An Improved Dental Engine or Lathe

23,411. Schwalm, R. Nov. 19. Dental engines.-A dental engine or lathe is constructed so as to carry on a single shaft boring, drilling, cutting, grinding, polishing, and cleaning tools. The lathe head 4 is provided with three bearings 1, 2, 3, in which is mounted a tubular shaft 15 carrying a driving-pulley 7, a cleaning- roller 8, and cutter-head 13 with a brush 12 and cutter 14 thereon. A sleeve 10, which can be locked to the shaft, when required, by a screw 33, carries grinding and polishing wheels 9, 11. These wheels may be moistened by sponges &c. mounted in clamps 27 carried by a rod 26..The boring-tool is operated in the usual way through a flexible shaft 34 connected to the spindle 29 passing through the shaft 15 and capable of being locked thereto by replacing the cutter-head 13 by a sleeve 16 with a pin which engages slots in the spindle 29 and shaft 15. In place of employing the sleeve 16, a sleeve carrying a second flexible shaft for another drill may be used to lock the spindle to the shaft. An adjustable bar 22 serves as a hand-rest when sharpening tools, and a screen 28 is provided to confine the dust. The lathe head is mounted on a standard 5 working in a socket 6, and is kept from rising by a set-screw 39 engaging an annular groove in the socket. A rod 23 and set-screw allow vertical adjustment, and a spring 41 prevents too easy movement. The set-screw 39, if tightened up, prevents the head from swivelling.