Patent US4784545A successfully refreshed from Google Patents.
US4784545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual load trailer
Assignee: Individual
•
Filing: 1987-04-27
•
Granted: 1988-11-15
•
Expires: 2007-04-27
Abstract
Abstract A dual load trailer having upper and lower decks pivotally attached to each other by pivot arms, which are biased by means of torsion bar assemblies to apply a downward force upon the upper deck when the upper deck is in a fully raised position, and an upward force when the upper deck is in a fully lowered position. A slideable wheel carriage assembly is provided to facilitate tongue weight adjustment and access to the doors of vehicles transported on the lower deck.
Inventors
- 👤 Dennis G. Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:50
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/06; B60P3/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
201 words
A double load highway trailer comprising: a lower perimeter frame generally defining a horizontal rectangle having one axis parallel to the line of travel of the trailer; a wheel carriage assembly slidably attached to the lower perimeter frame; axle means attached to the wheel carriage assembly; a plurality of road wheels mounted in pairs to the axle means; means for sliding the wheel carriage assembly forward and back relative to the lower perimeter frame; a plurality of pivot arms in spaced relation to each other pivotally attached to the lower perimeter frame, and each movable in a substantially vertical plane parallel to the line of travel of the trailer; an upper perimeter frame generally defining a horizontal rectangle, in spaced, parallel relationship with the lower perimeter frame and pivotally attached to the pivot arms; means for translating the upper perimeter frame as the upper side of a parallelopiped defined by the pivot arms and the lower and upper perimeter frames; means for progressively biasing the corners of said parallelopiped toward collapse thereof when the parallelopiped is fully extended and toward extension thereof when fully collapsed; a trailer tongue attached to the lower perimeter frame; hitch means attached to the trailer tongue.
Claim 2
Dependent Claim
201 words
A double load highway trailer comprising: a lower perimeter frame generally defining a horizontal rectangle having one axis parallel to the line of travel of the trailer; a wheel carriage assembly slidably attached to the lower perimeter frame; axle means attached to the wheel carriage assembly; a plurality of road wheels mounted in pairs to the axle means; means for sliding the wheel carriage assembly forward and back relative to the lower perimeter frame; a plurality of pivot arms in spaced relation to each other pivotally attached to the lower perimeter frame, and each movable in a substantially vertical plane parallel to the line of travel of the trailer; an upper perimeter frame generally defining a horizontal rectangle, in spaced, parallel relationship with the lower perimeter frame and pivotally attached to the pivot arms; means for translating the upper perimeter frame as the upper side of a parallelopiped defined by the pivot arms and the lower and upper perimeter frames; means for progressively biasing the corners of said parallelopiped toward collapse thereof when the parallelopiped is fully extended and toward extension thereof when fully collapsed; a trailer tongue attached to the lower perimeter frame; hitch means attached to the trailer tongue.
Claim 3
Dependent Claim
42 words
The trailer of claim 1 wherein said trailer further comprises: adjustable height and retractable stand means for supporting the trailer tongue; lower cargo support means attached to the lower perimeter frame; and upper cargo support means attached to the upper perimeter frame.
Claim 4
Dependent Claim
77 words
The trailer of claim 1 wherein the progressive biasing means further comprises: a torsion bar rigidly attached at one end to a cooperating pivot arm; an inner tube rigidly attached to the end of the torsion bar opposite the pivot arm and to a cooperating perimeter frame member and mounted coaxially with the torsion bar; and an outer tube mounted coaxially with the inner tube and rotatably interconnected therewith and connected to a cooperating perimeter frame member.
Claim 5
Dependent Claim
23 words
The trailer of claim 1 wherein the upper and lower cargo support means further comprise spatially adjustable, detachable, and interchangeable cargo support means.
Claim 6
Dependent Claim
33 words
The trailer of claim 1 wherein the translating means further comrpises: winch means rigidly attached to the lower perimeter frame; and a winch cable interconnecting the winch means and the upper perimeter frame.
Claim 7
Dependent Claim
18 words
The trailer of claim 1 wherein the road wheels are four in number and are mounted in tandem.
Claim 8
Dependent Claim
24 words
The trailer of claim 1 wherein an automobile may be carried on the lower cargo support means when the parallelopiped is substantially fully extended.
Claim 9
Dependent Claim
19 words
The trailer of claim 1 wherein the upper support means is specially adapted to support and launch a boat.
References Cited (Backward Citations)
US4068772A
Cited
US4221420A
Cited
US4406477A
Cited
US4469346A
Cited
US4560316A
Cited
US4589814A
Cited
US4597585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |