Two-part collapsible corrugated paper form void
AssigneeSurevoid Products, Inc.
InventorsRobert C. Gates, Michael L. Turner
Life of this patent
Estimating the term…
Abstract
A two-part collapsible form void for providing a space between a poured concrete structure and an underlying expansive soil is formed of a foldable outer section and a foldable inner section which, when erected, is longitudinally slidable into the erected outer section. The form void may be shipped in the separated and collapsed state, reducing shipping volume by up to 85 percent, and is easily erected by hand at the job site.
Claims16
A two-part collapsible form void for establishing a space in or adjacent to a concrete structure, including:
- an outer part comprising,
- a first sheet of planar material folded over onto itself along a longitudinal fold line and forming first and second portions, wherein said first portion is defined by joined together coextensive strips along two adjacent sides to form a bottom flange, and wherein said second portion is defined by the remainder of the folded first sheet, said second portion having,
- parallel longitudinal fold lines defining an upper panel, a coextensive base panel, a first side panel and a second side panel, and second strut panels attached to the middle sheet along first and second longitudinal fold lines, said strut panels, in the erected position of the void form, depending downwardly at an angle from the middle sheet, whereby said strut panels extend between the middle sheet and the said parallel longitudinal fold lines which define an intersection between the base panel and the first and second side panels.
A two-part collapsible form void for establishing a space in or adjacent to a concrete structure, comprising:
- an outer part formed of a first sheet of planar material wherein said first sheet is centrally folded longitudinally and coextensive longitudinal strips along two adjacent sides are joined by adhesive, said joined strips comprising a bottom flange, said first sheet provided with parallel longitudinal fold lines defining an upper panel, a coextensive base panel, a first side panel and a second side panels whereby said first sheet is erected to a rectangular parallelogram cross-section with said bottom flange extending outwardly from and coplanar with the base panel;
- and
- an inner part slidably insertable into the erected outer part and formed of a plurality of sheets of planar material, said sheets comprising a plurality of panels formed by joining a transversely central portion of said sheets with adhesive and folding opposing portions of one sheet downwardly along longitudinal parallel fold lines adjacent said joined portion.
A method for fabricating a collapsible longitudinal form void from corrugated paper with corrugation ribs lying in a first direction, comprising:
- preparing an outer part comprising a first rectangular sheet of corrugated paper having first and second sides perpendicular to the first direction and centrally folded perpendicular to the first direction and being joined by adhesive along a thin strip at the first and second sides of said first sheet;
- forming fold lines parallel to said central fold in said first sheet to define an upper panel, opposing side panels on each side of said upper panel, and a base panel joining said side panels;
- preparing an inner part comprising:
- forming a top panel comprising a second rectangular sheet generally coextensive with said upper panel;
- forming fold lines in a third rectangular sheet, having first and second parallel sides, to define a middle panel, a first strut panel adjacent whereby said first sheet is erected to a hollow form having a rectangular parallelogram cross-section with said bottom flange extending outwardly from and coplanar with the base panel, and
- an inner part slidably insertable into the erected outer part and having,
- at least one sheet of material having a planar transversely central portion and opposing angularly folded lateral strut panel portions defined by parallel fold lines on either side of the central portion.
Dependencies are inferred from the claim text.