Lever actuated chuck mechanism for dental handpiece
AssigneeSybron Corporation
InventorLeonid I. Maizenberg
Life of this patent
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Abstract
In a dental handpiece, a drawback bur chuck actuable to open by a cam lever mounted atop the handpiece head and acting axially downward on the chuck against a spring which urges the chuck upward into clamping engagement with a bur shank when the cam lever is in its closed position. The cam lever is rotatable on the axis of the chuck to a position to suit the convenience of the user. The chuck is removable for cleaning and positive means are provided to prevent over travel of the chuck to thereby prevent its permanent deformation.
Claims8
A chucking mechanism for inclusion in the head of a dental handpiece, said chucking mechanism including a bur tube disposed for rotation within said head, said bur tube having a tapered inner surface along a portion of its length, a drawback chuck disposed within said bur tube for rotation therewith and having a tapered outer surface along a portion of its length to coact with the tapered inner surface of said bur tube, said chuck including a radially extending retaining ring at its top end and a spring operatively disposed between said bur tube and said retaining ring urging said chuck to a clamping position, wherein the improvement comprises:
- a cam lever pivotally mounted relative to said head in operative relationship with the top end of said chuck, said cam lever being reciprocable to an open position to move said chuck to its open position against said spring and to a closed position to return said chuck to its clamping position under the influence of said spring.
Dependencies are inferred from the claim text.