under the action of scrapers or pushers (F27B9/26 takes precedence)

Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity > characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment > the charge moving in a substantially straight path > under the action of scrapers or pushers

Furnaces through which the charge is moved mechanically, e.g. of tunnel type (rotary-drum furnaces with means for agitating or moving the charge F27B7/14); Similar furnaces in which the charge moves by gravity > characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment (for treating continuous lengths of work F27B9/28) > the charge moving in a substantially straight path > under the action of scrapers or pushers (F27B9/26 takes precedence)