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Hatch vent assembly

Info

Publication number
CA2059673A1
CA2059673A1 CA 2059673 CA2059673A CA2059673A1 CA 2059673 A1 CA2059673 A1 CA 2059673A1 CA 2059673 CA2059673 CA 2059673 CA 2059673 A CA2059673 A CA 2059673A CA 2059673 A1 CA2059673 A1 CA 2059673A1
Authority
CA
Grant status
Application
Patent type
Prior art keywords
passageway
vent
hatch
cover
member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA 2059673
Other languages
French (fr)
Inventor
Richard H. Dugge
William U. Casseau
John A. Krug, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ACF Industries Inc
Original Assignee
ACF Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B61RAILWAYS
    • B61DBODY DETAILS OR KINDS OF RAILWAY VEHICLES
    • B61D5/00Tank wagons for carrying fluent materials
    • B61D5/08Covers or access openings; Arrangements thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00Component parts, details or accessories for large containers
    • B65D90/10Manholes; Inspection openings; Covers therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00Component parts, details or accessories for large containers
    • B65D90/22Safety features
    • B65D90/32Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
    • B65D90/34Venting means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J13/00Covers or similar closure members for pressure vessels in general
    • F16J13/16Pivoted closures
    • F16J13/18Pivoted closures pivoted directly on the frame

Abstract

Abstract of the Disclosure A hatch cover assembly includes a vent passageway through a hatch cover for venting the interior of a railroad hopper car, or the like, to the environment. The hatch cover is held in closed position by a locking strap, and the vent passageway is located directly beneath the locking strap to help prevent rain and other environmental contaminants from passing through the vent passageway. An inexpensive baffle assembly is releasably clipped into the vent passageway beneath the locking strap and is comprised of a two piece molded plastic structure with a mesh screen held therebetween to further protect the vent passageway from contaminants.

Description

20~9~7~
sackaround of the Invention The invention relates to hatch vent assemblies and more particularly to a hatch cover vent assembly for use on covered hopper railway cars, and the like, used to carry various types of lading. Such railway cars typically have a number of hoppers into which lading is loaded through an opening or hatchway in the roof of the car. The hatchway is provided with a hatch cover, typically circular, which is adapted to be sealed in an airtight manner with a circular coaming at the top of the hatchway. In order to seal and latch the hatch cover in place there is typically provided a locking strap or arm which extends across the hatch cover to exert a downward force thereon and which can be locked to prevent tampering with the lading. In some cases, it is desirable to provide an air vent to the interior of the hopper car in order to prevent the build up of pressure differentials within the sealed hopper. These pressure differentials may develop due to temperature changes within the hopper during transport and other causes.
It is important that the vent be constructed in such a way as to prevent environmental containments from entering into ~
the hopper a-nd possibly ruining the lading. The most commonly encountered environmental contaminants are rain and snow;
however, wind borne solids such as plant seeds and insects must also be prevented from entering the hopper through the air vent.

DN 4329100~i5R

2~59673 It is well known to provide an air vent passage through a hatch cover of a hopper car. An example of such a prior art vent structure for a hopper car is shown in U.S. Patent No. 4,819,830. Other vent structures are shown in U.SO Patent Nos. 4,127,216 and 4,609,126.
The vent structures of the prior art have been somewhat complicated, bulky and relatively expensive to manufacture, since a great deal of metal materials are used to construct the vent.
Summary of the Invention It is an object of the invention to provide a hatch vent assembly which is simple and inexpensive to manufacture and which can be installed in a hatch cover in a facile manner.
It is another object of the invention to provide a hatch vent assembly which can be easily removed from the hatch for repair, cleaning or replacement.
It is a still further object of the invention to provide a hatch vent assembly which alleviates the possibility of environmental contaminants entering through the vent passageway, and which utilizes existing hatch structure as part of the protection against environmental contamination.
In one aspect the present invention provides a hatch cover assembly comprising: a hatch cover adapted to close a hatchway; a vent passageway through the hatch cover for venting the interior of the hatchway to the exterior of 20~9673 the hatchway; vent means communicating with the passageway for preventing environmental contaminants from passing through the baffle means and through the vent passageway; a locking strap moveable between a hatch cover closing and locking position and a hatch cover opening and unlocking position; and the vent passageway being located beneath the locking strap when the locking strap is in the hatch cover closing and locking position such that the locking strap further protects the vent passageway from environmental contamination.
In another aspect the present invention provides a hatch cover adapted to close a hatchway; a vent passageway through the hatch cover for venting the interior of the hatchway to the exterior of the hatchway; baffle means on the hatch cover communicating with the passageway for preventing environmental contaminants from passing through the baffle means and through the vent passageway; the baffle means including a top member and a bottom member;
the top member including a generally horizontal top wall means extending above the vent passageway, and the top member including vertical wall means extending downwardly from the top wall means; the top member vertical wall means including at least one horizontal passageway therethrough communicating ambient air with the vent passageway; the bottom member including at least one horizontal passageway therethrough communicating ambient air with the vent passageway; and the horizontal - 3a -passageways being located such that any horizontal straight line will not pass through both the top member horizontal passageway and the bottom member horizontal passageway.
In yet another aspect the present invention provides a hatch cover vent assembly comprising: a hatch cover adapted to close a hatchway; a vent passageway through the hatch cover for venting the interior of the hatchway to the exterior of the hatchway; baffle means communicating with the passageway for preventing environmental contaminants from passing through the baffle means and through the vent passageway: the baffle means including a generally horizontal top wall means extending above the vent passageway and a plurality of baffle walls for preventing direct horizontal linear movement of environmental contaminants from entering into the vent passageway; and the baffle means including clip means for engaging the hatch cover and for securing the baffle means to the hatch cover.
In more detail, a vent passageway is formed through the hatch cover. In a preferred embodiment, a simple injection molded plastic baffle structure, preferably formed of only two separable parts, is removably secured in the vent passageway by means of a unitarily formed clip structure. The baffle structure prevents rain and other environmental contaminants from passing into the hopper through the vent passageway, while - 3b -20~9673 a mesh screen member removably held within the baffle structure further ensures that solid contaminants will not pass through the vent passageway. Preferably the vent baffle structure is positioned in a protected area directly beneath the locking strap for the hatch cover, thereby utilizing the locking strap as further protection from enyironmental contamination of the lading through the vent passageway.
Preferably, the invention includes a hatch cover adopted to close a hatchway. A vent passageway is provided through the hatch cover for venting the interior of the hatchway to the exterior of the hatchway. A baffle structure communicates with the passageway for preventing environmental contaminants from passing through the baffle structure and through the vent passageway. A locking strap is moveable between a hatch cover closing and locking position and a hatch cover opening and unlocking position.
The vent passageway is located beneath the locking strip when the locking strap is in the hatch cover closing and locking position such that the locking strap further protects the vent passageway from environmental contamination.
The several objects and advantages of the present invention will become more readily apparent upon a reading of the detailed description of a preferred embodiment thereof in conjunction with the drawings wherein:

Brief DescriptionQ f the Drawin~s FIG. 1 is a top plan view of the mid-portion of a hatch cover vent assembly according to the present invention;
FIG. 2 is a cross sectional view of the hatch cover assembly taken along line 2-2 of FIG. 1;
FIG. 3 is a top plan view of a baffle vent assembly according to the present invention;
FIG. 4 is a front elevational view of the baffle vent assembly;
FIG. 5 is a side view taken along line 5-5 of FIG. 3;
FIG. 6 is a cross sectional view taken along line 6-6 of FIG. 3;
FIG. 7 is a cross sectional view taken along line 7-7 of FIG. 6;
FIG. 8 is an exploded side view of the baffle vent assembly;
FIG. 9 is a side elevational view showing the opposite side of a top member per se of the baffle vent assembly;
FIG. 10 is a bottom plan view of the top member per se;
FIG. 11 is a top plan view of the bottom member per se of the baffle vent assembly; and FIG. 12 is a side elevational view of the bottom member.
Detailed Description of a Preferred Embodiment With reference to the drawings, and FIGS. l and 2 in particular, there is shown a hatch cover generally referred to by 20~73 the numeral 1 adapted to engage in an air tight manner the coaming seal 2 of a hatchway 3 secured to the top of a railway hopper car 4. While hatch cover 1 is shown cut away in FIG. 1, it should be understood that it is circular in top plan view and seals with circular coaming seal 2 around the entire mating periphery therebetween. Hatch cover 1 is typically formed of cast metal, but may be fabricated of high density plastic and includes reinforcing rib 5 extending diametrically across the underside of hatch cover 1. The general construction and operation of the hatch cover is described in the co-assigned U.S. Patent No.
4,248,160.
When in the closed position over hatchway 3, hatch cover 1 is secured in place by a metal locking strap 6. Both hatch cover 1 and locking strap 6 are pivotally mounted to hinge assembly 7 secured to the top of hopper car 4. Locking strap 6 extends diametrically across the top of hatch cover 1 and is releasably latched to a locking mechanism 8 affixed to the top of hopper car 4 on the opposite side of hatch cover 1. It is noted that the underside of locking strap 6 bears against the top of hatch cover 1 only on a central circular bearing surface 9 in order that the periphery of hatch cover 1 will exert equalized pressure around the periphery of coaming seal 2 as is known in the art.

When hatchway 3 is to be opened, locking mechanism 8 is unlatched in a known manner and locking strap 6 is pivoted upward on hinge assembly 7 releasing the downward pressure exerted upon hatch cover 1 on bearing surface 9. Thereafter, or simultaneously, hatch cover 1 may be pivoted upward on hinge assembly 7 to thereby open hatchway 3. In the preferred embodiment, locking strap 6 runs along the longitudinal center line of the top of railroad hopper car 4.
The underside of locking strap 6 is formed to include, adjacent the hinged end thereof, a covered vent cavity 10 within which is located a vent baffle assembly 12. Baffle assembly 12 communicates with a circular vent passageway 14 formed in hatch cover 1 just beneath cavity 10 of locking strap 6. It can be seen in FIG. 2 that ambient air may communicate with cavity 10, baffle assembly 12, vent passageway 14 and the interior of hatchway 3 since locking strap 6 bears against the top of hatch cover 1 only at central bearing surface 9, thus leaving an air gap between locking strap 6 and hatch cover 1 at all other locations. It can also be appreciated that locking strap 6 acts as a significant sheild for vent passageway 14 and baffle assembly 12 in preventing rain and snow from directly impinging within cavity 10.
As best seen in FIGS. 3-12, baffle assembly 12 includes a top member 16, a bottom member 18 and a mesh screen member 20.
Top member 16 and bottom member 18 are preferably formed of D~ 432910065~

20~9673 injection molded plastic while the mesh screen member 20 is formed of woven stainless steel wire or nylon screen material.
Top member 16 includes a generally horizontal top wall 22 extending above vent passageway 14. Top wall 22 includes a generally circular center portion 26 and four finger portions 28a, 28b, 28c, 28d extending radially outwardly from center portion 26 at ninety degree intervals. One of the finger portions 28a includes a downwardly directed lip 28a' for reasons to be explained hereinafter. Extending downwardly from top center portion 26 of top member 22 are four generally vertical walls 30a, 30b, 30c, 30d spaced around within a generally circular pattern and having horizontal passageways 31a, 31b, 31c, 31d therebetween as best seen in FIG. 7. All of ver~ical walls 30a,30b, 30c, 30d are sized and positioned to snuggly pass into vent passageway 14 for holding top member 16 from horizontal movement with respect to vent passageway 14. Diametrically opposed walls 30b and 30d act also as integral clip fingers having radially outwardly directed cam lobes 30b' and 30d', respectively. When clip fingers 3Ob and 3Od are inserted down into vent passageway 14, lobes 30b' and 30d' will act to slightly bend fingers 30b and 30d radially inwardly until lobes 30b' and 30d' pass through the vertical thickness of vent passageway 14 at which time fingers 30b and 30d will spring back to their original position and top member 16 will be held in vent passageway 14 from vertical movement. However, by use of a prying instrument DN ~329tO065R

20~9673 such as a screwdriver, top member 16 may be popped up out of vent passageway 14.
Bottom member 18 includes a generally horizontal bottom wall 32 having a generally circular passageway 34 therethrough sized to overly and be coincident with vent passageway 14.
Extending upwardly from bottom wall 32 is a generally circular vertical wall 36 having a single horizontal passageway 36' therein. Also extending upwardly from bottom wall 32 is vertical wall 38 spaced radially outwardly from wall 36 and positioned to block direct linear horizontal access to passageway 36'. A short upstanding circular lip 40 is provided around passageway 34.
Nesh screen member 20 is formed as a cylinder with an inside diameter sized to fit snuggly around wall members 30a, 30b, 30c, 30d of top member 16 and circular lip 40 of bottom member 18.
When baffle assembly is in place, bottom member circular passageway 34 overlies vent passageway 14 in hopper car top 4.
Screen 20 is held from horizontal movement with respect to bottom member 18 over vent passageway 14 by lip 34. ~op member vertical walls pass within screen 20 to further secure screen 20 and project downwardly through vent passageway 14 where clip finger lobes 30b' and 30d' secure the entire baffle assembly 12 in place over vent passageway 14. Lip 28a' of finger 28a on top wall 22 of top member 16 engages with the top of passageway 36' of bottom member 18 to prevent angular displacement between top member 16 _ g and bottom member 18~ Vertical wall 30a of top member 16 blocks any direct linear horizontal passage of contaminants from passageway 36' and thus the combination of vertical walls 38, 36 and 30a provide a tortuous path through which it is difficult for contaminants such as rain to pass through. Further, screen 20 will block and hold solid contaminants such as air borne seeds and insects and prevent entrance of same into vent passageway 14.
If screen 20 should become clogged, top member 16 may be pryed out from engagement with vent passageway 14 to either replace the entire baffle assembly 12 or just screen 20.
It can thus be seen that the preferred embodiment of the present invention achieves all of the objects and advantages set forth hereinabove.
As numerous changes could be made in the above preferred embodiment of the invention without departing from the scope of this invention, it is intended that all matter contained in the above-description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. For example, top wall 22 of top member 16 could extend completely over vertical wall 36 of bottom member 18, or vertical walls 30a, 3Ob, 30c, 3Od could be integral with bottom member 18 and top member 12 would then clip onto the top of bottom member 18. The scope of the protection of this invention is to be determined solely by the language of the following claims, as interpreted according to the Doctrine of Equivalents.

Claims (20)

1. A hatch cover assembly comprising:
a hatch cover adapted to close a hatchway;
a vent passageway through said hatch cover for venting the interior of said hatchway to the exterior of said hatchway;
vent means communicating with said passageway for preventing environmental contaminants from passing through said baffle means and through said vent passageway;
a locking strap moveable between a hatch cover closing and locking position and a hatch cover opening and unlocking position; and said vent passageway being located beneath said locking strap when said locking strap is in said hatch cover closing and locking position such that said locking strap further protects said vent passageway from environmental contamination.
2. A hatch cover assembly as specified in claim 1 wherein:
said vent means includes clip means for engaging said hatch cover and for securing said baffle means to said hatch cover.
3. A hatch cover assembly as specified in claim 1 wherein:
said vent means includes baffle means having a top member and a bottom member;

said top member including a generally horizontal top wall means extending above said vent passageway and at least one top member generally vertical wall means having at least one horizontal passageway therethrough communicating ambient air with said vent passageway;
said bottom member including at least one bottom member generally vertical wall means having at least one horizontal passageway therethrough communicating ambient air with said vent passageway; and said horizontal passageways being located such that any horizontal straight line will not pass through both said top member horizontal passageway and said bottom member horizontal passageway.
4. A hatch cover assembly as specified in claim 3 wherein:
said bottom member and said top member are formed of injection molded plastic.
5. A hatch cover assembly as specified in claim 3 wherein:
a screen mesh is positioned between said horizontal passageway in said top member and said horizontal passageway in said bottom member to prevent solid contaminants from passing into said vent passageway.
6. A hatch cover assembly as specified in claim 3 wherein:

said top member includes at least two clip fingers extending downwardly from said top wall means through said vent passageway; and said clip fingers being adapted to engage with said hatch cover to hold said baffle means securely in place.
7. A hatch cover assembly as specified in claim 3 wherein:
said top member includes means for engaging with and holding said bottom member securely in place over said vent passageway.
8. A hatch cover assembly as specified in claim 3 wherein:
said bottom member includes a generally horizontal bottom wall means having a generally circular passageway therethrough, said circular passageway overlying and being generally coincident with said vent passageway;
said bottom member includes at least one generally vertical circular wall means extending upwardly from said horizontal bottom wall means, said vertical circular wall means having a horizontal passageway therethrough;
a generally circular mesh screen means generally coaxial within said bottom member vertical circular wall means; and said top member vertical wall means being located within said circular mesh screen means and passing through said bottom wall means circular passageway such that said top member helps secure said screen means and said bottom member in place.
9. A hatch cover assembly as specified in claim 8 wherein:
one of said top and bottom members includes a third vertical wall means positioned to prevent direct horizontal entry of contaminants through said horizontal passageway of said vertical circular wall means.
10. A hatch cover vent assembly comprising:
a hatch cover adapted to close a hatchway;
a vent passageway through said hatch cover for venting the interior of said hatchway to the exterior of said hatchway;
baffle means on said hatch cover communicating with said passageway for preventing environmental contaminants from passing through said baffle means and through said vent passageway;
said baffle means including a top member and a bottom member;
said top member including a generally horizontal top wall means extending above said vent passageway, and said top member including vertical wall means extending downwardly from said top wall means;
said top member vertical wall means including at least one horizontal passageway therethrough communicating ambient air with said vent passageway;
said bottom member including at least one horizontal passageway therethrough communicating ambient air with said vent passageway; and said horizontal passageways being located such that any horizontal straight line will not pass through both said top member horizontal passageway and said bottom member horizontal passageway.
11. A hatch cover vent assembly as specified in claim 10 wherein:
said bottom member and said top member are formed of injection molded plastic.
12. A hatch cover vent assembly as specified in claim 10 wherein:
a screen mesh is positioned between said horizontal passageway in said top member and said horizontal passageway in said bottom member to prevent solid contaminants from passing into said vent passageway.
13. A hatch cover vent assembly as specified in claim 10 wherein:
said top member includes at least two clip fingers extending downwardly from said top wall means through said vent passageway; and said clip fingers being adapted to engage with said hatch cover to hold said baffle means securely in place.
14. A hatch cover vent assembly as specified in claim 10 wherein:
said top member includes means for engaging with and holding said bottom member securely in place over said vent passageway.
15. A hatch cover vent assembly as specified in claim 10 wherein:
said bottom member includes a generally horizontal bottom wall means having a generally circular passageway therethrough, said circular passageway overlying and generally coincident with said vent passageway;
said bottom member includes at least one generally vertical circular wall means extending upwardly from said horizontal bottom wall means, said vertical circular wall means having a horizontal passageway therethrough;
a generally circular mesh screen means generally coaxial within said bottom member vertical circular wall means; and said top member vertical wall means being located within said circular mesh screen means and passing through said bottom wall means circular passageway.
16. A hatch cover vent assembly as specified in claim 15 wherein:
one of said top and bottom members includes a third vertical wall means positioned to prevent direct horizontal entry of contaminants through said horizontal passageway of said vertical circular wall means.
17. A hatch cover vent assembly comprising:
a hatch cover adapted to close a hatchway;
a vent passageway through said hatch cover for venting the interior of said hatchway to the exterior of said hatchway;

baffle means communicating with said passageway for preventing environmental contaminants from passing through said baffle means and through said vent passageway;
said baffle means including a generally horizontal top wall means extending above said vent passageway and a plurality of baffle walls for preventing direct horizontal linear movement of environmental contaminants from entering into said vent passageway; and said baffle means including clip means for engaging said hatch cover and for securing said baffle means to said hatch cover.
18. A hatch cover vent assembly as specified in claim 17 wherein:
said clip means includes at least two clip fingers extending downwardly through said vent passageway; and said clip fingers being adapted to engage with said hatch cover to hold said baffle means securely in place.
19. A hatch cover vent assembly as specified in claim 18 wherein:
said clip fingers being releasable from said hatch cover to permit said baffle means to be removed from and replaced on said hatch cover, in order to clean, maintain or replace said baffle means.
20. A hatch cover vent assembly as specified in claim 17 wherein:
said baffle means includes mesh screen means for preventing solid environmental contaminants from entering said vent passageway.
CA 2059673 1991-05-06 1992-01-20 Hatch vent assembly Abandoned CA2059673A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US07695902 US5158022A (en) 1991-05-06 1991-05-06 Hatch vent assembly for railroad cars with baffle and screen mesh to prevent entry of contaminants
US695,902 1991-05-06

Publications (1)

Publication Number Publication Date
CA2059673A1 true true CA2059673A1 (en) 1992-11-07

Family

ID=24794912

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2059673 Abandoned CA2059673A1 (en) 1991-05-06 1992-01-20 Hatch vent assembly

Country Status (2)

Country Link
US (1) US5158022A (en)
CA (1) CA2059673A1 (en)

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US5628254A (en) * 1995-08-18 1997-05-13 Hendee Enterprises, Inc. Moisture barrier, filter seal for hopper rail car hatches
US5644990A (en) * 1996-03-11 1997-07-08 Dev-Mark, Inc. Railroad car hatch cover
US5960980A (en) * 1997-06-03 1999-10-05 Zeftek, Inc. Vented hatch cover
US6085664A (en) * 1997-09-19 2000-07-11 Aero Transportation Products, Inc. Vented hatch cover
US6076471A (en) * 1998-09-28 2000-06-20 Burian; William F. Tank car manway cover assembly
EP0999311A1 (en) * 1998-11-03 2000-05-10 Josef Hammer Manhole cover for dust tight closure of manholes, in particular for wells
US6742550B2 (en) * 1999-12-01 2004-06-01 Rudolph Caparros Secondary containment cap apparatus for either permanent or removable attachment to a primary chlorine container turret
US6595716B1 (en) * 2000-09-15 2003-07-22 Delaware Capital Formation, Inc. Cam lever assembly for manhole center
US7239996B2 (en) * 2002-06-10 2007-07-03 Boland Arthur J Causality based event driven timing analysis engine
US20050069663A1 (en) * 2003-09-30 2005-03-31 Morgan John M. Method for storing polymer
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US7427089B2 (en) * 2005-08-01 2008-09-23 American Railcar Industries, Inc. Apparatus and method for securing a hatch cover to a hatch port
US7661371B2 (en) * 2006-03-29 2010-02-16 Eastman Chemical Company Manway sealing system
US20090158959A1 (en) * 2007-12-20 2009-06-25 Schultz Francis R Hatch Cover For A Covered Railroad Car Having Removable Closure and Screen Member
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US7770526B2 (en) * 2008-11-03 2010-08-10 Draco Spring Mfg. Co., Inc Railcar man-way cover lift-assist system
US9739390B2 (en) * 2015-11-12 2017-08-22 Bonanza Creek Energy Operating Company, LLC Valve pressure assembly and methods of operating the same

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