Stone working – Sawing – Endless
Patent
1995-12-12
1997-07-08
Rose, Robert A.
Stone working
Sawing
Endless
451439, 451296, 125 12, 125 1601, 125 1602, A21B 100
Patent
active
056450400
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a rope sawing machine and a method of rope swing.
BACKGROUND
Rope sawing machines are already known with which the sawing rope is slung in the form of an endless loop around a concrete body or the like that must be cut. As the depth of the cut increases, to maintain the cutting pressure of the rope, the sawing rope loop must be continuously lightened. To this end the rope driving device is positioned on a carriage or traveller that can be moved along horizontal rails. When large bodies must be cut, long rope loops, a long travelling path and correspondingly long rails are required. In many cases, however, a limited availability of space prevents the installation of long rails, which limits the use of such rope sawing machines.
THE INVENTION
It is an object of the invention to create a rope sawing machine of an as compact and simple as possible construction, which can also be used when the available space is limited, and to provide a rope sawing method suitable to be employed even in a small space.
Briefly, a rope storage is provided in form of a pulley-block to store the free rope loop in particular space-saving manner.
A prefered form can be realised by deflecting pulleys which are inclined for deflecting the saving rope into different rope running planes. Therefore different rope line numbers of the pulley-block increases the rope storage capacity.
The use of two parallel controllable hydraulic motors for the sawing rope drive permits a slow starting up when the sawing rope movements begins. As a result thereof the tensile forces acting on the sawing rope can be properly controlled and breaking of the rope due to excessive stress, especially when the rope starts to move, can be avoided.
To permit an adaptation to the progressing cutting operation, the rope loop that becomes free can be hung by hand around various rope deflecting pulleys and selectively in different rope line numbers, which permits a particularly compact construction of the rope sawing machine.
DRAWINGS
An exemplified embodiment of the subject of the invention is illustrated in the drawing and will be explained in greater detail in the following.
FIG. 1 shows a side view of a rope sawing machine together with a concrete body that must be cut.
FIG. 2 is a top view onto the rope sawing machine with the body that must be cut.
FIG. 3 is a top view onto the top pulley carrier, without sawing rope.
FIG. 4 is a front view of the rope sawing machine with a first type of rope guidance.
FIG. 5 is a front view of the rope sawing machine with a second type of rope guidance.
FIG. 6 is a front view of the rope sawing machine with a third type of rope guidance.
DETAILED DESCRIPTION
The rope sawing machine is used to saw a concrete body, wall, rock or the like by means of a sawing rope 1, which normally is covered with diamond splinters or other suitable abrasive substances. To this end the sawing rope 1, which forms an endless loop, is slung around the body 2 that must be cut and guided over deflecting pulleys to a rope sawing machine 3. The rope sawing machine 3 has a frame 4 on which a top stationary pulley carrier 5 and a bottom moveable pulley carrier 6 are positioned. The drive of the sawing rope 1 takes place by two hydraulic motors 7, 8 positioned on the run-in and run-out side.
To tighten the sawing rope 1 in order to produce the cutting tension, a chain drive 9 acting on the bottom moveable pulley carrier 6 is provided, which is driven by a hydraulic motor 10 separate from the rope drive.
A first rope deflecting pulley 12 on the top pulley carrier 5 is connected to the hydraulic motor 7 on the drive side, and a second rope deflecting pulley 13 positioned on the top pulley carrier 5 is connected on the opposite side to the second hydraulic motor 8 on the drive side.
On a carrier 11 fastened in a detachable manner to the base of the frame 4, on the left and the right one further deflecting pulley 14, 16 each is provided, each fastened to a rotatable plate 17. These two bottom deflecting
REFERENCES:
patent: 4494523 (1985-01-01), Wells
patent: 4633848 (1987-01-01), Bresciani
patent: 4787363 (1988-11-01), Kubo
patent: 4893607 (1990-01-01), Kubo
patent: 5060628 (1991-10-01), Ishida
Hydrostress AG
Nguyen George
Rose Robert A.
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