Patent Document

FIELD OF THE INVENTION 
     The present invention pertains to a saw cable guide with a stand and at least two rotatable cable guide rollers arranged pivotably thereon. 
     BACKGROUND OF THE INVENTION 
     A saw cable guide has been known from WO96/33058. It comprises a stand with a crossbeam, which is mounted on it vertically adjustably and rotatably and at one or both ends of which a transversely extending h-shaped hollow axle is arranged. Two freely rotatable cable guide rollers are pivotably mounted at the ends of the hollow axle. The cable guide rollers are flush with their pivot axes. The saw cable is guided directly between the two cable guide rollers and led through the hollow axle. Reliable guiding of the saw cable between the two cable guide rollers is not always guaranteed in this arrangement. In addition, the forces of the cable act on is the stand kinematically unfavorably at a spaced location and with a lever arm. Moreover, the kinematics of the saw cable guide is not optimal. 
     SUMMARY AND OBJECTS OF THE INVENTION 
     The object of the present invention is to provide a better saw cable guide. 
     According to the invention, a saw cable guide is provided with a stand and at least two rotatable cable guide rollers arranged pivotably thereon. The cable guide rollers are arranged with their pivot axes forming an angle. A saw cable is led around the stand. 
     The kinematics and the support of the saw cable forces are improved according to the present invention compared with the prior art. In addition, better guiding and angle deflection of the saw cable between the pivotable cable guide rollers is guaranteed. 
     It is particularly advantageous here for the saw cable to be additionally guided via a rotatable deflecting roller on the stand. This shortens the free cable lengths and reduces an undesired tendency of the saw cable to vibrate. In addition, the guide surface of this deflecting roller can impart a twist to the saw cable, as a result of which a more uniform circumferential wear of the saw cable is achieved. Moreover, a smoother run of the cable is achieved due to the twist. 
     The pivot axes may be arranged in the same plane and at an adjustable angle of preferably 90° in relation to one another. 
     The deflecting roller may have an elastic cable guide surface, preferably one consisting of rubber. This cable guide surface may have oblique profiling. The roller arrangement may be arranged vertically adjustably on a stand. The cable guide rollers may have hollow pivot housings for leading through the saw cable. These pivot housings may have a locking device. 
     The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     In the drawings: 
     FIG. 1 is a side view of the saw cable guide according to the invention; and 
     FIG. 2 is a top view of the arrangement of to FIG. 1 in the direction of arrow II of FIG.  1 . 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to the drawings in particular, the saw cable guide  1  shown in FIGS.  1  and  2  is used in conjunction with a cable saw (not shown), which is used to cut workpieces, e.g., block-shaped bodies consisting of concrete, brickwork or other materials. Such a cable saw has been known from, e.g., WO95/18692. 
     The saw cable guide  1  shown is used to deflect and guide the saw cable  19  at the workpiece (not shown). It is usually present for this purpose in duplicate and may be arranged and fastened at or in the vicinity of the workpiece in a suitable manner. 
     The saw cable guide  1  has a stand  2 , which may have any suitable design. In the embodiment shown, it has a foot plate  3  and a column  4  sticking out therefrom vertically. A plurality of leveling pins, with which the stand  2  can be aligned in the desired manner in relation to the workpiece and/or the foundation, may be present on the foot plate  3 . The fixing is performed by means of a dowel screw or in any other suitable manner. 
     The saw cable guide  1  also has two cable guide rollers  5 ,  9 , which are mounted on a respective pivot housing  7 ,  11  via an oblique extension arm  20  each. The cable guide rollers  5 ,  9  are mounted with their axes freely rotatably on their extension arms  20 , and the extension arms  20  are in turn mounted freely rotatably by 360° on the pivot housings  7 ,  11 . Via suitable bent brackets  6 , the pivot housings  7 ,  11  are detachably or rigidly fastened to a common sleeve  16 , which is guided slidingly vertically adjustably and lockably on the column  4 . As an alternative, the pivot housings  7 ,  11  may also be guided vertically adjustably independently from one another on sleeves or the like of their own. The sleeve  16  with the cable guide rollers  5 ,  9  can be fixed at the desired height by means of a locking means  17 . 
     The pivot housings  7 ,  11  permit the rotation of the cable guide rollers  5 ,  9  around one pivot axis  8 ,  12  each. These pivot axes  8 ,  12  are preferably arranged in a common plane and preferably in parallel to the foot plate  3 . Furthermore, they are arranged at a 90° angle in relation to one another. As is shown in FIG. 2, the saw cable is led around the column  4  of the stand  2 . 
     The brackets  6  are rigidly fastened to the sleeve  16  in the exemplary embodiment shown. As a result, the pivot axes  8 ,  12  form a fixed angle preferably equaling 90° with one another. As an alternative, the brackets  6  may also be mounted adjustably on the sleeve  16  with a suitable locking means, so that the pivot axes  8 ,  12  can also be set and fixed at another angle in relation to one another. 
     In the preferred embodiment, a deflecting roller  13  is mounted freely rotatably around the axis of the column on the stand  2  and especially on the column  4 . The deflecting roller  13  may also be arranged with its bearing  14  on the sleeve  16 . As an alternative, the deflecting roller  13  may be vertically adjustable and lockable in itself. It is preferably located with its cable guide surface  15  in the same plane as the pivot axes  8 ,  12 , so that the saw cable  19  runs between the cable guide rollers  5 ,  9  via the deflecting roller  13  in the same plane and is led around the stand  2  at the desired angle. 
     The cable guide surface  15  consists of an elastic material, preferably rubber, and imparts a forced twist to the saw cable  19  due to lateral contact. As is illustrated in FIG. 1, the cable guide surface  15  is provided for this purpose with an oblique profiling  21 , which is arranged, e.g., at the lower end of the guide surface. The forced twist reduces the circumferential wear of the saw cable  19  and makes it more uniform. In addition, the noise caused by the running of the cable is reduced. The cable guide surface  15  may be designed as a smooth surface or with grooves extending at right angles or obliquely not shown. The saw cable  19  is additionally guided by the deflecting roller  13  between the cable guide rollers  5 ,  9  during use, as a result of which vibrations between the workpiece and the saw cable guide  1  or the cable saw (not shown) are reduced. 
     Furthermore, the pivot housings  7 ,  11  may be designed as hollow housings, in which case the saw cable  19  is led through the pivot housings  7 ,  11  and is flush with the pivot axes  8 ,  12 . The guiding through the hollow pivot housings  7 ,  11  is used for safety as a cable catch in the case of possible cable breaks and additionally prevents the cable from snapping backward. The oblique extension arms  20  and the distance between the rollers and the pivot housings  7 ,  11  are selected to be such that the saw cable  19  guided along the pivoting axes  8 ,  12  runs up onto the cable guide rollers  5 ,  9  tangentially. 
     Various modifications of the embodiment shown are possible. On the one hand, another type of deflecting means may be present between the cable guide rollers arranged at an angle in relation to one another instead of the deflecting roller  13 . Likewise, the mounting of the cable guide rollers  5 ,  9  may vary as well. The deflecting roller  13  may have an additional vertical adjustment in relation to the sleeve  16  and the cable guide rollers  5 ,  9 . An oblique position of the deflecting roller  13  is optionally also possible. 
     While specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.

Technology Category: b