US3798775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental-surgical drill
Assignee: Individual
•
Filing: 1971-09-27
•
Granted: 1974-03-26
•
Expires: 1991-09-27
Abstract
Abstract A dental-surgical drill is disclosed in which a cutting tool is rotatably driven by an air motor. The air motor includes a rotor shaft having a shaft seal mounted thereon for preventing a majority of the air from leaking therethrough. The rotor shaft extends into a cavity located between the seal and the cutting tool with a vacuum created therein to draw off the small portion of the air leaking past the shaft seal and prevent the air from flowing to the area adjacent the cutting tool. Passageways are also formed in the instrument to enable water to be sprayed into the frontal area of the instrument for cooling and lubricating purposes. A telescoping sleeve is also provided with interlocking means for enabling the cutting tool at the end of the instrument to be easily interchanged.
Inventors
- 👤 T Andrews
- 👤 J Weinberg
- 👤 H Geise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:48
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/02; A61C1/05; A61C1/052; Y; Y10; Y10S; Y10S415/00; Y10S415/904; Y10T; Y10T279/00; Y10T279/34; Y10T279/3431; Y10T279/3451
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
71 words
A dental-surgical drill comprising: a motor housing having a cavity formed therein; a pneumatically driven motor rotatably mounted within said cavity; passageways formed within said housing for communicating with said motor cavity for providing motor fluid to drive said motor; a second passageway in said housing for providing cooling fluid to the frontal area of said drill; and valve means for simultaneously controlling the flow of motive fluid and cooling fluid.
Claim 2
Dependent Claim
71 words
A dental-surgical drill comprising: a motor housing having a cavity formed therein; a pneumatically driven motor rotatably mounted within said cavity; passageways formed within said housing for communicating with said motor cavity for providing motor fluid to drive said motor; a second passageway in said housing for providing cooling fluid to the frontal area of said drill; and valve means for simultaneously controlling the flow of motive fluid and cooling fluid.
Claim 3
Dependent Claim
27 words
The invention of claim 1 wherein said valve means comprises a spool valve reciprocably mounted within a bore, said bore communicating with said first and second passageways.
Claim 4
Dependent Claim
24 words
The invention of claim 2 wherein said spool valve comprises a pair of dam portions, each dam dimensioned to extend over a respective passageway.
Claim 5
Dependent Claim
30 words
The invention of claim 3 wherein said spool valve further comprises a pair of annular cavities located adjacent said dam portions, each cavity dimensioned to extend over a respective passageway.
Claim 6
Dependent Claim
19 words
The invention of claim 4 wherein the dam portions are positioned to extend over both of said passageways simultaneously.
Claim 7
Dependent Claim
34 words
The invention of claim 5 wherein said spool valve is movable to a position wherein said second annular cavity communicates with said second passageway while the first dam portion communicates with said first passageway.
Claim 8
Dependent Claim
30 words
The invention of claim 5 wherein said spool valve is movable to a second position where said first and second annular cavities communicate with said first and second passageways simultaneously.
Claim 9
Dependent Claim
35 words
The invention of claim 2 wherein said spool valve is adapted to be reciprocated by a hand lever pivotally mounted on said housing, said lever having one end engaging the extremity of the spool valve.
Claim 10
Dependent Claim
120 words
A surgical instrument comprising: a housing having a cavity formed therein; a motor rotatably mounted within said cavity, said motor having a shaft extending out of one end of said housing adapted to rotatably drive a tool; means for pneumatically driving said motor with a fluid; means for sealing said motive fluid in the motor housing; means between the shaft housing end and the sealing means for receiving any leakage motive fluid that leaks beyond the sealing means; and means communicating with said leakage receiving means for creating thereat a pressure less than atmospheric to withdraw any motive fluid that leaks into said leakage receiving means whereby motive fluid is prevented from passing into the operative area of the tool.
Claim 11
Dependent Claim
120 words
A surgical instrument comprising: a housing having a cavity formed therein; a motor rotatably mounted within said cavity, said motor having a shaft extending out of one end of said housing adapted to rotatably drive a tool; means for pneumatically driving said motor with a fluid; means for sealing said motive fluid in the motor housing; means between the shaft housing end and the sealing means for receiving any leakage motive fluid that leaks beyond the sealing means; and means communicating with said leakage receiving means for creating thereat a pressure less than atmospheric to withdraw any motive fluid that leaks into said leakage receiving means whereby motive fluid is prevented from passing into the operative area of the tool.
Claim 12
Dependent Claim
41 words
The invention of claim 9 wherein said means for pneumatically driving said motor comprises: an inlet passageway extending into said housing and communicating with said motor cavity; and an exhaust passageway extending through said housing and communicating with said motor cavity.
Claim 13
Dependent Claim
71 words
The invention of claim 10 wherein said means for removing any motive fluid includes a venturi in said exhaust passageway and second cavity passageways formed in said motor housing having one end communicating with said second cavity and the other end communicating with the throat of said venturi whereby the drop in pressure at the throat of the venturi creates a vacuum in the second cavity passageway and the second cavity.
Claim 14
Dependent Claim
36 words
The invention of claim 9 further including a cooling fluid passageway to provide cooling fluid to the operative area of the tool and valve means for simultaneously controlling the flow of motive fluid and cooling fluid.
Claim 15
Dependent Claim
13 words
The invention of claim 12 wherein said valve means includes a spool valve.
Claim 16
Dependent Claim
87 words
The invention of claim 9 further including a main housing; a collet shaft rotatably mounted within said main housing, said collet shaft having a collet formed at the other extremity thereof; a collet nut adapted to be threaded into said collet; a hollow sleeve extending over said collet shaft and being fixedly connected to said main housing; at least one locking dog integrally connected to said collet shaft and a plurality of splines formed on the interior of said hollow sleeve to interconnect with said locking dog.
Claim 17
Dependent Claim
41 words
The invention of claim 14 further including a cooling fluid passageway adapted to provide cooling fluid to the operative area of the tool and valve means including a spool valve for simultaneously controlling the flow of motive fluid and cooling fluid.
Claim 18
Dependent Claim
163 words
A dental surgical drill assembly for use with a variety of drill bits comprising: a main housing; a collet shaft rotatably mounted within said main housing, said collet shaft having a collet formed at the other extremity thereof; means for driving said collet shaft in response to a motive fluid; a collet nut adapted to be threaded into said collet; a hollow sleeve extending over said collet shaft and being fixedly connected to said main housing; at least one locking dog integrally connected to said collet shaft and a plurality of splines formed on the interior of said hollow sleeve to interconnect with said locking dog, whereby the collet shaft can be locked against rotation for permitting said collet nut to be threaded into said collet; a source of cooling fluid; and a cooling fluid passageway to provide said cooling fluid to the operative area of said drill bit and valve means for simultaneously controlling the flow of motive fluid and cooling fluid.
Claim 19
Dependent Claim
163 words
A dental surgical drill assembly for use with a variety of drill bits comprising: a main housing; a collet shaft rotatably mounted within said main housing, said collet shaft having a collet formed at the other extremity thereof; means for driving said collet shaft in response to a motive fluid; a collet nut adapted to be threaded into said collet; a hollow sleeve extending over said collet shaft and being fixedly connected to said main housing; at least one locking dog integrally connected to said collet shaft and a plurality of splines formed on the interior of said hollow sleeve to interconnect with said locking dog, whereby the collet shaft can be locked against rotation for permitting said collet nut to be threaded into said collet; a source of cooling fluid; and a cooling fluid passageway to provide said cooling fluid to the operative area of said drill bit and valve means for simultaneously controlling the flow of motive fluid and cooling fluid.
Claim 20
Dependent Claim
59 words
The invention of claim 16 wherein said sleeve is axially movable between a first and second position, in said first position said locking dogs are out of engagement with said splines to enable the collet shaft to be freely rotatable, in said second position the splines are moved axially, along with said sleeve, into engagement with the locking dogs.
Claim 21
Dependent Claim
69 words
The invention of claim 9 wherein said means for receiving any leakage motive fluid includes a second cavity in said housing, said cavity located between said means for sealing and said shaft housing end; and said means for withdrawing any leakage motive fluid that has passed beyond said means for sealing includes a passageway connected to the second cavity and extending away from said shaft end of said housing.
Claim 22
Dependent Claim
78 words
The invention of claim 9 further including a fluid passageway connected to said motor, and wherein said means for withdrawing any leakage motive fluid includes a second cavity in said housing for collecting any motive fluid that has passed beyond said means for sealing, and a venturi in said fluid passageway connected to said motor and a venturi passageway between the venturi and said second cavity whereby a pressure less than atmospheric is created in the second cavity.
Claim 23
Dependent Claim
13 words
The invention of claim 19 wherein said motor comprises a sliding vane motor.
Claim 24
Dependent Claim
14 words
The invention of claim 19 wherein said motor shaft extends through said second cavity.
Claim 25
Dependent Claim
23 words
The invention of claim 21 wherein said shaft has a shaft seal between said second cavity and the operative area of the tool.
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |