JP4253757B2 - Fire detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
Generally, when a fire breaks out in a building with this type of fire detector installed, the fire detection unit inside the main unit operates via a sensing element that detects the heat and smoke of the fire, and the confirmation lamp is automatically turned on. The operation status of the fire detector is displayed. In addition, in some fire detectors, when the switch is turned on with an inspection push button or drawstring, the fire detection unit operates in a simulated manner and the above-mentioned confirmation lamp lights up or the buzzer sounds to detect fire. Some fire detectors are configured for home use so that the normal operating condition of the instrument can be checked.
The present invention relates to a fire detector, and more particularly to a fire detector provided with a confirmation light as described above.
[0002]
[Prior art]
FIG. 6 (a) shows a conventional fire detector equipped with a confirmation indicator as described above, and a drawing described in Japanese Utility Model Publication No. 61-1511 is shown. In FIG. 6A, reference numeral 101 denotes a main body of a sensor made of synthetic resin and appropriately attached and fixed to a ceiling portion or the like. Reference numeral 102 denotes a protective cover that can be attached to and detached from the main body 101 by rotation, 103 is an operation display circuit block, 104 is an operation indicator lamp, and 108 is a light guide. Thus, when a fire occurs and the fire detection unit (not shown) detects the released heat, smoke, flame, etc., the operation indicator light 104 is turned on, and this light is transmitted to the light guide 108 through the space, and It is configured so that it can be easily confirmed from the outside. Further, the explanation is made that “the sensor main body and the protective cover can be completely separated and maintained. The sensor body can be easily cleaned and the workability is improved.
[0003]
FIG. 6B shows a conventional fire detector (electrical device) having a configuration in which the operation state can be checked by the aforementioned switch operation for inspection, and a drawing described in Japanese Utility Model Laid-Open No. 56-18633 is shown. . In FIG. 6B, 201 is a device case, 203 is an operation check switch, 203a is a push button, and 204 is a drawstring. Reference numeral 206 denotes a printed circuit board, and 208 denotes a lever protruding from the inner wall. A pull string 204 is attached to the tip of the lever 208 and is pulled out from the hole of the case 201 and suspended. A buzzer 202 and a circuit for a fire detection unit are mounted on the printed circuit board 206. Then, when the pulling string 204 suspended from the case 201 is pulled, the push button 203a is pressed to turn on the switch 203, and the buzzer 202 sounds to check whether the fire detector is operating normally. .
[0004]
[Problems to be solved by the invention]
In the fire detector shown in FIG. 6A, the tip of the light guide 108 is exposed in the middle of the inclined surface of the protective cover 102 protruding from the center, as shown in the figure. For this reason, when the light of the light guide 108 is blocked by the central protrusion of the protective cover 102 and the sensor is viewed from the opposite side (left side in the figure), it is not possible to confirm the sensing operation of the sensor. It becomes possible. On the other hand, in FIG. 6B, the lever 208 is integrally formed with the case 201 so as to be parallel to the bottom wall. Then, after the lever 208 is indirectly displaced by the pull string 204, the push button 203a is pressed to operate the operation check switch 203. Therefore, both of the above-described conventional devices have some problems, such as the production of the relative position between the switch 203 and the lever 208 takes time, and the adjustment becomes cumbersome and the cost is increased.
[0005]
On the other hand, as described above, the housing of the fire detector is made of a disc-shaped synthetic resin having a dense surface, and thus is easy to slide. Therefore, when the main body is grasped with one hand, the finger may slip and drop on the floor surface. If the dropped floor is hard, the sensing element may be damaged or the housing may be disassembled.
[0006]
The present invention has been made to solve the problems of conventional fire detector as described above, almost directly manipulated to configure the switch for confirmation operation with a faster response by simplifying It is intended to realize a fire detector that can be easily attached to and detached from a ceiling surface and is safe.
[0007]
[Means for Solving the Problems]
The present invention relates to a fire detector having a housing including a main body that houses a fire detection unit and a protective cover coupled to a lower portion of the main body, and a switch for checking the fire detection unit is provided inside the main body. Provided on the printed circuit board on which the switch for inspection is provided is provided with a confirmation light that lights up or flashes when the switch for inspection is pressed, and a rib that is in contact with the push button that pushes the switch for inspection is provided around the confirmation light , connect the cord pulling the push button to press the switch for inspection, which is constituted of the fire detector which draw out the drawstring from the housing.
In addition, the present invention provides a fire detector having a casing including a main body that houses a fire detection unit inside and a protective cover coupled to a lower portion of the main body. A switch is provided, and a push button that pushes the switch for inspection is provided. The push button is molded into a reverse cap shape, a flange portion is formed on the outer periphery, and a pull string is formed on an extension portion formed on a part of the flange portion. The fire detectors are connected so that the drawstring is pulled out of the housing .
Et al is, the present invention is to constitute a fire detector having a finger rest for non-slip outer periphery of the housing.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
FIGS. 1A and 1B are configuration explanatory views of Embodiment 1 of the present invention, where FIG. 1A is a side sectional view, FIG. 1B is a bottom view, and FIG. 2 is an operation explanatory view of a switch mechanism. In the embodiment of the present invention, different names and symbols are used even in the structural members corresponding to the conventional ones.
1 and 2, reference numeral 1 denotes a sensor housing. The housing 1 is molded with a smooth and smooth resin material. Reference numeral 2 denotes a main body, 3 denotes a protective cover coupled to the lower portion of the main body 1, and the main body 2 and the protective cover 3 constitute a housing 1. Reference numeral 20 denotes a printed circuit board disposed in the horizontal direction inside the main body 2, and 21 denotes an optical table attached to the printed circuit board 20 by a locking piece 22. 23 is a pair of left and right confirmation lights that are turned on when the fire detection unit detects a fire. At this time, the projection light of the confirmation lamp 23 is projected onto a light guide described later. The optical bench 21 forms a dark box capable of airflow, and is provided with a light projecting element and a light receiving element (both not shown) that sense smoke.
[0009]
Reference numeral 4 denotes an inspection switch mechanism for confirming the operation of the fire detection unit. 40 is a switch body in the switch mechanism 4, 41 is a key top, 42 is a push button, and 43 is a drawstring. The push button 42 is formed in a double-cylinder shape having an insertion hole 44 in the center and is formed into an inverted cap shape, and can be fitted to the key top 41 through the insertion hole 44. The push button 42 is formed with a flange portion 45 on the outer periphery of the upper end, and an attachment hole 46 for connecting the pull string 43 to a partial extension portion of the flange portion 45 is formed. A hard resin is used for the push button 42 as in the case 1 and the like, but a soft resin having flexibility is used for the key top 41. In addition, although not shown in the drawing, electronic components such as resistors, capacitors, and ICs are mounted on the printed circuit board 20. These electronic components, the optical bench 21 and the like constitute a fire detection unit and are accommodated in the main body 2.
[0010]
Reference numeral 31 denotes a disk-shaped protection plate, 32 denotes a radial support column that supports the protection plate 31, 33 denotes a ventilation path formed between the support columns 32, and 34 denotes an acoustic hole. The protective plate 31 is provided at the bottom of the dish-shaped protective cover 3 and covers the outside of the optical bench 21 to protect it from external forces and the like. 35 is a button hole in which the push button 42 is exposed, and 36 is an annular (ring-shaped) light guide, which lights up over the entire circumference of the ring when the confirmation lamp 23 is turned on and irradiated. Reference numeral 37 denotes a rib of the push button 42 (see FIG. 2). The light guide 36 is made of a translucent belt-like resin material such as acrylic resin. The light guide 36 is provided on the inclined surface of the protective cover 3, more specifically, on the surface of the outer peripheral portion of the optical bench 21, and a part on the inner surface side approaches the left and right confirmation lamps 23 as shown in the figure. Reference numeral 11 denotes a key-shaped mounting bracket projecting from the upper portion of the main body 2, and a fire detector is mounted on a base that also serves as a connection terminal and is fixed to the ceiling surface.
[0011]
FIG. 3 is a cross-sectional view showing details of the light guide 36. As described above, the light guide 36 receives the projection light when the confirmation lamp 23 is lit, and the entire surface of the light guide 36 emits light. In this way, there is a method as shown in FIG. 3 for causing the entire light guide 36 to emit light. That is, in FIG. 3, the bottom surface of the light guide 36 is formed in a jagged manner like a saw blade. By using a side light emitting LED as the confirmation lamp 23 and irradiating the bottom surface of the light guide 36 from the lateral direction, the entire surface of the light guide 36 can be made to emit light. Alternatively, by blasting the bottom surface of the light guide 36 and forming it like polished glass, the projection light of the confirmation lamp 23 may be diffused to emit light as a whole. In this case, a recess for allowing the confirmation lamp 23 to face may be provided in a part on the bottom side of the light guide 36.
[0012]
When a fire occurs and smoke enters the optical bench 21 through the air passage 33 between the columns 32 of the protective cover 3, scattered light between the light projecting element and the light receiving element is increased by the smoke. When the amount of light received by the light receiving element reaches a certain value, a fire is determined, a buzzer (not shown) sounds, and the confirmation lamp 23 lights or blinks. In this case, as described above, according to the first embodiment, the ring-shaped light guide 36 is provided close to the confirmation lamp 23 that is turned on when a fire occurs. For this reason, the projection light of the confirmation lamp 23 irradiates the light guide 36, the lighting light of the confirmation lamp 23 is transmitted through the inside, and the ring-shaped light guide 36 emits light to illuminate the vicinity. In this way, the fire detector that has acted in response to the occurrence of a fire can be confirmed from any direction by the light guide 36 that emits light on the entire peripheral surface of the protective cover 3.
[0013]
Next, the inspection operation of the fire detection unit as described above will be described with reference to FIG.
2A and 2B are operation explanatory views of the switch mechanism of the first embodiment. FIG. 2A is an operation explanatory view of a push button, and FIGS. 2B, 2C, and 2D are operation explanatory views of a drawstring. In the normal state, the push button 42 is held horizontally without being inclined by receiving the spring pressure of the switch body 40 as shown in FIG. At this time, one end (right end) of the flange 45 is slightly separated from the rib 37 of the protective cover 3. Therefore, when the operating state of the switch mechanism 4 is checked by the push button 42, the bottom of the push button 42 exposed from the button hole 35 is pushed vertically upward. When the bottom part is pushed up as shown by the arrow, the push button 42 is lifted integrally in the vertical direction as it is along the key top 41, and the switch body 40 is turned on to check whether the fire detection part operates normally (inspection). Then, the confirmation lamp 23 is turned on or blinks. When the finger is released from the push button 42, the push button 42 is vertically lowered and restored by the spring pressure.
[0014]
Further, when the pull string 43 is used, the tip of the pull string 43 pulled out from the housing 1 is pulled down as shown in FIG. Initially, as shown in FIG. 2A, when the push button 42 held in a horizontal state starts to pull the pull string 43, the extension portion provided with the attachment hole 46 is pulled, and the push button 42 is left with the center axis as a fulcrum. Tilt up. At the same time, as shown in FIG. 2D, the inclination angle θ between the vertical surface inside the main body 2 and the drawstring 43 increases to θ1 to θ2 following the inclination of the push button 42. When the pull string 43 is further pulled, the push button 42 increases the inclination while deforming the flexible key top 41, and one end (right end) of the flange portion 45 contacts the rib 37 of the protective cover 3. Then, the pivot point of the push button 42 is moved from the central axis to the contact point O with the rib 37 and tilted while rotating the push button 42 with the enlarged rotation radius r as shown by the dotted line in FIG. I will let you.
[0015]
When the vertical displacement associated with the inclination of the push button 42 reaches a certain value, the confirmation lamp 23 is lit or blinked in the same manner as when the switch body 40 is turned on and the push button 42 is pushed up. As described above, according to the present invention, the pull string 43 is directly connected to the push button 42 formed in the reverse cap shape, and the vertical direction of the push button 42 with respect to the movement amount of the pull string 43 using the push button 42. The switch body 40 is turned on by increasing the amount of displacement. As a result, the response operation of the switch mechanism 4 becomes faster, and the ON / OFF operation of the switch body 40 can be improved. By providing the rib 37 in this manner, the inclination of the push button 42 can be limited as compared with the case where the rib 37 is not provided, so that an excessive force can be prevented from being applied to the switch body 40.
[0016]
Embodiment 2
4A and 4B are configuration explanatory views of Embodiment 2 of the present invention, in which FIG. 4A is a side sectional view and FIG. 4B is a bottom view. In the second embodiment, a thermistor 24 that thermally senses the occurrence of a fire is used as a fire sensing element. In addition, a skeleton-like protector 30 that is a part of the protective cover 3 is provided as a component for protecting the small sensing element 24. The protector 30 includes a ring-shaped base 30a, a plurality of radial legs 30b, and a top 30c that is provided at the tip of the leg 30b and has a smaller diameter than the base 30a. A plurality of claw portions are provided radially in the top portion 30c. Further, a protrusion or a locking piece is provided on the lower surface of the base 30a. As described above, the protector 30 is formed separately from the housing 1 and is attached to the central portion of the housing 1 using the above-described protrusions or locking pieces. In particular, in the second embodiment, the protector 30 is made of a light-transmitting resin material such as an acrylic resin, like the light guide 36 of the first embodiment, so that the sensing element 24 is protected and light-transmitted. It is configured to perform one function. In addition, since the configuration and operation of the confirmation lamp 23 and the switch mechanism 4 are the same as those in the first embodiment, the re-explanation is omitted. The confirmation lamp 23 is provided close to the inside of the base 30a of the protector 30. According to the second embodiment, since the three-dimensional structure protector 30 receives the projection light emitted from the confirmation lamp 23 that is lit, the operation state of the sensor can be confirmed more accurately. In the second embodiment, the switch mechanism 4 operates in the same manner.
[0017]
Embodiment 3
FIG. 5 is an explanatory diagram of the configuration of the third embodiment of the present invention. The upper and lower parts of FIGS. 5A, 5B, and 5C are a side view and a bottom view of the housing 1, respectively. FIG. 5 shows a drawing connected to a base 5 fixed to a ceiling or the like using an optical bench 21 as a sensing element as in FIG. As described above, the casing 1 of an ordinary fire detector is made of a synthetic resin whose surface is dense and slippery. Thus, in the third embodiment, the structure shown in FIGS. 5A to 5C is employed. That is, in FIG. 5 (a), arc-shaped finger stop holes 61 are formed at four positions on the outer periphery of the connecting portion between the main body 2 and the protective cover 3. 5B, a square groove 62 is formed in the protective cover 3, and a linear protrusion 63 is formed on the outer periphery of the main body 2 in FIG. 5 (a) to 5 (c), an anti-slip finger hook 6 (6 is a generic name) such as an arc-shaped finger hook hole 61 is provided on the outer periphery of the housing 1, so that the finger can be easily configured. Slip can be effectively prevented. By providing such a finger hook 6, when the housing 1 is rotated to the base 5 and attached or removed, the rotating operation can be performed without slipping. Moreover, you may make it provide an appropriate quantity partly or entirely in the outer periphery of the main body 2 as a finger hook 6 according to necessity for a dimple or a small protrusion.
[0018]
In each of the above-described embodiments of the present invention, the case where the confirmation lamps are a pair of left and right is described as an example, but the number of confirmation lamps may be increased or decreased as appropriate. In the case of the third embodiment, the present invention can also be applied to a case where a sound such as a buzzer or a notification is emitted instead of the confirmation lamp that displays the operation state of the fire detector. Furthermore, although three types of finger hooks such as arcs and squares are shown in the third embodiment, the present invention is not necessarily limited to these examples, and the same functions and effects are achieved even with respect to the structure of the light guide and the switch mechanism. As long as it can be appropriately changed to another configuration.
[0019]
【The invention's effect】
The present invention relates to a fire detector having a housing including a main body that houses a fire detection unit and a protective cover coupled to a lower portion of the main body, and a switch for checking the fire detection unit is provided inside the main body. Provided on the printed circuit board on which the switch for inspection is provided is provided with a confirmation light that lights up or flashes when the switch for inspection is pressed, and a rib that is in contact with the push button that pushes the switch for inspection is provided around the confirmation light , connect the cord pulling the push button to press the switch for inspections were constructed the fire detector pull out the pull cord from the housing.
In addition, the present invention provides a fire detector having a casing including a main body that houses a fire detection unit inside and a protective cover coupled to a lower portion of the main body. A switch is provided, and a push button that pushes the switch for inspection is provided. The push button is molded into a reverse cap shape, a flange portion is formed on the outer periphery, and a pull string is formed on an extension portion formed on a part of the flange portion. Connected to form a fire detector in which a drawstring is pulled out of the housing .
Et al is, the present invention is to constitute a fire detector having a finger rest for non-slip outer periphery of the housing.
[0020]
As a result, according to the present invention, the substantially directly operate to configure the switch for confirmation operation with a faster response to simplify its upper safe fire easy installation and removal of the ceiling surface A sensor can be provided.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a configuration of a first embodiment of the present invention.
FIG. 2 is an operation explanatory diagram of the switch mechanism of the first embodiment.
FIG. 3 is a cross-sectional view showing details of a light guide.
FIG. 4 is an explanatory diagram of a configuration of a second embodiment of the present invention.
FIG. 5 is an explanatory diagram of a configuration of a third embodiment of the present invention.
FIG. 6 is a cross-sectional view of a conventional sensor.
[Explanation of symbols]
1 housing, 2 body, 3 protective cover,
4 switch mechanism, 5 base, 6 finger rest,
11 Mounting bracket,
20 printed circuit boards, 21 optical benches, 22 locking pieces,
23 confirmation light,
30 protector, 30a base, 30b leg,
30c top,
31 protection plate, 32 struts, 33 air passage,
34 acoustic holes, 35 button holes, 36 light guides,
37 ribs,
40 switch body, 41 key top, 42 push button,
43 drawstring, 44 insertion hole, 45 flange,
46 mounting holes,
61 finger holes, 62 square grooves, 63 linear protrusions,

Claims (3)

In a fire detector comprising a housing composed of a main body that houses a fire detection unit inside, and a protective cover coupled to the lower part of the main body,
Provide a switch for inspection of the fire detection unit inside the body,
On the printed circuit board on which the inspection switch is provided, a confirmation light that is lit or blinks when the inspection switch is pressed,
Provided around the confirmation lamp is a rib that contacts a push button that pushes the switch for inspection,
Fire detector, characterized in that to connect the cord pulling the push button to press the switch for the inspection, and pull out the string-out the cited from the housing. In a fire detector comprising a housing composed of a main body that houses a fire detection unit inside, and a protective cover coupled to the lower part of the main body,
Provide a switch for inspection of the fire detection unit inside the body,
Provide a push button to push the switch for inspection ,
The push button is molded into a reverse cap shape, and a flange portion is formed on the outer periphery.
A fire sensor, wherein a pull string is connected to an extension formed at a part of the flange, and the pull string is pulled out from the housing. The fire detector according to claim 1 or 2, wherein an anti-slip finger hook is provided on an outer periphery of the casing.

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