Patent GB-704372-A (GB)
Title: Improvements in latching means for the doors of coke ovens and the like
IPC: F27D1/18
Filed: 1951-11-14
Abstract: 704,372. Coke-oven doors. KOPPERS GES., H. Nov. 14, 1951 [Nov. 14, 1950; Dec. 19, 1950], No. 26679/51. Class 55 (1) In a latching means, for a coke-oven or like door, having spring means which apply the sealing-pressure of the door against its frame, the spring means are compressed by fluid pressure means, when it is desired to remove the door, so as to remove the pressure of the pivoted latch bar from the hooks. In Fig. 2, spring washers 13 are housed in a frame 11 bolted to the door back 9 and are compressible by a plunger 30 bearing upon a disc 14. The plunger 30 is reciprocable in a cylinder formed in an extension 22 of the frame 11 on which the latch bar 20 is pivoted. The pressure of the springs 13 is transmitted to the latch bar by the heads 19 of screws 18 which are adjustably screwed into lugs 16 on the disc 14. The hydraulic or pneumatic pressure is supplied by a line connected to the annular passage 34 between the bore 21 and a cylinder lining 29 which is correctly positioned by lugs 33 and a shoulder 31. The passage 34 is connected to the cylinder by ports 37 and the lining 29 is kept against packing 32 by a screwed plug 27. A head 26 of the plug 27 forms an abutment for a spring 25 which, when the plunger 30 compresses the springs 13, moves the latch bar away from its hooks and permits it to be swung out of engagement therewith. In Fig. 5, the springs 13 bear upon a ring 47, the underside of which is acted upon by an inflatable ring 65, packing 68 being provided to prevent the ring 65 from being nipped. The ring 47 is threaded on the latch screw 50 which is shouldered at 58 to bear against the latch 20. A set screw 60 secures the latch 20 to the screw 50 so that, when the spring pressure on the latch has been relieved by the fluid pressure, swinging of the latch away from the hooks screws the spindle 50 into the ring 47, which is prevented from. turning by the lug and recess 71, 72, and moves the latch away from the hooks. If the springs 13, or the fluid pressure means, fail, the set screw 60 is slackened and the latch screw 50 actuated manually by the squared end 55. The construction shown in Fig. 5 may be modified by arranging the ring 65 remote from the latch bar, it being housed under a circular flange of a member having a shank which is screwed into a sleeve, the latch screw 50 also being screwed into the sleeve. The springs are arranged between the latch bar and ring 65. If the fluid pressure means fail, the screw 50 is screwed further into the sleeve until the spring pressure is taken by a rim on the circular flange meeting an abutment surface. Similarly, if the springs become inoperative, the latch may be worked by turning the screw. In Fig. 7, the springs 13 act upon a nut member 87 having a squared portion 55 for manual operation, the latch 20 being pivoted on the nut. The latch screw 50 is guided by a pin 82 projecting from the door back 9 into a recess 80. A squared flange 83 on the screw 50 engages a corresponding recess in a plate 46 between which and a rigid abutment plate 11 is interposed an inflatable body 65 formed in two U- sectioned parts which are clamped in fluid-tight manner to the plates 46, 11 by rings 85 which act also as limit-stops.