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US4015236A Expired / Lapsed US ⏱️ 0.0 years remaining

Device for controlling safety seat belts

Assignee: Renault SA
•
Filing: 1976-01-14
•
Granted: 1977-03-29
•
Expires: 1996-01-14
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Abstract

Abstract A device for checking and controlling the proper closing and locking of a safety belt of the seat of a vehicle, comprising a system for emitting electrical oscillations and at least one receiver, and reference electric switches for detecting the position of the belt and the presence of the occupant of the seat, and an alarm system. The emitter system comprises a low-frequency (excluding radio frequency oscillations) oscillator located on the lap portion of the belt strapping, said receiver comprising a pair of coils located the one under the upholstery of the seat back and the other under the upholstery of the seat bottom, each coil being associated with an amplifier and with a double voltage comparator receiving in each comparator a predetermined reference voltage with which the voltages of the signals representing the highest voltage limit or the lowest voltage limit, which are received on the corresponding coil, are compared, as a function of the position of the oscillator of the emitter system, a logic system of a type known per se receiving the signals from said comparators and from the reference switches for transmitting said signals to said alarm system.

Inventors

  • 👤 Jean-Claude Boudeville

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 06:29
CPC Classifications
B; B60; B60R; B60R22/00; B60R22/48; B60R21/00; B60R21/01; B60R21/015; B60R21/01512; B60R21/0153; B60R21/01534; B60R2022/4808; B60R2022/4816

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 211 words
A device for checking and controlling the proper closing and locking of a safety belt of the seat of a vehicle, which comprises an emitter system for emitting electrical oscillations and at least one receiver, position sensing switches for detecting the closure of the belt and the presence of an occupant on the seat, and an alarm system, wherein said emitter system comprises a low-frequency non-radio frequency electromagnetic oscillator, said oscillator being located on the lap portion of the belt strap, said receiver comprises two identical receiving circuits disposed in parallel, each of said two identical receiving circuits includes the series connection of a receiving coil, an amplifier and a double voltage comparator receiving in each comparator a predetermined reference voltage whereby the voltages of the signals representing the highest voltage limit or the lowest voltage limit received on the corresponding coil, are compared, as a function of the position of the oscillator in the emitter system, wherein said coils are located the one under the upholstery of the seat back and the other under the upholstery of the seat bottom respectively, a logic system connected to the outputs of said comparators and to said position sensing switches and said alarm system being connected at the output of said logic system.
Claim 2
Independent Claim 211 words
A device for checking and controlling the proper closing and locking of a safety belt of the seat of a vehicle, which comprises an emitter system for emitting electrical oscillations and at least one receiver, position sensing switches for detecting the closure of the belt and the presence of an occupant on the seat, and an alarm system, wherein said emitter system comprises a low-frequency non-radio frequency electromagnetic oscillator, said oscillator being located on the lap portion of the belt strap, said receiver comprises two identical receiving circuits disposed in parallel, each of said two identical receiving circuits includes the series connection of a receiving coil, an amplifier and a double voltage comparator receiving in each comparator a predetermined reference voltage whereby the voltages of the signals representing the highest voltage limit or the lowest voltage limit received on the corresponding coil, are compared, as a function of the position of the oscillator in the emitter system, wherein said coils are located the one under the upholstery of the seat back and the other under the upholstery of the seat bottom respectively, a logic system connected to the outputs of said comparators and to said position sensing switches and said alarm system being connected at the output of said logic system.
Claim 3
Dependent Claim 19 words
Device according to claim 1, wherein each coil of the receiver system consists of a flexible printed circuit plate.
Claim 4
Dependent Claim 12 words
Device according to claim 1, wherein said coils are heating the seat.
Claim 5
Dependent Claim 18 words
Device according to claim 1, further comprising an associated cyclic control means for scanning a plurality of seats.

References Cited (Backward Citations)

GB1281791A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-03-28 1980-09-27 1981-03-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-03-28 1984-09-27 1985-03-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-03-28 1988-09-27 1989-03-29 $7700.00 Window Closed / Lapsed

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