JP7787017B2 - Mounting base for alarm - Google Patents

Description

The present invention relates to a mounting base for an alarm that is fixed to a ceiling and onto which the alarm is attached.

Conventionally, there is known a mounting structure in which a four-terminal device, such as a gas alarm, is attached to a mounting base attached to the 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 hole to mount the four-terminal device to the mounting base.

Japanese Utility Model Publication No. 58-59626

However, with conventional mounting structures, it was not possible to selectively set the orientation of the four-terminal device relative to the ceiling.

The present invention was made in consideration of the above points, and aims to provide a mounting base for an alarm that allows the orientation of the alarm relative to the ceiling to be selectively set.

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 having an alarm device upper wall, and an alarm device terminal that protrudes above 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 formed in the base lower wall, into which the alarm device terminal can be inserted. The mounting base has a connection direction change portion that allows the connection direction of the lower part to the middle part to be changed.

The invention of claim 2 is an invention dependent on the invention of claim 1, and 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. At least one of the threaded hole and the through hole is formed in multiple portions in the circumferential direction.

The invention of claim 3 is an invention dependent on the invention of claim 1, and 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.

The invention according to claim 4 is an invention dependent on the invention according to claim 1, in which 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 surrounding area. 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 surrounding area, and the protrusion is selectively inserted into one of the multiple portions.

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.

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 connection orientation between the ceiling to which the middle and upper parts are attached and the alarm device attached to the lower part.

In the invention of claim 2, the orientation of the alarm device relative to the ceiling can be selectively set to discrete angles in the circumferential direction.

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

In the invention of claim 4, the orientation of the alarm device relative to the ceiling can be selectively set to discrete angles in the circumferential direction.

In the invention of claim 5, the orientation of the alarm device relative to the ceiling can be set to any angle in the circumferential direction.

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 the alarm device in the same embodiment, and Figure 1C is a bottom view of the alarm device in the same embodiment. FIG. 2 is a side cross-sectional view of the main parts of the ceiling and the mounting base in the embodiment. FIG. 3 is a bottom view of the upper part of the mounting base in the embodiment. 4A and 4B are top and side views of the middle part of the mounting base in the embodiment; 5A and 5B are side and bottom views of the lower part of the mounting base in the embodiment; 6A and 6B are side views of a portion of a middle part having a ridge and a side cross-sectional view of a portion of a lower part having a groove in the second embodiment, respectively. 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. 8A and 8B are side views of a portion of a middle part having a male thread portion in a fourth embodiment, and a side cross-sectional view of a portion of a lower part having a female thread portion in the same embodiment.

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

(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 alarm. In addition to issuing a gas leak alarm, 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 having a microcomputer, and an alarm unit that issues audio alerts. In addition to issuing gas leak alerts, this alarm device 1 is also able to transmit weather information, disaster information, etc. obtained via the communications network.

The alarm device 1 of the first embodiment also includes a human presence sensor 12. The human presence sensor 12 detects infrared rays emitted from the human body, and is directional in detecting the human body. In this alarm device 1, the alarm unit can be set to issue an alert only when a human body is detected.

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

The alarm main body 10 houses an electrical circuit board 11. The electrical circuit board 11 is, for example, a printed wiring board. The above-mentioned gas sensor, alarm unit, control unit, 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 offset from the center 100 of the lower wall 103 of the alarm towards the edge in a planar view. As a result, the position of the human presence sensor 12, which has directional properties when detecting human bodies, is offset from the center 100 of the lower wall 103 of the alarm, and the detection direction is tilted from directly 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 center in a planar view. In other words, the detection area of the human presence sensor 12 in the alarm device 1 has directional properties.

The alarm device 1 has alarm terminals 14. The alarm terminals 14 have a portion 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) circumferentially around the center 100 of the alarm device upper wall 102. 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.

(ceiling)
Next, the ceiling 2 to which the mounting base 3 is attached will be described. As shown in Figure 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.

(mounting base)
The mounting base 3 is a member for attaching 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 attached to the ceiling 2 via the mounting base 3. The mounting base 3 comprises a resin base body 30 that forms the housing (case). The base body 30 is made up of an upper part 31, a middle part 41, and a lower part 42.

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

The upper part 31 is formed with a power line insertion hole 311 through which the power line 24 passes and a signal line insertion hole 312 through which the signal line 25 passes. Attached to the underside of the upper part 31 are a fastener 33 to which the power line 24 is connected and a fastener 34 to which the signal line 25 is connected. 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.

A receiving portion 331 is provided on the underside of the upper part 31 to receive 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 integrally. 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.

A receiving portion 341 is provided on the underside of the upper part 31 to receive the signal terminal 142 of the alarm device 1. 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 integrally. By receiving the signal terminal 142 of the alarm device 1 in the receiving portion 341, electrical continuity is established between the signal terminal 142 and the signal line 25.

Furthermore, fastening holes 35 consisting of screw holes are formed on the underside of the upper part 31. In the first embodiment, the fastening holes 35 are formed in two locations.

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

When using an existing mounting base 3, the power 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.

(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.

In addition, a screw hole 57, described below, is formed in the lower wall 413 of the middle part.

(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.

Attached to the underside of the main body 421 are 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. The power line 24 and the signal line 25 pass through openings formed in the main body 421, and terminals formed at their respective bottom ends 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. The receiving portion 45 receives the power supply terminal 141 of the alarm device 1, thereby establishing electrical continuity between the power supply terminal 141 and the power line 24 via the receiving portion 45, and the receiving portion 46 receives the signal terminal 142 of the alarm device 1, thereby establishing electrical continuity between the signal terminal 142 and the signal line 25 via the receiving portion 46.

The cover portion 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 the bottom surface. The lower part 42 has a circular shape in a plan view. The main body portion 421 and cover portion 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 portion 421 is screwed into a female thread formed on the inner surface of the side wall 423, thereby fixing the main body portion 421 to the cover portion 422.

Base insertion holes 47 into which alarm terminals 14 can be inserted are formed in the base lower wall 424. The base insertion holes 47 include 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 alternately arranged circumferentially, 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.

(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.

(Connection direction change section)
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.

As shown in Figures 4A and 4B, the screw holes 57 are formed in the middle part 41 at various locations in the circumferential direction. Specifically, the screw holes 57 are formed at multiple locations in the circumferential direction of the middle part lower wall 413.

As shown in Figures 5A and 5B, the through holes 58 are formed in the lower part 42 at two locations in the circumferential direction. Specifically, the through holes 58 are formed in two locations in the circumferential direction of the lower part 42.

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

The middle part 41 has a screw hole 57 and the lower part 42 has a through hole 58. By forming multiple screw holes 57 and/or multiple through holes 58, the orientation of the lower part 42 relative to the middle part 41 can be selectively set 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.

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. Therefore, by providing the mounting base 3 with a connection orientation change unit 5, the alarm device 1 can be set in the optimal orientation relative to the mounting base 3.

Furthermore, by making the shape of the middle part 41 C-shaped in a plan view, rather than annular, 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 portions 45 and 46.

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

One, two, or three screw holes 57 may be formed in the middle part 41, and multiple (e.g., six or more) 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 multiple (e.g., six or more) screw holes 57 may be formed in the middle part 41.

Second Embodiment
Next, a mounting base 3 according to a second embodiment will be described with reference to Fig. 6. The mounting base 3 according to the second 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.

The connection direction changing section 5 in the second embodiment has a protrusion 51 and a recessed groove 52.

The ridges 51 are formed on the middle part 41 and extend circumferentially, protruding from the surrounding area. Specifically, the ridges 51 extend around the entire 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.

The recessed groove 52 is formed in the lower part 42, extends circumferentially, and has a recessed ridge 51 inserted from the periphery. Specifically, the recessed groove 52 extends along the entire inner circumferential surface of the side wall 423 of the lower part 42, and is recessed outward relative to the adjacent portions above and below this inner circumferential surface.

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 then fitting the protrusion 51 into the recessed groove 52 due to elastic deformation of the middle part side wall 411 and side wall 423.

The middle part 41 has a ridge 51 and the lower part 42 has a groove 52, so the orientation of the lower part 42 relative to the middle part 41 can be selectively set in a plan view. This makes it possible to selectively set the connection between the mounting base 3 on which the middle part 41 is attached and the alarm device 1 attached to the lower part 42.

In addition, the protrusions 51 and 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.

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

In addition, in the second embodiment, of the opposing inner and outer peripheral surfaces of the middle part 41 and the lower part 42, a protrusion 51 is formed on the outer peripheral surface and a recessed groove 52 is formed on the inner peripheral surface. In contrast, of the opposing inner and outer peripheral surfaces of the middle part 41 and the lower part 42, a recessed groove 52 may be formed on the outer peripheral surface and a protrusion 51 may be formed on the inner peripheral surface.

(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.

In the first embodiment, the connection direction changing portion 5 has a protrusion 51 and a recessed groove 52. In contrast, in the third embodiment, the connection direction changing portion 5 has a protrusion 53 and a recessed portion 54.

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

The recesses 54 are formed in the lower part 42 in multiple locations along the circumferential direction, recessed from the surrounding area, and the protrusions are selectively inserted into any of the multiple locations. Specifically, the recesses 54 are recessed outward from the surrounding inner surface at multiple equally spaced locations along the entire circumference of the inner surface of the side wall 423 of the lower part 42.

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 then fitting the protrusion 53 into the recess 54 due to elastic deformation of the middle part side wall 411 and side wall 423.

By having the middle part 41 have the protrusion 53 and the lower part 42 have the recess 54, the orientation of the lower part 42 relative to the middle part 41 can be selectively set 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.

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

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

(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 be mainly described.

In the first embodiment, the connection direction changing portion 5 has a protrusion 51 and a 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.

The male thread portion 55 is formed on the middle part 41. Specifically, the male thread portion 55 is formed on the outer peripheral surface of the middle part side wall 411 of the middle part 41.

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.

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.

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

In the fourth embodiment, the middle part 41 has an outer peripheral surface and a male thread portion 55, and the lower part 42 has an inner peripheral surface and a female thread portion 56. Alternatively, the lower part 42 may have an outer peripheral surface and a male thread portion 55, and the middle part 41 may have an inner peripheral surface and a female thread portion 56.

Alternatively, a fastener 48 consisting 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, friction 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 the middle part 41.

(Modification)
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. While a significant effect can be achieved if the alarm device 1 has some kind of directionality, it is not necessarily required that the alarm device 1 have directionality.

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 include an interface with a communications network or a human presence sensor 12, or may include other functions.

The receiving portion 331 and fastener 33 may be formed as separate bodies and then electrically connected by being joined together. The receiving portion 341 and fastener 34 may be formed as separate bodies and then electrically connected by being joined together.

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

The shape of the middle part 41 in plan view may be circular.

Note that 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.

REFERENCE SIGNS LIST 1 Alarm 10 Alarm main body 100 Center 101 Side wall 102 Alarm upper wall 103 Alarm lower wall 11 Electrical circuit board 12 Human presence sensor 13 Electrical component 14 Alarm terminal 141 Power terminal 142 Signal terminal 15 Wiring 2 Ceiling 20 Ceiling board 21 Opening 22 Attic space 23 Indoor space 24 Power line 241 Fixing device 25 Signal line 251 Fixing device 3 Mounting base 30 Base main body 31 Upper part 311 Power line insertion hole 312 Signal line insertion hole 33 Fastener 331 Receiving portion 34 Fastener 341 Receiving portion 35 Fixing hole 41 Middle part 411 Middle part side wall 412 Middle part upper wall 413 Middle part lower wall 414 Through hole 42 Lower part 421 Main body 422 Cover 423 Side wall 424 Base lower wall 425 Screw hole 45 Receiving portion 46 Receiving portion 47 Base insertion hole 471 Power terminal insertion hole 472 Signal terminal insertion hole 48 Fixture 5 Connection direction changing portion 51 Protrusion 52 Groove 53 Protrusion 54 Recess 55 Male thread portion 56 Female thread portion 57 Screw hole 58 Through hole 59 Fixture

Claims (3)

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. 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 . 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
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 .