Coke oven door lifter mechanism

Claim 1

A coke oven door lifter for a coke oven door having a horizontal support bar, comprising a coke oven door having a horizontal support bar, a door lifter housing having a vertical trackway, a movable member guided on said trackway for vertical upward and downward movement therealong, a support arm carried by said movable member engageable with the horizontal support bar of the coke oven door to lift it when said movable member is moved upwardly, a locking bar release member movably mounted on said movable member, first fluid pressure operable means connected to said movable member to displace it along said trackway, a locking bar carried by said door and being movable between a latching and unlatching position, spring means biasing said locking bar into an unlatching position, said bar being movable by said locking bar release member against said biasing means to an unlatching position, second fluid pressure operable means connected to said locking bar release member to displace said locking bar release member when said movable member is in a raised position and engaged with said support bar to engage said locking bar and move it to an unlatching position to release said door and third fluid pressure operated means engageable with said door lifter housing to displace said housing toward and away from the coke oven door.