Embodiments of the present disclosure include a wheelchair configured to reposition an occupant between a lowered and a raised position. The wheelchair can include a frame, a seat moveable relative to the frame, a drive wheel, and one or more pairs of arm assemblies. The arm assembly includes a whee
Embodiments of the present disclosure include a wheelchair configured to reposition an occupant between a lowered and a raised position. The wheelchair can include a frame, a seat moveable relative to the frame, a drive wheel, and one or more pairs of arm assemblies. The arm assembly includes a wheel configured to move from a first spatial location when the wheel chair is operating on flat, level ground to a second spatial location that is different than the first spatial location. Arm limiters that can selectively engage the arm assembly dependent on the position of the arm assembly and surface conditions of ground and can limit the range of motion of the arm assembly and sometimes other operational aspects of the chair.
대표청구항▼
1. A powered wheelchair comprising: a frame;a drive wheel coupled to the frame and rotatable about a drive wheel axis;a drive configured to apply a torque to the drive wheel;a front wheel coupled to the frame at a pivot axis, the front wheel being rotatable about a front wheel axis positioned forwar
1. A powered wheelchair comprising: a frame;a drive wheel coupled to the frame and rotatable about a drive wheel axis;a drive configured to apply a torque to the drive wheel;a front wheel coupled to the frame at a pivot axis, the front wheel being rotatable about a front wheel axis positioned forward of the drive wheel and moveable relative to the drive wheel axis, wherein, when the powered wheelchair is operating on level ground, the pivot axis is below a line that intersects the front wheel axis and the drive wheel axis;a rear wheel coupled to the frame, the rear wheel being rotatable about a rear wheel axis positioned rearward of the drive wheel and moveable relative to the drive wheel axis; anda limiter configured to restrict movement of the front wheel relative to the drive wheel axis in an engaged configuration and not restrict movement of the front wheel relative to the drive wheel axis in a disengaged configuration, the limiter transitionable from the disengaged configuration to the engaged configuration when the front wheel is in a first position relative to the drive wheel axis and prevented from transitioning from the disengaged configuration to the engaged configuration when the front wheel is in a second position relative to the drive wheel axis. 2. The powered wheelchair of claim 1, further comprising: a lift coupled to the frame and having a raised position and a lowered position, the lift extending further from the frame in the raised position than in the lowered position, wherein having the lift in the raised position causes the limiter to transition from the disengaged configuration to the engaged configuration when the front wheel is in the first position. 3. The powered wheelchair of claim 2, further comprising at least one sensor configured to detect whether the limiter is in the engaged configuration. 4. The powered wheelchair of claim 3, wherein the limiter includes the at least one sensor. 5. The powered wheelchair of claim 3, further comprising at least one controller in communication with the at least one sensor. 6. The powered wheelchair of claim 5, wherein the controller is configured to receive input from an input device and the at least one sensor, and based on the input from the input device and from the at least one sensor, to selectively operate the powered wheelchair in (i) a standard mode when a seat coupled to the lift is in the lowered position such that the powered wheelchair is moveable in accordance with standard drive parameters, and (ii) one or more elevated motion modes whereby the seat is in the raised position and the powered wheelchair is moveable in accordance with limited drive parameters, which are limited relative to the standard drive parameters. 7. The powered wheelchair of claim 5, further comprising a seat coupled to the lift, and a seat lift sensor in communication with the controller, the seat lift sensor configured to detect whether the seat is elevated from the lowered position. 8. The powered wheelchair of claim 1, further comprising a front arm assembly, the front arm assembly having a front arm member to which the front wheel is coupled, and the limiter is an elongate structure that is coupled to the frame at a pivot, such that (i) in the disengaged configuration the limiter is not engaged with the front arm assembly and the limiter provides no limitation of motion of the front arm member, and (ii) in the engaged configuration the limiter is pivoted relative to the disengaged configuration to a position that limits movement of the front arm assembly. 9. The powered wheelchair of claim 8, wherein the front arm assembly includes a caster assembly and the front wheel is in contact with ground during steady speed operation on flat and level ground. 10. The powered wheelchair of claim 8, wherein when the limiter is in the disengaged configuration, a wheelchair speed of the powered wheelchair is unrestricted by a controller while a seat coupled to a lift is in a lowermost position. 11. The powered wheelchair of claim 10, wherein when the limiter is in the engaged configuration and the seat is not in the lowermost position, the wheelchair speed is limited to a maximum raised-seat drive speed. 12. The powered wheelchair of claim 11, wherein the maximum raised-seat drive speed is no more than 5.0 mph. 13. The powered wheelchair of claim 11, wherein the maximum raised-seat drive speed is no more than 3.75 mph. 14. The powered wheelchair of claim 11, wherein when the limiter is not in the engaged configuration and the seat is not in the lowermost position, the wheelchair speed is limited to a reduced raised-seat drive speed that is less than the maximum raised-seat drive speed. 15. The powered wheelchair of claim 14, wherein the reduced raised-seat drive speed is no more than 3.0 mph. 16. The powered wheelchair of claim 14, wherein the reduced raised-seat drive speed is no more than 1.5 mph. 17. The powered wheelchair of claim 8, wherein the front arm member is elongate along an axis, and the front arm member is curved as it extends along the axis. 18. The powered wheelchair of claim 6, wherein the controller is configured to receive the input from the input device and the at least one sensor, and based on the input from the input device and from the at least one sensor, to selectively operate the powered wheelchair in at least one of (i) a maximum raised-seat drive speed range, and (ii) a maximum raised-inhibited drive speed range that is less than the maximum raised-seat drive speed range. 19. The powered wheelchair of claim 6, wherein the controller is configured to receive the input from the input device and the at least one sensor, and based on the input from the input device and from the at least one sensor, to selectively operate the powered wheelchair in at least one of (i) a maximum raised-seat drive speed range, and (ii) a maximum raised-inhibited drive speed range that is less than the maximum raised-seat drive speed range. 20. The powered wheelchair of claim 19, wherein the maximum raised-inhibited drive speed range is 0 miles per hour to 5.0 miles per hour and the maximum raised-inhibited drive speed range is 0 miles per hour to 3.75 miles per hour. 21. The powered wheelchair of claim 6, wherein the controller is configured to receive input from the at least one sensor to permit operation of the powered wheelchair only up to a maximum raised-inhibited drive speed range that is less than a maximum drive speed of the powered wheelchair. 22. The powered wheelchair of claim 1, wherein the limiter is transitionable between the engaged configuration and the disengaged configuration when the front wheel is in the first position. 23. The powered wheelchair of claim 1, further comprising a biasing member coupled to the frame and coupled to the limiter, the biasing member configured to urge the limiter toward the engaged configuration when the limiter is prevented from transitioning from the disengaged configuration to the engaged configuration.
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이 특허에 인용된 특허 (95)
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