The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 1993
Filed:
Feb. 07, 1992
Haruo Hirakawa, Kudamatsu, JP;
Shinichiroo Ishikawa, Tokuyama, JP;
Hiroshi Higaki, Kudamatsu, JP;
Atsushi Ikio, Tokuyama, JP;
Masakazu Matsumoto, Kudamatsu, JP;
Hitachi, Ltd., Tokyo, JP;
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.