Patent US3645479A successfully refreshed from Google Patents.
US3645479A
Expired / Lapsed
US
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Aircraft tire explosion prevention system
Assignee: Boeing Co
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Filing: 1970-03-16
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Granted: 1972-02-29
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Expires: 1990-03-16
Abstract
Abstract The rotation of each aircraft tire is monitored and compared and when a discrepancy in these rotations shows an off-synchronized tire rotation, a warning device is activated. In addition, a temperature-sensing valve on each aircraft tire will release the air pressure in the tire and activate the warning device when a predetermined temperature level is sensed and thereafter stop the air release when a predetermined lower air pressure is reached.
Inventors
- 👤 Vaclav Kostroun
- 👤 Henry H W Quenzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:36
CPC Classifications
B; B64; B64C; B64C25/00; B64C25/32; B64C25/34; B64C25/36; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
210 words
An aircraft tire explosion prevention system comprising: a. a tachometer mounted at each aircraft wheel for sensing rotation speed, b. a tire rotation indicating device electrically connected to said tachometers for indicating rotation speed value for each tire simultaneously, c. an electronic bridge circuit incorporated in said indicating device for sensing an eventual substantially slower rotation as a differential signal, d. a temperature and pressure sensing valve for each aircraft tire having a valve housing, a piston, a locking member material for securing said piston in said valve housing so that said valve is closed, said locking member material having a calculated temperature level rigidity losing quality so that said valve becomes opened when said calculated temperature destructs said locking member material and, a spring connected to said piston, biased at a predetermined force for closing said valve, e. an ultrasonic whistle for producing a supersonic frequency signal mounted on said valve for activation upon opening of said valve by air release, f. an ultrasonic frequency microphone installed adjacent said ultrasonic whistle for receiving said supersonic signal, and g. a warning indicator device electrically connected to said microphone and to said bridge circuit for activation of said warning indicator by said differential signal and by said ultrasonic frequency signal respectively.
Claim 2
Dependent Claim
210 words
An aircraft tire explosion prevention system comprising: a. a tachometer mounted at each aircraft wheel for sensing rotation speed, b. a tire rotation indicating device electrically connected to said tachometers for indicating rotation speed value for each tire simultaneously, c. an electronic bridge circuit incorporated in said indicating device for sensing an eventual substantially slower rotation as a differential signal, d. a temperature and pressure sensing valve for each aircraft tire having a valve housing, a piston, a locking member material for securing said piston in said valve housing so that said valve is closed, said locking member material having a calculated temperature level rigidity losing quality so that said valve becomes opened when said calculated temperature destructs said locking member material and, a spring connected to said piston, biased at a predetermined force for closing said valve, e. an ultrasonic whistle for producing a supersonic frequency signal mounted on said valve for activation upon opening of said valve by air release, f. an ultrasonic frequency microphone installed adjacent said ultrasonic whistle for receiving said supersonic signal, and g. a warning indicator device electrically connected to said microphone and to said bridge circuit for activation of said warning indicator by said differential signal and by said ultrasonic frequency signal respectively.
Claim 3
Dependent Claim
27 words
A tire explosion preventing system for aircraft as claimed in claim 1 wherein said locking member material for closing said valve is made from a eutectic alloy.
Claim 4
Dependent Claim
162 words
A tire explosion prewarning and preventing system for a multiple wheel vehicle comprising: wheel rotation sensing means at each wheel for producing an electrical signal proportional to the rotation speed of each wheel; a monItor for receiving and comparing each of said signals to detect whether one of said signals displays a a substantial deviation from the others and for producing a differential signal indicating that the rotation speed of one of said wheels is deviating substantially from that of the others; valve means for releasing air from each of said tires at a predetermined tire temperature, and for stopping the release of air at a predetermined air pressure level; air release sensing means mounted on said valve means comprising means for producing an air release signal upon release of air pressure; warning signal means responsive to either of said differential signal or said air release signal to generate a signal warning the operator of the vehicle of an abnormal tire condition.
Claim 5
Dependent Claim
162 words
A tire explosion prewarning and preventing system for a multiple wheel vehicle comprising: wheel rotation sensing means at each wheel for producing an electrical signal proportional to the rotation speed of each wheel; a monItor for receiving and comparing each of said signals to detect whether one of said signals displays a a substantial deviation from the others and for producing a differential signal indicating that the rotation speed of one of said wheels is deviating substantially from that of the others; valve means for releasing air from each of said tires at a predetermined tire temperature, and for stopping the release of air at a predetermined air pressure level; air release sensing means mounted on said valve means comprising means for producing an air release signal upon release of air pressure; warning signal means responsive to either of said differential signal or said air release signal to generate a signal warning the operator of the vehicle of an abnormal tire condition.
Claim 6
Dependent Claim
30 words
The system of claim 3 wherein said air release sensing means comprises an ultrasonic whistle having an operating frequency of between 22,000 and 26,000 c.p.s. and a specially tuned microphone.
Claim 7
Dependent Claim
37 words
The system of claim 3 including a turn indicator instrument and a discriminator means operably connected to said monitor for preventing actuation of said warning signal means by said differential signal when said vehicle is being turned.
Claim 8
Dependent Claim
51 words
The system of claim 5 wherein said vehicle is an aircraft equipped with multiple wheel landing gear struts and said discriminator means further includes a squatting switch means located on each strut for preventing actuation of said warning signal means when said landing gear is in an extended position after takeoff.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |