the present invention will be described referring to fig2 and 4 in which a plurality of the discharging devices are arranged outwardly surrounding the furnace bottom 4 as shown in fig2 showing the main portion of the discharging device the radially inner end of the raking arm 9 extends over the circumferential portion of the furnace bottom while the radially outer end of the arm 9 is fixed by a shaft 10 which is rotatably supported through a bearing 13 by a frame member 12 which is in turn removably attached to the outer shell 11 of the furnace 1 the mechanical space formed between the shaft 10 and the frame member 12 is sealed with a seal member 14 the lower end of the shaft 10 is connected to a driving mechanism not shown such as a piston cylinder through a connection bar 15 thus when the driving mechanism is actuated the shaft 10 rotates to swing the raking arm 9 horizontally if the arm 9 is designed to turn 360 u00b0 a large space is required and therefore a larger frame member is required in order to eliminate these requirements efficiently it is desirable to swing the arm 9 within a certain angle range for example within a range of 30 u00b0 it is not desirable that the base portion and the shaft 10 are affected by the heat from the furnace atmosphere and the furnace product therefore it is desirable that a jacket 16 is formed in the frame member 12 supporting the.