Handpiece for dental or surgical use with locking mechanism

Details Handpiece for dental or surgical use with locking mechanism Handpiece for dental or surgical use with locking mechanism

2005-02-17

2008-11-11

Bumgarner, Melba (Department: 3732)

Dentistry

Apparatus

Having motor or means to transmit motion from motor to tool

Reexamination Certificate

active

07448870

ABSTRACT:
The handpiece includes at the front a collet arranged for strongly gripping the shank of a removable tool housed in guide bores. The collet includes two or several arms attached to an annular part of the collet to grip the tool shank. Preferably, the collet arms are levers each having a support surface which is far from the jaw and on which a gripping mechanism exerts a force which is multiplied by the lever. The gripping mechanism includes a sliding sleeve having an inner conical surface which produces the force on the collet levers via balls. This arrangement enables a smaller gripping spring to be used, or such spring to be omitted. The balls of the releasing mechanism are guided in helical slots having a flexible lateral strip which holds the gripping mechanism in position via a snap fit.

REFERENCES:
patent: 3488850 (1970-01-01), Lieb et al.
patent: 3631597 (1972-01-01), Lieb et al.
patent: 3902248 (1975-09-01), Bareth
patent: 4260381 (1981-04-01), Eibofner et al.
patent: 6126442 (2000-10-01), Knorpp et al.
patent: 2002/0151902 (2002-10-01), Riedel et al.
patent: 2003/0023256 (2003-01-01), Estes et al.
Office Action issued in corresponding U.S. Appl. No. 11/045,098,dated Mar. 27, 2008.

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