Patent US3904884A successfully refreshed from Google Patents.
US3904884A
Expired / Lapsed
US
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Seat belt operation detector
Assignee: Mitsubishi Electric Corp
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Filing: 1973-10-29
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Granted: 1975-09-09
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Expires: 1993-10-29
Abstract
Abstract A seat belt operation detector includes a first detector means for actuating at the time of sitting on a seat and a second detector means for actuating at the time of connecting of a seat belt. A flip-flop circuit is charged by the first detector means and the output of the flip-flop circuit in decided in accordance with the condition of the first and second detector means. A process circuit is provided and generates a logical output in accordance with the output of the flip-flop circuit and the second detector.
Inventors
- 👤 Kousaku Uota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:32
CPC Classifications
B; B60; B60R; B60R22/00; B60R22/48; B60R2022/4808; B60R2022/4816; B60R2022/4858; B60R2022/4883; B60R2022/4891
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
A vehicle seat belt operation detector comprising: a normally open seating detection switch which closes upon seat occupancy, a normally open seat belt utilization switch which closes upon seat belt utilization, a starter switch which when in a first position permits the vehicle to be started and which when in a second position prevents the vehicle from being started, a processing circuit for causing the starter switch to be in its first position when the seat belt utilization switch is closed while the seating detection switch is in its closed position and for causing the starter switch to be in its second position if the seat belt utilization switch is closed prior to the closing of the seating detection switch, means connecting the seating detection switch to a power source, means connecting the seat belt utilization switch to the power source through the seating detection switch, means connecting the processing circuit to the power source through the seating detection switch whereby the power source is not drained when the seating detection switch is in its normally open position and whereby the vehicle cannot be started unless the seat belt utilization switch is closed while the seating detection switch is in its closed position.
Claim 2
Dependent Claim
203 words
A vehicle seat belt operation detector comprising: a normally open seating detection switch which closes upon seat occupancy, a normally open seat belt utilization switch which closes upon seat belt utilization, a starter switch which when in a first position permits the vehicle to be started and which when in a second position prevents the vehicle from being started, a processing circuit for causing the starter switch to be in its first position when the seat belt utilization switch is closed while the seating detection switch is in its closed position and for causing the starter switch to be in its second position if the seat belt utilization switch is closed prior to the closing of the seating detection switch, means connecting the seating detection switch to a power source, means connecting the seat belt utilization switch to the power source through the seating detection switch, means connecting the processing circuit to the power source through the seating detection switch whereby the power source is not drained when the seating detection switch is in its normally open position and whereby the vehicle cannot be started unless the seat belt utilization switch is closed while the seating detection switch is in its closed position.
Claim 3
Dependent Claim
73 words
A vehicle seat belt operation detector in accordance with claim 1 wherein the process circuit comprises a flip-flop circuit having two inputs and an output, the first input being connected to the power source through an RC circuit and through the seating detection switch, the second input being connected to the power source through the seating detection switch and the seat belt utilization switch, and the output being connected to the starter switch.
Claim 4
Dependent Claim
32 words
A vehicle seat belt operation detector in accordance with claim 2 wherein the processing circuit further comprises a NAND gate connected between the output of the flip-flop circuit and the starter switch.
Claim 5
Dependent Claim
43 words
A vehicle seat belt operation detector in accordance with claim 3 wherein a NOT gate is connected between the seat belt utilization switch and the input of a NAND gate whose output is connected to the input of the first mentioned NAND gate.
Claim 6
Dependent Claim
46 words
A vehicle seat belt operation detector in accordance with claim 1 wherein the starter switch comprises a transistor which conducts when a signal is applied to its base causing a relay to be energized which prevents the application of an electrical signal to the vehicle starter.
References Cited (Backward Citations)
US3740711A
Cited
US3742448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |