Specification of William Howarth and Ambrose Howarth : dental lathes.

  • Howarth, William
Date:
1875
Catalogue details

Licence: Public Domain Mark

Credit: Specification of William Howarth and Ambrose Howarth : dental lathes. Source: Wellcome Collection.

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    W. fy A. EowarWs Improvements in Denial Lathes. Pig. 1 is a front view, and Pig. 2 a side view partly in section of a lathe constructed according to our Invention, a is the headstock sup¬ porting the spindle b, which is driven by a band passing around the grooved pulley c; at each end of the lieadstock is screwed the box d, furnished with a lid or face plate e, and at each end of the spindle is 5 keyed the spur wheel/. These wheels gear into the pinions g, one of which is shewn detached in Pig. 3, and these pinions are fixed on the hollow axles h, which revolve in holes in the face plates e and boxes d. The axles h have taper sockets in which the different tools are fixed; the ends of the spindle b are also provided with sockets for other 10 tools. In the lathe above described and illustrated we have shewn ten tools, but the number may be increased or reduced, and the various articles of dentistry or other articles of bone, ivory, jet, or other substances to be operated upon can be presented in succession to the different tools, 15 thereby effecting a great saving in time and labour, and avoiding to a great extent the necessity of changing the tools. Fig. 4 is a front view, and Pig. 5 a side view partly in section of another of our improved lathes. In this case the headstock a supports the spindle b} which is driven by a band passing around the grooved 20 pulley c. This groove is formed in the circumference of the double internal toothed wheel i3 keyed on the spindle b. Each internal wheel gears into four or other convenient number of spur pinions g fixed on the hollow axles h3 in which the various tools are held, as before described. These hollow axles revolve partly in the face plates e3 which 25 are screwed to the headstock a and partly in the plates j, which are screwed to the face plates. At each end of the spindle b is screwed a socket Jc for supporting the emery discs l or other tools. Our Invention may be further modified by driving the short axles h by friction, instead of toothed gearing, as shewn. 30 Having thus stated the nature of our Invention, and described the manner of performing the same, we wish it to be understood that we do not intend to limit ourselves to the details given, nor to the number of tools employed, as the same may be varied, and we claim the improved lathes for dental and other purposes, as shewn and described, in which 35
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