Arm support apparatus

An arm support apparatus to be installed on a reference plane for supporting an arm of an operator, the arm support apparatus comprising:

• a mount on which a part of the arm of the operator is mountable;
• a support member including a plurality of links and a plurality of joints each rotatably supporting at least one of the plurality of links, the support member supporting the mount to be movable based on rotation of at least one of the plurality of links around a corresponding at least one of the plurality of joints, the plurality of joints providing several degrees of freedom, the several degrees of freedom including at least one specified degree of freedom around an axis of at least one joint in the plurality of joints, the axis of the at least one joint being directed to cross a vertical direction of the reference plane;
• and
• a weight attachment provided for at least one specified link in the plurality of links, the at least one specified link being associated with the at least one specified degree of freedom, the weight attachment being configured such that one or more weight members are attachable thereto, when the one or more weight members are attached to the weight attachment, the weight attachment being configured to substantially balance in weight with the mount on which the part of the arm is mounted while applying supporting force to the part of the arm mounted on the mount, wherein:
• the one or more weight members are a plurality of weight members, and the plurality of weight members have a reference line passing through predetermined points thereof;
• the weight attachment is configured such that a minimum distance between the reference line and the at least one specified link is adjustable;
• and
• the plurality of weight members are removably attached to the weight attachment, so that the plurality of weight members can be increased or decreased in number.