Stone working – Sawing
Reexamination Certificate
1999-10-06
2001-07-10
Morgan, Eileen P. (Department: 3723)
Stone working
Sawing
C125S021000
Reexamination Certificate
active
06257223
ABSTRACT:
The present invention relates to a diamond-set wire for cutting stony materials and the like, comprising a cable to which a series of abrasive units is connected, each abrasive unit including a cutting member which has at least one portion made of abrasive material disposed radially on the outside of the cable, the portions of the cutting members made of abrasive material being- spaced apart along the cable and each abrasive unit being anchored to the cable by means of a plastics or elastomeric filling material interposed between the unit and the cable.
Known diamond-set wires of the type indicated above are generally used for sawing blocks of stony material, particularly granite blocks. Each cutting member of these known wires constitutes an entire abrasive unit known as a “pearl” or “bead” and is spaced from the adjacent units. All of these units are then fixed to the cable by the co-moulding of a plastics or polymeric filling material thereon, in a manner such that some of the material penetrates between each unit and the cable thus anchoring the abrasive units to the cable. The co-moulded material thus also performs the function of a spacer element between successive abrasive units. However, this filling material tends to deteriorate quite quickly in the regions interposed between successive abrasive units because of the high thermal and mechanical stresses to which the wire is subject in use, so that the operation of this material as a spacer element is of fairly short duration, requiring frequent replacement of the wire in order for the cutting operation to continue, and consequently requiring repair of the damaged wire.
Diamond-set wires normally used for sawing marble blocks are also known, in which the various abrasive units are mounted on the cable so as to be rotatable relative thereto. In this case, an independent spacer spring is disposed between one abrasive unit and the next, and is normally pre-loaded with its respective ends in abutment against the two adjacent abrasive units with the interposition of coaxial spacer rings. However, this type of free mounting of the abrasive units is not considered very safe since, in the event of a breakage of the cable, the abrasive units and the spacer springs are thrown in random directions at high speed, resulting in serious danger to any operators in the vicinity.
The object of the present invention is to provide a diamond-set wire of the type indicated above which can be used for sawing stony materials of various kinds such as marble, granite or concrete, which is more reliable and safer than the wires used previously, and which has a longer useful life.
This object is achieved by virtue of the fact that adjacent abrasive units are arranged in contact with one another.
The wire thus has greater mechanical strength in the regions between successive abrasive portions so that the relative positions of the abrasive units are subject to less variation in use, advantageously reducing the frequency of wire-replacement and maintenance operations.
According to a preferred aspect of the invention, the diamond-set wire is also characterized in that the cutting members are supported by at least one support element surrounding at least part of an axial portion of the cable, this support element being incorporated in the filling material.
By virtue of this characteristic, the diamond-set wire retains good flexibility, mechanical strength and resistance to heat, and is inexpensive to produce. In particular, the portion of each abrasive unit which acts as a spacer relative to the adjacent unit and/or relative to the cable adopts the general structure of a body made of composite material in which the support element constitutes the reinforcing portion, incorporated in a matrix of plastics or elastomeric filling material.
A further subject of the invention is a method of producing a diamond-set wire for cutting stony materials or the like, characterized in that it comprises the steps of:
providing a cable,
providing a plurality of abrasive units each of which includes a cutting member which has at least one portion made of abrasive material,
associating the abrasive units in contact with one another to the cable, in a manner such that their portions made of abrasive material are arranged radially on the outside of the cable and spaced apart,
anchoring the abrasive units to the cable by applying a plastics or elastomeric filling material in a manner such that the filling material is interposed between the cable and each abrasive unit.
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EPO International Search Report for Application No. PCT/EP98/00710.
Dulford Properties Limited
Merchant & Gould P.C.
Morgan Eileen P.
Shakeri Hadi
LandOfFree
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