Dental handpiece comprising torque-limiting means

Details Dental handpiece comprising torque-limiting means Dental handpiece comprising torque-limiting means

2005-09-13

2005-09-13

Bumgarner, Melba (Department: 3732)

Dentistry

Apparatus

Having motor or means to transmit motion from motor to tool

Reexamination Certificate

active

06942485

ABSTRACT:
A dental handpiece is provided including a neck wherein balls are guided in transverse channels of an input shaft and are radially spaced apart by a support piece including a tapered part thrust by a spring. A linking ring is mounted on the end of the input shaft and includes internal longitudinal grooves circular in cross-section and of variable depth along the longitudinal direction. The linking ring is mounted sliding and locked in rotation on an output shaft. Under the action of a resisting torque applied by the tool to the output shaft greater than a predetermined threshold, the linking balls are subjected to a reaction from the internal grooves of the linking ring which tends to bring them closer together, countering the spring. The balls are then released, producing a disengagement which limits the transmitted torque and prevents the tool engaged in the tool-bearing shaft from breaking.

REFERENCES:
patent: 2514227 (1950-07-01), Dodge
patent: 3727432 (1973-04-01), Eaves et al.
patent: 3827260 (1974-08-01), Kato
patent: 3852884 (1974-12-01), Lazarus
patent: 4617837 (1986-10-01), Kataoka et al.
patent: 4861201 (1989-08-01), Cuilleron
patent: 5584689 (1996-12-01), Loge
patent: 5924864 (1999-07-01), Logé et al.
patent: 6176703 (2001-01-01), Gugel et al.
patent: 27 26 325 (1978-12-01), None

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