Ventilation – Vehicle – Railcar – bus – or trailer
Patent
1992-02-07
1993-11-23
Joyce, Harold
Ventilation
Vehicle
Railcar, bus, or trailer
454194, B61D 2700
Patent
active
052638944
ABSTRACT:
A ventilation control device for a high-speed train carriage is operable in conjunction with a ventilating blower. A deflectable spring flap is mounted to extend across the ventilation duct in the air flow path. When deflection of the flap reaches a threshold level corresponding to possible passenger discomfort, the flap operates a limit switch positioned behind it. This activates a driving solenoid to close a shutter which shuts off the flow through the duct. A timer holds the shutter closed for a predetermined period, after which it is re-opened. Use of a microprocessor-controlled continuous sensor and damper can thereby be avoided, while cutting out very large pressure fluctuations.
REFERENCES:
patent: 3363540 (1968-01-01), Mason
patent: 3459114 (1969-08-01), Baclini
patent: 3561346 (1971-02-01), Stephenson et al.
patent: 5137490 (1992-08-01), Ishikawa et al.
Higaki Hiroshi
Hirakawa Haruo
Ikio Atsushi
Ishikawa Shinichiroo
Matsumoto Masakazu
Hitachi , Ltd.
Joyce Harold
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