US 2005849 A
Description (OCR text may contain errors)
June 25, 1935. p, R, SK|NNER j 2,005,849
ANGLE DENTAL HANDPIECE 'Filed July 6, 1935 ATTORNEY Patented June 25, 1935 v UNITED STATES PATENT OFFICE 'i v ANGLE DENTAL HANDPIECE Perry R. Skinner, Amsterdam,N. Y. Y Appuaaim July 6, 1938, serial No; 679,248 'Y 7 claims.A (c1. svt- 27) This invention relates-to means for detachably.
securing a tool in operative position inl an angle;
tial groove in the rotating tool, or otherwise en.
gages the tool. Consequently, after anyconsiders able use, the. securingmeans becomes worn by reason of frictional Contact with the tool, thetool 15? is less rigidly held, and finallyl theseouring means becomes inoperative. Anyloosening of the tool in its holder allows of more orless wabbling of the tooland impairs its effectiveness, and frequently in practice, because of thewearing out of the. attaching means, a tool is released in the mouth of a patientbeing operatedv upon, and there isdanger of lthe tool lodging in the throat. of the patient or of being swall owed.
One object of thepresentinvention.is yto pro.- vide means for-detachably securing a tool an angle dental zhandpiece, wherebywhen in .use .the
tool is directly secured to the driving means by which Vthe tool operated, dispensing with any intermediate device upon which friction isirn- 1 posed. Further-objects .areto provide .attaching means of the kind .described vin which a tool may be either secured 0.1' released by easy and rapid manipulation of .the Aparts employed, 'and which is vadapted for use in: connection. with-.tools 351. having the standard .form ois Another .object is. to. provide means in which thepower applied-to rotate a tool, operatively located in a handpiece, shall be utile ized rto insure :z toolr against possibility of removal during such rotation.
.The invention resides. .in Jthe.generically an specicallv novel .features 'of construction `'and relative arrangement of. `coacti'ng `Aparts substantially as hereinaIterKdes-cribed andclaimed. 45 Thepresent illustration of theV invention shows one embodiment thereof, and anu-nderstanding of the principles of operation involved will make it clear that the forms and aggroupments ci the elements .employed mayfvwidely "be varied without .departing from the. scope of inherent novelty. I
In ,thedrawing; v VFigure 1 isa centr-e1 vertieaI sectional View of the head of angle dental'handpiece, construct 5r .ed .in .accordance with .the invention, a toolfbeing ,tophettehine' shown introduced and in position to be attached and retained by the rotation of the securing'- means. g
Figure 2 is a top plan view o f the handpiece. Figure 3 is a, sideviewof a dental tool having a 5 shank of standard form- Figure 4 is e side view of. a rotatable' sleeve by which the tool-holding member of the vdev-ine is received and driven, the wall of the sleeveA being broken. @Wav Vto show a projection by which the 10 tool-holding Amember engaged, and Whith is adapted to secure a tool operative positions Figure 5 is a sideview of the tool-receiving membet Figure 6 is a transverse sectional view of the 151 tool-holding member, the section 'being takenon the line 6 6 in Figure 5. Y j y Figure l is a transverse sectional viewv taken on the line l-l' of Figure l. f Y Y In the form of the invention herein illustrated, 2O the head or the angle dental handpiece is shown as consisting of a shell composed oftwo separa.- ble parts 1y and 2, each provided with an exterf nally i screw threaded extension 3 (showrr by dotted lines in Figure Yl), which extensionsiare 2 received byand-normally held in the interiorly` screw threaded portion 4 of a shaft casing. `By this construction ready separation ofthe parts to allow access to .the interior of` the head for purposes of repair, removal and substitution'of 30 parts, oiling, sterilizing, etc., lis provided for. i
Mounted in the head of Ythe handpiece isy a rotatable ksleeve Y5 which ingeneral form corresponds to those commonly employed in similar struc-, tures, The `sleeve has on it a beveledgpal' with which meshes a. beveled pinion l on" the .endof a shaft 8 and'bv which rotation 0i the. sleeveand parts. connected is effected The shaft 8 .driven `in any suitable way, as by the usual viiexible aft employed in this connection. Extending front-th '40 y,
inner face of the sleeveffi's a projectionf, one function of which is to engage a tool-receiving member l@ and cause such member to rotate in unison with the sleeve. The member I0, which is tubular-in general 45 contour and .of a size to -t closely in the'sleeve 5, has in it a lug or projection Il, which engages a flattened portion .of the shank VYQ .atopl tobe receivedapd driven-bythe handelsce- -The niember has formed-:in it e trensverseslpt I Zfwhicli is 0v intersected by a slot I3 which extends to .the end of the member Ill. A. i
.In assembling .the parts the member ,i s intro: duced in position totalise the proieptipn of! the sleeve .5to pass throuehptheslbt l?, andepeeee te closed at its upper end vby a cap I5 having a part-,connected with the driving mechanism, toY
resilient extension I6, which latter is attached to the outer face of the head by ascrew I'I. v
The novel parts of the handpiecawhile capable of easy modification to adapt them for use in con- `nection with any form of Vtool shank, are par-,k ticularly adapted foruse with what is recognizedA in the art as the standard form of this part. Theshank, as shown in Figure 3, has near one enda recess of flattened portion Ito be engaged by a rotate the shank, and with a circumferential groove I9 to be entered by a member by which the shankis prevented from `removal during the time the tool, of which the shank is a part, is in use.
Inasniuch as during the use of a handpiece of thekind described the driven sleeve 5 and the tool-receiving member Il) are constantly rotated in contact with portions of the instrument by which they are heldin position, the consequent ultimate' wear of contacting parts lessens or destroys the usefulness of handpieces, as ordinarily constructed. When the parts become` worn, even slightly, wabbling of an attached tool ensues, rendering satisfactory operation impossible. In order to compensate for and to adapt the instrument tov take up such wear of parts, the principal elements of the handpiece are given novel forms in order that adjustable cone bearings atthe main contacting points may be provided. '.Ihe end, which may be termed the lower end, ofthe tool-receiving member. I is formed with a hollow head or enlargement 20 which is cupshaped in general contour, vand inpwhich the inner face of the wall is inclined. The lower end 2I of the sleeve 5, which,v when ythe parts are assembled,'bears on the inclined face of the cup -20, is beveled to correspond to the inner contour of the cap. A cone bearing is furnished at the upper end ofthe tool-receiving member, by providing the inner face of thercap I5 with a coneshaped projection 22 which enters and bears upon the upper end ofthe ring or collar I4. Any
wear which may occur can readily be ytaken up by turning the ring orr collar to raise it the required extent. f
In assembling the voperative elements of the handpiece the parts I, 2 of the head are separated and the cylinder 5 is introduced into'the lower section .of the head with the bevel gear 6 in engagement with the pinion 1. The tool-receiving member I0 is then passed upwardlyinto the cylinder. As the member Ill is introduced itis turned to cause the portion I3 of the slot in its upper end to register with the projection 9 of the cylinder 5. The member is then pushed up- Wardly until theprojection is in line with the portions. The lupper portion of f the head is then n placed in position, and theparts o f the head are secured inplace by screwing their screw threaded extension's into the shaft casing 4, When the parts are so placed the projection 22 of the cap bears upon the ring or collar I4.
'I'he relative arrangement of the parts is such that when rotation is imparted to the cylinder 5 the tool-receiving member is positively driven by reason of the contact of the projection 9 of the cylinder 5 with the end of the slot I2. Consequently, when the shank of a tool is introduced into the tool-receiving member, and the lug Il of the member enters the indentation I8- of the shank, thertool is Vpositively driven, there being employed no intermediate connecting means involving frictional, spring or other unreliable features between the initial driving means and the tool shank.
So far as I am aware, it is novel, in organizations of the character herein described, to vutilize by practicable, easily assembled parts theforce exerted to rotate a tool, for the purpose of maintaining a tool in attached operative position. I have herein shownl and described one form and'disposition of parts to accomplish the purpose; but," of course, I am not limited in this respect. When the described parts are employed, and the shank of a tool is introduced to bring its indentation I8 to a position to receive the lug II of the toolreceiving member, the, circumferential groove I9 of the tool shank is in line with the portion I2 of the slot in the tool-receiving member. Thus, assuming that the parts are in their'proper initial relative positions, with the projection 9 of the cylinder 5 extending into the portion I2 of the slot in the tool-receiving member, and in line withI and at the same time to enter andtravel a short distance in the groove I9 of the shank of the tool. When the parts are disposed-as described not only will the tool be positively driven, but the force exerted to drive the tool effects and maintains a rigid locking in place of thetool continuously during its operation. Y 'I'he advantages Aof these two attainments will be lapparent toany oneV who is familiar with the essential requirementsV of a positive driving of a tool, and of holding means, incapable of release, Vfor maintaining'a tool in place during use. l V Release and removal of a tool, when the driving power is cut oiis easily accomplished by applying slight pressure to the cap I5, holding the toolreceiving member against rotation, and by turning the head and the cylinder 5 to its initial pos1 tion with the projection 9 in line with the portion I3 of the slot in the cylinder. In this position, the projection is removed from the groove I9 of the tool shank and in linewith the indentationV I8 of the tool, permitting freelwithdrawal fof v`the latter, YIclaim: L v. v
1. A dental handpiece comprising arotatable sleeve, a tool-receiving member, means'for causing a tool to rotate with the member, and means whereby the tool receiving member is caused to rotate with the sleeve and a tool is engaged and prevented from withdrawal from the tool-receivl ing member. y
2. A dental handpiece comprising a rotatable tool-receiving member having an interior lug adapted to engage a tool, and cause the latter 'to' rotate in unison with the member, the tool receivingmember being providedwith a transverse slot. a driven sleeve receiving the tool-receiving member, and provided with a projection Yentering and adapted to engage the end of the slot, and to engage and prevent the withdrawal of a tool.
3. A dental handpiece comprising a rotatable tool-receiving member, a lug extending from the member and adapted to engage a tool and cause it to rotate with the member, the tool-receiving member being provided with a transverse slot, and driving means including a projection adapted both to enter and engage an end thereof, and to engage and prevent the withdrawal of a tool.
4. A dental handpiece comprising a rotatable tool-receiving member having a transverse slot and a slot intersecting the transverse slot and ex tending to the end of the member, and driving means including a projection adapted to. be passed through the intersecting slot to the transverse slot, to engage the end of the latter, and to engage and prevent the Withdrawal of a tool located in the member.
5. A dental handpiece comprising a rotatable tool-receiving memben'means for positively causing a tool'to rotate with the member, the member being provided with a transverse'slot and with a slot intersecting the transverse slot and extending to the end of the member, and driving means including a projection adapted to enter the transverse slot'and engage an end thereof, and to engage and prevent the Withdrawal of a tool located in the member.
6. A dental handpiece comprising a head, a rotatable sleeve having` a tapering end arranged in the head, a hollow tool-receiving member located in the sleeve and having a cup-shaped end having an inclined inner face, receiving the tapering end of the sleeve, and a cap attached to the head and having a cone-shaped extension entering and bearing on the end of the tool-receiving member.
7. A dental handpiece comprising a head, a rotatable sleeve having a tapering end arranged in the head, a hollow tool-receiving member located in the sleeve and having an adjustable ring at one end thereof, the other end being cup-shaped and having an inclined inner face, receiving the tapering end of the sleeve, and a cap attached to the head and having a cone-shaped extension entering and bearing on the adjustable ring. y
PERRY R. SKINNER.