Patent US3809081A successfully refreshed from Google Patents.
US3667125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental handpiece
Assignee: Micro Mega SA
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Filing: 1969-08-29
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Granted: 1972-06-06
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Expires: 1989-08-29
Abstract
Abstract An improved micromotor-driven dental handpiece consists of a cylindrical body which includes an inner sleeve and an outer sleeve slidingly fitting over the inner sleeve, the two sleeves being maintained axially relative to each other. A detent slidingly mounted on the outer sleeve releasably interconnects it with a gripper-locking sleeve and concurrently actuates a mechanism by means of which the shaft of the handpiece may be intercoupled with the inner sleeve, whereupon the locking or releasing of the cutting tool is effected by turning the outer and inner sleeve relatively to each other.
Inventors
- 👤 Michel Seigneurin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:12
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/08; A61C1/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
214 words
In a dental handpiece for connection to a micromotor, a casing comprising a normally stationary outer casing sleeve providing a hand grip for the handpiece and an inner casing sleeve rotatably disposed partly in said outer casing sleeve and having a portion extending beyond an end of said outer casing sleeve, a shaft rotatably supported in said inner casing sleeve for rotation relative to both of said casing sleeves, means for releasably connecting said casing to a micromotor having a rotor, means for coupling one end of said shaft to the rotor of said micromotor for rotation inside said casing, means at the other end of said shaft for holding a tool, said tool holding means comprising a locking sleeve rotatable relative to said shaft in one direction to secure a tool and in the opposite direction to release a tool, and means operable from outside said casing for temporarily connecting said locking sleeve for rotation with one of said casing sleeve and at the same time for temporarily connecting said shaft for rotation with the other of said casing sleeves, whereby said locking sleeve and said shaft are rotatable relative to one another to secure or release a tool by manual rotation of said inner casing sleeve relative to said outer casing sleeve.
Claim 2
Dependent Claim
214 words
In a dental handpiece for connection to a micromotor, a casing comprising a normally stationary outer casing sleeve providing a hand grip for the handpiece and an inner casing sleeve rotatably disposed partly in said outer casing sleeve and having a portion extending beyond an end of said outer casing sleeve, a shaft rotatably supported in said inner casing sleeve for rotation relative to both of said casing sleeves, means for releasably connecting said casing to a micromotor having a rotor, means for coupling one end of said shaft to the rotor of said micromotor for rotation inside said casing, means at the other end of said shaft for holding a tool, said tool holding means comprising a locking sleeve rotatable relative to said shaft in one direction to secure a tool and in the opposite direction to release a tool, and means operable from outside said casing for temporarily connecting said locking sleeve for rotation with one of said casing sleeve and at the same time for temporarily connecting said shaft for rotation with the other of said casing sleeves, whereby said locking sleeve and said shaft are rotatable relative to one another to secure or release a tool by manual rotation of said inner casing sleeve relative to said outer casing sleeve.
Claim 3
Dependent Claim
79 words
A dental handpiece according to claim 1, in which said temporary connecting means comprises teeth on said locking sleeve, detent means on the outside of said outer casing sleeve movable axially of said outer casing sleeve, and a pin extending Inwardly from said detent means in position to engage said teeth on said locking sleeve when said detent means is moved axially of said outer casing sleeve to connect said locking sleeve for rotation with said outer casing sleeve.
Claim 4
Dependent Claim
67 words
A dental handpiece according to claim 1, in which said temporary connecting means comprises a connecting sleeve inside said outer casing sleeve and cooperating means on said shaft and said inner casing sleeve, said connecting sleeve being movable axially between a position in which it connects said shaft for rotation with said inner casing sleeve and a position in which said shaft and inner casing are disconnected.
Claim 5
Dependent Claim
29 words
A dental handpiece according to claim 2, comprising spring means for biasing said connecting sleeve to a position in which said shaft and said inner casing sleeve are disconnected.
Claim 6
Dependent Claim
58 words
A dental handpiece according to claim 2, in which said inner casing sleeve and said shaft are provided with teeth and in which said connecting sleeve has teeth engageable with said teeth of said shaft and said inner casing sleeve when said connecting sleeve is moved axially to a position for connecting said shaft and inner casing sleeve.
Claim 7
Dependent Claim
106 words
A dental handpiece according to claim 2, in which said temporary connecting means comprises a connecting sleeve inside said outer casing sleeve and cooperating means on said shaft and said inner casing sleeve, said connecting sleeve being movable axially between a connecting position in which it connects said shaft for rotation with said inner casing sleeve and a released position in which said shaft and inner casing sleeve are disconnected, and means associated with said detent means for moving said connecting sleeve from released to connecting positions when said detent means is moved axially to connect said locking sleeve for rotation with said outer casing sleeve.
Claim 8
Dependent Claim
34 words
A dental handpiece according to claim 6, in which said means associated with said detent means comprises an inner sliding ring slidable axially inside said outer casing sleeve and connected to said detent means.
Claim 9
Dependent Claim
65 words
A dental handpiece according to claim 1, in which said outer casing sleeve has an inner circumferential groove and said inner casing sleeve has an outer circumferential groove registering with said groove of said outer casing sleeve and in which a locking spring disposed in said grooves connects said inner and outer casing sleeves to lock them against relative axial movement while permitting relative rotation.
Claim 10
Dependent Claim
46 words
A dental handpiece according to claim 8, in which said outer casing has a hole opening into said groove for insertion of an instrument for engagement with said locking spring to depress said spring and thereby release said outer casing sleeve from said inner casing sleeve.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |