Patent GB-784005-A (GB)
Title: Improvements in door-handling means for horizontal chamber coking ovens
IPC: C10B41/06
Filed: 1955-06-20
Abstract: 784,005. Door-handling apparatus for coke-ovens. KOPPERS GES., H. June 20, 1955 [Oct. 30, 1954], No. 17794/55. Addition to 699,399. Class 55 (1). In a door-handling apparatus for horizontal coke ovens comprising unlatching means, a thrust motor and a retracting motor, all operable by pneumatic or hydraulic pressure under the control of a change-over device to enable the unlatched door to be lifted, withdrawn and moved or pivoted aside from an oven as in the parent Specification, the change-over device comprises a housing into which are connected conduits leading to the thrust and retracting motors and to the unlatching means, and a supply conduit leading to a pressure fluid source and through which this fluid is adapted to be passed into the housing for supply to the motors and unlatching means, the housing also having valve means for controlling the supply of pressure fluid to, and its exhaust from, the housing, and a cam shaft for operating the valve means. As.shown, in Fig. 1, the change-over device comprises a housing 1 in which are located in bores 2, valves 3-8 and a cam shaft 9 mounted in a horizontal bore 10, one end 11 of the shaft 9 passing through the wall of the housing 1 while the other end is sumpported by a screw 13. Valves 3, 4 and 5 only are operated by the cam shaft; valve 3 controls the admission of pressure fluid to the device, from a port 15, valve 4 controls the exhaustion of the pressure fluid through a port 16 and valve 5 controls the supply of the pressure fluid to the retracting device through a port 17. Valves 3 and 4 are operated by a cam 18 and valve 5 is operated by a cam 19. All the valves are interconnected by the conduit 10 and valves 6, 7 and 8 are continuously open, pressure fluid being supplied through them and ports 61, when admitted to the housing through the opening of valve 3, simultaneously to the thrust motor and the unlatching devices, and exhausted through them when valve 3 is closed and valve 4 is opened. Valves 3, 4 and 5 each comprise a valve member 20 carried by a valve stem 21 and urged by a spring 25 against a valve seat 26 located in a bore 27 communicating with the duct 10 when the valve -is held open by the corresponding cam 18 or 19. The cams 18 or 19 engage with rollers 28 mounted in holders 29 on pins 30 projecting from the valve members 20 and urged by helical springs 31 against the associated cam 18 or 19. Valves 6, 7 and 8 comprise a valve member 20 carried by a valve body 32 screwed into a housing 24 and arranged on a valve stem 21 so that the opening of the valves can be regulated and can be shut off by hand. The stems 21 of all the valves have hand-grips 34 surrounded by yokes 36 to prevent accidental operation of the valves. The hand-grips 34 of valves 6, 7 and 8 are bolted to the yokes 36 while the handgrips of the valves 3, 4 and 5 are free to move. The change-over device is operated by a tubular control lever 38. A ratchet wheel 36<SP>1</SP> (Fig. 2) is secured on the end 11 of the cam shaft 9 and is surrounded by a boss 37 loosely mounted thereon and secured to the tubular control lever 38. A sliding pawl 39 is located in the lever 38 acted on by a spring 40. The ratchet wheel 36<SP>1</SP> has four teeth and when the pawl 39 engages a tooth, movement of the lever 38 moves the cam shaft 9 in the direction of the arrow 45, this producing a rotation of one step. A locking member 47 has a projection 49 engaging in a recess in a collar 48 and as the collar 48 is secured to the boss 37 the locking member must be lifted before the lever 38 and then the cam shaft can be moved. After the locking member 47 has been disengaged the lever 38 is moved back in the direction of the arrow 46 to a position indicated by line 60 and then rocked to the position indicated by line 50. Movement of the lever 38 is limited by projections 51 and 53 abutting against a stop 52 carried by the housing 1 of the change-over device. In operation the valve 3 is first opened and the exhaust valve 4 closed by moving the lever 38 into the position indicated by line 50 thereby admitting pressure fluid, e.g. compressed air, to the housing 1 and simultaneously to the thrust motor and the unlatching devices through valve 6 and valves 7 and 8 respectively, thus releasing the latches and raising and withdrawing the door. To replace the door the lever 38 is moved first to the position indicated by line 60 and then to the position indicated by line 50 thereby opening valve 5 and admitting pressure fluid to the retracting motor whereby the door is gradually lowered into position. Pressure fluid from the thrust motor and the unlatching means is exhausted through valve 4 and finally pressure fluid from the retracting motor is exhausted through a small opening 57 and a passage 58 in the stem 21 of the valve 5.