Patent US3727312A successfully refreshed from Google Patents.
US3727312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental hand instrument
Assignee: Individual
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Filing: 1971-03-15
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Granted: 1973-04-17
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Expires: 1991-03-15
Abstract
Abstract An improved dental hand instrument is provided having means whereby the head of the instrument can be rotated relative to the body thereof so that a dental work piece projecting from the head can be displaced through an arc and positioned at various angles with respect to the body. In a preferred embodiment, the dental hand instrument is provided with an improved and simplified drive means whereby the number of working parts required to drive a dental work piece secured thereto is significantly reduced.
Inventors
- 👤 J Durante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:11
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/08; A61C1/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
230 words
A dental hand instrument comprising a tubular handle; a hollow head rotatably secured to the upper end of said handle and disposed at an angle with respect to the longitudinal axis of said handle, said head being rotatably secured to said handle by means of mating screw threads in said head and said handle; locking and securing means communicating with said head and said handle to lock and secure said head to said handle through engagement of said locking and securing means with said head in various positions of rotation of said head, said locking and securing means comprising a plurality of spaced notches formed in the threaded portion of said head, a vertical pin means seated in a slot formed in the wall of said handle and positioned such that the upper end of said pin means is in alignment to engage said notches, spring means seated in a recess formed at the lower end of said slot and engaging the lower end of said pin means such that said pin means is constantly urged upwardly by said pin means, said recess communicating with said slot, means secured intermediate the ends of said pin means and extending beyond the outer surface of said handle for manually urging said pin means into and out of engagement with said notches; and, means for mounting a dental work pIece to said head.
Claim 2
Dependent Claim
230 words
A dental hand instrument comprising a tubular handle; a hollow head rotatably secured to the upper end of said handle and disposed at an angle with respect to the longitudinal axis of said handle, said head being rotatably secured to said handle by means of mating screw threads in said head and said handle; locking and securing means communicating with said head and said handle to lock and secure said head to said handle through engagement of said locking and securing means with said head in various positions of rotation of said head, said locking and securing means comprising a plurality of spaced notches formed in the threaded portion of said head, a vertical pin means seated in a slot formed in the wall of said handle and positioned such that the upper end of said pin means is in alignment to engage said notches, spring means seated in a recess formed at the lower end of said slot and engaging the lower end of said pin means such that said pin means is constantly urged upwardly by said pin means, said recess communicating with said slot, means secured intermediate the ends of said pin means and extending beyond the outer surface of said handle for manually urging said pin means into and out of engagement with said notches; and, means for mounting a dental work pIece to said head.
Claim 3
Dependent Claim
82 words
A dental hand instrument as defined in claim 1 wherein the angle at which said head is disposed with respect to the longitudinal axis of said handle is less than about 45* and the angle formed by the intersection of the longitudinal axis of said handle and the axis of a dental work piece mounted to said head when said head has been rotated to its lowermost position is less than the difference between 90* and the angular disposition of said head.
Claim 4
Dependent Claim
24 words
A dental hand instrument as defined in claim 2 wherein the angle at which said head is disposed is from about 30* to 40*.
Claim 5
Dependent Claim
145 words
A dental hand instrument as defined in claim 1 wherein the means for mounting a dental workpiece to said head includes a chuck detachably secured within said head; a face plate having a bore axially formed therein and detachably secured to the front end of said head such that said bore is in alignment with said chuck; means extending within said dental hand instrument adapted to drive said dental workpiece mounted to said head, said drive means comprising a flexible drive shaft carried within a flexible drive sleeve, the upper end of said flexible drive shaft being secured to said chuck and the other end of said flexible drive shaft adapted to be connected to a source of power; and, means for supporting said flexible drive shaft and said flexible drive sleeve within said dental hand instrument throughout all positions of rotation of said head.
Claim 6
Dependent Claim
74 words
A dental hand instrument as defined in claim 4 wherein said support means comprises a disc having a plurality of spaced radial spokes extending inwardly therefrom, said disc being secured within said dental hand instrument in the plane of rotation of said head, the innermost ends of said radial spokes being secured to a universal joint having a split ball in which said flexible drive shaft and said flexible drive sleeve are rotatably secured.
Claim 7
Dependent Claim
111 words
A dental hand instrument as defined in claim 4 wherein the means to drive said dental work piece comprises a pneumatic blade member secured to the innermost side of said chuck; an upper pneumatic conduit supported within said dental instrument, the upper end of said upper pneumatic conduit being positioned such that air under pressure conveyed therethrough is impinged upon said pneumatic blade member; and, a lower pneumatic conduit supported within said dental hand instrument and positioned therein such that its bore communicates with the bore of said upper pneumatic conduit, the lower end of said lower pneumatic conduit being adapted to communicate with a source supply of air under pressure.
Claim 8
Dependent Claim
162 words
A dental hand instrument as defined in claim 6 wherein the means to support said upper and lower pneumatic conduits comprises a pair of discs, one of which secures the lower end of said upper pneumatic conduit and the other of which secures the upper end of said lower pneumatic conduit in the plane of rotation of said head such that the bores of said upper and lower pneumatic conduits communicate with each other throughout all positions of rotation of said head, each of said discs having a plurality of spaced radial spokes extending inwardly therefrom, the inner ends of said spokes in one disc being secured to the lower end of said upper pneumatic conduit and the inner ends of said spokes on the other disc being secured to the upper end of said lower pneumatic conduit, the spaces formed between the spokes in each of said discs providing ports through which air can be exhausted from said dental hand instrument.
References Cited (Backward Citations)
US1688136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |