US3859629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed alarm system for an automobile
Assignee: Toshiba Corp
•
Filing: 1973-05-09
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Granted: 1975-01-07
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Expires: 1993-05-09
Abstract
Abstract A speed alarm system for an automobile comprises a speed detector connected to the output of a generator for generating an output proportional in magnitude to a travelling speed of an automobile; a speed detector for detecting the travelling speed set to a predetermined level; an alarm signal generator operative to receive an output of the speed detector to generate two alarm signals displaced in phase from each other; and a sound reproducing device for generating from two speakers alarm sounds obtained by amplifying the outputs of the alarm signal generators.
Inventors
- 👤 Kazuo Komiyama
- 👤 Takeharu Niioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:12
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103; B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/50; B60Q1/54
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
159 words
A speed alarm system mounted on an automobile with a car stereo device including an AC generator for generating an output voltage proportional in magnitude to a travelling velocity of the automobile comprising; a speed setting device coupled to the AC generator and being selectively set to a predetermined velocity; a speed limiting detector including a Schmitt circuit coupled to the speed setting device and being operated by the output thereof when the travelling velocity of the automobile reaches said predetermined velocity; an alarm signal generator coupled to the speed detector and adapted to be operated by the output of the speed detector to generate two intermittent alarm signals shifted in phase from each other; and means for coupling the alarm signal generator to a car stereo device installed in the automobile to deliver the two alarm signals respectively from the car stereo device whether or not it has been activated prior to the attainment of said predetermined velocity.
Claim 2
Dependent Claim
159 words
A speed alarm system mounted on an automobile with a car stereo device including an AC generator for generating an output voltage proportional in magnitude to a travelling velocity of the automobile comprising; a speed setting device coupled to the AC generator and being selectively set to a predetermined velocity; a speed limiting detector including a Schmitt circuit coupled to the speed setting device and being operated by the output thereof when the travelling velocity of the automobile reaches said predetermined velocity; an alarm signal generator coupled to the speed detector and adapted to be operated by the output of the speed detector to generate two intermittent alarm signals shifted in phase from each other; and means for coupling the alarm signal generator to a car stereo device installed in the automobile to deliver the two alarm signals respectively from the car stereo device whether or not it has been activated prior to the attainment of said predetermined velocity.
Claim 3
Dependent Claim
46 words
The speed alarm system according to claim 1 in which said speed detector comprises said Schmitt circuit operated when an output voltage from the speed setting device reaches a predetermined potential, and a drive circuit adapted to be operated by the action of the Schmitt circuit.
Claim 4
Dependent Claim
59 words
The speed alarm system according to claim 1 in which said coupling means includes a terminal coupling the output of the speed limiting circuit to a load circuit of the car stereo deviCe to cause it to be operated by the output of a drive circuit included in said speed detector even when a power source switch is opened.
Claim 5
Dependent Claim
89 words
The speed alarm system according to claim 1 in which said alarm signal generator comprises an astable multivibrator for alternately generating output signals from its two terminals; two modulation wave form shaping means connected respectively to the two terminals of the astable multivibrator; an alarm signal oscillator for oscillating alarm signals having a predetermined frequency; and an output circuit for modulating the outputs of the two modulation wave form shaping means with these output signals of the alarm signal generator divided into two routes and smoothing the modulated signal.
Claim 6
Dependent Claim
41 words
The speed alarm system according to claim 1 in which said speed setting device comprises a plurality of resistors having respective resistances accurately set according to respective control speeds, and a change-over switch having contacts connected respectively to the associated resistors.
Claim 7
Dependent Claim
31 words
The speed alarm system according to claim 2 in which the drive circuit is coupled through a first backward current blocking diode to the load circuit of the car stereo device.
Claim 8
Dependent Claim
63 words
The speed alarm system according to claim 6 in which said car stereo device includes a stereo tape player comprising a motor and a dual channel sound reproducing circuit having a second backward current diode connected between the motor and the sound reproducing circuit and one end of the first backward current blocking diode connected between the second diode and the reproducing circuit.
Claim 9
Dependent Claim
95 words
The speed alarm system according to claim 1 in which said car stereo device is coupled to the sound volume adjuster and includes a sound reproducing circuit having an electric power amplifier to which the output of the alarm signal generator is received, and a level setting impedance connected between the sound volume adjusting device and a junction connected to the electric power amplifier and supplied with the output of the alarm signal generator, said level setting impedance being designed to generate at all times alarm sounds at a volume increased by a predetermined level.
References Cited (Backward Citations)
US3764975A
Cited
US3771122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |