Stone working – Sawing – Endless
Patent
1996-05-24
1998-02-17
Morgan, Eileen
Stone working
Sawing
Endless
451296, 451298, 451309, B28D 108
Patent
active
057182167
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a cutting wire used as a tool for a wire sawing machine employed to cut metallic and especially mineral materials, such as concrete, natural stone and the like by means of a steel rope consisting of several wire strands. On said steel rope, cutting beads containing preferably metal-bonded superabrasives are spaced at predetermined intervals, and the wire ends of one or more wire lengths are connected by means of a connection mechanism.
At least one connecting mechanism is necessary if the cutting wire is to be employed on a wire sawing machine, especially when a closed wire loop is used. It is possible to connect several wire lengths to form a closed wire loop, which means that several connecting mechanisms can be present in one tool, for instance when a wire breaks and is reconnected.
According to the present state of the art, there are different methods of connecting the ends of wire saws:
A method of connecting wire ends known in the prior art is splicing. This method of connecting the wire ends of a cutting wire fitted with diamond cutting beads is disclosed in EP 160625A2. The splicing together of wire ropes cannot be regarded as a method for connecting cutting wire ends that can be accomplished sufficiently easily, securely or precisely. For this reason, this method is mainly used on stationary facilities.
Spliced cutting wires cannot be used for producing internal contours. Normally, the repair of spliced cutting wires cannot be carried out on site; instead, the wire has to be sent to the manufacturer's plant and must be repaired there.
U.S. Pat. No. 3,100,323 discloses a cable coupler with the cable ends being equipped with ferrules which are received in a connecting sleeve via a lateral opening. Thus, a connection is created which can be uncoupled easily. Since this patent describes round ferrules in a round seat of the connecting sleeve, this design is hardly suitable for cutting wires used in wire sawing machines, since torque cannot be transmitted along the longitudinal axis of the wire.
A wire saw coupling of a similar functional design is disclosed in U.S. Pat. No. 2,036,172 and CH patent No. 15168. Neither of the inventions allow the transmission of torque along the wire axis.
CH Patent No. 85444 discloses a connection for transmission belts which provides a connection of the two wire ends by means of the lateral introduction of a ball head into the seat of the connection sleeve. Here, the possibility of transmitting torque along the axis of the wire is ensured by means of a web between the ball head and the end of the wire along the neck. Still, this solution is not suitable for applications using cutting wires, since the bending moments which occur when the cutting wire connector passes through the rolls or pulleys of the wire sawing machine may gradually open up the corresponding seat of the second wire end, and the ball head may be pulled out.
European Patent No. 3,179,65A2 discloses a screw connection for connecting wire ends. The last cutting bead on each wire end is equipped with a threaded projection in which the wire ends are anchored. A threaded sleeve is screwed on to both threaded projections.
Great Britain Patent No. 884,473 also discloses a screw connection.
European Patent No. 4,142,80A2 discloses a screw connection for cutting wires, whereby careful selection of the thread lengths allows advantageous connecting and separating of the two wire ends. Additionally, a method for preventing the wire from becoming twisted in the head area of the two wire ends is provided. This is accomplished by means of a transverse rib engaging a slot. In addition to providing protection against wire twisting, this transverse rib would be suitable to ensure the transmission of torque as required by the state of the art described in the documents above.
A common disadvantage of cutting wire connectors based on clamping sleeves or threaded sleeves is their rigidity regarding bending, which leads to concave abrasive wear of the sleeves. This causes a reduced diameter in the m
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Copy of International Preliminary Examination Report for PCT/IB94/00245 dated May. 5, 1995.
Copy of International Search Report for PCT/IB94/00245 dated Nov. 3, 1994.
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