Patent GB-471849-A (GB)
Title: Improvement in coke oven door machinery
IPC: C10B25/14
Filed: 1936-06-20
Abstract: 471,849. Door - operating apparatus. WILPUTTE, L. N. June 20, 1936, Nos. 10132/37 and 10133/37. Convention dates, June 25, 1935 and June 11, 1936. Divided out of 471,775, [Group XVIII]. [Class 65 (i)] [Also in Group XII] Coke-oven door machinery is adapted first to relieve the spring pressure which tends to press the door and its locking bar apart, and then to lift the door. The main frame member R is adapted to be moved bodily towards the door, and laterally for engagement with different doors, and is mounted on a carriage RA running on rails r. The member R is suspended by links R<1> from the carriage RA, and is moved to and from the door by a motor with reduction gear RB. The motor rocks a shaft R<2> through linkwork R<3>-R<7> which includes cushion springs R<9>. The member R carries door-engaging levers S, s which act similarly at the upper and lower ends of the door, the levers S, s being carried by short links T<1>, t<1> pivoted to the member R at T, t. Springs T<4>, T<5> connect the lever T<3> to the member R. Rotation of the rocking shaft T is limited by a stop T', but the lower shaft t is not so provided. The lever S is provided with a hook S<3> which passes under the door part I<3>. A cam U is pivoted on a shaft S<1> on the lever S and carries a roller U<1> which engages the lever Q. Angular movement of the cam is limited by recesses U3, U<4> which engage a bar S<2>. Another part U<5> of the cam engages a part M<1> of the door-locking bar M to tilt it into unlocking position. The cam is pivoted at U<6> to a link W<2> connected to a pivoted arm W<1> journalled in the member R. The rock shaft W is oscillated by a rod W<5> connected to a motor X which is controlled when energized to give a half-turn to the shaft X<2>. The lower lever s is connected to the upper S by links Ss, and the cams U, u are similarly connected by a link Uu. Movement of the member R into door-engaging position causes roller U<1> to engage lever Q, and through lever S causes clockwise rotation of the lever T<1> till the abutment T<7> is engaged, and the springs R<9> slightly compressed. The motor X is then caused to move the rock-shaft W counterclockwise, which moves lever S ultimately into the position shown in Fig. 7, carrying the cam U with it. The upward movement of the pivot U<6> causes clockwise rotation of the cam U, after the movement of the lever S is arrested by the part P, until it reaches the position shown in Fig. 7, and further upward movement then lifts the door. The latter part of the movement of the roller U<1> downward along the lever Q moves the latter to compress the spring PO and relieve the pressure on the latch bar M so that the latter is free to turn when engaged by the part U<5> of the cam U. The door is thus unlocked and free for removal by the time the door-lifting operation of the lever S occurs. Removal of the door is effected by the motor RB which rotates the shaft R<2> counterclockwise, this acting through links R<12>, R<13> and R<1> upon the member R. The whole carriage RA may then be moved laterally along the track r. The engagement of the pivot T<2> with the abutment T' ensures that as the weight of the door is taken by the lever S, a slight outward movement simultaneously occurs. The apparatus allows for relative horizontal displacement of the parts I<3>, i<3> due to distortion of the door. When the door is replaced, the bottom engages its seating before the top. In a modification, Figs. 9 and 11 (not shown), the locking bars have no movement relatively to the door in a vertical direction, but are lifted with the door in order to disengage them from hooks carried by the door frame. The door machine carries a horizontally pivoted beam which engages the door frame at top and bottom to position the door-engaging mechanism. In another modification, Fig. 13 (not shown), only one lifting hook is provided. Specification 471,775, [Group XVIII], is referred to.