Abstract: The invention relates to a vibrator for acting on an object in a predetermined direction, comprising a casing and two identical, synchronously driven, electric linear motor coils arranged mirror-symmetrically therein, between which coils there is an armature which can be moved to and fro in an oscillatory fashion by driving the linear motor coils appropriately in their longitudinal direction, the armature being mounted via wires arranged under spring bias in the casing, and also to an apparatus for producing concrete blocks which uses vibrators of this type.

Abstract: The invention relates to a concrete-block-making machine having a part which is displaceable via a linear drive, the linear drive comprising a drive unit and a linear guide for guide rollers, the drive unit comprising at least one linear motor and the linear guide comprising at least one guide rod for the guide rollers, the at least one guide rod and the guide rollers movable relative thereto being hardened, and guide rollers and guide rod being arranged with slight play relative to one another.

Abstract: The invention relates to a method and an apparatus for producing concrete blocks, in which concrete mortar (14) is moved across a mould (7) by means of a filling carriage (4) and the mould (7) is filled with concrete mortar (14) from the filling carriage (4), whereupon the filling carriage (4) is returned and the concrete mortar (14) located in the mould (7) is compacted first of all by means of a plunger (13), movable from above in the direction of the mould (7), and then by vibration, the plunger (13) being moved via two synchronized motors (15) located one behind the other in the direction of travel of the filling carriage (4) and the torques exerted by said motors (15) being measured, the filling operation of the mould (7) being corrected in accordance with the deviation of actual values, derived from the difference in the measured torques, from predetermined desired values.

Abstract: The invention relates to a concrete-block-making machine having a part which is displaceable via a linear drive, the linear drive comprising a drive unit and a linear guide for guide rollers, the drive unit comprising at least one linear motor and the linear guide comprising at least one guide rod for the guide rollers, the at least one guide rod and the guide rollers movable relative thereto being hardened, and guide rollers and guide rod being arranged with slight play relative to one another.

Abstract: The invention relates to a vibrator for acting on an object in a predetermined direction, comprising a casing and two identical, synchronously driven, electric linear motor coils arranged mirror-symmetrically therein, between which coils there is an armature which can be moved to and fro in an oscillatory fashion by driving the linear motor coils appropriately in their longitudinal direction, the armature being mounted via wires arranged under spring bias in the casing, and also to an apparatus for producing concrete blocks which uses vibrators of this type.

Abstract: The invention relates to a method and an apparatus for producing multicoloured concrete blocks, in which coloured concrete mortar is poured from a silo into a receiving space of a filling carriage, the filling carriage is traversed across a moulding tool for the concrete blocks, and the moulding tool is filled with concrete mortar from the filling carriage, after which the filling carriage is returned and the concrete mortar located in the moulding tool is compacted, differently coloured concrete mortar being poured into at least one additional receiving space of the filling carriage and being introduced into the moulding tool via at least one distributing roller rotationally driven in accordance with a predetermined discharge.

Abstract: The invention relates to an apparatus for treating blocks, having a conveying arrangement for transporting the blocks one after the other along a treatment station in which there is arranged at least one tool holder which can be driven in circulation by means of a drive, has a longitudinal axis and on which there are fastened flexible, elongate treatment tools which have two ends and come into contact with predetermined regions of the blocks as the tool holder circulates. The flexible treatment tools are fastened in loop form, by way of the two ends, on the tool holder such that they are spaced apart from one another in the direction of the longitudinal axis of the latter, with the result that they sag when the tool holder is at a standstill.

Abstract: A vibrator includes a vibrating table; a plurality of driven unbalanced shafts disposed within the vibrating table and arranged in pairs; and a plurality of unbalanced bodies. A separate unbalanced body is connected to each unbalanced shaft. The unbalanced bodies can assume various vibrating frequencies and angular positions. An adjustment device varies the vibrating frequencies and angular positions of the unbalanced bodies relative to one another. Each shaft is driven by a separate motor; the motors are adapted to rotate in synchronism with one another at a predetermined rotational speed. The adjustment device includes an electronic controller for regulating each of the motors.