The present invention relates to a safety net having an attachment device for securing to a construction element particularly for use as a fall arrest apparatus.
When working at elevated positions, in order to protect anyone below the working position, a safety apparatus should be provided to arrest a fall of debris. Typically a safety net may be suspended just below the working height fastened, for example, to free standing columns or to fixtures mounted to a wall.
However for permanent fall arrest protection, for instance in engineering facilities having overhead fittings, maintaining a suspended safety net to span the entire overhead area may not be appropriate due to the construction of the facility, the working height, the obstruction it would cause or its cost. There is therefore a need for an improved safety apparatus which addresses these drawbacks, is relatively inexpensive to manufacture and easy to install. It is an object of the present invention to address this need or, more generally, to provide an improved safety net.
In some embodiments a fall arrest safety net assembly includes a bag constructed from one or more wire strands which are turned back upon themselves to form loop members and a plurality of eyes. An elongate line extends through the eyes spaced about the mouth of the bag. The bag includes a slit that separates a first loop member from an adjacent second loop member. The second loop member includes a toggle that is sized to selectively prevent the toggle from exiting an accepting space opening.
While multiple embodiments are disclosed, still other embodiments of the present invention will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments of the invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not restrictive.
According to one aspect of the present invention there is provided a safety net assembly comprising: a bag constructed of a wire mesh strand, the bag having an open mouth, the bag including a plurality of eyes integral with the wire mesh and spaced circumferentially about the mouth; an elongate line having a first end and a second end, a first line portion and a second line portion of the line being disposed adjacent the first end and the second end respectively, an portion of the line located between the first line portion and the second line portion, and a choker fitting having a spaced apart upper surface and lower surface through which a plurality of apertures or openings extend, and an end fixture on the choker fitting, wherein the first portion of the line is removably connected to the choker fitting, the first end of the line being removably connected to the end fixture of the choker fitting, the intermediate portion of the line extending through the eyes for drawing the mouth closed, and the second portion of the line extending through at least one of the apertures or openings in the choker fitting.
The first portion of the line provides an elongate flexible member, and while the first portion of the line may be continuous, it may alternatively be interrupted by fasteners, links, or the like, connected to adjacent ends of the line and which can be separated so that the ring may be broken as needed in some installations of the net (which are discussed below).
Preferably the intermediate portion extends through the plurality of apertures or openings in the choker fitting so that a loop in the line protrudes from each of the upper surface and lower surface of the choker fitting. It will be apparent that two apertures or openings will be sufficient for connection in this manner, however most preferably the plurality of apertures or openings include three apertures or openings through which the line passes sequentially.
Preferably the line further comprises a terminal eye formed on each of the first end and the second end of the line. The assembly preferably further comprises a spring loaded hook type fastener received in the terminal eye at each of the first end and the second end of the line, the hook type fastener on the first end of the line providing the removable connection to the end fixture of the choker fitting. The spring loaded hook type fastener on the second end of the line may be utilized for connection to any desired structure.
Preferably the upper surface and the lower surface of the choker fitting are bounded by a first pair of spaced apart side surfaces and a second pair of spaced apart side surfaces which define a region therebetween and the plurality of apertures or openings are within the region of the choker fitting. The choker fitting may be any desired geometric shape as desired for particular applications such as square, rectangular or the like. The end fixture on the choker comprises a end fitting aperture spaced extending through the choker fitting from the upper surface to the lower surface and the end fitting is spaced from the plurality of apertures The hook type fastener on the first end of the line is removably connectable to the first end fitting aperture. Thus, by pulling on one or both of the loops, the circumference of the mouth is decreased to allow a desired fitting configuration.
Preferably the wire mesh bag is formed from a length of wire strand with fastenings joining portions of the length of wire strand, the length of wire extending from the closed end toward the mouth and being turned back upon itself to form the eyes at the mouth and corresponding eyes at the closed end, each eye at the mouth being fixed by a respective one of said fastenings to the adjacent eye on either side thereof, and each eye at the closed end being fixed by a respective one of said fastenings to the adjacent eye on either side thereof to form the bag.
The fastenings that join two portions of the length of wire and are preferably all of like type, most preferably being ferrules which are crimped or molded in place.
Preferably the fastenings joining the eyes at the closed end are more closely spaced along the length of wire than the fastenings joining the eyes at the mouth.
In another aspect the invention provides a method of securing apparatus mounted overhead upon a construction member, the method comprising: [0014] providing a safety net assembly substantially as described above; introducing the apparatus through the mouth so as to at least partially enclose the apparatus in the wire mesh bag; manipulating the choker fitting and line to close the mouth; looping the second portion about the construction member, and connecting the first portion and the second end by means of a hook fastener.
The thickness or gauge of the wire mesh strand may be on the order of 0.5 to 1.0 millimeters and the thickness or gauge of the line may be on the order of 1.5 to 2.00 millimeters.
The present invention also may also include one or more wire mesh extent adjustments. Each of the wire mesh adjustments comprise a short length of auxiliary wire having a first end and a second end and the first end and the second end are secured to the wire mesh strand at, for example, a first section thereof thereby leaving a wire mesh strand accepting space between the auxiliary wire and the wire mesh strand. A second section of the wire mesh strand is passed through the wire mesh strand accepting space and a toggle is coupled to the second section of the wire mesh strand. The toggle is sized so as to prevent the second section from exiting the wire mesh strand accepting space. Thus, the extent of the wire mesh may be reduced by pulling on the second section of the wire mesh strand so that more of the second section extends through the wire mesh strand accepting space thereby reducing the extent of the wire mesh. The auxiliary wire may be the same thickness or gauge as the wire mesh strand and the length thereof may be on the order of five to ten centimeter though heavier or lighter gauges and longer or shorter lengths of the auxiliary wire may be utilized as desired for particular applications.
The present invention may also include a pair of spaced apart locator tabs. Each of the locator tabs comprises a disc coupled to the wire mesh strand preferably at opposite locations thereon. The locator discs provide a visual indication of the extent of the wire mash bag thereby allowing for proper installation of the wire mesh bag.
Thus, this invention provides a safety net assembly which is effective and efficient in operational use, and which has an overall simple design which minimizes manufacturing costs and maximizes performance.
Preferred forms of the present invention will now be described by way of example with reference to the accompanying drawings, wherein similar reference characters refer to similar elements and in which:
Referring to
In the first embodiment illustrated the mesh is made from a length of wire strand 5 which may be continuous (i.e. a single length) or discontinuous (for instance, including end-to-end joints) and which provides a degree of flexibility and resilience to the bag 1, allowing it to be expanded in the transverse direction to accommodate apparatus of varying size, while being readily collapsible. The bag 1 is made from a planar mesh 10, shown in
The wire mesh 10 is a non-woven strand type in which portions of the length of wire 5 are joined by fastenings in the form of ferrules 9a. 9b, 9c, 9d at nodes of the mesh. The length of wire 5 extends generally longitudinally and is turned back upon itself and joined by ferrules 9c to form eyes 11 at the first edge 23 of the mesh 10, and by ferrules 9d to form eyes 12 at the longitudinally opposing second edge 22 of the mesh 10. Fastenings in the form of ferrules 9b join the adjacent eyes 12 along the second edge 22 and ferrules 9a join the adjacent eyes 11 along the along the first edge 23.
The mesh 10 may be conveniently manufactured by winding the length of wire 5 between pegs 27 spaced apart in two parallel lines, the lines being spaced apart in the longitudinal direction (relative to the mesh 10). The length of wire 5 is wound about the pegs in a zigzag pattern, alternating in direction when it is turned back upon itself around each peg 27. To then form the bag 1 from the mesh 10 of
To produce a bag 1 shaped to taper outwardly from the closed end 2 toward the open mouth 3, the transverse dimension of the second edge 22 exceeds that of the first edge 23. To achieve this, the eyes 12 are larger than the eyes 11 and the ferrules 9a joining the eyes 11 are spaced more closely apart (by dimension 24 measured along the length of wire 5) than the ferrules 9b joining the eyes 12 on the second edge 22 (which are spaced by dimension 25 measured along the length of wire 5).
The choker fitting 52 shown in detail in
If desired, on the front face 53 are textual indicia 80 including an “Expiry date” marking 81 located adjacent a blank area 82 where a date can be permanently marked, by engraving, etching, stamping of the like, to notify users of the end of the working life of the product.
The line 33 has a first end 70 which is removably connected to the choker fitting 52 by a end hook fastener 70′ mounted on a terminal eye 73 and the hook fastener 70′ is coupled to the line receiving aperture 65. A second end 72 of the line 33 opposite the first end 70 includes a terminal eye 73′ similar to the terminal eye 73 and a second end hook fastener 70″ connected to the terminal eye 73′. The first end hook fastener 70′ and the second end hook fastener 70″ may D ring type fasteners as shown on
A first portion 74 of the line 33 adjacent the first end 70 extends from the end fixture 55 in a ring through the eyes 12 for drawing the mouth 3 closed. A second portion 78 of the line 33 extends from the choker fitting 52 to the second end 72. An intermediate portion 75 of the line 33 is located between the first line portion 74 and second line portion 78, and passes sequentially through the openings 56, 57, 58 in the choker fitting. As shown in dashed outline in
The line 33 and the length of the wire strand of the mesh bag 1 are preferably twisted stainless steel wire cables for corrosion resistance. The wire mesh may be formed of wire strand having a gage or thickness in the range of 0.5 millimeters to 1.0 millimeters and wire 33 may be formed of a wire having a gage or thickness of 1.5 millimeters to 2.0 millimeters though larger or smaller gauges may be selected for the wire mesh strand and the wire 33 as desired for particular applications. The other components, such as the ferrules 9a, 9b, 9c, 9d and the hook fasteners 70′ and 70″ are also formed of stainless steel.
A third embodiment of the invention is shown in
In
In a fourth embodiment the net of the invention, shown in
In use, as best seen in
In some applications of the present invention it may be desirable to provide indicator tabs on the wire mesh. One or more such indicator tabs may be incorporated in each of the present invention described herein or any other variation of the structure of the present invention as desired for particular applications. Two such locator tabs 130 are shown on
The present invention may also include structure for increasing or decreasing the size of the bag 1 in order to accommodate various sized apparatus such as the light fitting 50 (
16 illustrate the toggle 170 of the structure 160. The toggle 170 is a generally solid cylinder having an axis 175 and an axial length B with rounded ends 170′ and 170″. A wire strand accepting aperture 172 is provided to extend through the toggle 170 and the second strand 168 is positioned in the aperture 172 and is fixed, for example by crimping to provide a permanent attachment therebetween. As noted above, the axial length B is selected so that the toggle 170 cannot fit through the opening L.
The mesh bag of the present invention is adaptable to accommodate a wide variety of fixtures other than the generally rectangular prism shape of the electrical fitting 50 shown in
While particular embodiments and applications of the present invention have been above described and illustrated, the present invention is not limited to the precise construction and arrangements disclosed. Those persons knowledgeable in the art may conceive of certain modifications, changes and variations in the detailed embodiments disclosed above as illustrative, to suit particular circumstances or products to be formed. The invention is therefore not intended to be limited to the preferred embodiments depicted, but only by the scope of the appended claims and the reasonably equivalent apparatus and methods to those defined therein.
This Application is a continuation of U.S. application Ser. No. 13/987,804, filed Sep. 4, 2013, which is a continuation-in-part of U.S. application Ser. No. 12/460,245 filed Jul. 16, 2009, now U.S. Pat. No. 8,714,308, issued May 6, 2014, which are herein incorporated by reference in their entirety.
Number | Date | Country | |
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Parent | 13987804 | Sep 2013 | US |
Child | 15259800 | US |
Number | Date | Country | |
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Parent | 12460245 | Jul 2009 | US |
Child | 13987804 | US |