Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1997-04-02
1998-03-24
Lucchesi, Nicholas D.
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
433129, A61C 114
Patent
active
057305960
ABSTRACT:
A dental instrument holder (10) comprises a clamping sleeve (28) having two cylindrical annular closed bearing regions (50, 52) axially spaced apart is arranged in the driven hollow shaft (22) accommodating the dental instrument. A spring-loaded clamping region (56) is located between these cylindrical bearing regions (52, 54), which clamping region preferably has two spring tongues (62, 64) partitioned by a U-shaped incision or indent (58, 60) from the clamping sleeve (28). The clamping sleeve (28) and the structural part (22) adjacent thereto may execute a relative axial movement between two positions: in the first, the clamping position, the elastically spring-loaded clamping region (56) of the clamping sleeve (28) is pressed radially inwards by a conical actuating surface (70) provided on the structural part (22). In the other relative position, the release position, the spring-loaded clamping region (56) of the clamping sleeve (28) can disengage so that the shank of a dental instrument accommodated therein can thereby be released. The two bearing regions (50, 52) that are provided on both sides of the elastic clamping region (56) of the clamping sleeve no longer perform a bearing function, with the result that the bearing and mounting of the dental instrument within the head of the dental instrument holder (10) is more precise, imbalances and eccentricities are avoided, and in this way damage to the bearings (24, 26) of the hollow shaft (22) as well as to the dental instrument itself are largely excluded.
REFERENCES:
patent: 4436512 (1984-03-01), Garcia
patent: 4536157 (1985-08-01), Maizenberg
patent: 4611990 (1986-09-01), Lares et al.
patent: 5254004 (1993-10-01), Feldman et al.
patent: 5383785 (1995-01-01), Brugger
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