US3779612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trailer brake control system
Assignee: Beka St Aubin SA
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Filing: 1971-05-17
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Granted: 1973-12-18
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Expires: 1991-05-17
Abstract
Abstract A trailer brake control system for a tractor-trailer arrangement which comprises a deceleration transmitter located at the tractor for generating electrical signals as a function of the braking or deceleration action exerted at the tractor. An electronic circuit serves to amplify the generated electrical signals. Mechanisms responsive to the amplified electrical signals serve to operate braking apparatus arranged at the trailer.
Inventors
- 👤 H Tschannen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:00
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1701; B60T8/1708; B60T8/32; B60T8/72; B60T8/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A trailer brake control system for a tractor-trailer arrangement, comprising in combination a circular pendulum deceleration transmitter means installed at the tractor and which, during braking of the tractor, controls the quantity of light received by a photoelement from a light source supplied by a constant voltage, so that at said photoelement the resistance thereof increases or decreases in proportion to the momentary deceleration of the tractor; electronic means in circuit with said deceleration transmitter for delivering as a function of the momentary resistance of said photoelement an electrical signal having an intensity which is proportional to the momentary deceleration of the tractor; transducer means which, as a function of such electrical signal, acts upon a braking unit, actuated in proportion to the intensity of such electrical signal, and wherein said braking unit incorporates a brake cylinder containing a piston, said transducer means defining an electro-pneumatic transducer means comprising an electro-dynamic transducer, means for finely mechanically coupling said electrodynamic transducer substantially reactive free with a control valve, said control valve cooperating with a reaction unit, and wherein said control valve acts through the agency of relay valve means upon said piston within said brake cylinder.
Claim 2
Dependent Claim
195 words
A trailer brake control system for a tractor-trailer arrangement, comprising in combination a circular pendulum deceleration transmitter means installed at the tractor and which, during braking of the tractor, controls the quantity of light received by a photoelement from a light source supplied by a constant voltage, so that at said photoelement the resistance thereof increases or decreases in proportion to the momentary deceleration of the tractor; electronic means in circuit with said deceleration transmitter for delivering as a function of the momentary resistance of said photoelement an electrical signal having an intensity which is proportional to the momentary deceleration of the tractor; transducer means which, as a function of such electrical signal, acts upon a braking unit, actuated in proportion to the intensity of such electrical signal, and wherein said braking unit incorporates a brake cylinder containing a piston, said transducer means defining an electro-pneumatic transducer means comprising an electro-dynamic transducer, means for finely mechanically coupling said electrodynamic transducer substantially reactive free with a control valve, said control valve cooperating with a reaction unit, and wherein said control valve acts through the agency of relay valve means upon said piston within said brake cylinder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |