Rabble arm used in multiple hearth furnace

Details Rabble arm used in multiple hearth furnace Rabble arm used in multiple hearth furnace

1987-12-21

1989-06-27

Scott, Samuel

Heat exchange

Movable heating or cooling surface

Hollow strirrer or scraper

52731, F28F 500

Patent

active

048420514

ABSTRACT:
A rabble arm adapted to be connected to a rotatable center shaft of a multiple hearth furnace includes an elongated tubular member having an open end portion and an opposite closed end portion. The tubular member has an outside surface of substantially oval cross-sectional configuration and an inside surface arranged to form a hollow interior portion connected with the tubular member open end portion. The oval cross-sectional configuration of the tubular member outside surface defines a tubular member major axis and a tubular member minor axis displaced from the major axis by substantially 90.degree. C. A socket is connected to the tubular member open end portion. The socket and tubular member may include partitions or tubes which are connected upon assembly to form a flow path through the socket and tubular member for receiving a circulating cooling medium. The socket with the tubular member connected thereto forms a rabble arm which is adapted to be secured to a vertically extending center shaft of a multiple hearth furnace so that the tubular member is cantilevered to the center shaft with the tubular member minor axis positioned substantially horizontally.

REFERENCES:
patent: Re12254 (1904-08-01), Wright
patent: 431203 (1890-07-01), Dithridge
patent: 1079405 (1913-11-01), Fowler
patent: 1687935 (1928-10-01), Fowler
patent: 2925893 (1960-02-01), Baas
patent: 4007574 (1977-02-01), Riddell
patent: 4211179 (1980-07-01), Saunders

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