The U.S. Patents of Nikola Tesla

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electric apparatus which sliding contacts with intervening insulating material are employed, the combination, with the con­ tact springs brushes, solid insulator 95 bad conductor electricity, and for the purposes set forth. similar view, represent- 50 ing two plates mica upon the back the brush. 1885. My invention enables prevent the sparking simple manner. . SPECIFICATION forming part Letters Patent No. My invention relates the commutators on dynamo -electric machines, especially in machines great electromotive force, adapted io arc lights; and consists device by means which the sparking the commu­ tator prevented It known that machines great elec­ tromotive force—such, for instance, those 15 used for arc lights—whenever one commutator bar plate comes out contact with the col­ lecting-brush spark appears the commu­ tator. Serial No. In Fig. Application filed May 6,1885. 334,823, dated January 26,1886. 55 are springs, the pressure which may ad­ justed means the screws g. 104,534. NIKOLA TESLA, SMILJAN LIKA, AUSTKIA-HUNGAKY, ASSIGNOK THE TESLA ELECTRIC LIGHT AND MANUFACTURING COMPANY, RAHWAY, NEW JERSEY. Tesla, of Smiljan Lika, border country Austria-Han­ gary, have invented Improvement Dy- 5 namo-Electric Machines, which the follow­ ing specification. simple arrangement shown with two plates mica other material.) To all whom, may concern: Be known that Nikola. Signed this day May, D. 80 My invention may applied any elec­ tric apparatus wflvich sliding contacts are employed. I prefer use asbestos paper cloth im­ pregnated with zinc-oxide, magnesia, zirconia, or other suitable material, the paper and 75 cloth are soft, and serve the same time to wipe and polish the commutator; but mica or any other suitable material may employed, said material being insulator bad con­ ductor electricity. (No model. This spark may due the break of the complete circuit, shunt low re- 20 sistance formed the brush between two or more commutator-bars. NIKOLA TESLA. I claim invention—• 1. 2. 65 My invention may carried out many ways; and not limit myself any particu­ lar device, invention consists, broadly, in providing solid non-conducting body to bear upon the surface the commutator, 70 the intervention which body the sparking is partly completely prevented. For this pur­ pose employ with the commutator bars 40 and intervening insulating material mica, as­ bestos paper other insulating and prefer­ ably incombustible material, which arrange to bear the surface the commutator, near and behind the brush. Pinckney, W illiam Mott. the first case the spark more apparent, there the mo­ ment when the circuit btoken discharge of the magnets through the field-helices, pro- 25 during great spark flash whicli causes an unsteady current, rapid wear the commu­ tator bars and brushes, and waste power.nited States Patent Office. In the drawings, Figure section a commutator with asbestos insulating de­ vice'; and Fig. 45 invention will easily understood by reference the accompanying drawings. The sparking may reduced various de­ vices, such providing path for the cur- 30 rent the moment when the commutator segment bar leaves the brush, short-cir­ cuiting the field -helices, increasing the number the commutator-bars, other similar means; but all these devices are ex- 35 pensive not fully available, and seldom at­ tain the object desired. The combinatiou, with the commutator- 85 bars and intervening insulating material and brushes inadyuamo electric machine, ofasolid insulator bad conductor electricity ar­ ranged bear upon the surface the com­ mutator adjacent the end the brush, for 9c the purpose set forth. In Fig. COMMUTATOR FOR DYNAMO-ELECTRIC MACHINES. represents the commutator and intervening insulating material; the brushes, are sheets asbestns paper or other suitable non-conducting material. Witnesses: Geo. It will seen that whenever one commutator- 60 segment passes out contact with the brush the formation the arc will prevented by the intervening insulating material coming in contact with the insulating material the brush