US3037282A

US3037282A - Adjustable twin dental handpiece

Info

Publication number: US3037282A
Application number: US775571A
Authority: US
Inventors: Aktarian Sarkis; Iossifidis Anastase
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-11-21
Filing date: 1958-11-21
Publication date: 1962-06-05
Anticipated expiration: 1979-06-05

Description

June 5, 1962 s. KTARIAN ETAL 3,037,282

ADJUSTABLE TWIN DENTAL HANDPIECE Filed Nov. 2l, 1958 vr e2 sa Smzms Awvmzmm E/ BY ANAS-mss ossmms QWAMMLMM AWTCQNEYS i' arent ffice 3,037,282 Patented June 5, 1962 3,037,282 ADJUSTABLE TWIN DENTAL HANDPIECE Sarkis Aktarian, and Anastase Iossifidis, both of 722 De Lepee, Outremont 8, Montreal, Quebec, Canada Filed Nov. 21, 1958, Ser. No. '775,571 9 Claims. (Cl. 32-27) This invention relates to an improved twin dental handpiece having improved means for adjusting twin instrument-holding rotors relative to each other.

The primary object of the invention is to provide a more efficient and accurately operating device of the character indicated which has a relatively stationary drive rotor and a floating driven rotor, an idler rotor being operatively engaged with both rotors, and bearing means engaged with the floating rotor whereby the iloating rotor is positively and at all times maintained with its rotational axis parallel to that of the stationary rotor in any adjusted position of the iioat-ing rotor, and the speed `and direction of rotation of the iloating rotor are positively maintained at the same rate and in the same direction as those of the stationary rotor, so that dental instruments secured in the rotors can drill or grind identically and on parallel axes in one or two adjacent teeth, as in providing for three-quarter crowns, in parallel slot cutting, in making parallel pin holes for pin-ledge inlays, and in rearning root canals in adjacent teeth for crowns having posts soldered together.

Another object of the invention is to provide a device of the character indicated above wherein the idler roller is free to move laterally to maintain full driving contacts with the drive and driven rotors, and has spring means for so positioning the idler roller in all of the adjusted positions of the driven roller.

A further object of the invention is to provide a device of the character indicated above wherein there is provided threaded adjusting means on the body of the handpiece which is connected to the roller detent spring for adjusting the same endwise so Vas to adjust .the driven roller toward and away from the drive roller, through an innite range of adjustments, while the device is in operation.

Other important objects and advantageous features of the invention will be apparent from the following description and the accompanying drawings, wherein, for purposes `of illustration only, a specific form of the invention is set forth in detail.

In the drawings:

FIGURE l is a side perspective view of a device of the invention;

FIGURE 2 is an enlarged top plan view of FIGURE l;

FIGURE 3 is a vertical longitudinal section taken on the line 3--3 of FIGURE 2;

FIGURE 4 is a fragmentary horizontal section taken on the line 4-4 of FIGURE 3, showing the positions of the rotors and the idler roller with the driven roller moved away from the drive roller;

FIGURE 4a is a view similar to FIGURE 4, showing the said positions when the driven roller is moved toward the drive roller;

FIGURE 6 is a fragmentary transverse vertical section taken on the line 6 6 of FIGURE 3;

FIGURE 7 is a fragmentary horizontal section taken on the line 7--7 of FIGURE 3; and

FIGURE 8 is an enlarged fragmentary vertical transverse section taken on the line 8--8 of FIGURE 3.

Referring in detail to the drawings, wherein like numerals designate like parts throughout the several views, the illustrated device comprises a longitudinally elongated, generally rectangular case 16 having forward and

rear ends

12 and 14, respectively. A longitudinally elongated and generally rectangular chamber 16 opens through the top surface 18 of the case 16, and a removable cover plate 20 is secured, as indicated at 22 upon the surface 18. A longitudinal tubular shank 24 ha-s on its forward end a boss 26 which is threaded, as indicated at 28 through the rear end of the case 10. A flexible shaft 3l) extends forwardly through the shank 24 and has a bearing 32 turning in the shank and carrying a forwardly facing crown gear 34 which extends into the rear end of the chamber 16. A portion of the shank 24 spaced rearwardly from the case 10 is threaded, as indicated at 36, for a rotary adjusting knob 38, circumposed on the shank 24 and having a peripheral groove 40 in which is sidewise and removably engaged a lateral hook 42 on the rear end of a longitudinally elongated roller detent spring 44.

The spring detent 44 extends spacedly and forwardly along the case cover plate 26, and a headed guide and pivot pin 46 threaded in the cover plate 20 and the upper surface of the case 1t) at the rear ends thereof, extends through a longitudinal slot 48 in an intermediate part of the detent 44, the slot 48 permitting pivoting of the detent 44 on the pin 46 for disengaging the hook 42 from the adjusting knob groove 40, and longitudinal `adjustments of the detent in opposite directions, by means of the knob 38.

The forward end of the detent 44 is widened to dene a flat head St) having a longitudinally elongated notch 52 in the side edge S4. Formed in the edge 54 forwardly of the notch 52, are rear :and forward

transverse slots

56 and 58, respectively. The slot 56 has positioning engagement with the groove of a dental burr, as hereinafter described for the dual purpose of holding its driving rotor in its paths of linear movements and retaining the burr in its rotating axis.

The spring detent 44 overlies the usual spring detent 60 which is pivoted on the pin 46 and has at its forward end a side slot 62 engaging in the groove 120 at the upper end of a dental burr 98 engaged in a vertical axis roller 66, which is stationarily journaled at its lower end in the bottom wall 68 of the chamber 16 and has a crown gear 7 0 which is in mesh with the crown gear 34, and is thereby driven by the cable 30.

A slot 72 is formed in the chamber bottom Wall 68 forwardly of the stationary roller 66, and is longitudinally elongated, and has a forward end '74, terminating in rearwardly spaced relation to the forward end wall 76 of the chamber 16. The forward end wall, as seen in FIGURES 4 and 5, is composed of a concave recess portion 78 in line with the roller 66 and a flat straight portion 80 at one Side of the concave portion 78.

A floating bearing or follower 82 comprises a vertically elongated block 84 having a convex forward side 86 to t the recess 78 and a concave rear side 88, and having on its upper end a forwardly offset and upstanding lug 90. The lower end 92 of the follower block 84 rests slidably upon a ledge 94 which extends along the sides and the forward end of the slot '72 on a level below the top of the bottom wall 68, as shown in FIGURE 3, with the upper end of its lug 98 rising above the'upper surface 18 of the case l0 and through the slot S8 in the detent head 50.

A ilo-ating and adjustable driven roller 96 has a tubular vertical body to accept a dental instrument, such as a burr 98, yand has thereon, on a level immediately above the upper end of the follower block 84, an annular shoulder or land 108. The upper part of the roller 96 is slidably journaled in a longitudinal slot l1011 in the cover plate 20. The upper end of the follower lug is engaged through the forward slot 58 ltherein and acts to relieve side loading between the slot 56 and the groove 126 of the related burr 9S.

It is obvious from the foregoing that lengthwise adjustment of the detent 44 by rotating the knob 38 on o a the shank 24 adjusts the detent 44 endwise and thereby moves the driven roller 96 and the forward burr 93 toward and away from the drive roller 66 in a longitudinal rectilinear path.

The

rollers

66 and 96 have circumferential bearing grooves 67v and 97 near their upper ends in which are engaged annular retainers 69 and 99 which are conned in undercuts 103 in the bottom of the cover plate 20 along the sides of the slot 101 therein.

Positioned in the chamber 16 at one side of and constantly frictionally engaging the two

rollers

66 and 96 is a vertical friction idler roller 104, preferably formed of suitable material such as nylon, and having pintles 106 on its upper and lower ends, on which are circumposed the eyes 108 at the intersections of the divergent arms 110 of V-shaped springs 112. The spring arms 1x10 terminate in curved terminals 114 which are slidably confined in upper and lower longitudinal positioning and retaining grooves 116 in the side 1118 of the chamber 16, whereby the idler roller 104 is constantly and forcibly engaged with and between the outer surfaces of the crown gear 70 on the stationary roller 66 and the land 100 on the adjustable roller 96, as shown in FIGURES 4 and 5, during all approached or distanced positions of the adjustable roller 96 relative to the stationary roller 66, so that the rollers are driven at the same speeds and in the direction with the axes of the rollers being maintained parallel to each other.

When the adjustable driven roller 96 is to be removed, the detent 44 is pivoted sidewise in order to disengage its hook 42 from the adjusting knob groove 40. This removes the rear and -

forward slots

56 and 58, from engagement with the groove of the floating burr and from the follower 82. 'I'he cover 20 when removed permits removal and replacement in the chamber 16 of the rol- 1ers and burrs.

Standard burrs 98, which as illustrated herein, have annular grooves 120 at their upper ends which are rotatably received in the

slots

56 and 62, and chordal ilats 122 at one side thereof below the grooves 120 which provide shoulders 124. The

rollers

66 and 96 have on their upper ends lateral lugs `126 which bear upon the shoulders 124 and against the flats 122 so as to lock the burrs in place in the `rollers and against rotation relative to the rollers.

Although there has been shown and described herein a preferred form of the invention, it is to be understood that the invention is not necessarily confined thereto, and that any change or changes in the structure of and in the relative arrangements of components thereof lare contemplated as being within the scope of the invention as defined by the claims appended hereto.

What is claimed is:

1. An adjustable twin dental handpiece comprising a case, a relatively stationary instrument accepting drive roller journaled in the case, driving means connected to the drive roller, a longitudinally adjustable instrument accepting driven roller rotatably and slidably mounted in the case for adjustments toward and away from the drive roller in a rectilinear path with the axes of the rollers parallel to each other and in the same plane, a floating friction idler roller mounted in the case and bearing against the drive and driven rollers and springpressed toward the drive and driven rollers, a detent mounted on the case and connected to said adjustable driven roller, and an adjusting knob mounted on the case and connected to the detent for imparting selected endwise adjusting movements to the detent and the driven roller.

2. An adjustable twin dental handpiece according to claim l, wherein said case has a tubular longitudinal shank fixed `on one end thereof, said knob being threadably circumposed on the shank, said detent having a hook on one end operatively engaged with said knob,

3. An adjustable twin dental handpiece according to claim 1, wherein a floating longitudinally movable follower is disposed in the case at the side of the driven roller remote from the drive roller and is operatively connected to said detent.

4. An adjustable twin dental handpiece Comprising a case having rear and forward ends and an upper wall, a longitudinal chamber in said case opening through said upper wall and having a chamber bottom wall, a cover plate covering the chamber opening and removably secured upon said upper wall, a headed guide and pivot pin traversing said cover plate and secured to the case, an elongated spring detent having a longitudinal slot intermediate its ends engaged on said pin, said detent having rear and forward ends, a lateral hook on the rear end of the detent and a head on the forward end of the detent, said head overlying the cover plate, an axial tubular shank having a forward end secured to the rear end of the case and having a threaded portion intermediate its ends, an adjusting nut threadably circumposed on said threaded portion -and having a peripheral groove in which said hook is sidewise and removably engaged, a rotary cable extending through said shank and terminating at its forward end in a forwardly facing crown gear journaled in the rear end of the case and exposed in said chamber, a vertical relatively stationary tubular drive roller removably journaled at its lower end in said chamber bottom wall, said chamber having rear and forward end walls, the drive roller being located near said rear end wall and having a crown gear in mesh with the cable crown gear, said detent head having a side edge formed with a rear transverse slot and a forward transverse slot, said bottom wall having therein a longitudinal slot extending forwardly from said drive roller, and said cover plate having a longitudinal slot registered with the bottom wall slot, a vertical adjustable tubular driven roller, said driven roller having a lower part journaled in said bottom slot and having an upper end extending through the cover plate slot, separate bearing means journaled on the upper ends of the drive and driven rollers and slidably confined in said cover plate slot, a floating follower in Said chamber between said driven roller and ythe forward end of the chamber and bearing against the adjacent side of the driven roller, said follower having a lower portion slidably confined in said bottom wall slot and an upstanding lug engaged in said forward transverse slot, front and rear dental burrs non-rotatably engaged through said driven and drive rollers, said burrs having upper ends rising above the rollers and provided with circumferential grooves, said rear transverse slot of the detent head being engaged in the groove of the front burr, detent means on said case having a side slot engaged with the groove of the rear burr, rotation of the adjusting knob on the shank in opposite directions serving to move said follower and said driven roller relative to the drive roller through the medium of said detent, a floating friction idler roller in said chamber at one side of and between said drive and driven rollers, said chamber having a side wall provided with vertically spaced longitudinal positioning grooves, said idler roller having pintles on its upper and lower ends, and expansion springs having eyes journaling said pintles and arms slidably confined in said positioning grooves, said springs being compressed between said side wall and the rollers and producing constant frictional engagement of the idler roller with the drive and driven rollers in all adjusted positions of the driven roller.

5. In an adjustable twin dental handpiece, a support, a stationary instrument accepting drive roller journaled on the support, an adjustable instrument accepting driven roller mounted on the support to rotate relative to and to move longitudinally toward and away from the drive roller with its axis parallel to the axis of the drive roller, a floating idler roller mounted on the support for movements longitudinally and laterally relative to the rollers, spring means acting between the support and the idler roller and holding the idler roller operatively engaged lwith and between the drive and the driven rollers, and adjusting means mounted on the support and operatively connected to the driven roller for moving the driven roller ltoward and away from the drive roller under the tension of said spring means.

6. In an adjustable twin dental handpiece, a support, a stationary instrument accepting drive roller journaled on the support, an adjustable instrument accepting driven roller mounted on the support to rotate relative to and to move longitudinally toward and away from the drive roller with its axis parallel to 4the axis of the drive roller, a iloating idler roller mounted on the support for movements longitudinally and laterally relative to the rollers, spring means acting between the support and the idler roller and holding the idler roller operatively engaged with and between the drive and the driven rollers, and adjusting means mounted on the support and operatively connected to the driven roller for moving the driven roller toward and away from the drive roller under the tension of said spring, and detent means connected to said adjusting means and to the support for holding the driven roller in an adjusted position.

7. In an adjustable twin dental handpiece, a support, a stationary instrument accepting drive roller journaled on the support, an adjustable instrument accepting driven roller mounted yon the support to rotate relative to and to move longitudinally toward and away from the drive roller with its axis parallel to the axis of the drive roller, a iloating idler roller mounted on the support for movements longitudinally and laterally relative to the rollers, spring means acting between the support and the idler roller and holding the idler roller operatively engaged with and between the drive `and the driven rollers, and adjusting means mounted on the support and operatively connected to the driven roller for moving the driven roller toward and away from the drive roller under the tension of said spring, and detent means connected -to said adjusting means and to the support for holding the driven roller in an adjusted position, `said adjusting means comprising a follower mounted on said support for longitudinal movement toward and away from the drive roller, said follower being engaged with the side of the driven roller remote from the drive roller.

8. In lan adjustable twin dental handpiece, a support, a stationary drive roller journaled on the support, an adjustable roller mounted on the support and confined to longitudinal movement toward and away from the drive roller, a follower mounted on the support and engageable with the side of the driven roller remote from the drive roller, a oating idler roller mounted on the support for full longitudinal and lateral movements relative to and located between and constantly operatively engaged with the drive and driven rollers, spring means urging the idler roller into engagement with the drive `and driven rollers, a detent having a rst end connected to the Afollower and a second end, and a knob threaded on the support with which the second end of the detent is engaged.

9. In an adjustable twin dental handpiece, a support, a stationary drive roller journaled on the support, an ad justable roller mounted on the support and confined to longitudinal movement toward and away from the drive roller, a follower mounted on the support and engageable with the side of the driven roller remote from the drive roller, a oating idler roller mounted on the support for full longitudinal and lateral movements relative to and located between and constantly operatively engaged with the drive and driven rollers, spring means urging the idler roller into engagement with the drive and driven rollers, a detent having a first end connected to the follower and a second end, and a knob threaded on the support with which the second end of the detent is engaged, means mounting said detent on the support and confining the detent to endwise movement relative to the support, said driven roller having an end journaled in said detent.

Chayes May 16, 1916 Fleischhacker Sept. 22, 1931