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1. (WO1980000656) INSTRUMENT DENTAIRE ET ASSEMBLAGE DE CARTOUCHE A ROTOR POUR SON REMPLACEMENT
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The Claims

1. A multi-component rotor subassembly for dental handpieces, said subassembly having an .axial opening therethrough for slidably receiving a spindle of a supporting tool and including as components of said subassembly a rotor, at least one rotor bearing assembly and resilient support ring therefor, and a plastic cup member; said cup member having a flexible and gradually tapered side wall and a centrally apertured end wall; said bearing assembly being received in said cup member, and said resilient support ring being frictionally secured between said bearing assembly and said flexible side wall.

2. The subassembly of Claim 1 in which said side wall is provided with a plurality of circumferentially-spaced notches defining therebetween a plurality of flexible fingers engaging said resilient bearing support ring.

3. The subassembly of Claim 2 in which each of said fingers is provided with a radially inwardly extending lip at the free end thereof, said lips engaging said resilient ring.

4. The subassembly of Claim 1 in which a. compression spring is disposed within said cup member between said end wall and said bearing assembly.

5. The subassembly of Claims 1, 2, 3 or 4 in which said cup member is formed of flexible plastic material.

6. A multi-component rotor replacement subassembly for dental handpieces; said subassembly having an axial opening therethrough for slidably receiving a spindle of a supporting tool and including as components of said subassembly a rotor comprising a bur tube and turbine, a pair of ball bearing assemblies mounted on said rotor, a pair of resilient support rings extending about said bearing assemblies, a stator, and a cup member having a side wall and a centraily-apertured end wall; said side

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" ^N wall having an outer surface tapering gradually in the direction of said end wall; said cup member receiving one of said bearing assemblies and having one of said resilient rings disposed in a state of limited compression between said one bearing assembly and said side wall; said side wall being flexible for yieldable engagement with the inside surface of a handpiece housing into which said replacement subassembly is inserted.

7. The subassembly of Claim 6 in which said side wall of said cup member is provided with a plurality of circumferentially-spaced notches defining therebetween a plurality of flexible fingers integral with the side wall of said cup member; said one resilient ring being directly and forcefully engaged by said fingers and protruding slightly into the notches between said fingers.

8. The subcombination of Claim 6 in which a compression spring is disposed within said cup between said end wall and said one bearing assembly.

9. The subcombination of Claims 6, 7 or 8 in which said cup member is integrally formed of flexible plastic material.

10. The subassembly of Claim 6 in which said stator is annular in configuration and extends about the other of said bearing assemblies; and said other of said resilient rings being interposed between said stator ring and said other bearing assembly.

11. A rotor cartridge replacement assembly for a contra angle dental handpiece, comprising a supporting tool having a spindle and a pair of retaining members; a multi-component rotor subassembly having an axial opening extending therethrough and slidably receiving said spindle; one of said components being a cup member formed of flexible plastic material and disposed at one end of said subassembly; a centrally-apertured disc-shaped threaded cap carried by said spindle at the opposite end of said subassembly; said cap and subassembly being disposed between and engaged by said retaining members; one of said retaining members being removable from said spindle for withdrawing said spindle from said cap and said subassembly after the same has been mounted within a dental handpiece.

12. The assembly of Claim 11 in which said one of said retaining members engages said subassembly; said other of said retaining members being in engagement with said cap; and means provided by said other retaining member and said cap for locking the same against independent relative rotation.

13. The assembly of Claim 12 in which said means includes locking pins extending from said other of said retaining members and received within openings in said other of said retaining members.

14. The assembly of Claim 13 in which said pins also project from said other of said retaining members in a direction away from said cap to provide lungs for engaging and removing the cap of a dental handpiece.

15. The assembly of Claim 11 in which said rotor subassembly also includes as components thereof a rotor, a spaced pair of rotor bearing assemblies, a pair of resilient support rings disposed about said bearing assemblies, and a stator ring; said plastic cup member having a flexible side wall and a bottom wall and receiving therein one of said bearing assemblies; and one of said resilient support rings being disposed between said one bearing assembly and said flexible side wall within said cup member.

16. The assembly of Claim 15 in which said flexible side wall of said cup member has a frusto conical outer surface tapering gradually in a direction away from said cap.

17. The assembly of Claim 16 in which said side wall of said cup member is provided with a plurality of circumferentially-spaced notches defining therebetween a plurality of flexible fingers; said one of said resilient support rings being forceably engaged by said flexible fingers and protruding to a limited extent into the notches between said fingers.

18. A contra angle dental handpiece having a handle and a generally cylindrical head housing, said housing having an enlarged threaded opening at one end and a centrally-apertured end wall at the other, a cap threadedly secured within said opening, and a multi-component rotor cartridge coaxially disposed within said housing, wherein the improvement comprises
said cartridge including a rotor, a pair of rotor bearing assemblies, a pair of resilient support rings for said bearing assemblies, and a cup member; said cup member having a flexible annular side wall and a centrally-apertured end wall; one of said bearing assemblies being disposed within said cup member with one of said resilient support rings tightly fitted between said one bearing assembly and said flexible side wall; said flexible side wall firmly engaging the inner surface of said head housing.

19. The handpiece of Claim 18 in which said side wail of said cup-shaped member is provided with a plurality of circumferentially-spaced notches defining therebetween a plurality of flexible fingers engaging both said one resilient support ring and said inner surface of said head housing.

20. The handpiece of Claim 19 in which said side wall of said cup member has a frusto conical outer surface tapering gradually towards said end wall.

21. The handpiece of Claim 20 in which said taper falls within the range of about 1 to 5 degrees from the axis of said rotor cartridge.

22. The handpiece of Claim 19 in which said one resilient support ring is compressed between said one bearing assembly and said side wall of said cup member and protrudes into said notches between said fingers.

23. The handpiece of Claims 18, 19, 20, or 22 in which said'cup member is formed of flexible plastic material.