Patent GB-680886-A (GB)
Title: Coke oven door machine
IPC: C10B25/14
Filed: 1951-03-29
Abstract: 680,886. Coke ovens. ALLIED CHEMICAL & DYE CORPORATION. March 29, 1951 (July 11, 1950], No. 7326/51. Class 55 (i) A coke oven door 18, 19 is removed from the end of a coking-chamber 16 by a machine having wrenches for turning the jack-screws 24 to release the pressure of the latch bars 23 on the hooks 30 on the door frame 17, means 123 for rotating the latch bars away from the hooks, and means 105 for engaging under hook plates 33 on the door and raising the door slightly preparatory to withdrawing it from the chamber 16, all of the operations being effected in the required sequence by a single power unit. The door is replaced by a reversal of the sequence. The power unit is a hydraulic piston and cylinder 91, 92 which, with the mechanism operated thereby, is mounted in a housing 38.pivoted at 40 in a U-shaped yoke 39 which is supported from a ram 41 by a turnbuckle 46 and pivots 42. The ram 41 is movable horizontally towards or away from the chamber 16 by means on the support 43. The machine is placed against the door, and pressure is admitted to the top of the piston 91 which is connected to a crosshead 95 carrying a pinion 86 meshed between two parallel rack bars 77. The bars 77 thus descend integrally with the piston, and, being meshed with upper and lower pinions 70 effect rotation of the wrench sockets 52 through gear trains 61, 64. When the racks 77 have reached the ends of their travels, flats on the pinions 70 engage flats on the rack bars 77. Sufficient backlash is provided in the gear transmission to enable the squared socket 52 to accommodate itself to the squared end of the jack-screw. The latch bars 23 are, by rotation of the socket 52, relieved from pressure against the hooks 30 so that they may be swung away from the hooks by the members 123 which are carried on a vertically movable bar 124. The bar 124 is carried on upper and lower links 125 and is actuated by a bell crank 117 having a roller 120 against which bears a cam 103 on the crosshead 95. The descent of the crosshead thus forces up the bar 124, and, by the linkage 110, 114, swings up the means 105 to engage beneath the hook-plates 33 and thereby lift the door slightly. The door is now ready for withdrawal by retraction of the ram 41. The wrenches each comprise a socket 52 squared to fit over the end of the jack-screw 24 and having a flatted outer surface to engage a similarly flatted recess in a sleeve 53. The outer surface of the socket 52 is curved, in ball-joint manner, to permit the socket to move out of axial alignment with the sleeve 53 and its driving shaft 54, to accommodate mis-positioning of the jack-screw 24 and the lifting of the door by the means 105. Similarly the sleeve 53 is driven by the flatted member 57, on the shaft 54, which is curved to permit the sleeve to go out of alignment. A spring 60 is positioned behind the socket 52, and is compressed as the socket is forced on to the jack-screw 24. When the rack bars 77 are moved upwardly to tighten the jack-screws, if one screw jams before the other, the latter continues to be turned by a differential action between the racks and the pinion 86. The lower portion of the housing 38 is resiliently positioned by a turnbuckle 135 pivoted at one end 136 to the ram 41 and at the other end 134 to a bell crank 132 pivoted at 133 to the housing 38 and loaded by a spring 139. The turnbuckle is adjusted to project the lower part of the machine towards the door, further than the upper part, so that the spring 139 is compressed as the machine is forced against the door and becomes parallel therewith. Moreover, when the door is removed, the upper part of the door will separate from the frame before the lower part.