephen D Fluid containment vessel, method of constructing fluid containment vessel, in particular chemical-resistant concrete liquid containment vessel
US7160051B1 (en) * 2006-02-28 2007-01-09 Saint-Gobain Pam Closure device
US20180339816A1 (en) * 2015-12-10 2018-11-29 Applied Materials, Inc. Closure or lock device for a vacuum chamber
CN108657675A (zh) * 2017-03-27 2018-10-16 艾默生过程管理调节技术塔尔萨有限公司 用于保护取样口的密封表面的装置
CN108657675B (zh) * 2017-03-27 2022-06-17 艾默生过程管理调节技术塔尔萨有限公司 用于保护取样口的密封表面的装置

Also Published As

Publication number Publication date
FR2135944A5 (enrdf_load_stackoverflow) 1972-12-22

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Date Code Title Description
AS Assignment

Owner name: DEFREES, BARBARA BALDWIN

Free format text: LETTERS OF ADMINISTRATION;ASSIGNOR:DEFREES, JOSEPH H., DEC D.;REEL/FRAME:004117/0381

Effective date: 19830127

Owner name: DEFREES, CHARLES W.S.

Free format text: LETTERS OF ADMINISTRATION;ASSIGNOR:DEFREES, JOSEPH H., DEC D.;REEL/FRAME:004117/0381

Effective date: 19830127

Owner name: DEFREES, BARBARA BALDWIN; WIDOW OF JOSEPH H. DEFRE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:DEFREES, CHARLES W.S.;DEFREES, BARBARA B., JOINT EXECUTOR-EXECUTRIX OF THE ESTATE OF JOSEPH H. DEFREES, DEC D;REEL/FRAME:004117/0378

Effective date: 19830201