Door locking mechanism for coke oven door

A door locking mechanism for locking doors, particularly coke oven doors of the type wherein when in the locked position the door is pressed against a door frame by spring pressure and held in such position by a locking bar engaged against hooks on the door frame, said mechanism comprising:

• an integral and single-piece bolt having an inner end adapted to be threaded into a door body of a door to be locked and an outer end;
• a sleeve element axially slidably mounted about said bolt;
• a locking bar rotatably mounted about said sleeve element with said outer end of said bolt extending outwardly beyond said locking bar, said locking bar having arms adapted to be engaged behind hooks of a door frame of the door to be locked to lock the door;
• spring means supported by said bolt and urging said sleeve element and said locking bar outwardly of said bolt toward said outer end thereof;
• said sleeve element being movable axially of said bolt toward said inner end thereof to compress said spring means and to thus release the pressure of said spring means from said locking bar, such that said locking bar can be rotated;
• means, threaded onto said outer end of said bolt at a position outwardly of said locking bar and contacting said sleeve element, for selectively axially displacing said sleeve element with respect to said bolt and for thereby adjusting the spring pressure of said spring means applied to said locking bar;
• and
• means, at said outer end of said bolt and positioned outwardly of said locking bar, for selectively rotating and axially displacing said bolt with respect to the door and thereby adjusting the circumferential position of said locking bar with respect to the hooks of the door frame, said bolt rotating means being freely accessible from the exterior without removal of said sleeve element displacing means.