Chuck with a push button release for a dental/medical device

摘要

A medical/dental device is provided which includes a body having a hollow sleeve and a head at an end of the sleeve. The head defines an upwardly opening chamber which receives a chuck. The chuck includes a bur tube which removably receives a medical/dental tool of the latch-shaft type and a push button actuator to release the shaft from the bur tube. The bur tube includes a flexible arm which extends above the bur tube's upper surface and an inwardly extending finger positioned to engage the groove of the shaft. A resilient member (preferably a leaf spring) is received in a transverse slot formed in the top of the bur tube body and is retained in place by a retainer key. The shoulder of the latch-type bur abuts the bottom of the spring to reduce axial play of the bur and to allow for use of non-standard burs in the bur tube. The push button includes a downwardly extending pedestal which engages the arm to move the arm from a first position in which the groove and the finger create an interference fit to prevent the shaft from being removed from the head to a second position in which the finger is disengaged from the groove to allow removal of the shaft.