Patent GB-292539-A (GB)
Title: Electrically operated closing means for vertical-chamber ovens
IPC: C10B25/10
Filed: 1928-06-21
Abstract: 292,539. Bamag-Meguin Akt.-Ges. June 21, 1927, [Convention date]. Discharging. - Apparatus for operating the hinged discharge doors at the lower ends of the fuel chambers of a vertical coke oven is so arranged that, after the door has dropped freely into the vertical position on release of a bolt, it is carried beyond this position by the switching on of an electric motor, being positively returned to the closed position when the current is again switched on. As shown, each door 17 is carried by forks 16 secured to a shaft 15, the ends 42 of the forks being adapted for engagement by a block 19 which is moved into position to hold the door closed by the turning of a shaft 21 by a lever 20. In front of the series of doors 17 is a rail 12 composed of two channel bars movable longitudinally on rollers by a crank 9 driven from the motor 2, a resilient connecting-rod 11 being employed to facilitate passage of the crank over the dead positions. In connection with each door 17 is a rack 13 loosely supported on the rail 12 with which it may be operatively connected to rotate with the pinion 14 and shaft 15 by the insertion of a pin 34, Fig. 8, into registering holes in the rail and rack. An eccentric pin 35, connected to a handle 36, is provided adjacent each rack to enable the holes to be brought into proper register for inserting the pin 34. The motor 2 drives, through reducing gearing 7, the shaft 8, Fig. 4, which is connected to crank 9 by a spring clutch 10 adapted to be engaged on starting up the motor by compression of the spring by a disc 28, the latter being moved by a pivoted lever 27 which is pressed towards the clutch when a roller 26 moves out of a recess 25 in a disc 24 driven by chain gearing from the shaft 8. Weighted magnetic brakes 5, 6 are provided in connection with the motor shaft and the shaft 8 respectively, the brake-drum 6 carrying stops 43, 44, adapted to operate a terminal switch 18, Fig. 1. Switches 1 are arranged on the supporting pillars 45 and the movement of the levers 20 is also adapted to make a contact which switches on the motor. In operation, when a door 17 is to be opened, the appropriate rack 13 is locked to the rail 12 and the lever 20 is turned to allow the door to drop, this action starting up the motor which turns the shaft 8 to engage the clutch 10 and thus the crank 9 is turned to move the rail 12 and carry the door beyond the vertical position. When the crank 9 has attained its maximum throw the stop 44 operates the switch 18 to cut off the motor and apply the brakes 5, 6. To close the door 17, the current is switched on at 1, the rail 12 being drawn back to restore the door to its closed position in which it is secured by turning the lever 20. A device for braking the fall of the door comprises either a liquid brake or, as shown in Fig. 1, spring- pressed rollers 51 engaging with the tapered end 53 of the rail 12. To enable work to be continued in the event of a failure of current, the motor shaft is connected by bevel-gearing 37, 38 to a shaft 32 which can be operated by chain tackle 50.