DE1992122U - Electric motor for driving dental tools such as drills, cutting tools and grinding wheels - Google Patents

Description

DR. ING. HANS LICHTI · PATENT ADVOCATE

KARLSRUHE-DURLACH · G RÖTZIN G ER STRASS E 61

TELEPHONE 4 1124

^: May 30, 1968 R 30 119 / l4b Gbm 1234/64

Ritter Company Inc., 400 West Avenue, Rochester N.Y. /UNITED STATES.

Flow motor for powering dental tools such as Drills, cutting tools and grinding wheels.

The invention relates to one with a reduction gear transmission combined flow motor for driving tooth « medical tools, such as drills, cutting tools, and grinding wheels, at relatively low speeds.

Although the invention can also be used in other areas of application th can be used, it is primarily intended for use in dental technology as a drive means for dental tools to provide high torque generate relatively low speeds.

Before the advent of the tendon-piling drills were all dental drills or other tools from so-called »th dental drills over the engine drive belts« »

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and driven pulley links. The turas drive comprised a "drive belt driven by a motor - which was guided outside or inside along a - -Dentaler steering arm and further *" to an adjoining, flexibly articulated Atasieger. The boom carried a dental "at the end. Handpiece into which the shaft of the drill or tool was fitted. The drive took place via a rope or a cord that was guided over and around several pulleys. This general arrangement of the drive for dental drills or other tools was used for many years, with a rule resistance usually accommodated in a foot switch, the speed of the drill could be increased from approximately - 3 * »500 rpm to 20-25,000 rpm / min "can be varied.

The drive connection via drive belts and belts «»

discs or via driving ropes and "Pulleys such boosts has been in the dental office -stets difficulties. be <s * rides due to rupture of the driving belt, or drive ropes, slippage of the drive cables on the pulleys and releasing the tension of the drive cables _s what oneself as a loss impact speed of rotation "and torque Ferner-was foe ** - träehtliche number of the interconnected parts insbee * sondere of the rotating parts between the motor and drill shaft a constant source of ^{interference:..} Such Official instincts can generally considered suitable for Generation -a "high torque at relatively low speed" can be considered ""

In recent times, the so-called quick drill has become popular with dentists from several founders. The speed of rotation of such drills amounts to 100,000 rev / min to about 3OO,000 rev / min. They consist of a turbine, which in allges "my directly to the shaft of the driven drill wire kung connected e usually compressed air driven .. are and as" fast winding drill the air turbines ⁿ © known "Generally, they produce a low torque" and a high speed. Such turning speeds have certain advantages, as they cause the patient less pain and enable the dentist to do his work more effectively and much faster *

While such high-speed drills represent a great advance in the field of dental treatment; brought «,, they couldn’t completely replace the conventional .dot drills described above. With some. Working the dentist is dependent on working speed with relatively low Drehgeschwine and the drill must be able _{to generate 9} a relatively large torque. Low rotational speeds at high torque are preferred by most dentists, for example, for the final work on a tooth prepared for the filling ₃ and also for other purposes which do not need to be mentioned. For this reason, manufacturers have recently been equipping conventional devices with a high-speed drill driven by compressed air and a tooth drill for low rotational speeds with high torque. ■;

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Efforts have recently been made to mn the conventional Zahixbohrmaschine through fluidized door * »" Binen or other means to replace ^ and thus to the dentist to give what he is for his activity in the form relative low speed and high torque required «

An object of this invention is to provide a drive for " a dental cutting tool or "a drill to schaffex which at the same time achieve a relatively high torque at a relatively low rotational speed and the elimination to enable the costly and failure-prone dental drill and its accessories »

- Another object of the invention to provide a highly ₉ "effective flow ** or air motor" by means of which a variable-speed drive 'for- the drill but _s can be made available first. Line should serve the invention.) - To equip the dentist with an Antdeh * which allows a relatively large torque to be generated at relatively low rotational speeds.

Another object of the invention is to provide a station wagon nation of a fluid flow motor with a. Reduction gear to create j which is extremely effective in Betdeb and the high Output speed of the motor in connection with the dental drill provided propellants in a

■ converts much lower speed, -to relative to generate low drilling speeds with relatively high torque.

Yet another object of the invention is to provide a dental drilling device with improved means for Carrying the drill and for 'clamping' and releasing the drill ** shaft and a drive for the drill, wel «s» rather with the power source of one with a subordinate law ** drives combined flow motor 'quickly connected or can be replaced by him.

The invention further has a flow motor combined with a reduction gear for target _4, in which a shaft can be preloaded with a rotor to the shaft. and to push the runner in a direction between two members which cover the end faces of the runner, "one of the selected cover members being movably arranged together with a roller bearing driven by the shaft and designed as a reduction gear, and the lower part * ". The setting gear and the movably arranged cover gear are arranged in relation to one another in such a way that the setting of a screw nut forces the roller bearing to move the roller bearing cage or the drive element with it. to drive the lowered speed and at the same time

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Liehe cover is adjusted so that the play of the rotor is balanced on both cover members _s "of the engine can be called that vote as ^M At>« «

Further features and words of urgency of the "invention. Will be« »", especially set out in the claims are tmd by'that according to « following description in connection with the attached characters » nings clarified »in these shows

Fig. 1 is a longitudinal section of the combined. Strömufigs »" motors and reduction gear according to the invention §.

a longitudinal section of the .Handstückes in an arrangement to take over the reduced 'speed of the one combined with the gear reducer Fluid flow motor $

the drive connection of the handpiece in one » Order for high speed in longitudinal section |

Figi -4 a section along the. Line '4 4 of FIG i with a view in the direction of arrow ₉ -the the sliding leaf "and" orifices, the common outlet opening and the inlet for compressed air _s illustrated by which an opening for a Brehrichtting of the rotor * and the other:.. For reversing the direction of rotation of Lau «* fers determined is $

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Fig. 5-F is a view of the motor end of the plug or end piece, which is facing the X / runner § this view illustrates the course of the channels for the compressed air to a point behind the underside of the sliding sash. to drive them outwards when starting the engine j

Fig. 6 * is a view of the outside of the plug or end piece - showing the openings for the. entry

and exit of the "compressed air" and the inlet «*. * ■ - '. canal for water illustrated |

Fig. 7i a side view of the plug or end pieces which in dashed lines illustrates the various channels running in it »

Via StröV combined with a reduction gear. The motor according to the invention is housed in a motor housing Ii (FIG. 1) that is open on both sides and designed as a cylindrical tube. That one end of the housing 11 is shown on the inside, as at 12 _s (generally designated by the numeral 131 and shown in Figure 2) with a thread for receiving the mounting ^ handpiece provided, .- * the other end with a thread, as shown at 1.4 ₉ for receiving a / Sfeopfens or end piece (generally designated by the number l6) provided.

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the motor housing 11 is a flow motor (generally marked with the number 17) tun.d-.a reduction gear (generally designated by the number 18) built in. Der.S'tröe » mungsiaotor 17 is arranged so that the binbaue handpiece 13 either with the speed of rotation of the rotor and the tepid remote shaft or can be driven at a reduced rotational speed via the reduction gear »

The flow engine, generally designated by the numeral 17-designated "net _t has a rotor housing 21 ₉ whose outer wall is cylindrical 22 and fitted into the motor housing. 11 The inner wall 23 of the rotor housing 21 is eccentric to the axis of the unit and to the central axis of the motor housing 11, as shown particularly clearly in FIG.

A cylindrical rotor 26 in cross section (Figure 4) is provided with a plurality of radially Milled grooves 27 'in this case, six of which the inner end surfaces curved on the sheets of relatively large circles ¹ - are. Each of these grooves 27 is adapted to receive a sliding leaf 28. The sliding wings 28 are made to fit so that they can slide radially in the grooves when they are pushed outwards as a result of centrifugal force, the outer edges 29 of the sliding wings (FIG. 4) being eccentrically filed on the inner wall of the Slide along the Lgtifergehäuses 21.

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It would be possible to use flow turbineM. or to use motors of other types instead of the Ib β special _s flow motor shown in the drawings - For example a turbine or motor could be used in which blades and rotor form a unit »However, such a turbine or""motor would not be in everyone Look at the positive replacement oil unit, as it does not immediately develop torque when it starts up. With an engine of the one shown here

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Type form in well-oiled barrels: housing 21 ©, of course, except when the motor is stopped ** the sliding sashes form a tight seal with the inner casing 23 of the eccentric rotor housing 21. The air loss is reduced to a minimum and this arrangement is therefore a positive one Install »unit for practical purposes. A motor of the type shown will - when using compressed air in the range of pressures ₉ such as. you with the lately in dental. Practices existing lompres »» sensors are available _} a relatively high and instant ». develop a lot of torque »

The above-mentioned end portion or »plug, all" common designated by the numeral "16 ₉ is provided with; eix & n threaded 36, and screwed in so-into the internal thread 14 so that its end face 37 is communicated with the end face 38 of the rotor in contact * The end face 37 covers this 1fei®e the runner 26, the side edges of the sliding wing 28 and the lateral end edge of the eccentric runner housing 21.

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As clearly shown in FIG. 5, which is a view of the end face 37 of the end piece, the end piece has two inlet openings or channels 41 _s 42 for the inlet "of the compressed air" Das Eaöaästück 1st; "as shown in number 43 represents" with a External thread provided for receiving a passport piece (not shown), which preferably carries flexible inlet ducts or hoses connected to the inlet openings 41, 42. The end piece is also provided with a common outlet duct 44 which absorbs the air or another flowing medium that flows into the runner from one of the two inlet channels 4Ii ₁ 42 and is later expelled between the sliding leaves 28 "

The flow motor is equipped with a foot switch (not shown) through which air can either go to the one »■""" ■. ' passageway 4l or 42 delivered-is "The foot switch is also provided with means for changing the air pressure, au change the rotational speed of the rotor and lieferungsw with oils and regulation _{means, etc.} which are similar to those new ~ ingrained at high speed generally Ge #» When the air is "supplied to the inlet channel 41" according to the position of the foot switch, the rotor rotates counterclockwise, as seen from the end of the rotor (Fig. 4). If the air is fed to the inlet channel 42 according to the position of the foot switch, then the rotor can be turned in a clockwise direction.

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In the dental work it is very desirable that the dentist is able to rotate the drill either in one direction or in another direction becomes dull _s: or when the dentist. uses a threaded shank to mount a grinding wheel. In the latter case, the grinding wheel would normally roiieren in the direction _t in which the loop "solid head is rotated on the shaft. If the loop disk is to be removed, reversing the motor easily accomplishes this success.

The passages soffnungea or "-" kaB.äle / 42 run in - ■ the end piece, as shown in Figure 7- with dashed lines. The openings 41, 42 merge into openings or incisions 41 * _s 42 * in the adjoining end face of the rotor 26. The end face 37 of the end piece 16 (FIGS. 5 and 7) is cut off on one side and one closes on the cylindrical part flat surface 51 (Fig. 5 ^and 7) -au. » whereby a chamber 50 (FIGS. 1 and 5) is formed, which is connected to the common outlet channel 44. "This chamber or" * "- the cavity 50 is, as is particularly evident" in FIG. 5 _s outer that with the cells between the sliding sash:! * 28 in. connection. To properly adjust the end piece 16 in relation to the eccentric rotor housing 21 so that the openings coincide with the adjacent rotor , these are eccentric Lau »

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fer housing 21 and the end piece 16-. with bores - for receiving one or more alignment pins 5 ± a. Mistake.

As is clearly shown in FIG. 5, the end face 37 of the end piece 16 has two angled grooves 52, 53 as air ducts, the larger part of which is curved in a circular arc around the axis of the rotor. These air ducts 52, ^ J steep on the one hand with the passage ducts 4l _$ 42 on the other hand with the lower area of the natea, in.deaen the sliding sash .. 28 slide through incisions in the adjoining face of the eccentric barrel housing 21 in Yerbimdung «For this purpose Each of the grooves is milled out along an arc 54 and the sliding leaves 28 have an irregular shape, along their feet or their inner ends *, as shown at number 56 «-. posed. By this arrangement arise ent in the mute * - ^»: lang the inner ends of the sliding vane passages through which air from one of the two grooves may eisiströmen §2 or 53 *, which urges the sliding wings radially outward." .

The outward movement of the sliding wings helps the runner to start, which is important because the runner must be started and stopped hundreds of times a day air flowing in from them to the sliding sash, and drives them on «the centrifuge»; gal force drives the sliding sash, in the grooves, outwards ₄ to.

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they the inner jacket 23 of the eccentric rotor housing issue. The torque development "is mostly, eyes« » visible present. This process presses the outer "*". -Edge the sliding sash in the oil film -on the liuiene mantle of the rotor housing .; The purpose of the arch-shaped Milling of the grooves 27 (5 ^) consists in the sliding ** Movement of the sliding sash against the inner casing 23 of the " Support housing. to .the torque "of the" Ströinimgse motor with a given cross-section »■. ; "

The rotor 26 is for example manufactured in one piece with a shaft 38 , although these two parts — also — gee ”- are designed and separated. rigid; can be connected to each other. In the special. Execution form. the. Parts for -.- · Implementation of the concept of invention, should rotor and shaft along the longitudinal axis of the shaft as. be a unit to move. The shaft 58- is supported in roller bearings 6i and. That. Rolling bearing 61 is, for its part, a permanent part of the reduction gearbox 18 Its first task is to support the cage ring of the reduction gearbox, as will be immediately clear.

¥ ie becomes apparent from the following remarks, the axial movement play-of the rotor., And the shaft be only a few thousandths of an inch. To the wave ve.r «* -. push to. can, presses the edge surface 63 of a bowl for **

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migen washer 64 on the edge surface of the outer Race 66 of the rolling bearing / 62. The shaft 58 is at its end with a diameter to an annular shoulder 67 ver * jungt, against which the inner race 68 of the roller bearing can support.

The end of the shaft 58 '»the roller bearing 62, the underlay

washer 64 and a spring 69 are in one in the end piece attached hole 7I® The hole 71 is with provided with an internal thread 72 into which an adjusting screw 73 can be screwed in. The adjusting screw has the Head a slot 74 for "attaching a screwdriver ο

When the adjusting screw 73 is screwed in, the "pressure from the spring 69" is reduced. Washer "64, -" Transfer the outer race 66 of the roller bearing and the rolling elements to the inner race 68 of the roller bearing. The inner race 68 presses against the shoulder 6? and moves the shaft and the rotor in the direction "to the left according to the kn" sees in Figure 1. Exact adjustment of the pressure on the spring 69 allows the shaft and the ¥ orspannuixg l »äm" fers in the leftward direction as viewed in Figure 1.

A water connection is usually provided on dental drills to allow the teeth to be drilled and to cool the drill bit while drilling. For this purpose this is.

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End piece with angularly arranged bores 76 ver & - ._ .., the ends of which open into a fitting piece 77 with an outlet 78. The outlet 78 may be connected to a rigid or flexible tubular member (not shown). The end of the tubular member is directed, in accordance with general practice, to pour or spray the water onto the end of the drill bit and the adjacent drilled tooth splashes.

The reduction gear, generally with the number. called, consists essentially of one. BinbauöWälz "? * Bearing with an outer race 81 _{1 of} a plurality of balls 82 or other rolling elements, an inner race 83 and an extended cage ring 84. The cage ring 84 is at its extended end with a plurality of claws, in the present case two - provided - ... those as parts -. serve a claw coupling. The: Kl; outer feet. are designated with the number 87 and. the claws themselves with the number 88. This claw coupling, which forms the drive element of the combined air motor and reduction gear, is connected to a similar claw coupling, as will be described in detail later, by means of which the tooth «Medical tools, such as dental drills, grinding wheels or others, can be driven.

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The inner race 83 is, as "shown 91 in the longitudinal direction with -two grooves" when provided, to provide a guide for receiving a fixed in the! Skins 58 pin 92nd Am fixed in an annular groove 94 of the shaft 58 "* the ring 93 presses with the pressure emanating from the spring 69 on the flank of the inner race 83." By turning the adjusting screw 73, this pressure can be varied by the To change the amount of preload "

Without further ado, it can be understood that the pin $ 2 can move in the guide slot 91. In general, both parts, the rebate bearing and the. the skins move a few thousandths of an inch toward each other as determined by the bias of the spring 69. In general, this bias is a clearance between the face "" surface 37 of the end piece 16 ' and the face 38 of the; Cause or increase a runner * -

In the internal thread 12 of the motor housing 11, an adjusting screw 95 is not shown with key openings {) in its outer end side is screwed The adjusting member ^"*": screw is free from the driven liäfigring 84, as shown at 100 the alignment © is ο When screwing in screw 95 this rests against the outer race 81 of the roller bearing. The amount by which the adjusting screw 95 can be adjusted is, as will be explained below , .variable *

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The other end of the outer race Si is supported against a spacer ring 97 from ₉ which is slidably fitted into the cylindrical motor housing 11. the end face 101 of the air motor 17 »consisting of the end face of the rotor 26, the flanks of the sliding wing and the end face of the eccentric rotor housing 21.

The terminating member is movably arranged and forms the end wall towards the end of the runner »It can be in Longitudinal direction of the rotor 26 on the shaft 58 by a ver ** changeable amount depending on. the setting of the Adjusting screw 95 can be moved

The end member 98 has a bearing hub 102 _s which surrounds the shaft 58 and an annular extension I03 in which several disc springs -104 are arranged. arranged in opposite directions, as shown in the drawing, and the stack of disc springs absorbs the pressure exerted on spacer ring 97. The reason for using a stack of disc springs is that to reduce the demands on the tolerances of the various parts and a relatively large adjustment range for .-

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the adjusting screw 95 with relatively little deformation of the Stacks of disc springs about a thousandth of an inch too achieve.

In a compressed air motor of the type shown, it is important that the play between the end faces 37 »38 and the end faces 99» 101 is the same understands that there is "a film of oil" between these surfaces. _t When the toles; - * »dancing are balanced, the air motor is" tuned. "This fact can easily be determined by hearing while the motor is running *

The first step in tuning the, engine with g-e ** -. loosened adjusting screw 95s consists in pretensioning the shaft and the rotor in the direction * -to the left »Das. we ^ tae * already mentioned] by turning the adjusting screw 73 - it ".. is enough to move it over the spring 69 * the support washer 64 and the roller bearing 62 on the shoulder 6? the wave pfhick exercises. As a result of this process., The shaft 58 is shifted two or three thousandths of an inch to the left and it represents;. there is a play between the end faces 37 and 38, wel% before s * the. the desired amount.

The pressure on the shaft 58 to the left, according to the "*" See Figure 1., exerts pressure on the ring.93, the. -

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the inner race 83 of the as-'reduction gear * serving roller bearing to the left pushes «This DruckV is transmitted through, the balls 82; and moves the outer race, 81 also to the left »Die Justier *». As already mentioned, screw 95 is loosened in the eye on the "outer race 8l at" the time of preload, of shaft and runner. *

In the further course of the voting process. of the air motor, the adjusting screw 95 is turned axially inward, - to ^{exert a:} "/ -pressure to the right on the outer-" race 81 »Da *» "at the inner race 83 pushes against the ring 93 · The through the adjusting screw The pressure exerted on the outer race ring expresses the outer and inner race rings, the - in the - relaxed "state assumed position" When the outer race 81 is loaded and held in a certain position, the direction of the diagonal pressure exerted on the balls creates a frictional force. This frictional load on the balls is variable and is determined by the bias of the spring * 69 and the setting of the adjusting screw 95 »Ira each. case there is a significant degree of friction and the aagetrieTjeae part, the cage ring 84, rotates with a remarkable Reduced "* set speed" compared to the "speed" of the *. Shaft 58. The reduction gear, consisting of a roller bearing, works in a similar way to a flange gear.

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Simultaneously with the introduction of the preload in

the rolling bearing and the consequent increased friction of the rolling elements in the bearing to such an amount that the Käfigrimg is driven with herabgesetzter.Geschwindigkeit, the stack of spring washers is 1Θ4.komprimiert · If the end "page 99 of the Absehlußgliedes 98 with the end face 10 1 of the air motor comes into contact, the rotor turns and 'its shaft is inevitably shifted to the right by an extremely small amount. Anyone. Point, the play between the opposite end faces 99s 10t and 37138 is compensated for when the pressure is applied by means of the adjusting screw 95. The resulting play is extremely small and as soon as it is balanced, the pitch generated by the runner changes its pitch, so that it is easy to determine with the aid of the farm when the air motor is tuned and the play is balanced.

Bs follows the description of the. Figure 2. "Bas installation manual" · * tee * generally designated by the numeral 13, has a head piece 111 having a bore 112, which tion in an Extension C & 120 opens "For example, the shaft 110 may be inserted a dental drill in a collet _chuck's the generally is designated by the numeral 113. the chuck is conical at both ends and is provided with grooves 115 which extend from each end of the chuck in the axial direction towards "" - its center. The chuck acts twice and encompasses the shaft 110 essentially along two circles of contact.

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The head piece lli is with an external thread, like "Ibei 114 shown, in which one end of a sleeve / 116 einew screws, the outside with circumferential grooves, as at 117 is provided for the hands of the "dentist. Auf a mounting clamp is attached to the other end of the sleeve 116 » slid and freely rotatable, generally with the number. 118 is designated »

In the interior of the sleeve 116 is an intermediate shaft 119 stored in roller bearings 121 and -122, which are from the inside » jacket of the sleeve are worn * The sleeve 116 is at the front End with an internal thread 123 for receiving one of the intermediate shaft 119 freestanding hollow tube 124 Vere see. The banjo bolt 124 has key openings and presses against the outer race 126 of the rolling bearing "121., while the inner race of this rolling bearing has a «-» - placed shoulder 128 of the intermediate shaft 119 is applied «■

A hollow screw I3I with a thread on the outside is screwed into the * assembly clamp 118 free-standing from the intermediate shaft II9 \ the assembly clamp II8 has an internal thread I32 for this purpose 133 of the roller bearing 122, while the inner race 134 is against «ine & sfe ± a shoulder I36

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supported on the intermediate shaft 119. By the means described in this way, the intermediate shaft 119.: -'- by means of the banjo bolts 123 and 13I is rigidly braced inside the sleeve Ho, but rotatably braced against it.

The front end of the intermediate shaft II9 has © in External thread, as shown at l4l, for receiving a Screw head 142 with an internal cone ** l43 "

The chuck 113.- is inside the "screw head ..

142 and the intermediate shaft 119.and der.innen «ν cone 143 includes the outer kpxms-. de.s- chuck so that with pressure exerted on the chuck in the left direction, according to the view in FIG. 2, between the inner cone

143 of the screw head and the outer cone of the chuck Pressure arises. The grooves 115 between the jaws of the chuck are pressed together. where the. Bake "the Grasp the shank 110 of the dental drill.

A collet chuck 149 arranged inside the intermediate shaft II9 has at the front end an inner cone I50 which grips the rear outer cosius of the chuck 113. vzm ** . When pressure is exerted on the collet chuck 149, to the left according to the view in FIG. 2, the inner cone 150 of the collet chuck 149 runs onto the rear outer cone of the chuck 113 and simultaneously with this pressure

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the chuck relative to the screw head l42 according to: shifted to the left so that both Koaen .of the chuck be pressed against the shaft 110 of the cutting instrument "

The collet chuck naturally rotates with the intermediate ** ■ shaft 119 «The shaft of the collet chuck 149 has" on the down * " cut l6l tapered diameter, creating.a shoulder 162 arises, against which one end of a screw » benfeder 1Ö3 sets. The counter pressure bearing 164 has a Annular groove 166 for receiving the ends of screws "16 7, which are shown in Threaded holes in the jacket of the intermediate shaft 119 «* are screwed.

The tapered section! Oil of the shaft of the - pliers «»

Chuck 149 penetrates the counter-pressure bearing 164 and it extends to the right, according to the view in FIG. 2. The end of the guide protrudes into the assembly force. and is provided with a screwdriver slot 171 at the end. The oil section of the shaft of the collet chuck has an external thread I72 at the end for receiving an internal thread on a driven member 173 -Threaded bores of the driven member 173 void are tightened against the end of the collet chuck.

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A release lever is attached to the assembly clamp by means of a pin, as shown in FIG. 182, on the stub shaft I83. This short stub shaft I83 is connected to a cam disk l84, which has a ground cam surface -1.86 · The stub shaft i83- runs through a 3? Aß "s"-; piece 187, which is fastened in the assembly clamp II8. A. Pin 185 on the stub shaft I8.3 runs in a. Hat of the adapter 187 to hold the individual parts releasably in the position shown.

The assembly clamp j generally with the number -. II8 be * s .. draws, has a cylindischen.Teil 189, the axial Bores 191 and I92 to accommodate the various, before · » parts described above. The hole 191 is as already mentioned, to accommodate the banjo bolts 13-1 with provided with an internal thread, and is, in front of the ßewindegänge Deposed to a reduced diameter, creating a shoulder 190 is formed on which an annular collar of the Sleeve Ho rests. The roller bearing 122 also has annular collar that rests on the end of the sleeve -.116, and the individual parts are as shown in FIG the banjo screw 13I is fixed in its position. As from the previous * · ' upright, the © MontagezwingenII8 can be freely rotated arranged on the sleeve. The reason for the rotation-free «=» " Order is to force the assembly to be rotatable » possible if the air "and water connections to the pressure"

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The air motor is live. This voltage could be. the Handling by impairing the dentist if the -, .- freedom of rotation would not be provided.

The driven member 173 has a pressure surface 193 against which the cam disk 184 can act when the euro disk is rotated so that. the ground curve surface with the highest point - the curve against the. Pressure "area I93 directed _eats} is the chuck, according to is the view in Figure 2, right _s moved with the spring stretched 163 and bsw released the chuck 113, gee opens. To clamp the stock, the. Release lever I81 rotated, the cam 184 releasing the member 173 and the spring I63 being relaxed. The collet chuck 149 is displaced under spring pressure, as a result of which, as described above, the chuck is clamped around the tool shank. The reason for the flat curve of the cam disk 184 is to prevent sudden relaxation of the spring -163-with certainty and to relieve the dentist from exerting constant pressure on the release lever to relax the spring force »-". - "

The mounting clamp 118 has an opening 194 through which the. Locking screws I76 are accessible. After loosening the locking screws, the powered can

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Link 173 can be removed from the assembly & handpiece by ^: removing it from the end of the pliers chuck, "Before doing this, the handpiece" is detached from the motor of FIG. 1, as will be described below *

After removing the driven member 173 from the end of the collet chuck, alternatively another driven member, generally designated by the number 198 ^: which is designed similarly to the member 173, - can be attached to the extended end of the collet chuck to be screwed on. This alternative driven member 198 is shown in FIG. The only difference between the members 173und I98 is the "that the two claws 201 are arranged on the member 173 on the periphery of a larger body ₅ as the ent" *. speaking claws 2 © 4 on the driven link I98 »

The end of the mounting ferrule IIS is provided an externally threaded at 203 Hiit, so that the motor housing 11 can be screwed into the internal thread 12, the Str8 ^««. Mung motor and the reduction gear surrounds "With the arrangement according to Figure 2 attack DIE claws 2Ol in the claws 88 of the cage ring in the reduction gear ice. The drill is then driven at low speed. When the link 198 of FIG. 3 is screwed onto the end of the oil of the collet chuck, its claws 204 stand with a pin 206 (FIG. 1) at the end of the shaft. 58 ^{: of} the air motor

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engaged. The drill is then directly used with you on the shaft driven relatively high speed.

been
Bs is already. MentionV that a foot switch controls the pressure

the one flowing into the air motor. Air controlled " ^: If the air pressure is changed, the speed of the pressure" air motor can be changed "If the drive element 173 is used, a lower speed can be set. When using the drive member shown in Figure 3, a higher speed range can be set. Speed changes within λ of a range are set with the foot switch. In this way, the dentist can regulate the speed and torque and adapt them to the operating conditions. When screwing the drive members 173 or onto the extended end of the shaft 161 of the collet chuck ^ - the distance between the cam disk 184 and the pressure surface 193 can be adjusted to the desired amount close the chuck with a variable * force.

Although a preferred export in the drawing Approximate form of the subject matter of the invention shown and described above can of course be various

kl «28

Modifications and changes, particularly in the shape and position of the parts, can be made without being taken from the original concept. to deviate as it is laid down in the attached claims ..

Claims (11)

May 1968 Protection claims - - ■ _: '= .-. - 1 «Drive unit with fluid flow motor for driving dental tools such as drills, cutting tools and grinding wheels, both with reduced and undiminished speed, characterized by a roller bearing (i8) acting as a reduction gear with an asially elongated coupling (88) at its free end. for the; Connection of the cage ring (84) formed by the mechanism, its inner race {8J) in the circumferential direction. bar shaft of the rotor (26) des.Strömungsinotors (1?) is connected, the outer race (Si) of which is non-rotatably arranged, and by means for mutual axial displacement of the inner and outer run rings' for the purpose of "change .; · the frictional resistance in the rebate bearing (i8)". 2. Drive unit according to claim 1 ,. marked by an additional one at the output end (58th) - the runners shaft arranged coupling (: 206) for direct connection of the tools to the shaft of the rotor (2β) ο 3. Drive unit according to claims 1 and 2, ge »denotes _v by two each by an adjusting screw (73 * 95) ^to ** change their" spring force resilient over ^; 1234/64 Intermediate members (64, 98) in-opposite ,, axial Spring elements (69, 104) acting in the direction of the shaft of the rotor (26) with sliding vanes (28). through the the runner in the adjusted state "in operating position" * and the required friction resistance in the rolling bearing * (l8) for the transmission of a rotary movement; more selected Speed on the cage ring (84) and the -an this ^ closed tool is created » 4. Drive unit according to claims 1 to 3V S ^e ' ^w indicates, - -by "one of the inner" race C83) of the roller bearing (l8) lying laterally, -' on the output «» end (58) of the rotor shaft reared ring (93) j of a shaft of the rotor (26) at its the Äbtriebsende (58) opposite the end supporting roller bearing (62) _s with its inner race (68) "of a shoulder (67) der.Lau" * ferwelle and from one of the outer ⁷ race rings (GS) of the roller bearing (62), laterally abutting washer (64), the existing kinematic chain, which by the Jm © bull screw (73) in the as- helical spring formed 'spring element (69) to the inner race (83), while the force created by the adjusting screw (95) in the opposite direction indirectly on the outer race * (8.1 -) * "of the roller bearing (l8 ) works. '".;. ■' ■■■ .-:. 1234/64 ■ '. 5 · Drive unit according to claims i to 4 $ dae by in that the stands hem about the "as ^ Lens" from * formed intermediate member! 98) on the sliding leaf. '{28) spring element acting (1Θ4) from a set TeHerfedern and is tightened by the adjusting screw (95) over the outer race (8l) and a spacer ring C97 ")» 6. Drive unit according to claims .1 to 5Y gee known by one-the output end £ 58) radial by * ».. urgent »with its free ends, in two on the inside * area of the inner baptismal ring .- (83 "). foreseen * guideSe» slot (9I) guided pin 192) * through which the inner The raceway (83) is positively connected to the extended output end (58) in the circumferential direction. 7 · Drive unit according to "Claims 1 to 6, since« * - " characterized by - that - the 'cage ring {84) at its ver * »-. elongated end provided with a plurality of claws (88) is, in the corresponding claws (201) one with under « set speed of the tool to be operated " 8. A drive assembly according to claim S, characterized _t by a _the free driven end (58) of the rotor shaft "-" radially penetrating and on both sides superior pin (206) with its free ends, ie the entsprecheixd from "formed counterpart (204) of a with the speed of the heel (2: 6) to enterJ-b.endm ¥ toolB intervenes. ■ ■■■■■. - ■■ '-. ■■■ ·. ■■ = ■■■■■■ -' ■ -.y ; ' . ''. : '' ■ '_' 1234/64 9 drive unit according to claims 1 to 8, characterized in that the eccentric within the Housing (21) mounted rotors (26) of the flow motor (17) with 'a plurality of axially parallel-arranged nuts {27) four «» - can be seen, in each of which a radially slidable sliding wing (28) is arranged, "which during operation with its outer edge (29) slides sealingly along the inner wall (23) of the housing (21) due to the centrifugal force « 10. Drive unit .according to claims 1 to 9 «da« characterized in that the flow motor ". (- 17) on his the end face opposite the output side {37) -with two, the running of the motor in both directions of rotation-errnög «* heights Entrance channels "(41, 42) and an Austrittska® ':.' nal (44) "for the printing medium driving the engine see is. 11. Drive unit according to claims 1 to 10, characterized by two ₄ each, ~ with one "of the two inlet" channels (4l, 42) in connection, "for acceleration; _{the pressure medium guides (52 S} 53) provided for the start-up process ^: which end in the area of the footsteps of the grooves (27) «