Plastic article or earthenware shaping or treating: apparatus – Projection
Patent
1974-10-21
1976-06-01
Baldwin, Robert D.
Plastic article or earthenware shaping or treating: apparatus
Projection
61 722, 425 59, 425 63, E03F 306
Patent
active
039599779
ABSTRACT:
Apparatus for slip-forming a pipe or drainage trench including a leading cutter which is attached to the front of a prime mover for digging a trench. A following cutter is also attached to the front of the prime mover, but behind the leading cutter to thereby level off the surface of the ground along the top of the trench. A rigid concrete shaping apparatus including a portion overlying the trench also includes a rigid tubular portion which is disposed within the trench. A roll of flexible plastic material is connected to the apparatus and this plastic material is sealingly connected at one end thereof to a source of air pressure which causes the plastic to inflate to a tubular shape. This plastic is thereby maintained in an inflated condition and extends along the length of the trench to a point inside of the tubular portion of the concrete shaping apparatus, at which point the plastic is pinched by rollers to thereby maintain the pressure within the inflated portion of the flexible tube. One end of the rolled portion of the roll of plastic extends down through one end of the tubular portion of the concrete shaping apparatus, through the rollers and out through the other end of the tubular portion of the shaping apparatus to connect to the source of air pressure. The prime mover moves slowly ahead as concrete is continually supplied to a hopper on the concrete shaping apparatus, which apparatus fills the trench with concrete in a plastic state and forms a concrete structure with an open tubular center. The plastic material unrolls and inflates inside of the hollow concrete structure formed to thereby prevent the concrete on the top of the hollow open tubular center from collapsing. Once the concrete has cured and hardened, the pressure in the plastic tube can be relieved and the tube removed. The formed pipe or drainage structure is then complete.
REFERENCES:
patent: 857588 (1907-06-01), Boyle
patent: 1362952 (1920-12-01), McQueary
patent: 2093766 (1937-09-01), Rich
patent: 2692092 (1954-10-01), Kinsinger
patent: 2969576 (1961-01-01), Fuller
patent: 3193901 (1965-07-01), Lee et al.
patent: 3646767 (1972-03-01), Shelley
patent: 3684030 (1972-08-01), Lucero
patent: 3773874 (1973-11-01), Long
Baldwin Robert D.
McQuade John
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