Improvements in the construction of suction valves for exhausting air from chambers in artificial palates for dental purposes / [John Louis Pigot Leman].

  • Leman, John Louis Pigot.
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in the construction of suction valves for exhausting air from chambers in artificial palates for dental purposes / [John Louis Pigot Leman]. Source: Wellcome Collection.

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    5 10 15 20 25 bate oi Application, 30th July, 1888 Specification Accepted, 14th Sept., 1888 A.D. 1888, 30th July. N° 10,994. COMPLETE SPECIFICATION. Improvements in the Construction of Suction Valves for Exhausting* Air from Chambers in Artificial Palates for Dental Purposes. I John Louis Pigot Leman of 18 Claremont Road, Surbiton in the County of Surrey, Dental Surgeon, do hereby declare the nature of my said invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement:— The object of my invention is to improve the construction of valves fitted in such artificial palates as are retained in their places by suction, by providing improved means of obtaining and retaining a vacuum between the natural and artificial 1 o o palates. And in order that my said invention may be particularly described and ascertained reference is hereby made to the accompanying drawings in which similar letters ot reference indicate corresponding parts ; such drawings being made to an enlarged scale for greater clearness. Fig. 1 is a plan view of a metallic disc having a central hole h as shown. Fig. 2 is a section of the same on the line x y of Fig. 1. Fig. 3 is a plan view of the valve case, the cylindrical portion being made smooth on its inner surface, as shown in Fig. 3, or corrugated as shown in Fig. 4. Fig. 5 being a section on the lines v w of Figs. 3 and 4, with the exception that the screw thread is shown in Fig. 5 instead of the plain and corrugated surfaces shown in Figs. 3 and 4. Figs. 6, 7, 8 and 9 shown forms of the inner valve case e which is fitted into the valve case c to keep the valve disc /in its place. This inner case ^ may be constructed as a plain cylinder as shown in Fig. 6, or, it may be corrugated inside and plain out¬ side as shown in Fig. 7 or plain inside and corrugated externally as shown in Fig. 8, or corrugated both externally and internally as shown in Fig. 9. Fig. 10 is a section of the inner valve case e in which section the outside of the cylinder is showrn formed with a screw thread to fit the inside screw thread shown in rig. 5, /(Fig. 11) is a plan of the valve disc which rests upon the raised annular seat d. [ Price 6J.]