Electrical device and smoke detector

• US 20090241697A1
• Filed: 03/16/2009
• Published: 10/01/2009
• Est. Priority Date: 03/31/2008
• Status: Active Grant

• Current Assignee: Nohmi Bosai Limited (Secom Company Limited)
• Original Assignee: Nohmi Bosai Limited (Secom Company Limited)
• Inventors: Kato, Kenichi, Yokota, Hiroyuki
• Granted Patent: US 8,225,656 B2
• Time in Patent Office: Days
• US Class Current: 73/863.810
• CPC Class Codes: G08B 17/10 Actuation by presence of smoke or gases , e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
• CPC Class Codes: G08B 17/113 Constructional details
• CPC Class Codes: H05K 5/0221 Locks; Latches

Abstract

Provided is an electric device which is free from causing troubles in opening/closing the cover even if the housing is distorted. The electric device includes: a case (3) having a substantially box shape and an opened end surface (3a); a cover (5) including a lid surface (5a) for covering the end surface of the case (3), a hinge (4) arranged between the case (3) and the cover (5), for opening/closing the case (3) and the cover (5); and an engagement section (12) for holding a closed state of the case (3) and the cover (5), in which the engagement section (12) includes: an engaged portion (7) arranged in the case (3) and includes a shaft member (9) having a shaft portion substantially orthogonal to an inner surface (3b) of the case (3), and a bearing member (11) for fixing the shaft member (9) with a distal end (9a) thereof projecting from a guide hole end surface (10a) of a shaft member pushing portion (10); and an engaging portion (19) including a coupling component (20) provided with an attachment piece (23) to be attached to the cover (5), and a substantially horseshoe shaped portion (27) for communicating a cutout (25) of substantially long hole shape in connection to an end of the attachment piece (23).

Claims

1. An electric device, comprising:

a case having a substantially box shape and an opened end surface;

a cover including a lid surface for covering the end surface of the case;

a hinge arranged between the case and the cover, for opening/closing the case and the cover; and

an engagement section for holding a closed state of the case and the cover,

wherein the engagement section includes;

an engaged portion arranged in the case and includes

a shaft member having a shaft portion substantially orthogonal to an inner surface of the case, and

a bearing member for fixing the shaft member with a distal end thereof projecting from a guide hole end surface of a shaft member pushing portion; and

an engaging portion including

a coupling component provided with an attachment piece to be attached to the cover, and

a substantially horseshoe shaped portion for communicating a cutout of substantially long hole shape in connection to an end of the attachment piece.

2. An electric device according to claim 1, wherein:

an inner surface on a front end side of the substantially horseshoe shaped portion and the guide hole end surface, and an outer surface on a back end side of the substantially horseshoe shaped portion and the inner surface of the case are respectively combined when a lid is closed; and

the engaged portion is caused to pass through the cutout so that fitting therebetween is performed.

3. A smoke detector, comprising a substantially box-shaped housing which includes:

a fan for taking in sampling air from a sampling tube; and

a smoke detection unit for introducing the sampling air from the sampling tube,

wherein an accommodation chamber in which the fan and the smoke detection unit are arranged in proximity to each other at different levels one above the other is arranged in the housing.

4. A smoke detector according to claim 3, wherein the accommodation chamber is sealed by a lid body.

5. A smoke detector, comprising a substantially box-shaped housing which includes:

a fan for taking in sampling air from a sampling tube; and

a smoke detection unit for introducing the sampling air from the sampling tube, wherein;

an accommodation chamber for accommodating one of the fan and the smoke detection unit is arranged in the housing; and

a side wall of the accommodation chamber lined with a circuit board accommodating section of the housing at a predetermined gap therefrom has a dual structure.

6. A smoke detector according to claim 5, wherein the side wall of the housing has a dual structure.