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19 Moreover, it can seen that suspension system 10 is economical to make and install, reliable in use, and lightweight and easy to maintain.
18 Thus, it can be seen that the suspension system 10 of the present invention is useful on wheelchairs of any type to provide shock absorption and stability to the wheelchair when bumps, depressions or other irregularities in the travel surface of the wheelchair is encountered.
17 This substantially vertical axle displacement also aids in keeping all of the wheels of the wheelchair in contact with the travel surface, to maintain the stability and steering control of the wheelchair.
16 In accordance with one of the main features of the present invention, it should be understood that the displacement of axle 13 in a substantially vertical direction when a bump or depression is encountered in the travel surface of wheelchair 11, is an important factor in maintaining the center of gravity of the occupied wheelchair.
15 Elongated section 35 of each arm 18 again remains parallel to the elongated section of the other arm, thereby enabling a relatively large amount of horizontal travel D+x of the axle, again resulting in efficient absorption of up to 50% of the shock by suspension assembly 15.
14 This pivoting action causes arms 18a, b to visibly move farther apart from distance A to distance A+z, and spring 19 correspondingly is placed under tension to absorb the shock of wheel 28 dropping into the depression.
13 Turning now to FIG. 6B, it can be seen that when one or both wheels 28 of wheelchair 11 encounters a depression in the travel surface of the wheelchair, arms 18 again pivot about brackets 16, 17 at fasteners 42 as axle 13 moves downward in response to the depression.
12 This pivoting action causes arms 18a, b to visibly move close together from distance A (FIG. 5) to distance A-z, where z is variable, and spring 19 correspondingly is compressed to absorb the shock of wheel 28 moving over the bump.
11 An isolation plate 60 is disposed between and interconnects top and bottom members 61, 62 to provide additional stability to spring 19.
10 It should further be appreciated that the depth of insertion of each extension tube 14 within its respective frame tube 44 determines the front-rear position of wheels 28 relative to frame 12 and seat 25, thereby determining the center of gravity of wheelchair 11.

ÀÌÀü10ÆäÀÌÁö [11] [12] [13] [14] [15]

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