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An adjustable lumbar back support system mountable across the back rest of a foldable wheelchair. The system is adjustable vertically and includes two cam members eccentrically mounted on an elongated member to selectively provide fore and aft adjustment as well as side to side adjustment. Additiona

An adjustable lumbar back support system mountable across the back rest of a foldable wheelchair. The system is adjustable vertically and includes two cam members eccentrically mounted on an elongated member to selectively provide fore and aft adjustment as well as side to side adjustment. Additionally, pads can be mounted on the cam members to provide a further range of support to the system. The system provides rigidity to foldable wheelchairs and pivots out of the way when the wheelchair is collapsed. The system is also lightweight and unobtrusive and may be retrofitted to most existing styles of wheelchairs.

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An adjustable back support system for use with a wheelchair, said wheelchair having a flexible back rest extending between two upright back posts and said system providing adjustable support for the lumbar region of the back of the wheelchair occupant, said support system including: an elongated mem

An adjustable back support system for use with a wheelchair, said wheelchair having a flexible back rest extending between two upright back posts and said system providing adjustable support for the lumbar region of the back of the wheelchair occupant, said support system including: an elongated member extending along a first axis and means for mounting said elongated member to said wheelchair with the first axis thereof substantially horizontal and with said elongated member extending substantially across the flexible back rest of said wheelchair between said two upright back posts and on the opposite side of said back rest from the wheelchair occupant, and at least two cam members eccentrically mounted about said elongated member and means for adjustably positioning each of said cam members about and along said elongated member, said positioning means including means for selectively varying the position of each eccentric cam member about the first axis of said elongated member to selectively increase and decrease the lumbar support provided to the wheelchair occupant, said positioning means further including means for selectively varying the position of each cam member along the first axis of said elongated member relative to each other and to said elongated member to provide additional adjustability to the lumbar support provided to the wheelchair occupant.