Static molds – Forming helical or threaded product
Patent
1977-01-21
1978-04-18
Husar, Francis S.
Static molds
Forming helical or threaded product
52125, 52701, 52705, 249 91, 249177, 249183, 249186, B28B 730
Patent
active
040847802
ABSTRACT:
A plug assembly, for temporary use with a concrete product insert having a coil defining an interior threaded surface, holds the insert in position adjacent a mold wall and prevents the interior of the coil from being filled with concrete. The plug assembly includes a plug having a hollow cylindrical elastomeric body defining a cavity which is open at one end of the body and a stem in the cavity attached to the body internally and extending out of the cavity a distance sufficient to provide for use of the stem as a handle. The outer surface of the cylindrical, elastomeric body is proportioned and threaded for firm matching engagement with the threaded coil interior surface upon predetermined radial compression and axial expansion of the body from its substantially unstressed condition. A support means has a first portion for insertion into the cavity in the elastomeric body and a second portion for attachment to a mold wall. The support means may be removed from the cavity as the mold wall is removed from the concrete product, and the plug may thereafter be removed from the coil by applying a pulling force to the stem. By use of a cavity closure means, such as a disc having a central opening for surrounding the stem, the plug may be used without the support means in a concrete product insert of the type which is positionable with the coil held vertically in the mold. The disc has a central opening for surrounding the stem and the diameter of the central opening is less than the unstressed diameter of the stem such that the disc will be held firmly by the plug.
REFERENCES:
patent: 2880608 (1959-04-01), Boll et al.
patent: 3216171 (1965-11-01), Jenkins
patent: 3590538 (1971-07-01), Holt
patent: 3742661 (1973-07-01), Tye
patent: 3889916 (1975-06-01), Ilukowicz
Husar Francis S.
McQuade John
The Dayton Sure-Grip & Shore Company
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