Patent GB-688714-A (GB)
Title: Improvements in or relating to coke oven doors
IPC: C10B25/12
Filed: 1951-03-30
Abstract: 688,714. Coke-oven doors. GILLOTT, J. M. Aug. 3, 1951 [Aug. 28, 1950 ; March 30, 1951]. Nos. 21182/50 and 7371/51. Class 55 (i). A self-sealing coke-oven door is applied to, and withdrawn from, its frame by substantially horizontal movements, the locking being effected by means which jam between the door and abutments on the frame, the said means being connected by compensating gear whereby the sealing thrusts of the jamming means are equalized, the compensating gear serving also to resolve the downward thrust of the weight of the door into horizontal sealing thrusts. In Fig. 1, the door 1 is applied to a frame 2, the weight of the door being taken by bars 13 which engage abutments 9 on the frame. The bars 13 are cranked and are each pivoted on a pin 16, Fig. 5, which is parallel to the door face and is carried in a crosshead 17 slidable vertically in guides 19 on the door. A downward thrust on each crosshead 17 is resolved, by the toggle action of the bar 13 against the abutments 9, into a horizontal sealing thrust, the downward thrusts being applied by the compensating gear, firstly by rotation of the wheel 32 thereof, which controls the screw-adjustment 30 and ensures equal jamming actions of the bars 13 against the abutments 9, and secondly by the downward thrust of the weight of the door transmitted through the pivot 34 of the compensating gear to the connecting rods 29, 35. When the door is applied to the frame, it is supported by the hook of the door-handling machine engaging under the bar 42 and by a heel engaging the side ribs 23 of the door. The adjustment means 30, 32, having previously been operated during the door-removal operation, to raise the cross-heads 17 to such an extent that lugs 38 on the bars 13 contact with the tops of slots 37 on a plate 21 fixed to the door, so that the bars 13 are swung towards the door away from the abutments 9 and are moved bodily upwards to clear the tops of the abutments, are operated, when the door is presented to the frame, to move the cross-heads 17 downwardly so that the lugs 38 leave the tops of the slots 37 and the bars 13 are placed within and jammed against the abutments. The door is, when in use, spaced from the bottom of the oven opening so that, when the door-handling machine is withdrawn, the weight of the door is transferred by the pivot 34 to the bars 13. The screw means 30 may be replaced by hydraulic means, and the pivot 34 may be on a vertically movable slide operable by hydraulic or screw threads. In a modification, the screw adjustment means is secured to the door and is connected by links and levers to the bars 13 which are lifted and lowered as required. The swinging of the bars, which is effected by the lugs 38 in the previous construction, is effected positively by members on the door-handling machine, which engage under the bars. In Fig. 8, the rod 35 of compensating gear as shown in Fig. 1 is pivoted to a stirrup 70 pivoted at 71 to a pair of levers 72 carrying a bar 73 which engages the abutments 74. An arm 75 is carried by the bar 73 so that when the stirrup 70 is moved downwardly, the arm 75 bears on a strip 76 and applies a horizontal sealing thrust to the door. When the stirrup is lifted, the arm 75 leaves the strip 76 and the lug 78 contacts with the top of the slot 79 to swing the levers upwardly to remove the bar 73 from the abutments. A cam on the bar 73 may replace the arm 75. In another modification, the jamming is effected by a wedge-like member having a transverse square bar which engages sloping faces of the abutments, the horizontal thrust of the wedge action being transmitted to the door by a roller bed over which the said member moves vertically. The members are connected by compensating gear as in Fig. 1. The sloping faces of the abutment may be engaged by rollers on the wedge member. In Fig. 15, latch bars 110, 114 are swingable on axles 116 to be engageable with, or 'disengageable from, pairs of reversely directed hooks 113 B . The axles 116 are screwed into sockets 111 on the door and are revoluble by arms 117 secured thereto, the arms being pivoted to limbs 124, 118 connected by a rocking lever 122 A  which is itself pivoted at 122 B  to levers 125, carrying a crossbar 125 B  and pivoted in a bracket 125 A  on the door. When the door is presented to the frame, the latch bars 110, 114 are swung manually to come within the hooks 113 B , but with slight clearance therefrom. The adjustment means 119, 121 is then operated, by shortening the link 118, to bring the crossbar 125 B  down on to horizontal abutments 127 on the door frame. The swinging of the arms 117 screws the axles 116 outwardly whereby the latch bars 110, 114 are forced against the hooks 113 B  to provide the initial sealing thrusts. When the door-handling machine is removed, the weight of the door is supported by the crossbar 125 B  on the abutments 127, and is transmitted through the links 118, 124 to the arms 117 to augment the sealing thrusts. The linkage system may be modified to operate four swinging latch bars.