Triangular ruler of bow compasses

The utility model discloses a triangular ruler of bow compasses, including set square, slide rail, axis of rotation, litter, slider, circular slot, sliding shaft scale, set square scale, hinge, solidfixed cone, draw -in groove, long handle bolt, pencil fixed orifices, spout and pulley. The beneficial effects of the utility model are that: the utility model discloses with set square and compassesperfect adaptation, not only can be used for the different radial circles of drawing but also can regard as ordinary set square to use, can not produce the phenomenon of mutual interference in the middle of moreover, realized a learning tool multiple use, make the drawing bowlder more convenient, quicker moreover, great improvement the efficiency of drawing, can fold between axis of rotation and the slide rail, need not need the drawing bowlder, can rotate the axis of rotation and put in draw -in groove department, avoid the interference that the axis of rotation used the set square and be more convenient for accomodat