Wheelchair converted vehicle having independent rear suspension and method of manufacturing
View Patent ↗A wheelchair conversion vehicle and a method of manufacturing a wheelchair conversion vehicle include replacing the OEM trailing arm with a trailing arm substitute and substantially reproducing the movement of the rear wheel OEM spindle along first or second arc paths between an upper limit and a lower limit. The upper limit is a distance above the OEM ride height and the lower limit is a distance below the OEM ride height. The conversion vehicle and method of manufacturing further include installing a wheelchair access system to provide wheelchair access to the wheelchair conversion vehicle.
1. A wheelchair conversion vehicle comprising:
a vehicle body;
a vehicle sub-frame connected to the vehicle body;
an independent rear suspension including an OEM trailing arm having a first end and a second end, the OEM trailing arm being pivotally connected to the vehicle body at the first end, the independent rear suspension and the vehicle body defining an OEM ride height;
a rear wheel OEM spindle fixedly connected to the second end of the OEM trailing arm and ratably connected to the vehicle body, the rear wheel OEM spindle moving through a defined first arc path via the OEM trailing arm pivoting at the first end, the movement of the rear wheel OEM spindle being further characterized by rotation of the rear wheel OEM spindle relative to the vehicle body to define a second arc path of a point on the rear wheel OEM spindle as a center of the rear wheel OEM spindle travels along the first arc path;
wherein the improvement comprises:
a trailing arm substitute disposed in place of the OEM trailing arm, the trailing arm substitute being configured and altered, compared to the OEM trailing arm, to not protrude into a side door opening of the wheelchair conversion vehicle and to substantially reproduce the movement of the rear wheel OEM spindle along the first or second arc paths between an upper limit and a lower limit, the upper limit being a distance above the OEM ride height and the lower limit being a distance below the OEM ride height; and
a wheelchair access system configured to provide wheelchair access to the wheelchair conversion vehicle.
2. The wheelchair conversion vehicle of claim 1 , wherein
the trailing arm substitute is configured to reproduce the movement along the first arc path to within 0.5 inches of the first arc path at each position between the upper limit and the lower limit.
3. The wheelchair conversion vehicle of claim 1 , wherein
the upper limit is about 3 inches above the OEM ride-height and the lower limit is about 2 inches below the OEM ride-height.
4. The wheelchair conversion vehicle of claim 1 , wherein
the trailing arm substitute includes upper and lower arms.
5. The wheelchair conversion vehicle of claim 4 , wherein
the upper and lower arms each have a first end pivotably connected to the spindle and a second end pivotably connected to a floor mount.
6. The wheelchair conversion vehicle of claim 4 , wherein
the upper arm of the trailing arm substitute is shorter than the lower arm.
7. The wheelchair conversion vehicle of claim 4 , wherein
the upper arm of the trailing arm substitute is longer than the lower arm.
8. The wheelchair conversion vehicle of claim 1 , wherein
a trailing arm substitute is disposed in place of the OEM trailing arm on both sides of the vehicle.
9. The wheelchair conversion vehicle of claim 1 , wherein
the trailing arm substitute is configured to reproduce the movement along the first arc path to within 0.25 inches of the first arc path at each position between the upper limit and the lower limit.
10. The wheelchair conversion vehicle of claim 1 , wherein
the trailing arm substitute provides a rear wheel camber curve within ±0.75 degrees of an OEM rear wheel camber curve at each position between the upper limit and the lower limit.
11. The wheelchair conversion vehicle of claim 10 , wherein
the camber curve is within ±0.05 degrees per inch of the OEM camber curve.
12. The wheelchair conversion vehicle of claim 1 , wherein
the trailing arm substitute is configured to reproduce the movement within ±0.3 inches of the second arc path at each position between the upper limit and the lower limit.
13. The wheelchair conversion vehicle of claim 12 , wherein
the movement along the second arc path is within ±0.06 of an inch of the second arc path.
14. The wheelchair conversion vehicle of claim 1 , wherein the improvement further comprises
a lowered vehicle floor at least in a rear side door opening area, wherein the lowered vehicle floor is lowered at least 6 inches from the height of the OEM vehicle floor.
15. The wheelchair conversion vehicle of claim 14 , wherein
the lowered vehicle floor is lowered between 10 and 12 inches from the height of the OEM vehicle floor.
16. The wheelchair conversion vehicle of claim 1 , wherein the improvement further comprises
at least one body extension that raises the vehicle body by at least 2 inches while substantially maintaining an OEM height of the vehicle subframe, thereby substantially maintaining an OEM roll center and ground clearance of the wheelchair conversion vehicle.
17. The wheelchair conversion vehicle of claim 16 , wherein
the body is raised 3 to 6 inches.
18. The wheelchair conversion vehicle of claim 16 , wherein
an OEM roll-couple is also substantially maintained.
19. The conversion vehicle of claim 1 , wherein the improvement further comprises
a rear spring substitute disposed in place of an OEM rear suspension spring, wherein the rear spring substitute is longer than the OEM rear suspension spring and has a different spring rate than the OEM suspension spring.
20. The conversion vehicle of claim 1 , wherein the improvement further comprises
at least one front and rear body extension configured to substantially maintain an OEM height of the vehicle subframe.
21. The conversion vehicle of claim 19 , wherein the improvement further comprises
a vehicle lowering system which compresses the rear spring substitute to lower the vehicle body towards the ground, wherein the rear spring substitute returns to a pre-compression height after compression.
22. A method of manufacturing a wheelchair conversion vehicle comprising:
providing a vehicle body, a vehicle sub-frame connected to the vehicle body, an independent rear suspension including an OEM trailing arm having a first end and a second end, the OEM trailing arm being pivotally connected to the vehicle body at the first end, the independent rear suspension and the vehicle body defining an OEM ride height, a rear wheel OEM spindle fixedly connected to the second end of the OEM trailing arm and rotably connected to the vehicle body, the rear wheel OEM spindle moving through a defined first arc path via the OEM trailing arm pivoting at the first end, the movement of the rear wheel OEM spindle being further characterized by rotation of the rear wheel OEM spindle relative to the vehicle body to define a second arc path of a point on the rear wheel OEM spindle as a center of the rear wheel OEM spindle travels along the first arc path;
replacing the OEM trailing arm with a trailing arm substitute, wherein the trailing arm substitute has been altered, compared to the OEM trailing arm, so as not to protrude into a side door opening of the wheelchair conversion vehicle;
substantially reproducing the movement of the rear wheel OEM spindle along the first or second arc paths between an upper limit and a lower limit, the upper limit being a distance above the OEM ride height and the lower limit being a distance below the OEM ride height; and
installing a wheelchair access system to provide wheelchair access to the wheelchair conversion vehicle.
23. The method of claim 22 , wherein
the substantially reproducing the movement reproduces the movement along the first arc path to within 0.5 inches of the first arc path at each position between the upper limit and the lower limit.
24. The method of claim 22 , wherein
the upper limit is about 3 inches above the OEM ride-height and the lower limit is about 2 inches below the OEM ride-height.
25. The method of claim 22 , wherein
the trailing arm substitute includes upper and lower arms.
26. The method of claim 25 , wherein
the upper and lower arms each have a first end pivotably connected to the spindle and a second end pivotably connected to a floor mount.
27. The method of claim 25 , wherein
the upper arm of the trailing arm substitute is shorter than the lower arm.
28. The method of claim 25 , wherein
the upper arm of the trailing arm substitute is longer than the lower arm.
29. The method of claim 22 , wherein
the replacing the OEM trailing arm includes replacing the OEM trailing arm with a trailing arm substitute on both sides of the vehicle.
30. The method of claim 22 , wherein
the substantially reproducing the movement reproduces the movement along the first arc path to within 0.25 inches of the first arc path at each position between the upper limit and the lower limit.
31. The method of claim 22 , further comprising
providing a rear wheel camber curve within ±0.75 degrees of an OEM rear wheel camber curve at each position between the upper limit and the lower limit.
32. The method of claim 31 , wherein
the camber curve is within ±0.05 degrees per inch of the OEM camber curve.
33. The method of claim 22 , wherein
the substantially reproducing the movement reproduces the movement within ±0.3 inches of the second arc path at each position between the upper limit and the lower limit.
34. The method of claim 33 , wherein
the movement along the second arc path is within ±0.06 of an inch of the second arc path.
35. The method of claim 22 , further comprising
lowering an OEM vehicle floor at least in a rear side door opening area at least 6 inches.
36. The method of claim 35 , wherein
the OEM vehicle floor is lowered between 10 and 12 inches from the height of the OEM vehicle floor.
37. The method of claim 22 , further comprising
disposing at least one body extension that raises the vehicle body by at least 2 inches while substantially maintaining an OEM height of the vehicle subframe, thereby substantially maintaining an OEM roll center and ground clearance of the wheelchair conversion vehicle.
38. The method of claim 37 , wherein
the body is raised 3 to 6 inches.
39. The method of claim 37 , wherein
an OEM roll-couple is also substantially maintained.
40. The method of claim 22 , further comprising
replacing an OEM rear suspension spring with a rear spring substitute, wherein the rear spring substitute is longer than the OEM rear suspension spring and has a different spring rate than the OEM suspension spring.
41. The method of claim 22 , further comprising
disposing at least one front and rear body extension configured to substantially maintain an OEM height of the vehicle subframe.
42. The method of claim 22 , further comprising
installing a vehicle lowering system which compresses the rear spring substitute to lower the vehicle body towards the ground, wherein the rear spring substitute returns to a pre-compression height after compression.