Electric resistance heating devices – Heating devices – Combined with nonelectric heating means
Reexamination Certificate
2005-10-25
2005-10-25
Jeffery, John A. (Department: 3742)
Electric resistance heating devices
Heating devices
Combined with nonelectric heating means
C392S365000
Reexamination Certificate
active
06959144
ABSTRACT:
Providing a hot air heater and an expansion in the air blowing passage of the hot air heater and suppressing increases in air trunk resistance even if electric heaters are arranged in this expansion in a plurality of stages prevents increases in the rotation speed of the air blowing fan in order to obtain a target air flow which in turn causes the operating noise to grow louder. Therefore, an expansion35was formed along the air blowing passage32.This expansion35has an entrance opening351and an exit opening352and functions as a storage portion that contains the electric heaters34.The electric heaters are arranged in a plurality of stages in such a manner as to face said entrance opening and a distance between the entrance opening in the expansion and one of the electric heaters that has a highest wind speed at the entrance opening in the expansion of distances between the entrance opening in the expansion and the respective electric heaters is set farther.
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Fujisawa Yoshinori
Ito Keiichi
Shimonoma Yukihiko
Yamada Yoshimune
Arent & Fox PLLC
Jeffery John A.
Rinnai Corporation
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