Resilient, destructable core means

Details Resilient, destructable core means Resilient, destructable core means

1975-11-14

1977-04-19

Husar, Francis S.

Static molds

Including destructible feature

Destructible by heat or fusion

249177, 249184, B28B 730, B28B 734

Patent

active

040184161

ABSTRACT:
This is a device for forming vents or bores in concrete walls or floors. Basically, it consists of a sleeve containing a semi-rigid thermoplastic material or the like and means incorporated therein which, when ignited, either melt or burn out the core. These are inserted within the forms or on the floor surface prior to the pouring of concrete or the like and may remain in place in the finished wall or floor until they are required. The core includes a pair of semi-rigid thermoplastic sections urged outwardly from one another by a spring so that they engage the wall forms. The preferred embodiment includes ratchetted wall form engaging strips secured between each end cap and a detachable tool for urging the strips outwardly thus forcing or jacking the end caps into engagement with the wall forms when the spring is not strong enough for this purpose.

REFERENCES:
patent: 1951953 (1934-03-01), Tollonitsch
patent: 2234784 (1941-03-01), Stolz
patent: 2589177 (1952-03-01), Wilhelm
patent: 2665109 (1954-01-01), Romby
patent: 2968855 (1961-01-01), Stolz

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