초록 ▼

A support frame assembly including at least one pair of generally vertical spaced uprights joined together by transversely extending structural members and having caster wheel support members for supporting a rotatably mounted caster wheel mounted axle and a pedal actuatable lever engaging the axle

A support frame assembly including at least one pair of generally vertical spaced uprights joined together by transversely extending structural members and having caster wheel support members for supporting a rotatably mounted caster wheel mounted axle and a pedal actuatable lever engaging the axle to allow selective movement of the caster wheel mounted axle between "mobile" and "use" mode conditions--the invention further including a joined second pair of generally vertical spaced uprights each having a caster wheel support member for yieldably supporting a caster wheel arrangement for selective movement between "mobile" and "use" modes.

대표청구항 ▼

[ The invention claimed is:] [1.] In a support frame structural assembly including at least one pair of generally vertically extending spaced uprights connected by transversely extending cross-beam members, a structural support means for selectively adjusting said support frame between a stationary

[ The invention claimed is:] [1.] In a support frame structural assembly including at least one pair of generally vertically extending spaced uprights connected by transversely extending cross-beam members, a structural support means for selectively adjusting said support frame between a stationary "use" mode and a movable "mobile" mode condition comprising: caster wheel support means connected to the lower portion of said structural support means; pivotal axle means pivotally mounted on said structural support means and including caster wheel means mounted on said pivotal axle means; leverage means pivotally mounted on said structural support means with a portion thereof in directly cooperative engagement with said pivotal axle means; actuating means cooperative with said leverage means and said pivotal axle means to provide for direct pivotal movement of said axle means and said caster wheel means mounted thereon between said support frame "use" mode and said support frame "mobile" mode conditions; and, yieldable restraining means including spring means to allow movement of said caster wheel means to a mobile mode condition and to yieldingly restrain said caster wheel means when in a "use" mode condition.