Patent GB-298093-A (GB)
Title: Improvements in or relating to extractor gear for gas retorts
IPC: C10B33/02
Filed: 1927-03-28
Abstract: 298,093. Gas, Light, & Coke Co., and Holdway, S. March 28, 1927. Discharging. - Apparatus for effecting the reciprocation of rods adapted to drive worm dischargers for gas retorts, comprises a main reciprocatable rod secured to the member to be reciprocated and reversed by an auxiliary reciprocatable rod formed in two aligned parts, one of which is intermittently and directly reciprocated by the main rod while the other part is positively moved to effect reversal of the main rod by gravity-actuated trip mechanism operatively connecting the adjacent ends of the two parts of the auxiliary rod. Fig. 1 shows a water, compressed air, or steam actuated arrangement comprising a cylinder 1 enclosing a piston 2, the rod 3 of which is connected at 4 to the rod 44<1> driving the coke-extractors. The rod 3 carries an arm 5 having a boss 38 adapted to contact with one of a pair of stops 36, 37, adjustable on a rod 33, the latter being formed with a forked end 34 having slots 35 to receive a pin 31 slidable between two stops 32 on a second rod 30 aligned with the rod 33. The rod 30 is connected directly to a valve 17 adapted to control the supply of fluid from pipe 26 to a second valve 9 which, in turn, controls the flow of fluid to the ends of the main cylinder 1 through pipes 27, 28. The rod 30 is positively actuated by a weighted lever 39 pivoted on the cylinder 1 and forked to straddle the pin 31, the weight 40 being raised towards the end of each stroke of the rod 33 and then facing, by gravity, to actuate the rod 30 and so reverse the positions of the valves 17, 9. The weight 40 is connected by a pivoted link 44 to the cock 29 controlling the escape of fluid from the cylinder 1, this cock being adjustable to vary the speed and length of the stroke and also to provide, if desired, a quick return movement of the piston 2. As shown in Fig. 3, the cock comprises a hollow plug 46 formed with rectangular and conical apertures 47, 48, respectively, and carrying, at one end, a stem 49 for ccnnection to the link 44 and, at the other end, a pin 50 formed with a screwthread 51 co-operating with a similar thread cut in the casing 45. Secured on the end of the pin 50 is a wheel 53 having notches in which may be engaged a spring 54 the plug 46 being thus adjusted to and held in that position, longitudinally of the bore 45, which gives the desired rate of escape of the spent fluid. Fig. 6 shows a construction in which the main rod 60, connected to the rod 44<1>, is screw-threaded so as to be reciprocated by the rotation of a nut 61 connected through a sleeve 57 and coupling- flanges 58, 59, to the shaft of a reversible electric motor 56. In this case the auxiliary rod is formed in two aligned parts 70, 72, the adjacent forked ends of which are slotted at 74, 75 for engagement by a pin 76 on a lever 77 which is pivoted at 79 and carries a weight 78. The rod 70 is reciprocated by the main rod 60, through the co-operation of arm 5 and stops 68, 69, to raise the weight 78 which, falling under gravity, effects reciprocation of the rod 72 to throw over the reversing-switch 82. In a modification of this arrangement, the nut 61 is driven through reduction gearing from the motor 56, while in a further construction the latter drives, through reduction gearing, a pinion which meshes with a rack formed on the main rod 60.