TODAY’S PATENT – SPRING CONSTRUCTION

The SPRING CONSTRUCTION was invented by   Lawton H. Crosby (Lake Bluff, IL) on the 20^th  of July 1975 , bearing patent number US3969793A.

The aforementioned application discloses a major improvement in spring band attachment clips and assemblies. The present invention is related to  to that improvement and constitutes a further major advance in the art.One of the objective of the present invention is to provide an improved attachment clip which firmly anchors itself automatically on the rail. To prevent shock loads on the sinuous spring bands from momentarily urging the clip away from the frame rail, anti back off means are provided. With conventional, vertical rail frames, these anti back off means preferably take the form of depending, anti back off feet which engage the inner surface of the wood frame rail with the clip properly seated in operational relationship on the rail. Still another object is to provide an attachment clip which will not itself back off from a rail if spring band tension is suddenly released, nor allow the spring band end to disengage from the clip. It is yet another object to provide an attachment clip which is simple and inexpensive to fabricate.