Static molds – Container-type molding device – Plural article forming mold – or molds with community feature
Patent
1996-07-01
1997-11-11
Woo, Jay H.
Static molds
Container-type molding device
Plural article forming mold, or molds with community feature
249119, 249135, 425253, B28B 724
Patent
active
056860099
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to molds for producing concrete items.
2. Description of the Prior Art
Molds for the production of relatively simple concrete items such as pavement stones, which are produced in large number, are usually used in automatic or semi-automatic casting machinery. Normally molds of this type are adapted to simultaneous production of a large number of pavement stones, for instance a whole pallet layer of pavement stones, which possibly also may be intended for machine laying.
Molds of this type are rather expensive to produce, and their life is relative short because of rapid wear. The mold frame which is provided with mold cavities corresponding to the outer shape of the concrete item, may be produced in several manners, namely either by flame cutting of the individual mold cavity in a solid steel plate with a thickness equal to the thickness or height of the concrete items or by molding in a suitable mold material, also with a thickness of the mold equal to the thickness or height of the concrete items. Furthermore it is known to produce the mold frame by welding.
In producing the concrete molds of this type the time factor is of great importance because there is a relatively long time of delivery of new molds, which is due to the fact that several working processes often are involved. The actual manufacturing of molds often demands expert work, for instance for the subsequent treatment such as hardening of molds, etc. Therefore damage to the mold may cause large working deficits because of the long time of delivery for replacement molds. Furthermore it is a problem to obtain sufficient dimensional accuracy. DE-A1-29 34 838 discloses a mold frame with a number of mold boxes, produced from cast iron by a casting that is screwed to the mold frame.
SUMMARY OF THE INVENTION
The purpose of the invention is to provide a mold for casting concrete items which by simple provisions results in a considerable reduction in the time of production and a considerable reduction in the price of the molds.
A mold according to the invention has mold cavities having individual mold boxes which preferably are made from thin metal plate, and which preferably are positioned with a mutual and uniform distance in a mold frame and secured to the mold frame by means of a molding material cast thereto for forming the mold. By means of simple provisions a considerable reduction in the production time and a considerable reduction in the price of the molds is obtained. Furthermore, the total weight of the mold is considerably reduced, which results in energy efficiency in connection with vibration of the mold by the casting operation. The individual mold boxes, which may be produced in an effective and inexpensive manner, may be stocked in large number, so that the time of delivery in connection with the mold production is reduced considerably, as mold boxes of a desired shape may be quickly placed and secured by casting in a standard mold frame.
In order to make the mold lighter and quieter in accordance with the invention the mold boxes are secured by casting in the mold frame by means of a molding material consisting of or containing an elastic material so that the mold boxes are mutually movable.
Preferably the mold boxes are secured by casting in the mold frame by means of a molding material consisting of or containing rubber, so that the mold boxes are mutually movable.
To make a vibration casting method more effective, the mold according to the invention may advantageously be provided with the mold boxes secured by casting to the mold frame in such a manner, that the mold boxes and the molding material project downwardly outside the mold frame so that mold boxes or mold cavities individually touch the vibration table or supporting plate and at the same time the surrounding casting material has a sound-absorbing effect.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described herewith in more detail with reference to preferred embodiments wit
REFERENCES:
patent: 848955 (1907-04-01), Bartlett
patent: 4050188 (1977-09-01), Van Wingerden
patent: 4343453 (1982-08-01), Rodon
patent: 4389036 (1983-06-01), Abou-Ezzeddine
patent: 4442995 (1984-04-01), Grady, II
Hopkins Robert
Maskin Industri Viborg A/S
Woo Jay H.
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