The present invention belongs to the field of polishing machines or devices and, more specifically to the polishing of stone which uses abrasive materials for this.
The main object of the present invention is a multilayer part for the polishing of any type of stone, whether natural or artificial, earthenware, porcelain stoneware and for all type of floorings and coverings, which considerably optimizes both the quality and the cost of the polishing.
There are currently different machines on the market that enable the polishing of slabs of stone or other similar materials, and which generally have a work table whereon the slabs of stone to polish are placed, and a head for carrying the disc or rotating tool for the abrasion or cutting of the upper surface of the slab. Said heads are commonly mounted on moving supports disposed above a conveyer belt or above a transport surface designed to displace the slabs to polish in a substantially horizontal direction.
In these machines it is typical that the operator places the slab to polish on the work table so that the head disposed in an upper plane may act on the upper surface of the element to polish.
These rotating discs have polishing parts that are radially equidistributed and composed of different layers which, on the lower part, contain an abrasive material designed to come into contact with the surface to polish.
The technical problem posed is that the manufacturing of these polishing parts is performed by joining and sticking one by one their different layers of composition, which gives a worse polishing quality that often causes the breaking and chipping of the stone to polish, with the consequent economic cost, both in time and material and in labour.
Additionally, the patent document
The base, the intermediate part, the insert and the polishing pad are attached to each other and to the head of the polishing machine by means of holes and screws, which are time-consuming connections, as well as are subjected to tolerances and therefore, noise, vibration and inaccuracy of operation, thereby leading to an early wearing of the abrasive material.
The present invention resolves the aforementioned technical problem by providing a multilayer part preferably of plastic material, and that may be of other materials (metal, wood, etc.), which enables the polishing of any type of stone material, whether natural stone or artificial stone, earthenware, porcelain stoneware and for all type of floorings and coverings, which considerably optimizes the quality of the polishing due to the flexibility of said multilayer part, whereby the material to polish neither breaks nor is chipped.
The multilayer part, object of the invention, designed to be joined in its upper part to a head radially disposed on the interior of a rotating disc, and on the lower part whereof is fitted a piece of abrasive material, preferably comprises three superimposed layers: an upper layer which has a trapezoidal protuberance in its central area for its dovetailing with the head, an intermediate layer disposed under the upper layer, adapted to provide flexibility to the part, preferably composed of an elastic material, and a lower layer located under the intermediate layer which has a trapezoidal recess, also adapted for its dovetailing with the aforementioned piece of abrasive material.
This multilayer part is manufactured by injection, extrusion or any automatic transformation process, thus avoiding having to stick each layer separately, with the consequent benefits this entails in terms of saving time and labour.
Preferably both the upper layer and the lower layer of the multilayer part are manufactured in hard and rigid plastic. In turn, the intermediate layer is preferably of gum, rubber, PVC or any other type of elastic material. This layer composition enables greater durability of the abrasive material, less pressure to be exerted by the heads and a greater adaptability to materials with reliefs, enamels, etc.
Therefore, the multilayer part for polishing object of the present invention optimizes the polishing process of all type of stone materials, achieving a considerable saving in the end polishing cost, due less consumption of abrasive material; less consumption of energy as a consequence of less pressure necessary on the heads, and a greater polishing quality. Said multilayer piece makes it possible to obtain more polishing metres per minute, due to the greater speed that can be achieved in the polishing machines as a consequence of a greater flexibility of said multilayer part, and whereby breakages or chippings caused in the pieces to polish are minimized.
To complement the description being made and in order to aid towards a better understanding of the characteristics of the invention, in accordance with a preferred example of practical embodiment thereof, a set of drawings is attached as an integral part of said description, wherein the following has been represented with illustrative and non-limitative character:
Said multilayer part (1) is formed by three superimposed layers (4, 6, 7) of plastic material: an upper layer (4) of rigid plastic which has a trapezoidal protuberance (5) in its central area for its dovetailing with the head (2), an intermediate layer (6) disposed under the upper layer (4) composed of an elastic material, and a lower layer (7) located under the intermediate layer (6) which has a trapezoidal recess (8), adapted for its dovetailing with the aforementioned piece of abrasive material (3).
Furthermore, both the upper layer (4) and the lower layer (7) of the multilayer part (1) are manufactured in hard and rigid plastic. Likewise, the intermediate layer (6) is of rubber, and can be of any other type of elastic material.
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