Mobility for delivery

A mobility for delivering articles, the mobility comprising:

• a frame defining a body of the mobility, the frame comprising:
• an up-down extension area having a shape extending in an up-down direction, the up-down extension area comprising:
• a front up-down extension area disposed at a front of the frame;
• and
• a rear up-down extension area disposed at a rear of the frame;
• and
• a front-rear extension area having a shape extending in a front-rear direction, the front-rear extension area comprising:
• an upper front-rear extension area configured to connect an upper end of the front up-down extension area and an upper end of the rear up-down extension area;
• and
• a lower front-rear extension area configured to connect a lower end of the front up-down extension area and a lower end of the rear up-down extension area;
• a chain member coupled to a first side of the frame, wherein the chain member:
• has a closed curve shape along the up-down direction;
• is movable relative to the frame;
• and
• comprises a standby section provided at a fixed position with respect to the frame irrespective of a movement of the chain member, wherein the standby section comprises a plurality of bent areas;
• and
• comprises a first chain member having the closed curve shape extending sequentially along longitudinal directions of the front up-down extension area, the upper front-rear extension area, the rear up-down extension area, and the lower front-rear extension area;
• a tray member having a first side coupled to the chain member, the tray member being movable in connection with a movement of the chain member;
• a wheel coupled to a lower portion of the frame;
• a driver configured to provide a driving force to the chain member;
• and
• a coupling unit coupled to the first side of the frame and comprising one or more rotary members provided revolvably, wherein the standby section of the chain member comprises sections configured to engage with the rotary members of the coupling unit.