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857,931
wrench or similar tool whereby the screw may be adjusted to vary the position of the cutter. When it is desired to plane or dress the 5 commutator, the brush yoke and brushes are removed from the casing and the supporting plate 8 extended transversely across the opening 9 in said casing and secured in posi- tion thereon by means of the bolts 11'. The t o cutter is then adjusted and the motor start- ed, the operator gradually turning the hand- wheel 23 so as to cause the cutter to travel over the entire surface of the commutator and thus effectually dress the same. After T5 the truing or dressing operation is completed the tool is removed from the motor and the brush and yoke again placed in position and fastened in the usual manner. From the foregoing description it is thought 20 that the construction and operation of the device will be readily understood by those skilled in the art and further description thereof is deemed unnecessary. Having thus described the invention what 25 is claimed is: 1. A device of the class described compris- ing a supporting plate having a longitudinal slot formed therein, a cutter carrying bar ex-
tending through said slot and having its up- per end provided with a transverse recess, a 30 key extending through the transverse recess, a bearing plate interposed between the key and the upper surface of the supporting plate, and a clamping screw threaded in the bar and bearing against the key. 35 2. A tool of the class described comprising a supporting plate having a longitudinal slot formed therein, a cutter carrying bar extend- ing through said slot and provided with a transverse recess, a shoulder formed on the 40 bar and adapted to engage the supporting plate, a locking key seated in the transverse recess, a clamping screw carried by the bar and engaging the key, and a threaded rod journaled in the walls of the slot and extend- 45 ing through a correspondingly threaded opening in the bar for adjusting the latter longitudinally with respect to the supporting plate. In testimony that I claim the foregoing as 50 my own, I have hereto affixed my signature in the presence of two witnesses. CLAUS HENRY FRICK. Witnesses: SAMUEL MEYERS, TOM J. DESMUKE.