ApplicationNo. 561433 filed on 03/24/1975
US Classes:65/350, Plural spaced reheaters432/145, Distinct blowers or blower discharge ports along path432/149, Combustion material supply ports spaced along path432/150, Spaced combustion products exhaust ports65/351Plural spaced cooling means
ExaminersPrimary: Kellogg, Arthur D.
Attorney, Agent or Firm
AbstractThis disclosure relates to glass annealing lehrs in which glass ware is supported on an endless conveyor to convey it through a closed tunnel consisting of separately controllable temperature zones which expose the ware to a glass annealing temperature gradient produced and maintained by gaseous fuel burners and electrical heaters employed separately or jointly, depending upon the availability of the fuel or electrical energy. In accordance with the invention, circulating fans are positioned at both sides of each lehr section, and air inlet ducts are provided for admitting controlled amounts of ambient air to the inlet of each fan.