Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Making hole or aperture in article
Patent
1990-05-31
1992-01-07
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Making hole or aperture in article
264157, 264163, 264296, 2642979, 264333, 264336, B28B 148, B28B 710, B28B 714, B28B 1112
Patent
active
050789406
ABSTRACT:
Concrete blocks are formed in a mold having a cavity into which block-forming material is placed. A portion of the material is retained in place relative to the cavity walls when the block is removed from the cavity, and the face of the block forming material adjacent a surface of the material retained in place is provided with a split-type appearance to its surface. A block having a rough surface closely resembling a split surface can thus be attained without the expense and time involved in conventional block splitting. The assembly can be constructed to form blocks having non-planar split-type surfaces. Additionally, split-type surfaces can be formed on an interior surface of a composite block module adapted for splitting along a splitting plane, to attain a block providing a split-type appearance along two spaced planes.
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Aftergut Karen A.
Silbaugh Jan H.
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