Patent US3902247A successfully refreshed from Google Patents.
US3902247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for operating dental hand pieces
Assignee: Siemens AG
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Filing: 1973-05-03
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Granted: 1975-09-02
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Expires: 1993-05-03
Abstract
Abstract A device which can be used for operating a dental hand piece with a motor drive and a dental hand piece with a pneumatic drive, such as a turbine drive, has an electric circuit and a potentiometer connected to the input of the circuit and varying the voltage at its output. An electric valve varies the flow volume of the compressed air supplied to the pneumatic drive. A switching device connects selectively the electric motor and the electric valve with the output of the circuit.
Inventors
- 👤 Otto Fleer
- 👤 Hubert Grill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:45
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/0007; A61C1/0015; A61C1/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
A device for operating a dental hand piece with a motor drive and a dental hand piece with a pneumatic drive, such as a turbine drive, said device comprising a current source, an electric circuit device connected to the current source and having an input and an output, a potentiometer connected with said input and varying the voltage at the output, an electric valve varying the flow volume of the compressed air supplied to the pneumatic drive, and switching means connected with said output and connecting selectively said electric motor and said electric valve with the output of that circuit device, wherein said electric circuit device including an operating resistance connected with said potentiometer and a transistor having a collector-emitter connection connected in parallel with said operating resistance, said potentiometer being connected in parallel to said collector-emitter connection and said motor drive and in series to said operating resistance and influencing the basic potential of said transistor.
Claim 2
Independent Claim
157 words
A device for operating a dental hand piece with a motor drive and a dental hand piece with a pneumatic drive, such as a turbine drive, said device comprising a current source, an electric circuit device connected to the current source and having an input and an output, a potentiometer connected with said input and varying the voltage at the output, an electric valve varying the flow volume of the compressed air supplied to the pneumatic drive, and switching means connected with said output and connecting selectively said electric motor and said electric valve with the output of that circuit device, wherein said electric circuit device including an operating resistance connected with said potentiometer and a transistor having a collector-emitter connection connected in parallel with said operating resistance, said potentiometer being connected in parallel to said collector-emitter connection and said motor drive and in series to said operating resistance and influencing the basic potential of said transistor.
Claim 3
Independent Claim
143 words
A device for operating a dental hand piece with a motor drive and a dental hand piece with a pneumatic drive, such as a turbine drive, said device comprising a current source, an electric circuit device connected to the current source and having an input and an output, a potentiometer connected with said input and varying the voltage at the output, an electric valve varying the flow volume of the compressed air supplied to the pneumatic drive, said valve comprising a casing having a flow passage, a valve body and a magnetic armature for moving said valve body depending upon the voltage of the outlet of the electric circuit device for varying said flow passage, and switching means connected with said output and connecting selectively said electric motor and the magnetic armature of said electric valve with the output of the circuit device.
Claim 4
Independent Claim
143 words
A device for operating a dental hand piece with a motor drive and a dental hand piece with a pneumatic drive, such as a turbine drive, said device comprising a current source, an electric circuit device connected to the current source and having an input and an output, a potentiometer connected with said input and varying the voltage at the output, an electric valve varying the flow volume of the compressed air supplied to the pneumatic drive, said valve comprising a casing having a flow passage, a valve body and a magnetic armature for moving said valve body depending upon the voltage of the outlet of the electric circuit device for varying said flow passage, and switching means connected with said output and connecting selectively said electric motor and the magnetic armature of said electric valve with the output of the circuit device.
Claim 5
Independent Claim
138 words
A device for operating a dental hand piece with a motor drive and a dental hand piece with a pneumatic drive, such as a turbine drive, said device comprising a current source, an electric circuit device connected to the current source and having an input and an output, a potentiometer connected with said input and varying the voltage at the output, an electric valve varying the flow volume of the compressed air supplied to the pneumatic drive, and switching means connected with said output and connecting selectively said electric motor and said electric valve with the output of the circuit device, wherein said electrical valve comprises a casing having a flow passage, a piston movable in said casing to adjust said passage, a stroke magnet and a magnetic armature carried by said stroke magnet and actuating said piston.
Claim 6
Independent Claim
138 words
A device for operating a dental hand piece with a motor drive and a dental hand piece with a pneumatic drive, such as a turbine drive, said device comprising a current source, an electric circuit device connected to the current source and having an input and an output, a potentiometer connected with said input and varying the voltage at the output, an electric valve varying the flow volume of the compressed air supplied to the pneumatic drive, and switching means connected with said output and connecting selectively said electric motor and said electric valve with the output of the circuit device, wherein said electrical valve comprises a casing having a flow passage, a piston movable in said casing to adjust said passage, a stroke magnet and a magnetic armature carried by said stroke magnet and actuating said piston.
Claim 7
Dependent Claim
40 words
A device in accordance with claim 3, wherein said piston is axially movable in said casing and comprises an axially extending radial recess adapted to interconnect opposite ends of said passage and varying the extent of flow in said passage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |