Traffic barrier chain

The traffic barrier was designed to give law-enforcement officers an effective traffic barrier which can be easily carried in the trunk of a car and quickly deployed across a roadway and just as quickly, removed from the roadway as the situation warrants. There is no need for assembly or mechanical procedure, the chain is simply stretched across the roadway at a right angle to the direction of traffic and pulled taut. The traffic barrier chain is designed so that no matter how the chain is placed on the road surface, half of the splines will be facing the direction of the traffic flow at an angle of 45 degrees. The other half will be facing the other direction. Deployment of the traffic barrier chain is a preferable option to using an expensive patrol car for a road block, or attempting to shoot out the tires or radiator of a vehicle. The traffic barrier chain would be a useful addition to the entries of security facilities where traditional gates are vulnerable to breech by ramming with a vehicle.

BRIEF SUMMARY OF THE INVENTION 
The traffic barrier chain is a chain with splines attached to its links in 
such a way that when laid across a roadway, a sufficient number of the 
splines will be at an optimum angle to the roadway so that they would 
puncture the tires of any vehicle failing to yield to the barrier. 
The object of the invention is to provide a sturdy, yet flexible traffic 
barrier which can be quickly and effectively deployed; while being 
portable to the extent that it could be just as quickly removed from the 
roadway and placed in the trunk of a car.

DETAILED DESCRIPTION 
The traffic barrier chain consists of a series of two primary elements, a 
chain comprising links 1, 3, 5, 7, . . . , and metal splines 2, 4, 6, 8, . 
. . , shown in FIG. 1 and FIG. 2. The spline 2 is placed through the link 
1 to a point midway on the spline 2 and to one side of the link 1 so that 
the spline 2 comes into contact with the next adjacent link 3. The spline 
2 is attached to both the link 1 and adjacent link 3 by either welding or 
blazing the adjoining surfaces. Attaching the spline 2 in this way makes 
the joint at link 1 and link 3 rigid. A spline 4 is inserted through link 
3 to a point midway on spline 4 and to one side of link 3 so that the 
spline 4 comes into contact with link 1. The spline 4 is then welded or 
blazed to the adjoining surfaces of link 1 and link 3. This further adds 
to the rigidity of the joint connecting link 1 and link 3 and fixes spline 
2 and spline 4 at right angles to one another. The joint connecting link 3 
and link 5 is not welded or blazed and the links 3 and 5 maintain the 
ability to swivel in the joint. Spline 6 is inserted through link 5 to a 
point midway on spline 6 and to one side of link 5 so that spline 6 comes 
into contact with link 7. The adjoining surfaces are then welded or blazed 
making the joint connecting link 5 and link 7 rigid. Spline 8 is then 
inserted through link 7 to a point midway on spline 8 and to one side of 
link 7 so that spline 8 comes into contact with link 5. The adjoining 
surfaces are then welded or blazed adding to the rigidity of the joint 
connecting 1 link 5 and link 7 and fixing spline 8 at a right angle to 
spline 6. The joint connecting link 7 and link 9 is not welded or brazed 
so that it retains its flexibilty. This process continues throughout the 
length of the chain until the desired number of splines are attached. 
Splines are not attached to the end links, link 11 and link 13 so as to 
facilitate attaching the traffic barrier chain to another chain, a stake, 
or a fixed mounting point. Consecutive splines are fixed at right angles 
to one another. Both ends of each spline are cut or ground to a point or 
angle, FIG. 3, sufficient enough to puncture an inflatable tire. When set 
on a surface 15 FIG. 4 the splines will be at a 45 degree angle in 
relation to the surface 15. When the chain is deployed on a flat 
horizontal surface and pulled taut the splines intersect the longitudinal 
axis of the chain at right angles. 
While the above description contains many specificities, these should not 
be construed as limitations on the scope of the invention, but rather as 
an exemplification of one preferred embodiment thereof. Many other 
variations are possible, for example the splines could be press-fitted 
rather than being welded or brazed. The splines rather than round, could 
be square, triangular, or any of a number of shapes. The splines could be 
cast or forged as part of the link when the link is manufactured saving 
further assembly. The traffic barrier chain could be made entirely of a 
strong lightweight plastic.