Portable ramp for motor vehicles
A portable ramp for motor vehicles molded from co-polymer where the ramp has a longitudinal spine extending through a grid, has a sloped portion and a horizontal upper portion to support a wheel of a vehicle. The wheel is in direct contact with the grid and the grid is open from top to bottom between the spine and the side walls. The spine has an arc-shaped cross-section.
1. A portable ramp for use on a supporting surface for raising part of a wheeled motor vehicle above said surface, said ramp comprising a sloped portion and an upper portion, said ramp having a top, a bottom, two sides, a first end and a second end, there being two ends, said first end being located at a lower end of said sloped portion, said ramp having a spine extending longitudinally therein between said ends, said spine having an arc-shaped cross-section that is open toward said bottom, with a grid extending upward and downward from said spine between said side walls, said ramp being sized and shaped to enable one wheel of said vehicle to travel in contact with said grid from said first end up said sloped portion to said upper portion and vice-versa.
2. A ramp as claimed in claim 1 wherein said spine converges toward said first end.
3. A ramp as claimed in claim 2 wherein said spine is narrower than said ramp.
4. A ramp as claimed in claim 3 wherein said grid extends outward beyond said spine to said side walls.
5. A ramp as claimed in claim 1 wherein said grid is rectangular.
6. A ramp as claimed in claim 1 wherein said grid has a shape selected from the group of rectangular, square oval, elliptical, circular, diagonal and diamond.
7. A ramp as claimed in claim 1 wherein said spine has a parabolic cross-section.
8. A ramp as claimed in claim 7 wherein said spine has two lower edges.
9. A ramp as claimed in claim 8 wherein said lower edges extend to said bottom.
10. A ramp as claimed in claim 1 wherein a cross-section of said spine diverges to said lower edges.
11. A ramp as claimed in claim 1 wherein said spine commences near said first end and extends to an imaginary vertical plain near said second end.
12. A ramp as claimed in claim 1 wherein said spine extends between said ends.
13. A ramp as claimed in claim 11 wherein said spine diverges laterally from a said first end to a point in said sloped portion near said upper portion, said spine having a constant width from said point to said end of said spine in said second portion.
14. A ramp as claimed in claim 1 wherein said spine has an upper surface along an imaginary longitudinal centreline located slightly beneath the top of said grid.
15. A ramp as claimed in claim 1 wherein said spine is symmetrical about a longitudinal centreline of said ramp.
16. A ramp as claimed in claim 1 wherein said ramp is symmetrical about a longitudinal centreline of said ramp.
17. A ramp as claimed in claim 1 wherein said grid is substantially vertical and extends to said bottom.
18. A ramp as claimed in claim 1 wherein said grid is open from top to bottom between said spine and said side walls.
19. A ramp as claimed in claim 14 where a distance from said upper surface of said spine beneath said top of said grid is substantially constant throughout a length of said spine.
20. A ramp as claimed in claim 1 wherein said ramp is constructed in one piece.
21. A ramp as claimed in claim 1 wherein said grid has a longitudinal rib down said centreline, said longitudinal rib being the only longitudinal rib located between said sides that is not part of said spine.
22. A ramp as claimed in claim 4 wherein said grid extending upward from said spine has a different size from said grid extending beneath said spine.
23. A ramp as claimed in claim 1 wherein said ramp has a friction surface near said first end in contact with said supporting surface.
24. A ramp as claimed in claim 1 wherein said ramp does not have a continuous supporting surface extending between said sides from said first end to said second end.
25. A portable ramp for use on a supporting surface for raising part of a wheeled motor vehicle above said surface, said ramp comprising a sloped portion and an upper portion, said ramp having a top, a bottom, two sides, and two ends, being a lower end and an upper end, with a grid being oriented substantially vertically between said sides and between said ends and a longitudinal spine being imbedded in said grid, said spine having an arc-shaped cross-section that is open towards said bottom, said ramp being sized and shaped to enable one wheel of said vehicle to travel in contact with said grid from said lower to said upper end.