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.8r A. Howarth? s Improvements in Dental Lathes. and Ireland, the Channel Islands, and Isle of Man, an Invention for c< Improvements in Lathes for Dental and other Purposes,” upon the condition (amongst others) that we, the said William Howarth and Ambrose Howarth, our executors or administrators, by an instrument 5 in writing under our, or their, or one of our or their hands and seals, should particularly describe and ascertain the nature of the said Inven¬ tion, and in what manner the same was to be performed, and cause the same to be filed in the Great Seal Patent Office within six calendar months next and immediately after the date of the said Letters Patent. 10 NOW KNOW YE, that we, the said William Howarth and Ambrose Howarth, do hereby declare the 'nature of our said Invention, and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement (that is to say) :— The object of this Invention is to enable ten or other convenient 15 number of tools used by dentists, or bone, ivory, and jet workers to be put in operation at the same time, thereby economising time and labour in finishing dental and other work. The headstock of our improved lathe consists of a spindle with a toothed wheel at each end; these wheels gear into pinions fixed on 20 short axles, each set being supported in a box with a face plate. These short axles have taper sockets in which the different tools are fixed, and the articles of dentistry or other articles to be operated upon are presented to the different tools in succession. Our Invention may be modified by making the driving pulley with an 25 internal toothed wheel on each side, and thesd internal wheels gear into the pinions of twro sets of short axles, passing through stationary face plates. These short axles have sockets to receive the tools, as above described. a Z“ + f f Our Invention may be further modified by driving the short axles by 30 friction, instead of toothed gearing, as described. And in order that our Invention may be fully understood and readily carried into operation we will proceed to describe the accompanying Sheet of Drawings, reference being had to the figures and letters marked thereon.
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