Vehicle wheelchair ramp

A vehicle wheelchair ramp for loading and unloading an occupant confined to a wheelchair. The ramp is hingably mounted on the floor of the vehicle and unfolds outwardly from the vehicle for contacting the ground surface, curb, or the like. The ramp includes built-in steps with U-shaped guide channels positioned adjacent both sides of the steps for guiding the wheelchair as a wheelchair attendant uses the steps for loading and unloading the occupant in the wheelchair.

BACKGROUND OF THE INVENTION 
This invention relates generally to ramps and more particularly but not by 
way of limitation to a foldable ramp mounted in a vehicle. 
Heretofore there have been various types of ramps and loading platforms 
used for servicing airplanes, vehicles, or the like. These ramps and 
platforms are mounted on the ground surface and position adjacent the 
airplane or vehicle. In some instances the ramps or platforms ar unfolded 
from the airplane or vehicle. 
None of the prior art ramps or platforms are similar to the subject 
invention nor do they provide the advantages of the subject ramp for use 
in transporting the handicapped confined to a wheelchair. 
SUMMARY OF THE INVENTION 
The subject invention is made of a light weight metal such as aluminum, yet 
is strong enough to hold the heaviest wheelchair with a confined occupant 
and a wheelchair attendant. 
The ramp includes U-shaped channels for guiding the wheels of the 
wheelchair therein to prevent the wheels from skidding off the ramp. 
The ramp provides built-in, non-slip, pierced aluminum steps to aid the 
wheelchair attendant while loading and unloading the occupant in the 
wheelchair. 
When the ramp is unfolded from the vehicle because of its hinged 
construction the angle of incline of the ramp can be adjusted so that the 
ramp can be placed on the ground surface, curb, or any other raised 
surface. 
The ramp is completely retractable into the vehicle. When the ramp is 
retracted, it is folded into a vertical position in the vehicle taking up 
a minimum of floor space area. 
The ramp is spring biased to aid the wheelchair attendant in folding the 
ramp into the retracted position in the vehicle. 
The invention includes safety features such as a hinge latch to prevent the 
ramp from unfolding when the vehicle's door is open. Also a ramp latch is 
included for securing a first and second ramp member together when the 
ramp members are folded in the retracted position in the vehicle. 
The vehicle wheelchair ramp includes a first ramp member having a first end 
portion and second end portion. The first end portion of the first ramp 
member is hingeably mounted to the floor of the vehicle. A second ramp 
member having a first end portion and a second end portion is hingeably 
mounted to the second end portion of the first ramp member. The first and 
second ramp members include U-shaped guide channels positioned along their 
lengths for guiding the wheels of the wheelchair. Positioned between the 
guide channels are built-in steps having a series of apertures pierced 
therein for providing a non-slip surface on the steps.

DETAILED DESCRIPTION OF THE DRAWINGS 
In FIG. 1 the ramp is designated by general reference numeral 10. The ramp 
10 includes a first ramp member 12 and a second ramp member 14. The first 
ramp member 12 includes a first end portion 16 and a second end portion 
18. The second ramp member 14 includes a first end portion 20 and a second 
end portion 22. The first end portion 16 of the first ramp member 12 is 
attached to a ramp base 24 by a hinge 26 shown in FIG. 2. The second end 
portion 18 of the first ramp member 12 is attached to the first end 
portion 20 of the second ramp member 14 by a hinge 27. 
In this view the ramp 10 is shown in a retracted position inside a vehicle 
28 with the first ramp member 12 and second ramp member 14 folded in a 
vertical position and disposed adjacent and parallel to each other. The 
ramp base 24 is mounted on a floor 29 of the vehicle 28. 
The ramp 10 is shown in dotted lines in a semi-unfolded position as the 
first and second ramp members 12 and 14 are pulled outwardly and 
downwardly from the vehicle 28. The ramp 10 is also shown in dotted lines 
in a completely unfolded position wherein the second end portion 22 of the 
second ramp member 14 is now bearing on a ground surface 30. 
When it is desired to retract the ramp 10 the first and second ramp members 
12 and 14 are folded upwardly and inwardly toward the vehicle 28. The 
retraction of the ramp 10 into the vehicle 28 is aided by coil springs 32 
mounted on the ramp base 24 and attached to pivot arms 34. The pivot arms 
34 are positioned on opposite sides of the first end portion 16 of the 
first ramp member 12 and slidably attached thereto. Through the use of the 
coil torsion springs 32, the ramp 10 is biased toward the retracted 
position inside the vehicle 28 thereby aiding the wheelchair attendant in 
folding the ramp members 12 and 14 into the vehicle 28. 
A portion of built-in steps 36 are shown in FIG. 1. The built-in steps 36 
are disposed along the length of the first and second ramp members 12 and 
14. The steps 36 are used by the wheelchair attendant in climbing up or 
down the ramp 10 while loading or unloading the occupant in the 
wheelchair. It should be noted that the steps 36 are positioned on the 
first and second ramp members 12 and 14 so that when the second ramp 
member 14 is folded into the first ramp member 12 and the ramp 10 is 
retracted into the vehicle 28, the lower portion of the steps 36 in the 
first ramp member 12 mate with the upper portion of the steps 36 in the 
second ramp member 14 thereby allowing the ramp members 12 and 14 to be 
disposed adjacent and parallel to each other inside the vehicle 28. 
Also shown in FIG. 1 are ramp handles 38 which are disposed on opposite 
sides of the second ramp member 14. The second ramp member 14 is held in 
place inside the vehicle 28 and adjacent the first ramp member 12 by ramp 
latches 40 which are slidably attached to the first ramp member 12 and 
engage the handles 38 when the ramp 10 is in its retracted position in the 
vehicle 28. Also the ramp 10 is prevented from swinging outward on hinge 
26 when the vehicle door is opened by hinge latches 42 which releasably 
engage latch pins 44. The latch pins 44 are mounted on the sides of the 
first end portion 16 of the first ramp member 14. The ramp latches 40 and 
the hinge latches 42 will be discussed in greater detail under the 
discussion of FIG. 4 and FIG. 5. 
In FIG. 2 a front view of the ramp 10 can be seen folded into a retracted 
position inside a door 46 of the vehicle 28. In this view the second ramp 
member 14 which is substantially identical to the first ramp member 12 is 
shown with U-shaped channels 48 positioned along the length of the second 
ramp member 14 and disposed on each side of the ramp member 14. The 
U-shaped channels 48 are substantially wide enough for receiving the 
wheels of wheelchairs having various widths and providing a guide for the 
wheels as the wheelchair is loaded and unloaded on the ramp 10. Also the 
U-shaped channels 48 prevent the wheels from slipping off the sides of the 
first and second ramp members 12 and 14. 
Disposed between the U-shaped channels 48 are the steps 36. A horizontal 
portion 50 of the steps 36, the portion 50 being horizontal when the ramp 
10 is unfolded and ready for use, includes a series of equally spaced 
apertures 52 which are pierced through the metal surface upwardly 
providing a non-slip surface to aid the wheelchair attendant in climbing 
the steps 36. The ramp 10 while it can be made of various types of 
materials or metals, is preferably made of aluminum to provide the ramp 10 
with a lightweight but rugged structure. 
In operation the vehicle 28 is stopped and the door 46 is opened exposing 
the ramp 10 disposed in a retracted vertical position inside the vehicle 
28. The wheelchair attendant releases the ramp latches 40 from the handles 
38 thereby allowing the second ramp member 14 to be unfolded from the 
first ramp member 12. After the ramp latches 40 are released, the hinge 
latches 42 which are attached to the first ramp member 12 are then 
released. At this point the ramp 10 is ready to be unfolded from the 
vehicle 28. By grasping the handles 38 the first ramp member 12 and second 
ramp member 14 are unfolded as shown in FIG. 1 until the second end 
portion 22 of the second ramp member 14 contacts the ground surface. 
Because of the ramp 10 being attached to the ramp base 24 by hinge 26, the 
angle of incline of the ramp can be easily adjusted so that the second end 
portion 22 of the second ramp member 14 can also be placed on a curb or 
any other surface above the ground. When the ramp 10 is completely 
unfolded as shown in FIG. 3 the occupant in the wheelchair is ready to be 
unloaded or loaded into the vehicle. For example assume the wheelchair 
occupant is ready for being loaded into the vehicle 28. The wheelchair 
attendant guides the wheelchair up to the second end portion 22 of the 
second ramp member 14. Through the use of the U-shaped channels 48 
positioned on both sides of the first and second ramp members 12 and 14, 
the wheels of the wheelchair are guided up the ramp and into the vehicle 
28. As the wheelchair attendant guides the occupant in the wheelchair up 
the ramp 10 and into the vehicle 28, the attendant uses the steps 36 to 
climb the ramp 10. 
When the wheelchair attendant has safely secured the wheelchair occupant in 
the vehicle 28, the attendant walks down the ramp steps 36 and folds the 
first and second ramp members 12 and 14 upwardly and inwardly into the 
door 46 of the vehicle 28. As the ramp 10 is folded into the retracted 
position in the vehicle 28, the attendant is aided by the coil springs 32 
mounted to the ramp base 24 and attached to the first ramp member 16 which 
is biased toward the retracted position in the vehicle 28. When the first 
and second ramp members 12 and 14 are folded vertically in the vehicle 28 
the ramp latches 40 are attached to the handles 38 and the hinge latches 
42 are attached to the latch pins 44 thereby securing the ramp 10 inside 
the vehicle 28. 
In FIG. 4 a sectional side view of the ramp 10 is seen in its retracted 
position and illustrating in greater detail the hinge latch 42 and the 
ramp latch 40. Also seen in this view in detail is the coil spring 32 
attached to the ramp base 24 and the pivot arm 34. The pivot arm 34 is 
slidably attached to a pivot pin 56 which is mounted to the sides of the 
first end portion 16 of the first ramp member 12. 
In this view the ramp latch 40 which is slidably attached to the sides of 
the first end portion 16 of the first ramp member 12 is shown including a 
U-shaped end portion 58 which slidably engages a portion of the handle 38. 
In this view the U-shaped end portion 58 is seen engaging the handle 38. 
By sliding the latch 40 downwardly the handle 38 is released thereby 
disengaging the second ramp member 14 from the first ramp member 12. 
The hinge latch 42 is shown biased upwardly in a clockwise direction by a 
spring 60. The hinge latch 42 is seen having a U-shaped portion 62 
engaging the latch pin 44, thereby securing the first ramp member 12 to 
the ramp base 24 and preventing the ramp 10 from being unfolded from the 
vehicle 28. By moving the hinge latch 42 downwardly the U-shaped portion 
62 is disengaged from the latch pin 44. The ramp 10 can now be moved 
outwardly and downwardly on the hinge 26. 
In FIG. 5 a sectional side view of the ramp base 24 and the first end 
portion 16 of the first ramp member 12 is shown with the first ramp member 
12 in an unfolded position. In this view the hinge latch 42 has been 
released from the latch pin 44 and the ramp latch 40 has been released 
from the handle 38 and the first and second ramp members 12 and 14 have 
moved outwardly and downwardly from the vehicle 28. The pivot arm 34 which 
is attached to the coil spring 32 and the pivot pin 56 has rotated in a 
counterclockwise direction thereby compressing the coil spring 32. When 
the ramp 10 is ready to be folded and retracted into the vehicle 28 the 
coil spring 32 will bias the pivot arm 34 upwardly in a clockwise 
direction thereby aiding the wheelchair attendant in folding the first and 
second ramp members 12 and 14 into the vehicle 28. 
Changes may be made in the construction and arrangement of the parts or 
elements of the embodiment as disclosed herein without departing from the 
spirit or scope of the invention as defined in the following claims.