Plastic article or earthenware shaping or treating: apparatus – Female mold – pallet handling means and means to charge...
Patent
1987-02-06
1990-03-13
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Female mold, pallet handling means and means to charge...
83326, 198836, 425255, 425315, 425373, 425453, B28B 502
Patent
active
049082175
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to apparatus for making tiles of slabs from castable material particularly concrete.
We have previously proposed such apparatus in relation to making tiles or slabs ranging from roofing tiles to paving slabs, and generally of a type, see our Pat. No. 1302188, where a sequence of platens on an endless conveyor can afford a substantially continuous surface onto which are laid plates and from which dividers are extensible between those plates to sever at least partially a layer of castable (concrete) material charged and compacted onto the plates. Such charging was basically by gravity from a hopper and initial spreading and compaction by associated roller means. Provision was also made for a further charge of finishing material from another hopper and associated spreader roller means with a further compaction stage prior to a drilling stage with positionally adjustable drills necessary for roofing tiles, and a take-off stage for the plates complete with cast and at least partially severed tiles or slabs. That apparatus has proved to be successful over the past fifteen years or so, as have its roofing tile products now well-known by the trade mark HARDROW.
However, that apparatus has certain disadvantages, one of which concerns production of tiles or slabs of different size due to association of the dividers only with leading or trailing edges of the platens, so that platen length has effectively divided one dimension of the tiles or slabs produced, each such divider being raised in turn on a cam track after first compression of the charged and compacted castable material.
The result has been that certain smaller sizes of tiles or slabs have had to be cut down from normal sizes, which involves waste of material.
SUMMARY OF THE INVENTION
According to one aspect of the invention, provision is made for dividers that at least partially sever the charged layer or substrate of suitable material to be operative selectively so as to give a further choice of sizes of tiles or slabs.
That may be achieved particularly advantageously by having more than one divider associated or associatable with each of the platens, whether simply on the basis of at least some dividers being readily removable and replaceable or on the basis of their selective control in sets.
Preferred embodiments hereof specifically involve providing each platen with a medially disposed additional divider, in particular preferred embodiments actually at positions dividing the lengths of two consecutive platens in the ratios 2:1 and 1:2 respectively. Then, if the additional dividers are operable as an alternative to the platen-edge-associated divider between such two consecutive platens, three smaller but equal length tile or slab sizes will be available instead of two larger but equal length sizes. Doing so by selective installation/removal of dividers is of selfevident flexibility of application. An alternative would be to have two cam tracks each selectively put into its operative configuration and each associated with a different set of dividers, which set may, of course, overlap. These proposals are plainly capable of modification or extension to more medical dividers or producing a mix of tile or slab sizes. Moreover, the same effect is attainable by using smaller platens or a mix of sizes of platens all with edge associated dividers but selectively operable in sets.
The advantages in terms of flexibility of tile or slab size and avoidance of waste will be manifest, perhaps particularly from the expanded possibility arising of making a mix of tile sizes in the same production run.
Another aspect of the invention concerns a drilling stage for the cast, compacted, and at least partially severed, tiles or slabs, which drilling stage comprises an array of selectively operable drill heads disposed in positions corresponding to each possible position for holes required by a range of sizes of tile or slab to be produced, and means responsive to specification of a particular said size in order to sele
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Chiesa Richard L.
Robert Abraham Limited
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