JP3925475B2 - Fire detector - Google Patents

Description

  The present invention relates to a structure of a fire detector that is installed and used on a ceiling surface or the like in a house without constituting a detector line.

  Conventionally, as a fire detector comprising a mounting base attached to an indoor wall surface such as a ceiling surface and a sensor head that can detect a fire factor and can be assembled to the mounting base, Patent Document 1 discloses What is disclosed is known. This is configured by mounting a mounting surface for a gas leak alarm with a fire alarm function on a mounting base constructed and wired on a ceiling or a wall surface. However, in this structure, since the electric wires are passed through the ceiling, it is necessary to install them at the time of building construction, and it is difficult to equip them after construction.

  In order to solve the problem, as shown in FIGS. 8 to 10, the mounting base 101 fixed to the ceiling surface S is detachably equipped with a sensor head 102 having a sensor unit 103. A retrofit fire detector C has been developed. It is configured so that the power supply cord 104 and the signal line 105 can be easily wired along the indoor wall such as the ceiling and side walls of the room, and the building is completed without constructing the sensor line. It is convenient because it can be installed after installation.

  That is, the sensor head 102 issues a warning by transmitting a power supply cord 104 having a power supply plug 104a at the tip and a detection signal from the sensor unit 103 to supply power to the sensor unit 103 from a commercial power source. A signal line 105 for conducting to an alarm unit (attached at another location, see FIG. 8) 106 is taken out. The sensor head 102 is equipped with a pull switch 107 and a push switch 108 for controlling the stop of the alarm operation, an alarm buzzer unit 109, an alarm display unit 110 including a light source, and the like.

  The mounting base 101 includes a disc-shaped base main body 101a screwed to the ceiling surface S and a protruding cylinder 101b integrally formed at the center thereof, and a pair of engagements is provided at the tip of the protruding cylinder 101b. The pawl 101c is integrally formed. On the other hand, the circular sensor head 102 in a plan view is engaged with the locking claw 101c by inserting the lower end portion of the protruding cylinder 101b into the center of the upper surface and slightly rotating in this state. An engagement recess 102a (which is attached to a known structure and will be briefly described) is formed, and a power supply cord 104 derived from the vicinity of the engagement recess 102a as a base end, and a sensor And a signal line 105 taken out from a terminal portion 102b arranged and formed on the outer end portion of the upper surface of the head 102.

  When mounting to the ceiling surface S, the mounting base 101 is first screwed and fixed at a predetermined position, and then the sensor head 102 is assembled. In this case, the signal line 105, the power supply cord 104, To arrange. That is, the signal line 105 is routed to the surface of the ceiling surface S and routed and fixed first. Then, the power feeding cord 104 is routed along the ceiling surface or the side wall surface, but the surplus portion of the power feeding cord 104 is formed between the mounting base 101 and the sensor head 102 as shown in FIG. In the cord winding and receiving space, the protruding cylinder 101b is wound and accommodated, and finally the power plug 104a is inserted into an outlet (not shown) to complete the connection and power is supplied.

  In the conventional fire detector C described above, since the signal line 105 is led out from the upper surface of the sensor head 102, when the power supply cord 104 is wound around the boss part 101b after the signal line 105 is connected to the terminal part 102b. In addition, there is a problem that the signal line 105 gets in the way and the workability is poor. In addition, since the terminal portion 102b is at a position spaced downward from the ceiling surface S, the signal line 105 taken out from the terminal portion 102b has a base end portion separated from the ceiling surface S as shown in FIG. Since the wiring is carried out in a curved state so as to reach the point, the appearance is not good.

  As a countermeasure, for example, it is conceivable to use the technology of the gas leak alarm disclosed in Patent Document 2. That is, in Patent Document 2, in a mounting structure in which a gas leak alarm is assembled to a wall fixing hook fixed to a wall or the like, the alarm can be electrically connected to the hook. The signal line is taken out of the cable. However, if this technique is applied to the fire detector shown in FIGS. 8 to 10, it seems that the problem of signal line processing can be solved, but it is not so easy.

That is, what is disclosed in Patent Document 2 (particularly, those depicted in FIGS. 2 to 5 of Document 2) is a wall-hanging type, and the winding and storing of the power supply cord is irrelevant to the presence or absence of an alarm device. However, when the fire detector is fixed to the ceiling, there is a problem of how to deal with the fall of the winding cord when the detector head is removed. In addition, as a joint structure between the sensor head and the mounting base, in the structure disclosed in Patent Document 2 (a structure in which the pin is fitted into the hole and rotated slightly), the pin is applied when an external force is applied. However, there is still a problem that the integrated strength is weak. In addition, in order to compensate for the weakness of the strength, it is necessary to increase the diameter of the cord winding portion. As a result, there is a problem that the winding length of the cord is limited.
JP 11-328556 A JP 2000-322669 A

  An object of the present invention is to provide a power supply for a fire detector comprising a mounting base attached to an indoor wall surface such as a ceiling surface, and a sensor head that can be assembled to the mounting base by providing a sensor for detecting a fire factor. When wrapping the cord, a fire sensor that allows the signal line to be mounted on the wall with good workability without hindering the connection and that the mounting base and sensor head are coupled with sufficient coupling strength. It is to provide.

The configuration of claim 1 proposed to achieve the above object is provided with a mounting base attached to an indoor wall surface such as a ceiling surface, and a sensor for detecting a fire factor, and a sensor which can be assembled to the mounting base. In the fire sensor comprising a head, the sensor head leads a power supply cord having a power supply plug at a tip, and the mounting base is a signal line for sending a detection signal to a separately installed alarm unit. The attachment base and the sensor head correspond to a fitting connection portion having a corresponding signal line connection portion that is fitted when the attachment base and the sensor head are coupled to each other by a rotation operation. provided Te, fitting connecting portion provided on the sensor head side, the rising peripheral walls forming a recess in the center, and no code winding portion for winding the power supply cord, the attachment The fitting connection portion provided on the cable side forms a boss portion that is fitted into the cord winding portion when the sensor head and the mounting base are coupled, and the cord on the sensor head side A conductive contact and a conductive connection portion that sandwiches the conductive contact and makes an electrical connection are provided in correspondence with the central recess of the winding portion and the boss portion on the mounting base side. It is characterized by that.

  According to a second aspect of the present invention, in the first aspect, the boss portion on the mounting base side is formed with a hole portion, and the conductive connection portion is provided in the hole portion. A conductive contact is provided in the central recess of the part.

  According to a third aspect of the present invention, in the first aspect, the sensor head forms a hollow recess in the outer periphery of the cord winding portion to form a power feeding cord housing portion that houses the power feeding cord. It is characterized by.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the mounting base has a wiring accommodating portion that accommodates the signal line recessed in the outer periphery of the boss portion. .

  According to a fifth aspect of the present invention, in the fourth aspect, a plurality of knockout holes for forming openings for leading the signal lines to the outside are formed on the peripheral wall of the wiring housing part. Features.

  According to a sixth aspect of the present invention, in the third aspect of the present invention, a plurality of knockout holes for forming openings for leading the power supply cord to the outside are addressed to the outer peripheral wall of the power supply cord housing portion of the sensor head. , Formed.

According to a seventh aspect of the present invention, there is provided a fire detector comprising: a mounting base attached to an indoor wall surface such as a ceiling surface; and a sensor head that can be assembled to the mounting base by providing a sensing unit that senses a fire factor. The mounting base leads a signal line for sending a detection signal to a separately installed alarm unit, and leads a power supply cord having a power supply plug at the tip, the mounting base, the sensor head, Is provided with a corresponding fitting connection portion having a corresponding signal line connection portion and a feeding line connection portion, which are fitted when they are coupled to each other by a rotating operation, The fitting connection portion provided on the side forms a cord winding portion having a rising peripheral wall around which the power supply cord is wound, and the fitting connection portion provided on the sensor head side is provided on the sensor head. Center A recess is formed, and the signal winding portion, the cord winding portion on the mounting base side, and the recess on the sensor head side inserted into the cord winding portion, The present invention is characterized in that a conductive contact that forms a feeder line connection portion and a conductive connection portion that sandwiches the conductive contact and makes electrical connection are provided in correspondence with each other.

  The structure of claim 8 is that, in claim 7, the sensor head forms a hollow recess in the outer periphery of the recess to constitute a power supply cord accommodating portion for accommodating the power supply cord. Features.

  According to a ninth aspect of the present invention, in the seventh or eighth aspect, the attachment base has a wiring accommodating portion for accommodating the signal line, which is recessed in the outer periphery of the cord winding portion. To do.

  According to a tenth aspect of the present invention, in the ninth aspect, a plurality of knockout holes for forming openings for leading out the signal lines to the outside are formed on the peripheral wall of the wiring housing portion. Features.

  The structure of claim 11 is the structure according to claim 8, wherein a plurality of knockout holes for forming openings for leading the power supply cord to the outside are addressed to the outer peripheral wall of the power supply cord housing portion of the sensor head. , Formed.

  In the fire detector according to claim 1, since the signal line is led out from the mounting base, when the power supply cord is wound around the sensor head, the signal line is not disturbed, and the winding of the power supply cord is performed. And unwinding is smooth and quick (good operability). Further, since the derived signal line can be routed along the interior wall surface such as the ceiling surface without any gap, the aesthetic appearance is improved.

  Since the cord winding portion is formed on the sensor head, the wound power feeding cord is placed on the upper surface of the sensor head when assembled to the mounting base fixed to the ceiling surface. Thus, the assembly operation can be performed without inconvenience that the power feeding cord is unexpectedly dropped or unwound, and the workability is also good.

  Furthermore, the mounting base and the sensor head are structured so that the boss portion provided on the mounting base side is fitted and assembled to the cord winding portion having the rising peripheral wall provided on the sensor head side. In addition, the strength of the coupling portion can be increased as compared with a structure in which the pin member and the hole are simply engaged and assembled.

  And, as the strength is improved, the diameter of the cord winding portion of the sensor head can be reduced, the cord winding space can be expanded, and the length of the power feeding cord can be increased. It is also possible to expect an effect that the external code is not visible from the outside and the appearance is improved. In this case, if the conductive connection portion of the signal line is formed in the fitting connection portion as in claim 2, the conductive connection portion becomes unrelated to the structure in which the sensor head is fixed to the mounting base. There is also an advantage that a reliable conductive connection can be made without force acting.

  In the fire detectors according to claims 3 and 8, since the power feeding cord can be accommodated in the recess of the sensor head, the cord surplus can be concealed so that it cannot be seen from the outside, and the appearance can be improved. There is.

  In the fire detectors according to the fourth and ninth aspects, since the signal line can be arranged around the boss portion, there is an effect that the direction in which the signal line is taken out can be arbitrarily selected according to the construction site situation. In addition, if it is configured as in claims 5 and 10, there is an advantage that the signal line can be taken out in the optimum direction, there is no unnecessary take-out hole, and the aesthetic appearance is improved.

  In addition to the above-described effect of the configuration of claim 3, the fire detector of claim 6 has the convenience of being able to lead out the feeding cord in a suitable direction by having a plurality of knockout holes, and the sensor head. And the mounting base can be assembled without gaps, and there is an advantage that the appearance can be improved without degrading the function.

  In the fire detector of claim 7, since the signal line can be led out from the mounting base, interference with the power supply cord wound around the sensor head is eliminated, and the power supply cord is wound and unwound. Smooth and quick (good operability). In addition, it is possible to route the derived signal line along the indoor wall surface such as the ceiling surface without any gap, and the aesthetics can be improved.

  In addition, since the signal line and power supply cord are not led out from the sensor head, the sensor head can be freely attached to the mounting base regardless of the signal line or power supply cord even after being fixed to the ceiling or side wall. On the other hand, there is an advantage that parts can be easily replaced and maintained. In addition, it is possible to share the detector head in a fire detector of a type that is embedded in a wall such as a ceiling surface (conventional type that is applied at the time of building construction) for this retrofitted type fire detector. There are also benefits

Furthermore, the mounting base and the sensor head have a structure in which a cord winding part having a rising peripheral wall provided on the mounting base side is fitted into a recess provided on the sensor head side, so that the mounting work is also possible. In addition, the strength of the coupling portion can be increased as compared with the structure in which the pin member and the hole are engaged and assembled.
Therefore, it is possible to reduce the diameter of the cord winding portion of the sensor head and expand the cord winding space, and to increase the length of the power feeding cord, or to improve the strength. It is also possible to expect an effect that the appearance can be improved by making the extra code invisible from the outside.

  In the fire detector according to the eighth aspect, since the power feeding cord can be accommodated in the recess of the sensor head, there is an advantage that it is possible to hide the surplus cord so that it cannot be seen from the outside, and the appearance can be improved.

  In addition to the above-described effect of the configuration of claim 8, the fire sensor of claim 11 has the convenience of being able to lead out the feed cord in a suitable direction by having a plurality of knockout holes, and the sensor head. And the mounting base can be assembled without gaps, and there is also an advantage that the appearance can be improved without degrading the function.

  As a sensor according to the present invention, a case of a fire sensor directly attached to a ceiling surface in a building such as a room or a hallway will be described. This fire detector is a simple fire detector that can be installed in a house, etc. without laying a dedicated sensor line. The detector is fixed on the ceiling and the alarm is fixed on the side wall. And a signal line for connecting the sensing body and the alarm unit, and a power supply cord for supplying power from an outlet.

  1 to 5 show a fire detector A having a structure in which a power supply cord 3 is wound around a sensor head 2 and a signal line 4 is taken out from a mounting base 1 along a ceiling surface. 1 is an overall perspective view, FIG. 2 is a side view, FIGS. 3 and 4 are exploded perspective views, and FIG. 5 is an exploded perspective view showing details of the assembly structure. In FIG. 5, the power supply cord 3 is omitted.

  As shown in FIGS. 1 and 2, the fire detector A is attached to a ceiling surface S, and an alarm unit AU in which a signal line 4 led out from the attachment base 1 is attached and fixed to a wall surface W. In order to connect to the cable, the cable is arranged and fixed along the ceiling surface S and the wall surface W. Then, the power supply cord 3 wound around the upper and lower winding portions of the mounting base 1 and the sensor head 2 is unwound and taken out, and the wall W on which the alarm unit AU is mounted, or another In order to insert the power supply plug 3a into an outlet (not shown) provided on a wall or the like, the power supply cord 3 is routed along the ceiling surface S or the wall surface W and fixed.

  The power supply cord 3 to be unwound is only a necessary length, and the rest is placed in a state of being wound around the sensor head 2. In this way, as long as there is an outlet, the fire detector A and the alarm unit AU are fixedly attached to the ceiling surface S and the wall surface W (pipe suspended from the ceiling or other fixed objects), and the power supply cord 3 And the signal line 4 need only be extended and fixed, so that an individual can freely install it later.

Next, the structure of each part will be described.
The fire detector A includes a mounting base 1 fixed to a ceiling surface (an example of a wall surface inside a building) S and a sensor head 2 that is detachably attached to the mounting base 1. A detector 21 for detecting a fire factor is provided at the lower center of the container head 2. Here, the sensing unit 21 can detect various factors such as heat, smoke, flame, and the like that occur when a fire occurs.

  As shown in FIGS. 1 to 5, the mounting base 1 includes a boss portion 12 projecting downward in the center (which constitutes the fitting connection portion 1 </ b> A on the mounting base side), a peripheral wall 1 </ b> B that is an outer wall, and the peripheral wall. It has a substantially annular and recessed wiring accommodating portion 15 formed inscribed in 1B, and engaging recesses 5 formed at three locations in the vicinity of the outer periphery of the boss portion 12. A pair of recessed oval holes 13 c are formed in the tip surface of the boss portion 12, and a conductive connection portion 13 a that is conductively connected to the signal line 4 is disposed inside the boss portion 12. The conductive connection portion 13a is configured by folding a spring plate.

A knockout hole for forming an opening 15a for leading out the signal line 4 to the outside of the peripheral wall 1B of the wiring accommodating portion 15 (a portion that has been previously grooved so that the hole can be easily opened by post-processing. ) 15b is formed at a plurality of locations, one of which is opened to form the opening 15a, from which the signal line 4 is led out. The boss portion 12 is provided with a pair of bolting portions 1e for connecting the signal line 4 to the conductive connection portion 13a.
In addition, 1f of two places is a through hole for screwing the attachment base 1 to the ceiling surface S.

As shown in FIGS. 1 to 5, one sensor head 2 is constituted by a main body case having a two-part structure composed of a first case portion 2 m and a second case portion 2 n. A cylindrical projection with a lower end surface serving as the cord winding portion 22 is formed integrally with the first case portion 2m located on the upper side, and the sensing portion 21 is provided on the lower surface side of the second case portion 2n serving as the lower side. It is detachably attached.
The cord winding portion 22 (which constitutes the fitting connection portion 2A on the sensor head side) is formed to have a diameter that just fits the boss portion 12 of the mounting base 1.

  The sensor head 2 includes a power supply cord 3 provided with a power supply plug 3a to a commercial power source (such as an outlet) at the tip, and the sensing unit 21 configured by a sensor or the like that is powered by the power supply cord 3 to operate. In addition, a pull switch 2a and push switch 2b for controlling the stop of the alarm operation, an alarm buzzer unit 2c, an alarm display unit 2d including a light source, and the like are provided.

  The cord winding portion 22 functions as the fitting connection portion 2A on the sensor head side, and the power feeding cord 3 is wound around the outer periphery of the rising peripheral wall 22b having a recess 22c formed in the center. Yes. In the recess 22c, a pin-like conductive connection portion 23a that is sandwiched and conducted by the conductive connection portion 13a of the mounting base 1 is provided at a corresponding position. A notch 22d for leading the power feeding cord 3 from the inside of the recess 22c to the outside is formed in the rising peripheral wall 22b.

  At the tip (upper end) of the rising peripheral wall 22b, there is an engaging claw 22a for engaging with the engaging portion 5 of the mounting base 1 and locking the mounting base 1 and the sensor head 2 in the assembled state. , And are integrally formed at three locations at corresponding positions. Then, the cord winding part 22 is inserted into the boss part 12 and fitted, and each engaging claw 22a is fitted into the corresponding engaging concave part 5, and then the sensor head 2 is slightly attached to the mounting base 1. It is configured such that both of these 1 and 2 can be fixedly assembled by being pivoted at an angle. When removing, the operations described above may be performed in the reverse order.

  As the sensor head 2 is mounted on the mounting base 1, the pair of conductive connecting portions 13a and 23a are also connected to each other, so that the pin-like conductive connecting portion 23a can be inserted into the hole 13c only. The positional relationship between the engagement claws 22a and the engagement recesses 5 is set so that the engagement claws 22a and the engagement recesses 5 at the three locations can be fitted. When the sensor head 2 is attached to the attachment base 1 and is assembled as the fire detector A, as shown in FIG. A winding accommodating space 6 is formed in which the power feeding cord 3 can be wound and accommodated in a line.

  As described above, in the fire detector A according to the first embodiment, the attachment base 1 and the sensor head 2 are fitted when they are coupled to each other by a rotation operation, and the corresponding conductive connection portions 13a are respectively fitted. , 23a are provided correspondingly. The fitting connection portion 2A provided on the sensor head side (formed on the sensor head 2) has a cord winding portion 22 for winding the power feeding cord 3 around a rising peripheral wall 22b having a recess 22c formed in the center. The fitting connection portion 1A provided on the attachment base side (formed on the attachment base 1) is fitted into the cord winding portion 22 when the sensor head 2 and the attachment base 1 are coupled. A boss portion 12 is formed. The conductive contact 23a and the conductive contact 23a are sandwiched between the electrical recess 23c in the center of the cord winding portion 22 on the sensor head 2 side and the boss portion 12 on the mounting base 1 side. Corresponding conductive connection portions 13a for connection are provided.

In the fire detector A according to the first embodiment,
a. Since the signal line 4 can be led out laterally from the opening 15a formed in the peripheral wall 1B of the mounting base 1, interference with the power supply cord 3 wound around the sensor head 2 is eliminated, and power supply is performed. Winding and unwinding of the cord 3 can be performed smoothly and quickly (with good operability), and the derived signal line 4 can be routed along the surface of the ceiling surface S without any gap (see FIG. 2). In that respect, the aesthetics are also improving.
b. The mounting base and the sensor head 2 are assembled by engaging the engaging claws 22a and the engaging recesses 5 with the cylindrical fitting connection portions 1A and 2A formed integrally with each other. Since the structure is attached, the strength and rigidity of the mounting base 1 and the sensor head 2 itself can be improved and the assembly strength can be improved as compared with the structure in which the pin member and the hole are simply engaged. ing.

c. As the strength is improved, the diameter of the cord winding portion 22 of the sensor head 2 can be reduced to increase the cord winding space, and the length of the power feeding cord 3 can be increased. It is possible to expect the effect that the external code is not visible from the outside and the appearance is improved.
d. Since the cord winding unit 22 is formed on the sensor head 2, the wound power supply cord 3 is placed on the upper surface of the sensor head 2 when assembled to the mounting base 1. Therefore, there is no inconvenience that the power supply cord 3 is unexpectedly dropped or unwound, the assembly operation can be performed, and the workability is good.

  The fire detector B shown in FIGS. 6 and 7 has a structure in which the power supply cord 3 is led out from the mounting base 1 and wound, and the signal line 4 is taken out from the mounting base 1 along the ceiling surface. Yes, when the sensor head 2 is removed from the mounting base 1, the conduction of the signal line 4 and the power feeding cord 3 is interrupted. Hereinafter, the description of the structure of the fire detector B according to the second embodiment will be made mainly on portions different from the fire detector A of the first embodiment.

  The fire detector B has a structure in which the power supply cord 3 is led out from the mounting base 1 in addition to the signal line 4. For this purpose, the power supply cable connecting portions 13 b and 23 b for the power supply cord 3 are connected to the lower end surface of the mounting base 1. The cylindrical fitting connection portion 1B and the recess 22c of the sensor head 2 are distributed and arranged. The feeding cord 3 is led out from the take-out hole 9 formed in the rising peripheral wall 14b of the boss portion 12 of the mounting base 1, and the fitting connection portion 1B is a cord for winding the feeding cord 3 around the rising peripheral wall 14b. A winding unit 14 is formed.

  The connection part 13b for the power supply cord 3 provided on the mounting base 1 is the same component as the connection part 13a for the signal line 4, and is within the single hole 13d recessed in the fitting connection part 1B. A pair is arranged in the back. The connection portion 23 b for the power feeding cord 3 provided in the sensor head 2 is a pin-like component similar to the connection portion 23 a for the signal line 4 and is erected in the recess 24. In addition, the engaging claws 7 for attaching the sensor head 2 are integrally formed at three positions of the tip (lower end) of the cord winding portion 14, and the recess 24 of the sensor head 2 has these engagements. A total of three engaging recesses 8 that engage with the claws 7 are formed at corresponding positions.

  Thus, in order to assemble the sensor head 2 to the mounting base 1 fixed to the ceiling surface S, with the four pin-like connecting portions 23a and 23b inserted into the corresponding holes 13b and 13d, The fitting connection portion 2B of the sensor head 2 is externally fitted to the fitting connection portion 1B of the mounting base 1 with the engagement recess 8 corresponding to the engagement claw 7, and the sensor head 2 is attached to the mounting base 1. The two and 1 and 2 can be locked and fixed and assembled by slightly rotating with respect to the angle. In the assembled state, a winding accommodation space is formed between the upper and lower sides of the sensor head 2 and the mounting base 1 on the outer peripheral side of the cord winding portion 14 so that the power feeding cord 3 can be wound and accommodated in a row. (Refer to reference numeral 6 in FIG. 2) The point is the same as in the first embodiment.

  As the sensor head 2 is assembled to the mounting base 1, all the four connection portions 13 a, 23 a, 13 b, and 23 b of the power supply cord 3 and the signal line 4 are conductively connected. It has become. When the sensor head is removed from the mounting base 1, the operations just described may be performed in the reverse order.

  As described above, in the fire detector B of the second embodiment, the mounting base 1 leads out the signal line 4 for sending the detection signal to the separately installed alarm unit AU and has the power supply plug 3a at the tip. And the attachment base 1 and the sensor head 2 are fitted when they are coupled to each other by a rotating operation, and corresponding signal line connecting portions 13a, 23a, The fitting connection portions 1B and 2B having the feeder connection portions 13b and 23b are provided correspondingly.

  The fitting connection portion 1B provided on the attachment base side (formed on the attachment base 1) forms a cord winding portion 14 having a rising peripheral wall 14b around which the power feeding cord 3 is wound, and the sensor head The fitting connection 2 </ b> B provided on the side (formed on the sensor head 2) is configured by forming a recess 24 in the center of the sensor head 2. Further, the cord winding part 14 (formed on the mounting base 1) on the attachment base side, and the recess 24 (formed on the sensor head 2) on the sensor head side to be fitted into the cord winding part 14 And the conductive contact portions 23a and 23b forming the signal line connection portions 13a and 23a and the feed line connection portions 13b and 23b, and the conductive connection portion 13a that sandwiches the conductive contact portions 23a and 23b to make an electrical connection. , 13b are provided in correspondence with each other.

In the fire detector B according to the second embodiment, the a. Described in the paragraph numbers “0049” and “0050” are described. ~ C. And the following e. Or f. There are also the following effects.
That is, e. Since no signal line or power supply cord is led out from the sensor head 2, the sensor head can be freely connected regardless of the signal line 4 or the power supply cord 3 even after being fixed to the ceiling surface S or the side wall SW. 2 can be attached to and detached from the mounting base 1, and there is an advantage that parts can be easily replaced and maintained.
In addition, f. It is possible to share the sensor head in a fire detector A that is embedded in a wall such as a ceiling surface (conventional type that is installed at the same time when building a building) with this retrofitted type fire detector A.

In the fire detector A of the first embodiment shown in FIGS. 1 to 5, a hollow recess 25 is formed on the outer periphery of the cord winding portion 22 on the upper surface side of the detector head 2 as indicated by a virtual line in FIG. A fire detector B that is formed and configured in a power feeding cord housing portion that houses the power feeding cord 3 is also possible.
In this case, it is convenient that a plurality of knockout holes 25a for forming openings for leading the power supply cord 3 to the outside are formed on the outer peripheral wall of the power supply cord accommodating portion 25 of the sensor head 2. is there.

  In the fire detector A according to the configuration of the third embodiment, the power supply cord 3 can be accommodated in the recess 25, so that the excess cord can be prevented from being seen from the outside. Further, the cord housing space 6 (see FIG. 2) is not provided between the sensor head 2 and the mounting base 1 and can be assembled without any gap, and the appearance can be improved without degrading the function. There are advantages. Further, since there are a plurality of knockout holes 25a, there is an advantage that the power supply cord 3 can be led out in a suitable direction.

  In the fire detector B of the second embodiment shown in FIGS. 6 and 7, the sensor head 2 is disposed around the outer periphery of the cord winding portion 14 of the mounting base 1 at the time of assembly, as indicated by a virtual line in FIG. A hollow recess may be formed at a corresponding location to configure the power supply cord accommodating portion 25 that accommodates the power supply cord 3. Further, it is advantageous that a plurality of knockout holes 25a for forming openings for leading the power supply cord 3 to the outside are formed on the outer peripheral wall of the power supply cord accommodating portion 25 of the sensor head 2. .

  In the fire detector B having the configuration of the fourth embodiment, the power supply cord 3 can be accommodated in the recess 25, so that the excess cord can be prevented from being seen from the outside. Then, the sensor head 2 and the mounting base 1 can be assembled without a gap without providing a cord housing space 6 (see FIG. 2) between them, and the appearance can be improved without degrading the function. There are advantages that are possible. Further, since there are a plurality of knockout holes 25a, there is an advantage that the power supply cord 3 can be led out in a suitable direction.

  The fire detector A according to the present invention can be used as a wall-mounted type attached to the wall surface W, and when it is indoor wall such as a ceiling surface, that is, when the ceiling surface is high, the pipe is arranged below the ceiling surface. It can be attached to a structure such as an air conditioner or the like.

The perspective view which shows one Example of the fire detector by this invention (The state seen from the lower part is shown) Side view of fire detector mounted on the ceiling A perspective view showing a state in which the sensor head and the mounting base are separated (shown from below). A perspective view showing a state in which the sensor head and the mounting base are separated (shown from above). An exploded perspective view showing a coupling structure between the sensor head and the mounting base The exploded perspective view of the fire detector of another structure of the present invention FIG. 7 shows the fire sensor of FIG. 6, (a) is a bottom view of the mounting base, and (b) is a plan view of the sensor head. Side view showing a conventional fire detector 8 is a perspective view showing a state in which the conventional sensor head and the mounting base are separated from each other in the fire sensor of FIG. 8 (showing a state viewed from below). FIG. 8 is a perspective view showing a state in which the detector head and the mounting base are separated from each other in the fire detector of FIG. 8 (showing a state viewed from above).

Explanation of symbols

A, B Fire detector 1 of the present invention Mounting base 2 Sensor head 1A, 2A Fitting connection 1B, 2B Fitting connection 3 Feeding cord 3a Feeding plug 4 Signal line 12 Boss 13a, 23a Signal line connection 13b , 23b Feed line connecting portion 13c Hole portion 14 Cord winding portion 15 Wiring housing portion 15b Knockout hole portion 22 Cord winding portion 22b Standing peripheral wall 22c, 24 Recess 25 Feeding cord housing portion 25a Knockout hole portions A and B Fire detector AU alarm unit S Ceiling surface W Wall surface

Claims (11)

In a fire detector comprising a mounting base that is attached to an indoor wall such as a ceiling surface, and a sensor head that can be assembled to the mounting base by providing a sensor for detecting a fire factor,
The sensor head derives a power supply cord having a power supply plug at the tip,
The mounting base leads out a signal line for sending a detection signal to a separately installed alarm unit;
The mounting base and the sensor head are provided correspondingly with fitting connection portions having signal line connection portions corresponding to each other, which are fitted when they are coupled to each other by a rotation operation,
The fitting connection portion provided on the sensor head side has a cord winding portion for winding the power feeding cord on a rising peripheral wall having a recess formed in the center,
The fitting connection portion provided on the mounting base side forms a boss portion that is fitted into the cord winding portion when the sensor head and the mounting base are coupled.
A conductive contact and a conductive connecting portion that is electrically connected by sandwiching the conductive contact between the central recess of the cord winding portion on the sensor head side and the boss portion on the mounting base side Fire detectors that are provided in correspondence . In claim 1,
A hole is formed in the boss portion on the mounting base side, and the conductive connection portion is provided inside the hole,
A fire sensor provided with a conductive contact in a central recess of a cord winding portion of the sensor head. In claim 1,
The sensor head is a fire detector that forms a hollow recess in the outer periphery of the cord winding portion to constitute a power feeding cord housing portion that houses the power feeding cord. In any one of Claims 1-3,
The mounting base is a fire detector in which a wiring accommodating portion for accommodating the signal line is recessed in the outer periphery of the boss portion. In claim 4,
A fire detector, wherein a plurality of knockout holes for forming an opening for leading the signal line to the outside are formed on a peripheral wall of the wiring housing part. In claim 3,
A fire sensor, wherein a plurality of knockout holes for forming an opening for leading the power supply cord to the outside are formed on an outer peripheral wall of the power supply cord housing portion of the sensor head. In a fire detector comprising a mounting base that is attached to an indoor wall such as a ceiling surface, and a sensor head that can be assembled to the mounting base by providing a sensor for detecting a fire factor,
The mounting base has a signal line for sending a detection signal to a separately installed alarm unit, and leads a power supply cord having a power supply plug at the tip,
The mounting base and the sensor head correspond to a fitting connection portion having a corresponding signal line connection portion and a feeding line connection portion that are fitted when they are coupled to each other by a rotation operation. Provided,
The fitting connection portion provided on the mounting base side forms a cord winding portion having a rising peripheral wall around which the power feeding cord is wound,
The fitting connection provided on the sensor head side is configured by forming a recess in the center of the sensor head,
The cord winding portion on the mounting base side and the recess on the sensor head side inserted into the cord winding portion include the signal line connecting portion and the power feeding line connecting portion, and a conductive contact. A fire detector provided with a corresponding conductive connecting portion sandwiching the conductive contact and making electrical connection . In claim 7,
The sensor head is a fire detector that forms a hollow recess in the outer periphery of the recess and constitutes a power supply cord accommodating portion that accommodates the power supply cord. In claim 7 or claim 8,
The mounting base is a fire detector in which a wiring accommodating portion for accommodating the signal line is recessed in the outer periphery of the cord winding portion. In claim 9,
A fire detector, wherein a plurality of knockout holes for forming an opening for leading the signal line to the outside are formed on a peripheral wall of the wiring housing part. In claim 8,
A fire sensor, wherein a plurality of knockout holes for forming an opening for leading the power supply cord to the outside are formed on an outer peripheral wall of the power supply cord housing portion of the sensor head.

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