Movable chair device and chair assembly

A chair assembly, comprising a support, and a movable chair device, wherein the movable chair device comprises a chair mechanism and a transmission mechanism, and the transmission mechanism comprises a primary transmission component and an intermediate transmission component;

• the primary transmission component comprises:
• a fixing member configured for fixing to the support;
• a first swing arm pivotally connected to the fixing member;
• a second swing arm pivotally connected to the fixing member;
• and
• a first linkage member pivotally connected to the first swing arm and the second swing arm respectively, wherein the first linkage member is enclosed with the first swing arm, the second swing arm and the fixing member to form a closed-loop connecting rod mechanism;
• and
• the intermediate transmission component comprises:
• a first transmission arm, a first end of which is pivotally connected to the first swing arm and a second end of which is pivotally connected to the chair mechanism;
• a second transmission arm, a first end of which is pivotally connected to the second swing arm and a second end of which is pivotally connected to the chair mechanism;
• and
• a third transmission arm, a first end of which is pivotally connected to the second transmission arm, and a second end of which is movably connected to the first transmission arm and/or the first swing arm;
• and
• the support is capable of being placed on the ground and is fixedly connected to the fixing member.