Intеrlосk dеviсе fоr prеvеnting rоtаtiоn оf shаft, usеd fоr е.g. dеntаl tооls, соmprisеs lосking pin suppоrtеd in rесеssеd slidе surfасе in shаft

The available invention concerns a rotation barrier in the range of two separately, from each other independent waves or wave parts for the prevention of unwanted rotation of a wave or a wave part. Such rotation barriers can be used in different devices, in which a tool is propelled over waves. As a possible area of application, which however under no circumstances when restriction of the possible areas of application is to be understood, in the following the rotation barrier according to invention in Handund elbows for dentale, preventive applications presented. A goal of the preventive dentistry, the so-called dentalen prophylaxis, is preventing all tooth, Mundund Kieferkrankheiten. Apart from the individual prophylaxis (among other things tooth flashes at home) also the dentist accomplishes preventive treatments, for example removing from tartar, surfaces, discolorations or polishing the tooth surface. The latter is accomplished usually with special instruments, e.g. prophylaxis elbows, and specific tools, e.g. caps, Prophy Cups so called, or brushes. They are fastened over a tool clutch in the head of the elbow and propelled over one or more waves, which stands with an engine in connection. The used tools exhibit turned side a pin with thread for attachment at their the elbow head. This pin is screwed into the upper impulse (the Kupplungswelle) with an appropriate thread. The upper impulse stands over at least a further wave with the engine in connection, so that with enterprise of the engine the Prophy Cup is shifted in rotation. Over a safe enterprise to ensure the Prophy Cup must be firmly connected with the elbow on the one hand, on the other hand one it is to be able to be exchanged rapidly and simply. This is for hygenic reasons necessarily, since an exchange is to take place at least between treatments at different patients, partially in addition, during a treatment 2s at the same patient occurs. Removing of the tool proves with elbows present on the market however as very difficult: Inserting the tool into the clutch takes place against the rotation direction of the waves. This is to be prevented necessarily around a loosening (unscrew) of the tool from the clutch during the enterprise, since with the pressure on the treatment surface during application and the friction forces resulting from it the Prophy Cup is braked and more slowly rotates than the Kupplungswelle. Inserting the tool into the clutch against the rotation direction of the waves means however again that the tool is continued to screw during the treatment often still into the clutch and that for the loosening of the tool this must be turned into the same direction as the wave during the enterprise rotary. Necessary Kraft around the tool sitting very firmly at the end of the treatment to unscrew thereby gröl it is as Kraft those is necessary often to move the drive shafts. With the attempt the tool with the hand from the clutch to turn rotates the user from there very often only the waves without the tool to solve. Treatment paste, which sticks after the treatment on the tool and makes this slippery, makes still additionally the loosening of the tool to the user more difficult. In the disclosure writing WHERE 99/12491 A1 a device described prevented that with the loosening of the tool the drive shaft corotates. In an axial shift storage with spiral drilling, appropriate around the rear drive shaft part, a pin radially distant from the front wave part is led. To solve with the attempt the tool and to the rotation of the front wave part caused thereby the pin turned to it in the highest place of the spiral drilling lines up. Thus it comes to an axial shift of the two wave parts and/or extension of the wave, which presses thereby against the both bearings. The resistance developed thereby is enough to prevent and the tool from the clutch to loosen be able the rotation from the wave. like that unfavorable during this device is the strong load of the camps caused by the axial shift of the wave parts. With Kugellagem the roll elements are pressed into the races, whereby the operating attitude is worsened. Repetitive load leads finally to the destruction of the camps, connected with zeitund costly service and exchange. From there the task is appropriate for the available invention at the basis an improved device for the prevention of an unwanted rotation of the waves e.g. with the loosening of a tool from 2 RKs 411,569 B of the clutch to create. This task is solved in accordance with the available invention by a rotation barrier with the characteristics of the requirement 1. The rotation barrier according to invention according to requirement 1 exhibits a stop, which is shifted with the s loosening of the tool and by the unwanted rotation of the waves caused thereby radially (related to the axle of the waves) and a further rotation of the waves prevented. In the resting position (during the enterprise of the Handoder of elbow) the stop is on a flattened range of a wave. With the loosening of the tool turns the wave under the SperTstift to these from the flattened range displaced, so that radially outward verlalO gert and against a equipmentfirm construction unit (e.g. the bearing sleeve of the transmission, in which the rotation barrier is built) is pressed. Prevented over this resistance will a further rotation of the wave and the tool can from the clutch be solved. The tool from the clutch can be loosened by this rotation barrier, without for it an extension of the drive shaft is necessary, the strong load of the camps caused. is the invention is described in the following on the basis a preferential remark example and purchase taking on the attached designs: Figure 1 shows as explosion representation the structure of a prophylaxis elbow figure 2 shows a prophylaxis elbow with an axial sectional view of the Getnebes and the rotation barrier according to invention figure 3 shows the rear impulse wave part of the rotation barrier according to invention Figur4 shows a rotation barrier according to invention figure 5a shows in the cross section the rotation barrier according to invention in resting position figure 5b shows in the cross section the erflndungsgemäße rotation barrier in locking position (blockade of the unwanted rotation) figures 6A - C show preferential forms of the shift surface of the rotation barrier according to invention with all figures are beschdftet same construction units with the same numbers. The prophylaxis elbow 1 represented in figure 1 consists the rotation barrier according to invention of a heading 10 with in the head integrated the tool clutch 16, a grip sleeve 11, the transmission 12, in that is contained and an air motor 13. Over a clutch 14 with screw connections 15 for the connection to a distance piece or a supply hose the air motor 13 with compressed air is subjected. In the transmission 12 as well as in the Gdffhülse 11 and in the heading 10 several waves (not represented) are contained, those the rotation of the air motor on the tool, e.g. a Prophy Cup (not represented), which is screwed before beginning of the 3s application into the tool clutch 16, transfer. Instead of the air motor 13 also different motor types can be used for the drive of the tool. In accordance with by means of the supply hose according to the used engine the suitable driving power (e.g. electric current, compressed air, under pressure set gases o.a.) is promoted. Since these drive systems as state of the art to a specialist for medical technology admits are, with it one does not deal more in greater detail. Figure 2 shows in the grip sleeve 11 of the prophylaxis elbow 1 stored transmission 12 with the rotation barrier according to invention 23 on axial average. The rear and front impulse wave part of 22 and/or 21 is propelled over a planetary gear 24 by the air motor 13. In place of a planetary gear also every other suitable transmission can be used. 4s the both bearings 30 and 31, prefers ball bearings, serves the storage of the impulse wave parts of 21 and 22. Over the gear wheel 25 with enterprise of the engine the rotation of the impulse wave parts of 21 and 22 to average-rubbed 26 transferred. In the contact range of the rear and front impulse wave parts of 22 and 21 is the rotation barrier 23. A bearing sleeve 27 encloses the transmission 12. The bearing sleeve 27 serves, as in the following is described, so the rotation barrier 23 still exactly also as counter bearing, if the user loosens a tool from the clutch. In the figures the rotation barrier according to invention is in detail represented 3 and 4. The stop 40 stores on a shift surface 44 of the rear impulse wave part 22. The shift surface 44 extends in a preferential remark example over about a quarter of the range of the impulse wave part of 22, it can however everyone the corresponding operational principle of the Erfinss dung serving dimension amount to. The form of the shift surface 44 is in one particularly RK 411,569 B preferred remark example evenly (see figure 5a and 5b), can however also different one e.g. curved or the corresponding operational principle of the invention serving forms exhibit, preferential forms are shown in the figures 6A - C: Figure 6A shows the even execution, which is to be manufactured in terms of production engineering very simply, figure 6B a concave execution and s figure 6C a stage form, with which due to the flowing transition of the shift surface 44 to the not deepened or flattened part of the rear impulse wave part of 22 the operation becomes more low-friction. Over a parting 41 and therein intervening feather/spring 42 is positioned the stop 40 on the Verschiebefiäche 44. A further pin 43 stands radially from the rear impulse wave part of 22 away. Over the only partly represented planetary gear 24 the rear lo TriebwellenteU 22 with the air motor 13 stands in connection. Lock bush 46 connects the rear impulse wave part 22 with the front impulse wave part 21. Pin 43 rises up thereby into a guide groove 47 of the lock bush 46, stop 40 is positioned in a recess 45. The lock bush 46 can be manufactured as own construction unit and be connected afterwards with the front impulse wave part of 21, e.g. by injecting or every other suitable is method. In a preferential remark example the lock bush 46 together with the front impulse wave part 21 is manufactured as a construction unit. Uber the gear wheel 25 during the enterprises the rotation of the engine 13 to average-rubbed 26 transferred. The function mode of the rotation barrier 23 is represented and in the following is described in the figures 5a and 5b. The two cross sections represent the rotation barrier 23 within the range of the cutting plane X in figure 4. With enterprise of the prophylaxis elbow 1 the rear impulse wave part of 22 rotates in the direction represented by the arrow 60 in figure 4 (whereby the selected direction is arbitrary and the operational principle of the rotation barrier is independent 23 of the drive direction). Rotated by the rotation the pin 43 in the guide groove 47 moved to it to the upper end 48 fastens and in the further over the lock bush 46 the front impulse wave part of 21 toward the arrow 61. The stop 40 takes meanwhile its resting position, i.e. it is on the shift surface 44 (see figure 3) and is sunk thereby in the recess of the lock bush 46. This position is represented in figure 5a. If a tool change takes place, then the user must turn the tool into the same direction, as the drive shafts rotate. This means the front impulse wave part 21 and the lock bush 46 rotates in the direction represented by the arrow 61, until the lower end of 49 of the guide groove 47 against the pin 43 is pressed. With the lock bush 46 rotates also the stop 40, which is shifted toward it by the shift surface 44 away on a not flattened or absorbed part of the rear impulse wave part of 22 and pushed at the same time radially (related to the axle of the impulse wave part) from the recess 45 and pressed against a 3s handpiece-firm construction unit, in a preferential remark example the bearing sleeve 27 of the Getdebes 12. This situation is represented in figure 5b. In a preferential remark example the stop is 40 against the bearing sleeve 27 of the transmission 12 presses a recess 48 for engaging the pin attached in the range, in that. In the position represented in figure 5b the stop 40 prevents now the turning of the front impulse wave part of 21 and the users can the tool problem-free from the tool clutch loosen (to unscrew). If the user loosened the tool and exercises thus no more Kraft on the front impulse wave part 21, then the stop 40 is turned by Kraft of the feather/spring 42 the shift surface 44. The invention is limited not to the represented area of application and the descriptive Ausfüh4s rungsbeispiel, but covers all remark possibilities, which do not change operational principle in principle and the corresponding of the invention. In particular can the rotation barrier between all waves or wave parts, which implement themselves between the engine and the work, things to find. Also formation and number of Verschiebefiäche 44 as well as the number of pins 43 and guide grooves 47 are not limited to the examples stated in the description. The geometrical training of the stop 40 knows each form, prefers cylindrical, oval or spherical covering, the one radial misalignment of the stop supported. When counter bearing for the stop can serve 40 each equipmentfirm construction unit of the elbow 1, the range in that the stop 40 against the equipmentfirm construction unit is pressed, can appropriate recesses or surface textures exhibit. RK 411,569 B