US2007884A - Dental carving machine - Google Patents

Description

July 9, R935 H 5P|RQ 2,@U7,%

' DENTAL GARVING MACHINE Filed Sept. 25, 1935 5 Sheets-Sheet l Jufly Q, W35. H. SPIRO fi fi DENTAL CARVING' MACHINE Filed Sept. 25, 1955 s Sheets-Sheet 2 Patented July 9, 1935 STAT-es I DENTAL' CARVING MAoniNE Harry Spiro, Chicago; 111-,

Research Corporation,

assignor to Dental ph cago, 111., acorpora- Application September 25,1933, serial No; (i9l),908

it is frequently necessary or desirable to carve or chisel certain parts. One of thefeatures of my invention is the provision of such a machine by which parallel surfaces may be readily made.

My invention 1's particularly applicable in con 7 nection with the making of bridges as disclosed in my co-pending application, Serial "No. 632,203, filed September 8, 1932. In that application I disclosed a method of mounting bridges by the use of adapters on the abutinent teeth. In the practice of that process it is necessary or desirable" to provide said adapters with parallel surfaces. This can be accomplished very readily bythe use of the carving machine herein dis closed.

Another feature of my invention is'the provisio-n of means for fastening a cast on a universally mounted support where the same is at: cessible by the carving too-1s. I i i Another feature it of my invention is the provision of an improveddowel adapted to be imbeddecl in a castto permit the same to be removably supported on the work support.

Other features and advantages of my invention will appear more fully as I proceed with my specification. i

In that form of device embodying the features of my invention shown in the accompanying drawings- Figure 1 is a view in side elevation; Fig. 2 is a view in front elevation; Fig. 3 is a view similar to Fig. 1; Fig. 4 is a vertical sectional View through one of the tool carriers; Fig. 5 is a similar view through the other tool carrier; Fig. 6 is a view taken as indicated by the line 6 of. Fig. 5; Fig. 7 is a top plan View of a plate for mounting the dowel pins in the cast; Fig. 8 is a view taken as indicated by the line 8 of Fig. '7; Fig. 9 is an end View of the plate of Fig. 7; Fig. 10 is a vertical sectional view through the work support; and Fig. 11 is a top plan view of the work support.

As shown-in the drawings, the device includes a platform ill, a post I l mounted on the platform and a horizontal arnr I2 carried by the post.

it indicates a universally mounted work sup port with a base H! adapted to be slidably posiworm 39.

work support carving tool l5 and the arm I? carries a vertically reciprocable carving tool Hi.

I For the purpose of mounting a cast (for examplaa ctistll as shown in Fig. 8) on the work support I3,sa id cast is rovided with'two dowels 18, I8 spaced a predetermined distance apart. This is accomplished by providinga temporary supporting plate is (Fig. '7) upon which the cast I! is made. dowel pins 3 are positioned in this plate and the cast formed onthe same, .as shown in Fig. 8. The lower ends of the-'pinsarej provided with annular grooves it adaptedto be engaged by keyhole slots 2i] in the slide-2| in the plate l9. The upper ends of the dowels 18 are provided With annular recesses I8 to iormlocks with the plaster cast-ll. The dowels I8 are positioned in the plate l9 and lockedwithihe slide 2 I and the cast is then formed on the plate. The slide 2| is then moved to-release the lower ends of the dowels, whereupon the cast can be removed with the dowels remaimng therein. The work support is (see Figz llliis provided with two holes 22, 22 also spaced the same-distance apart as the holes carrying the dowelsin the plate is. This work support I3 is also provided with a slide 23 having keyhole slots 24 similar to the slide 2i with its keyhole slots. Consequently, after the cast ll has been formed with the dowels It in place, it can be positioned on the work support l3 by placing the dowels in the holes 22 and locked thereon by movement of the slide 23 to cause the keyhole slots 24 to engage the grooves l8= in the lower ends of the dowels. In this way the cast can be releasably locked or positioned on the work support l3.

The universal mounting of the work support l3 on the base I4 is accomplished in the following manner. The base i4 is provided with a bifurcated support 30 having a horizontal pivot pin 3| carrying a worm gear 32. A worm 33 is provided for rotating the gear 32. This worm 33 may have an operating handle micrometerscrew 35 may be provided to show the degree of rotation. The upper portion of the wheel 32 carries a bifurcated support 3% with a pivot pin 31. A gear 38 is mounted on the bifurcated member 36 and is engaged by the ends of a bifurcated support 40 which carries the work support l3. The axes of the pivot pins 3| and 31 are both horizontal and at right angles 34 and a The pivot pin also carries the lower to each other. The worm 39 is adapted to be operated by the handle 46 and a micrometer screw 41 may be provided to show the degree of rotation. By operating the handles 34 and 46, either of the worms 33 and 39 may be turned in order to give any inclination desired to the work support l3.

The carving tool I5 is reciprocably carried in a sleeve 66 Reciprocation may be imparted to the same by an operating handle 6l'on the end of a spline shaft 62 extending through a worm 63. 64 indicates a gear engaging the worm 63. This gear is on a shaft 65 which also carries a gear 66 engaging the rack 61 on the post H. The shaft 65 is mounted on a carriage 65 which is vertically movable on the post. By this construction, rotation of the handle 6| will rotate the worm 63 to raise or lower the tool I5. This,

however, will not interfere with the reciprocation of the tool. The spline in the shaft 62 engages a screw 68 on the worm 63 to impart rotation to the same, the spline permitting horizontal reciprocations of the shaft 62 through the worm. The inner end of the shaft 62 is provided with an annular recess 10 engaged by a screw H on the end of the shaft '12 inside of the sleeve 66. The shaft 12 is preferably square to prevent rotation of the same in the sleeve. It will be seen, therefore, that the shaft 62 can be used to reciprocate the shaft 12 in the sleeve 60 and that the annular recess 16 will permit rotation of the shaft 62 to rotate the worm 63 to raise or lower the tool, as desired.

The tool I6 is mounted for vertical reciprocation in the arm l2. This tool I6 is carried on the lower end of the shaft 86 which is provided with an adjustable stop 8| to limit the downward movement of the same. Therlower end of the shaft is also preferably provided with a notch 82 adapted to be engaged by a springpressed ball 83 to yieldingly'hold the tool in its uppermost position out of the way. In orderto. permit vertical adjustment of the stop ,8], the same is made in the form of a sleeve threaded on the inner sleeve 96 which is mounted'on the shaft 80 by means of the set screw 9|, a plurality of indentations 92 being provided for engagement by the inner end of the screw 9|.

In the operation of the apparatus, the cast is made on a temporary supporting plate l9 and the dowels l8 correctly positioned therein. The cast may then be supported on the work support I3, the base of which rests on the platform ID. The desired angle of the work support may then be obtained and by use of the tools l5 and I6, parallel surfaces as desired may be cut on the cast, or any part thereof.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as permissible, in view of the prior art.

What I regard as new, and desire to secure by Letters Patent, is:

l. A dental carving machine, including; a platform; a post on the platform; a horizontally reciprocable carving tool mounted on the post, said tool being also vertically adjustable on the post; a handle for horizontally reciprocating the tool; and means whereby rotation of said handle will vertically adjust the same on the post.

2. Apparatus as claimed in claim 1., in which the vertical adjustment of the tool is effected through a rack bar carried by the post and engaged by a gear connected to the tool, said gear being rotated by rotation of said handle.

3. A dental carving machine, including; a platform; a post on the platform; a vertically movable carriage on the post; a horizontally reciprocable carving tool mounted on the carriage; a handle for horizontally reciprocating the tool with respect to the carriage; and means whereby rotation of said handle will vertically adjust the carriage.

4. Apparatus as claimed in claim 3, in which the vertical adjustment of the carriage is effected through a rack bar carried by the post and engaged by a gear mounted on the carriage, said gear being rotated by rotation of said handle.

HARRY SPIRO.

Images