Plastic article or earthenware shaping or treating: apparatus – With separate apparatus cleaning means – Coacting with forming means or dough divider type trap chamber
Patent
1990-03-20
1992-04-28
Housel, James C.
Plastic article or earthenware shaping or treating: apparatus
With separate apparatus cleaning means
Coacting with forming means or dough divider type trap chamber
249 64, 249141, 249145, 249151, 249176, 249178, 249184, 425414, 425438, 425812, B28B 730
Patent
active
051082829
ABSTRACT:
A CM block machine for casting masonry blocks includes a mold cavity formed between a mold box and a mold core containing one or more plungers selectively extending laterally into the cavity along a second axis which is normal to the axis of casting so as to form openings extending through portions of the block in the direction of the second axis. The plunger(s) is disposed in a cartridge housing contained within the mold core. An oversized vibrating ring wiper mounted in the cartridge housing engages the external periphery of the plunger to prevent CM material from entering the cartridge during plunger retraction. The plunger includes an annular relief chamber formed in a side wall thereof to provide an additional volume of air from within the cartridge to an air passage communicating with the plunger end face to prevent vacuum from impeding plunger retraction. A circular air filter is disposed in the annular chamber to prevent dirt and CM material from entering the cartridge interior through the air passage and annular chamber. The plunger width is preferably less than its length to ensure the CM material poured into the mold cavity occupies portions of the cavity located beneath the plunger. A hollow core bar supporting the mold core within the mold box protectively houses air tubings extending to the mold core to supply compressed air for selective plunger movement.
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Housel James C.
National Concrete Masonry Association
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