B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
400/1711, 72/92
B28B 7/16 (2006.01) B28B 7/34 (2006.01)
Patent
CA 1051174
ABSTRACT OF THE DISCLOSURE This is a device for forming vents or bores in con- crete floors. A cylindrical base portion is secured to the surface upon which the concrete is to be poured and a rigid foam cylindrical portion is pushed downwardly into the base whereupon an upper cylindrical guard portion may be pushed over the upper end of the cylindrical core. Both the base and the-guard portion are provided with inwardly projecting lugs which hold the cylindrical core into the base and hold the guard portion of the upper end of the cylindrical core. An ignitor cord harness extends around the cylindrical core which, when ignited, melts this core. The concrete floor is poured with the guard portion projecting above the floor level and after the concrete has set, the ignitor harness can be ignited thus melting and charring the core thus leaving a smooth cylindrical bore through the concrete floor.
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