US3837678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti jack knive apparatus
Assignee: Lee Raymond Organization Inc
•
Filing: 1973-05-03
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Granted: 1974-09-24
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Expires: 1993-05-03
Abstract
Abstract Anti-Jack Knife Apparatus comprising a horizontal member pivotally secured to the rear of a tractor and pivotable in the longitudinal direction in a vertical plane. The member is horseshoe shaped and has a longitudinal recess extending from one end disposed at a point intermediate the edges to the other end at an edge of the member. A vertical rod rigidly secured to the front of a trailer extends downward into the recess at the one end. The rod is rotatable in the recess. Means is provided with an element having extended and withdrawn positions. In the extended position, the element extends into the recess and locks the trailer and tractor into longitudinally aligned positions. The element in withdrawn position is withdrawn from the recess to unlock the trailer and tractor. Jack knifing cannot occur when the trailer and tractor are locked together.
Inventors
- 👤 R Cicero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:04
CPC Classifications
B; B62; B62D; B62D53/00; B62D53/04; B62D53/08; B62D53/0871; B62D53/0878
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
190 words
Anti-jack knife apparatus adapted for use with a tractor and trailer, said apparatus comprising: a horizontal member having a longitudinally extending recess terminating at one end at an edge of the member and at the other end in the member at a point intermediate the edges, said member being secured pivotally either to the rear of the tractor or the front of the trailer and being pivotal in the longitudinal direction in a vertical plane; a vertical rod having one end extending into said other end of said longitudinal recess and rotatable about its axis in the slot, the rod being secured to the one of the trailer or tractor which does not carry the member to provide a vertical articulative connection between said tractor and trailer; and means mounted on the one of the trailer or tractor which does not carry the member and having an element which in one position can be extended into the recess to lock the tractor and trailer into longitudinally aligned positions whereby jack knifing cannot occur, said element in another position being withdrawn to unlock trailer and trailer whereby jack knifing can occur.
Claim 2
Dependent Claim
190 words
Anti-jack knife apparatus adapted for use with a tractor and trailer, said apparatus comprising: a horizontal member having a longitudinally extending recess terminating at one end at an edge of the member and at the other end in the member at a point intermediate the edges, said member being secured pivotally either to the rear of the tractor or the front of the trailer and being pivotal in the longitudinal direction in a vertical plane; a vertical rod having one end extending into said other end of said longitudinal recess and rotatable about its axis in the slot, the rod being secured to the one of the trailer or tractor which does not carry the member to provide a vertical articulative connection between said tractor and trailer; and means mounted on the one of the trailer or tractor which does not carry the member and having an element which in one position can be extended into the recess to lock the tractor and trailer into longitudinally aligned positions whereby jack knifing cannot occur, said element in another position being withdrawn to unlock trailer and trailer whereby jack knifing can occur.
Claim 3
Dependent Claim
23 words
Apparatus of claim 1 wherein said means is a cylinder and the element is a piston slidable into and out of the cylinder.
Claim 4
Dependent Claim
13 words
Apparatus of claim 2 wherein said means in hydraulically operated or air operated.
Claim 5
Dependent Claim
17 words
Apparatus of claim 3 wherein said member is a fifth wheel and is secured to the trailer.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |