US 5,040,968 AGranted

Device for manufacturing concrete parts

AssigneeGeorg Prinzing GmbH & Co. KG

InventorRichard Kraiss

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Abstract

A device for manufacturing concrete parts, particularly concrete pipes, and based on the principle of sinking mold whereby a molding bottom ring together with a jacket are continuously lowered relative to a stationary mold core while concrete mixture is poured from above and distributed into the emerging molding space by a radial pressing device mounted on the top end of the mold core. Simultaneously with the lowering of the mold jacket and the molding bottom ring a supply device for delivering the concrete material is also lowered such as to keep a constant distance from the open top end of the mold jacekt. The radial pressing device is designed to compact the incoming concrete material in radial direction without imparting any torque thereto. In this manner any stress in the finished part, particularly between the concrete and reinforcing wire mesh is effectively avoided.

Claims27

Dependent claims

A device for manufacturing concrete parts in a mold comprising an upright vibrator for producing rotary vibrations;

said vibrator being secured at one end thereof to a stationary support;
a tubular mold core releasably mounted on said vibrator, said mold core defining a longitudinal center axis which coincides with a center axis of said vibrator and having a top end face which extends in a radial plane intersecting at right angles said longitudinal center axis;
a mold jacket movable in two opposite vertical directions relative to said mold core to define a variable molding space therewith;
an eccentric supported on said top end face of the mold core and projecting into said radial plane;
said eccentric defining a center axis which is offset relative to said longitudinal center axis of the mold core;
a driving motor having a drive shaft for rotating said eccentric;
a ring-shaped pressing head supported for rotation about said eccentric and being driven by said eccentric such as to perform an oscillatory rotary movement within said radial plane and to exert a radial pressure on concrete material in the molding space;
said pressing head having a top surface provided with a distributing device for directing the concrete material into the molding space;
and said rotary vibrations of the vibrator being opposite to the direction of rotation of said pressing head.

6 more elements

Dependencies are inferred from the claim text.