Enhanced self-closing lid for containers

A container comprising:

• a cargo bay for holding items;
• a lid configured to slide from a closed position to an open position relative to the cargo bay, and from the open position to the closed position;
• a detent mechanism operatively connected to the lid and configured to move vertically in a first direction toward the lid as the lid slides from the closed position to the open position, and to move vertically in a second direction opposite the first direction as the lid slides from the open position to the closed position;
• and
• arms operatively attached to rollers and to one or more tension devices,
• wherein when the detent mechanism moves vertically in the first direction, the detent mechanism is configured to separate the rollers and cause the arms to pull the one or more tension devices by causing first rotation of the arms, and
• wherein when the detent mechanism moves vertically in the second direction, the one or more tension devices are configured to cause second rotation of the arms, the second rotation opposite the first rotation.

A delivery robot comprising a container, the container comprising:

• a cargo bay for holding items;
• a bi-folding lid configured to slide from a closed position to an open position relative to the cargo bay, and from the open position to the closed position;
• and
• a detent mechanism operatively connected to the bi-folding lid and configured to provide a hold-open force on the bi-folding lid when the bi-folding lid is at one or more open positions,
• wherein the detent mechanism is configured to move in a first direction toward the bi-folding lid as the bi-folding lid slides from the closed position to the open position, and to move in a second direction opposite the first direction as the bi-folding lid slides from the open position to the closed position;
• and further comprising:
• arms operatively attached to rollers and to one or more tension devices,
• wherein when the detent mechanism moves in the first direction, the detent mechanism is configured to separate the rollers and cause the arms to pull the one or more tension devices by causing first rotation of the arms, and
• wherein when the detent mechanism moves in the second direction, the one or more tension devices are configured to cause second rotation of the arms, the second rotation opposite the first rotation.