Trolley with retractable wheels

Details Trolley with retractable wheels Trolley with retractable wheels

1994-09-08

1996-04-09

Focarino, Margaret A.

Land vehicles

Wheeled

Convertible

280646, 280655, 280 4718, 280 4729, B62B 112

Patent

active

055054714

ABSTRACT:
A trolley comprising a pair of vertical bars, a pair of linking bars, and a wheel assembly operable by the linking bars to pivotally move between an extended and a retracted positions. A movable block slidable on the vertical bars is connected with the linking bars. A positioning plate is fixedly mounted on the movable block and a sliding movement of the movable block relative to the vertical bars is controlled by a biasing unit in cooperation with the positioning plate. A respective compression spring is additionally provided on the vertical bars to facilitate the sliding movement of the movable block when the movable block is released to move.

REFERENCES:
patent: 4793622 (1988-12-01), Sydlow
patent: 5024458 (1991-06-01), Kazmark et al.
patent: 5306027 (1994-04-01), Cheng

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