Plastic article or earthenware shaping or treating: apparatus – Dynamic support or dynamic carrier and female mold
Patent
1989-01-13
1990-05-15
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Dynamic support or dynamic carrier and female mold
1984761, 425253, 425308, 425452, B28B 502
Patent
active
049253832
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL AREA
The present invention relates to a machine for manufacturing of flat concrete products upon separate moulding trays, at which the moulding trays by help of an endless conveyor are moved in closed succesion below and passing a concrete feeding station, where a concrete mass in a continuous layer is deposited, compacted and shaped on the passing moulding trays. The moulding trays further pass a severing device for severing the concrete layer between the separate moulding trays, before they, and the belonging shaped and product-forming concrete mass positions, are removed from the machine. The conveyor comprises a plurality of interconnected, and for carrying the moulding trays in a pre-determined position, adapted bed plates, which at least at the passing the concrete feeding station are moved over a supporting bed. The bed plates are arranged between a pair of endless, parallel and in syncrony operated conveyor chains, which are passing a front pair of chain wheels at the entrance portion of the machine and rear pair of chain wheels at the outlet-portion, whereby each bed plate is connected to the two conveyor chains by help of a pair of co-axial pivots in order to be individually moved ahead over the supporting bed.
The invention is not restricted to a special form of the bed plates and not even to conveyor chains in a narrow meaning provided with pivots for mounting of the bed plates, but can be related to different forms of the bed plates; e.g. wires or belts instead of conveyor chains and other mounting devices instead of pivots.
BACKGROUND OF THE INVENTION
The most common example of a flat concrete product, which is supposed to be manufactured in the machine in accordance with the invention, is a roof tile, whose top side as a rule shows linear generatrixes in its length direction, while its cross-section shows a wave-formed profile. Most frequently the roof tiles occurs as single- or double-cupped roof tiles, but a great number of variants will occur. The under side of the roof tile always is provided with knobs for mounting of the roof tile. The thickness of the roof tile can vary depending on its strength resistance, density and e.g. eventual suspension means. The manufacturing of concrete roof tiles are almost exclusively made by so called extrudation. This means that the concrete mass is compacted in a device including a rotary roller followed by a so called compacting block, which contacts the concrete, which is applied to the top side of the moulding trays in the machine. The demand for compacting of the concrete mass is considerable. In most countries standard demands of around 150-250 kg linear load on each cured roof tile occur together with a demand of a complete watertightness. The average thickness of the roof tile varies from 10 mm to around the dubble thickness at the knobs for the mounting of roof tile. This results in a considerable compacting force on the moulding tray when passing below the compacting unit.
An example of a machine in accordance with the preamble above is described in the Swedish patent publication SE 427 815. The machine in accordance with this patent publication is based upon two parallel chains which continuously pull the bed plates through the machine below a compacting unit, which consists of a rotating roller, and which is followed by a compacting block. The chains are standard roller chains, which have been provided with special links by which the bed plates are mounted to the chains. A special link and a number of standard links thereby show the same length as a roof tile. Each moulding tray is carried by two bed plates, at which the front bed plate is linked connected to the chains and at which the two other bed plates are linked connected to the first bed plate to make it for the bed plates to follow the chain around the chain wheel which are arranged at the two ends of the machine.
The Swedish patent publication SE 337 339 shows a similar machine for continuous manufacturing of roof tiles. The bed plates are, in accordance with this paten
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patent: 3257701 (1966-06-01), Lang
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patent: 3465395 (1969-09-01), Cushwa
patent: 3631574 (1972-01-01), Chapman
patent: 3701406 (1972-10-01), Aasted
patent: 4758148 (1988-07-01), Jidell
ABECE AB
Chiesa Richard L.
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