US3695381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door-locking system for vehicles
Assignee: Denso Corp
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Filing: 1971-06-16
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Granted: 1972-10-03
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Expires: 1991-06-16
Abstract
Abstract A system for locking vehicle doors in which energization of a locking cross valve and an unlocking cross valve is extended for a predetermined period of time by utilizing the charging and discharging of a capacitor even after a manual switch is opened, so that the cross valves continue to be energized for a longer period than the time by which the energization of the cross valves and servo systems may be delayed, thereby locking or unlocking the doors in a running vehicle without fail.
Inventors
- 👤 Masashi Okada
- 👤 Ichita Sogabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:25
CPC Classifications
E; E05; E05B; E05B77/00; E05B77/54; Y; Y10; Y10T; Y10T70/00; Y10T70/60; Y10T70/625; Y10T70/65
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
220 words
A door-locking system for vehicles comprising vehicle speed detector means for generating a digital signal proportional to the vehicle speed; D-A converter means for converting said digital signal into an analog signal; amplifier means including a Schmitt circuit whose operating state is reversed when the voltage across the terminals of an integrating capacitor in said D-A converter means reaches a predetermined leVel; a first relay which energizes a locking electromagnetic means on receipt of a signal generated by the reversal of the operating state of the Schmitt circuit in the amplifier means; switching means which is manually switched between locking and unlocking sides and, when closed onto the locking side, forms a circuit for charging the integrating capacitor in the D-A converter means; a second relay which includes a relay coil and a capacitor in parallel therewith and energizes the unlocking electromagnetic means on energization of said relay coil when said switching means is closed onto the unlocking side; a locking servo system which is driven to lock the doors when the locking electromagnetic means is energized and which includes a holder means for holding the resulting locked state; and an unlocking servo system which is driven to unlock the doors when the unlocking electromagnetic means is energized and which includes a holder means for holding the resulting unlocked state.
Claim 2
Dependent Claim
220 words
A door-locking system for vehicles comprising vehicle speed detector means for generating a digital signal proportional to the vehicle speed; D-A converter means for converting said digital signal into an analog signal; amplifier means including a Schmitt circuit whose operating state is reversed when the voltage across the terminals of an integrating capacitor in said D-A converter means reaches a predetermined leVel; a first relay which energizes a locking electromagnetic means on receipt of a signal generated by the reversal of the operating state of the Schmitt circuit in the amplifier means; switching means which is manually switched between locking and unlocking sides and, when closed onto the locking side, forms a circuit for charging the integrating capacitor in the D-A converter means; a second relay which includes a relay coil and a capacitor in parallel therewith and energizes the unlocking electromagnetic means on energization of said relay coil when said switching means is closed onto the unlocking side; a locking servo system which is driven to lock the doors when the locking electromagnetic means is energized and which includes a holder means for holding the resulting locked state; and an unlocking servo system which is driven to unlock the doors when the unlocking electromagnetic means is energized and which includes a holder means for holding the resulting unlocked state.
References Cited (Backward Citations)
US3630305A
Cited
US3613820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |