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Dental instrument with a tool for treating the teeth

  • US 4,820,154 A
  • Filed: 04/01/1987
  • Issued: 04/11/1989
  • Est. Priority Date: 04/02/1986
  • Status: Expired due to Fees
First Claim
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1. A dental instrument comprising:

  • a tool having an upper portion for treating teeth and a lower portion defining a shank;

    a hollow elongated gripping shaft;

    an elongated rod positioned in said shaft and having at an upper end thereof a chuck portion removably receiving said shank;

    a control sleeve displaceably mounted on said rod, said control sleeve having two longitudinal slots, said chuck portion having a groove;

    a coupling pin situated in said groove and extending into said slots to be moved in said slots in a direction normal to an axis of elongation of said shaft for coupling said chuck portion with and releasing said chuck portion from said control sleeve;

    an actuating sleeve positioned in said shaft and having a flange cooperating with said control sleeve and two arms; and

    an actuating ring disposed on said shaft and having two externally actuated push-buttons cooperating with said arms and operated to release said arms to displace said control sleeve from a coupled position with said chuck portion to a release position from said chuck portion, said shank having a groove-like depression engaging said coupling pin when said chuck portion and said control sleeve are in the coupled position and being disengaged from said coupling pin when said chuck portion and said control sleeve are in the release position.

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