Retractable vehicle step
A retractable step for use with a vehicle comprises a stepping member having an upper stepping surface, a first arm, and a second arm. The first arm has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The second arm also has a first end pivotally attached to the vehicle, and a second end pivotally attached to the stepping member. The first and second arms can be generally planar linkages.
1. A retractable vehicle step system comprising:
a frame configured to connect to an underbody of a vehicle;
a stepping member comprising a stepping deck;
at least two linkages pivotally coupling the stepping member to the frame; and
a drive system comprising a motor configured to cause the stepping deck to move with respect to the frame between a retracted position and an extended position, the extended position being downward and outboard of the retracted position,
wherein the at least two linkages comprises a first linkage having a proximal end and a distal end, the proximal end pivotally coupled to the frame at a first axis,
wherein the distal end of the first linkage comprises a first bearing member, a second bearing member, and a rigid crosspiece that rigidly interconnects the first bearing member to the second bearing member, the first bearing member and the second bearing member each being pivotally coupled to the stepping member at a second axis that is parallel to the first axis, and
wherein the first bearing member and the second bearing member each protrude distally from the rigid crosspiece, the first bearing member comprising an inner surface that is spaced apart along the second axis from an inner surface of the second bearing member.
2. The retractable vehicle step system of claim 1 , further comprising a pin that extends along the second axis, the pin engaging the first bearing member, the second bearing member, and the stepping member.
3. The retractable vehicle step system of claim 2 , wherein the at least two linkages further comprises a second linkage having a proximal end and a distal end, the distal end of the second linkage comprising a third bearing member, a fourth bearing member, and a second rigid crosspiece that rigidly interconnects the third bearing member to the fourth bearing member, the third bearing member and the fourth bearing member each being pivotally coupled to the stepping member at a third axis that is parallel to the first axis, and
wherein the third bearing member and the fourth bearing member each protrude distally from the second rigid crosspiece, the third bearing member comprising an inner surface that is spaced apart along the third axis from an inner surface of the fourth bearing member.
4. The retractable vehicle step system of claim 3 , further comprising a second pin that extends along the third axis, the second pin engaging the third bearing member, the fourth bearing member, and the stepping member.
5. The retractable vehicle step system of claim 1 , wherein the drive system further comprises a gear system configured to convert a rotational output of the motor into a motion that causes the stepping deck to move with respect to the frame between the retracted position and the extended position, wherein the rotational output of the motor is positioned to rotate about an axis that is perpendicular to the first axis.
6. The retractable vehicle step system of claim 1 , wherein the stepping member comprises a support bracket connected to the stepping deck, and wherein the first bearing member and the second bearing member of the distal end of the first linkage are pivotally coupled to the support bracket of the stepping member at the second axis.
7. The retractable vehicle step system of claim 1 , wherein the rigid crosspiece defines a distal surface extending between said first bearing member and said second bearing member.
8. The retractable vehicle step system of claim 1 , wherein the second axis is positioned inboard of and above the stepping deck when the stepping deck is in the extended position.
9. The retractable vehicle step system of claim 1 , further comprising:
a second frame; and
at least two additional linkages pivotally coupling the stepping member to the second frame,
wherein the at least two additional linkages are spaced apart from the at least two linkages along a length of the stepping member.
10. The retractable vehicle step system of claim 1 , wherein the drive system is configured to cause the stepping deck to move from the retracted position to the extended position in response to a door of the vehicle being opened.
11. A vehicle comprising:
an underbody;
a frame rigidly connected to the underbody;
a stepping member comprising a stepping deck;
at least two linkages pivotally coupling the stepping member to the frame; and
a drive system comprising a motor configured to cause the stepping deck to move with respect to the frame between a retracted position and an extended position, the extended position being downward and outboard of the retracted position,
wherein the at least two linkages comprises a first linkage having a proximal end and a distal end, the proximal end pivotally coupled to the frame at a first axis,
wherein the distal end of the first linkage comprises a first bearing member, a second bearing member, and a rigid crosspiece that rigidly interconnects the first bearing member to the second bearing member, the first bearing member and the second bearing member each being pivotally coupled to the stepping member at a second axis that is parallel to the first axis, and
wherein the first bearing member and the second bearing member each protrude distally from the rigid crosspiece, the first bearing member comprising an inner surface that is spaced apart along the second axis from an inner surface of the second bearing member.
12. The vehicle of claim 11 , further comprising a pin that extends along the second axis, the pin engaging the first bearing member, the second bearing member, and the stepping member.
13. The vehicle of claim 12 , wherein the at least two linkages further comprises a second linkage having a proximal end and a distal end, the distal end of the second linkage comprising a third bearing member, a fourth bearing member, and a second rigid crosspiece that rigidly interconnects the third bearing member to the fourth bearing member, the third bearing member and the fourth bearing member each being pivotally coupled to the stepping member at a third axis that is parallel to the first axis, and
wherein the third bearing member and the fourth bearing member each protrude distally from the second rigid crosspiece, the third bearing member comprising an inner surface that is spaced apart along the third axis from an inner surface of the fourth bearing member.
14. The vehicle of claim 13 , further comprising a second pin that extends along the third axis, the second pin engaging the third bearing member, the fourth bearing member, and the stepping member.
15. The vehicle of claim 11 , wherein the drive system further comprises a gear system configured to convert a rotational output of the motor into a motion that causes the stepping deck to move with respect to the frame between the retracted position and the extended position, wherein the rotational output of the motor is positioned to rotate about an axis that is perpendicular to the first axis.
16. The vehicle of claim 11 , wherein the stepping member comprises a support bracket connected to the stepping deck, and wherein the first bearing member and the second bearing member of the distal end of the first linkage are pivotally coupled to the support bracket of the stepping member at the second axis.
17. The vehicle of claim 11 , wherein the rigid crosspiece defines a distal surface extending between said first bearing member and said second bearing member.
18. The vehicle of claim 11 , wherein the second axis is positioned inboard of and above the stepping deck when the stepping deck is in the extended position.
19. The vehicle of claim 11 , further comprising:
a second frame rigidly connected to the underbody; and
at least two additional linkages pivotally coupling the stepping member to the second frame,
wherein the at least two additional linkages are spaced apart from the at least two linkages along a length of the stepping member.
20. The vehicle of claim 11 , wherein the drive system is configured to cause the stepping deck to move from the retracted position to the extended position in response to a door of the vehicle being opened.