Abstract: A high strength security fence for resisting penetration by vehicles. The fence has high strength line posts that support a plurality of tensioned high strength cables. In the preferred form, these cables are threaded through the posts. The cables are each encased in a conduit-type rail sheath (i.e., superstructure) that span the distance between the posts. Typically, at least one end of each cable is anchored within the concrete anchor of a post adjacent a line post supporting the cable. Cables can be anchored, and tensioned, at corner buttresses if desired. To improve the aesthetic appearance of the fence and to add further strength, the posts and rails can be encased in decorative superstructures, and vertical strengthening bars are joined to the rail superstructure. A clamp is described for joining the high strength fence to upright posts of conventional chain link fences or the like.

Abstract: A vehicle security barrier (10) for selectively prohibiting a vehicle from accessing a preselected area and for otherwise controlling vehicular traffic. The security barrier (10) comprises a base (12) defining a travelway (14) over which a vehicle can be driven. The base (12) comprises a forward end portion defining an entryway (20) whereby a vehicle enters onto the travelway (14) and a rearward end portion defining a travelway exit (22) whereby a vehicle exits the travelway (14). The security barrier (10) further comprises a security gate 918) pivotally mounted on the base (12) for being selectively raised to obstruct the travelway (14) and prohibit a vehicle from exiting the travelway via the travelway exit (22). Reciprocal actuating means are also provided for selectively raising and lowering the gate (18). In the preferred embodiment, the reciprocal actuating means comprises a first and second fluid actuated cylinder (64A and B).