Patent US4944546A successfully refreshed from Google Patents.
US4944546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foldable truck ramp
Assignee: Individual
•
Filing: 1989-09-08
•
Granted: 1990-07-31
•
Expires: 2009-09-08
Abstract
Abstract A three-section folding ramp that can also serve as an endgate for a truck bed. The ramp has mechanically folding and unfolding legs, so that the user doesn't have to pull the legs open one by one. A special latch allows all three sections to be held together while the folded ramp is being used as an endgate. A special channel allows the folded up ramp to rest when in the open endgate position without damaging the vehicle body.
Inventors
- 👤 William K. Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:06
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/43; B60P1/435
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A folding ramp for vehicles including: a first plate having a top and bottom pivotably attached to a vehicle; a second plate having a top and bottom pivotably attached to said first plate; a third plate having a top and bottom pivotably attached to said second plate; a plurality of legs pivotably attached to and extending away from said bottom of said second plate; said legs biased by springs to extend out from said bottom of said second plate; cable means connecting each leg to one end of a pivoting means; and said one end of said pivoting means slidably engaged to said bottom of said second plate, said pivoting means having an opposite end pivotably attached to said bottom of said first plate; whereby unfolding of said first and second plates extends said legs, and folding together said first and second plates causes said legs to retract.
Claim 2
Dependent Claim
148 words
A folding ramp for vehicles including: a first plate having a top and bottom pivotably attached to a vehicle; a second plate having a top and bottom pivotably attached to said first plate; a third plate having a top and bottom pivotably attached to said second plate; a plurality of legs pivotably attached to and extending away from said bottom of said second plate; said legs biased by springs to extend out from said bottom of said second plate; cable means connecting each leg to one end of a pivoting means; and said one end of said pivoting means slidably engaged to said bottom of said second plate, said pivoting means having an opposite end pivotably attached to said bottom of said first plate; whereby unfolding of said first and second plates extends said legs, and folding together said first and second plates causes said legs to retract.
Claim 3
Dependent Claim
51 words
The folding ramp according to claim 1, wherein: said pivoting means comprises an elongated shaft; said one end of said pivoting means comprises a tubular collar pivotably attached to said elongated shaft; said collar is freely and slidably disposed around an elongated raod attached to said bottom of said second plate.
Claim 4
Dependent Claim
36 words
The folding ramp according to claim 2, further comprising: a plurality of cable guides disposed across said bottom of said second plate, said cables disposed through said cable guides from said legs to said pivoting means.
Claim 5
Dependent Claim
22 words
The folding ramp according to claim 1, including: latch means to hold said first, second and third plates in a folded position.
Claim 6
Dependent Claim
76 words
The folding ramp according to claim 4, wherein said latch means includes: first and second hollow tubular guides disposed parallel on adjacent edges of said first and third plates when said ramp is folded; generally U-shaped bolt member having opposite ends disposable into said tubular guides; and spring means to bias said U-shaped bolt member into said first and second tubular guides, said spring means being compressible to remove said U-shaped member from said tubular guides.
Claim 7
Dependent Claim
47 words
The folding ramp according to claim 1, including: an elongated channel disposed beneath the point at which said first plate is pivotably attached to said vehicle, said channel comprising two elongated flanges disposed normal to each other and attached to each other along a common elongated edge.
Claim 8
Dependent Claim
44 words
The folding ramp according to claim 1, including: one or more continuous flanges disposed on and noramal to said bottoms of said plates, said flanges on said respective plates abut when said folding ramp is extended thus limiting the extension of said folding ramp.
References Cited (Backward Citations)
DE307313C
Cited
US963918A
Cited
US2611466A
Cited
US2776063A
Cited
US3642156A
Cited
US3976209A
Cited
US4034716A
Cited
US4068770A
Cited
US4088235A
Cited
US4878800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |