Expandable and retractable wheel assembly
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United States of America Patent
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Sep 8, 2020
Grant Date -
May 9, 2019
app pub date -
Nov 9, 2017
filing date -
Nov 9, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
An expandable and retractable wheel assembly in accordance with one or more embodiments includes a hub structure having a circular periphery and a rim expandable in circumference from a retracted circular position to one or more expanded circular positions. The rim engages and is supported by the circular periphery of the hub structure when in the retracted position. A plurality of linear actuators is attached to and supported by the hub structure. Each linear actuator includes a piston rod and a drive system for moving the piston rod from a retracted position to one or more extended positions, wherein a distal end of the piston rod engages and moves the rim when the piston rod is extended and also supports the rim in the one or more expanded rim positions.
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