Patent ID: 7631459

Claim:
A method of controlling the swinging of a gate in a box comprising the steps of: a. swinging the gate without restriction from a closed position to an open position; b. controlling the gate to swing from the open position to a release position; and c. swinging the gate freely from the release position to the closed position by: i. providing a fluid cylinder having a cylinder pin; ii. receiving the cylinder pin in a selected one of a first and second slots of an L-shaped slot when the gate swings from the open position toward the closed position; and iii. releasing the selected slot of the L-shaped slot from the cylinder pin when the gate is at the release position thereof by: i. providing a trip lever and a stop arm on the cylinder pin; ii. contacting the trip lever with the box, and contacting the stop arm with the mounting plate; and iii. holding the cylinder pin stationary relative to the box, and sliding the selected slot over the cylinder pin until the junction of the L-shaped slot is at the cylinder pin and thereby releases the selected slot from the cylinder pin.