Title:
COMPOSITE ALARM FOR LEAKED FIRE GAS
Document Type and Number:
Japanese Patent JP3638226
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To secure prescribed sound pressure even if there is a space between a main body unit and cover sound holes.
SOLUTION: The composite alarm for leakage fire gas is equipped with the main body unit 1 which is freely attached to and detached from a fitting part such as a ceiling surface, a smoke detection unit 2 which is mounted in the center of the lower part of the main body unit 1, and a cover 3 which is mounted covering the lower outside while the smoke detection unit 2 is mounted on the main body unit 1. A loudspeaker is mounted in a loudspeaker opening part 9 on the lower surface of the main body unit 1 and semicylinders 12 and 11 are provided inside the smoke detection unit 2 and cover 3 facing the loudspeaker opening part 9 and the semicylinders form a cylindrical sound duct 10 extending from the loudspeaker opening part to the cover sound holes 6 in a state where the semicylinders are assembled.
Inventors:
Toshiyuki Ozawa
Tomizawa Toshikazu
Kenichi Osaki
Tomizawa Toshikazu
Kenichi Osaki
Application Number:
JP14937799A
Publication Date:
April 13, 2005
Filing Date:
May 28, 1999
Export Citation:
Assignee:
Hochiki Corporation
Tokyo Gas Co., Ltd.
Yazaki Corporation
Tokyo Gas Co., Ltd.
Yazaki Corporation
International Classes:
G08B17/10; G08B19/00; (IPC1-7): G08B19/00; G08B17/10
Domestic Patent References:
| JP3030001U | ||||
| JP57073793U | ||||
| JP8167083A | ||||
| JP6081088U |
Attorney, Agent or Firm:
Susumu Takeuchi
Saichiro Miyauchi
Saichiro Miyauchi
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