Mounting base for alarm

Abstract

To provide a fitting base for alarms with which it is possible to selectively set the orientation of an alarm relative to a ceiling.SOLUTION: A fitting base 3 for alarms is fixed to a ceiling 2 and to which an alarm 1 is mounted. The alarm 1 has an alarm terminal 14 that projects upward from an upper wall of the alarm 1 and can be inserted into a base insertion hole. The fitting base 3 includes an upper part 31 that is fixed to the ceiling 2, a middle part 41 that is connected with the upper part 31, and a lower part 42 that has a base lower wall and is connected with the middle part 41. The lower part 42 has a base insertion hole 47 that is formed in a base lower wall 424, and which the alarm terminal 14 can be inserted into. The fitting base 3 has a connecting direction change unit 5 that enables the direction of connection of the lower part 42 to the middle part 41 to be changed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a mounting base for an alarm that is fixed to a ceiling and onto which an alarm is mounted. [Background technology]

[0002] Conventionally, there is known a mounting structure in which a four-terminal device, which is a gas alarm, is mounted on a mounting base attached to a ceiling (see, for example, Patent Document 1). The mounting base has a long hole, and the power input terminal and input / output terminals of the four-terminal device are inserted into this long hole to mount the four-terminal device on the mounting base. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Jikko No. 58-59626 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the conventional mounting structure, it is not possible to selectively set the orientation of the four-terminal device relative to the ceiling.

[0005] The present invention has been made in view of the above points, and has as its object to provide a mounting base for an alarm device that allows the orientation of the alarm device relative to the ceiling to be selectively set. [Means for solving the problem]

[0006] The mounting base for an alarm device according to claim 1 is a mounting base for an alarm device that is fixed to a ceiling and onto which an alarm device is attached. The front alarm device has an alarm device main body that has an alarm device upper wall, and an alarm device terminal that protrudes upward from the alarm device upper wall and is insertable into the base insertion hole. The mounting base has an upper part that is fixed to the ceiling, a middle part that connects to the upper part, and a lower part that has a base lower wall and is connected to the middle part. The lower part has a base insertion hole that is formed in the base lower wall and into which the alarm device terminal can be inserted. The mounting base has a connection direction change part that makes it possible to change the connection direction of the lower part to the middle part.

[0007] The invention according to claim 2 is an invention dependent on the invention according to claim 1, wherein the connection direction changing portion has a threaded hole formed in the middle part at a portion in the circumferential direction and a through hole formed in the lower part at a portion in the circumferential direction, and at least one of the threaded hole and the through hole is formed in a plurality of portions in the circumferential direction.

[0008] The invention according to claim 3 is an invention dependent on the invention according to claim 1, wherein the connection direction changing portion has a protrusion and a recessed groove. The protrusion is formed on one of the middle part and the lower part, extends circumferentially, and protrudes from the surrounding area. The recessed groove is formed on the other of the middle part and the lower part, extends circumferentially, is recessed from the surrounding area, and receives the protrusion.

[0009] The invention according to claim 4 is an invention dependent on the invention according to claim 1, wherein the connection direction changing portion has a protrusion and a recess. The protrusion is formed on one of the middle part and the lower part, and is formed in a portion in the circumferential direction and protrudes from the surroundings. The recess is formed on the other of the middle part and the lower part, and is formed in multiple portions in the circumferential direction and recessed from the surroundings, and the protrusion is selectively inserted into one of the multiple portions.

[0010] The invention of claim 5 is an invention dependent on the invention of claim 1, and the connection direction changing portion is provided on the middle part and the lower part and has a male thread portion and a female thread portion that screw together. [Effects of the Invention]

[0011] In the invention of claim 1, the orientation of the lower part relative to the middle part can be selectively set, thereby making it possible to selectively set the orientation of the connection between the ceiling to which the middle and upper parts are attached and the alarm device attached to the lower part.

[0012] In the invention according to claim 2, the orientation of the alarm device relative to the ceiling can be selectively set to a discrete angle in the circumferential direction.

[0013] In the invention according to claim 3, the orientation of the alarm device relative to the ceiling can be set at any angle in the circumferential direction.

[0014] In the invention according to claim 4, the orientation of the alarm device relative to the ceiling can be selectively set to a discrete angle in the circumferential direction.

[0015] In the invention according to claim 5, the orientation of the alarm device relative to the ceiling can be set at any angle in the circumferential direction. [Brief explanation of the drawings]

[0016] [Figure 1] Figure 1A is a top view of an alarm device in a first embodiment of the present invention, Figure 1B is a side view of an alarm device in the same embodiment, and Figure 1C is a bottom view of an alarm device in the same embodiment. [Figure 2] FIG. 2 is a side cross-sectional view of the main parts of the ceiling and the mounting base in the embodiment. [Figure 3] FIG. 3 is a bottom view of the upper part of the mounting base in the embodiment. [Figure 4]4A and 4B are top and side views of the middle part of the mounting base in the embodiment of the present invention; [Figure 5] 5A and 5B are side and bottom views of the lower part of the mounting base in the embodiment. [Figure 6] 6A is a side view of a portion of a middle part having a ridge in a second embodiment, and FIG 6B is a side cross-sectional view of a portion of a lower part having a recessed groove in the same embodiment. [Figure 7] 7A and 7B are side views of a portion of a middle part having a protrusion and a side cross-sectional view of a portion of a lower part having a recess in the third embodiment, respectively. [Figure 8] 8A and 8B are side views of a portion of a middle part having a male thread portion in the fourth embodiment, and a side cross-sectional view of a portion of a lower part having a female thread portion in the same embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention relates to a mounting base for an alarm device. As shown in Figures 1A to 2, a mounting base 3 for an alarm device is fixed to a ceiling 2, and an alarm device 1 is attached to it. A first embodiment will be described with reference to the drawings. First, the alarm device 1 will be described.

[0018] (Alarm) The alarm device 1 shown in Figures 1A to 1C is a ceiling-mounted alarm device. The alarm device 1 is primarily attached to the ceiling 2 of a room such as a kitchen in a building. The alarm device 1 is a gas leak alarm that has a gas sensor and an alarm unit, and detects and issues a gas leak alert. In addition to alerting users to gas leaks, the alarm device 1 may also transmit various types of information. The alarm device 1 of the first embodiment is equipped with an interface for communicating via a communications network such as the Internet, a control unit that has a microcomputer, and an alarm unit that issues alerts by voice. In addition to alerting users to gas leaks, this alarm device 1 is also able to transmit weather information, disaster information, etc. obtained via the communications network.

[0019] Furthermore, the alarm device 1 of the first embodiment is equipped with a human presence sensor 12. The human presence sensor 12 detects infrared rays emitted from the human body, and has directionality in detecting the human body. With this alarm device 1, it is possible to have the alarm section issue an alert only when a human body is detected.

[0020] The alarm device 1 is equipped with a resin alarm main body 10 that forms the housing (case). The alarm main body 10 has a cylindrical side wall 101, an alarm upper wall 102 that is formed at the upper end of the side wall 101 and forms the top surface of the alarm main body 10, and an alarm lower wall 103 that is formed at the lower end of the side wall 101 and forms the bottom surface of the alarm main body 10. The shapes of the alarm upper wall 102 and alarm lower wall 103 are circular when viewed from above.

[0021] An electrical circuit board 11 is housed in the alarm main body 10. The electrical circuit board 11 is, for example, a printed wiring board. The above-mentioned gas sensor, alarm section, control section, interface and human presence sensor 12 are mounted on the electrical circuit board 11. The human presence sensor 12 is exposed below the alarm main body 10 via an opening formed in the lower wall 103 of the alarm. Due to its relationship with the other electrical components 13 mounted on the electrical circuit board 11, the human presence sensor 12 is positioned in a position that is shifted from the centre 100 of the lower wall 103 of the alarm in a planar view, towards the edge. For this reason, the position of the human presence sensor 12, which has directional properties when detecting human bodies, is shifted away from the centre 100 of the lower wall 103 of the alarm, and the direction of detection is inclined relative to straight below. The detection area of ​​the human presence sensor 12 in this alarm device 1 is not a symmetrical area with the alarm device 1 at the centre in a planar view. In other words, the detection area of ​​the human presence sensor 12 in the alarm device 1 has directional properties.

[0022] The alarm device 1 has alarm terminals 14. The alarm terminals 14 have a section that protrudes upward from the alarm device upper wall 102. Two power supply terminals 141 and two signal terminals 142 are provided as the alarm terminals 14. As shown in FIG. 1A, the power supply terminals 141 and signal terminals 142 are positioned at equal intervals (every 90 degrees) in the circumferential direction, with the centre 100 of the alarm device upper wall 102 as the centre. The power supply terminals 141 and signal terminals 142 are arranged alternately in the circumferential direction, with pairs of power supply terminals 141 facing each other, and pairs of signal terminals 142 facing each other. The power supply terminals 141 and signal terminals 142 are electrically connected to the electrical board 11 via wiring 15.

[0023] (ceiling) Next, the ceiling 2 to which the mounting base 3 is attached will be described. As shown in Fig. 2, an opening 21 is formed in a ceiling panel 20 that constitutes the ceiling 2, allowing a ceiling space 22 to communicate with an indoor space 23. The mounting base 3 is attached to the portion of the ceiling panel 20 where the opening 21 is formed. A power line 24 and a signal line 25 are arranged in the ceiling space. One end of the power line 24 is connected to a commercial power source of, for example, AC 100V. Furthermore, one end of the signal line 25 is connected to an external central control device or the like.

[0024] (mounting base) The mounting base 3 is a component for mounting the alarm device 1 to the ceiling 2. The mounting base 3 is fixed to the ceiling 2. By attaching the alarm device 1 to the mounting base 3, the alarm device 1 is indirectly mounted to the ceiling 2 via the mounting base 3. The mounting base 3 comprises a resin base main body 30 that forms the housing (case). The base main body 30 is made up of an upper part 31, a middle part 41, and a lower part 42.

[0025] (Upper part) 3, upper part 31 has a circular shape in a plan view. Upper part 31 is attached to the underside of ceiling board 20 around opening 21. Upper part 31 is attached to ceiling board 20 by an appropriate method such as screw fastening.

[0026] The upper part 31 is formed with a power line insertion hole 311 through which the power line 24 is inserted and a signal line insertion hole 312 through which the signal line 25 passes. A fastener 33 to which the power line 24 is connected and a fastener 34 to which the signal line 25 is connected are attached to the underside of the upper part 31. The power line 24 passes from the attic space 22 through the opening 21 in the ceiling board 20 and the power line insertion hole 311 in the upper part 31 in that order, and the terminal at the end of the power line 24 is attached to the fastener 33 on the underside of the upper part 31 with a fastener 241 such as a screw. The signal line 25 passes from the attic space 22 through the opening 21 in the ceiling board 20 and the signal line insertion hole 312 in the upper part 31 in that order, and the terminal at the end of the signal line 25 is attached to the fastener 34 on the underside of the upper part 31 with a fastener 251 such as a screw.

[0027] A receiving portion 331 is provided on the underside of the upper part 31, which receives the power supply terminal 141 of the alarm device 1. The receiving portion 331 is electrically connected to the fastener 33, and in the first embodiment the receiving portion 331 and fastener 33 are formed as a single unit. By receiving the power supply terminal 141 of the alarm device 1 in the receiving portion 331, electrical continuity is established between the power supply terminal 141 and the power line 24.

[0028] A receiving portion 341 that receives the signal terminal 142 of the alarm device 1 is provided on the underside of the upper part 31. The receiving portion 341 is electrically connected to the fastener 34, and in the first embodiment the receiving portion 341 and fastener 34 are formed as a single unit. By receiving the signal terminal 142 of the alarm device 1 in the receiving portion 341, the signal terminal 142 and the signal wire 25 are brought into electrical continuity.

[0029] Furthermore, fastening holes 35, which are screw holes, are formed on the lower surface of the upper part 31. In the first embodiment, the fastening holes 35 are formed in two places.

[0030] Although power line 24 can be attached to fastener 33 on the underside of upper part 31, in the present invention it is connected to receiving portion 45 of lower part 42, which will be described later. Furthermore, signal line 25 can be attached to fastener 34 on the underside of upper part 31, but in the present invention it is connected to receiving portion 46 of lower part 42.

[0031] When using an existing mounting base 3, the power supply line 24 attached to the fastener 33 of the existing upper part 31 can be removed and connected to the receiving portion 45 of the lower part 42, and the signal line 25 attached to the fastener 34 of the existing upper part 31 can be removed and connected to the receiving portion 46 of the lower part 42.

[0032] (Middle part) 4A and 4B, the middle part 41 has a generally cylindrical middle part side wall 411, a middle part upper wall 412 formed at the upper end of the middle part side wall 411 and constituting the top surface, and a middle part lower wall 413 formed at the lower end of the middle part side wall 411 and constituting the bottom surface. The middle part 41 has a C-shape in plan view. The middle part 41 is attached to the upper part 31. A through hole 414 through which a fastener is inserted is formed in the middle part 41 at a position corresponding to the fastening hole 35 of the upper part 31.

[0033] Furthermore, a screw hole 57, which will be described later, is formed in the lower wall 413 of the middle part.

[0034] (Lower part) 5A and 5B, the lower part 42 has a main body portion 421 and a cover portion 422. The main body portion 421 is a plate-like member that is circular in plan view.

[0035] A fastener to which the power line 24 is connected and a receiving portion 45 electrically connected to this fastener, and a fastener to which the signal line 25 is connected and a receiving portion 46 electrically connected to this fastener are attached to the underside of the main body portion 421. The power line 24 and the signal line 25 pass through openings formed in the main body portion 421, and terminals formed at the bottom ends of each are attached to the fasteners with fasteners such as screws. The receiving portion 45 is similar to the receiving portion 331 of the mounting base 3, and the receiving portion 46 is similar to the receiving portion 341 of the mounting base 3. By receiving the power supply terminal 141 of the alarm device 1 in the receiving portion 45, the power supply terminal 141 is established in conduction with the power line 24 via the receiving portion 45, and by receiving the signal terminal 142 of the alarm device 1 in the receiving portion 46, the signal terminal 142 is established in conduction with the signal line 25 via the receiving portion 46.

[0036] The cover part 422 has a cylindrical side wall 423 and a base lower wall 424 formed at the lower end of the side wall 423 and constituting a bottom part. The lower part 42 has a circular shape in a plan view. The main body part 421 and the cover part 422 are fixed by an appropriate method such as screwing, threading, welding, or adhesive. For example, a male thread formed on the outer peripheral end surface of the main body part 421 is screwed into a female thread formed on the inner surface of the side wall 423, thereby fixing the main body part 421 to the cover part 422.

[0037] The base lower wall 424 is formed with base insertion holes 47 into which the alarm terminals 14 can be inserted. The base insertion holes 47 are provided with two power supply terminal insertion holes 471 and two signal terminal insertion holes 472. The power supply terminal insertion holes 471 and the signal terminal insertion holes 472 are positioned at equal intervals (every 90 degrees) circumferentially around the center of the base lower wall 424. The power supply terminal insertion holes 471 and the signal terminal insertion holes 472 are arranged alternately in the circumferential direction, with pairs of power supply terminal insertion holes 471 facing each other and pairs of signal terminal insertion holes 472 facing each other. A power supply terminal 141 can be inserted into the power supply terminal insertion hole 471 from below, and a signal terminal 142 can be inserted into the signal terminal insertion hole 472 from below.

[0038] (Attaching the alarm to the mounting base) To attach the alarm device 1 to the mounting base 3, the power supply terminal 141 and signal terminal 142 of the alarm device 1 are inserted upward from their prescribed insertion positions into the power supply terminal insertion hole 471 and signal terminal insertion hole 472 of the mounting base 3, respectively. Next, when the alarm device 1 is rotated, the power supply terminal 141 moves within the power supply terminal insertion hole 471, and the signal terminal 142 moves within the signal terminal insertion hole 472. The tip of the power supply terminal 141 is received in the receiving portion 45 of the mounting base 3, and the tip of the signal terminal 142 is received in the receiving portion 46 of the mounting base 3, and the alarm device 1 is attached to the mounting base 3.

[0039] (Connection direction change part) The mounting base 3 has a connection direction changing portion 5 that allows the direction of connection of the lower part 42 to the middle part 41 to be changed. The connection direction changing portion 5 in the first embodiment has a screw hole 57 and a through hole 58.

[0040] 4A and 4B, the screw holes 57 are formed in the middle part 41 at any part in the circumferential direction. Specifically, the screw holes 57 are formed in a plurality of positions in the circumferential direction of the lower wall 413 of the middle part.

[0041] 5A and 5B, the through-holes 58 are formed in the lower part 42 at two locations in the circumferential direction.

[0042] As shown in FIG. 5, the middle part 41 and the lower part 42 are connected by inserting a fastener 59 made of a screw into a through-hole 58 of the lower part 42 from below and screwing it into a threaded hole 57 of the middle part 41.

[0043] The middle part 41 has a screw hole 57 and the lower part 42 has a through hole 58, and by forming multiple screw holes 57 and / or multiple through holes 58, it is possible to selectively set the orientation of the lower part 42 relative to the middle part 41 in a plan view. This makes it possible to discretely and selectively set the connection angle between the mounting base 3 to which the middle part 41 is attached and the alarm device 1 attached to the lower part 42.

[0044] The alarm device 1 in the first embodiment is equipped with a human presence sensor 12, and the detection area of ​​the human presence sensor 12 has directionality. For this reason, by providing the mounting base 3 with a connection orientation change section 5, the alarm device 1 can be set in the optimal orientation relative to the mounting base 3.

[0045] Furthermore, by making the shape of the middle part 41 C-shaped in a plan view and not ring-shaped, the middle part 41 can be inserted between the upper part 31 and the lower part 42 after the power line 24 and the signal line 25 are attached to the receiving portion 45 and the receiving portion 46.

[0046] Furthermore, if there are multiple threaded holes 57 formed in the middle part 41 and multiple through holes 58 formed in the lower part 42, it becomes possible to discretely and selectively set the angle of connection of the alarm device 1 attached to the lower part 42.

[0047] One, two, or three screw holes 57 may be formed in the middle part 41, and a large number (e.g., six or more) of through holes 58 may be formed in the lower part 42, or one, two, or three through holes 58 may be formed in the lower part 42, and a large number (e.g., six or more) of screw holes 57 may be formed in the middle part 41.

[0048] Second Embodiment Next, the mounting base 3 according to the second embodiment will be described with reference to Fig. 6. The mounting base 3 according to the second embodiment is mostly the same as the mounting base 3 according to the first embodiment. Therefore, explanations that overlap with the first embodiment will be omitted, and differences will mainly be described.

[0049] The connection direction changing portion 5 in the second embodiment has a ridge 51 and a recessed groove 52.

[0050] The protrusions 51 are formed on the middle part 41, extend in the circumferential direction, and protrude from the surrounding area. Specifically, the protrusions 51 extend all around the outer periphery of the middle part side wall 411 of the middle part 41, protruding outward from adjacent portions above and below this outer periphery.

[0051] The recessed groove 52 is formed in the lower part 42, extends in the circumferential direction, and has the recessed ridge 51 inserted therein from the periphery. Specifically, the recessed groove 52 extends along the entire periphery of the inner circumferential surface of the side wall 423 of the lower part 42, and is recessed outward from adjacent portions of the inner circumferential surface above and below.

[0052] The middle part 41 and the lower part 42 are connected by inserting the side wall 423 into the middle part side wall 411 and fitting the protrusion 51 into the recessed groove 52 by elastic deformation of the middle part side wall 411 and the side wall 423.

[0053] Because the middle part 41 has the ridge 51 and the lower part 42 has the recessed groove 52, it is possible to selectively set the orientation of the lower part 42 relative to the middle part 41 in a plan view. This makes it possible to selectively set the connection between the mounting base 3 to which the middle part 41 is attached and the alarm device 1 attached to the lower part 42.

[0054] Furthermore, the ridges 51 and recessed grooves 52 allow the orientation of the alarm device 1 relative to the mounting base 3 to be set at any angle in the circumferential direction.

[0055] In the second embodiment, the outer peripheral surface of the lower end portion of the middle part side wall 411 of the middle part 41 and the inner peripheral surface of the upper end portion of the side wall 423 of the lower part 42 face each other. However, the inner peripheral surface of the lower end portion of the middle part side wall 411 of the middle part 41 and the outer peripheral surface of the upper end portion of the side wall 423 of the lower part 42 may face each other.

[0056] In the second embodiment, the protrusions 51 are formed on the outer peripheral surface and the recessed grooves 52 are formed on the inner peripheral surface of the opposing inner and outer peripheral surfaces of the middle part 41 and the lower part 42. However, the recessed grooves 52 may be formed on the outer peripheral surface and the protrusions 51 may be formed on the inner peripheral surface of the opposing inner and outer peripheral surfaces of the middle part 41 and the lower part 42.

[0057] (Third embodiment) Next, a mounting base 3 according to a third embodiment will be described with reference to Fig. 7. The mounting base 3 according to the third embodiment is largely the same as the mounting base 3 according to the first embodiment. Therefore, explanations that overlap with the first embodiment will be omitted, and differences will be mainly described.

[0058] In the first embodiment, the connecting direction changing portion 5 has the protrusion 51 and the recessed groove 52. In contrast, in the third embodiment, the connecting direction changing portion 5 has the protrusion 53 and the recessed portion 54.

[0059] The protrusion 53 is formed on the middle part 41, and is formed at any part in the circumferential direction and protrudes from the surrounding area. Specifically, the protrusion 53 protrudes outward from any part of the outer circumferential surface of the middle part side wall 411 of the middle part 41 beyond the surrounding area.

[0060] The recesses 54 are formed in the lower part 42, and are formed in a plurality of portions in any one of the circumferential directions so as to be recessed from the surrounding area, and the protrusions are selectively inserted into any one of the plurality of portions. Specifically, the recesses 54 are recessed outward from the surrounding inner circumferential surface at a plurality of equally spaced locations along the entire circumference of the inner circumferential surface of the side wall 423 of the lower part 42.

[0061] The middle part 41 and the lower part 42 are connected by inserting the side wall 423 into the middle part side wall 411 and fitting the protrusion 53 into the recess 54 by elastic deformation of the middle part side wall 411 and the side wall 423.

[0062] Because the middle part 41 has the protrusion 53 and the lower part 42 has the recess 54, it is possible to selectively set the orientation of the lower part 42 relative to the middle part 41 in a plan view. This makes it possible to discretely and selectively set the connection angle between the mounting base 3 to which the middle part 41 is attached and the alarm device 1 attached to the lower part 42.

[0063] In the third embodiment, the outer peripheral surface of the lower end portion of the middle part side wall 411 of the middle part 41 and the inner peripheral surface of the upper end portion of the side wall 423 of the lower part 42 face each other. However, the inner peripheral surface of the lower end portion of the middle part side wall 411 of the middle part 41 and the outer peripheral surface of the upper end portion of the side wall 423 of the lower part 42 may face each other.

[0064] In the third embodiment, the protrusions 53 are formed on the outer peripheral surface and the recesses 54 are formed on the inner peripheral surface of the opposing inner and outer peripheral surfaces of the middle part 41 and the lower part 42. However, the recesses 54 may be formed on the outer peripheral surface and the protrusions 53 may be formed on the inner peripheral surface of the opposing inner and outer peripheral surfaces of the middle part 41 and the lower part 42.

[0065] (Fourth embodiment) Next, a mounting base 3 according to a fourth embodiment will be described with reference to Fig. 8. The mounting base 3 according to the fourth embodiment is largely the same as the mounting base 3 according to the first embodiment. Therefore, explanations that overlap with the first embodiment will be omitted, and differences will mainly be described.

[0066] In the first embodiment, the connection direction changing portion 5 has the ridge 51 and the recessed groove 52. In contrast, in the fourth embodiment, the connection direction changing portion 5 has a male thread portion 55 and a female thread portion 56.

[0067] The male thread portion 55 is formed in the middle part 41. Specifically, the male thread portion 55 is formed on the outer circumferential surface of the middle part side wall 411 of the middle part 41.

[0068] The female thread portion 56 is formed in the lower part 42. Specifically, the female thread portion 56 is formed on the inner circumferential surface of the side wall 423 of the lower part 42.

[0069] The middle part 41 and the lower part 42 are connected by screwing the male threaded portion 55 and the female threaded portion 56 together.

[0070] Since the middle part 41 has the male thread portion 55 and the lower part 42 has the female thread portion 56, the orientation of the lower part 42 relative to the middle part 41 can be set at any angle in the circumferential direction in a plan view.

[0071] In the fourth embodiment, the middle part 41 has an outer circumferential surface and the male thread portion 55, and the lower part 42 has an inner circumferential surface and the female thread portion 56. However, the lower part 42 may have an outer circumferential surface and the male thread portion 55, and the middle part 41 may have an inner circumferential surface and the female thread portion 56.

[0072] Alternatively, a fastener 48 made of a screw may be screwed into a threaded hole 425 formed in the lower part 42, and the tip of the fastener 48 may be pressed against the middle part 41. In this way, a frictional force is generated between the tip of the fastener 48 and the middle part 41, making it difficult for the lower part 42 to rotate relative to the middle part 41 and the lower part 42 to fall off from the middle part 41.

[0073] (Variation) The room in which the alarm device 1 is installed is not limited to a kitchen. The alarm device 1 can be installed on the ceiling 2 of any room. There are no particular restrictions on the shape, size, material, etc. of the alarm device main body 10. A significant effect can be achieved if the alarm device 1 has some kind of directionality, but the alarm device 1 does not necessarily have to be directional.

[0074] The human presence sensor 12 is not limited to an infrared detection type. The alarm device 1 is not limited to one that issues a gas leak alert. The alarm device 1 may have an alert unit and issue an alert of some kind. Alerts issued by the alert unit are not limited to audio alerts, and may also be alerts using light, display, etc. Furthermore, the alarm device 1 does not have to be equipped with an interface to a communications network or a human presence sensor 12, or may be equipped with other functions.

[0075] The receiving portion 331 and the fastener 33 may be formed as separate bodies and then electrically connected by being coupled together. The receiving portion 341 and the fastener 34 may be formed as separate bodies and then electrically connected by being coupled together.

[0076] The shape, size, material, etc. of the mounting base 3 (upper part 31, middle part 41, and lower part 42) are not particularly limited.

[0077] The shape of the middle part 41 in a plan view may be circular.

[0078] The above-described embodiment is merely one of various embodiments of the present invention, and the present invention is not limited to the above-described embodiment. [Explanation of symbols]

[0079] 1 alarm 10 Alarm body 100 center 101 Side wall 102 Alarm upper wall 103 Lower wall of alarm 11 Electrical board 12 Human Sensor 13 Electrical Components 14 Alarm terminal 141 Power supply terminal 142 Signal terminal 15 Wiring 2. Ceiling 20 Ceiling Panel 21 Aperture 22 Attic space 23 Indoor space 24 Power line 241 Fasteners 25 Signal line 251 Fasteners 3 Mounting base 30 Base body 31 Upper part 311 Power line insertion hole 312 Signal line insertion hole 33 Fasteners 331 Receiving part 34 Fasteners 341 Receiving part 35 Fixing hole 41 Middle part 411 Middle part side wall 412 Middle part upper wall 413 Middle part bottom wall 414 Through hole 42 Lower part 421 Main body 422 Cover part 423 Side wall 424 Base Lower Wall 425 screw hole 45 Receiving part 46 Receiving part 47 Base insertion hole 471 Power terminal insertion hole 472 Signal terminal insertion hole 48 Fastener 5 Connection direction change section 51 protrusion 52 Groove 53 protrusion 54 Recess 55 Male thread 56 Female thread 57 screw hole 58 Through Hole 59 Fasteners

Claims

1. A mounting base for an alarm that is fixed to a ceiling and on which an alarm is mounted, The front alarm device has an alarm device main body having an alarm device upper wall, and an alarm device terminal that protrudes upward from the alarm device upper wall, the mounting base includes an upper part fixed to a ceiling, a middle part connected to the upper part, and a lower part having a base lower wall and connected to the middle part; the lower part has a base insertion hole formed in a lower wall of the base into which the alarm terminal can be inserted, the mounting base has a connection direction changing portion that can change the connection direction of the lower part relative to the middle part, The connection direction change unit is A screw hole formed in the middle part and formed at any part in the circumferential direction; a through hole formed in the lower part at any part in the circumferential direction, At least one of the screw holes and the through holes is formed at a plurality of portions in the circumferential direction. Mounting base for alarms.

2. A mounting base for an alarm that is fixed to a ceiling and on which an alarm is mounted, The front alarm device has an alarm device main body having an alarm device upper wall, and an alarm device terminal that protrudes upward from the alarm device upper wall, the mounting base includes an upper part fixed to a ceiling, a middle part connected to the upper part, and a lower part having a base lower wall and connected to the middle part; the lower part has a base insertion hole formed in a lower wall of the base into which the alarm terminal can be inserted, the mounting base has a connection direction changing portion that can change the connection direction of the lower part relative to the middle part, The connection direction change unit is a protrusion formed on one of the middle part and the lower part, the protrusion being formed at a position in the circumferential direction and protruding from the surrounding area; a recess formed in the other of the middle part and the lower part, the recess being formed in a plurality of portions in any one of the circumferential directions and recessed from the surroundings, the protrusion being selectively inserted into any one of the plurality of portions; Mounting base for alarms.

3. A mounting base for an alarm that is fixed to a ceiling and to which an alarm is attached, The front alarm device has an alarm device main body having an alarm device upper wall, and an alarm device terminal that protrudes upward from the alarm device upper wall, the mounting base includes an upper part fixed to a ceiling, a middle part connected to the upper part, and a lower part having a base lower wall and connected to the middle part; the lower part has a base insertion hole formed in a lower wall of the base into which the alarm terminal can be inserted, the mounting base has a connection direction changing portion that can change the connection direction of the lower part relative to the middle part, The connection direction change unit is The middle part and the lower part have a male thread portion and a female thread portion that are screwed together. Mounting base for alarms.

Images