US3798776A - Dental-type handpiece - Google Patents
Dental-type handpiece Download PDFInfo
- Publication number
- US3798776A US3798776A US00178195A US17819571A US3798776A US 3798776 A US3798776 A US 3798776A US 00178195 A US00178195 A US 00178195A US 17819571 A US17819571 A US 17819571A US 3798776 A US3798776 A US 3798776A
- Authority
- US
- United States
- Prior art keywords
- collet
- spindle
- tool
- housing
- ring
- 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
Links
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- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 1
- AIXAANGOTKPUOY-UHFFFAOYSA-N carbachol Chemical compound [Cl-].C[N+](C)(C)CCOC(N)=O AIXAANGOTKPUOY-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- MKWYFZFMAMBPQK-UHFFFAOYSA-J sodium feredetate Chemical compound [Na+].[Fe+3].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O MKWYFZFMAMBPQK-UHFFFAOYSA-J 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- A61C1/08—Machine parts specially adapted for dentistry
- A61C1/14—Tool-holders, i.e. operating tool holders, e.g. burr holders
Definitions
- This invention relates to dental-type handpieces wherein a hollow spindle has a collet in one end for gripping a burr, or other cutting tool for precision cutting of bone, tooth, or material of similar nature.
- the collet is held in place by a readily removable C-ring, and the spindle is supported for rotation in a tubular housing.
- spindle and collet are mounted within a tubular housing.
- the housing has a lever or the like for actuating the collet when it is desired to insert, remove, or change tools, and also provides the means with which the dentist grasps the tool in his hand.
- the handpiece though relatively-small and delicate, and a more or less precisiontype mechanism, is nevertheless subject to substantial wear and tear in use. It is therefore rather difficult to construct one that is simultaneously simple, easy to maintain, sturdy, and not overly-costly. Many tend to be put together rather permanently, so that, for example, the dentist is unable to get at the mechanism within the housing, say, to clean it.
- the portion of the housing containing the collet is made removable and the collet is fixed to the hollow spindle by means such as a C-ring, accessible to the dentist, once the said portion of the housing is removed.
- the spindle is journaled within the housing by a pair of bearings only one of which is fixed to both spindle and housing.
- the other bearing fits in the housing and is fixed to the shaft, but not to the housing. In this way, assembly of the handpiece when it is manufactured, only requires registration of spindle and housing at one point, and cross-loading on the second bearing is eliminated.
- FIG. 1 is a partially-sectioned view of the tool-end of the hand piece of the invention, the sectioning being taken along the long axis of the handpiece, and is to scale but about four times life-size.
- FIG. 2 is like FIG. 1, exceptit is a view of the motor end of the hand piece according to the invention.
- FIG. 3 is a view such as would be seen upon looking into the handpiece from the left of FIG. 1, and is to the same scale as FIGS. 1 and 2.
- the handpiece presents to external view, at its tool-end, a tubular housing 1 terminating in a nose cone 2, out of which projects the shank 3 of a suitable tool having a burr orother element (not shown) for working on teeth.
- Nose cone 2 is threaded onto housing 1, as indicated at 4. Inside the nose cone is one end of a hollow spindle 5, and inside this one end is a collet 6. Also, within the spindle is a collet operator 7, only part of which is shown in FIG. 1) urges operator 7 toward the left in FIG. I and, due to the slot 10 (one of four equispaced about the circumference of collet 6), squeezes the split portion of the collet against the sides of shank 3, thereby frictionally securing shank 3 in place.
- This collet and collet-operator structure and functioning is, of course, well known in many forms including the one shown, as thus far described.
- Collect 6 which is made of a somewhat springy metal, has an enlarged circularly right cylindrical portion 11 which is slidingly received in spindle 5 and terminates in a circularly right cylindrical flange l2 similarly received 'in spindle 5.
- the diameter of flange 12 is larger than the diameter of portion 11 which in turn is larger than the diameter of the split portion of the collet.
- Portion 11 and flange 12 of the collet fit snugly in spindle 5, forming a more or less rigid part thereof in effect.
- Flange 12 seats on an annular ledge 13 in spindle 5, and is held in place by a C-ring 14, a suitable annular groove being provided internally of spindle 5, into which groove the ring fits.
- a ball bearing 16 having an outer race 17 and an inner race 18 provides for rotating spindle 5 with respect to housing 1.
- the inner race 18 is fixed to the spindle by any suitable means for preventing it from sliding along the spindle. As shown, a snap ring 19, in a suitable groove around the spindle, urges therace 18 against a ledge around the spindle on the other side of race 18 from the ring 19.
- housing 1 includes a middle housing portion 22 and an end using portion 23. As indicated at 24, portion 22 is threaded into portion 23.
- a ball bearing 25 is located between portions 22 and 23, the fit of which provides for locating spindle 5 correctly with respect to housing 1, when assembling the handpiece.
- the outer race of bearing 25 is fitted into the end of portion 22, but projects slightly out of it.
- the inner race of the bearing abuts the snap ring 26 which is, received in a suitable annular groove around spindle Ss exterior.
- To the right of bearing 25 is a spring washer 27 held against the inner race only of the hearing by means of ledge 28 of a groove 28A on spindle 5.
- a ledge 15 of portion 23 faces the outer race only of bearing 25, which in turn seats on a ledge 29 of housing portion 22. In assembly, the two housing portions are screwed tightly together, thereby rigidly clamping the outer race of bearing 25 between them.
- spring washer 27 prevents spindle 5 from moving to the left,
- Washer 26 is flat and axially incompressible, whereas washer 27 is undulant and split, or otherwise so formed that it has to be compressed axially to seat it in groove 28A after having been sprung open to get it on the spin dle to a position over the groove 28A.
- groove 28A extends to the left slightly under the bearing 25, the force due to the compression of the washer jams the bearing solidly against washer 26 which, for all intents and purposes, is a rigid part of spindle 5.
- the fit between housing I and spindle 5 is controlled solely by fixed points on spindle 5 and on portion 22, namely, ledge 29 and ring 26, independently of the threaded engagements at 4 and 24.
- the parts inherently fit correctly together, and no adjustments are required for dimensional variation of the separate parts.
- operator 7 requires it to slide along the spindle, so it is provided with circularly right cylindrical enlarged portions 30 and 31, allowing it to fit fairly closely yet slidable within the spindle 5, while neither cocking or binding.
- a spring 32 prov-ides for making the flared end of bore 8 squeeze the parts of the slotted end of the collet 6 together.
- Any suitable means may be provided for this.
- such means will take the form of a handle 33 which when deflected clockwise, shifts a ring 34 along the hollow spindle 5.
- the middle part of pin 36 is fixed to the operator 7, and its ends are fixed to the ring.
- Handle 33 is pivoted to housing portion 23, as indicated at 38, and a set screw 39 threaded therein projects from the underside of the handle against an arm 40 projecting from a fork having a pair of arms 41 (only one is visible in FIG. 2) straddling spindle 5.
- the fork is pivoted to housing portion 23, as indicated at 42, so if the handle is deflected clockwise, the fork is deflected anti-clockwise, whereby arms 41 push ring 34 to the right, as aforesaid.
- a leaf spring 43 connected at one end to handle 33, and having its other end bearing on an arm 44 of the fork, biases the arm 40 into engagement with set screw 39 and holds the lever 33 and fork arms 41 in the position shown except when the lever is being deflected.
- the lever is deflected, of course, by the operator's hand.
- Housing portion 23 is cut away as indicated at 48, to accommodate the fork and the motions of its arms 40 and 44.
- Housing portion23 provides for connecting a motor, or other rotary driving device, at its end, which is open to allow access to the driven end of spindle 5, which is formed as a clutch element, chuck, or any other suitable means for engaging the driving element.
- spindle 5 has a flare 45 for fitting a tapered motor coupling (not shown).
- Bearing 25 is the main bearing of spindle 5 and, since the front bearing 16 floats, so to speak, that is, can slide axially of the housing 1 on land 20, bearing 25 absorbs all the cross loading that arises during use of the hand piece. It is therefore chosen to be sufficiently sturdy and large to suit these functions. Bearing 16, on the other hand, needs to be substantially nothing more than a substantially frictionless guide for eliminating wobbling of spindle, due to such play as bearing 25 may permit. Hearing 25 thus forms the sole means for fixing the spindle 5 in place in housing 1.
- the threaded fit at 24 is frozen by treating the threads with a suitable substance, such as Loctite, so called, or by other expedients which will prevent loosening of the housing portion 22 from housing 22, as a result of vibration, use, or casual tampering.
- a suitable substance such as Loctite, so called, or by other expedients which will prevent loosening of the housing portion 22 from housing 22, as a result of vibration, use, or casual tampering.
- Such expedient is not applied to threading at 4 since it is desirable, as pointed out above, to allow the dentist to remove nose cone 2, and, moreover, it is unneces-. sary to fix the nose cone so permanently in place, because its loosening or removal will not disturb the working relationship of the moving parts of the hand piece.
- bearing 16 could be arranged to be fixed to housing portion 22 and to float on the spindle. Again, expedients other than threading could be used to hold the housing portion together. However, whatever the expedient or expedients used, preferably the engagement of portions 22 and 23 are relatively permanent, whereas that between nose cone 2 and housing portion 22 must be such as to allow easy removal of the nose cone from portion 22.
- devices other than C-rings can be used to hold the collet in place in spindle 5, but are preferably not of a kind in the nature of bolts, nuts or other threaded elements, which unlike the C-ring 14 are neither inherently adapted to being readily removable, nor at the same time proof against loosening due to vibration.
- tool gripping elements other than collets can' be used on the spindle 5, provided they are readily removable, as by removing C-ring 14 or the equivalent.
- a dental-type instrument having a hollow-ended driving spindle and a collet within such hollow-end; said collet being fixed to said spindle, there being readily-releasable means cooperating with said spindle and said collet for'normally maintaining said collet in fixed relation to said spindle, said readily-releasable means, when released, being adapted to allow removal of said collet from said hollow-end;
- collet and said spindle being adapted to receive tween said abutment and said readily-releasable a portion of a tool for driving said tool by means of means;
- g 2 The dental-type instrument of claim 1, wherein Said hollowend having an intern?
- said collet-operating means includes a collet-operator, rounding Said collet, Said collet having fl g 10 and a spring urging said operator against said collet and means substantially seated on said abutment, and sand flange means agamst 531d g slmultaneouslyv said readily releasable means contacting said spinr operating aid c llet to clamp Said tOOl.
- dle and said collet for fixing said flange means beabutting said flange means and received in an internal groove in said hollow-end, said flange means being between said C-ring and said abutment.
Abstract
Description
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00178195A US3798776A (en) | 1971-09-07 | 1971-09-07 | Dental-type handpiece |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00178195A US3798776A (en) | 1971-09-07 | 1971-09-07 | Dental-type handpiece |
Publications (1)
Publication Number | Publication Date |
---|---|
US3798776A true US3798776A (en) | 1974-03-26 |
Family
ID=22651598
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00178195A Expired - Lifetime US3798776A (en) | 1971-09-07 | 1971-09-07 | Dental-type handpiece |
Country Status (1)
Country | Link |
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US (1) | US3798776A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1981000669A1 (en) * | 1979-09-12 | 1981-03-19 | American Hospital Supply Corp | Chuck assembly for dental handpieces |
US5074789A (en) * | 1989-09-26 | 1991-12-24 | Nakanishi Dental Mfg. Co., Ltd. | Chucking device for dental handpiece |
US5549474A (en) * | 1993-10-06 | 1996-08-27 | Cohen; Yechiel | Clamping device particularly useful for dental handpieces |
US5810588A (en) * | 1993-10-06 | 1998-09-22 | Cohen; Yechiel | Clamping device particularly useful for dental handpieces |
US5960140A (en) * | 1996-03-01 | 1999-09-28 | Surgical Acuity, Inc. | Quick-release connector for fiberoptic cables |
US6656181B2 (en) * | 2000-11-22 | 2003-12-02 | Robert A Dixon | Method and device utilizing tapered screw shanks for spinal stabilization |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3475817A (en) * | 1966-09-08 | 1969-11-04 | Kaltenbach & Voigt | Portable holder for dental tools or the like |
US3631597A (en) * | 1969-09-15 | 1972-01-04 | Star Dental Mfg Co | Handpiece with improved chuck assembly |
-
1971
- 1971-09-07 US US00178195A patent/US3798776A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3475817A (en) * | 1966-09-08 | 1969-11-04 | Kaltenbach & Voigt | Portable holder for dental tools or the like |
US3631597A (en) * | 1969-09-15 | 1972-01-04 | Star Dental Mfg Co | Handpiece with improved chuck assembly |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4279597A (en) * | 1978-03-10 | 1981-07-21 | American Hospital Supply Corporation | Chuck assembly for dental handpieces |
WO1981000669A1 (en) * | 1979-09-12 | 1981-03-19 | American Hospital Supply Corp | Chuck assembly for dental handpieces |
US5074789A (en) * | 1989-09-26 | 1991-12-24 | Nakanishi Dental Mfg. Co., Ltd. | Chucking device for dental handpiece |
US5549474A (en) * | 1993-10-06 | 1996-08-27 | Cohen; Yechiel | Clamping device particularly useful for dental handpieces |
US5810588A (en) * | 1993-10-06 | 1998-09-22 | Cohen; Yechiel | Clamping device particularly useful for dental handpieces |
US5960140A (en) * | 1996-03-01 | 1999-09-28 | Surgical Acuity, Inc. | Quick-release connector for fiberoptic cables |
US6106159A (en) * | 1996-03-01 | 2000-08-22 | Surgical Acuity, Inc. | Quick release connector for fiberoptic cables |
US6656181B2 (en) * | 2000-11-22 | 2003-12-02 | Robert A Dixon | Method and device utilizing tapered screw shanks for spinal stabilization |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KERR MANUFACTURING COMPANY, A CORP OF DE. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SYBRON CORPORATION;REEL/FRAME:004610/0363 Effective date: 19860731 Owner name: KERR MANUFACTURING COMPANY, A CORP OF DE., STATELE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SYBRON CORPORATION;REEL/FRAME:004610/0363 Effective date: 19860731 |
|
AS | Assignment |
Owner name: MANUFACTURERS HANOVER TRUST COMPANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. ASSIGNS THE ENTIRE INTEREST;ASSIGNORS:SAC/THERMOLYNE, INC.;SAC/BARNSTEAD, INC.;SAC/THERMO-BARN, INC.;AND OTHERS;REEL/FRAME:004834/0513 Effective date: 19871020 Owner name: MANUFACTURERS HANOVER TRUST COMPANY,STATELESS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SAC/THERMOLYNE, INC.;SAC/BARNSTEAD, INC.;SAC/THERMO-BARN, INC.;AND OTHERS;REEL/FRAME:004834/0513 Effective date: 19871020 |