Portable security system

A portable security system comprises two security units, located on opposite sides of a roadway or other path for vehicles, each consisting of at least two hollow barrier devices filled with a ballast material such as water, sand, chunks of rubber or the like. Adjacent barrier devices in each security unit are interconnected side-by-side using first and second beams, which extend through respective fork lift openings formed in the center of the barrier devices. A gate spans the two security units, and is movable between an open position permitting the passage of vehicular traffic along the roadway and a closed position.

DETAILED DESCRIPTION OF THE INVENTION Referring now to FIG. 1 , the portable security system of this invention comprises two security units 8 and 9 located on opposite sides of a roadway or other path for the transit of vehicles. Each security unit 8 , 9 , in turn, consists of two barrier devices 10 which are mounted side-by-side in a manner described in detail below. The construction of the barrier devices 10 shown in FIG. 1 is identical, and therefore only one is described in detail herein. Each barrier device 10 comprises a top wall 12 , a bottom wall 14 , opposed end walls 16 , 18 , and, opposed sidewalls 20 , 22 which are interconnected to collectively define a hollow interior. In the presently preferred embodiment, each of the walls 12 - 22 are formed of a semi-rigid plastic material chosen from the group consisting of low density polyethylene, acrylonitrile or butadiene styrene, high impact styrene, polycarbonates and the like. These plastic materials are all inherently tough and exhibit good energy absorption characteristics. They will also deform and elongate, but will not fail in a brittle manner at energy inputs which cause other materials to undergo brittle failure. Additionally, materials of this type are unaffected by weather and have excellent basic resistance to weathering, leaching and biodegradation. Additives such as ultraviolet inhibitors can be added thereto, making such materials further resistant to the effects of weather. They also retain their mechanical and chemical properties at low ambient temperatures. The hollow interior is preferably filled with a “ballast” material such as water or other liquid, or a flowable solid material such as sand, concrete and the like. For this purpose, the walls 12 - 22 of barrier device 10 have a thickness in the range of about one-eighth inch to one inch so as to perform satisfactorily in service. The barrier device 10 is preferably in the range of about six to eight feet in length, and, at the wall thickness noted above, has a weight when empty of about 80 to 140 lbs. When filled with a liquid such as water, the overall weight of the barrier is in the range of about 1400 to 2200 lbs. Flowable solid material such as sand and the like increase the weight of barrier device 10 further. Each sidewall 20 and 22 includes a substantially vertically extending curb reveal 26 which extends from the bottom wall 14 to a horizontally extending ledge or step 28 best shown in FIG. 1 . Preferably, the curb reveal 26 has a vertical height of nine inches, measured from the bottom wall 14 upwardly. The horizontal extent of the step 28 is preferably on the order of about 1½ inches measured in the direction from the outer edge of curb reveal 26 toward the hollow interior 24 of barrier device 10 . Extending upwardly at an acute angle from the step 28 is an intermediate section 30 which terminates at a vertically extending upper section 32 . The upper section 32 , in turn, extends from the intermediate section 30 to the top wall 12 of barrier 10 which is formed with a pair of fill holes 33 preferably having a diameter in the range of about 3-4 inches. Additionally, a number of stabilizers 34 are integrally formed in the intermediate section 30 , at regularly spaced intervals between the end walls 16 , 18 . In the presently preferred embodiment, a pair of hollow sleeves 36 are located within the hollow interior of each barrier device 10 and extend between the sidewalls 20 , 22 . For ease of illustration, only one of the sleeves 36 is shown in the Figures. A portion of each sleeve 36 is located in the intermediate section 30 of each sidewall 20 , 22 , and extends partially into the upper sections 32 thereof. The two sleeves 36 are positioned in the spaces between the three stabilizers 34 formed in the sidewalls 20 , 22 , and provide added internal support to the barrier 10 so that it retains its shape when filled with a ballast material. Each of the sleeves 36 define a pass-through hole or channel adapted to receive the tines of a forklift truck to permit handling of the barrier devices 10 . These pass-through holes are also used to mount the beam structure for connecting to barrier devices 10 side-by-side. With reference to FIG. 2, a first beam 38 and a second beam 40 each have a reduced diameter section 42 at opposite ends which is sized to fit within the pass-through holes formed by the sleeves 36 in the barrier devices 10 . The beams 38 , 40 are preferably formed of steel or other rigid material. As best seen in FIG. 1 , the reduced diameter sections 42 protrude beyond the surface of the side wall 20 of one barrier device 10 and beyond the surface of side wall 22 of the other barrier device 10 in each of the security units 8 and 9 . Each reduced diameter section 42 is positioned to mount an angle bracket 44 formed with holes 46 which align with holes 48 in the sections 42 to receive bolts 50 . In order to provide additional stability and a platform for mounting other structure, as described below, a steel plate 52 is secured between the first and second beams 38 , 40 . Aligning bores 54 and 56 formed in the plate 52 and beams 38 , 40 , respectively, receive bolts 50 to mount same together. In one presently preferred embodiment, the plate 52 mounts one end of a gate arm 60 which spans the space between the security units 8 and 9 . See FIG. 1 . The gate arm 60 is preferably formed of metal, fiberglass or plastic and carries an endless cable 62 which extends along the length of the gate arm 60 and forms a loop 64 at one end. As best shown in FIG. 3 , the loop 64 of cable 62 is releasably connected to a hook 66 with the gate arm 60 in the closed position. The hook 66 , in turn, is mounted by a U-shaped connector 68 to the plate 52 . The opposite end of cable 62 is looped around the second beam 40 of the security unit 9 to secure it in place. See FIG. 1 . As schematically depicted in FIG. 2 , the gate arm 60 is raised and lowered by operation of a motor 70 which rotates a shaft 72 connected to the gate arm 60 . The gate arm 60 may also be manually raised and lowered, if desired. Additionally, a strip of sharp objects (not shown) capable of puncturing vehicle tires can be attached to the gate arm 60 so that it lies on the roadway with the gate arm 60 in the closed position. In an alternative embodiment shown in FIGS. 4 and 5 , the gate arm 60 is replaced by a length of cable 74 formed with loops 76 at each end. In FIG. 4 , one loop 76 is releasably mounted to a hook 66 connected to the plate 52 of security unit 8 as described above in connection with a discussion of FIG. 3 , and the loop 76 at the opposite end of the cable 74 is connected to a shackle 77 mounted by a connector 68 to the plate 52 of security unit 9 . Alternatively, one end of the cable 74 may be mounted to one plate 52 using a number U-shaped connectors 68 as depicted in FIG. 5 , while the opposite end of cable 74 is releasably connected to a hook 66 . With the cable 74 in an extended position to block the passage of vehicles between the security units 8 , 9 , each end of the cable 74 is secured to a plate 52 . To permit the passage of vehicles between the security units 8 , 9 , one end of the cable 74 is detached from a hook 66 and the cable 74 is allowed to rest on the ground so that the vehicle can drive over it. While the invention has been described with reference to a preferred embodiment, it should be understood by those skilled in the art that various changes may be made and equivalents substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. For example, only two barrier devices 10 are shown in the Figs. as comprising the security units 8 and 9 . It should be understood that essentially any number of barrier devices 10 mounted side-by-side could be employed to form the units 8 , 9 if additional mass is desired. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.