280, the structure 220 can be said to wrap around the edge region of the panelboard cover when the panelboard guard is used to secure the panelboard.

The wrap around mounting structure 220 may be formed by appropriately bending one of the ends of the rectangular material from which the strap 20 is constructed so the groove 232 is formed and inserting the short portion 224 of the L-shaped member into the groove. The cantilever portion is formed by the long portion of the L-shaped member extending from the groove along, and parallel to, the bottom surface 28 of the strap 20. Because the outer wall 228 of the groove extends below bottom surface 28 of the strap 20, by flushing the cantilever portion with the bottom of the outer wall of the groove, the gap 280 is defined between the bottom surface 28 of the strap and the cantilever portion into which a panelboard cover can be inserted. According to one embodiment, the outer wall of the groove can extend approximately ⅛ of an inch below the bottom surface of the strap, which in turn provides approximately a ⅛ inch gap 280 into which a panelboard cover can be placed. It should be understood, however, that the gap 280 between the bottom surface of the strap and the cantilevered portion can be modified in order to accommodate different cover thickness over which the panelboard guard is to be placed.

In some embodiments, the long potion 226 of the L-shaped member 222 is generally rectangular in shape and generally continuous along its extents. Alternatively, as shown in FIG. 2E, which is an isometric view of an embodiment of the L-shaped member 222, the long portion 226 may have a slot or notch 225 defined therein. Such a notched configuration as illustrated in FIG. 2E is advantageous in those instances when there is concern the panelboard cover might be removed in an attempt to defeat the guard assembly 10 by removal of the screws holding the panelboard cover in place to the rest of the panelboard. Specifically, the notch 225 in the long portion 226 of the L-shaped member 222 allows the wrap around mounting structure 220 to be centered over a panelboard screw when the structure 220 receives the edge of the panelboard cover in the gap 280, the shaft of the screw being received in the notch 225 and the bottom surface 28 extending over the screw head so as to prevent the removal of the screw when the guard 10 is used to secure the panelboard.

Alternatively, the notch 225 in the long portion 226 of the L-shaped member 222 can be placed directly behind the screw head located in the front of the panelboard cover as shown in FIG. 7. More specifically, in this configuration the panelboard cover is no longer inserted in the gap 280 created between the long portion of the L-shaped member and the bottom surface of the strap, but instead the long portion of the L-shaped member is flush against the top surface of the panelboard cover with the screw shaft placed in the notch 225 and the screw head received in the gap 280.

As shown in FIGS. 2A, 2B, and 2D, the short portion of the L-shaped member is secured inside the groove by a pair of rivets 234, 236 that are placed in a set of openings formed in both of the groove defining walls 228, 230. According to one embodiment, the holes through which the rivets are placed are approximately 5/32 inches in diameter, with the centerline located at approximately ¼ inches from both the top edge 237 and the side edge 238 of the groove defining walls. However, it should be understood, that any other form of suitable attachment means can be used to secure the L-shaped member in the groove. As discussed above, because the L-shaped member is meant to wrap around an edge of a panelboard cover and thus might be in contact with electrical components located inside the panelboard, the L-shaped member is preferably constructed from an electrically non-conductive material such as, for example, plastics, polymers, or composites, and can be made from a different material than the material from which the strap is constructed. For example, the straps 20, 30 may be formed of steel, aluminum, plastics, polymers, or composites.

Similarly to the first strap 20, the second strap 30 shown in FIGS. 3A-3C can be made from a rectangular shaped strip of material. The strap 30 also has an outer first end 32 and an inner second end 34 opposite and spaced apart from the outer first end. The strap 30 also includes a top surface 36 and bottom surface 38. At the outer first end is located a wraparound mounting structure 320 similar to the structure 220 described above with respect to FIGS. 2A-2E that allows the strap 30 to attach the panelboard guard 10 to the panelboard cover. As shown in FIGS. 3A-3C, at the inner second end 34 is a vertically extending side wall 302 with an aperture 39 that includes a threaded insert 304 through which the threaded member 42 of the adjusting mechanism 40 can threadably displace. According to one embodiment, the vertically extending side wall 302 can be approximately 1¼ inch in height and 1 inch in width, with the centerline of the aperture placed at approximately ½ inch from both the upper edge 306 and side edge 308 of the vertically extending side wall. In one embodiment, the threaded insert 304 is secured in the aperture 39 via an interference fit or welding.

Now the discussion will turn to the adjusting mechanism 40 located in the center of the panelboard guard 10. As shown in FIG. 4, which is an enlarged side view of the adjusting mechanism 40, the adjusting mechanism includes a threaded member 42 and an Allen nut 46. The threaded member, according to one embodiment, can be an eye bolt having a hole 44 in the handle at one end for accepting PPE locking devices. Accordingly, the hole of the eye bolt is sized such that any of the conventional lockout or tag-out devices can be placed through the hole. The Allen nut 46 is attached to the other end of threaded member located at the end opposite the hole once the panelboard guard is assembled as shown in FIG. 1. In particular, once the threaded member is inserted through the aperture 29 in the side wall 202 of the strap 20 and screwed through the threaded rivet 304 in the side wall 302 of the strap 30, the allen nut is fused to the threaded member using such techniques as for example welding, mechanical crimping, adhesives, etc. in order to ensure that the panelboard guard cannot be disassembled or tampered with while the panelboard guard is being used.

For a discussion of how the above-discussed elements are assembled together in the panelboard guard device 10, reference is once again made to FIG. 1. As shown in FIG. 1, the straps 20 and 30 are placed adjacent to each other. More specifically the inner ends 24 and 34 of the straps 20 and 30 are placed next to each other in an end to end configuration. The threaded member 42 of the adjusting mechanism 40 is then placed through the opening 29 in the vertically extending sidewall 202 of the strap 20 and threaded through the threaded rivet 304 in the vertically extending sidewall 302 of the strap 30 with the hole 44 for accepting the PPE locking devices located within the first U-shaped structure 212 of the strap 20. Orienting the threaded member such that the opening 44 is located between the vertically extending sidewalls 202 and 204 prevents disassembling or tampering with the panelboard guard once it is secured to a panelboard cover via the wrap around structures 220, 320 engaging opposite edges of the panelboard cover and a PPE locking device secured through the hole 44. In other words, because the end of the threaded member with the opening 44 is confined within the first U-shaped structure 212, once a locking device is placed in the opening 44 of the threaded member, the adjusting mechanism 40 can no longer be rotated relative to the straps 20, 30 and, as a result, the panelboard guard 10 cannot be disassembled or adjusted with respect to its overall length. This insures that the panelboard guard cannot be inadvertently removed or tampered with.

The discussion will now turn to a method of employing the panelboard guard 10 to secure a panelboard. FIGS. 5A-5C and FIG. 7 are perspective views of a panelboard 500 with a panelboard guard 10 attached to it. As shown in FIGS. 5A-5C and FIG. 7 a panelboard 500 includes a panelboard cover 502 and panelboard access door 504. The panelboard cover is attached to the panelboard with screws 506. According to one embodiment, the panelboard guard 10 can be placed horizontally across the face of the panelboard in an area that will cross and capture the access door 504 of the panelboard to be secured. More specifically, the wrap around mounting structures 220 and 320 are first wrapped around the outside edges 508 and 510 of the panelboard cover such that the outside edges 508 and 510 are received in the respective gaps 280 of the structures 220 and 320 and the straps 20 and 30 are caused to extend across the face of the access door 504 and cover 502 such that the bottom surfaces 28 and 38 of the respective straps generally abut the planar surfaces of the access door and cover.

It may be deemed beneficial to protect against the guard 10 being defeated by the removal of the panelboard cover 502 via removal of the screws 506. The guard 10 can be mounted on the panelboard 500 in such a manner as to protect against the guard 10 being defeated by removal of screws. Specifically, the outside edges 508 and 510 of the panelboard cover can be received in the respective gaps 280 with the straps 20 and 30 extending directly over in close proximity to the screw head and the screw shafts being received in the respective notches 225. With the guard 10 so arranged relative to the screws, the screws cannot be rotated outward to any extent that would allow the panelboard cover to be removed.

Alternatively, as shown in FIG. 7, after the screw 506 is loosened, the notch 225 in the long portion of the L-shaped member can be placed around the screw shaft such that the long portion of the L-shaped member is between the top surface of the panelboard cover and the bottom surface of the screw head.

With the guard 10 so engaged with the panelboard cover, the adjusting mechanism 40 is tightened by threading threaded member 42 through the threaded insert 304 so as to bring the opposed faces 29 and 39 of the respective straps 20 and 30 closer together, thereby shortening the overall length of the guard 10 between its opposite ends 12 and 14 in order to pull the straps 20 and 30. By pulling the straps 20 and 30 together in such a manner, the panelboard cover edges 508 and 510 are caused to be deeply received in the respective wrap around structures 220 and 320, thereby preventing the guard 10 from being removed from the panelboard cover and preventing the panelboard access door from being opened. In other words, the panelboard guard is secured across the panelboard by first securing the first and second end 12 and 14 of the panelboard guard under the outside edges of the panelboard cover using the wrap around mounting structures 220 and 320. The straps are then pulled together by threading the threaded member 42 through the threaded insert 304 such that the eyebolt opening 44 is caused to move towards the threaded member 42, thereby bringing the planar faces 29 and 39 towards each other.

As shown in FIGS. 5B and 5C, once the panelboard guard is securely attached to the panelboard cover, different types of PPE lockout and or tag-out devices can be used to prevent tampering with or disassembling of the panelboard guard and thus ensure that the access to the panelboard and/or the circuit breakers inside the panelboard is restricted. For example, one such lockout/tagout device can include a simple padlock with a padlock 520 as shown in FIG. 5B or a safety lockout hasp 530 for multi-users as shown in FIG. 5C. In either case, the lockout device has a portion that extends through the hole 44 in the eyebolt end of the adjusting mechanism 40 and through both the outward projecting U-shaped region 212 and the inward projecting U-shaped region 210. Because the lockout device extends through the hole 44 and the first strap 20 extends through the lockout device on account of the lockout device also extending through both U-shaped regions 210 and 212, the lockout device cannot be caused to rotate relative to the first strap 20 and the adjustment mechanism 40 cannot be caused to rotate relative to the first strap 20 or second strap 30, thereby preventing adjustment of the overall length of the guard 10 and its unapproved removal from panelboard cover.

FIGS. 6 and 8 illustrate a design for a panelboard guard assembly 10 without the U-shaped regions 210 and 212 on the first strap 20. The first strap 20 is generally flat, with the strap bottom surface 28 extending continuously and uniformly from the first outer end 12 to the inner second end 24. As shown in FIG. 8, the first strap 20 includes a tab 21 with an aperture 23 for receiving a lockout/tagout device. The tab 21 is positioned in a general area where the outwardly projecting U-shaped region 212 was located in FIG. 2A. The tab 21 is positioned substantially perpendicular to both the top surface 26 and the inner second end 24 of the first strap 20. The size of the aperture 23 and the location of the tab 21 on the first strap 20 are such that a safety lockout padlock 520 or a safety lockout hasp 530 can extend through the aperture 23 and an eyebolt opening 44.

The adjustment mechanism in FIG. 8 includes a threaded member 42 with an opening 44, a fiber washer 41, and a non-threaded rivet nut, bushing or spacer 205 on the first strap 20. The fiber washer 41 (hidden inside the non-threaded rivet nut 205) mitigates contact between the eyebolt portion 44 of the threaded member 42 and the non-threaded rivet nut 205, and the non-threaded rivet nut provides a smooth bearing surface for the threaded member 42 to rotate. The non-threaded rivet nut 205 can be riveted, welded, or otherwise fastened to the inner second end 24 of the first strap 20. On the inner second end 34 of the second strap 30, the threaded member 42 is threadably received by a threaded insert 304, which can be a threaded rivet or similar device. As in FIG. 1 and other figures, the threaded member 42 can include an Allen nut 46. In the FIG. 8 orientation, when the threaded member 42 is tightened, the first and the second straps 20 and 30 are pulled together. When the threaded member 42 is tightened sufficiently, so that the panelboard guard 10 is secured across the panelboard, the safety lockout padlock 520 or hasp 530 can extend through the aperture 23 of the tab 21 and the eyebolt opening 44 and lock accordingly. Similarly to embodiments with the U-shaped regions 210 and 212, when the lockout device 520 or 530 extends through both the eyebolt opening 44 and a portion of the first strap and is locked, the threaded member 42 cannot be loosened.

In FIG. 8, the outer ends 12 and 14 include pivotable end members 13 and 15 that are pivotably coupled to the straps 20 and 30 by shoulder rivets 43. The shoulder rivets 43 allow the end members 13 and 15 to rotate while still maintaining a secure connection between the end members and the straps 20 and 30. Additionally, fiber washers 41 can be used between the straps 20 and 30 and the end members 13 and 15. The pivotable end members 13 and 15 include relatively large contact surfaces between the outer ends 12 and 14 and the panelboard 508 and 510. The end members 13 and 15 can rotate so that each end member is substantially parallel to the straps 20 and 30. As a note, the wrap around mounting structures 320 and 220 that attach the outer ends 12 and 14 to the panelboard 508 and 510 need not be altered when the outer ends include the pivotable end members.

The panelboard assembly 10, in FIG. 8, can be straightened for storage, shipping, etc. by rotating the end members so that each is parallel to the straps 20 and 30, and positioning the straps 20 and 30 parallel to each other. The end members 13 and 15 can each be secured in the parallel orientation with the straps 20 and 30. Additionally, the pair of straps 20 and 30 with parallel end members 13 and 15 can be secured together for ease of handling and shipping. Once the panelboard assembly 10 is straightened, as described above, the straps 20 and 30, along with the parallel oriented end members 13 and 15, can be placed in a container for either storage or shipping. The panelboard assembly 10, in FIG. 8, can fit inside a 2.5″×27″ tube for convenient storage or shipping.

To remove the guard 10 from the panelboard cover, the lockout device is removed from the guard and the above-described installation method is reversed, including reversing the rotation of the threaded member 42 relative to the threaded insert 304 such that the distance between the hole 44 and the threaded insert 304 increases. Such rotation of the threaded member increase the overall length of the guard 10 and allows the wrap around structures 220 and 320 to be disengaged from the respective panelboard cover edges 508 and 510, thereby allowing the guard 10 to be removed from the panelboard and the panelboard access door 504 to be opened.

While the discussion given above with respect to FIGS. 1-5C is given in the context of the guard 10 employing an adjustment mechanism 40 having a threaded arrangement, in other embodiments, the adjustment mechanism 40 may have other arrangements. For example, in one embodiment, the adjustment mechanism 40 may be in the form of a lever operated ratchet mechanism or a cable/pulley operated come-along mechanism. In other embodiments, as illustrated in FIG. 6, adjustment mechanism 40 may be in the form of a bolt shaft 600 with a bolt head 602 at one end of the shaft and a series of holes 605 located along the shaft and spaced apart from each other in an incremental arrangement. The holes are sized such that at least one of a safety lockout padlock 520 or a safety lockout hasp 530 can extend through the holes. Once the outer ends 12 and 14 are attached to the respective edges 508 and 510 of the panelboard cover 502, the shaft 600 can be positioned relative to the two inner ends 24 and 34 so the overall length of the guard 10 is sufficiently short so as to keep the edges 508 and 510 securely received in the gaps 280 with no slack in the overall length of the guard 10. The padlock 520 or hasp 530 can then be passed through the specific hole that is closest to the inner end 34 with the bolt head 602 abutting against the inner end 24, as can be understood from FIG. 6.

FIGS. 9-11 illustrate another panelboard guard assembly 900 in accordance with the present disclosure. More specifically, FIG. 9 is a perspective view of the panelboard guard assembly 900, FIGS. 10A-10B are a bottom view and a side elevation views, respectively, of the panelboard guard assembly 900, and FIG. 11 illustrates the panelboard guard assembly 900 in use to prevent access to a panelboard.

As shown in FIGS. 9-10B, the panelboard guard assembly 900 includes a pair of members 902, 904 having a first end 906 and a second end 908, the second end 908 being spaced apart from the first end 906. The panelboard guard assembly 900 further includes an adjustment mechanism 910 extending between the members 902, 904. Similar to the previously discussed and illustrated implementations of FIGS. 1 and 6, in which the members 20, 30 were coupled by the adjustment mechanism 40, the adjustment mechanism 910 extends between the members 902, 904 and may be used to adjust the spacing between the first end 906 and the second end 908. In the illustrated implementations, for example, the adjustment mechanism 910 is an eyebolt that may be rotated to change the displacement between the first end 906 and the second end 908.

In certain implementations, the members 902, 904 may be approximately the same length; however, the members 902, 904 may also vary in length to accommodate different panelboard arrangements. Each member 902, 904 is generally defined by a respective outer end and a respective inner end. For example, the first member 902 includes an outer end 912 and an inner end 914 and the second member 904 includes an outer end 916 and an inner end 918 such that, when assembled, the outer end 912 of the first member 902 generally corresponds to the first end 906 of the panelboard guard assembly 900 and the outer end 916 of the second member 904 generally corresponds to the second end 908 of the panelboard guard assembly 900.

The inner end 914 of the first member 902 and the inner end 918 of the second member 904 each include respective end structures, which are generally referred to herein as end blocks 920, 922 and which are configured to, among other things, couple the members 902, 904 together. More specifically, the second member 904 extends through an aperture 924 of the first end block 920, which is coupled to the inner end 914 of the first member 902. Similarly, the first member 902 extends through an aperture 926 of the second end block 922, which is coupled to the inner end 916 of the second member 904. As a result, the first member 902 and the second member 904 at least partially overlap and the end blocks 920, 922 are disposed such that they are between the inner and outer ends of the opposite member. Although the first block 920 and the second block 922 constrain the second member 904 and the first member 902, respectively, each member 902, 904 is able to slide in an inward/outward direction relative to each other such that the overall length of the panelboard guard assembly 900 may be changed (e.g., by manipulating the adjustment mechanism 910 or, if the adjustment member 910 is removed, by simply pushing or pulling on the members 902, 904).

As illustrated in FIGS. 10A-10B, the adjustment mechanism 910 may be located at or near the center of the panelboard guard assembly 900 so as to extend through each of the first end block 920 and the second end block 922. In FIG. 10A, for example, the adjustment mechanism 910 includes a threaded member 928 extends through the second end block 922 and is received by the first end block 920, which generally includes a threaded surface configured to engage the threaded member 928. In certain implementations, the threaded surface may be formed in the end block 920; however, in the illustrated implementation, the threaded surface is provided by a barrel nut 932 (shown in FIG. 10A) or similar insert disposed within the end block 920. FIG. 12 is an isometric view of the barrel nut 932. As shown, the barrel nut 932 may include a cylindrical body 934 (or other shaped body insertable into the end blocks 920) through which a threaded hole 936 extends. The barrel nut 932 may also include a slot 938 or similar feature to facilitate placement and alignment of the barrel nut 932 within the end block 920. Accordingly, when disposed within the end block 920, the threaded hole 936 of the barrel nut 932 may be aligned to receive the threaded member 928.

In the specific implementation of FIGS. 9-11, each of the members 902, 904 includes a respective rod 928, 930 that extends through the end block of the opposite member. For example, the first member 902 includes a rod 928 that extends through an aperture 926 of the second end block 922 to couple with the first end block 920. Similarly, the second member 904 includes a rod 930 that extends through an aperture 924 of the first end block 920 to couple with the second end block 922. Although other coupling mechanisms and techniques may be used, the specific implementation of FIGS. 9-11 includes spring pins 964, 966 for coupling each of the rods 928, 930 to its respective end block 920, 922. The rods 928, 930 and apertures 924, 926 are shown as having a similar circular shape such that the rods 928, 930 may slide through the apertures 924, 926; however, in other implementations, the apertures 924, 926 and rods 928, 930 may have cross-sectional shapes that are other than circular provided that each rod 928, 930 is extendable through and is slidable within its corresponding aperture.

The outer end of each member 902, 904 generally includes a respective mounting structure 940, 942 for attaching the panelboard guard assembly 900 to a panelboard cover. More specifically, the outer end 912 of the first member 902 includes a first mounting structure 940 and the outer end 914 of the second member 904 includes a second mounting structure 942. Each of the mounting structures 940, 942 may be coupled to its respective rod 928, 930 using various methods. As illustrated in FIG. 10A, for example, each mounting structure 940, 942 is coupled to its respective rod 928, 930 by a respective spring pin, such as spring pin 960 for mounting structure 940 (the spring pin for mounting structure 942 being directed away from the view of FIG. 10). When in use, at least a portion of each of the mounting structures 940, 942 extends around a respective outer edge of the panelboard to attach the panelboard guard assembly 900 to the panelboard (such as illustrated in FIG. 11 and discussed below in further detail). Accordingly, each mounting structure 940, 942 may include a slot 948, 950 (or similar receiving structure, such as a channel) within which the outer edge of the panelboard is received.

One of the end blocks 920, 922 may define a slot, hole, or similar aperture 952. As discussed below and illustrated in FIG. 11, the aperture 952 is generally provided to facilitate locking out/tagging out of a panelboard. More specifically, the aperture 952 is positioned such that a lockout/tag-out device (e.g., a hasp or padlock) can be readily inserted through each of a portion of the adjustment mechanism 910 (here, an eye 911 of the adjustment mechanism 910) and the aperture 952. For example, when a padlock is used as a lockout/tag-out device, the shank of the padlock may be passed through each of the eye 911 and the aperture 952 before being inserted into the padlock body to lock the padlock. Similarly, in another application, the jaws of a lockout hasp may be inserted through each of the eye 911 and the aperture 952 before closing the jaws and locking the hasp.