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I T. W. GRAYDON.
No. 225,365. Patented Mar. 9, 1880.
Inventor: W Graydon
WASHINGTON. D 04 UNITED STATES PATENT OFFICE.
THOMAS W V. GRAYDON, OF CINCINNATI, OHIO.
SPECIFICATION forming part of Letters Patent No. 225,365, dated March 9, 1880,
Application filed February 7, 1880.
To all whom it may concern:
Be it known that I, THOMAS W. GRAYDON, a citizen of the United States, residing at Oincinnati, in the county of Hamilton and State of Ohio, have inr'ented new and useful Improvements in Dentaphones, of which the following is a specification.
This invention relates to improvements in folding den taphones, or instruments for transmittin g sound to the auditory nerve of a deaf person through the teeth.
My present invention consists in the combination, in a dentaphone, of a diaphragm composed of a main or base section and a side section or leaf (one or more) hinged together at various points along their edges in the direction of their length, with their edges overlapping each other to form stops for the sections when completely unfolded for use.
In the drawings, Figure 1 is a front perspective view of my improved dentaphone unfolded, ready for use. Fig. 2 is a similar rear view of the same; and Fig. 3 is a perspective iew of the dentaphone folded, to secure compactness and portability.
Referring to the drawings, the diaphragm is shown as being composed of three sections, in which A designates the main or base section, and B O the side or leaf sections. These sections may be made of metal, hard rubber, eollodion, or other suitable material; or they may be made of a fabric possessing an elasticity equal, or about equal, to the material named.
The side or leaf sections are made in the present example nearly equal in length and in width to the main or base section, and are each hinged or pivoted upon the said main or base section at various points along their 1011- gitudinal edges, preferably by what are termed in the arts rule-joints having stops; but other forms of joints can be employed by providing the main or base section with suitable stops, to limit the outward swing of the side sections or leaves when unfolding the sections to form an expanded homogeneous diaphragm.
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