Abstract: A break-away coupling is formed of metal and has a central axis and a necked-down central region formed by two inverted truncated cones each having larger and smaller bases. The cones are joined at the smaller bases by a narrowed transition region having an exterior surface formed by a curved surface of revolution having an inflection point of minimum diameter substantially midway of the coupling along the axis. The cones each define an angle ?1 and ?2, respectively, at each of the larger bases, wherein both ?1 and ?2 are selected to be within the range of 20°-40° and, preferably within the range of 30°-37°.

Abstract: A break-away coupling is formed of metal and has a central axis and a necked-down central region formed by two inverted truncated cones each having larger and smaller bases. The cones are joined at the smaller bases by a narrowed transition region having an exterior surface formed by a curved surface of revolution having an inflection point of minimum diameter substantially midway of the coupling along the axis. The cones each define an angle ?1 and ?2, respectively, at each of the larger bases, wherein both ?1 and ?2 are selected to be within the range of 20°-40° and, preferably within the range of 30°-37°.

Abstract: A break-away coupling has a central axis and a necked-down central region formed by two inverted truncated cones having larger and smaller bases joined at the smaller bases by a narrowed transition region in the form of a catenoid having a radius R and a central plane of symmetry at its inflection point of minimum diameter. The length of the side of cone between the bases is equal to 1, the distance along the axis between each large base and the central plane equal to H, and: H 2 = R 2 + 1 2 Sin ? ? ? = h 1 l Where H = ( 0.521 - R ) 2 + ( 0.57 ) 2 , BC = R , and l = ( 0.521 - R + R 2 - h 2 2 ) 2 + ( h 1 ) 2 H = h 1 + h 2 where h1=height of cones between bases, and h2=axial distance along central axis between each smaller base and the central plane.

Abstract: A break-way coupling with spaced weakened sections includes a central controlled breaking region and rigid threaded bolts at each end for connection to a base at one end and to a pole or the like at the other end. The controlled breaking region includes two axially spaced necked-down portions of smaller diameter and solid cross-section. Where the axil length of the controlled breaking region is L and the necked-down portions have a diameter D, the dimensions D and L are selected so that the ratio D/L is within the range D/L.ltoreq.0.3. The necked-down portions have conical tapered surfaces to insure that at least one of the necked-down portions break upon bending prior to contact between any surfaces forming or defining the necked-down portions.

Abstract: A safety roadway delineator includes one or more elongate recessed marker surfaces which are coated with a reflective material, preferably a retroreflective material such as reflective glass beads. The recessed marker surfaces are vertical or at least inclined to the horizontal to insure water run-off and are formed either directly in cast-in-place concrete roadway members or in pre-cast polymer concrete facing panels which are attached to the cast-in-place concrete roadway members. The roadway delineator is substantially continuously protected from normal wear and reliably exhibits reflectivity both under dry and rainy weather conditions.

Abstract: A universal safety device includes, in one embodiment, a cross bar frame and, in another embodiment, a flat platform. Cables extend through the frame or platform, with gripping brackets at the lower ends of the cables configurated and dimensioned to secure lower gripping surfaces of an item to be lifted or moved, such as the lips or lifting rims, or lower recesses or indentations typically provided of sand-filled inertial barriers or crash cushions. Locking members are provided for maintaining the brackets in engagement with the lower gripping surfaces of the items to be lifted and a girth cable or belt is placed around the item to be lifted which circumscribes the downwardly depending cables to prevent accidental release thereof during lifting or movement.

Abstract: A safety roadway delineator includes one or more elongate recessed marker surfaces which are coated with a reflective material, preferably a retroreflective material such as reflective glass beads. The recessed marker surfaces are vertical or at least inclined to the horizontal to insure water run-off and are formed either directly in cast-in-place concrete roadway members or in pre-cast polymer concrete facing panels which are attached to the cast-in-place concrete roadway members. The roadway delineator is substantially continuously protected from normal wear and reliably exhibits reflectivity both under dry and rainy weather conditions.

Abstract: A low profile break safe breakaway system is described for mounting a post or the like in a vertical position on a footing. The system includes load concentrating elements on brackets disposed on opposite sides of the post to be supported. Breakaway members are provided which cooperate with the load concentrating elements and which are threadedly inserted into anchors which are embedded in the footing. The anchors include steel bar loops which extend downwardly into the footing and internally threaded elements at the upper ends of the anchors. Annular collars are provided at the upper ends of the anchor internally threaded members at the surface of the footing to prevent shattering of the footing concrete on application of bending moments of the coupling members.