Patent Grant
7950075
The present invention is directed toward portable protective covers and, more particularly, toward a cover for protecting drains, holes and the like from spills and unwanted liquids.
It is often desirable to temporarily close off drains to prevent various liquids from flowing therein. Particularly, when handling hazardous liquids in the vicinity of a drain, such as a storm drain or manhole, it is desirable to temporarily seal off the drain to prevent any hazardous liquid that may be accidentally spilled on the ground from entering the drain. Some known methods of sealing off a drain to prevent the possible ingress of liquids include providing custom fitted ridged covers, utilizing manual or automatic cutoff valves, covering the drain with a flexible material (e.g., canvas) and covering the flexible material with dirt or sand, and utilizing a uniformly thick sheet of polyurethane, vinyls, and other pliable materials to cover the entire drain. However, these known methods of drain isolation have certain practical limitations to their usefulness.
Utilizing custom fitted ridged covers or cutoff valves requires extensive preparation and installation efforts. Manufacturing a custom fitted cover and/or installing cutoff valves are both time consuming endeavors. Neither a custom fitted cover nor an installed cutoff valve can be easily adapted for use in covering and isolating drains other than the one for which the cover or valve was specifically designed. Moreover, once a custom fitted cover or cutoff valve is in place in a drain or drain system, neither is readily removable and/or transportable to another location for use.
Utilizing a flexible material held in place by dirt or sand to seal off a drain also presents certain problems in that such a covering is difficult to work with and is cumbersome and time consuming to implement in emergency situations. The effective seal surrounding the drain is limited by the dirt or sand utilized to hold the flexible material in place, and is further limited in that the dirt or sand may be washed away or eroded during flooding. Such a drain covering has limited reusability and transportability, and the seal effectuated thereby has little resistance to the shear forces of onrushing liquids.
Uniformly thick sheets of polyurethane, vinyls, and other pliable materials exhibit useful reusability and transportability properties, and are generally reliable when utilized to cover small drains or holes. However, when utilized to cover larger drains, such as those on the order of 30×30 inches and above, the large polyurethane/vinyl sheets required to cover such drains become heavy and difficult to transport and implement in emergency situations.
The present invention is directed toward overcoming one or more the above-mentioned problems.
A device for providing a temporary protective cover for drains and other holes to prevent spills and other liquids from flowing therein is provided. The protective cover of the present invention includes a durable backing layer and a pliable, tacky sealing layer adjacent the backing layer. The backing layer can include a thickened portion provided adjacent to a peripheral edge of the backing layer. The pliable, tacky sealing layer can be inherently tacky or can include a tackifier thereon such that it may adhere to a surface surrounding the drain to prevent the flow of liquid therebetween.
The protective cover of the present invention is positionable over a drain or other hole such that an exposed surface of the pliable, tacky sealing layer contacts a portion of the surface surrounding the drain or other hole, whereby the protective cover device is adapted for preventing a liquid from passing through the drain or other hole. For safety purposes, at least the top surface of the protective cover may include a color that is highly visible.
An aspect of the present invention is to provide a protective cover for installation over a drain comprising a durable backing layer having a periphery, and a pliable, tacky sealing layer adjacent a portion of the durable backing layer structured and arranged to block spills from entering the drain having a periphery inside the periphery of the durable backing layer.
Another aspect of the present invention is to provide a protective cover for installation over a drain comprising a durable backing layer having an interior region and a periphery wherein at least a portion of the interior region has a thickness less than a thickness of the backing layer adjacent its periphery, and a pliable, tacky sealing layer adjacent a portion of the durable backing layer structured and arranged to block spills from entering the drain.
A further aspect of the present invention is to provide a protective cover for installation over a drain comprising a durable rubber backing layer having a periphery and a thickened portion adjacent the periphery, and a pliable, tacky urethane sealing layer structured and arranged to block spills from entering the drain adjacent a portion of the durable rubber backing layer, the pliable, tacky urethane sealing layer having a periphery inside the periphery of the durable rubber backing layer.
These and other aspects of the present invention will be more apparent from the following description.
The present invention provides a protective cover which prevents spills and/or other unwanted liquids from flowing into drains or holes. At least a portion of the liquid is prevented from flowing into a drain or hole by the protective cover. The spill or unwanted liquid may be any flowable material such as hazardous liquids, storm water, hydrocarbons, chemicals, debris, dirt, trash and the like which are desired to be kept out of drains and the like. As used herein, the term “drains or holes” means any drain, hole or other opening such as a vent, manhole or the like through which it is desired to prevent the flow of spills or unwanted liquids.
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The durable backing layer 12 can comprise any suitable material such as natural rubber, synthetic rubber, nitrile rubber or vinyl, as well as reinforced fabric impregnated with and/or coated with rubber and/or vinyl. In one embodiment, the durable backing layer 12 may include a woven fabric surrounded by and encased in a durable and/or liquid impermeable material, which may include any of the previously mentioned materials. The durable backing layer 12 can include a tough, woven synthetic fabric molecularly coated with a liquid impermeable plastic-type compound that is minimally degradable even in adverse environments. In one embodiment, the durable backing layer 12 includes a geotextile material, such as that sold under the trade name XR-5®, and can be used to prevent the ingress of a wide range of harsh liquids. Geotextile materials are durable, flexible and exhibit good dimensional stability, tensile strength and puncture resistance. It should be understood, however, that the fabric of the durable backing layer 12 may include any natural or synthetic woven fabric and may include any natural or synthetic nonwoven fabrics.
The pliable, tacky sealing layer 14 is flexible and tacky such that it conforms to irregularities or roughness in the spill surface and adheres to the surface surrounding a drain to thereby provide a seal between the layer 14 and surface which reduces or eliminates the flow of spilled liquids. The pliable, tacky sealing layer 14 can comprise materials such as urethane, polyurethane, polyvinyl chloride and/or silicon. The pliable tacky layer 14 may have a hardness, as measured by a durometer, at least 25 percent less than the hardness of the durable backing layer 12. In one embodiment, the pliable, tacky sealing layer has a durometer hardness of less than 80 F. The pliable, tacky sealing layer 14 can comprise an inherently tacky material or can have a standard tackifier applied to any exposed surface. The pliable, tacky sealing layer 14 can have a tackiness such that it adheres to a surface surrounding a drain or hole to prevent the flow of liquid from entering the drain. In one embodiment, the pliable, tacky sealing layer 14 has sufficient tackiness such that the sealing layer adheres when pressed against a vertical wall. The tackiness of the sealing layer 14 may also be measured by other test methods known to those skilled in the art, such as rolling ball, peel and probe tests. The pliable, tacky sealing layer 14 may be permanently attached to the durable backing layer 12. Alternatively, the pliable, tacky sealing layer 14 may be removably mounted or adhered on the backing layer 12 to allow replacement of the pliable, tacky sealing layer. In another embodiment, a new pliable, tacky sealing layer may be adhered over an old pliable, tacky sealing layer if desired.
While a process is described below for manufacturing polyurethane having an inherent tackiness, one skilled in the art will appreciate that other materials, such as, for example, vinyls, silicons and rubbers, may also be modified to have an inherent tackiness. In one embodiment, a mixture of various polyurethanes can be used to make the sealing layer 14. A typical polyurethane mixture comprises from about 50 to about 80 weight percent polyol, and from about 20 to about 50 weight percent isocyanate. The liquid polyurethane is mixed and cured in a manner which gives it a moderate degree of inherent tackiness to all exposed surfaces of the polyurethane material. The molding and curing process creates a substantially smooth exposed surface, which may contain minor undulations. The polyurethane material is soft, yet resilient, and thus may be easily severed by a user with a knife. Surfaces of the polyurethane material which are exposed when a portion of it is severed can also be inherently tacky.
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In one embodiment, the material at the periphery 22 of the backing layer 12 can have a weight per unit area that is greater than the weight per unit area of the remainder of the backing layer 12. By providing a thicker layer at the periphery 22 of the backing layer 12, a more effective seal may be formed around the drain or other hole.
In one embodiment, the exposed under surface of the sealing layer band can have a surface area of from about 1 square foot to about 25 square feet. Although the sealing layer band is shown in the figures as corresponding generally to the shape of the protective cover 10, in another embodiment the sealing layer band may define an alternative shape, such as a circular shape, which does not correspond to the shape of the protective cover 10. In this embodiment, since the pliable, tacky sealing layer 14 is provided only in the sealing layer band, the protective cover 10 may be lightweight and readily implemented for use in emergency situations, such as where hazardous liquids are accidentally spilled near a drain opening. Further, both the durable layer 12 and the pliable, tacky sealing layer 14 will resist water, oil and many chemicals making the protective cover 10 suitable for use in many types of work environments, including hazardous work environments. The protective cover 10 is readily reusable and cleans up easily with soap and water.
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The protective cover can form an effective seal around a drain, is generally lightweight, and is capable of quick and easy implementation even for large drains. The protective cover is readily reusable and transportable, and may be quickly implemented to seal a drain and/or hole in an emergency situation. The protective cover may be implemented for use with a variety of different types and sizes of drains and/or holes, and forms a tight seal around the drain/hole to block out unwanted liquids from entering the drain or hole.
Whereas particular embodiments of this invention have been described above for purposes of illustration, it will be evident to those skilled in the art that numerous variations of the details of the present invention may be made without departing from the invention as defined in the appended claims.
This application is a continuation-in-part of U.S. application Ser. No. 11/189,660 filed Jul. 26, 2005, which is a continuation-in-part of U.S. application Ser. No. 10/447,364 filed May 28, 2003, now abandoned, each of which are incorporated herein by reference.
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| Number | Date | Country | |
|---|---|---|---|
| 20070033722 A1 | Feb 2007 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11189660 | Jul 2005 | US |
| Child | 11584849 | US | |
| Parent | 10447364 | May 2003 | US |
| Child | 11189660 | US |
