摘要 |
PROBLEM TO BE SOLVED: To provide an elevatable legless chair that can adjust precisely the position of a seat at a desired height and is superior in strength and durability, and is compact and low in cost. SOLUTION: The legless chair comprises a pair of an upper and lower rocking arms 21 parallel to each other that are axially fitted to a base 11 and made capable of rising and falling by their upward and downward rocking movement, a seat 31 that is axially fitted relatively rotatably to the rocking arms on the opposite end sides of the base side fitting ends of the rocking arms, a rotating member 41 that is rotatably fitted by a rotating center axle parallel with a fitting axle to the base and a seat fitting axle between the fitting position to the base 11 and the seat fitting positions of the rocking arms, a screw hole 45 formed on the rotating member at right angle with the rotating center axle of the rotating member 41, a shaft with a screw 51 on outer circumference of which the screw for screwing to the screw hole of the rotating member is formed, and a drive device of the shaft with the screw that has a forward-and-reverse rotation drive part of the shaft with the screw and is fitted to the base 11 upward and downward rockably. COPYRIGHT: (C)2004,JPO
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