Improvements in electric motors for rotary dental tools and the like.

  • The Browning Manufacturing Company.
Date:
1900
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in electric motors for rotary dental tools and the like. Source: Wellcome Collection.

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    N° 1147 A.D.1900 Date of Application, 18th Jan., 1900—Accepted, 24th Feb., 1900 COMPLETE SPECIFICATION. Improvements in Electric Motors for Rotary Dental Tools and the like. I, Peter Jensen, of 77, Chancery Lane, in the County of Middlesex, Chartered Patent Agent, do hereby declare the nature of this invention, which has been communication to me from abroad by The Browning Manufacturing Company, of Number 125, Michigan Street, in the City and County of Milwaukee ° and State of Wisconsin, United States of America, and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement: — The invention has for its object to improve the construction of that class of electric motors designed for the operation of rotary tools, especially such as 10 are used in the dental art, and to that end, the said invention consists in certain peculiarities of construction and combination of parts, all as is more particularly described hereinafter in connection with the accompanying drawings, and subsequently claimed. Description of the Drawings. 15 Figure 1 is a view in front elevation of the said electric motor arranged in a suitable standard in connection with a controlling device, for operating a dental engine. Figure 2 is an end view of said motor, with its protecting shell removed, showing also part of the supporting standard in section, and drawn to an enlarged 20 scale. Figure 3 is a sectional view of said motor, taken on the line 3—3 of Figure 4, and Figure 4 is another sectional view of said motor, taken on the line 4—1 of Figure 3. 25 Referring by letter to the drawings, A represents the supporting standard, consisting of a hollow shank terminating in a flat base plate, a, which rests upon the upper surface of an electric lnotor controlling device, or switch apparatus B, to which the said base-plate a is secured, by screws as shown, the controlling device B having suitable legs h b which thus become the legs or sup- 30 ports of the motor standard A. At its upper end, the said standard A is expanded into a ring C, having a socket c at the top, for the reception of an arm D, which in turn, at its upper end, is formed with a socket d, to receive the lower end of the rod E, designed for the support of the usual flexible shaft (not shown) of a dental engine, rotated by a belt (also not shown) from a pulley e, on the herein- 35 after described armature-shaft I. Fitting within the standard ring C is the annular frame F of the field-magnet, formed integrally with the shanks f f of the pole-pieces G G. the latter being made separate and independent from the pole-shanks, to which thev are after¬ wards secured, by the screws g g as hereinafter explained. IT H indicate the *1 hold-coils, fitting around the pole shanks f f, as shown. The opnosed ends of the oole-pieces G G are secured together by the connecting-pieces Ji which are made preferably of brass or other non-magnefic material and formed with [Price 8c/.]