Displaceable guard rail barriers

Claim 2

A longitudinal displaceable barrier assembly for intercepting and redirecting errant vehicles leaving a roadway comprising a series of skid assemblies each having a lower skid member resting, without attachment, on a supporting surface adjacent said roadway, said skid assemblies also having a support structure positioned above said support surface, and a series of essentially horizontal rails or beams carried by said support structure and extending along the length of said roadway for lateral impact by an errant vehicle, said rails or beams disposing said skids in predetermined spaced relation with each other and with said skid members extending essentially normal to the direction of said roadway, said skid members being slidably laterally displaceable on said support surface upon lateral impact of an errant vehicle with said rails or beams.

Claim 3

The barrier assembly according to claim 1 wherein said rails or beams are positioned substantially at the height of the center of gravity of typical vehicles.

Claim 4

The barrier assembly according to claim 1 wherein the displacement of the barrier assembly is limited by free-standing masses or surface-engaging mechanical means positioned behind the rail/beam members.

Claim 5

The barrier assembly according to claim 1 wherein the initial inertial resistance of the barrier assembly is reduced by a pivoting linkage between the rails or beams and said support structure.

Claim 6

The barrier assembly according to claim 1 wherein the lateral displacement of the barrier assembly and rearward overturning impact forces are limited by a cable in tension threaded through the skid assemblies proximate to the center of gravity of typical vehicles and behind the horizontal rails or beams.

Claim 7

A longitudinal displaceable barrier assembly for intercepting and redirecting errant vehicles leaving a roadway comprising a series of skid assemblies each having a lower skid member adapted to rest, without attachment, on a supporting surface adjacent said roadway, said skid assemblies also having a support structure positioned above said support surface, and a series of essentially horizontal rails or beams carried by said support structure and extending along the length of said roadway, said rails or beams disposing said skids in predetermined spaced relation with each other and with said skid members extending essentially normal to the direction of said roadway, the rearmost portion of the lower skid member being upturned at an angle on the order of 15° relative to the supporting surface to provide a secondary skid/surface interface which automatically raises the level of the vehicle/beam contact upon severe impact.

Claim 8

A longitudinal displaceable barrier assembly for intercepting and redirecting errant vehicles leaving a roadway comprising a series of skid assemblies each having a lower skid member adapted to rest, without attachment, on a supporting surface adjacent said roadway, said skid assemblies also having a support structure positioned above said support surface, and a series of essentially horizontal rails or beams carried by said support structure and extending along the length of said roadway, said rails or beams disposing said skids in predetermined spaced relation with each other and with said skid members extending essentially normal to the direction of said roadway, the rearmost portion of the lower skid member being upturned at an angle on the order of 15° relative to the supporting surface to provide a secondary skid/surface interface which automatically raises the level of the vehicle/beam contact upon severe impact.