US 4,820,154 AGranted

Dental instrument with a tool for treating the teeth

AssigneesLudwig Romhild, Peter Reinhard

InventorsLudwig Romhild, Erwin Hartmann, Peter Reinhard

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Abstract

A dental instrument employs a tool having an upper portion for use in contacting teeth and a lower portion defining a shank with a lower end, a hollow elongated gripping holder having an opening at one end, a device in the holder communicating with the opening in the holder to removably receive said part of the shank, including the lower end; and a manually operated coupling mechanism having a first section connected to the holder and a second section on the shaft, the mechanism having a lock position at which the first section engages the second section in such a manner that the tool is locked in the holder in position for use, and having a release position at which the first and second sections are disengaging and the tool can be removed from the holder.

Claims17

Dependent claims

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.

5 more elements

A dental instrument comprising:

a tool having an upper portion for use in contacting teeth and a lower portion defining a shank;
a hollow elongated gripping shaft having an opening at one end;
tool receiving chuck means provided in said shaft to removably receive said shank;
coupling means including a coupling pin positioned in said chuck means, a control sleeve displaceably mounted on said chuck means and cooperating with said coupling pin, and an actuating sleeve cooperating with said control sleeve to move said coupling pin for coupling said chuck means with said tool and said control sleeve in a lock position in such a manner that the tool is locked immovably in said chuck means in position for use and releasing said chuck means from said control sleeve in a release position at which the tool can be removed from the chuck means;
and
manually operated push-button means provided on said gripping shaft and operated to act on said actuating sleeve to displace said control sleeve so as to enable said chuck means which is normally in said lock position to be placed in said release position.

3 more elements

Dependencies are inferred from the claim text.