Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Spacer-positioner; e.g. – rebar chair
Reexamination Certificate
2005-03-23
2008-12-02
Cranmer, Laurie K (Department: 3636)
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Spacer-positioner; e.g., rebar chair
C052S685000, C052S686000, C052S677000, C052S678000
Reexamination Certificate
active
07458192
ABSTRACT:
An improved chair for supporting intersecting wires forming a wire mesh at a pre-selected elevated position above a bearing surface during formation of a concrete slab is constructed having a base member shaped to rest on the bearing surface, a compressible support structure having a lower section affixed to the base member, a middle section and an upper section affixed to a setting shaped to support the wire mess at the elevated position. The chair is constructed having an improved compressible, generally bell-shape support structure having two pairs of opposing arched-shaped openings in the middle section forming two intersecting arches, each arch having a pair of opposing flexible legs that bow outward when a pre-determined load is applied to the upper section. The support structure further having a strengthening plate affixed on an interior surface of the upper section of the support structure formed by the intersecting arches, the chair being constructed from a blend of high density and low density crystalline polymer.
REFERENCES:
patent: 3368320 (1968-02-01), Lowery
patent: 3788025 (1974-01-01), Holmes
patent: 5107654 (1992-04-01), Leonardis
patent: 5729949 (1998-03-01), Hartzheim
patent: 6663316 (2003-12-01), Harris
Cranmer Laurie K
Roy Kiesel, et al
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