Classifications

• • 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
  • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
  • A61C1/07—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with vibratory drive, e.g. ultrasonic
• • 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
• • 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
  • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
  • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
  • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
  • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
  • B23K20/106—Features related to sonotrodes

Definitions

• the invention relates to an elastically bendable coupling body for high frequency implements according to the preamble of claim 1.
• High-frequency should be understood in the claims and the description of a frequency which is from a few kHz to 40 and more kHz. For common dental applications, it may preferably be in the range of 15 kHz to 25 kHz.
• a high-frequency equipment for dental purposes is described in DE 42 38 384 Al. It comprises an ultrasound drive unit, which comprises a stretched stack of piezoelectric disks arranged behind one another. This disk stack is accommodated in a handle of the work tool.
• the coupling body is designed as a ring oscillator having four circumferentially equally distributed vibration maxima. One of the oscillation maxima is connected to the ultrasonic drive unit, a vibration maximum offset by 90 ° with the tool. This thus performs a movement whose direction is tilted by 90 ° to the direction of the output movement of the ultrasonic drive unit.
• Working tools of the type mentioned above are used in particular in the dental field to clean tooth surfaces or also to produce cavities in teeth.
• the coupling body must have relatively small dimensions to a dentist even under the crowded conditions in the mouth of a patient good View of the respective job.
• the small-diameter annular coupling - body according to the prior art only work reliably if they are worked with great precision and are made of special, expensive materials. If these conditions are not met, it may cause breaks in the coupling body and thus to a failure of the implement.
• a coupling body according to the preamble of claim 1 is to be developed so that it can be made easier and less prone to material fractures.
• the excitation of the natural vibrations takes place in that a torque is applied to a predetermined point of the bending arms. This is generated by a force acting on the driven flexure arm (s) under a lever arm.
• the development of the invention according to claim 3 is in terms of symmetrical vibration conditions and symmetrical loads of the driven bending arm / driven bending arms of advantage.
• a coupling body according to claim 5 has two bending arms with mounted in the same direction acting as a mass body drive body whose centers are each removed from the neutral fiber of the bending arm carrying them. If the bending arms are acted upon in the longitudinal direction with force, then the drive at a distance acting as a mass body drive body then due to their inertia to the same direction bends of the two bending arms.
• a coupling body according to claim 2 can thus be regarded as a frame with bendable parallel sides, which carry at a distance from the frame edges patch acting as a mass body drive body.
• the coupling body thus forms an elastically deformable parallelogram linkage with attached mass bodies acting as drive bodies, which lead to a high-frequency upset body. coined linear change input movement is converted into a tilted substantially linear change output movement of the same frequency.
• a coupling body according to claim 7 one can profit for the mass moment of inertia generated by the one of the drive body of the transverse dimension of the frame spanned by the various arms.
• the mass of a drive body can therefore be chosen slightly smaller.
• the torques exerted on the bending arms by the drive bodies acting as mass bodies, when the frame formed by bending arms and connecting arms is accelerated, can be adjusted despite different masses of the drive bodies.
• the development of the invention according to claim 10 is advantageous in terms of smooth boundary surfaces of the coupling body.
• a coupling body according to claim 11 is characterized in that accelerations of the frame formed by bending arms and connecting arms in the direction of Biegearmachsen are particularly effectively implemented in bending vibrations.
• the development of the invention according to claim 13 is in view of a strong generation of bending vibrations of advantage.
• the output movements derived therefrom are correspondingly strong in the direction of the tool axis, which are provided by the tool-side connecting arm.
• Claim 14 indicates a particularly simple and zuveher possibility of the connection of sonotrode and coupling body.
• a coupling body according to claim 15 allows the unit formed by coupling body and Sonotrodenabstriebsende builds particularly short in the direction perpendicular to the frame plane direction.
• the development according to claim 16 also serves for a uniform distribution of the mechanical loads on both bending arms.
• the geometry assumed in the force-free state is a rectangle.
• the deflections of the bending arms take place symmetrically on both sides of the rectangular edges formed by them, whereby a remainder parallel to the input movement is generated.
• wegungskomponente which remains at greater deflection of the bending arms, can be kept very small, or at small deflections, as they are of interest, virtually zero.
• the mass body and the connecting arms can lie substantially in a same plane without the drive body located inside the frame obstructing the deformation of the frame. As a result, one can produce a coupling body starting from a plane-parallel blank in a simple manner.
• a simple and loadable connection of the coupling body with the drive unit is obtained.
• the latter can z. B. be formed simply by an ultrasonic generator or by an ultrasonic generator with downstream sonotrote.
• the development of the invention according to claim 26 is of a how the manufacturability of the coupling body from a plane-parallel blank advantageous.
• the rectangular prismatic basic geometry of the bending arm allows precise prediction of oscillation frequencies.
• the bending modes are precisely defined by the rectangular shape: the vibrations induced in the bending arms are largely free of torsions with respect to the longitudinal axis of the bending arm.
• the development of the invention according to claim 29 is in view of compact construction of the coupling body and a handpiece containing it in the vicinity of the job advantage. This facilitates the
• a coupling body according to claim 30 is characterized by a particularly long service life.
• FIG. 1 a side view of a dental ultrasonic handpiece, in which the various main components of the handpiece are schematically indicated; tet are;
• FIG. 2 shows a side view of a coupling body that can be used in an ultrasound handpiece according to FIG. 1;
• FIG. 3 shows a schematic view of the coupling body according to FIG. 2 in a movement phase in which a pulling force directed to the right in the drawing is exerted on the coupling body;
• Figure 4 is a view similar to Figure 3, but with a coupling force in the drawing to the left directed pressing force is applied;
• Figure 5 is a perspective view of a practical embodiment of a coupling body for a working device according to Figure 1;
• FIG. 6 shows a longitudinal section through the coupling body according to FIG. 6;
• FIG. 7 shows a perspective view of a further modified coupling body
• FIG. 8 shows a middle section through the coupling body according to FIG. 7 together with the output end of a sonotrode
• Figure 9 is a view similar to Figure 7, in which a further modified coupling body is reproduced.
• a total of 10 denotes an ultrasonic handpiece which serves to drive a tool 12.
• the tool 12 may be, for example, a lancet-shaped flat tool with which the side surfaces of a tooth are to be processed.
• the tool 12 moves in the direction of the arrow 14 indicated in the drawing while working with the tool 12 is directed to this through a nozzle 16, a jet 18 of a working fluid containing a suspended in water abrasive medium.
• the amplitude of which lies at a few ⁇ m to 100 ⁇ m serves as an ultrasonic generator 20, which is accommodated inside a handle 22 of the handpiece 10.
• the ultrasonic generator 20 comprises a plurality of piezoelectric disks stacked one behind the other in the axial direction and is located on its in
• Figure 1 left output end connected to a sonotrode 24.
• the latter serves to concentrate the ultrasonic energy by means of "funnel effect" and to provide a correspondingly increased amplitude of movement at the output.
• the end of the sonotrode 24 is connected to a coupling body 26. This is the directed in the axial direction of the handle 22, in the drawing horizontal output movement of the sonotrode 24 in a direction perpendicular to the axis of the handle 22, in the drawing vertical movement of the tool 12.
• FIG. 2 shows a schematic structure of the coupling body 26. It has two flexures of equal length which are parallel to one another. arms 28, 30, each having a rectangular cross section, wherein the long side of the cross section is perpendicular to the plane of Figure 2. The ends of the bending arms 28, 30 are closed by connecting arms 32, 34 to form a rectangular frame 36, the inner edge of which has quarter-circular rounded portions 38 at the corners.
• the connecting arms 32, 34 are perpendicular to the plane of Figure 2 have the same dimensions as the bending arms 28, 30, but have a width B, which is significantly greater than the width b of the bending arms.
• the otherwise shorter connecting arms 32, 34 can therefore be regarded as essentially rigid with respect to the bending arms 28, 30.
• the connecting arms 32, 34 carry at their center identical acting as a mass body drive body 40, 42, the centers of gravity by the same distance D upwards from the neutral fibers of the bending arms 28, 30 are removed.
• the drive bodies 40, 42 likewise have the same dimension perpendicular to the drawing plane of FIG. 2 as the bending arms 28, 30 and the connecting arms 32, 34.
• the entire coupling body 26 can thus be produced by sawing out a plane-parallel blank.
• Acting as a mass body drive body 40, 42 have substantially the shape of axially short cylinder and are connected via transition sections 44, 46 with the adjacent connecting arms 32, 34.
• transition sections 44, 46 are connected at their two sides in each case via rounded portions 48, 50 with the bending arms 28, 30.
• FIGS. 3 and 4 show how the coupling body deforms when a rightward pulling force or a pushing force directed to the left is exerted on the connecting arm 34 located on the right in the drawing.
• the coupling body 26 thus one on the right-hand driven connecting arm 34 exerted alternating movement, which takes place in the axis of the sonotrode 24 and thus in the axis of the ultrasonic generator 20 and the handle 22) converts into a tool movement perpendicular to the axis of the sonotrode 24 and thus to that of the handle 22nd he follows.
• FIGS 5 and 6 show a practical embodiment of a coupling body 26.
• Parts of the coupling body 26, which correspond functionally already above with reference to Figures 2 to 4 corresponding parts are again provided with the same reference numerals and do not need in their basic properties to be described again in detail.
• the coupling body 26 according to FIG. 5 can be produced from a plane-parallel blank by making two elongated holes in it in the region of the bending arms 28, 30 which are each terminated at their ends by a semi-cylindrical surface 48. In the remaining between the two Langl ⁇ chern web then a slot 52 is milled, whereby one receives a lower drive body base 40.
• a connecting head 54 which has a threaded bore 56 which opens to the right and into which a threaded end section of the sonotrode 24 can be screwed, is integrally formed on the connecting arm 34 on the right of the coupling body.
• An upper boundary surface of the connecting head 54 and a lower boundary surface of this connecting head are placed so that the center in the connecting head bore 56 is located approximately at the level of the upper bending arm 30.
• the transition surfaces of these upper and lower boundary surface to the actual coupling body are curved, as indicated at 58 and 60 in the drawing.
• the edges of the connecting head 54 are broken by chamfers 62.
• the left in Figure 5 located end portion of the coupling body 26 has a central vertical slot 64, which leads to a vertical bore 66.
• the outside of the connecting arms 32, 34 are each provided symmetrically with respect to the longitudinal center plane with a chamfer 68, so that clamping sections 70, 72 of the left-hand link arm 34 are obtained.
• an axially slotted receiving sleeve 74 is used in.
• the connecting arm 32 in which the shank of a tool can be used.
• the clamping portions 70, 72 can be moved against each other against their spring force aufein-, to clamp the shaft of a tool firmly in the receiving sleeve 74.
• the upper drive body 42 has a central vertical slot 78 which is open towards its upper end face and in the bottom of which a through-bore 80 is provided. The latter is aligned with a mounting hole 82 in the drive body base 40.
• the shaft of a ground rod 84 is firmly inserted (welded), which extends under toilchem game through the through hole 80 and the slot 78 so that the ground bar 84 does not abut laterally under Ultrachallbeetzschlagung the coupling body 26.
• the end face of the ground bar 84 and the top of the drive body 42 are substantially coplanar.
• the geometry and mass of the drive body base 40 and ground rod 84 are selected so that the common mass moment of inertia with respect to the connection region to the
• Bending arm 28 is substantially equal to the moment of inertia of the drive body 42 to its connection region on the bending arm 30.
• the coupling body 26 corresponds to Figures 5 and 6 that of Figures 2 to 4.
• the material used for the coupling body 26 and possibly its parts is titanium.
• FIGS. 7 and 8 show a modified coupling body 26, which has a more compact construction in the direction perpendicular to the axis of the bending arms 28, 30.
• Components that have already been described with reference to the preceding figures are given the same reference numerals, even if they are geometrically slightly different, provided that they correspond functionally.
• the projecting beyond the frame of the coupling body 26 drive body 42 is reduced in size and protrudes only very slightly into the interior of the frame.
• the protruding into the interior of the frame drive body 40 is guided with its flat end face to just before the inside of the bending arm 30.
• the drive body 40 serves as a coupling section for a sonotrode.
• the threaded hole 56 is provided in it.
• a through hole 86 is provided, through which an output section 88 of the sonotrode 24 can extend under play.
• the axis of the bore 86 runs parallel to the bending arms 28, 30 and in the middle between them, so that the abutment portion 88 engages under a lever arm (via the drive body 40) on the bending arm 28. Because of this geometry of force introduction, a good swinging of the coupling body frame formed by the bending arms 28, 30 and the connecting arms 32, 34 is ensured, although the drive bodies 40, 42 with respect to the other Embodiments have significantly reduced mass.
• the coupling body 26 according to Figures 7 and 8 is characterized by a particularly compact design and good deflection of the input movement in an inclined to this at 90 ° extending output motion.
• the coupling body according to claim 9 is substantially similar to that of Figure 7.
• the drive body 42 has now disappeared, however, and the end face of the drive body 40 is once again moved closer to the inner surface of the bending arm 30, as close as is possible in terms of manufacturing technology.
• the production is carried out so that a plate-shaped blank is milled with the desired outer contour and in it two openings with the rounded portions 38, 48 are generated, initially a central continuous web remains, which later forms the drive body 40.
• the through-bore 86 is drilled and the hereby aligned threaded bore 56 incorporated.).
• the slot 52 is milled as close as possible manufacturing technology at the inside of the bending arm 30 with a narrow disc milling cutter.
• the bending arm 28 has due to the drive body 40 carried by him a poorer vibration behavior than it would have a same cross-section bending arm without attached drive body. To compensate for this difference, the bending arm at the bottom in Figure 9 is about 25 percent wider (dimension in Figure 9 vertical direction) formed as the bending arm 28. In this way, both bending arms 28, 30 have the same natural frequency and oscillate with their Connecting arm 34 adjacent ends in phase with the same amplitude.
• the coupling body 26 measured in the longitudinal direction (in the drawing in the horizontal direction) has a total dimension of 24.2 mm, in transverse (vertical in the drawing) direction, the lower boundary surface of the coupling body 26 has a distance from the The longitudinal axis thereof, which is 4 mm, while the upper outer surface of the coupling body
• the thickness of the plate from which the coupling body 26 is made 5 mm
• the diameter of the through hole 86 is 4 mm
• the diameter of the threaded bore 56 3.5 mm.
• the material used for the coupling body 26 is titanium.

Landscapes

• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Dentistry (AREA)
• Public Health (AREA)
• Life Sciences & Earth Sciences (AREA)
• Veterinary Medicine (AREA)
• Epidemiology (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Surgical Instruments (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
• Apparatuses For Generation Of Mechanical Vibrations (AREA)
• Connector Housings Or Holding Contact Members (AREA)
• Electric Cable Arrangement Between Relatively Moving Parts (AREA)
• Details Of Connecting Devices For Male And Female Coupling (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=38197711

Family Applications (1)

Country Status (8)

Families Citing this family (4)

Family Cites Families (7)

• 2006
  • 2006-03-10 DE DE102006011593A patent/DE102006011593A1/de not_active Withdrawn
• 2007
  • 2007-03-08 EA EA200801950A patent/EA014087B1/ru not_active IP Right Cessation
  • 2007-03-08 KR KR1020087022976A patent/KR20080109770A/ko not_active Application Discontinuation
  • 2007-03-08 CA CA002656898A patent/CA2656898A1/en not_active Abandoned
  • 2007-03-08 CN CNA2007800086496A patent/CN101400314A/zh active Pending
  • 2007-03-08 JP JP2008557667A patent/JP2009529359A/ja active Pending
  • 2007-03-08 EP EP07723105A patent/EP1993464A1/de not_active Withdrawn
  • 2007-03-08 WO PCT/EP2007/002010 patent/WO2007104470A1/de active Application Filing

Non-Patent Citations (1)

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