Tilt and swing lock mechanism for electric furnace

F - Mech Eng,Light,Heat,Weapons – 27 – B

Patent

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307/18

F27B 14/02 (2006.01) F27D 3/18 (2006.01) F27D 11/08 (2006.01)

Patent

CA 1067126

TILT AND SWING LOCK MECHANISM FOR ELECTRIC FURNACE ABSTRACT OF THE DISCLOSURE A mechanical tamper-resistant interconnecting lock- ing apparatus is connected to a top charge tiltable direct arc electric furnace which includes a refractory lined fur- nace shell and a removable roof covering a top opening in the shell. The mechanical locking apparatus of the invention prevents tilting of the furnace during potentially unsafe conditions, i.e., when the removable roof is positioned other than over the shell top opening. The locking apparatus may not, without considerable difficulty, be dismantled, collapsed, or bypassed to allow possible unsafe operation of the furnace. The apparatus includes a first locking mechanism which, when engaged, prevents the tilting of the furnace, and a second locking mechanism which, when engaged, prevents the swinging of the roof from over the shell top opening. A mechanical linkage interconnects the two mechanisms and prevents simultaneous disengagement of both of them. Also; once one of the mechanisms is disengaged and adjacent por- tions of the furnace are moved relative to each other, the entire locking apparatus is prevented from further movement until the adjacent portions are returned to the position pro- viding lock mechanism engageability.

249746

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