A vacuum system for use in excavation operations. The system uses a tank having an open end that is closed by a door. The door is opened and closed by a door lifting assembly made up of an upper linkage arm, a lower linkage arm and a hydraulic cylinder. A socket is formed in the upper linkage arm, and a shaft housing is formed in the lower linkage arm. The shaft housing engages with the socket to latch the door closed. The upper linkage arm is attached to the door at a first pivot axis and is attached to the lower linkage arm at a second pivot axis. The lower linkage arm is attached to a side of the tank at a third pivot axis. When the door is open, the second pivot axis extends below a reference plane that contains the first and third pivot axis.

A latch mechanism includes a hook, a displaceable handle, and links connected between the handle and hook for the operation of the latch mechanism. The handle and links cooperate with the hook to hold the latch mechanism in a locked position.

A latch includes a latch housing including a first housing portion and a second housing portion separable from the first housing portion. The second housing portion includes a keeper. A first arm member is in rotational communication with the first housing portion. The first arm member is configured to rotate about a first axis between a first position and a second position. A second arm member is in rotational communication with the first arm member. A latch load pin is in rotational communication with the first arm member about a second axis. The latch load pin is configured to mate with the keeper with the first arm member in the first position. The second arm member in the first position is configured to be fixed relative to the first arm member as the first arm member rotates from the first position toward the second position.

A lever-lock release system is configured to releasably couple two objects together, for example a parachute and a payload. The lever-lock release system may comprise a first lever and a second lever, each rotatably coupled to a rigid base. When activated, the levers cascadingly rotate to release a first object and a second object. With these systems and related methods, various failure modes may be eliminated, such as undesired premature deployment of recovery parachutes during aerial delivery.

A lever-lock release system is configured to releasably couple two objects together, for example a parachute and a payload. The lever-lock release system may comprise a first lever and a second lever, each rotatably coupled to a rigid base. When activated, the levers cascadingly rotate to release a first object and a second object. With these systems and related methods, various failure modes may be eliminated, such as undesired premature deployment of recovery parachutes during aerial delivery.

A latch mechanism includes a hook, a displaceable handle, and links connected between the handle and hook for the operation of the latch mechanism. The handle and links cooperate with the hook to hold the latch mechanism in a locked position.

A latch includes a latch housing including a first housing portion and a second housing portion separable from the first housing portion. The second housing portion includes a keeper. A first arm member is in rotational communication with the first housing portion. The first arm member is configured to rotate about a first axis between a first position and a second position. A second arm member is in rotational communication with the first arm member. A latch load pin is in rotational communication with the first arm member about a second axis. The latch load pin is configured to mate with the keeper with the first arm member in the first position. The second arm member in the first position is configured to be fixed relative to the first arm member as the first arm member rotates from the first position toward the second position.

The present invention discloses a thermal box comprising a body; the body comprises a box body, a box cover and locking devices provided on a front side and a rear side of the body respectively; the snap fastening seat is fixed on the box body; two extended lugs are provided on the box cover; the snap fastening seat is provided with a pivot seat between the two extended lugs; two mounting lugs are provided on a top side of the snap fastening member; the two extended lugs are positioned between the two mounting lugs and interconnected thereto via a rotating shaft to rotate inwards and outwards; a fastening structure which fastens by pressing inwards and unfastens by pulling outwards is provided on the inner side of the snap fastening member and the snap fastening seat.

A latch including a housing having side members each having an elongated slot, a bolt mounted rotatably to the housing and positioned between the side members of the housing, a trigger mounted rotatably to the housing, and a pin and roller positioned slidably within the elongated slots of the side members of the housing. The bolt is moveable between a first, closed position and a second open position. The trigger is moveable between a first position, in which the pin and roller are engaged with the bolt when the bolt is in its first position, and a second position, in which the pin and roller are disengaged from the bolt. The latch can be opened automatically when a defined load is provided on the bolt, or manually by depressing the trigger to disengage the pin and roller from the bolt.

A lever-lock release system is configured to releasably couple two objects together, for example a parachute and a payload. The lever-lock release system may comprise a first lever and a second lever, each rotatably coupled to a rigid base. When activated, the levers cascadingly rotate to release a first object and a second object. With these systems and related methods, various failure modes may be eliminated, such as undesired premature deployment of recovery parachutes during aerial delivery.