VIBRATION DAMPING SHEET FOR CUTTING DISKS

Abstract: The invention is in the field of cutting disks employed in the construction industry for cutting concrete and construction materials in general and in industrial applications for cutting wood, glass and metals. More specifically the invention relates to a sheet (1) able to be attached to the cutting disk. The sheet comprises one or more layers (3) of synthetic fabric such as carbon fibre, glass fibre, or combinations of carbon fibre with glass fibre. The sheet comprises a layer of adhesive (4) able to adhere to the surface of the cutting disk.

Description: Vibration damping sheet for cutting disks The present invention relates to a vibration damping sheet in particular for cutting disks. Diamond disks are known, comprising a steel or aluminium disks on whose peripheral area is secured, by means of known welding technique, a crown of diamond covered plates. Said disks are made to rotate at a high number of rotations per minute and are used to cut the most disparate products such as rocks, concrete, tiles made of any material and construction materials in general. Also known are steel disks for cutting wood, glass, iron, which present a peripheral crown of teeth conformed as a saw or with plates of hard metal, such as vidia, secured thereon. It has been noted that traditional steel or aluminium cutting disks, be they intended for construction materials or for iron, wood, etc., develop magnetic and sound waves which cause vibrations. The vibrations, in addition to creating a deafening noise, considerably influence the operating temperature of the disk and thus greatly reduce its mechanical resistance. Said disks are subject to different kinds of deformations which lead to the breakage or detachment of the diamond plates or of the teeth with the consequent considerable risk for the operator and for the treated product. The aim of the present invention is to eliminate or rather stop the formation of said waves and thereby prevent the known disk made of steel or metal from experiencing overheating phenomena. Another aim is to improve, in the case of diamond disks, the work of the diamond both from the standpoint of the cut and of execution times. This and other aims are all attained by the vibration damping sheet that is characterised as stated in the claims below and in particular in that it comprises one or more layers of fabric made of carbon fibre or carbon fibre combined with other synthetic fibres such as glass or glass fibre alone, on at least one face of said sheet being applied a layer of adhesive suitable stably to secure said sheet to the steel or metal disk. This and other features will become more readily apparent from the description that follows of a preferred form of embodiment illustrated, purely by way of non limiting example, in the accompanying drawing plate, wherein: - Figure 1 shows the circular shaped sheet in a perspective view; - Figure 2 shows a cross section of the sheet. With reference to the figures, the number 1 indicates in its entirety a circular shaped sheet with a central hole 2. The sheet is formed by one or more layers 3 of carbon fibre fabric to form an overall thickness of 2 - 8 tenths of millimetre, in any case of such thickness as not to exceed the thickness of the diamond plate 10 or of the tooth of a metal disk 11 whereto said sheet shall be applied. Each layer of fabric can alternatively be realised with carbon fibre combined with glass fibre or with carbon fibre mixed with Kevlar fibre. Alternatively, each fabric layer can be entirely made of glass fibre. In the case of fabric with combined fibres, the carbon fibres can be oriented differently from the orientation of the glass or Kevlar fibres. On at least one of the two faces of the sheet, an adhesive layer 4 is applied, covered with a sheet 5 of paper or hardboard. Removing the hardboard 5, the sheet 1 can be attached to one of the faces of the steel disk thereby forming a single body therewith. Another sheet 1 must be applied to the other face of the disk. The thickness of the sheet 1 and the type of fibre employed for its realisation shall be determined according to the type of metal whereof the disk is made and also to its operative application. Since the diameters of cutting disks have been standardised, the sheet may have a diameter equal to the diameter of the disk inside the diamond plates or the teeth, but it may be realised as shown in Figure 1, with a diameter equal to the maximum diameter of the cutting disks with weakening and ripping lines 12 along circumferences corresponding to the other smaller commercially available diameters. This allows to market a single universal sheet to be adapted directly by the consumer upon applying the sheet to the disk. The one or more layers 3 of fabric may be impregnated with a two-component resin.

Claims: Claims 1. Vibration damping sheet for cutting disks made of metal, characterised in that it comprises one or more layers (3) of carbon fibre fabric, on a sheet of said sheet (1) being provided a layer of adhesive (4) able to adhere to the surface of a metal disk (11). 2. Sheet according to claim 1, characterised in that it comprises one or more layers (3) of fabric made of carbon fibre and glass fibre, the two types of fibres being oriented differently. 3. Sheet according to claim 1, characterised in that it comprises one or more layers (3) of fabric made of carbon fibre and Kevlar fibre, the two types of fibre being differently oriented. 4. Sheet according to claim 1, characterised in that it comprises one or more layers (3) of fabric made of glass fibre. 5. Sheet according to claim 1, characterised in that it comprises a sheet of paper or of hardboard (5) which covers the adhesive layer (4). 6. Sheet according to one or more of the previous claims, characterised in that it presents a thickness such that, once applied to the disk, it does not exceed the thickness of the tooth or of the diamond plate (10). 7. Sheet according to one or more of the previous claims, characterised in that it presents a circular shape with a diameter equalling that of the disk inside the diamond plates or the teeth. 8. Sheet according to one or more of the previous claims, characterised in that it presents a diameter equal to the maximum diameter of commercial cutting disks with weakening and ripping lines (12) along circumferences corresponding to the other smaller commercially available diameters.

Inventors: PARETI VITTORIO, PARETI, VITTORIO
Applicants: PARETI VITTORIO, PORFIDI INTERNATIONAL S R L, VISENTIN DANIELA, PARETI, VITTORIO, PORFIDI INTERNATIONAL S.R.L., VISENTIN, DANIELA
Application year: 1999
Main classification: B24D3
IPC codes: B23D47, B23D61, B24D3, B24D5