Destructible bore forming means

Details Destructible bore forming means Destructible bore forming means

1975-11-14

1977-05-31

Husar, Francis S.

Static molds

Including destructible feature

Destructible by heat or fusion

249177, 249184, B28B 734

Patent

active

040265110

ABSTRACT:
This is a device for forming vents or bores in concrete 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.

REFERENCES:
patent: 1482565 (1924-02-01), Johnson et al.
patent: 2589177 (1952-03-01), Wilhelm
patent: 2684518 (1954-07-01), Whitlock
patent: 3265349 (1966-08-01), Hamrick
patent: 3632724 (1972-01-01), Hilgeman, Jr.

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