Weldless rebar chairs

Abstract

A form for creating a weldless rebar chair has an elongate rod arranged along a predetermined direction, said rod being formed into at least a plurality of partial elongate loops spaced from each other along the predetermined direction and arranged in a common plane defined by the elongate rod and the elongate loops. A method of producing a weldless rebar chair comprising the steps of arranging an elongate rod along the predetermined direction and bending it to create the elongate loops spaced and bending the loops at transition points to form intermediate portions arranged in a common plane and free ends that extend in directions normal to the plane, alternate free ends being bent in opposite directions and having lengths that are substantially equal to provide legs that can be placed on a surface to stabilize the rebar chairs.

What is claimed: 
     
         1 . A form for creating a weld-less rebar chair comprising a continuous elongate rod arranged along a predetermined direction, said rod being formed into at least a plurality of loops extending substantially equal distances in a common direction normal to said predetermined direction spaced from each other along said predetermined direction and arranged in a common plane defined by said elongate rod and said elongate loops. 
     
     
         2 . A form as defined in  claim 1 , wherein said loops are elongate loops. 
     
     
         3 . A form as defined in  claim 1 , wherein said loops are open loops. 
     
     
         4 . A form as defined in  claim 1 , wherein said loops are closed loops. 
     
     
         5 . A form as defined in  claim 1 , wherein said elongate rod is made of ASTM A1035 CS Grade 100 steel. 
     
     
         6 . A form as defined in  claim 1 , wherein said elongate rod is made of ASTM A1035 CS Grade 120 steel. 
     
     
         7 . A form as defined in  claim 1 , wherein said elongate rod is made of steel that achieves yield strength between 100 and 120 Ksi of the ASTM A1035 specification while maintaining ductility and tensile-to-yield ratio above 1.25. 
     
     
         8 . A weld-less rebar chair comprising an elongate rod arranged along a predetermined direction, said rod being formed into at least a plurality of loops extending substantially equal distances in a common direction normal to said predetermined direction spaced from each other along said predetermined direction, said loops having free ends and intermediate portions between said free ends and said elongate rod, said intermediate portions being arranged in a common plane defined by said elongate rod and said intermediate portions and said free ends being bent out of said common plane in directions generally normal to said intermediate portions, alternate free ends being bent in opposite orthogonal directions in relation to said common plane, said intermediate portions having lengths within said common plane that are substantially equal to provide legs that can be placed on a surface to stabilize the rebar chair. 
     
     
         9 . A weld-less rebar chair as defined in  claim 8 , wherein said loops are elongate loops. 
     
     
         10 . A weld-less rebar chair as defined in  claim 8 , wherein said loops are open loops. 
     
     
         11 . A weld-less rebar chair as defined in  claim 8 , wherein said loops are closed loops. 
     
     
         12 . A weld-less rebar chair as defined in  claim 8 , wherein said elongate rod is made of ASTM A1035 CS Grade 100 steel. 
     
     
         13 . A weld-less rebar chair as defined in  claim 8 , wherein said elongate rod is made of ASTM A1035 CS Grade 120 steel. 
     
     
         14 . A weld-less rebar chair as defined in  claim 8 , wherein said elongate rod is made of steel that achieves yield strength between 100 and 120 Ksi of the ASTM A1035 specification while maintaining ductility and tensile-to-yield ratio above 1.25. 
     
     
         15 . A method of producing a form for creating a weld-less rebar chair comprising the steps of selecting a length of an elongate continuous rod and arranging it along a predetermined direction; bending said rod to create a plurality of loops extending substantially equal distances in a common direction normal to said predetermined direction spaced from each other along said predetermined direction in a common plane defined by said elongate rod and said elongate loops. 
     
     
         16 . A method as defined in  claim 15 , wherein said loops are open loops. 
     
     
         17 . A method as defined in  claim 15 , wherein said loops are closed loops. 
     
     
         18 . A method as defined in  claim 15 , wherein said elongate rod is made of ASTM A1035 CS Grade 100 steel. 
     
     
         19 . A method as defined in  claim 15 , wherein said elongate rod is made of ASTM A1035 CS Grade 120 steel. 
     
     
         20 . A method as defined in  claim 15 , wherein said elongate rod is made of steel that achieves yield strength between 100 and 120 Ksi of the ASTM A1035 specification while maintaining ductility and tensile-to-yield ratio above 1.25. 
     
     
         21 . A method of producing a weld-less rebar chair comprising the steps of selecting a length of an elongate continuous rod and arranging it along a predetermined direction; bending said rod to create at least a plurality of loops extending substantially equal distances in a common direction normal to said predetermined direction spaced from each other along said predetermined direction, bending said loops at transition points to form intermediate portions arranged in a common plane defined by said elongate rod and said intermediate portions and free ends that extend out of said common plane in directions generally normal to said intermediate portions, alternate free ends being bent in opposite orthogonal directions in relation to said common plane, said intermediate portions having lengths within said common plane that are substantially equal to provide legs that can be placed on a surface to stabilize the rebar chairs. 
     
     
         22 . A weld-less rebar chair comprising an elongate rod arranged along a predetermined direction and defining an axis, said rod being formed into at least a plurality of loops extending substantially equal distances in a direction normal to said predetermined direction spaced from each other along said predetermined direction, alternate loops being angularly offset relative to a plane passing through said axis and each forming angles with said plane less than 90°. 
     
     
         23 . A method of producing a weld-less rebar chair comprising the steps of selecting a length of an elongate continuous rod and arranging it along a predetermined direction and defining an axis; bending said rod to create at least a plurality of loops extending substantially equal distances in a direction normal to said predetermined direction spaced from each other along said predetermined direction; and angularly offsetting alternate loops about said axis to opposite sides of a plane passing through said axis and each forming angles with said plane less than 90°.