Rotary driving apparatus having a collet with a magnetic latchin

Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool

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279 1M, 279 93, A61C 0000

Patent

active

043782124

ABSTRACT:
A rotary driving apparatus having a collet housing defining a passageway which is adapted to receive, engage and rotate a bur having one end thereof which terminates in a notched bur key formed of a magnetizable material having a driving shaft having a first end and a second end which is rotatably supported in a collet housng with the first end of the driving shaft operatively coupled to and rotated by a rotary driving motor and with the second end of the driving shaft positioned within the collet housing passageway and being adapted to receive the bur and to engage and rotate the end of the bur which terminates in a notched bur key formed of a magnetizable material and wherein the second end of the driving shaft includes a cylindrically shaped housing defining a capture cavity and side walls which form a slotted opening which communicates with the capture cavity and with the collet housing passageway to receive and pass the notched bur key end of a bur transported within the collet passageway and to position the notched bur key end adjacent the slotted opening such that rotation of the driving shaft urges the side walls forming the slotted opening into removable driving engagement with the notched bur key end and wherein a magnet is located within the capture cavity for establishing a magnetic field which encloses the slotted opening and which has a flux density of sufficient magnitude to magnetically couple the magnetizable material forming the notched bur key end to removably hold the notched bur key end of the bur within the slotted opening independent of the driving engagement between the side walls forming the slotted opening and the notch of the notched bur key end is shown.

REFERENCES:
patent: 1824509 (1931-09-01), Snader
patent: 2051718 (1936-08-01), Kalfenbach et al.
patent: 2550775 (1957-05-01), Clark

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