JP2004206280A - Detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detector capable of increasing the strength of a cover locking piece to be engaged with a base locking piece and strengthening the connection structure of a base main body and a cover main body. <P>SOLUTION: The detector 1 is composed of the base main body 2 fixed to an attaching surface and the cover main body 3 freely attachably and detachably connected to the base main body 2 by a turning operation. The base main body 2 houses an electrical wire 6 and a peripheral edge wall 4 is erected along an outer peripheral edge. The cover main body 3 houses a detection means and a recessed groove 16 to which the peripheral edge wall 4 is to enter is formed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a detector such as a fire alarm, and more particularly, to a connection structure between a base body and a cover body.
[0002]
[Prior art]
Some detectors for detecting the occurrence of a fire or the presence of a person use a battery as a driving power source. As a first conventional example, a configuration as shown in a sectional view of FIG. There is a detector 51 (for example, see Patent Document 1). The detector 51 is, for example, a fire alarm, and includes a mounting base 53 fixed to a mounting surface 52 such as a ceiling surface of a building by screws, and a cover 54 detachably connected to the mounting base 53. It has.
[0003]
The attachment base 53 provided in the detector 51 accommodates an electronic circuit component 55 and a battery 56 as detection means, and the cover 54 closes an opening of the attachment base 53 as the cover 54 is connected. ing. In this case, the electronic circuit component 55 is, for example, for detecting a fire and outputting a detection signal, and the battery 56, which is the drive power source for the electronic circuit component 55, is replaced with a new one as the battery is exhausted. You.
[0004]
[Patent Document 1]
JP-A-9-293181
[Problems to be solved by the invention]
In the detector 51 described above, an electronic circuit component 55 and a battery 56 are housed in a mounting base 53. Therefore, when fixing the attachment base 53 to the mounting surface 52, a work which is difficult in terms of weight is required. On the other hand, when the battery 56 is replaced, particularly when the mounting surface 52 is a ceiling surface, the replacement work is performed at a high place, and it is assumed that the battery 56 may be dropped. Difficult work is required.
[0006]
In order to avoid this kind of inconvenience, a detector 61 configured to show a disassembled state in the perspective view of FIG. 7 has been proposed as a second conventional example. That is, the detector 61 includes a base plate 62 fixed to a mounting surface (not shown) such as a ceiling surface of a building, and a cover body 63 detachably connected to the base plate 62. Reference numeral 64 in the drawing denotes mounting screws, and the base plate 62 is fixed to the mounting surface by these mounting screws 64.
[0007]
At this time, the cover body 63 incorporates an electronic circuit component (not shown) as a detecting means, and as shown in the perspective view of FIG. A battery housing recess 65 for housing (not shown) is formed. A cover locking piece 66 is formed in the base plate 62, while a base locking hole 67 is formed in the cover body 63.
[0008]
Accordingly, as only the main structure is shown in the cross-sectional view of FIG. 9, as the cover locking piece 66 and the base locking hole 67 engage with each other by the rotation operation of the cover main body 63, the cover main body 63 is It is detachably connected to the base plate 62. When the cover body 63 is connected to the base plate 62 fixed to the mounting surface 52, the opening surface of the battery storage recess 65 storing the battery is closed by the base plate 62.
[0009]
The base plate 62 of the detector 61 is merely fixed to the mounting surface 52, and heavy electronic circuit components and batteries are stored in a cover body 63 detachably connected to the base plate 62. Have been. Therefore, with the configuration of the detector 61, it is not necessary to perform a heavy weight operation when fixing the base plate 62 from which the cover main body 63 has been removed to the mounting surface 52.
[0010]
When replacing the battery, after removing the cover main body 63 from the base plate 62 fixed to the mounting surface 52, the replacement of the battery in the battery storage recess 65 of the cover main body 63 is performed at the operator's hand position. Becomes possible. Therefore, even if the mounting surface 52 of the detector 61 is a ceiling surface, replacement work at a high place is unnecessary, and the battery cannot fall from a high place.
[0011]
However, in this detector 61, despite the fact that the weight of the cover main body 63 is increased due to the storage of the electronic circuit components and the batteries, the cover is formed only by the engagement between the cover locking pieces 66 and the base locking holes 67. The main body 63 is supported by the base plate 62. That is, in the detector 61, the entire cover body 63 is supported only by the cover locking pieces 66 formed at predetermined positions along the circumferential direction of the base plate 62.
[0012]
In such a structure, since it is difficult to keep the cover main body 63 by the base plate 62 in terms of strength, the entire base plate 62 is made of a metal material having sufficient strength, or the cover locking piece 66 It is considered that it is made of a metal material alone. However, if the entire base plate 62 is made of metal, the protection of the battery stored in the battery storage recess 65 of the cover main body 63 is hindered. Also, even when only the cover locking piece 66 is made of metal, In reality, it is difficult to cooperate with the cover body 63.
[0013]
The present invention has been made in view of such inconvenience, and it is possible to increase the strength of a cover locking piece that engages with a base locking piece, and a connection structure between a base body and a cover body. The purpose of the present invention is to provide a detector capable of enhancing the detection.
[0014]
[Means for Solving the Problems]
The detector according to the first aspect of the present invention comprises a base body fixed to a mounting surface, and a cover body detachably connected to the base body by a rotation operation, wherein the base body is The cover body houses a detecting means and has a concave groove into which the peripheral wall enters. It is characterized by the following.
[0015]
A detector according to a second aspect of the present invention is the detector according to the first aspect, wherein a cover engaging piece is formed at a predetermined position along a circumferential direction of the peripheral wall, and an inner position of the concave groove is provided. Is characterized in that a base locking piece engaging with the cover locking piece is formed.
[0016]
A detector according to a third aspect of the present invention is the detector according to the first or second aspect, wherein a lead-in hole for the electric wire is formed at a predetermined position along a circumferential direction of the base body, and The bottom surface of the drawing hole has a curved surface shape that allows the electric wire to rise.
[0017]
A detector according to a fourth aspect of the present invention is the detector according to any one of the first to third aspects, wherein the peripheral wall has a cut-off portion serving as a lead-in hole for the electric wire at a position corresponding to the lead-in hole. The detachable portion is formed so as to be removable.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is an exploded perspective view showing an entire structure of a detector according to the present embodiment, FIG. 2 is an explanatory view showing a front side structure of a base body provided in the detector, and FIG. 3 is a base body and a cover body. It is sectional drawing which shows the principal part structure of. FIG. 4 is a perspective view showing a back side structure of a cover main body provided in the detector, and FIG. 5 is an explanatory view showing a state in which a cover locking piece and a base locking hole are engaged. 1 to 5, reference numeral 1 denotes a detector, 2 denotes a base body, and 3 denotes a cover body.
[0019]
The detector 1 according to the present embodiment is, for example, a fire alarm, and as shown in FIG. 1, a base body 2 attached to and fixed to a mounting surface (not shown) such as a ceiling surface or a wall surface of a building. And a cover main body 3 detachably connected to the base main body 2 by a rotation operation. The base body 2 is a substantially cylindrical bottomed cylindrical container made of an insulating synthetic resin or the like, and a peripheral wall 4 having a predetermined thickness is erected at a predetermined height along the outer peripheral edge of the bottom surface. ing.
[0020]
The base body 2 is fixed with mounting screws (not shown) inserted through the through holes 5 in the bottom surface in a state where the back surface of the bottom surface is in contact with the mounting surface. As shown in FIG. 2, a wiring space 7 is provided for accommodating an electric wire 6 such as a signal line for communication with an external device such as an alarm buzzer. At a predetermined position along the circumferential direction of the base body 2, a lead-in hole 8 of the electric wire 6 is formed, and a connection-side end of the electric wire 6 drawn into the wiring space 7 from outside through the lead-in hole 8. Is connected to a screw terminal 9 for fixing.
[0021]
At this time, as shown in FIG. 3A, the bottom surface of the drawing hole 8 has a curved surface shape that allows the electric wire 6 to rise. When the bottom surface of the drawing hole 8 has a curved surface shape, the electric wire 6 drawn through the drawing hole 8 can be easily raised on the wiring space 7 as shown in FIG. Further, connection terminals 10 having a so-called crocodile structure are provided at positions along the peripheral edge wall 4 on the bottom surface of the base body 2, and these connection terminals 10 are electrically connected to the screw terminals 9 separately.
[0022]
Further, at a position corresponding to the drawing hole 8 of the peripheral wall 4, a detachable portion 11 which is also a drawing hole of the electric wire 6 is formed so as to be removable, and the detector 1 is fixed to the wall surface of the building. In some cases, the detachable portion 11 is removed and the electric wire 6 is drawn. In consideration of the case where the detector 1 is fixed to the wall surface of the building, in the present embodiment, the pair of drawing holes 8 and the separable portions 11 are substantially equally spaced in the circumferential direction on the bottom portion of the base body 2. , Specifically, for each symmetric position.
[0023]
Furthermore, a cover locking piece 12 is formed at a predetermined position along the circumferential direction of the peripheral wall 4, that is, at a position symmetrically corresponding to the drawing hole 8, and each of the cover locking pieces 12 is formed. Are opposite to each other and protrude inward from the bottom surface. That is, since the cover locking pieces 12 extend from the distal end of the peripheral wall 4 and are integrated with the peripheral wall 4 having a predetermined thickness, the cover locking pieces 12 have a greater strength than the cover locking pieces 66 in the conventional form. It has become.
[0024]
On the other hand, the cover body 3 provided in the detector 1 is a substantially circular hollow container made of an insulating synthetic resin or the like, and has a slightly larger diameter than the base body 2. Various electronic circuit components (not shown) serving as detecting means are built in the cover body 3. As shown in FIG. 4, the cover body 3 is replaceable on the back surface of the cover body 3 facing the base body 2. A battery housing recess 15 for housing a power supply battery 14, that is, a battery housing recess 15 having a substantially rectangular shape in plan view and a predetermined depth is formed.
[0025]
The cover main body 3 is formed with a concave groove 16 into which the peripheral wall 4 having a predetermined thickness and standing upright along the outer peripheral edge of the base main body 2 is formed. A base locking piece 17 is formed to engage with the cover locking piece 12 formed on the peripheral wall 4 of FIG. At this time, the recessed portions 18 of the cover locking pieces 12 are formed at predetermined positions along the circumferential direction of the cover body 3, that is, at positions that are symmetrical to each other. A base locking piece 17 is formed to engage with the cover locking piece 12 that has entered each of the recesses 18 with the turning operation of the cover body 3.
[0026]
Further, on the back surface of the cover body 3, there are provided connection contacts 19 which are electrically connected to each other while being held between the connection terminals 11 of the base body 2, and these connection contacts 19 are provided by an electronic circuit as a detecting means. Conducted with parts. In the figure, reference numeral 20 denotes a drawstring, and reference numeral 21 denotes an alarm sound stop button. The alarm sound stop button 21 is used at the time of operation confirmation and at the time of alarm stop.
[0027]
That is, in the detector according to the present embodiment, when connecting the cover main body 3 to the base main body 2 fixed to a mounting surface such as a ceiling surface or a wall surface of a building, as shown in FIG. The peripheral wall 4 of the base body 2 is housed in the groove 16 of the cover body 3 while the cover engaging piece 12 of the base body 2 enters the recess 18 of the cover body 3. Thereafter, when the cover main body 3 is rotated, as shown in FIG. 5B, the cover locking piece 12 of the base main body 2 moves and engages with the base locking piece 17 of the cover main body 3, resulting in the cover. The main body 3 is connected to the base main body 2.
[0028]
At this time, the connection contact 19 is sandwiched between the connection terminals 11 to conduct, and the opening surface of the battery housing recess 15 housing the battery 14 is closed by the base body 2. Therefore, it is unlikely that the battery 14 will fall out of the battery housing recess 15 of the cover body 3 connected to the base body 2.
[0029]
By the way, the detector 1 according to the present embodiment is not limited to a fire alarm, and may detect a person or the like. Further, the detector 1 here may be a smoke detecting type including a light projecting element, a light projecting lens, a light receiving element, an optical bench having a built-in labyrinth, or a heat detecting type using a semiconductor, or It is needless to say that a configuration that detects gas odor may be used.
[0030]
【The invention's effect】
The base body of the detector according to the first aspect of the present invention has a peripheral wall erected along an outer peripheral edge thereof, and a peripheral wall is detachably connected to the base body by a rotation operation. Is formed therein. As a result, the base body and the cover body are securely aligned, and the force applied from the cover body to the base body is dispersed, so that the connection structure between the base body and the cover body can be strengthened. Can be
[0031]
In the detector according to the second aspect of the present invention, the cover locking piece is integrally formed at a predetermined position along the circumferential direction of the peripheral wall of the base body, and the base locking piece engages with the cover locking piece. Are integrally formed at positions inside the concave grooves of the cover body. Therefore, the strength of the cover locking piece and the base locking piece is increased, and the entire cover main body can be continuously supported by the cover locking piece of the base main body.
[0032]
In the detector according to the third aspect of the present invention, since the bottom surface of the lead-in hole of the electric wire formed in the base main body has a curved surface shape, the electric wire drawn through this lead-in hole is placed on the wiring space. The advantage that it is easy to start up is secured.
[0033]
In the detector according to the fourth aspect of the present invention, the detachable portion serving as the electric wire drawing hole is formed at a position corresponding to the drawing hole of the peripheral wall so as to be removable, so that the detector is fixed to the wall surface of the building. In such a case, it is easy to draw in the electric wire by removing the detachable portion. In addition, as long as the detector is fixed to the ceiling surface of the building, it is not necessary to remove the detachable portion, so that the strength of the peripheral wall formed on the base body can be maintained. Benefits are ensured.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing the entire structure of a detector according to the present embodiment.
FIG. 2 is an explanatory diagram showing a surface side structure of a base body provided in the detector according to the present embodiment.
FIG. 3 is a cross-sectional view illustrating a main structure of a base main body and a cover main body included in the detector according to the present embodiment.
FIG. 4 is a perspective view showing a back side structure of a cover main body provided in the detector according to the present embodiment.
FIG. 5 is an explanatory view showing a state in which a cover locking piece and a base locking hole are engaged in the detector according to the present embodiment.
FIG. 6 is a sectional view showing an attached state of a detector according to a first conventional example.
FIG. 7 is a perspective view showing an exploded state of a detector according to a second conventional example.
FIG. 8 is a perspective view showing a rear-side structure of a cover body provided in a detector according to a second conventional example.
FIG. 9 is a cross-sectional view showing a main structure of a base plate and a cover body provided in a detector according to a second conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Detector 2 Base main body 3 Cover main body 4 Peripheral wall 6 Electric wire 8 Electric wire draw-in hole 11 Separable part 12 Cover locking piece 16 Depression groove 17 Base locking piece

Claims (4)

A detector comprising a base body fixed to the mounting surface and a cover body detachably connected to the base body by a rotation operation,
The base body houses an electric wire, and a peripheral wall is erected along an outer peripheral edge, and the cover body houses a detecting means, and has a concave groove into which the peripheral wall enters. Detector. A cover locking piece is formed at a predetermined position along the circumferential direction of the peripheral wall, and a base locking piece that engages with the cover locking piece is formed at a position inside the concave groove. The detector according to claim 1, characterized in that: A lead hole for the electric wire is formed at a predetermined position along the circumferential direction of the base body, and a bottom surface of the lead hole has a curved surface shape that allows the electric wire to rise. The detector according to claim 1 or 2, wherein The detachable part which becomes the drawing hole of the said electric wire is formed in the position corresponding to the said drawing hole of the said peripheral wall so that removal is possible, The Claim 1 characterized by the above-mentioned. Detector.

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