JPS6141576B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coupling mechanism for releasably coupling a medical, particularly dental, handpiece having a drivable tool to a drive part, which an axial notch is formed in the second part which is insertable onto the first part of the second part, and a sliding coupling sleeve which is insertable into the notch is disposed in the first part. , around this sliding sleeve there is arranged at least one connecting ring which is freely rotatable in the connected state of the two parts and is axially secured and radially elastic; of the type in which the respective connecting parts are radially elastically abutted against a predetermined partial area of the inner wall of the second part in such a way that they can be separated by pulling apart in the axial direction; related to things.

A coupling mechanism of the above type is known from German Patent No. 21 52 320. In this known example, the frictional connection between the coupling ring of the first part and the inner wall of the axial recess of the second part is overcome when the two parts are pulled out in order to separate them. only is required. However, in this construction, the frictional connection in question can be released or reduced in an involuntary manner, for example due to vibrations of the two connected parts, thereby causing the two parts to become unintentionally separated. do. Furthermore, when the two parts are inserted, it is difficult to detect whether the final connected position has been reached, ie, the position in which the drive part is operatively connected to the tool of the handpiece.

It is an object of the invention to eliminate each of the above-mentioned disadvantages, and it is an object according to the invention that the connecting ring secures the pluggable second part axially against inadvertent dissociation. while being coupled in a mating manner to the second portion by a locking device;
The locking device abuts against the edge of the annular projection provided on the inner wall of the second portion facing radially inward, located on the side in the direction of the dissociation movement, and the edge of the coupling ring. The solution is that the outer conical transition section is formed by an outer conical transition section.

The main advantage according to the invention is that due to the mating connection formed between the coupling ring of the first part and the second part, the connection between said coupling ring and the second part when vibrations occur. A release or reduction of the frictional connection is prevented, and thus an involuntary disassociation of the two connected parts is avoided, nevertheless, upon actuation of their desired separation by withdrawal of the two connected parts, said frictional connection or A given mating connection can be overcome and released in a simple manner. Furthermore, during the insertion process of the two parts, a stop-like effect is formed when a mating connection is achieved by the locking in question, which also ensures a satisfactory working connection between the tool and the drive part of the handpiece. Thus, a predetermined assignment relationship is formed between both parts.
Furthermore, an error compensation effect is obtained.

Further advantageous embodiments of the invention are specified in the dependent claims.

The invention will now be explained with reference to the illustrated embodiment.

The drawing shows a coupling mechanism for releasably connecting a bent cylindrical dental handpiece (angle piece) 1 equipped with a drivable tool such as a borer to a cylindrical drive unit 2. has been done. A drive shaft 20 is rotatably supported in the drive part 2 and is driven, for example, by an electric current or an air flow (not shown). A driving body 21 arranged at the driven end of the drive shaft 20
This allows it to be brought into rotational engagement with a corresponding driver 22 of a driven shaft 23 mounted in the handpiece 1. Furthermore, this rotary drive action is caused by the transmission device 2
4 from the driven shaft 23 to the next transmission 2
5 to a shaft 27 supported in the head 26 of the handpiece 1, which shaft 27 is connected to the tool 1.
9 and is releasably and non-rotatably coupled.

A first part of each part 1, 2 to be connected can be inserted into the axial recess 3 of the handpiece 1, which in the illustrated example is the drive part 2, and which is the second part in the illustrated example. A sliding coupling sleeve 4 is arranged, which contains a driving body 21, around which a coupling ring 5 is arranged, which in the coupled state is freely rotatable, axially secured and radially spring-elastic. is installed. This coupling ring 5 is arranged in an annular groove 28 on the outside of the sliding sleeve 4 and, in the coupled state, has a frictional connection and a radially spring-elastic force against a predetermined partial area of the inner wall 6 of the recess 3 of the handpiece 1. The parts 1, 2 thus connected can be separated from each other by pulling apart in the axial direction. The construction of the coupling ring 5 ensures free rotation of the two parts 1, 2 relative to each other in the coupled state.

Moreover, at this time, the connecting ring 5 is connected to the hand piece 1 in a fitting connection while protecting the hand piece 1 inserted onto the sliding coupling sleeve 4 from inadvertent dissociation and securing the hand piece 1 in the axial direction. There is.
A deliberate disassociation of the two parts 1, 2 can be easily carried out by axial pulling apart, overcoming or releasing the mating connection in question.

The above-mentioned mating connection is such that the edge 9 of the annular projection 7 directed radially inwardly from the inner wall 6 of the handpiece 1, located in the direction 8 of the pulling or disengaging movement of the handpiece 1, is connected to the connecting ring 5. , an outer conical transition section 1 tapering in a direction opposite to the dissociation movement direction 8
It is formed by being brought into contact with 0. This facilitates the creation of a self-centering effect. In this case, the partial area of the inner wall 6 that is to be rested by the connecting ring 5 is formed by the inner circumferential surface 11 of the annular projection 7 .

As can be seen in particular from FIG. 2, the conical transition section 10 of the coupling ring 5 is formed by the oblique wall of the V-shaped annular groove 12 of the coupling ring 5, which faces in the direction of disengagement movement 8. , the other oblique wall 13 of this annular groove 12 is shorter than the oblique wall forming the conical transition section 10, and the oblique wall 13 also has an abutment surface on a predetermined partial area of the inner wall 6. The connecting ring end section 15 is formed and has a smaller outer diameter compared to the other sections 14 of the connecting ring 5.
In this case, the remaining section 14 of the connecting ring 5 projects with radial play into an annular groove 16 arranged in the inner wall 6, the limit of which is opposite to the direction of the disengaging movement. The portion is formed by an annular projection 7 of the inner wall 6 which is to form the said mating connection.

The end section 17 of the coupling ring 5 located in the direction of the disengagement movement tapers on its outside to a diameter that is below the diameter of the axial recess 3 of the end of the handpiece 1 opposite to the direction of the dissociation movement. It is formed into a cone shape.

The connecting ring 5 is formed by a slotted elastic ring. The interrupting slit provided for this purpose is designated by the reference numeral 18.

It is also possible within the scope of the invention to carry out an arrangement opposite to the arrangement of the means for forming the mating connection shown.
It is therefore also possible to provide the inner surface of the coupling ring 5 with a conical transition section or a V-shaped annular groove and an end section with a smaller diameter, and to provide the outer wall of the sliding coupling ring 4 with an annular projection. In case,
A coupling ring 5, which is freely rotatable in the coupled state, axially secured and radially elastic, will be arranged along the inner wall 6 of the axial recess 3 of the handpiece 1.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 shows a handpiece and a drive unit according to the present invention.
2 is an enlarged view of the portion shown in FIG. 1, and FIG. 3 is a sectional view taken along the line - in FIG. 1. DESCRIPTION OF SYMBOLS 1... Hand piece, 2... Drive part, 3... Notch, 4... Sliding coupling sleeve, 5... Connection ring, 6... Inner wall, 7... Annular protrusion, 8... Dissociation movement direction, 9... Edge, 10... Transition part, 11...
...Inner peripheral surface, 12, 16, 28... Annular groove, 13...
...slanted wall, 14... section, 15, 17... end section,
18... Interrupted slit, 19... Tool, 20...
Drive shaft, 21...driving body, 22...corresponding driving body,
23... Driven shaft, 24, 25... Transmission device, 2
6...Head, 27...Axle.

Claims (1)

[Scope of Claims] 1. A coupling mechanism for releasably coupling a medical handpiece 1 having a drivable tool 19 to a drive part 2, the first part of both parts to be coupled. An axial recess is formed in the second part 1 which can be inserted onto said first part 2, into which a sliding coupling sleeve 4 which can be inserted is inserted.
At least one connecting ring, which is arranged on the part 2 and is axially secured and radially elastic, is rotatable freely even in the connected state of the two parts 1, 2 and is arranged around the sliding sleeve 4. 5 is arranged, and when the connecting ring 5 is in the connected state, each of the connecting parts 1, 2 is prevented from being pulled apart in the axial direction with respect to a predetermined partial area of the inner wall 6 of the second part 1. In the version in which the coupling ring 5 is radially elastically abutted so as to be releasable, the coupling ring 5 holds the second insertable part 1 in the axial direction against involuntary disengagement. while securing, it is connected in a mating manner with said second part 1 by a locking device, said locking device comprising:
The edge 9 of the annular protrusion 7 provided on the inner wall 6 of the second portion 1 facing radially inward, located on the side in the direction of the dissociation movement, and the connecting ring 5 are brought into contact with the edge 9. A coupling mechanism for a medical handpiece, characterized in that it is formed by an outer conical transition section 10 . 2. The connecting mechanism according to claim 1, wherein the partial range of the inner wall 6 that is to be abutted by the connecting ring 5 is formed by the inner circumferential surface 11 of the annular projection 7. 3 The conical transition section 10 of the coupling ring 5 is formed by the oblique wall of the V-shaped annular groove 12 of the coupling ring, located in the direction of disengagement movement 8, and the other oblique wall of this annular groove 12 The wall 13 is designed to be shorter than the oblique wall forming the conical transition section 10, and the oblique wall 13 forms the abutment surface of the connecting ring 5 on the partial region of the inner wall 6. 3. A coupling mechanism according to claim 1, characterized in that the end section 15 has a smaller outer diameter than the other section 14 of the coupling ring 5. 4 The other section 14 of the connecting ring 5 is the inner wall 6
It protrudes into an annular groove 16 formed in the annular groove 16 , whose limiting part on the side opposite to the direction of disassociation movement is connected to the annular projection 7 of the inner wall 6 to form a mating connection. The connection mechanism according to any one of claims 2 to 3, wherein the connection mechanism is formed as follows. 5. The end section 17 of the coupling ring 5 located in the direction of the disengaging movement is tapered conically on its outside to a diameter smaller than the diameter of the axial recess 3. to 4th
The connection mechanism according to any one of the preceding paragraphs. 6. Connection mechanism according to one of claims 1 to 5, in which the connection ring 5 has an interrupted slit 18.