US1147594A - Dental tool. - Google Patents

Description

C. C. BALL.

DENTAL TOOL.

APPLICATION FILED APR. I. 1915.

1,147,594., Patented my 2o, 1915.

CALVIN C. BALI, 0F HUNTINGTON, WESiT VIRGINIA.

DENTAL 'JJoonl To all whomz'tl-may concern.' i. y

Beit known that I, CALVIN C. BALL, a

citizen of the United States, and resident which is drawn between the teeth over the.

filling to, be finished, the strip being held in place against the filling by the thumb and finger, a method which being objectionable for obvious reasons, is also objectionable in that the operator cannot seethe filliiig being operated on since it is neces 3 is a section on the line 3-3 of Fig. 2.

sarily covered by the thumb, or finger, and it is impossible at all times to accurately` control. the direction of movement of the strip'for slightly more pressure on one edge of the strip than on the other will cause it to deviate from the desired direction and result either in injurious contact of the strip with the gum (when no separator is used) or to have such contact with vthe filling as to cut it away. L

The object of my invention is to provide an instrument which will obviate the objections noted and which will haveother advantages, such as the utilization of power, as from the dental engine to impart the movement to the finishing strip with consequent greater speed in the performance of the operation, and convenience and comfort to the operator.

In the accompanying 'drawings-Figure 1 is a perspective view of a dental instrur'nent constructed in accordance with my invention; Fig. 2 isa view'partly in side elevation and partly in vertical section; Fig.

Briefly described, my invention in the form which I now regard as its best embodiment, comprehends the use of a continuous,

or endless band of such material, as metal, cloth, celluloid, or paperof which finishing strips are ordinarily made, which is carried over and supported by suitably arranged guides in the form of wheels, or pulleys to Specification of Letters Patent. Application filed- April 1, 1915. Serial No. 181,562.

Patented July 2o, 1915.

lone of which motion is imparted by suitable driving connections with', the dental engine,

= and thereby the desired movement imparted y to the finishing strip. v

Referring in detail'to theV structure lshown in the accompanying drawings, it will be found that la casing head l0 is employed onV the outside of whichat': one side is' located vthe driving pulley 11 and from which'project two larms 12 that preferably diverge from each other, each of which at its outer l Vend supports a guide pulley 13. Over the .three pulleys is placed a continuous, or endless band 14 that constitutes the l'finishing strip, which band, as I have indicated, may be of any desiredmaterial suitable for the purpose and having such width and thinness as may be required. v It will thus be seen that thefinishing stripis supported by an open frame and the two pulley-cairying arms are mounted for movement toward and from each other as by being made of spring material, their normal position being the one where their pulleys are most widely separated. The portion of the finishing strip extending between the two pulleys 13 is the portion that is applied to the filling and by reason of the capability of the pulley-carrying arms to move toward each other it will be seen that by pulling against thefilling such portion of the strip will be changed from lts straight direction and caused to conform to a rounded surface and thereby give a convexly rounded conforma*- tion to the fillin The flexibility which the spring arms a ord is also important in facilitating the application of the finishing strip to the tooth filling to be operated upon and also lin facilitating 'the changing o the strips when that is required. The -tension placed upon the strip by the spring tendency of the arms at all times maintains the strip in the taut position necessary to cause its movement by the driving action of lthe pulley 11.

. In order to compensate for differences in /the length of strips, one of the pulley-carrying arms is adjustable toward and from the other as by means of a thumb screw 15 which passes through an opening in the arm and enters a threaded opening in the side of the casing head 10, the arm being pivoted, or fulcrumed betweenV such thumb screw and the pulley, as by means oft' a fastening screw 16, so that according-to the portant function of a rest for the end of the thumb of the operator when holding the'instrument, the outer face of said thumb screw being dished, or concave and serrated or `roughened so as to afford a comfortable and firm bearing for the operators thumb when holding the instrument by means of the shank, or handle with `which it is provided and to the outer end of which-the casing head 10 is attached, all as more particularly hereinafter described.

In order' to increase thel angle of peripheral contact of the nishing strip with the driving pulley, an idler pulley, or guide roller 17 is mounted on the top of the casing head well to. one side of the middistance between the pulley-carrying arms Where they extend outward from said head, so that the portion of the finishing strip passing fr om the driving pulley to one of the guiding pulleys 13 insteadl of extending tangentially from the driving pulley to said guiding pulley 13, it is carried over the driving pulley fairly close to the portion o f the strip running tangentially from the driving pulley to the other driving pulley 11.

The driving pulley 11 is in the lform of a sleeve which is journaled on a stud 19 that projects from the inside of one of the side walls of the casing head and Within the casing on said sleeve is a bevel gear 20 with whichimeshes a bevel pinion 21 upon the upper end of a shaft 22 Which extends through the shank 23, and a detachable connecting piece 24 for coupling the instrument to the engine hand piece and for connecting said shaft with the engine shaft. The connection between the connecting piece and the'shank is a threaded detachable one so that bychanging the connecting piece according to the engine hand piece my instrument is rendered universal, or adaptable to dental engines generally.

ln order to increase the, friction of the driving pulley upon the finishing strip, the strip-engaging surface of the pulley may be formed of rubber, or other suitable material. The pulley has a flange formed by a disk 25 which is secured` by a screw tothe outer end of the pulley journaling stud. rlhe stud is made tubular, or hollow throughout its length to form in rear of the screw an oil chamber from which oil may pass outward and find its way between the pulley sleeve and the exterior of the stud for 1ubricating purposes. Each of the strip guide pulleys 13 is similarly in the form of a tube orsleeve upon a hollow, or tubular stud that projects from the carrying arm, so that -similar provision for lubricating is pfvided.

For convenient access to the interior of the casing head, one side thereof, to which may be integrally attached the top, is removably secured by screws, and for oiling the rotating parts within the casing head, an oil hole having a suitable cover may be provided.

While the-construction illustrated in the drawings is a very desirable embodiment of my invention, it is to be understood that my invention is not restricted in its broad scope to any one construction and arrangement of the parts.

Having thus described my invention what I claim is- 1. As an improvement in dental instruments, the combination of ahead, a driving pulley mounted on said head, a pair of arms projecting from the head, a working strip in the form of a contin'uous band passing over said pulley and over oppositely situated supports on said arms, and means for revolving said driving pulley to impart movement to said strip.

2. As an improvement in dental instruments, the combination of a movably supported finishing strip in the form of a continuous traveling band, the supporting means comprising a frame' having members movable towardi and from each other, and means to impart movement to said sti'ip to cause it to travel With reference to said frame.

3. As an improvement in dental instruments, the combination of a movably supported finishing strip in the form of a continuous traveling band, the support comp'ising a pair of spring arms, and means to impartemovement to said strip to cause it to travel with reference to'said frame.

4. As an improvement in dental instruments, the combination of a head, a movably supported finishingv strip, said supporting means comprisingan arm mounted t0 rock on said head, an adjusting device for said arm that forms a thumb rest, and means to impart movement to said strip.

5. As an improvement in dental instruments, the combination of a casing head,.a pair of spring arms extending therefrom, each carrying a pulley, a driving pulley mounted on the casing head, a finishing strip extending over said pulleys, and gearing for revolving said driving pulley mounted in the casing head.

6. As an improvement in dental instruments, the combination of a casing head, a pair of spring arms extending therefrom, each carrying a pulley, a driving pulley mounted on the casing head, a finishing strip extending over said pulleys, gearing for revolving said driving pulley mounted in the casing head, and a shank for said casing head including a detachable engine-connecting piece.

7. As an improvement in dental instruments, the combination of a casing head, a strip from the driVing pulley to one of the pair of spring arms extending therefrom, arm-supported pulleys. 10 each carrying a pulley, a driving pulley In testimony that I claim the foregoing mounted on the casing head, a nishing I have hereunto set my hand.

strip extending over said pulleys, gearing CALVIN C. BALL. for revolving said driving pulley mounted Witnesses: in the casing head, and a'guide for the CHAs. E. BOOTH,

finishing strip to change the direction of the LEVEZEY.

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