Patent US3733090A successfully refreshed from Google Patents.
US3733090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-jackknifing assembly
Assignee: Individual
•
Filing: 1971-04-09
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Granted: 1973-05-15
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Expires: 1991-04-09
Abstract
Abstract This disclosure relates to apparatus for use in combination with a towing vehicle and a towed vehicle pivotally connected in tandem thereto. Carried on the so-called fifth wheel of the towing or tractor are retractable members which may be extended into a position in which they will engage stopping blocks defined in opposite ends of arcuate paths defined on the towed vehicle or trailer.
Inventors
- 👤 A Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:17
CPC Classifications
B; B62; B62D; B62D53/00; B62D53/04; B62D53/08; B62D53/0871; B62D53/0878
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
In combination with a tractor and trailer where the trailer is partially supported on the surface of a plate-like member carried by said tractor and has a pivotal connection to the tractor intermediate the edges of said member, first and second extendable means carried by said member on opposite sides thereof and disposed outwardly of the supporting surface of said member, said extendable means arranged to be extended beyond said surface of said member, and means on the underside of said trailer spaced apart to define stopping members for each of said extendable means and be engaged thereby to limit relative turning of the trailer with respect to the tractor.
Claim 2
Dependent Claim
110 words
In combination with a tractor and trailer where the trailer is partially supported on the surface of a plate-like member carried by said tractor and has a pivotal connection to the tractor intermediate the edges of said member, first and second extendable means carried by said member on opposite sides thereof and disposed outwardly of the supporting surface of said member, said extendable means arranged to be extended beyond said surface of said member, and means on the underside of said trailer spaced apart to define stopping members for each of said extendable means and be engaged thereby to limit relative turning of the trailer with respect to the tractor.
Claim 3
Dependent Claim
21 words
The arrangement of claim 1 further including means for extending and Retracting said extendable members from positions to engage stopping members.
Claim 4
Dependent Claim
62 words
The arrangement of claim 1 wherein housing means are attached to said plate-like member on opposite sides thereof with respect to the longitudinal center of the tractor, each of said housing means carrying one of said extendable means in the form of a cylindrical plunger, and fluid operated means in each of said housing means for extending and retracting said extendable means.
Claim 5
Dependent Claim
40 words
The arrangement of claim 1 wherein said stopping members on the underside of the trailer include resilient means to control the rate of application of forces when said extendable means engages said stopping members on the underside of the trailer.
Claim 6
Dependent Claim
32 words
The arrangement of claim 4 wherein said rate controlling means comprise springs which are initially engaged by said extendable means which transmit the forces of said extendable means to said stopping members.
Claim 7
Dependent Claim
113 words
In combination with a tractor and trailer where the trailer is partially supported on the surface of a plate-like member carried by said tractor and has a pivotal connection to the tractor intermediate the edges of said member, extendable means carried by said member on opposite sides thereof and arranged to be extended beyond said surface of said member, and means on the underside of said trailer spaced apart to define stopping members for said extendable means and be engaged thereby to limit relative turning of the trailer with respect to the tractor, said stopping members being positioned on said trailer to limit the angle with said tractor to no more, than 20*.
Claim 8
Dependent Claim
113 words
In combination with a tractor and trailer where the trailer is partially supported on the surface of a plate-like member carried by said tractor and has a pivotal connection to the tractor intermediate the edges of said member, extendable means carried by said member on opposite sides thereof and arranged to be extended beyond said surface of said member, and means on the underside of said trailer spaced apart to define stopping members for said extendable means and be engaged thereby to limit relative turning of the trailer with respect to the tractor, said stopping members being positioned on said trailer to limit the angle with said tractor to no more, than 20*.
References Cited (Backward Citations)
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |