| 摘要 |
The step ladder-stool can be applied in the house for access to racks and shelves and for sitting. It can be served and has improved ergonomy and extended access to heights. It consists of four legs - two front (1) and two rear (2), fixed step (3), upper mobile step (4) and seat (5) pivotly connected to it. It contains a pantograph which consists of two vertical long arms (6), two horizontal, longitudinal profiles (7), two lower and two upper (8 & 9) parallel arms and two lower short and two upper short (10 & 11) vertical arms. Profiles (7) are fixed to legs (1 & 2), and the fixed step (3) is fixed on their front part. The upper mobile step (4) is mounted on the upper parallel arms (9). Seat (5) is fixed to the upper short vertical arms (11). A lower mobile step (12) is mounted to the lower parallel arms (8), to the external side of one of which there is a lock (13) fixed in extended position by a lateral profile (14) to one of the front legs (1). (11) 38
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