US3774941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trailer anti-jackknife device
Assignee: Individual
•
Filing: 1972-02-14
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Granted: 1973-11-27
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Expires: 1992-02-14
Abstract
Abstract An anti-jackknife device for a tractor semi-trailer combination is disclosed herein. The tractor has a conventional fifth wheel mounted at the rearward end thereof and the trailer has a kingpin extending downwardly from the lower forward end thereof for detachable connection with the fifth wheel. A plurality of disc brake assemblies are secured to the underside of the fifth wheel and rotatably support a brake disc therein. A hub means is secured to the brake disc and has a pair of opposing locking arms pivotally secured thereto which are movable into locking engagement with recesses in the underside of the trailer. A pneumatic cylinder means is connected to the locking arms for moving the arms between locked and unlocked positions with respect to the trailer. The disc brake assemblies are operatively connected to the tractor brake system so that actuation of the tractor brakes causes the disc brake assemblies to frictionally engage the brake disc to prevent rotation of the same with respect to the fifth wheel which prevents further angular displacement of the trailer with respect to the tractor. An airhydraulic booster system is operatively connected to the disc brake assemblies to provide the necessary pressure thereto.
Inventors
- 👤 H Durr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:46
CPC Classifications
B; B62; B62D; B62D53/00; B62D53/04; B62D53/08; B62D53/0871; B62D53/0878
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
283 words
In combination, a truck having a fifth wheel means thereon, a trailer having a kingpin extending downwardly adjacent its forward end detachable connection to said fifth wheel means so that said truck can pull said trailer, said fifth wheel means having top and bottom portions, said top portion positioned closely adjacent the forward bottom area of said trailer, a plurality of disc brake assemblies secured to said fifth wheel means adjacent said bottom portion, a brake disc mounted in each of said disc brake assemblies and being supported thereby, said brake disc normally being freely rotatable with respect to said disc brake assemblies, a locking assembly rigidly secured to said brake disc, said locking assembly comprising an arm means movable between locked and unlocked positions, said arm means, when in its locked position, causing the brake disc to rotate with respect to said disc brake assemblies upon angular movement of said truck with respect to said trailer if said disc brake assemblies are not actuated, said arm means, when in its locked position, substantially preventing angular displacement of said trailer with respect to said truck when said disc brake assemblies are actuated, the actuation of said disc brake assemblies causing said disc brake assemblies to frictionally engage said brake disc to prevent rotation of said brake disc with respect to said disc brake assemblies and said fifth wheel, said locking assembly comprising a hub means centrally secured to said brake disc, said arm means comprising first and second spaced apart locking arms pivotally connected to said hub means about horizontal axes, and a power cylinder means operatively connected to said locking arms for moving said locking arms into locking engagement with said trailer.
Claim 2
Dependent Claim
283 words
In combination, a truck having a fifth wheel means thereon, a trailer having a kingpin extending downwardly adjacent its forward end detachable connection to said fifth wheel means so that said truck can pull said trailer, said fifth wheel means having top and bottom portions, said top portion positioned closely adjacent the forward bottom area of said trailer, a plurality of disc brake assemblies secured to said fifth wheel means adjacent said bottom portion, a brake disc mounted in each of said disc brake assemblies and being supported thereby, said brake disc normally being freely rotatable with respect to said disc brake assemblies, a locking assembly rigidly secured to said brake disc, said locking assembly comprising an arm means movable between locked and unlocked positions, said arm means, when in its locked position, causing the brake disc to rotate with respect to said disc brake assemblies upon angular movement of said truck with respect to said trailer if said disc brake assemblies are not actuated, said arm means, when in its locked position, substantially preventing angular displacement of said trailer with respect to said truck when said disc brake assemblies are actuated, the actuation of said disc brake assemblies causing said disc brake assemblies to frictionally engage said brake disc to prevent rotation of said brake disc with respect to said disc brake assemblies and said fifth wheel, said locking assembly comprising a hub means centrally secured to said brake disc, said arm means comprising first and second spaced apart locking arms pivotally connected to said hub means about horizontal axes, and a power cylinder means operatively connected to said locking arms for moving said locking arms into locking engagement with said trailer.
Claim 3
Dependent Claim
51 words
The combination of claim 1 wherein each of said locking arms have inner end portions which are positioned below said fifth wheel which extend outwardly from said hub means, each of said locking arms having outer end portions which extend upwardly from said inner end portions outwardly of said fifth wheel.
Claim 4
Dependent Claim
73 words
The combination of claim 1 wherein said truck has an air brake system, said disc brakes being hydraulically operated and being connected to a pressure booster assembly, said air brake system being connected to said pressure booster assembly to supply air under pressure thereto when the truck brakes are actuated, said pressure booster unit being adapted to respond to the air pressure supplied thereto and to actuate said hydraulically operated disc brake assemblies.
Claim 5
Dependent Claim
31 words
The combination of claim 1 wherein said trailer has a wear plate secured to its lower forward end, said wear plate having a recess formed therein for receiving saiD arm means.
Claim 6
Dependent Claim
137 words
In combination, a truck having a fifth wheel means thereon, a trailer having a kingpin extending downwardly adjacent its forward end for detachable connection to said fifth wheel means so that said truck can pull said trailer, said fifth wheel means having top and bottom portions, said top portion positioned closely adjacent the forward bottom area of said trailer, a locking arm means operatively rotatably mounted on said fifth wheel means, said locking arm means being pivotally movable from locked to unlocked positions, a brake means operatively interconnecting said fifth wheel means and said locking arm means for selectively preventing the rotation of said locking arm means with respect to said fifth wheel when said brake means is activated, said locking arm means engaging said trailer to prevent jackknifing from occurring when said brake means is activated.
Claim 7
Dependent Claim
137 words
In combination, a truck having a fifth wheel means thereon, a trailer having a kingpin extending downwardly adjacent its forward end for detachable connection to said fifth wheel means so that said truck can pull said trailer, said fifth wheel means having top and bottom portions, said top portion positioned closely adjacent the forward bottom area of said trailer, a locking arm means operatively rotatably mounted on said fifth wheel means, said locking arm means being pivotally movable from locked to unlocked positions, a brake means operatively interconnecting said fifth wheel means and said locking arm means for selectively preventing the rotation of said locking arm means with respect to said fifth wheel when said brake means is activated, said locking arm means engaging said trailer to prevent jackknifing from occurring when said brake means is activated.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |