Multi-adjustable wheelchair and frame therefor

A multi-adjustable wheelchair comprising:

• a seat frame,
• a central frame situated below the seat frame,
• a front frame component connected to the central frame for independent angular adjustment about a first pivot point in relation to the central frame, the front frame component supporting a front caster wheel, and
• a rear frame component connected to the central frame for independent angular adjustment about a second pivot point in relation to the central frame, the rear frame component supporting a rear wheel, wherein
• the independent angular adjustment of the frame components selectively provides a change in height of a front portion and a rear portion of the seat frame as well as wheelbase adjustment in a lengthwise direction, and wherein
• angular adjustment is provided with a screw jack system comprising:
• a frame adjustment bolt axially fixed in relation to the central frame,
• a cross-threaded barrel supported for pivotal movement in relation to at least one of the frame components, wherein the frame adjustment bolt is threaded through the cross-threaded barrel, the frame adjustment bolt being rotatable to adjust the angle of the at least one frame component, the angle adjustment being infinite within a range of threaded engagement provided between the frame adjustment bolt and the cross-threaded barrel.

A multi-adjustable wheelchair comprising:

• a seat frame,
• a central frame situated below the seat frame,
• a front frame component connected to the central frame for independent angular adjustment about a first pivot point in relation to the central frame, the front frame component supporting a front caster wheel, and
• a rear frame component connected to the central frame for independent angular adjustment about a second pivot point in relation to the central frame, the rear frame component supporting a rear wheel, wherein
• the independent angular adjustment of the frame components selectively provides a change in height of a front portion and a rear portion of the seat frame as well as wheelbase adjustment in a lengthwise direction, and wherein
• angular adjustment is provided with a rack and pinion configuration comprising:
• pinion teeth supported by at least one of the frame components so that the at least one frame components functions as a pinion,
• a rack body including teeth that mesh with the pinion teeth, and
• an adjustment bolt axially fixed in relation to the central frame, the adjustment bolt being threaded into the rack body, whereby upon turning the adjustment bolt, the rack teeth screw up and down to pivot the frame component to change the angle of the frame component.

A multi-adjustable wheelchair comprising:

• a seat frame,
• a central frame situated below the seat frame,
• a front frame component connected to the central frame for independent angular adjustment about a first pivot point in relation to the central frame, the front frame component supporting a front caster wheel, and
• a rear frame component connected to the central frame for independent angular adjustment about a second pivot point in relation to the central frame, the rear frame component supporting a rear wheel, wherein
• the independent angular adjustment of the frame components selectively provides a change in height of a front portion and a rear portion of the seat frame as well as wheelbase adjustment in a lengthwise direction, and wherein
• the rear frame component comprises an axle saddle for supporting an axle bar, the axle bar comprising a plurality of holes for supporting an axle tube that is dimensioned and configured to receive a rear wheel axle, the axle being received in a selected one of the plurality of holes to adjust the position of the rear wheel in relation to the axle bar to provide a change in height of the rear portion of the seat frame and provide wheelbase adjustment in the lengthwise direction.

A multi-adjustable wheelchair comprising:

• a seat frame,
• a central frame situated below the seat frame,
• a front frame component connected to the central frame for independent angular adjustment about a first pivot point in relation to the central frame, the front frame component supporting a front caster wheel,
• a rear frame component connected to the central frame for independent angular adjustment about a second pivot point in relation to the central frame, the rear frame component supporting a rear wheel, wherein
• the independent angular adjustment of the frame components selectively provides a change in height of a front portion and a rear portion of the seat frame as well as wheelbase adjustment in a lengthwise direction, and
• struts extending laterally between one or more of the central frame and frame components, the struts being adjustable, or interchangeable with struts of varying length, to provide wheelbase adjustment in a lateral direction and adjustment in width of the wheelchair.

A multi-adjustable wheelchair comprising:

• a seat frame,
• a central frame situated below the seat frame,
• a front frame component connected to the central frame for independent angular adjustment about a first pivot point in relation to the central frame, the front frame component supporting a front caster wheel, and
• a rear frame component connected to the central frame for independent angular adjustment about a second pivot point in relation to the central frame, the rear frame component supporting a rear wheel, wherein
• the independent angular adjustment of the frame components selectively provides a change in height of a front portion and a rear portion of the seat frame as well as wheelbase adjustment in a lengthwise direction, and
• an axle mount configured to be selectively positioned in a plurality of positions in relation to the rear frame component for providing fine adjustments in the rear wheel.

A multi-adjustable wheelchair comprising:

• a seat frame,
• a central frame situated below the seat frame,
• a front frame component connected to the central frame for independent angular adjustment about a first pivot point in relation to the central frame, the front frame component supporting a front caster wheel,
• a rear frame component connected to the central frame for independent angular adjustment about a second pivot point in relation to the central frame, the rear frame component supporting a rear wheel, wherein
• the independent angular adjustment of the frame components selectively provides a change in height of a front portion and a rear portion of the seat frame as well as wheelbase adjustment in a lengthwise direction, the wheelchair further comprising:
• a caster arm supported in relation to the front frame component, and
• a front frame caster wheel support coupled to a caster arm, the front frame caster wheel support supporting the front caster wheel, wherein
• the front frame caster wheel support is telescopically adjusted in length in relation to the front frame component to provide a change in the height of the front portion of the seat frame and provide wheelbase adjustment in the lengthwise direction.

A multi-adjustable wheelchair comprising:

• a seat frame,
• a central frame situated below the seat frame,
• a front frame component connected to the central frame for independent angular adjustment about a first pivot point in relation to the central frame, the front frame component supporting a front caster wheel,
• a rear frame component connected to the central frame for independent angular adjustment about a second pivot point in relation to the central frame, the rear frame component supporting a rear wheel, wherein
• the independent angular adjustment of the frame components selectively provides a change in height of a front portion and a rear portion of the seat frame as well as wheelbase adjustment in a lengthwise direction, the wheelchair further comprising:
• a caster arm supported in relation to the front frame component, and
• a front frame caster wheel support coupled to a caster arm, the front frame caster wheel support supporting the front caster wheel, and
• a caster housing supporting the front caster wheel in relation to the front frame caster wheel support, the caster housing being angle adjustable about a central pivot to adjust the angle of a spindle of the front caster wheel.