US3774150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor vehicle safety device
Assignee: Nissan Motor Co Ltd
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Filing: 1971-06-28
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Granted: 1973-11-20
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Expires: 1991-06-28
Abstract
Abstract An air bag type safety device having an alarm device that indicates when the weight of the air bag operating incombustible liquid substance such as ''''Freon'''' is below a predetermined value below which the air bag fails to be properly expanded so as to reliably protect the vehicle occupants from injury resulting from a collision. The device comprises two pressure-sensors, one for sensing a vapor pressure present within a container for the substance and the other for sensing the sum of the vapor pressure and a pressure corresponding to the wieght of the substance. A differential pressure detector is provided for detecting a pressure differential between the vapor pressure and the pressure sum, that is equal to the pressure corresponding to the weight of the substance. When the weight of the substance is below the predetermined value, an alarm lamp is lighted to indicate ineffectiveness of the air bag type safety device.
Inventors
- 👤 S Matsui
- 👤 Y Hayakawa
- 👤 K Hirashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:12
CPC Classifications
B; B60; B60R; B60R21/00; B60R21/02; B60R21/16; B60R21/26; B60R21/268
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
In a motor vehicle safety device useable with an inflatable bag: a container connected to an inflatable bag during usage of the safety device; a vaporizable liquid contained within said container; means for vaporizing said liquid and discharging same from said container to sufficiently inflate said bag to render the safety device operative in use when the volume of said liquid is no less than a predetermined value; sensing means for sensing the weight of said liquid which is a function of the volume of said liquid and for developing a signal whenever said weight is less than a first preselected value corresponding to said predetermined value; and indicating means responsive to said signal for indicating that said volume is less than said predetermined value thereby indicating that said safety device is inoperative.
Claim 2
Dependent Claim
133 words
In a motor vehicle safety device useable with an inflatable bag: a container connected to an inflatable bag during usage of the safety device; a vaporizable liquid contained within said container; means for vaporizing said liquid and discharging same from said container to sufficiently inflate said bag to render the safety device operative in use when the volume of said liquid is no less than a predetermined value; sensing means for sensing the weight of said liquid which is a function of the volume of said liquid and for developing a signal whenever said weight is less than a first preselected value corresponding to said predetermined value; and indicating means responsive to said signal for indicating that said volume is less than said predetermined value thereby indicating that said safety device is inoperative.
Claim 3
Dependent Claim
153 words
A motor vehicle safety device according to claim 1, wherein said sensing means comprises first and second pressure sensitive devices each developing an electrical signal proportional to the pressure applied thereto, said first device disposed above the liquid level and responsive to pressure exerted by vapor within said container and said second device disposed beneath said liquid and responsive to the combined pressure exerted by said vapor pressure and by the weight of said liquid, means responsive to the signals developed by said first and second device for developing an electrical difference signal proportional to the difference between the two signals and which is proportional to the weight of said liquid, and means receptive of said diffeRence signal for developing an output signal whenever said difference signal is less than a second preselected value proportional to said first preselected value and corresponding to the volume of said liquid being at said pretermined value.
Claim 4
Dependent Claim
100 words
A motor vehicle safety device according to claim 1, wherein said sensing means comprises means responsive to both the pressure exerted by vapor above the liquid level in said container and the combined pressure exerted by said vapor and the weight of said liquid in said container for sensing the pressure difference therebetween corresponding to the pressure exerted by the weight of the liquid and for developing an electrical signal whenever said pressure difference is less than a second preselected value proportional to said first preselected value and corresponding to the volume of said liquid being at said predetermined value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |