Patent GB-483792-A (GB)
Title: Improvement in coke oven door machinery
IPC: C10B25/14
Filed: 1937-07-30
Abstract: 483,792. Coke-oven doors. WILPUTTE, A. J. July 30, 1937, No. 21129. Convention date.Aug.l3, 1936. [Class 55 (i)] In a machine for removing and replacing the doors of horizontal coke ovens, comprising a member which is moved upwards to engage the door and is then moved further upwards to lift the door, means are provided for stopping the upward movement after the door has been lifted a predetermined distance irrespective of the distance through which the member has to be moved before it engages the door. In the form shown, the door-engaging member 0 is vertically movable on rollers in a track N<4> on a member N pivoted at M<8> to a carriage M mounted on wheels M<1> on transverse rails on the main frame of the machine (not shown), which runs on rails parallel to the face of the oven ; the carriage M is moved towards and away from the oven by means (not shown) comprising a geared motor and crank acting through a link which contains a cushioning spring, and moves over dead-centre when the member N is pressed against the door frame at N<2>. The member N is tilted by a spring N<3> so that in the replacing operation the lower part of the door I, engaged by a spring plunger S, is inserted first in its seating. The door is secured closed by two latch bars L engaging hooks (not shown) on the frame and each pressed against the hooks (to press the door against its seating) by a spring L<7> acting on a lever L<4> which is pivoted to the door and has a short tail pivotally connected to a part L<3> of the latch bar L. The door-removing operation is performed by a geared electric motor Q carried on the member N and connected through a crank P to a vertically-moving member P<1> guided by a link N<1>, and provided with two rollers P<2>, P<3> ; this member is connected by a link <p4> to an arm <p5> which carries a roller engaging the lever L<4> of the lower latch L in the same way as P<2> engages that of the upper latch. In the initial position the door-engaging member 0, which is supported by a spring 0<1>, is held down clear of the door by the roller P<2> ; the first movement of the mechanism, bringing the roller P<2> into engagement with the lever L<4>, frees the member 0 for upward movement into engagement with the hook 1<2> of the door, as shown. Further movement causes the lever L<4> to draw the latch bar L slightly back from the hooks on the frame to relieve the pressure on the door, and the roller P<3> then engages the member 0 to raise it and lift the door. The movement of the mechanism is stopped by a limit switch carried on the member 0 and operated by an arm R<5> engaging a hook member R<2> carried on the member N ; this member R<2> is positioned by lever and link connection with an arm R which is pivoted on the member N and has a roller engaging a cam I<1> on the door so that the door is always raised to the same height above its initial position before the limit switch operates, irrespective of the initial relation between the door and the machine. In a modification, the motor Q operates the member 0 directly, and the latchreleasing levers L<4> are operated by a lever pivoted on the member 0 and engaging the door hook I<2>. Specifications 471,775, [Group XVIII], and 471,849 are referred to.