Hitachi, Ltd.

Mituo Suzuki

Shigeru Matsuoka

Seiji Yonekura

Takeshi Tokunaga

Kenji Nakamura

Toshio Tsubaki

Takuya Sasaki

Tamotsu Yamane

Yoshun Horibe

A garage door operation control apparatus includes a door operating system for opening and closing the main door of a garage, a main detection circuit for detecting the open or closed condition of the main door, an auxiliary detection circuit for detecting an open condition of a window or an auxiliary door of the garage, a fire in the garage or generation of a special gas therein, an alarm and a signal processing circuit. Electrical signals from the detection circuit are logically analyzed thereby to control the door operating system and the alarm.

Garage door operation control apparatus

A door operation control apparatus comprising a memory circuit for storing a programmed data on door control processes in the form of a combination of command codes is disclosed. A door operation input signal, a mode or condition detection signal from a door operating device and the condition of the program being executed are used to determine logically the optimum door operating mode, thus controlling the door operating device.

Door operation control apparatus

The feedwater heater of this invention comprises a plurality of heating tubes arranged in U form, with feedwater being passed therethrough, a feedwater inlet chamber having a feedwater inlet for introducing feedwater thereinto and a tube plate assembling the ends of said heating tubes and also having formed therein a feedwater reservoir, a feedwater outlet chamber having a feedwater outlet for discharging the heated feedwater and a tube plate assembling the other ends of said heating tubes and also having formed therein a feedwater reservoir, a first cylindrical body or shell having disposed therein a tube nest consisting of the U-formed heating tube portions positioned on one side as well as support plates holding said heating tubes in position, said cylindrical body having its one end communicated with said feedwater outlet chamber and also provided with a hot steam inlet for introducing hot steam that serves as the feedwater heating source, a second cylndrical body or shell having disposed therein a tube nest consisting of the U-formed heating tube portions positioned on the other side as well as support plates holding said heating tubes in position, said second cylindrical body having its one end communicated with said feedwater inlet chamber and provided with a condensate outlet for discharging the steam condensate out of the system, and a spherical container formed from two hemispherical shells communicated with said both cylindrical bodies and having therein a space housing the bent portions of said U-formed heating tubes.

Feedwater heater

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Hitachi, Japan

Mituo Suzuki