JP2018163540A - Attachment base, and alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: an attachment base for securely attaching an alarm device in which a part of a cover projects, onto an installation surface; and the alarm device securely attached onto the installation surface.SOLUTION: There is provided an attachment base 1 that is provided between an installation surface on which an alarm device 100 is placed and a case 2 of the alarm device 100, for attaching the case 2 onto the installation surface. The case 2 and the attachment base 1 are mutually rotated and fixed in reference to a rotating shaft Po1. The case 2 that projects toward the attachment base 1 side comprises a projection part 211 shifted from the rotating shaft Po1. The attachment base 1 that avoids mutual interference between itself and the projection part 211 comprises an avoidance opening 11 disposed at a position facing the projection part 211, when mutually rotating at least the case 2 and the attachment base 1 in reference to the rotating shaft Po1.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a mounting base and an alarm device.

  Conventionally, there has been known an alarm device that is installed on a ceiling surface of a monitoring area and detects and smokes smoke in the monitoring area by its own smoke detector (see, for example, Patent Document 1). This alarm device is attached to the ceiling surface of the monitoring area using an attachment base provided between the cover of the alarm device and the ceiling surface.

Japanese Patent Application Laid-Open No. 2006-128989

  By the way, in recent years, from the viewpoint of improving the design of the alarm device, there is a demand for thinning of the alarm device. Therefore, it is necessary to project the alarm cover toward the mounting base in a shape corresponding to the smoke detector. However, when the cover of the alarm device is protruded, the protruding portion of the cover and the mounting base interfere with each other, and there is a possibility that the alarm device cannot be attached to the ceiling surface of the monitoring area.

  The present invention has been made in view of the above problems, and an object thereof is to provide a mounting base that can securely attach an alarm device with a part of a cover protruding to an installation surface, and an alarm device that can be reliably attached to the installation surface. And

  In order to solve the above-described problems and achieve the object, the mounting base according to claim 1 is a mounting base provided between an installation surface on which an alarm device is installed and a cover of the alarm device, The attachment base for attaching the cover to the installation surface, and the cover and the attachment base are fixed by rotating relative to each other with respect to a rotation axis. A projecting portion projecting toward the projecting portion, and the projecting portion deviating from the rotation axis, and the mounting base is an avoiding means for avoiding interference between the projecting portion and itself. And at least the avoidance means provided at a position facing the protrusion when the cover and the mounting base are rotated relative to each other with respect to the rotation axis.

  The mounting base according to claim 2 is the mounting base according to claim 1, wherein the avoiding means rotates the cover and the mounting base relative to each other with respect to the rotation shaft. It is a shape corresponding to the locus | trajectory in which the said protrusion part moves with respect to a cover.

  According to a third aspect of the present invention, in the mounting base according to the first or second aspect, the protruding portion has a circular shape, and the avoiding means has a distorted circular shape.

  The mounting base according to claim 4 is the mounting base according to any one of claims 1 to 3, wherein the cover has a detection space which is a space for detecting a detection target of the alarm device. The protrusion of the cover protrudes corresponding to the shape of the detection space, and the avoidance means is an opening.

  The alarm device according to claim 5 is an alarm device installed on an installation surface, and is a cover, an installation base provided between the installation surface and the cover, and And the mounting base for mounting the cover, the cover and the mounting base are fixed by rotating relative to each other with respect to a rotation axis, and the cover protrudes toward the mounting base. The protrusion is offset from the pivot axis, and the mounting base is an avoiding means for avoiding interference between the protrusion and the self, and at least And the avoiding means provided at a position facing the protruding portion when the cover and the mounting base are rotated relative to each other with respect to the rotating shaft, and the protruding portion of the cover includes: Take the nameplate to the self Mounting mark serving as a reference for kicking, and a.

  According to the mounting base of the first aspect, by providing the avoiding means for avoiding interference, for example, it is possible to avoid interference between the cover of the alarm device and the mounting base. The alarm device with a part protruding can be securely attached to the installation surface.

  According to the mounting base of the second aspect, since the avoiding means has a shape corresponding to the trajectory along which the protruding portion moves, for example, the avoiding means can be prevented from becoming unnecessarily large. The strength of the mounting base can be ensured.

  According to the mounting base of the third aspect, since the avoiding means has a distorted circular shape, for example, since the avoiding means has no corners, the catch between the cover of the alarm device and the mounting base is prevented. The alarm device can be smoothly installed on the installation surface.

  According to the mounting base of the fourth aspect, since the avoiding means is the opening, for example, the material of the portion corresponding to the opening in the mounting base can be omitted. Can be installed smoothly and a lightweight mounting base can be provided at low cost. In addition, for example, since the protrusion of the cover can be put in the opening of the mounting base, when the alarm device is provided using the mounting base on the installation surface, the thickness of the mounting base and the entire alarm device is reduced. A smart impression can be given, and an alarm device can be installed without impairing the beauty of the installation location.

  According to the alarm device of the fifth aspect, by providing the avoiding means for avoiding interference, for example, interference between the cover of the alarm device and the mounting base can be avoided. The alarm device with a part protruding can be securely attached to the installation surface. In addition, by providing the attachment mark, for example, it is possible to indicate to the worker a reference for attaching the nameplate to the alarm device, so that the work efficiency of the nameplate attachment operation of the alarm device can be improved.

It is a perspective view of the alarm device which concerns on this Embodiment. It is a bottom view of an alarm device. It is a side view of an alarm device. It is AA arrow sectional drawing of FIG. It is a disassembled perspective view of the alarm device seen from the lower side. It is a disassembled perspective view of the alarm device seen from the upper side. It is a bottom view of a mounting base. It is a top view of an attachment base. It is a bottom view of a back case. It is a top view of a back case. It is a bottom view of the attachment base provided in the attachment base detachable position. It is a bottom view of the attachment base provided in the fixed position for attachment bases. It is a bottom view of the back case and attachment base provided in the detachable position for back cases. It is a bottom view of the back case and attachment base provided in the fixed position for back cases.

  Embodiments of a mounting base according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

[Basic concept of the embodiment]
First, the basic concept of the embodiment will be described. Embodiments generally relate to a mounting base provided between an installation surface on which an alarm device is installed and a cover of the alarm device.

  Here, the “alarm device” is a device that performs an alarm, and specifically, a device that performs an alarm about a substance to be detected contained in the gas in the monitoring region. For example, a gas alarm, And a fire alarm (smoke alarm). The “monitoring area” is an area to be monitored, specifically, an area where an alarm device is installed. For example, an area in a house (for example, a room) or an area in a building other than a house It is a concept including Further, the “installation surface” is a surface of an installation object on which the alarm device is installed. For example, the surface on the monitoring area side of the ceiling (that is, the lower surface of the ceiling), the surface on the monitoring area side of the wall (that is, the surface) , Interior side walls). Further, the “installation object” is an object on which the alarm device is installed, and examples thereof include a ceiling and a wall in the monitoring area. In addition, the “substance to be detected” is a detection target of the alarm device, specifically, a substance contained in a gas, and is a concept including, for example, carbon monoxide and smoke in the gas.

  The “mounting base” is a mounting means for mounting the cover of the alarm device on the installation surface, specifically, provided between the installation surface and the cover of the alarm device, for example, This is a concept that includes a part that is configured as a part of an alarm device or a part that is not configured as an element of the alarm device and that is configured independently of the alarm device.

  In the following embodiment, the “subject to be detected” is “smoke”, and the “alarm device” is a “fire alarm (smoke alarm)” that warns based on scattered light from smoke, A case where the “monitoring area” is “a room as an area in a house” and the “mounting base” is “configured as a part of an alarm device element” will be described. As described above, the “installation target” includes “ceiling” or “wall”, and the case where the “installation target” is “ceiling” is illustrated below. The case where “thing” is “wall” will be described as appropriate.

(Constitution)
First, the configuration of the alarm device according to the present embodiment will be described. FIG. 1 is a perspective view of an alarm device according to the present embodiment, FIG. 2 is a bottom view of the alarm device, FIG. 3 is a side view of the alarm device, and FIG. FIG. 5 is a cross-sectional view taken along arrow A, FIG. 5 is an exploded perspective view of the alarm device viewed from the lower side, and FIG. 6 is an exploded perspective view of the alarm device viewed from the upper side. In the following description, XYZ shown in each figure is a direction orthogonal to each other. Specifically, the Z direction is the vertical direction (that is, the direction in which gravity works), and the X direction and Y Assuming that the direction is a horizontal direction orthogonal to the vertical direction, for example, the Z direction is referred to as a height direction, the + Z direction is referred to as an upper side (plane), and the −Z direction is referred to as a lower side (bottom surface). To do. Further, the following terms relating to the “XYZ directions” are convenient expressions for explaining the relative positional relationship (or direction) of each component in the alarm device 100 shown in the figure. With reference to the center position of the detection space 34 of the case 2 in FIG. 4, the direction away from the detection space 34 is referred to as “outside”, and the direction approaching the detection space 34 is referred to as “inside”.

  The alarm device 100 shown in each of these figures is an alarm means for detecting and alarming smoke (detection target) that is a substance to be detected contained in gas. Specifically, as shown in FIG. Installation surface 900 that is the lower surface (ie, the lower surface) (ie, the lower surface) of the ceiling of the region, or the unillustrated installation that is the surface of the monitoring region on the monitoring region side (ie, the indoor side surface of the wall) It is used by being attached to a surface (hereinafter referred to as a wall installation surface), and specifically includes an attachment base 1, a case 2, a detection unit cover 3, a detection unit main body 4, and a circuit unit 5 in FIG. 5. In the following, the installation surface 900 spreads in the direction along the XY plane (that is, the horizontal direction), and the “wall installation surface” (not shown) is orthogonal to the installation surface 900 (that is, the vertical direction). The case where it spreads to will be described. Below, after explaining the structure of the alarm device 100 whole, the detail of especially characteristic structure is demonstrated.

(Configuration-Mounting base)
First, FIG. 7 is a bottom view of the mounting base, and FIG. 8 is a plan view of the mounting base. The attachment base 1 shown in FIG. 3 is an attachment means for attaching the case 2 to the installation surface 900 or a “wall installation surface” (not shown). Specifically, the case 2 and the installation surface 900 or not shown. For example, it is made of a disk-shaped resin having a slightly smaller diameter than the case 2 as a whole. The details of the mounting base 1 will be described later.

(Configuration-Case)
Next, the case 2 in FIG. 3 is a cover that covers the detection unit cover 3, the detection unit main body 4, and the circuit unit 5 (hereinafter referred to as an object to be accommodated) in FIG. It is a storage means for storing the object to be stored, and is specifically attached to the installation surface 900 via the mounting base 1, for example, a disk-shaped resin as a whole. 4, the back case 21, the front case 22, and the inflow / outflow opening 23 are provided.

(Configuration-Case-Back Case)
FIG. 9 is a bottom view of the back case, and FIG. 10 is a plan view of the back case. As shown in FIG. 5, the rear case 21 in each of these figures is a first cover that covers the “accommodation object” from the mounting base 1 side (that is, the upper side (+ Z direction)), and accommodates the accommodation object. The first housing means, specifically, is coupled to the front case 22. Details of the back case 21 will be described later.

(Configuration-Case-Front Case)
As shown in FIG. 5, the front case 22 is a second cover that covers the “accommodation object” from the side opposite to the mounting base 1 side (that is, the lower side (−Z direction)). The second storage means for storing the battery, specifically, is coupled with the back case 21.

(Configuration-Case-Inlet / outlet opening)
The inflow / outflow opening 23 is an inflow / outflow means for allowing smoke to flow into or out of the detection space 34. Specifically, the inflow / outlet opening 23 is provided over the entire side surface of the case 2. For example, the gap is provided between the back case 21 and the front case 22.

(Configuration-detector cover)
Next, the detection unit cover 3 in FIG. 5 is for detecting smoke using scattered light, and specifically, a partition member that partitions the detection space 34 that is a space for detecting smoke in FIG. 4. And, it is provided on the upper side (+ Z direction) of the detection unit main body 4. As shown in FIG. 5, the detection unit cover 3 is made of a cylindrical resin whose one opening is closed, and more specifically, the ceiling plate 31, the labyrinth 32, and the insect net shown in FIG. 4. 33. The ceiling plate 31 covers the detection space 34, specifically, is formed in a disk shape having a smaller diameter than the case 2, and the labyrinth 32 is integrally formed on the lower surface (−Z direction). Is formed. The labyrinth 32 is a partition wall that partitions the detection space 34, and specifically, prevents disturbance light from entering the detection space 34. The insect repellent net 33 is an insect repellent means for preventing outside air from entering the detection space 34 while allowing outside air to enter the detection space 34 through the small holes of the insect repellent net 33, and surrounds the outer periphery of the labyrinth 32. The side surface has a large number of small holes that are difficult for insects to enter.

(Configuration-detection unit body)
Next, as shown in FIG. 4, the detection unit body 4 is an arrangement unit that arranges the detection unit cover 3, and is a partition unit that partitions the detection space 34 together with the detection unit cover 3. A gas flow path is formed between the back case 21 after shielding the gas flowing into the case 2 from the inflow / outflow opening 23 from entering between the detection unit main body 4 and the front case 22. It is. For example, the detection unit main body 4 extends from the detection unit cover 3 side in FIG. 4 to the inflow / outflow opening 23 side in the direction along the XY plane, and as shown in FIG. 6, the ceiling plate 31 of the detection unit cover 3. The diameter is slightly smaller than the front case 22 and is made of a resin having a disk shape with a part cut away. The detection unit main body 4 includes an element cover 41, for example.

  The element cover 41 covers a light emitting unit 52 and a light receiving unit 53 (to be described later) in the circuit unit 5 from the upper side (+ Z direction) to prevent dust from accumulating on the light emitting unit 52 and the light receiving unit 53. 4 includes an optical path hole for forming an optical path between a light emitting unit 52 and a light receiving unit 53 described later in the circuit unit 5 and the detection space 34 of FIG. 4.

(Configuration-Circuit part)
Next, as shown in FIG. 6, the circuit unit 5 is a circuit unit that forms an electric circuit for performing an alarm. More specifically, the circuit unit 5 includes a circuit board 51, a light emitting unit 52, and a light receiving unit 53. The circuit board 51 is a mounting means on which each element of the alarm device 100 is mounted. Specifically, the circuit board 51 is mounted on the upper (+ Z direction) mounting surface (hereinafter referred to as the upper mounting surface) or the lower (−Z direction). A through hole and a terminal surrounding the through hole are provided at predetermined positions so that each element is mounted on a surface (hereinafter referred to as a lower mounting surface) using solder or the like. The light emitting unit 52 is a light emitting unit that emits light. Specifically, as illustrated in FIG. 4, the circuit board is configured to emit light toward the detection space 34 provided above (the + Z direction) the light emitting unit 52. 51 is an element mounted on the upper mounting surface of 51, for example, a light emitting diode. The light receiving unit 53 is a light receiving unit that receives scattered light generated by the light emitted from the light emitting unit 52 being scattered by smoke particles. Specifically, the light receiving unit 53 is above the light receiving unit 53 (+ Z direction). An element mounted on the upper mounting surface of the circuit board 51 so as to receive light from the provided detection space 34, for example, a photodiode.

(Configuration-details)
Next, details of the mounting base 1 and the back case 21 will be described.

(Configuration-details-mounting base)
The mounting base 1 in FIG. 7 includes, for example, an avoidance opening 11, a screwing hole 12, a base-side engagement portion 13, a lightening portion 14 in FIG. 8, and a base-side rotation mark 15.

(Configuration-details-mounting base-avoidance opening)
The avoidance opening 11 is an avoidance means for avoiding interference between the attachment base 1 and a later-described protrusion 211 of the back case 21 of FIG. 6, and at least the case 2 and the attachment based on the rotation axis Po1. When the base 1 is rotated relative to each other, it is an avoiding means provided at a position facing the protruding portion 211. For example, when the case 2 and the mounting base 1 are rotated relative to each other with respect to the rotational axis Po1. The shape corresponds to the trajectory along which the protruding portion 211 moves with respect to the case 2, and an example is a distorted circular through-opening. The “rotating shaft” Po1 is a virtual shaft that serves as a reference for rotating the mounting base 1 and the back case 21 so that they can be fixed to each other or detachable. 1 and an axis corresponding to the center of the back case 21.

(Configuration-Details-Mounting base-Screw holes)
The screw hole 12 is an installation surface fixing means (or simply fixing means) for fixing the mounting base 1 to the installation surface 900 of FIG. 3. For example, the base fixing screw Sk1 to be screwed into the installation surface 900 is used. This is a hole for rotating the mounting base 1 so as to be detachably fixed, and engages and fixes the fixing screw Sk1 for the base.

  FIG. 11 is a bottom view of the mounting base provided at the mounting base attachable / detachable position, and FIG. 12 is a bottom view of the mounting base provided at the mounting base fixing position. The “mounting position for the mounting base” is a relative position between the base fixing screw Sk1 screwed to the installation surface 900 and the mounting base 1, and specifically, the mounting base 1 is fixed to the base. This position is detachable in the height direction (Z direction) with respect to the screw Sk1 (that is, the installation surface 900). The “mounting base fixing position” is a relative position between the base fixing screw Sk1 screwed to the installation surface 900 and the mounting base 1, and specifically, the mounting base 1 is the base fixing screw. It is a position that is not detachable in the height direction (Z direction) with respect to Sk1 (that is, the installation surface 900) and is a fixed position.

  Although the specific structure of the screw hole 12 is arbitrary, for example, when the attachment base 1 is rotated in the A1 direction with respect to the rotation axis Po1, the attachment base 1 is provided at the attachment base fixing position. When the mounting base 1 is rotated in the direction A2 with respect to the rotation axis Po1, the mounting base 1 is provided at the mounting base detachable position. The base mounting screw Sk1 of the installation surface 900 is detachable.

(Configuration-Details-Mounting base-Base side engaging part)
7 is a case fixing means for fixing the attachment base 1 and the case 2 to each other. For example, the base side engagement portion 13 is attached to a back case side engagement portion 212 described later of the back case 21. An engagement piece that is detachably fixed by rotating the base 1 relatively (that is, rotating the back case 21), and is engaged with and fixed to the back case side engagement portion 212. It is.

  FIG. 13 is a bottom view of the back case and the mounting base provided at the detachable position for the back case, and FIG. 14 is a bottom view of the back case and the mounting base provided at the fixing position for the back case. . The “removable position for the back case” is a relative position between the mounting base 1 and the back case 21, and specifically, a detachable position where the back case 21 and the mounting base 1 can be attached to and detached from each other. In this position, the back case 21 can be attached to and detached from the mounting base 1 in the height direction (Z direction). Further, the “back case fixing position” is a relative position between the mounting base 1 and the back case 21, specifically, a fixing position where the back case 21 and the mounting base 1 are fixed to each other. The case 21 is a position where the case 21 is not detachable with respect to the mounting base 1 in the height direction (Z direction) and is a fixed position.

  Although the specific structure of the base side engaging part 13 is arbitrary, for example, it is comprised so that the direction of rotation may be reverse to attachment / detachment and fixing to the installation surface 900 of the mounting base 1. When the back case 21 is rotated in the A2 direction with the rotation axis Po1 as a reference, the back case 21 is provided at the back case fixing position, and a back case side engagement portion 212 (to be described later) of the back case 21 is provided. On the other hand, when the back case 21 is rotated in the A1 direction with the rotation axis Po1 as a reference, the back case 21 is provided at a detachable position for the back case, and the back case 21 is engaged with the back case side described later It is assumed that it is configured to be detachable from the portion 212 (the same applies to the back case side engaging portion 212).

(Configuration-Details-Mounting base-Meat removal part)
8 is a weight reduction means for reducing the weight of the mounting base 1, and the mounting surface side facing surface 1 </ b> B of FIG. 8, which is a surface on the mounting surface 900 side of the mounting base 1, or the mounting base. 7, which is a surface on the installation surface 900 side in FIG. 1, is provided only on the installation surface facing surface 1 </ b> B, for example, a groove or a recess.

(Configuration-Details-Mounting base-Base side turning mark)
The base side rotation mark 15 is a rotation mark that serves as a reference for rotating and fixing the mounting base 1 and the case 2 to each other. Specifically, the base side rotation mark 15 is provided on the outer periphery of the mounting base 1. For example, it is a groove that indicates a reference of rotation by a relative position with a back case side rotation mark 213 to be described later, and does not face the back case side rotation mark 213 at the detachable position for the back case. This is opposed to the back case side turning mark 213 at the fixed position.

(Configuration-details-back case)
The back case 21 of FIG. 10 includes, for example, a protruding portion 211, a back case side engaging portion 212, a back case side turning mark 213, and a component case 214.

(Configuration-details-back case-protrusion)
As shown in FIG. 6, the protruding portion 211 is a storing means that stores the detection unit cover 3, specifically, a protruding portion that protrudes toward the mounting base 1, and has a rotation shaft. For example, a circular portion that protrudes corresponding to the shape of the detection unit cover 3 (that is, protrudes corresponding to the shape of the detection space 34), for example, Includes an attachment mark 211a of FIG. Note that “displaced from the rotation axis Po1” indicates that the center of the circular protrusion 211 is displaced from the rotation axis Po1, for example, the protrusion 211 on the basis of the rotation axis Po1. This shows that the outer shape of the locus of the projecting portion 211 drawn in the case of one rotation is not larger than the outer shape of the projecting portion 211 itself. The attachment mark 211a serves as a reference for attaching a name plate (not shown) that displays information (for example, model, date of manufacture, etc.) of the alarm device 100 to the protruding portion 211. Specifically, In this way, the protrusion 211 is slightly raised.

(Configuration-details-back case-back case side engagement part)
The back case side engaging portion 212 is a case fixing means for fixing the mounting base 1 and the case 2 to each other. For example, the back case 21 is made relatively to the base side engaging portion 13 of the mounting base 1. It is an engagement piece that rotates and is detachably fixed, and is engaged with and fixed to the base side engagement portion 13.

(Configuration-details-back case-back case side turning mark)
The back case side turning mark 213 is a turning mark serving as a reference for rotating and fixing the mounting base 1 and the case 2 to each other. Specifically, the back case side turning mark 213 is provided on the outer periphery of the back case 21. Yes, for example, a draw string (not shown) through which the draw string for operating the alarm device 100 is inserted, and a groove that indicates a measure of rotation according to a relative position with the base side rotation mark 15 The rear case is not opposed to the base side turning mark 15 at the detachable position, but is opposed to the base side turning mark 15 at the back case fixing position.

(Configuration-Details-Back Case-Component Case)
The component case 214 is an accommodating means for accommodating the components of the alarm device 100, and specifically, is provided at a position facing the screwing hole 12 in FIG. It is a through-hole which accommodates an information terminal. As described above, since the component case 214 is provided at a position facing the screwing hole 12, it is possible to visually confirm a transfer terminal (not shown) through the screwing hole 12.

(Assembly method)
Next, a method for assembling the alarm device 100 will be described. First, in FIG. 6, each element is mounted on the circuit board 51 of the circuit unit 5, and the detection unit cover 3 is disposed on the detection unit main body 4.

  Next, the circuit board 51 and the push button B1 for operating the alarm device 100 are arranged on the front case 22, and further, the detection unit main body 4 on which the detection unit cover 3 is arranged is arranged on the front case 22.

  Next, the back case 21 is placed on the front case 22, and the back case 21 is fixed to the front case 22 using a case fixing screw Sk 2.

  Next, a name plate (not shown) (for example, a name plate seal) is attached to the protruding portion 211 in FIG. Specifically, the nameplate seal is affixed based on the attachment mark 211a by visually recognizing the attachment mark 211a. Affix the sticker. In this way, the assembly of the alarm device 100 is completed.

(installation method)
Next, a method for attaching the alarm device 100 will be described. First, the back case 21 and the mounting base 1 of the alarm device 100 assembled as described above are provided at the detachable position for the back case in FIG. Specifically, it is provided at the detachable position for the back case while visually confirming the relative positions of the base side rotation mark 15 and the back case side rotation mark 213.

  Next, the back case 21 is rotated in the A2 direction with respect to the mounting base 1, and the back case 21 and the mounting base 1 are provided and fixed at the fixing position for the back case in FIG. Specifically, the base side rotation mark 15 and the back case side rotation mark 213 face each other while visually confirming the relative positions of the base side rotation mark 15 and the back case side rotation mark 213. And provided at the fixing position for the back case.

  Next, the base fixing screw Sk1 of FIG. 6 is screwed and fixed to the installation surface 900, and the mounting base 1 with the case 2 attached thereto is provided at the mounting base removable position of FIG. The mounting base 1 is rotated in the A1 direction with respect to the base fixing screw Sk1 of the installation surface 900, and the mounting base 1 is provided and fixed at the mounting base fixing position in FIG. This completes the installation of the alarm device 100.

(How to remove)
Next, a method for removing the alarm device 100 will be described. First, the mounting base 1 is rotated in the A2 direction with respect to the base fixing screw Sk1, and the mounting base 1 is provided at the mounting base detachable position in FIG.

  Next, the back case 21 of FIG. 14 is rotated in the A1 direction (second direction) with respect to the mounting base 1, and the back case 21 and the mounting base 1 are provided at the detachable position for the back case and removed. Specifically, the base side rotation mark 15 and the back case side rotation mark 213 are separated from each other while visually confirming the relative positions of the base side rotation mark 15 and the back case side rotation mark 213. And then remove it at the removable position for the back case. Thus, the removal of the alarm device 100 is finished.

(Effect of embodiment)
As described above, according to the present embodiment, by providing the avoidance opening 11 that is an avoidance means for avoiding interference, for example, interference between the case 2 of the alarm device 100 and the mounting base 1 is avoided. Therefore, the alarm device 100 from which a part of the case 2 protrudes can be securely attached to the installation surface 900.

  Since the avoidance opening 11 has a shape corresponding to the trajectory along which the protruding portion 211 moves, for example, the avoidance opening 11 can be prevented from becoming unnecessarily large, so that the strength of the mounting base 1 is ensured. can do.

  Since the avoidance opening 11 has a distorted circular shape, for example, since the avoidance opening 11 has no corners, the case 2 and the mounting base 1 of the alarm device 100 can be prevented from being caught and installed. The alarm device 100 can be smoothly installed on the surface 900.

  By providing the avoidance opening 11, for example, the material corresponding to the avoidance opening 11 in the mounting base 1 can be omitted, so that the alarm device 100 can be smoothly installed on the installation surface 900. And the lightweight mounting base 1 can be provided at low cost. Further, for example, since the protruding portion 211 of the back case 21 can be put into the avoidance opening 11 of the mounting base 1, the mounting is performed when the alarm device 100 is provided using the mounting base 1 on the installation surface 900. The overall thickness of the base 1 and the alarm device 100 can be reduced to give a smart impression, and the alarm device 100 can be installed without impairing the beauty of the installation location.

  By providing the attachment mark 211a, for example, the operator can indicate the reference for attaching the nameplate to the alarm device 100 to the operator, so that the work efficiency of the nameplate attachment operation of the alarm device 100 can be improved.

[Modifications to Embodiment]
Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention can be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. Can do. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above contents, and may vary depending on the implementation environment and the details of the configuration of the invention. May be solved, or only some of the effects described above may be achieved.

(About distribution and integration)
The above-described configuration is functionally conceptual and does not necessarily need to be physically configured as illustrated. In other words, the specific forms of distribution and integration of the respective units are not limited to those shown in the drawings, and all or a part thereof can be configured to be functionally or physically distributed or integrated in arbitrary units.

(About the avoidance opening (part 1))
Moreover, in the said embodiment, although the case where the avoidance opening part 11 of FIG. 7 was provided as an avoidance means was demonstrated, you may provide a recessed part or a notch instead of the avoidance opening part 11 as an avoidance means.

(About the avoidance opening (part 2))
Moreover, in the said embodiment, although the case where the avoidance opening part 11 was a distorted circular shape was demonstrated, it is not restricted to this. For example, the avoidance opening 11 may be configured as a shape that includes the locus of movement of the protrusion 211 when the case 2 and the mounting base 1 are rotated relative to each other with respect to the movement axis Po1, as an example, You may comprise in circular shape and rectangular shape considerably larger than the protrusion part 211. FIG.

(About protrusions)
Moreover, you may comprise the protrusion part 211 of the said embodiment as arbitrary shapes (for example, rectangular shape etc.) other than circular shape.

(About the base side engaging part and the back case side engaging part)
Further, in the above-described embodiment, the base side engaging portion 13 and the back case side engaging portion 212 are configured such that the direction in which the base side engaging portion 13 and the rear case side engaging portion 212 are rotated is opposite to the attaching / detaching and fixing to the installation surface 900 of the mounting base 1. However, for example, the mounting base 1 may be configured such that the attaching and detaching and fixing of the mounting base 1 and the rotating direction are the same. Specifically, when the back case 21 is rotated in the A1 direction with respect to the rotation axis Po1, the back case 21 is provided and fixed at the fixed position for the back case, while the rotation axis Po1 is the reference. When the back case 21 is rotated in the A2 direction, the back case 21 may be provided at the back case detachable position so as to be detachable. In the case of such a configuration, for example, the mounting base 1 can be fixed to and detached from the installation surface 900 by rotating the case 2 in the same direction as the fixing and detaching from the mounting base 1. It is possible to prevent the movement direction from being confused, and the alarm device 100 can be quickly attached and detached.

(Base side turning mark and back case side turning mark (1))
In the above embodiment, the base side rotation mark 15 and the back case side rotation mark 213 do not face each other at the back case attaching / detaching position, but face each other at the back case fixing position. However, for example, the rear case may be configured so as to face each other at the detachable position for the back case and not to face each other at the fixed position for the back case.

(Base side rotation mark and back case side rotation mark (2))
In the above embodiment, the base side rotation mark 15 and the back case side rotation mark 213 are configured as grooves. For example, the base side rotation mark 15 or the back case side rotation mark is described. Both of 213 may be configured as projections, or one may be configured as a projection and the other as a groove.

(Appendix)
The attachment base of Supplementary Note 1 is an attachment base provided between an installation surface on which an alarm device is installed and a cover of the alarm device, and is the attachment base for attaching the cover to the installation surface. The cover and the mounting base are fixed by rotating relative to each other with respect to a rotating shaft, and the cover is a projecting portion that protrudes toward the mounting base and is displaced from the rotating shaft. The mounting base is an avoiding means for avoiding interference between itself and the protruding portion, and at least the cover and the mounting with reference to the rotation shaft The avoiding means is provided at a position facing the protrusion when the bases are rotated relative to each other.

  The attachment base according to appendix 2 is the attachment base according to appendix 1, wherein the avoiding means projects the protrusion with respect to the cover when the cover and the attachment base are rotated relative to each other with respect to the rotation axis. The shape corresponds to the trajectory that the part moves.

  The attachment base according to appendix 3 is the attachment base according to appendix 1 or 2, wherein the protruding portion has a circular shape, and the avoiding means has a distorted circular shape.

  The mounting base of Appendix 4 is the mounting base according to any one of Appendixes 1 to 3, wherein the cover covers a detection space that is a space for detecting a detection target of the alarm device, and the cover The protruding portion protrudes corresponding to the shape of the detection space, and the avoiding means is an opening.

  The alarm device according to appendix 5 is an alarm device installed on an installation surface, and is a cover and an attachment base provided between the installation surface and the cover, and the cover is attached to the installation surface. The cover and the mounting base are fixed by rotating relative to each other with respect to a rotating shaft, and the cover protrudes toward the mounting base. And the mounting base is an avoiding means for avoiding mutual interference between itself and the protruding portion, and at least the rotating shaft is provided. When the cover and the mounting base are rotated relative to each other, the avoiding means is provided at a position facing the protruding portion, and the protruding portion of the cover has a nameplate on its own. Mounting base And a mounting mark, serving as a.

(Additional effects)
According to the mounting base described in appendix 1, by providing the avoidance means for avoiding interference, for example, interference between the cover of the alarm device and the mounting base can be avoided. The alarm device with the protruding portion can be securely attached to the installation surface.

  According to the mounting base described in appendix 2, the avoiding means has a shape corresponding to the trajectory along which the protruding portion moves, so that, for example, the avoiding means can be prevented from becoming unnecessarily large. The strength of the base can be ensured.

  According to the mounting base described in Supplementary Note 3, the avoidance means has a distorted circular shape, for example, since the avoidance means has no corners, and prevents the alarm device from being caught between the cover and the mounting base. The alarm device can be smoothly installed on the installation surface.

  According to the mounting base described in appendix 4, since the avoiding means is the opening, for example, the material of the portion corresponding to the opening in the mounting base can be omitted, so that the alarm device is installed on the installation surface. A lightweight mounting base that can be installed smoothly can be provided at low cost. In addition, for example, since the protrusion of the cover can be put in the opening of the mounting base, when the alarm device is provided using the mounting base on the installation surface, the thickness of the mounting base and the entire alarm device is reduced. A smart impression can be given, and an alarm device can be installed without impairing the beauty of the installation location.

  According to the alarm device described in appendix 5, by providing the avoidance means for avoiding interference, for example, interference between the cover of the alarm device and the mounting base can be avoided. The alarm device with the protruding portion can be securely attached to the installation surface. In addition, by providing the attachment mark, for example, it is possible to indicate to the worker a reference for attaching the nameplate to the alarm device, so that the work efficiency of the nameplate attachment operation of the alarm device can be improved.

DESCRIPTION OF SYMBOLS 1 Mounting base 1A Case side opposing surface 1B Installation surface side opposing surface 2 Case 3 Detection part cover 4 Detection part main body 5 Circuit part 11 Avoidance opening part 12 Screwing hole 13 Base side engaging part 14 Thickening part 15 Base side rotation Mark 21 Back case 22 Front case 23 Inflow / outlet opening 31 Ceiling plate 32 Labyrinth 33 Insect net 34 Detection space 41 Element cover 51 Circuit board 52 Light emitting part 53 Light receiving part 100 Alarm device 211 Projection part 211a Mounting mark 212 Back case side engagement 213 Back case side turning mark 214 Component case 900 Installation surface Po1 Rotating shaft Sk1 Base fixing screw Sk2 Case fixing screw B1 Push button

Claims (5)

An attachment base provided between an installation surface on which an alarm device is installed and a cover of the alarm device, the attachment base for attaching the cover to the installation surface;
The cover and the mounting base are fixed by rotating relative to each other with a rotation axis as a reference,
The cover includes a protrusion that protrudes toward the mounting base and is offset from the pivot shaft.
The mounting base is an avoiding means for avoiding mutual interference between the self and the projecting portion, and the projecting base protrudes at least when the cover and the mounting base are pivoted relative to each other with respect to the pivot shaft. The avoidance means provided at a position facing the part,
Mounting base. The avoiding means has a shape corresponding to a trajectory in which the protrusion moves with respect to the cover when the cover and the mounting base are rotated relative to each other with respect to the rotation axis.
The mounting base according to claim 1. The protrusion is circular,
The avoiding means is a distorted circular shape,
The mounting base according to claim 1 or 2. The cover covers a detection space that is a space for detecting a detection target of the alarm device,
The protruding portion of the cover protrudes corresponding to the shape of the detection space,
The avoidance means is an opening;
The mounting base according to any one of claims 1 to 3. An alarm device installed on the installation surface,
A cover,
An attachment base provided between the installation surface and the cover, the attachment base for attaching the cover to the installation surface;
The cover and the mounting base are fixed by rotating relative to each other with a rotation axis as a reference,
The cover is a protrusion that protrudes toward the mounting base, and includes the protrusion that is offset from the rotation shaft,
The mounting base is an avoiding means for avoiding mutual interference between the self and the projecting portion, and the projecting base protrudes at least when the cover and the mounting base are pivoted relative to each other with respect to the pivot shaft. The avoidance means provided at a position facing the part,
The protrusion of the cover includes an attachment mark serving as a reference for attaching the nameplate to itself.
Alarm device.

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