Self releasing cable system

A lifting system, comprising:

• a hoist;
• a cable having a first end and second end and attached to the hoist at the first end;
• and
• an attachment device, comprising:
• a housing;
• a latch positioned inside the housing, the latch biased to an open position;
• a first biasing surface disposed on the latch and operable to bias the latch to a closed position when the attachment mechanism is moved by the hoist into contact with an object in a first direction;
• and
• a second biasing surface disposed on the latch and operable the bias the latch to a closed position when the attachment mechanism is moved by the hoist into contact with an object in a second direction.

A platform, comprising:

• a platform deck;
• at least one winch disposed on the platform deck;
• a cable having a first end and second end and attached to the hoist at the first end;
• and
• an attachment device, comprising:
• a housing;
• a latch positioned inside the housing, the latch biased to an open position;
• a first biasing surface disposed on the latch and operable to bias the latch to a closed position when the attachment mechanism is moved by the winch into contact with an object in a first direction;
• and
• a second biasing surface disposed on the latch and operable the bias the latch to a closed position when the attachment mechanism is moved by the winch into contact with an object in a second direction.