Patent GB-512511-A (GB)
Title: Improvements in coke oven door mechanism
IPC: C10B25/12
Filed: 1937-12-16
Abstract: 512,511. Coke oven door fastenings. KOPPERS CO. Dec. 16, 1937, No. 34861. Convention date, Dec. 23, 1936. [Class 55 (i)] In a coke-oven having a door 16 secured by latch bars 20 on the door, the ends of the bars engaging under hooked keepers 19, and the door being pressed on its seating 15 under spring pressure, the pressure is applied and controlled through a device which releases the pressure by expansion of the spring and which is only operative for a limited number of rotations, after which rotation is idle, so that the fastening and tightening means may be power-operated without risk of damage to door or seating. Fig. 3 shows a pin 27 screwed into a bracket 25 mounted on the door, and secured in the bracket by set-screw 28. The pin is surrounded by a sleeve 32 the inner end of which carries a plate 34 with square aperture embracing a square portion 33 of the pin whereby the sleeve is non- rotatable but slidable, its outward movement being limited by a collar 29 on the pin. Sleeve 32 has a limited internal thread 36 normally engaged by a limited thread on the inner end of a member 43, the outer end of which is square and engages a corresponding aperture in a plate 40'integral with a crank arm 45. Plate 40 is bolted to a short sleeve 39 rotatably mounted on sleeve 32 and retained thereon by a collar 37 screwed and keyed on the sleeve 32 and is held against axial movement thereon between two sets of spacing washers 48. Adjustment of bar 20 along the sleeve may be effected by removing washers from one side and replacing them at the other. The washers are of horseshoe form so that they can be removed and replaced laterally and are held against rotation by a projection on each washer engaging a groove in the sleeve. A compression spring 31 surrounding pin 27 bears at one end against the collar 29 and at the other against a movable washer 30, outward movement of which is limited by a fixed washer 46. Washer 30 normally bears against the end of member 43 and spring pressure is transmitted through threads 36 to sleeve 32 and bar 20. Rotation of member 43 in one direction compresses spring 31, with consequent increase of pressure on bar 20. If rotation is continued until the threaded portion of member 43 clears threads 36, no further endlong movement of member 43 occurs, member 43 rotating idly so that overcompression of the spring cannot occur. Rotation in the opposite direction allows expansion of the spring with release of pressure on bar 20, and if this rotation continues till the threads are again cleared, a second compression spring 42 keeps the end thread of member 43 idly bearing against end thread 36 ready to re-engage when rotation is reversed. Member 43 is rotated by hand or power applied to crank 45. As shown; a power-operated arm 49 is provided with a roller engaging crank 45 and has a conical end co-operating with a bevel 51 on the crank to lead arm 49 into lateral engagement when brought up endwise. A modification is described in which spring 42 is omitted and re-engagement of threads is effected by hand, this modification being described as designed for use with a switch or other device for limiting rotation by automatically cutting off power. In this modification pin 27 has a duct for introduction of lubricant.