Plastic article or earthenware shaping or treating: apparatus – Building forms or construction engineering type mold with... – Including mold charging means
Patent
1975-04-30
1977-05-10
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
Building forms or construction engineering type mold with...
Including mold charging means
425207, 425209, 425219, 425432, B28B 1302
Patent
active
040225569
ABSTRACT:
A machine is provided for forming hollow cored concrete slabs in which the hollow core may be produced with shapes other than circular in cross section. The machine may produce a noncircular cross sectioned core by utilizing a novel auger assembly construction which employs an open spiral auger, in the form of a corkscrew, which is supported by an initial core forming member which constitutes a surface of revolution and which conforms substantially to the internal surface of the spiral auger member so as to permit the auger to move over the surface thereof and thus continuously wipe clean the surface and prevent any build up on the initial core forming member. The rotating auger is utilized to compress and form concrete material firstly over the initial core forming member and secondly over the final trowel member, in a manner such that the final slab product will have a core with a cross sectional shape approximating that of the final trowel member. Such cross sectional core shape may be of almost of any desired configuration, and the present invention further contemplates the use of interchangeable final trowel members.
REFERENCES:
patent: 2406025 (1946-08-01), Moor
patent: 3143782 (1964-08-01), Kalns
patent: 3159897 (1964-12-01), Ellis et al.
patent: 3284867 (1966-11-01), Booth
patent: 3781154 (1973-12-01), Herbert et al.
patent: 3877860 (1975-04-01), Putti
The Declarations of Carter and Putti, respectively; The Decision of the Supreme Court of British Columbia, 10/5/1973, Docket No. 20965/73; Canadian Patent Application S.N. 85194 filed on 6/11/1970; all of which can be found in the patent file of U.S. Pat. No. 3,877,860 issued to George Putti on 4/15/1975.
Husar Francis S.
McQuade John
The George Hyman Construction Company
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