US2488036A - Inlay remover - Google Patents

Description

Nov. 15, 1949 PQFCHER 2,488,036

INLAY REMOVER Filed Oct. 22, 1947 IIIIMIIIIIIIII Inventor Frank R. Pofcher Patented Nov. 15, 1949 UNITED ENT EICE 2 488,036 .lNLAXi' MQYER Frank Rofcher, 'Venice ,'Calif.

;-;Anplieati on..0.ctoher 22, 19 i7,, $eri l.NQ-,181,254

Chime If 1 r T s entio appertain to. novel. a d. .u e improvements in dental? instruments.

One; object ofthis invention istoliftthe inlay of a tooth therefrom. easily, conveniently, and painlessly.

Anotherobject ,of this invention :iS, to previde mea s for car out the abo e n io ed n tion.

;A further object of thisinventionis tovprovide a sleeve having a vision slot-therein,-frictipn conducive means ;at the bottom ;,port ion thereof adapted to seat .ona tooth.

Another purpose of this invention is to pro: vide ahollow shaft in said sleeve having antirotation means associatedtherewith ,and means f r lif the a d l w shaft fro h said sleeve.

7 Another purpose ofthisinvention .is to proe a pin in sa d holl w. hafthav nemea s-at one end thereof adapted, to be anchoredin-an inlay and means at. the other-endthereof. adapted to seatonthe hollow shaft, to be lifted therewith, while the said sleeve remains in Contact. with the said tooth.

Another purpose ofzthis.inventionistoprovide a convenient handle :for retaining. the said Sleeve and other operative associated elements I in; the .desired position relative to the said tooth during th lifting operation.

Another purpose ofthis invention is-to. provide an extremely inexpensive device of. the character described which lends itself well -.to. commercial manufacture and; common shop practices.

Ancillary-obj ects land features oft-novelty will become apparent to-those skilled inthe art, in

following, the description of the preferred form pf the invention, illustrated in theeaccolllpallyilflg drawings, wherein:

Figure 1 is a longitudinal sectional view. of the preferred formof the present invention showing .its use in association with a conventional tgoth;

Figure 2 is an explodedselevational view f ,certain operative elements f ormi-ng part ;of the. present invention;

Fi e his a bo t m v w-of: he s e zutil zed in association with the present invention andv .illustrating the frictionconducivemeans pertinent thereto; and

Figure .4 is an elevailionallside =view of the. cenra-l s a adaptedrto n a e. and. fri t na bind a filling prior to the removal thereof.

Referring now in detailto the illustrated preferred form ofv theqinvention; efer nqelis: made p r y to t e ac ompanyin drawings: wh r inlays of; conventional teeth after breaking the eement bond between the said teeth and inlays.

'1hemeans for carrying out the above-mentioned function characterizesthe major portion of-the present invention which is composed of any suitable material, preferably-metallic. l A sleeve [0 is provided with a vision slot l2 at-the bottom portion thereof. This-slot serves another function namely, to compensate for certain--irregularities found in certain portions of teeth-by providing diametrically positionedlegs as shown. Friction conducive means isprovidedat the-bot tom portion of the said legs and is preferably in the form of a plurality of ridges or teeth l4.' An internally threaded aperture l6is provided in the said sleeve perpendicular to :the bore=thereof.

=A hollowl'shaft 18 having external threads the full length'thereof .is provided with a keyway 20 which is adapted to align withthe saidaperture 16.x0f course-the said hollow shaft l8 isslidably received in :the. said sleeve .1 0, as is :clearly evident from an inspection of: Figure 1.

.':A handle 22 having athreaded portion 24 adjacent one end thereof. is adapted to .be secured -to:-the said sleeve :10 through: the medium of .the internallythreaded aperture I6. A small lug-3Z6 extends from the threaded portion :24, and .projects in the said keyway 20, therebypreventing relative rotation between the 1 said :sleeve I 0; and hollow shaft 18.

Means for lifting-the ,said hollow shaft 3 l 8=from the-saidsleeve is provided. "This means may heho as anihternally threaded collar 28 which i thr adedl re iv d h said h l w =-sha t l T s; ter a t e d ll r .01; nut 28 has a. ..a. nula flan e h re ouhd-whi h seats2:di-. :restlvon he a dsleeve ML :05. cpursaa psu ableto may he; u iz f rt e unease -0 -.rotafih hese nut fl-such a: sneeia -=p *-9vi e wreeeh- Means r nch rin a nl ys Y tw lve? through he-[b re fthe sa d e e nall thr aded hello-w -,shaft .18. Inspection o Fi ure- 4;=.C y discloses this element which is obviously a ..p i n 3. havi a -.-en1a. ement, xternally thre d thereon. vgins. enlar me t is threaded re .c ved i t e in a 4 of t co vent altteo h 3B. ,Af-tereffecting the anchor in this-gnannen t e-semL-sph i a sea Btwil th nhe noel-tiered on ,or adjacent. the upper portion .of the said. hole .lowshaft l8. Upon -rotation ,;of the saidinter- .na yr h easled ll r 12 th head fi fthe 2 30 wl lb i t rela ive-to t e,,. e. Jilthfi sby ting the-shaman, th sl i m ner-en u h in there isillustreted an ericeafgr;lifting-the te-hreakthe. heme-.1112.hondhe neee the-said felay 34 and the said tooth 36. The upper portion of the semi-spherical seat 38 may be flattened on the sides for the purpose of receiving a wrench thereon. Of course, a suitably devised wrench having the proper jaw sizes at each end may be used for rotating both the internally threaded collar 28 and the flattened portion 40 of the said shaft 30.

In more detail, the operation is as follows: It is assumed that the threaded hollow shaft I8 is slidably inserted in the sleeve Ill with the collar 28 screwed just far enough down the hollow shaft to hold the two together. The collar rests upon the upper end of the sleeve. The keyway 20 of the hollow shaft is aligned with the aperture I6 in the sleeve I0, and the handle 22 is screwed into the aperture, and the lug 26 enters the keyway 20. The handle thus enables the sleeve It] to be held firmly in a position on a tooth, and its lug prevents relative rotation between sleeve and hollow shaft while permitting relative axial movement. The pin 30 is loosely inserted through the hollow shaft.

The inlay to be removed may be drilled and tapped, if desired, to provide threads for receiving the pin 30.

The sleeve is then positioned on a tooth, with the ridges or serrations M of the sleeve legs engaging the tooth, to prevent slipping. This positioning should be done so that the tooth-contacting portions of the sleeve are external of the inlay 34 to be removed. This is shown in Figure 1.

The pin 30 extending loosely through the hollow shaft I8 is then screwed into the inlay by application of a wrench to the flattened head portion 40 of the pin, When this is done, the semi-spherical head portion 38 is engaged, or ready to be engaged, against the upper end of the hollow shaft l 8, depending upon how deep the pin has been screwed into the inlay.

It is now apparent that when the pin 30 is elevated relative to the sleeve ll), it will elevate the inlay, because the sleeve I is seating upon the tooth externally of the inlay, having no contact with, at least no seriously obstructive contact, with the inlay.

The elevating action is accomplished by turning the threaded collar 28 on the threads of the hollow shaft l8, while holding the handle 22 so that the sleeve l0 and consequently the hollow shaft l8 are held against rotation. As the collar 28 is rotated, bearing upon the upper end of sleeve ID, the hollow shaft I 8 is forced upwardly, and with it the pin 30, carrying the inlay with it.

While there has been described and illustrated only a preferred form of the invention, it is apparent that certain variations may be made without departing from the spirit thereof. Accordingly, limitation is sought only in accordance with the scope of the following claims.

Having described the invention, what is claimed as new is:

1. A dental inlay remover comprising a sleeve the lower end of which is adapted to rest upon a tooth, a hollow shaft externally threaded slidably positioned in said sleeve, said shaft being provided with an external longitudinal keyway, a handle extending outwardly from said sleeve and provided with an inner end extending through said sleeve and into said keyway in the hollow shaft to prevent relative rotation of said shaft and sleeve but permitting relative sliding movement thereof, an internally threaded collar threadedly engaging said hollow shaft and rotatably bearing upon the upper end of said sleeve, and a pin loosely fitting in the bore of said hollow shaft, said pin being provided with a head adapted to bear upon the upper end of said hollow shaft and provided with means at the lower end for securing to an inlay, whereby when the sleeve is placed upon a tooth the pin may be secured to an inlay in said tooth, the handle may be held to prevent rotation of said sleeve on the tooth and of said hollow shaft within the sleeve, and said threaded collar may be turned on the hollow shaft to draw said shaft outwardly from the sleeve and thereby force the pin outwardly with said hollow shaft, the pin lifting the inlay with it.

2. A dental inlay remover comprising a sleeve, said sleeve being slotted at the lower end affording vision through said slot and providing diametrically positioned legs adapted to rest upon a tooth, a hollow shaft externally threaded slidably positioned in said sleeve, said shaft being provided with an external longitudinal keyway, a handle extending outwardly from said sleeve and provided with an inner end extending through said sleeve and into said keyway in the hollow shaft to prevent relative rotation of said shaft and sleeve but permitting relative sliding movement thereof, an internally threaded collar threadedly engaging said hollow shaft and rotatably bearing upon the upper end of said sleeve, and a pin loosely fitting in the bore of said hollow shaft, said pin being provided with a head adapted to bear upon the upper end of said hollow shaft and provided with means at the lower end for securing to an inlay, whereby when the sleeve legs are placed upon a tooth the pin may be secured to an inlay in said tooth, the handle maybe held to prevent rotation of said sleeve on the tooth and of said hollow shaft within the sleeve, and said threaded collar may be turned on the hollow shaft to draw said shaft outwardly from the sleeve and thereby force the pin outwardly with said hollow shaft, the pin lifting the inlay with it.

3. A dental inlay remover comprising a sleeve the lower end of which is adapted to rest upon a tooth, a hollow shaft externally threaded slidably positioned in said sleeve, said shaft being provided with an external longitudinal keyway, a handle extending outwardly from said sleeve and provided with an inner end extending through said sleeve and into said keyway in the hollow shaft to prevent relative rotation of said shaft and sleeve but permitting relative sliding movement thereof, an internally threaded collar threadedly engaging said hollow shaft and rotatably bearing upon the upper end of said sleeve, and a pin longer than and loosely fitting in the bore of said hollow shaft, said pin provided with a head adapted to bear upon the upper end of said hollow shaft and having threaded means at the lower end for securing to an inlay, whereby when the sleeve is placed upon a tooth the pin may be secured to an inlay in said tooth, the handle may be held to prevent rotation of said sleeve on the tooth and of said hollow shaft within the sleeve, and said threaded collar may be rotated on the hollow shaft to draw said shaft outwardly from the sleeve and thereby force the pin outwardly with said hollow shaft, the pin lifting the inlay with it.

4. A dental inlay remover comprising a sleeve, said sleeve being slotted at the lower end affording vision through said slot and providing diametrically positioned legs adapted to rest upon a tooth, the end surfaces of said legs being serrated to minimize slippage of the sleeve on the tooth, a hollow shaft externally threaded slidably positioned in said sleeve, said shaft being provided with an external longitudinal keyway, a handle extending outwardly from said sleeve and provided with an inner end extending through said sleeve and into said keyway in the hollow shaft to prevent relative rotation of said shaft and sleeve but permitting relative sliding movement thereof, an internally threaded collar threadedly engaging said hollow shaft and rotatably bearing upon the upper end of said sleeve, and a pin longer than and loosely fitting in the bore of said hollow shaft, said pin provided with a head adapted to bear upon the upper end of said hollow shaft and having threaded means at the lower end for securing to an inlay, whereby when the sleeve is placed upon a tooth the pin may be secured to 6 an inlay in said tooth, the handle may be held to prevent rotation of said sleeve on the tooth and of said hollow shaft within the sleeve, and said threaded collar may be rotated on the hollow shaft to draw said shaft outwardly from the sleeve and thereby force the pin outwardly with said hollow shaft, the pin lifting the inlay with it.

FRANK R. POFCHER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 403,293 Rosenthal May 14, 1889 812,976 Carpenter Feb. 20, 1906 1,102,850 Arden July 7, 1914 1,666,860 Marancla Apr. 17, 1928

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