US3672060A - Dental instrument - Google Patents

Dental instrument Download PDF

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Publication number
US3672060A
US3672060A US842493A US3672060DA US3672060A US 3672060 A US3672060 A US 3672060A US 842493 A US842493 A US 842493A US 3672060D A US3672060D A US 3672060DA US 3672060 A US3672060 A US 3672060A
Authority
US
United States
Prior art keywords
shank
tool
clamping sleeve
sleeve
clamping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US842493A
Other languages
English (en)
Inventor
Eugen Eibofner
Willi Fink
Gerhard Farian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kaltenbach and Voigt GmbH
Original Assignee
Kaltenbach and Voigt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19681766823 external-priority patent/DE1766823C3/de
Priority claimed from DE19691927743 external-priority patent/DE1927743C3/de
Application filed by Kaltenbach and Voigt GmbH filed Critical Kaltenbach and Voigt GmbH
Application granted granted Critical
Publication of US3672060A publication Critical patent/US3672060A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A61C1/14—Tool-holders, i.e. operating tool holders, e.g. burr holders
    • A61C1/141—Tool-holders, i.e. operating tool holders, e.g. burr holders in an angled handpiece

Definitions

  • the invention relates to a dental instrument, more particularly a straight or angle handpiece, having a tool adapted to be inserted by means of a clamping sleeve made of elastic material in a hollow shank arranged in the instrument.
  • the invention has as its object to provide a dental instrument of the type mentioned initially wherein the clamping sleeve made of elastic material, without prejudicing its driving force exerted on the tool shank is subjected vto the least possible stresses by the inserted tool shank.
  • the proposed annular spaces permit the elastic material of the clamping sleeve to yield in the radial direction when the tool shank is inserted. This obviates crushing and distortion of the material, and creep. In this way the wear on the clamping sleeve is greatly reduced.
  • one or more annular spaces are provided also between clamping sleeve and tool, the clamping sleeve abutting on the hollow shank wall in the region of the annular spaces between clamping sleeve and tool shank when the tool is inserted.
  • the advantage of this form of embodiment is that the elastic material of the clamping sleeve can yield still more easily, so that the wear is further reduced.
  • the invention also proposes that the annular spaces between clamping sleeve and hollow shank and also between clamping sleeve and tool shank overlap somewhat. This construction makes it possible to completely obviate crushing effects.
  • annular space is provided between clamping sleeve and tool shank at least at the drive-side end of the clamping sleeve.
  • annular space can also be arranged between clamping sleeve and hollow shank at least at the drive-side end of the clamping sleeve.
  • the invention proposes according to a further form of embodiment that the clamping sleeve is connected nonreleasably to the tool shank. This affords the advantage that there is no need to secure the clamping sleeve against being pulled out, since the tool is pulled out with the clamping sleeve in any case when interchanging.
  • the clamping sleeve is arranged between two guide sleeves arranged in the hollow shank. This provides concentric guiding for the tool being inserted.
  • a further proposal of the invention relates to a dental instrument for rotating tools, wherein the guide sleeve remote from the free tool end is given a rotary movement and this guide sleeve is in engagement by means of a nose or the like with the clamping sleeve in order to transmit the rotary movement to the clamping sleeve. in this way the advantage is afforded that the clamping sleeve is relieved of load, since it does not have to transmit the rotary movement by means of friction.
  • the clamping sleeve therefore, can be fully used for the clamping of the tool within the elasticity limit of its material.
  • This form of embodiment is particularly advantageous for angle handpiece heads, since in the case oi these the clamping sleeve length is limited and, therefore, the frictional force for driving would possibly be too small.
  • a further form of embodiment of the invention concerning a dental instrument for rotating tools is characterized in that the clamping sleeve is screwed to the hollow shank preferably at the sleeve end directed towards the free tool end.
  • the invention also proposes that the guide sleeve situated nearest the free tool end is inserted preferably relbly in the hollow shank. This gives the advantage that, when the guide sleeve is screwed out, the clamping sleeve can be taken out if necessary, insofar as it is not connected non-releasably to the tool shank.
  • the clamping sleeve can be made from plastics material, e.g. polyamide.
  • plastics material e.g. polyamide.
  • annular spaces are also provided between clamping sleeve and tool shank and the clamping sleeve abuts on the hollow shank wall when the tool is inserted in the region of the annular spaces situated between clamping sleeve and tool, and wherein furthermore the annular spaces between clamping sleeve and hollow shank and the annular spaces between clamping sleeve and tool shank overlap somewhat in the axial direction of the clamping sleeve, therefore, it is proposed that the clamping sleeve is made of metal and, to obtain the clamping force acting radially on the tool shank, is provided with clamping tongues formed by slots, which extend in the axial direction at least partly beyond both annular space regions.
  • the construction of the metal clamping sleeve with the resilient clamping tongues has the effect that cold flow is obviated, and therefore relaxation of the clamping force of the clamping sleeve cannot take place even with exceptionally occurring continuous stressing.
  • a metal clamping sleeve which comprises in its central region a plurality of longitudinal slots distributed about the periphery, between which there are provided clamping tongues exerting a clamping force in the radial direction on the tool shank, the clamping tongues being bent inwardly.
  • this has the result that in the clamping operation the clamping force is applied substantially only in punctiform manner to the tool shank, with the result that the clamping effect is relatively slight.
  • the tool shank is subjected substantially to areal pressure.
  • the clamping tongues are conveniently defined by longitudinal slots.
  • the invention also proposes that the clamping sleeve is made of a copper alloy, e.g. copper-beryllium, bronze or the like.
  • the construction of the clamping sleeve from a copper alloy has the advantage, over a steel construction, that the elasticity and therefore the spring travels are greater, which permits more frequent stressing and thus increases the working life of the clamping sleeve, since the clamping tongues are only subjected to fatigue much later than if they are made of steel.
  • the greater spring travel relatively to steel means that e.g. for copper-beryllium a greater amount of wear on the clamping tongues on insertion and removal of tools can be permitted before the clamping force dropped below the minimum limit necessary for reliable fixing. With steel, the amount of wear which can be permitted is much smaller.
  • copper-beryllium has better sliding properties than steel, which additionally reduces wear.
  • a further form of embodiment of the invention is characterized in that, when the tool is not inserted, the outer wall of the clamping sleeve in the region of the annular spaces situated between clamping sleeve and hollow shank follows an inwardly curved course as viewed in longitudinal section.
  • This permits particularly simple production of the aforesaid annular spaces, the procedure being that into the clamping sleeve which at first still has a cylindrical, smooth external wall, but already has the internal stepped-down wall portions for fonning the annular spaces between clamping sleeve and tool shank, the tool shank or a push rod having the same diameter is pushed-in so that the external wall bulges outwards. In this state the bulging simply has to be removed again e.g. by grinding or turning, so that after the tool shank or push rod is removed the aforesaid inwardly curved outline is obtained.
  • the invention also proposes that when the tool is not inserted the internal wall of the clamping sleeve is of cylindrical shape and the transition from the wall portion forming the annular space between clamping sleeve and tool shank and the remainder of the wall portion is in the form of a bevelling permitting the complete insertion of the tool shank.
  • the invention proposes that the ends of the longitudinal slots are rounded, expediently in the form of a widening. This avoids or reduces the notching stresses which occur in the case of angularly shaped slot ends.
  • FIG. I is a sectional view showing a dental instrument, constructed as a tool holder e.g. for a mirror not shown here, with a clamping sleeve of elastic material,
  • FIG. 2 is a sectional view showing an angle handpiece head of a dental instrument, constructed as a turbine angle handpiece, with clamping sleeve of elastic material,
  • FIG. 3 is a sectional view showing a detail modified relatively to FIG. 2,
  • FIG. 4 shows the form of embodiment according to FIG. 2 with inserted tool constructed as a drill, in sectional view,
  • FIG. 5 is a sectional view showing a dental instrument constructed as a straight turbine handpiece, with clamping sleeve made of elastic material,
  • FIG. 6 shows the form of embodiment according to FIG. 5 with inserted tool shank
  • FIG. 7 is a sectional view showing an angle handpiece head of a dental instrument constructed as a turbine angle handpiece, the clamping sleeve of elastic material being made of metal and provided with longitudinal slots,
  • FIG. 8 is a sectional view showing a form of embodiment of the clamping sleeve modified relatively to FIG. 7 and FIG. 9 shows the clamping sleeve according to FIG. 8 with the tool shank inserted.
  • the dental instrument constructed as a tool holder is designated as I.
  • the tool holder At its lower end the tool holder is constructed as a hollow shank.
  • a clamping sleeve 3 of elastic material into which there can be inserted the shank of a dental tool e.g. the shank of a mouth mirror.
  • the elastic clamping sleeve 3 is inserted in the hollow shank 2.
  • the screw slot 4 is provided for this purpose.
  • annular space 5 Between the clamping sleeve 3 and the wall of the hollow shank 2 there is situated an annular space 5.
  • the elastic material of the clamping sleeve can yield into the annular space 5, so that a satisfactory fixing of the tool shank is possible without the risk of detrimentally affecting the elastic material.
  • the tool holder 1 is of hollow construction internally, staning from the hollow shank 2, so that the inserted tool can, if necessary, be pushed-out through the duct 2 thus formed by means of a thin rod or the like.
  • FIG. 2 shows an angle handpiece head of a dental instrument constructed as a turbine angle handpiece.
  • the rotor 7, which is provided with a bore and is thus constructed as a hollow shaft is provided with turbine blades 8 and is mounted in the usual way by means of ball bearings 9 in the angle handpiece head.
  • the air is supplied to the turbine through an air duct (not shown) passing through the shank 10 of the angle handpiece head, whereas the outgoing air can also be discharged in any desired manner.
  • a water supply duct 11 from which a conduit 12 leads to a spray chamber 13 through which by means of small spray tubes 14 spray water can be discharged on to the region of the tooth being treated, or on to the tool point.
  • the clamping sleeve 3 Inserted in the rotor 7, which is constructed as a hollow shaft, is the clamping sleeve 3 which is made of elastic material, and guide sleeves 15, 16 are situated at the two ends of the clamping sleeves 3 and are inserted in the rotor 7 so as to be rotationally rigid eg with a snug fit.
  • the upper guide sleeve is provided with noses I8 which are in engagement with appropriate recesses 19 of the clamping sleeve 3, whereby the rotary movement of the rotor 7 is transmitted to the clamping sleeve.
  • the lower guide sleeve 15 is screwed into the hollow of the rotor, for easier interchanging.
  • the screwthread is designated as 20.
  • FIG. 4 shows the form of embodiment according to FIG. 2 with the inserted tool 21, which is constructed as a drill.
  • the tool shank is designated as 22.
  • the central annular chamber 5 and also the annular chambers 6 situated at the two ends of the clamping sleeve 3 have become narrower, the cause of this being that the elastic material of the clamping sleeve 3 has yielded when the tool shank 22 was inserted. This prevents crushing, distortion or creep in the material and therefore obviates wear thereon.
  • the drawing also shows that the annular spaces 5 and 6 overlap somewhat, thus further improving the aforesaid advantages.
  • FIG. 5 which shows a dental hand instrument constructed as a straight turbine-handpiece
  • the clamping sleeve 3 is screwed into the hollow shaft 23 at its lower end at 28, as in the fonn of embodiment according to FIG. 1.
  • a screw slot which is designated as 24.
  • Suitable ball bearings or other bearings which will not be described in detail here, are provided in known manner for mounting the shaft 23.
  • 26 designates the connection for the driving air for the turbine rotor 25.
  • a known ejecting device given the general reference numeral 27 is used for ejecting a tool (not shown) inserted in the clamping sleeve 3.
  • Rotary movement is transmitted from the hollow shaft 23 to the clamping sleeve 3 by the aforesaid screwed connection 28.
  • FIG. 6 shows the same handpiece as in FIG. 5 but with the tool shank 22 inserted.
  • Rotary movement is transmitted from the hollow shaft 23 to the clamping sleeve 3 by friction.
  • the clamping sleeve 3 is so opened-out on the tool shank 22 that the two ends of the clamping sleeve securely surround the portion of the tool shank 22 which at this region is slightly recessed.
  • Long annular spaces 5 are situated in the central portion of the clamping sleeve. When the tool is removed, the clamping sleeve also comes out of the hollow shaft together with the tool shank 22.
  • the internal wall of the metal clamping sleeve 3 is constituted by three cylindrical individual portions 29, 30 and 31, of which the outer portions 29 and 31 have a somewhat wider diameter than the internal portion 30.
  • the external portions 29 and 31 serve to form annular spaces 6 between the clamping sleeve 3 and the tool shank 21 whereas, as FIG. 9 shows more particularly, the internal portion 30 having substantially areal contact with the tool shank 22 when the tool is inserted.
  • the clamping sleeve 3 is also so constructed that between the clamping sleeve and the rotor 7'there is formed a further annular space 5 (FIG. 7) which is present at least whenthe tool is not inserted.
  • the internal diameter of the clamping sleeve 3 in the region of these annular spaces 5 is smaller than the diameter of the tool shank at least when the tool is not inserted.
  • FIGS. 7 to 9 also show, the annular spaces 6 on the one hand and 5 on the other hand overlap here also.
  • the metal clamping sleeve 3 comprises clamping tongues 33 which are formed by slots 32, in order to obtain the clamping force acting in the radial direction, and which extend axially beyond the regions of both the annular spaces'6 and the annular space 5.
  • the external wall of the clamping sleeve 3 when the tool is not inserted is curved inwards in the region of the annular space 5 as viewed in longitudinal section.
  • FIG. 7 shows that the internal wall of the clamping sleeve 3 is cylindrical in configuration when the tool is not inserted, the transition from the wall portions 29', 31 defining the annular spaces 6 between clamping sleeve 3 and tool shank to the other wall portion 30 being in the form of a bevelling 35.
  • bevelling permits complete insertion of the tool shank 22 in a simple manner, i.e., without the transition forming an obstacle to the instrument side tool shank end, more particularly if the said end is not rounded or bevelled but is flat.
  • a chuck device adapted to hold for rotation a dental tool and having a tool-receiving hollow shank, said shank having a tool-extemal end and an end remote therefrom, a tool clamping sleeve of elastic material fixed within said shank, said sleeve having at least one external circumferential surface area of less diameter than the internal diameter of the confronting surface area of said shank and at least one internal circumferential surface area (a) of diameter smaller with relation to the remaining internal circumferential surface thereof, (b) smaller than the diameter of an inserted tool and (c) of greater thickness than in said external circumferential surface area extending axially beyond said internal circumferential surface area to provide annular spaces formed by said surface areas into which said sleeve may expand in response to toolapplied pressure, said surface areas of said sleeve are in axially overlapping relation with said internal circumferential surface area being positioned axially wholely within the axial length of said external circumferential surface area.
  • said internal surface area of said sleeve being located in radially opposite relation to said end of said shank.
  • a dental instrument as defined in claim ll including a guide sleeve disposed within said shank at each said end, said clamping sleeve being disposed axially between said guide sleeves.
  • each of said slots having end portions of greater width than the intermediate portions thereof.

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
US842493A 1968-07-24 1969-07-17 Dental instrument Expired - Lifetime US3672060A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19681766823 DE1766823C3 (de) 1968-07-24 1968-07-24 Zahnärztliches Instrument, insbesondere Hand- oder Winkelstück
DE19691927743 DE1927743C3 (de) 1969-05-30 1969-05-30 Zahnärztliches Instrument, insbesondere Hand- oder Winkelstück

Publications (1)

Publication Number Publication Date
US3672060A true US3672060A (en) 1972-06-27

Family

ID=25755445

Family Applications (1)

Application Number Title Priority Date Filing Date
US842493A Expired - Lifetime US3672060A (en) 1968-07-24 1969-07-17 Dental instrument

Country Status (4)

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US (1) US3672060A (enrdf_load_stackoverflow)
AT (1) AT296494B (enrdf_load_stackoverflow)
FR (1) FR2013607A1 (enrdf_load_stackoverflow)
GB (1) GB1258951A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156547A (en) * 1990-11-15 1992-10-20 Young Dental Manufacturing Company Disposable prophylaxis angle and method of assembling
US5328369A (en) * 1990-11-15 1994-07-12 Young Dental Manufacturing Company Dental prophylaxis angle
USRE34997E (en) * 1992-07-28 1995-07-18 David Kraenzle Dental appliance
US5531599A (en) * 1990-11-15 1996-07-02 Young Dental Manufacturing Company, Inc. Disposable dental prophylaxis contra-angle, method of making it, and drive gear for use therein
US5591028A (en) * 1993-12-28 1997-01-07 J. Morita Manufacturing Corporation Dental cutting tool holder
US5688122A (en) * 1994-08-01 1997-11-18 Dentalwerk Burmoos Gesellschaft M.B.H. Chucking device for a dental tool
US6203322B1 (en) 1999-04-15 2001-03-20 David Kraenzle Dental prophylaxis angle
US20040251640A1 (en) * 2003-06-12 2004-12-16 W&H Dentalwerk Burmoos Gmbh Chuck device
US20060024643A1 (en) * 2004-07-28 2006-02-02 Bruno Hofer Medical handpiece having a clamping sleeve for a tool
ITMI20110992A1 (it) * 2011-05-31 2012-12-01 Cucchi Pietro Spa Pinza perfezionata per l'afferramento di barre in un caricatore per torni
EP0920839B2 (de) † 1997-12-02 2012-12-19 Kaltenbach & Voigt GmbH Motorhandstück
US20150037751A1 (en) * 2012-02-20 2015-02-05 Gc Corporation Image acquisition device for dental handpiece, imaging apparatusf or dental handpiece, dental handpiece and dental handpiece system
US20150064648A1 (en) * 2012-03-30 2015-03-05 Sirona Dental Systems Gmbh Dental handpiece having a rolling bearing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3094338A (en) * 1960-12-23 1963-06-18 Richard W Page Chuck
US3248138A (en) * 1962-10-19 1966-04-26 James W Bradbury Method of and means for connecting two elements in driving relationship
US3321209A (en) * 1964-08-20 1967-05-23 Ronald D Sanders Dental handpiece chuck
US3324553A (en) * 1957-08-20 1967-06-13 John V Borden Dental handpiece
US3408043A (en) * 1967-04-03 1968-10-29 Power Brake Equipment Company Pneumatic motor
US3426429A (en) * 1965-03-23 1969-02-11 Erich Hoffmeister Chuck means for dental hand piece

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324553A (en) * 1957-08-20 1967-06-13 John V Borden Dental handpiece
US3094338A (en) * 1960-12-23 1963-06-18 Richard W Page Chuck
US3248138A (en) * 1962-10-19 1966-04-26 James W Bradbury Method of and means for connecting two elements in driving relationship
US3321209A (en) * 1964-08-20 1967-05-23 Ronald D Sanders Dental handpiece chuck
US3426429A (en) * 1965-03-23 1969-02-11 Erich Hoffmeister Chuck means for dental hand piece
US3408043A (en) * 1967-04-03 1968-10-29 Power Brake Equipment Company Pneumatic motor

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5749728A (en) * 1990-11-15 1998-05-12 Young Dental Manufacturing Company Method of assembling a dental prophylaxis angle
US5423679A (en) * 1990-11-15 1995-06-13 Young Dental Manufacturing Company Dental prophylaxis angle
US5503555A (en) * 1990-11-15 1996-04-02 Young Dental Manufacturing Company Dental prophylaxis angle
US5531599A (en) * 1990-11-15 1996-07-02 Young Dental Manufacturing Company, Inc. Disposable dental prophylaxis contra-angle, method of making it, and drive gear for use therein
US5328369A (en) * 1990-11-15 1994-07-12 Young Dental Manufacturing Company Dental prophylaxis angle
US5156547A (en) * 1990-11-15 1992-10-20 Young Dental Manufacturing Company Disposable prophylaxis angle and method of assembling
USRE34997E (en) * 1992-07-28 1995-07-18 David Kraenzle Dental appliance
US5591028A (en) * 1993-12-28 1997-01-07 J. Morita Manufacturing Corporation Dental cutting tool holder
US5688122A (en) * 1994-08-01 1997-11-18 Dentalwerk Burmoos Gesellschaft M.B.H. Chucking device for a dental tool
EP0920839B2 (de) † 1997-12-02 2012-12-19 Kaltenbach & Voigt GmbH Motorhandstück
US6203322B1 (en) 1999-04-15 2001-03-20 David Kraenzle Dental prophylaxis angle
US20040251640A1 (en) * 2003-06-12 2004-12-16 W&H Dentalwerk Burmoos Gmbh Chuck device
US7416411B2 (en) * 2004-07-28 2008-08-26 Kaltenbach & Voigt Gmbh Medical handpiece having a clamping sleeve for a tool
US20060024643A1 (en) * 2004-07-28 2006-02-02 Bruno Hofer Medical handpiece having a clamping sleeve for a tool
ITMI20110992A1 (it) * 2011-05-31 2012-12-01 Cucchi Pietro Spa Pinza perfezionata per l'afferramento di barre in un caricatore per torni
EP2529862A1 (en) * 2011-05-31 2012-12-05 Pietro Cucchi S.p.A. Feed collet for clamping a bar in a loader for automatic lathes
US20150037751A1 (en) * 2012-02-20 2015-02-05 Gc Corporation Image acquisition device for dental handpiece, imaging apparatusf or dental handpiece, dental handpiece and dental handpiece system
US20150064648A1 (en) * 2012-03-30 2015-03-05 Sirona Dental Systems Gmbh Dental handpiece having a rolling bearing

Also Published As

Publication number Publication date
GB1258951A (enrdf_load_stackoverflow) 1972-01-05
AT296494B (de) 1972-02-10
FR2013607A1 (enrdf_load_stackoverflow) 1970-04-03

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