Generally, in mining, miners must install and remove hangers from the ceiling of the mines. These hangers support various types of cables and wires, electrical or otherwise, etc. Often these hangers and cables are installed and removed by hand. Historically, to remove the cables, miners walked beneath the hangers and removed the cable from each hanger, or removed the cable and the hanger from the ceiling of the mine. All of this is and has been done by hand.
A Mobile Roof Support (MRS) is a machine used to perform full pillar extraction methods in underground coal mines. The use of MRS's eliminate the setting of roadway, turn, and breaker posts that are required during pillar recovery operations. These machines provide more effective ground control than timbers, and their usage enhances the safety of persons in the mines and reduces material handling injuries. MRS's are shield type hydraulic support units mounted on crawler tracks and remotely controlled.
Many MRS's are equipped to retract cable and to wind up the cable. Often, though, even when miners are working with MRS's, the miners need to release the cable from the hangers by hand before the MRS can wind the cable. A need exists for miners working MRS's to be able to remove the cable from the roof supports or hangers while avoiding danger to miners working in the area of the so-called Red Zone Pillar Line (the “Red Zone”) in a mine.
The Red Zone is where the pillars of coal are being extracted. Miners are encumbered and endangered in their work by having to enter the Red Zone in order to retrieve the cable from the hangers. They are endangered by the possibility of the roof falling on top of them. A collapsible hanger, such as that shown by the present invention, would release the cable safely from the roof without miners having to enter the Red Zone to get the cable out of the hangers by hand. A collapsible roof hanger satisfies this need by allowing the cable to fall to the ground when tension and/or weight is put on the hanger, such as when the cable is retracted. Depending upon the embodiment of the hanger, it may or may not stay in the roof plate after the cable is released. In a preferred embodiment of the present invention, the hanger stays in the roof plate after releasing the cable. Additionally, the present invention collapsible hanger may be made in a variety of ways, which allow it to be produced and to sell at a low or reasonable cost. The low cost permits miners to leave the hangers in the mine instead of having to recover them to use for new mining projects and areas.
One embodiment of the present invention comprises a collapsible hanger for use in mining having an upper hook, at least one lower hook, and a connecting member, which connects the upper hook to the at least one lower hook, wherein the at least one lower hook is constructed such that when tension is applied to a cable supported by the at least one lower hook, the hanger releases the cable.
Another embodiment of the present invention comprises a method of working with cables in a mine including installing a collapsible hanger in the mine roof. The collapsible hanger is comprised of an upper hook, at least one lower hook, and a connecting member, which connects the upper hook to the at least one lower hook, wherein the at least one lower hook is constructed such that when tension is applied to a cable supported by the at least one lower hook, the hanger releases the cable. This embodiment of the present invention also includes releasing the cable from the hanger by applying tension to the cable.
Other embodiments of the present invention may include the steps of winding up the released cable and/or leaving the hangers in the ceiling of the mine after the cable is released.
For the present invention to be easily understood and readily practiced, the invention will now be described, for the purposes of illustration and not limitation, in conjunction with the following figures, wherein:
In one embodiment of the present invention provides for a collapsible hanger (1) that uses the ability of gauged wire to permanently bend under pressure to release a cable from the hanger (1) without miners having to place themselves near the hanger and/or in harm's way.
The words “roof” and “ceiling” are used interchangeably herein. Essentially, the upper hook (10) of a collapsible hanger (1) hangs on or in the roof plate or ceiling of a mine. The hanger (1) can hook directly into the roof or ceiling of the mine or it can hang from another apparatus, which is secured to the mine roof or ceiling. Often times, as shown in
Similarly, the word “cable” is used herein to refer to cables, wires, chains, rope, or any cargo that may be supported by the hanger (1). A “cable” is one type of cargo that is often support by such hangers (1), but it is not meant to be the sole and exclusive type of cargo used with the hangers (1) of the present invention. It will be obvious to one skilled in the art that any type of cargo that can be supported by the hangers (1) may benefit from the present invention. As such, the word “cable” should not be read to limit this invention.
In one embodiment of the present invention, shown in
The connecting member (20) connects the upper hook (10) to at least one lower hook (30). The connecting member (20) can be any size, shape, or material that is sufficiently strong to securely connect the lower hook(s) (30) to the upper hook (10) and to support the lower hook's (30) cargo. In a preferred embodiment of the present invention, the connecting member (20) is of a similar gauge wire diameter, which changes size as it is cut to form the lower hook(s) (30) into a smaller gauge of wire. In a preferred embodiment of the present invention, the diameter of the metal wire connecting member (20) is 0.125 inches. Additionally, in a preferred embodiment of the present invention, the connecting member (20) remains securely connected to the lower hooks (30) and the upper hook (10) when tension is applied to the cable (50).
At least one lower hook (30) connects to the connecting member (20).
Of significance to some embodiments of the present invention, each lower hook(s) (30) is designed to collapse under tension or pressure (see
In another embodiment of the present invention, the upper hook (10) is designed to remain in the roof while the lower hooks (30) are designed to bend and plastically deform under pressure and/or tension and to let the cable (50), or whatever cargo the lower hooks (30) are supporting, fall to the ground. It is possible to have other embodiments of the present invention, such as where the upper hook (10) bends and/or releases from the mine ceiling, thus, allowing the hanger (1) and the cable/cargo (50) to fall to the ground, where the act of bending can cause upper hook (30), connecting member (20), or lower hook (10) to break. In an alternative embodiment of the present invention, shown in
The collapsible hangers (1) of the present invention solve many of the problems faced by miners by releasing the cable (50) without the miners having to enter the Red Zone. Otherwise, the miners would have to enter the Red Zone to take the cable (50) down from the hangers and, thus, risk possible injury. In addition, a collapsible hanger (1) according to the present invention saves time by allowing for the continued extraction of coal without stopping production to manual remove the cable from the hangers and/or to remove the hangers from the released cable prior to winding the cable.
In another embodiment of the present invention, the collapsible hanger (1) “breaks” or collapses/releases at each lower hook(s) (30), not higher than at the point where the lower hook(s) (30) meets the connecting member (20) and not at the upper hook (10). Additionally, in yet another embodiment of the present invention, the collapsible hanger (1) remains in the ceiling after the cable is released. This embodiment allows the MRS to wind the cable up without the additional step of having someone remove and/or untangle the fallen hangers (1) from the fallen cables prior to the winding up process. These characteristics explain a preferred embodiment of the present invention, but should not be read to limit all embodiments of the present invention.
In certain embodiments of the present invention, the collapsible hanger (1) is comprised of two or more thicknesses of gauged wire. These gauges can be combined in any way, but experiments thus far indicate that the best results are obtained when a heavier gauge is used for the upper book (10) and a lighter or lower gauge is used for the connecting member (20) and the lower hook(s) (30). In a preferred embodiment of the present invention, the gauges are chosen so that the lower hook(s) (30) collapse under a weight in the range of 50 to 100 pounds. In a preferred embodiment of the present invention, the upper hook (10) is comprised of 0.250 inch gauged wire and designed to stay in the roof plate (40) when the cable is released, the connecting member (20) is comprised of 0.125 to 0.312 inch diameter gauged wire, and the lower hook(s) (30) are comprised of 0.125 to 0.312 inch diameter gauged wire. The thickness of the lower hook(s) (30) varies according to the machine torque and diameter of the cables being used.
The examples of the disclosed embodiments of the present invention have been found to provide very favorable results. The upper hook (10) fits into a roof plate (40) and the cable is supported on both sides of the hanger (1) in the lower hook(s) (30). The tension from the retraction of the cable, along with the weight of the cable, causes the lower hook(s) (30) to release the cable, by plastically bending or breaking, thus lowering the miners' risk of being hit with cable, keeping the miners out of the Red Zone, eliminating the need to remove fallen hangers from the fallen cable, and allowing for the MRS to be moved and to continue further roof support.
Another embodiment of the present invention is characterized by a single lower hook (30) made to collapse under a weight in the range of 50 to 100 pounds (as shown in
In the disclosed embodiments of the present invention, the hangers (1) will be flame resistant and/or flame retardant, nonconductive, and have anti-static properties. Additionally, in preferred embodiments of the present invention, the hangers (1) will be a bright color, preferably yellow, orange, pink, green, red, or a combination thereof. Finally, in the preferred embodiment of the present invention, the hangers (1) are coated with the material Polyarmor G17® or coated with another polyethylene copolymer-based thermoplastic powder coating.
The hangers (1) of the present invention can be made of almost any material(s), so long as the construction of the hangers (1) allows them to satisfy the above-identified criteria. For example, metal, chain, wire, cable, plastic, or rope. The entire hanger (1) may be comprised of galvanized or non-galvanized metal, wire, or metal wire.
As shown in
Similarly, the component parts of the present invention may have varying dimensions. In one embodiment of the present invention, the upper hook (10) is an “S” hook measuring 2.125 inches in length. In another embodiment of the present invention, the upper hook (10) is made of 0.250-inch diameter galvanized wire. In a further embodiment of the present invention, each lower hook(s) (30) is made of 0.125-inch diameter galvanized wire. Another embodiment of the present invention comprises a collapsible hanger (1), wherein the combined length of the connecting member (20) and the one lower hook(s) (30), from the uppermost end of the connecting member (20) to the lowermost end of the lower hook(s) (30) is 3.125 inches. In yet another embodiment of the present invention, the collapsible hanger (1) has one or more lower hooks (30) comprised of wire having a gauge in the range of 0.091 to 0.187 inches.
Finally,
The present invention also encompasses a method of working with cables in a mine comprised of installing a collapsible hanger according to any of the above-identified embodiments. In one embodiment of the present invention, such a method of working with cables in a mine comprises installing a collapsible hanger comprised of: (i) an upper hook; (ii) at least one lower hook; and (iii) a connecting member, which connects the upper hook to the lower hook(s), wherein the lower hook(s) is constructed such that when tension is applied to a cable supported by the lower hook(s), the hanger releases the cable. In a further embodiment of the present invention, this method also comprises releasing the cable from the hanger, which may be done by applying tension to the cable. Additionally, in one embodiment of the present invention, the cable is wound up after it is released from the hangers. Finally, in another embodiment of the present invention, the hangers may be left in the ceiling of the mine after the cable is released. These methods may utilize any and all of the embodiments of the collapsible hanger described herein.
In operation, one method of suspending and releasing a cable from a ceiling comprising the steps of:
Providing a hanger having an upper hook, at least one lower hook; and a connecting member that connects the upper hook to the at least one lower hook;
Installing the upper hook of the hanger into the ceiling;
Placing the cable within the at least one lower hook to suspend the cable from the ceiling; and
Breaking the hanger to release the suspended cable from the hanger.
A further operational step can include the step of installing the upper hook into the ceiling comprising the steps of (i) attaching a ceiling plate to the ceiling and (ii) attaching the upper hook to the ceiling plate.
Another further operational step can include the step of installing the upper hook into the ceiling further comprising the step of (iii) connecting the connecting member to the upper hook.
Another further operational step can include the step of installing the hanger into the ceiling further comprising the step of (iv) connecting the at least one lower hook to the connecting member.
Another further operational step can include the step of breaking the hanger further comprising the step of breaking the at least one lower hook.
Another further operational step can include the step of breaking the hanger further comprising the step of breaking the connecting member.
Another further operational step can include the step of breaking the hanger further comprising the step of breaking the upper hook.
Another further operational step can include the step of leaving a portion of the upper hook in the ceiling after the cable is released.
Another further operational step can include the step of leaving the upper hook connected remains in a roof plate when tension is applied to the cable.
Another further operational step can include the step of breaking the hanger further comprising the step of applying tension to the suspended cable to break the hanger.
Now returning to
an upper hook 10 that securely hangs from a ceiling of the mine;
at least one lower hook 30 that carries and supports the cable 50; and
a connecting member 20 operably connected to or disposed between the upper hook 10 and the at least one lower hook 30 to form interconnecting members of the hanger,
Any one or more of the interconnecting members 10, 20, 30 of the hanger 1 can break to release the cable 50 and facilitate safe removal of the cable 50 from the mine when tension or pressure is applied to the lower hook 30 by the cable 50. Therefore, the broken interconnecting member can be at least one lower hook 30, or the broken interconnecting member can be the connecting member 20, or the broken interconnecting member can be the upper hook 10.
Also illustrated in the above-mentioned figures is upper hook 10 having a distal end 10A being attachable to connecting member 20, and a proximal end 10B being attachable to the ceiling 40 (
Now returning to
Also illustrated in
As mentioned above,
As discussed above,
While the disclosure has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the embodiments. Thus, it is intended that the present disclosure cover the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.
This patent application is a Continuation of U.S. non-provisional application Ser. No. 11/026,593, titled COLLAPSIBLE HANGER, filed on Dec. 30, 2004, which claims benefit of U.S. provisional application Ser. No. 60/623,305, titled COLLAPSIBLE HANGER, filed on Oct. 29, 2004, both are incorporated herein by reference.
Number | Date | Country | |
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60623305 | Oct 2004 | US |
Number | Date | Country | |
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Parent | 11026593 | Dec 2004 | US |
Child | 12803859 | US |