| 摘要 |
In a chair which can change the height of its seat by changing cross angles formed by a pair of first leg members and a pair of second leg members which are rotatably connected with each other at intermediate portions thereof respectively, a caster mounting member is mounted on a lower end portion of each leg member to be rotatable about a horizontally directed axis, and a rotary yoke of a caster is mounted on the caster mounting member to be rotatable about a vertically directed axis. The caster mounting member is connected with a leg mounting member by a connecting link, thereby defining a parallel crank mechanism by the leg member, the leg mounting member, the caster mounting member and the connecting link. Thus, the casters which are mounted on lower end portions of at least either the first or second leg members can regularly serve functions thereof properly regardless of change in inclination of the leg members.
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