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Patent US3673564A successfully refreshed from Google Patents.
US3673564A
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US
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Astable switching circuit
Assignee: Robert Bosch GmbH
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Filing: 1969-10-08
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Granted: 1972-06-27
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Expires: 1989-10-08
Abstract
Abstract An astable circuit arrangement for providing periodically spaced pulses to a flashing directional light system in motor vehicles. Two transistors of identical conductivity type are intercoupled through capacitive and resistance networks so as to generate the required pulses for actuating the flashing light. The coil of a relay is also actuated by these pulses, and a single-pole, double-throw switching contact arrangement of the relay connects a resistor in parallel with the emitter-collector path of one of the transistors, which conducts when the relay coil is deenergized. In the other state of the switching contact arrangement, one terminal of the motor vehicle battery is directly applied to the flashing lamps.
Inventors
- 👤 Heinz Kammerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:56
CPC Classifications
H; H03; H03K; H03K3/00; B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/34; B60Q1/38; B60Q1/385; H03L; H03L1/00; H05; H05B; H05B39/00; H05B39/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
207 words
An astable circuit with two unstable states for emitting periodically spaced pulses comprising, in combination, two semiconductor elements with interconnecting means for influencing the state of one semi-conductor element in dependency on the state of the other semi-conductor element so that when one semi-conductor element conducts the other in non-conducting and vice versa, each semi-conductor element being alternately conducting and nonconducting periodically for generating said periodically spaced pulses; relay means connected to one of said semi-conductor elements and actuated when said one semi-conductor element conducts; switching means actuated by said relay means and having two operating states, said switching means forming a conductive path in parallel with the other one of said semi-conductor elements in one of said operating states, said relay means being unactuated during said one operating state of said switching means; load means connected to said switching means when said switching means is in the other one of said operating states; and a source of voltage connected to said switching means, said switching means connecting said load means to said source of voltage when said switching means is in the other one of said operating states, whereby said load means is connected to said source of voltage during the time intervals of said pulses.
Claim 2
Dependent Claim
207 words
An astable circuit with two unstable states for emitting periodically spaced pulses comprising, in combination, two semiconductor elements with interconnecting means for influencing the state of one semi-conductor element in dependency on the state of the other semi-conductor element so that when one semi-conductor element conducts the other in non-conducting and vice versa, each semi-conductor element being alternately conducting and nonconducting periodically for generating said periodically spaced pulses; relay means connected to one of said semi-conductor elements and actuated when said one semi-conductor element conducts; switching means actuated by said relay means and having two operating states, said switching means forming a conductive path in parallel with the other one of said semi-conductor elements in one of said operating states, said relay means being unactuated during said one operating state of said switching means; load means connected to said switching means when said switching means is in the other one of said operating states; and a source of voltage connected to said switching means, said switching means connecting said load means to said source of voltage when said switching means is in the other one of said operating states, whereby said load means is connected to said source of voltage during the time intervals of said pulses.
Claim 3
Dependent Claim
17 words
The astable circuit as defined in claim 1 wherein said two semi-conductor elements comprise pnp silicon transistors.
Claim 4
Dependent Claim
17 words
The astable circuit as defined in claim 1 wherein said two semi-conductor elements comprise pnp silicon transistors.
Claim 5
Dependent Claim
29 words
The astable circuit as defined in claim 2 including capacitor means connected in parallel with the base-emitter path of said other semi-conductor element in form of a PNP transistor.
Claim 6
Dependent Claim
28 words
The astable circuit as defined in claim 1 including resistor means connected in series with said switching means when said switching means is in said one operating state.
Claim 7
Dependent Claim
17 words
The astable circuit as defined in claim 1 wherein said semi-conductor elements comprise transistors of identical type.
Claim 8
Dependent Claim
65 words
The astable circuit as defined in claim 1, said switching means comprising a movable contact switchable between two fixed contacts through actuation of said relay means, said movable contact being connected to one terminal of said voltage source and one of said fixed contacts being connected to said other semi-conductor element, the other fixed contact of said switching means being connected to said load means.
Claim 9
Dependent Claim
17 words
The astable circuit as defined in claim 6 wherein said voltage source comprises a direct current source.
Claim 10
Dependent Claim
19 words
The astable circuit as defined in claim 6 wherein said load means comprises lamp means on a motor vehicle.
Claim 11
Dependent Claim
17 words
The astable circuit as defined in claim 6 wherein said voltage source comprises a motor vehicle battery.
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |