Illumination – With implement or hand held holder therefor – Hand tool
Patent
1986-01-16
1987-02-10
Nelli, Raymond A.
Illumination
With implement or hand held holder therefor
Hand tool
433 29, 433114, A61C 100, A61C 300
Patent
active
046427384
ABSTRACT:
A pneumatic dental drill handpiece has a light-bulb (40) fastened in its head, so directed that it illuminates the tip of the burr (32). An electric cell (2) is positioned in a semicylindrical chamber (15) located in the rear part (10) of the handpiece casing; the chamber is eccentric to the axis of the casing and is accessible through an opening therein, this opening being closed by a thin sleeve (9) slidable on the rear part. Ducts for admission of air (13) and water (12) extend through a channel (17) in the portion of the casing opposite the opening. Electric contact between the front pole of the cell (2) and one terminal of the bulb (40) is made by a conductor wire (21) passing through the hollow front part (20), and between the rear pole of the cell and the second terminal of the bulb through the anodized aluminum parts (10) and (20) of the casing. The aluminum parts are conductively connected through non-anodized contacting surfaces.
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