US 781420 A
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110.781,420. K PATBNTED 11111.31, 1905. 1.11.11ALDBMAN.
, AP`PLIOATION FILED JAI. 8,1904.
`provided with the post;
UNITED STATES Patented January 31, 1905.
JOHN E. HALDEMAN, or KANSAS CITY, MISSOUEI, ASSIGNOE vOE ONE- HALF To OLIVER o. HALDEMAN, OE KANSAS CITY, MISSOURI..
SPECIFICATION forming part of Letters Patent No. 781,420, dated. January 311905.
' Appiicanon ned January 8,1904. semi No. 188,178.
To all whom it may concern:
Be it known that I, JOHN R. HALDEMAN, a
citizen of the United States, residing at Kan sas City, in the county of Jackson and State of Missouri, have invented certain new anduseful Improvements in Artificial Dentures, of which the following isa specification.
My. invention relatesto improvements in dentistry; and my object is to provide a crown gage the undercut and a resilient member for detachably holding-the lug in the undercut portion.
In the accompanying drawings, which illustrate the invention, Figure l represents an enlarged detail sideelevation of my improved post. Fig. 2 is a vertical sectional View 'of a crown provided with the post. Fig. 3 is a vertical Section of a modified form of crown Fig. 4L is a vertical section of same, taken on line IV IV of Fig. 3.
In carrying out the invention I employ a crown 1, having a centrally-located socket 2 and an undercut portion 3 communicating with the inner end of the socket.
4; designates a post reduced at one end so that it may bereadily introduced into' the canal of the root and provided at its opposite end with a rectangular lug 5, adapted to snugly fit the undercut `portion 3, in which latter it is reliably held by a resilient member 6, formed integral withor otherwise suitably Secured to the post.V Member 6 extends from a point about midway between the opposite terminals of the post to within a short distance of the lug end of the latter and tapers toward its free end to leave a space 7, slightly wider at its open end than shoulder 8 of the lug, so that when the resilient member is compressed against the back of the post the llatter may be-readily inserted or withdrawn from the Socket in the crown. By thus detachably securing the post to the crown it'A is obvious that the latter can be vmore readily and accurately fitted to the eX- posed extremity of the root.
After the crown has been properly fitted to the root the post is placed in position in the former, where it is permanently secured by cement applied inthe well-known manner and which after filling space 7 solidifies and prevents compression of member 6, so that lug 5 cannot be removed from undercut 3. Cement is then applied tothe exposed portion of the post and the latter is inserted in the canal of the root.
Inl the modiiied form shown in Figs. 3 and 4 the undercut portion is provided with a ,transverse pin 9, which is semicircular at its upper portion, so that when the tapering lower end l0 of the post is pushed downwardly against said curved portion the post will move backwardly toward member 6 until lug 5 clears the edge of the pin, when it may be pushed downwardly until shoulder 8 engages the under side of the pin,` as shown in Fig. 3. f
From the above description it is apparent that I have produceda crown and a post cornposed of few parts, but well adapted for the purpose intended.
Having thus described my invention, what I claim, and desire to secure by Letters-Patent, is-
l.l A posty comprising a rigid member, a lug at one end of Said rigid member, and a tapering resilient-member formedintegral with the ,intermediate portion of the rigid memberand terminating at its reduced end in the rear of the lug; a crown provided with a` socket, and means communicating with the socket adapted to engage the lug which latter 'is forced into engagement with Saidv means by the resilient member. l
2. A post comprising a rigid member taperingq toward one end, a rectangular lug at i onel side of said socket to receive the lug on the opposite end of the rigid member, and a. tbe rlgid member of the post. IO tapering resihent member formed integral i In testimony whereofI afix my Slgnatureln with the intermediate portion of the rigid the presence of two Witnesses. member and terminating at its reduced end in the rear of the lug end of the rigid mem- Witnesses:
F. G. FISCHER, LESLIE E BAIRD.
JOHN R. HALDEMAN.'
ber; and a crown provided with a socket baving an undercut portion communlcating With i