CLAIM OF PRIORITY
The present application claims the benefit of the United States provisional patent application filed on Aug. 10, 2008 by Robert W. Honeycutt for COMPONENTS OF SAFETY EQUIPMENT AND METHODS FOR MANUFACTURING THE SAME (Ser. No. 61/087,732), the entire disclosure of which is incorporated by reference as if set forth verbatim herein.
FIELD OF THE INVENTION
The present invention relates generally to fall restraint equipment components. More particularly, the present invention relates to posts for gangways.
BACKGROUND OF THE INVENTION
FIG. 1 illustrates an example of fall restraint equipment comprising a stairwell 16, a platform 18, and a gangway 10. Stairwell 16 ascends to platform 18, where gangway 10 is connected. An optional cage 20 may be connected to gangway 10 if desired. In this example, the fall restraint equipment provides a user with access to a top 14 of a container 12 (such as a railway car).
FIG. 2 illustrates a gangway 200 that may be used as gangway 10 of FIG. 1. Gangway 200 comprises a base tread 202, which includes two posts or “uprights” 204 connected to base tread support 206. Uprights 204 are preferably welded to base tread support 206 but may be connected to the support by other suitable means, such as by bolting. Base tread 202 is conventionally connected to a fixed structure, such as platform 18 (FIG. 1). An support structure or “underbody” 208 is pivotally connected to base tread support 206 at one end and is pivotally connected to another tread 210, such as a seatainer tread, at the other end. Seatainer tread 210 is comprised of uprights 212 and 214 connected to each side of a tread support 216. Each set of uprights 212 and 214 are interconnected by lateral posts 218 and 220. Lateral posts 218 and 220 may be referred to as “joiners,” “connectors,” or “spacer tubes.” In this example, gangway 200 additionally comprises a pair of self-leveling supports 222 pivotally connected to underbody 208. Uprights 212 include top portions 226 that are configured to pivotally receive respective portions of a pair of handrails 224. Likewise, uprights 204 are configured to pivotally receive opposite ends of handrails 224. Gangway 200 may comprise additional components, such as a pair of supports, handrails, or “blocking rails” 228, as desired or needed.
The pivotal connections between underbody 208 and base tread 202, self-leveling supports 222, and seatainer tread 210 enable gangway 200 to rotate with respect to a fixed structure, such as platform 18 (FIG. 1). Additionally, the pivotal connections between uprights 204 and top portions 226 of uprights 212 allow seatainer tread 210 to rotate with respect to base tread 202.
Components of fall restraint equipment, such as gangways, are generally formed by welding smaller pieces of stock material together. For instance, top portions 226 of uprights 212 are formed by welding various pieces of stock material together, which are drilled or cut prior to welding. Portions 226 are then welded to a tubular piece of metal. Other areas of uprights 212 are then formed in a similar manner. For example, the portions that connect the uprights to tread support 216 are likewise formed from smaller pieces of metal that have been cut and welded together. These portions are then welded to the bases of the tubular metal of uprights 212 in order to form the complete upright. Once uprights 212 and 214 have been created in this manner, respective ends of lateral posts 218 and 220 are welded to the uprights. Manufacturing components for fall restraint equipment in such a manner is a protracted process and increases the cost of the finished product.
BRIEF DESCRIPTION OF THE DRAWINGS
A full and enabling disclosure of the present invention, including the best mode thereof directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended drawings, in which:
FIG. 1 is a perspective view of an exemplary fall restraint system;
FIG. 2 is a perspective view of a gangway that may have been used in the system of FIG. 1;
FIG. 3 is a perspective view of a seatainer tread of a gangway in accordance with an embodiment of the present invention;
FIG. 4 is a perspective view of an upright to be used in conjunction with the seatainer tread of FIG. 3;
FIG. 5 is a perspective view of a continuous piece of tubular metal to be formed into the upright of FIG. 4;
FIGS. 6, 7, and 8 are left side, front, and back elevation views, respectively, of the post of FIG. 4;
FIG. 9 is a perspective view of another upright of the seatainer tread of FIG. 3;
FIG. 10 illustrates the formation of a sidepost assembly of the seatainer tread of FIG. 3;
FIG. 11 is a perspective view of another gangway that may have been used in the system of FIG. 1;
FIG. 12 is a perspective view of an upright of a ramp of a gangway in accordance with an embodiment of the present invention;
FIG. 13 illustrates the formation of a top portion of the upright of FIG. 12;
FIG. 14 is a perspective view of a bottom portion of the upright of FIG. 12; and
FIG. 15 illustrates an exemplary process for forming an upright in accordance with an embodiment of the present invention.
Repeat use of reference characters in the present specification and drawings is intended to represent same or analogous features or elements of the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Reference will now be made in detail to presently preferred embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment may be used on another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.
FIG. 3 illustrates a seatainer tread 300, which may be substituted for the seatainer tread 210 of gangway 200 (FIG. 2). Additional information regarding the construction and operation of gangways is contained in U.S. patent application Ser. No. 12/329,883, the entire disclosure of which is hereby incorporated by reference as if set forth verbatim herein. Seatainer tread 300 comprises two sidepost assemblies or handrails 302 connected to respective sides of support tread 304. Each handrail 302 comprises a first post or upright 306 and a second post or upright 308 interconnected by lateral posts 310 and 312.
The arrangement, construction, and formation of uprights 306 is described with reference to upright 306a although those of ordinary skill in the art should understand that upright 306b is a mirror image of upright 306a and is thus formed and used in substantially the same manner. Referring to FIGS. 4 and 5, upright 306a is formed from a continuous piece 500 of tubular metal. Continuous piece 500 of tubular metal is butterflied, notched, lasered, or otherwise cut at locations 502 and 504 at the distal ends of piece 500 as illustrated in FIG. 5. Area 502 is configured to receive and connect to an end of a handrail, such as handrail 224 (FIG. 2). Area 504 is configured to connect to both support tread 304 (FIG. 3) and a support structure of a gangway, such as underbody 208 (FIG. 2). Additionally, continuous piece 500 of tubular metal is cut to define an aperture 506 configured to receive a connecting device, such as a bolt or rivet, in order to connect the upright to the support tread and the support structure. In another embodiment, the connecting device is a cross tube that extends through aperture 506 of upright 306a through the interior of tread support 304 and through aperture 506 of upright 506b on the other side. The cross tube is then welded at the connection of the cross tube, upright 306, and tread support 304. The shape of area 504 and the connecting device allow seatainer tread 300 (FIG. 3) to rotate with respect to the support structure without interfering (or coming into contact) with the support structure. Continuous piece 500 of tubular metal is also notched or otherwise cut to define two sets of apertures 508 and 510, such that the sets of apertures are configured to receive portions of respective lateral posts 310 and 312 (FIG. 3) as described in more detail below. FIGS. 6, 7, and 8 illustrate upright 306a formed from continuous piece 500 of tubular metal.
Referring again to FIG. 3, those of ordinary skill in the art will appreciate that upright 306b is a mirror image of upright 306a. Upright 306b may be connected to and used on the opposite side of seatainer tread 300 with respect to upright 306a. In contrast, uprights 308a and lateral posts 310a and 312a are identical to upright 308b and lateral posts 310b and 312b, respectively, so that each may be used on either side of seatainer tread 300.
FIG. 9 illustrates upright 308 formed from another continuous piece 900 of tubular metal. Continuous piece 900 of tubular metal is notched or otherwise cut so that upright 308 defines two sets of apertures 902 and 904 configured to receive portions of respective lateral posts 310 and 312 (FIG. 3) as described below.
FIG. 10 illustrates the formation of handrail 302a comprising uprights 306a and 308a and lateral posts 310a and 312a. The ends of lateral post 310a define inserts or “tabs” 1002 and 1004 that extend laterally from the post. Similarly, the ends of lateral post 312a define inserts 1006 and 1008. Tabs 1002 of lateral post 310a are inserted into apertures 508 of upright 306a, and tabs 1004 of the post are inserted into apertures 902 of post 308a. Similarly, tabs 1006 of lateral post 312a are inserted into apertures 510 of upright 306a, and tabs 1008 are inserted into apertures 904 of upright 308a. Once connected, uprights 306a and 308a and lateral posts 310a and 312a may be welded and galvanized as desired. It should be understood by those of ordinary skill in the art that handrail 302b is formed in a similar manner. Handrails 302 are then connected to support tread 304 as described above.
Referring additionally to FIG. 3, it should be understood that the ends of lateral posts 310 (and/or lateral posts 312), including tabs 1002 and 1004, as well as apertures 508 and 902, may be formed so that lateral posts 310 (and/or lateral posts 312) exhibit an angled arrangement and so that upright 306 is lower than upright 308 with respect to a horizontal plane. This provides easier access to and use of handrails 302 when the corresponding gangway is oriented in a lowered position, as illustrated by gangway 200 in FIG. 2.
FIG. 11 in a perspective view of a gangway 1100 that may be used as gangway 10 of FIG. 1. Among other elements, gangway 1100 comprises a ramp portion 1102, posts or “uprights” 1104, base tread 202, and support structure 208. Base tread 202 is pivotally connected to support structure 208 in a manner similar to that described above with respect to FIG. 2. Ramp portion 1102 is also connected to support structure 208. Uprights 1104 comprise tubular portions 1106 connected between bottom portions 1108, which are pivotally connected to ramp portion 1102, and top portions 1110, which are configured to receive portions of handrails 224. The pivotal connections between base tread 202 and support structure 208 and between the support structure and uprights 1104 allow ramp portion 1102 to rotate with respect to a fixed structure.
Top portions 1110 are formed by welding various pieces of metal and stock material together, which are drilled or otherwise cut prior to welding. Portions 1110 are then welded to lower portions 1108 in order to form upright 1104. As set forth above, manufacturing components for fall restraint equipment in such a manner is a protracted and costly process.
FIG. 12 is a perspective view of an upright 1200, which may be substituted for uprights 1104 of gangway 1100 (FIG. 11). Upright 1200 comprises a post, tube, or “shaft” portion 1202 connected to a base portion 1204. FIG. 13 illustrates the formation of shaft portion 1202 from a continuous piece 1300 of tubular metal. Continuous piece 1300 of tubular metal is butterflied, notched, lasered, or otherwise cut at a distal end 1302 to form the area configured to receive a portion of a handrail, such as handrail 224 of FIG. 11. Referring to FIG. 14, base portion 1204 defines an aperture 1400. Referring to FIGS. 12, 13, and 14, shaft portion 1202 is welded to base portion 1204 in order to form upright 1200, which may then be galvanized if desired. Upright 1200 is then pivotally connected to a ramp of a gangway such as ramp portion 1102 of gangway 1100 (FIG. 11) via a rod, bar, bolt, or other suitable device passing through aperture 1400, the support structure, and the ramp.
Referring to FIG. 15, a tube laser 1500 may be used to laser or otherwise cut continuous pieces 500, 900, and 1300 of tubular metal in order to form uprights 306, 308, and 1200, respectively. Each of continuous pieces 500, 900, and 1300 of metal is inserted into a holding mechanism 1502 of the tube laser, which moves and rotates the continuous piece while a C02 laser 1504 penetrates the metal. Tube laser 1500 further comprises a processor and a processor-readable medium containing computer instructions that, when executed by the processor, perform the function of providing a graphical user interface (“GUI”). The GUI allows a user to provide tube laser 1500 with the desired dimensions of continuous piece 500 of metal and the location and dimensions of the portions of the piece that need to be cut and removed in order to form uprights 306, 308, and 1200. Based on these instructions provided by the user, which are stored on the processor-readable medium, the processor instructs tube laser 1500, and more specifically, holding mechanism 1502 and laser 1504, how to rotate, move, and cut each continuous piece of metal. It should be understood that other suitable processes may be utilized to cut the continuous pieces of metal to form the uprights, including the use of a cutting drill, screw machine, mill, saw, or handheld plasma or flame torch. It should be understood by those of ordinary skill in the art that lateral posts 310 and 312 may be constructed in a similar manner. For instance, two tubular pieces of metal may be lasered or cut in order to define tabs and inserts 1002, 1004, 1006, and 1008 of respective posts 310 and 312.
While one or more preferred embodiments of the invention have been described above, it should be understood that any and all equivalent realizations of the present invention are included within the scope and spirit thereof. The embodiments depicted are presented by way of example only and are not intended as limitations upon the present invention. Thus, it should be understood by those of ordinary skill in this art that the present invention is not limited to these embodiments since modifications can be made. Therefore, it is contemplated that any and all such embodiments are included in the present invention as may fall within the scope and spirit thereof.
Patent Grant
8782838
