Patent US4642738A successfully refreshed from Google Patents.
US4642738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminated dental drill
Assignee: Individual
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Filing: 1986-01-16
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Granted: 1987-02-10
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Expires: 2006-01-16
Abstract
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.
Inventors
- 👤 Moshe Meller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:37
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/08; A61C1/088
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
204 words
Illuminating means for a high-speed drill handpiece, said handpiece comprising an oblong casing in the shape of a cylindrical rear part and a front part, an air-propelled turbine wheel positioned in said front part adapted to drive a burr directly connected to said turbine wheel, and air- and water-duct means, extending from said rear part to said front part, said illuminating means comprising: a light source positioned in said front part in a position effecting light rays to be directed towards the tip of said burr; an electric cell exchangeably placed in a chamber in the cylindrical rear part of said casing, said chamber being positioned eccentrically to the axis of said rear part and being openable through the cylindrical periphery of said rear part, permitting sideways insertion and removal of said electric cell; a first contact point mounted in the rear of said chamber adapted to contact the rear terminal of said electric cell and conductively connected to a first bulb terminal; a second contact point firmly fixed in the front of said chamber and adapted to contact the front terminal of said cell and conductively connected to a second bulb terminal; and switching means adapted to energize or de-energize said light source.
Claim 2
Dependent Claim
204 words
Illuminating means for a high-speed drill handpiece, said handpiece comprising an oblong casing in the shape of a cylindrical rear part and a front part, an air-propelled turbine wheel positioned in said front part adapted to drive a burr directly connected to said turbine wheel, and air- and water-duct means, extending from said rear part to said front part, said illuminating means comprising: a light source positioned in said front part in a position effecting light rays to be directed towards the tip of said burr; an electric cell exchangeably placed in a chamber in the cylindrical rear part of said casing, said chamber being positioned eccentrically to the axis of said rear part and being openable through the cylindrical periphery of said rear part, permitting sideways insertion and removal of said electric cell; a first contact point mounted in the rear of said chamber adapted to contact the rear terminal of said electric cell and conductively connected to a first bulb terminal; a second contact point firmly fixed in the front of said chamber and adapted to contact the front terminal of said cell and conductively connected to a second bulb terminal; and switching means adapted to energize or de-energize said light source.
Claim 3
Dependent Claim
29 words
The illuminating means of claim 1, comprising a cylindrical sleeve movable along said casing rear part and adapted to respectively cover or uncover said chamber containing said electric cell.
Claim 4
Dependent Claim
66 words
The illuminating means of claim 1, wherein said first contact point serves as said switching means in the form of an axially movable piston adapted to be urged in forward direction by pressure of air admitted to said drill to effect contact with said rear terminal of said electric cell, and to be urged in rearward direction by spring means to effect breaking of said contact.
Claim 5
Dependent Claim
51 words
The illuminating means of claim 3, wherein said first contact point is in the shape of a stepped piston adapted to be alternatively urged away from said electric cell in rearward direction by a helical spring, and to be urged towards said cell by air presure acting on its rear face.
Claim 6
Dependent Claim
44 words
The illuminating means of claim 1, wherein said casing is composed of a substantially cylindrical rear part, an angled, hollow intermediate part, and a front part containing said turbine wheel, said burr and said light source, said three parts being firmly and conductivly connected.
Claim 7
Dependent Claim
48 words
The illuminating means of claim 5, wherein said rear part contains said cell chamber of semicircular cross section, open towards the periphery of said cylindrical rear part, and wherein said rear part is recessed to form an internal, longitudinal channel opposite the open portion of said cell chamber.
Claim 8
Dependent Claim
54 words
The illuminating means of claim 6, wherein said air- and water-ducts are in the form of tubes communicating with the respective air and water inlet pipes at the rear end of said casing and extending towards the front of said casing inside said longitudinal channel and through the hollow portion of said intermediate part.
Claim 9
Dependent Claim
15 words
The illuminating means of claim 1, wherein said light source is an incandescent light bulb.
Claim 10
Dependent Claim
44 words
The illuminating means of claim 8, wherein electrical connection between said first contact point and the circumference of said light bulb is formed by the anodized aluminum parts of said casing, said parts being conductively connected through bare, non-anodized surface sections in mutual contact.
Claim 11
Dependent Claim
75 words
The illuminating means of claim 8, wherein said second contact point is conductively connected to the rear terminal of said light bulb by means of a wire conductor extending through the hollow portion of said intermediate part and by means of a helical spring extending between the front end of said wire conductor and a metal sleeve covering a portion of said front part and contacting said bulb with a bare portion of its surface.
Claim 12
Dependent Claim
25 words
The illuminating means of claim 1, wherein said air- and water-duct means are in the form of bores provided in the material of the casing.
References Cited (Backward Citations)
US2226616A
Cited
US2588288A
Cited
US2588559A
Cited
US2673284A
Cited
US2885537A
Cited
US3023306A
Cited
US3109238A
Cited
US3614414A
Cited
US4184196A
Cited
US4195329A
Cited
US4107765A
Cited
US4375964A
Cited
US4230453A
Cited
US4283757A
Cited
US4561845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |