JP2007122414A - Fire alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire alarm operation piece (alarm stop button) configured of a small number of parts for easy assembly and provided with a large-shaped pressing operation part for easy operation. <P>SOLUTION: A support plate 7 having a long plate shape is arranged along the long side direction of the substantially arc-shaped operation piece 1. In a cover 2 and a body 3 of the fire alarm, engagement pieces 24a and 24b and support pieces 9a and 9b for supporting (holding) the support plate 7 are arranged in the positions supporting the vicinities of the both ends of the support plate 7. In the vicinities of the both ends of the support plate 7, engagement holes 6a and 6b are arranged, and when the engagement holes 6a and 6b are engaged around the engagement pieces 24a and 24b, the operation piece 1 is attached to the cover 2. When the cover 2 and the body 3 are fitted together, the support plate 7 attached to the cover is pressed further to be supported and fixed by means of the engagement pieces 24a and 24b and the support pieces 9a and 9b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of a fire alarm installed in a house or the like.

  2. Description of the Related Art Conventionally, fire alarms and gas alarms that detect fire and gas and give an alarm are well known.

  In a residential fire alarm device, when power is supplied by a battery or a commercial power source and smoke or heat is detected, an alarm is given to the effect that a fire has occurred by a buzzer or sound.

  Fire alarms are installed on the ceilings and walls of houses and are extremely useful in the event of a fire. However, since the frequency of its use is low, it is preferable to form it in a small and thin shape so as not to impair the aesthetic appearance of the room (downsizing / thinning).

By the way, since these fire alarms need to be regularly tested to see if they can perform a normal alarm when a fire is detected, an operation piece as a test means is placed on the surface of the alarm. (Also called alarm stop button, test button or test switch).
By pushing this operation piece (pushing operation), or pulling the switch pull string that is connected to the operation piece in advance inside the fire alarm and extended to the outside of the fire alarm, By interlocking, the operation piece (alarm stop button) is moved (displaced), an electronic switch part (hereinafter referred to as a switch) built in the fire alarm is turned on, and an alarm is emitted. Further, by operating this operation piece (test button) again, the switch in the alarm device is turned off and the alarm can be stopped.
For the sake of explanation, a button part (also called an alarm stop button) that is placed on the surface of the alarm device and that is operated by pushing with a finger is called an operation piece, and an electronic switch component connected to the circuit board in the alarm device is a switch. I will call it.

  It is known that the operation piece mounting mechanism is provided integrally or separately on the detection unit side of the alarm device. The operation piece is displaced in accordance with the pushing operation, and it is necessary to press the switch in the fire alarm to be surely turned on / off. Since it is necessary to return to the position, the operation piece is elastic and has a flexible structure.

In the case where the operation piece is separately provided on the detection unit side of the alarm device cover, various switch mechanisms have been conventionally used. For example, a spring is provided inside the operation piece (alarm stop button) to provide a biasing force. There was something to give.
However, in such a case, since the number of parts is increased, there is a problem that the assembly is complicated and the cost is increased (prior art of Patent Document 1, Patent Document 2).
Japanese Patent Laid-Open No. 2003-162779 JP-A-7-296278

On the other hand, when a spring or the like is not used, a plate-like or bar-like extension (from the operation piece) (regardless of whether the operation piece is integrated with or separate from the fire alarm cover) Hereinafter, there is a mechanism in which an arm portion is provided, a part of the arm portion is supported, and the operation piece can be repeatedly pushed. These mechanisms are known (Patent Document 1).
At this time, the vicinity of the fulcrum of the arm portion is curved, or the thickness is made thin (thin) to give elasticity or deflection.

Conventionally, a switch (electronic switch component) built in a fire alarm has generally used one relatively small switch due to the problem of storage space. It was enough to fulfill. The operation piece (alarm stop button) also has a shape that matches the shape of the switch, resulting in a relatively small shape.
Also in this case, it is sufficient as a mechanism of the operation piece if the arm portion is formed as a relatively thin rod-like member according to the (small) shape of the operation piece and is provided so as to extend from the operation piece to have a cantilever support structure. Met.

However, in recent years, from the viewpoint of improving operability, there is a tendency for the operation piece to have a large shape.
Here, “large shape” means that a human has a sufficiently large area for a push operation with a finger, and the larger the area, the better the push operability.
However, as described above, it has been very difficult in terms of structure to satisfy the requirements for reducing the size and thickness of the fire alarm and to make the operation piece large.

  Specifically, in order to ensure that the switch is turned ON / OFF regardless of which part of the operation piece is pushed by making the operation piece large, it is possible to incorporate a plurality of switches in the fire alarm. It is done. However, in this case, as described above, there is a problem in terms of storage, and there is a problem that costs increase.

  Further, in order to reliably transmit the force for turning on / off the switch to any one switch regardless of which part of the large-sized operation piece is pushed, for example, at a plurality of locations of the large operation piece, In addition, a long arm part is provided, and a mounting and holding part is provided in a limited range of the fire alarm cover according to the number and shape of the arm part. Can be considered. However, depending on the shape of the operation piece, most of the space for storing the mounting holding part and the arm part is allocated to the limited range of the cover, and it becomes necessary to make the operation piece smaller. There has been a problem that the demand for making the piece into a large shape cannot be sufficiently satisfied.

Furthermore, when the arm portion is provided, as described above, the thickness of the arm portion is thinned (thinned) in order to provide elastic flexibility in the vicinity of the fulcrum of the arm portion. A slight variation occurs in the shape, and vibration (bends) many times due to repeated operation piece pushing operations, so that deterioration and distortion occur. Further, when the wall thickness is thinly molded and the structure is curved, the variation becomes more prominent.
That is, variations and distortions in the parts of these arm parts greatly affect when the operation piece is attached to the cover, and the arrangement state of the operation piece (the state of the operation piece before the pushing operation or the stringing operation and the operation piece) There was a variation in the appearance of the surroundings, and the appearance of the fire alarm differed from one fire alarm to another.

  In this way, the shape of the operation piece is increased without using any parts other than one switch and the operation piece, and without increasing the number of assembly steps other than the assembly process for attaching the operation piece to the cover. Even if the part is pushed, a technique for reliably turning on / off the switch has not been established.

  Therefore, the present invention is a fire alarm device which is reduced in size and thickness as described above and has an operation piece separately, and does not use a single switch and parts other than the operation piece, and uses the operation piece as a cover. It is possible to increase the shape of the operation piece without increasing the number of assembly processes other than the assembly process to be attached, and to reliably turn the switch ON / OFF by pushing any part of the operation piece. Furthermore, even if the shape near the fulcrum of the arm portion varies slightly for each part due to molding, the arrangement state of the operation piece (the state of the operation piece before the push operation or the string pulling operation and around the operation piece) The purpose is to provide a fire alarm that unifies the appearance of each fire alarm device.

  In order to solve the above problems, a fire alarm according to claim 1 of the present invention includes a body, a cover, and an operation piece that forms a part of the cover and is operated to be pushed or pulled. A fire alarm device having a built-in switch that is turned ON / OFF by a pushing operation or a stringing operation of the operation piece, the operation piece includes an operation unit to be pushed and the body And / or a support plate attached to and held by the cover, an operation unit and the support plate are coupled, and an elastic flexible unit that is bent by a push operation or a string pulling operation, and the switch is pressed to turn on / off. The body and / or the cover includes an attachment holding portion for attaching and holding the support plate.

  According to the first aspect of the present invention, the operation piece mechanism is configured only by attaching the operation piece parts to the cover or the body, and the operation piece (button part) of the operation piece can be reliably pressed regardless of which part is pressed. The switch can be turned on / off.

  Moreover, the fire alarm device according to claim 2 of the present invention is the fire alarm device according to claim 1, wherein the operation portion forms at least a part of an outer peripheral wall of the cover, and supports the operation portion. It has a substantially arcuate or oval shape with long sides in a direction orthogonal to the direction of connecting the plates.

  According to the second aspect of the present invention, the operation part (button part) of the operation piece can be formed in a large shape on the fire alarm cover, and the operation part (button part) of the operation piece can be Even if the minute is pressed, the switch can be turned ON / OFF reliably.

Moreover, the fire alarm device according to claim 3 is the fire alarm device according to claim 1 or 2, wherein the attachment holding portion includes at least two of the support plate along the long side direction of the operation portion. It is a support piece supported and fixed at a location.
For example, the support plate has a long plate shape along the long piece direction of the operation portion, and the attachment holding portion is provided at a position where the vicinity of both end portions of the support plate is supported and fixed.

  According to the third aspect of the present invention, the switch can be reliably turned on / off even if it is pushed at both ends of the operation portion (button portion) of the operation piece.

  According to a fourth aspect of the present invention, there is provided the alarm device according to any one of the first to third aspects, wherein a notch or a recess for inserting a drawstring from the inside of the fire alarm device to the outside during assembly is provided in the body. It is provided on at least one of the outer peripheral wall and the outer peripheral wall of the cover.

  According to the fourth aspect of the present invention, the pull cord for the switch can be extended from the inside of the fire alarm device to the outside of the fire alarm device at the same time when the operation piece is attached to the body or the cover.

  In addition to the configuration of the fire alarm device of the present invention as described above, the predetermined standby state before the push operation or the string pulling operation is maintained, and the operation piece of the operation piece is near the both ends in the long side direction of the operation piece. If the state holding piece is provided on the cover so as to hold a predetermined standby state, the weight before the push operation or the string pulling operation is increased due to the weight of the operation piece having a large shape or the variation in the shape of the elastic flexible portion due to mold molding. It is possible to prevent variations in the arrangement state of the operation pieces and the appearance around the operation pieces, to unify the appearance around the operation pieces for each fire alarm, and to maintain the beauty of the fire alarm.

According to the present invention, in a fire alarm device that is reduced in size and thickness and that has an operation piece separately, the operation piece is configured without using a single switch and a part other than the operation piece, It is possible to increase the shape of the operation piece without increasing the number of assembly processes other than the assembly process to be attached to the cover, and to reliably turn the switch on / off regardless of which part of the operation piece is pushed. is there.
Furthermore, the shape of the operation piece in the vicinity of the fulcrum of the arm part varies slightly from part to part due to mold molding. Since it is possible to unify the arrangement state (predetermined standby state) of the operation piece when the pulling operation is not performed, the operation piece component can be used effectively without being affected by the variation of the component.

(Configuration of fire alarm)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing an example of a fire alarm device according to the present invention, and is an external perspective view showing a smoke fire alarm device 100 for a house that detects smoke and gives an alarm with a buzzer sound or voice.
FIG. 2 is an exploded perspective view of the fire alarm 100 of FIG. 1 (except for the alarm base).
As shown in FIGS. 1 and 2, the fire alarm 100 of the present invention includes a cover 2, a body 3, an operation piece 1, a drawstring 5, an operation indicator lamp guide 43, an operation indicator 44, and an alarm sound emitting hole 45. , A buzzer portion (piezoelectric diaphragm) 46, a dark box 41, and a circuit board 42. In addition, it includes a fire detection unit (light receiving / light emitting element), a battery, and the like (not shown).

  In the fire alarm 100, smoke that is a fire factor flows into the dark box 41 from the smoke inflow portion of the fire alarm 100, and the light emitted from the light emitting element is scattered by the smoke particles flowing into the dark box 41 to receive light. Light is received by the element. When the amount of light received (detected value) received by the light receiving element exceeds a predetermined threshold value, the processing circuit unit or control unit (not shown) determines that a fire has occurred and vibrates (excites) the piezoelectric diaphragm, and the buzzer unit An alarm sound is generated at 46 and a buzzer sound is emitted from the sound emission hole 46 to give an alarm.

  The substantially bow-shaped cutout portion is the operation piece 1 (specifically, the operation unit 11 in FIG. 3) of the fire alarm device of the present invention, and is formed on a part of the cover 2 of the fire alarm device 100. If the operation unit 11) in FIG. 3 is pushed, the buzzer can be sounded or stopped when the fire alarm is tested. That is, the operation piece 1 is an operation button (also called an alarm stop button) for a test or the like, and is a separate part from the cover 2, but the fire alarm as a whole constitutes a part of the cover.

The operation indicator 44 is a through hole into which the operation indicator lamp guide 43 is incorporated. In the operation display unit 44, light emitted from a chip-type LED (not shown) placed on the circuit board 42 is guided to the outside of the fire alarm device 100 through the operation indicator lamp guide 43, and is emitted in a lighting state. The
In other words, the operation display unit 44 emits light in a lighting or blinking state when a fire is detected, a test, a battery exhaustion alarm, or the like.

(Structure around the operation piece)
FIG. 3A is a front view of the operation piece 1 of this embodiment, and FIG. 3B is a perspective view of the operation piece 1 as viewed from the back side (back surface). (C) is an enlarged side view seen from the arrow side of (a).
The operation piece 1 includes an operation portion 11, a support plate 7, locking holes 6a and 6b, elastic flexible portions (arm portions) 4a and 4b, a switch pressing plate 13, and an operation piece removal prevention hook hook portion 12a and 12b. Is done.
Further, as shown in (c), the drawstring 5 can be attached to the string attachment hole 14 of the switch pressing plate 13.
The drawstring 5 is drawn only in (c) for the sake of explanation, and is omitted in (a) and (b).

FIG. 4 is a front view of the cover 2, and FIG. 5 is a rear view of the cover 2.
As shown in FIGS. 4 and 5, the mounting portion of the operating piece 1 of the cover 2 is locking pieces (supporting pieces) 24a and 24b which are locked and supported in the locking holes 6a and 6b of the operating piece 1 and switches. The switch pressing plate storage portion 23 in which the pressing plate 13 is stored engages with the operation piece removal prevention hook hook portions 12a and 12b, and the operation piece 1 is pulled out in the direction opposite to the direction in which the operation piece 1 is pressed. Operation piece removal prevention hooks 22a, 22b for preventing the operation piece removal hooks 22a, 22b, and an operation piece state holding piece for holding a predetermined standby state of the operation piece 1 before the pushing operation or the stringing operation. 21a and 21b.

(Function of the operation piece and assembly method)
Next, a method for assembling the operation piece 1 will be described.
First, for the drawstring 5, a knot is formed in a ring shape so that the knot is large enough to be caught in the string attachment hole 14 of the switch pressing plate 13 erected on the back side of the operation piece 1, and the string attachment hole 14 is inserted and connected.

Next, as shown in FIG. 6, the operation piece 1 is tilted, the tip of the drawstring 5 is brought close to the direction of the white arrow, and the drawstring 5 is passed through the switch pressing plate storage portion 23 of the cover 2. Subsequently, it is assembled from the support plate 7 in the direction of the black arrow.
Then, in the assembled state, the operation piece 1 is slightly tilted in the same horizontal direction as the cover 2, and the engagement holes 6 a and 6 b of the support plate 7 and the engagement pieces (support pieces) 24 a and 24 b on the back surface of the cover 2 are placed. Lock to support and fix.

Next, as can be seen from FIG. 2, the body 3 in which the circuit board 42 and the dark box 41 are assembled in advance and the cover 2 in which the operation piece 1 is assembled are fitted and assembled.
Further, the body 3 and the cover 2 are pinched with screws.

  In this assembling operation, the cover 2 and the body 3 are each provided with a notch 10a for passing the pull string 5 and a recess 10b. Insertion work can be performed.

  The two support pieces 9 a and 9 b provided on the body 3 penetrate the circuit board 42 to fix the mounting position of the circuit board 42 and center the locking holes 6 a and 6 b of the operation piece 1. The support plate 7 is pressed and supported and fixed. Further, the two support pieces 9a and 9b and the locking pieces 24a and 24b are supported and fixed by holding and pressing the support plate 7 by the fitting of the cover 2 and the body 3.

Next, the mechanism of the operation piece 1 when performing the pushing operation or the pulling operation of the pull string 5 will be described.
FIG. 7 shows (a) a state where the right end of the operation unit 11 of the operation piece 1 is pushed, (b) a state where the left end of the operation unit 11 is pushed, and (c) a state where the operation unit 11 is operated. Each of the states in which the center is pushed is shown.
As shown in FIG. 7, the operation piece 1 (part) is sunk (displaced) by the push operation, and one switch (electronic switch component) in the fire alarm (not shown) is turned ON / OFF by the switch pressing plate 13. It is turned off.

  Note that the operation piece 1 is the same as that when the pulling operation is performed by the pulling operation (stringing operation) using the pulling string 5 or by pulling a further string connected to the pulling string 5 (stringing operation). Displace in the direction and turn the switch ON / OFF. That is, in the pushing operation and the stringing operation, the operation piece 1 is pressed in the same direction.

In FIG. 7A, since the right side of the operation unit 11 is pushed in the drawing, the right part of the operation piece 1 sinks and the left part floats. In this case, the position of the locking hole 6a on the right side of the operation piece 1 (FIG. 3A) serves as a fulcrum, and the elastic flexible portion 4a (arm portion 4a) on the right side of the operation piece 1 is greatly bent. The pressing force and the elastic force of the arm portion 4a generated by the pressing force are surely transmitted to the switch pressing plate 13 rather than the case where the stop hole 6a is provided in the center of the operation portion (than the case where the arm portion is provided only in the center).
That is, in the case where the right side of the operation piece 1 is pushed in FIG. 7A, the support plate 7 is centered on the lock hole 6a (fulcrum), and the lock piece (support piece) 24a and the support piece 9a are used. Since it is locked and pinched, it has substantially the same function as cantilever support fixing by the locking hole 6a.

In FIG. 7B, since the left side is pushed in the drawing, the left side portion of the operation piece 1 sinks and the right side portion floats. In this case, the position of the locking hole 6b on the left side of the operation piece 1 (FIG. 3A) serves as a fulcrum, and the elastic flexible part 4b (arm part 4b) on the right side of the operation piece 1 bends greatly. The pressing force and the elastic force of the arm portion 4b generated by the pressing force are reliably transmitted to the switch pressing plate 13 as compared with the case where the stop hole 6b is provided at the center of the operation portion (than when the arm portion is provided only at the center).
That is, when the left side of the operation piece 1 is pushed in FIG. 7B, the support plate 7 is centered on the locking hole 6b (fulcrum), and the locking piece (supporting piece) 24b and the supporting piece 9b are used. Since it is locked and pinched, it has almost the same function as cantilever support fixing by the locking hole 6b.

In FIG. 7C, since the center is pushed in the drawing, the center of the operation piece 1 sinks.
As described above, when an operation piece having a large (long) shape is attached, and can be reliably pushed and operated, and only in the operation piece attaching step and the step of fitting the body and the cover, The operation piece is attached to the cover and supported and fixed.

In addition, the operation piece removal prevention hook hooks 12a and 12b and the switch removal prevention hooks 22a and 22b are pulled in the direction opposite to the direction in which the operation piece 1 is pushed or drawn by the mischief or erroneous operation. It is for preventing it being done.
In the assembly process of attaching the operation piece 1 to the cover 2, the operation piece removal prevention hook hooking portions 12a and 12b and the switch removal prevention hooks 22a and 22b are simultaneously engaged with each other.

When a large-sized operation piece (weight) is used as in the present embodiment, the pushing operation of the operation portion 11 is repeated, and the elastic flexible portions 4a and 4b (arm portions 4a and 4b) are operated pieces. Since it is molded with resin thinner than the other parts, the shape of the elastic flexible part varies. Due to the influence of the variation and the influence of the weight of the operation piece 1, the operation of each fire alarm is performed at the time of assembly. There is a high possibility that the appearance around one piece is not unified. For example, even when the pushing operation is not performed, the appearance of the operation piece performing the pushing operation is depressed (sunk as shown in FIG. 7 State).
In order to prevent this, the state holding pieces 21a and 21b provided on the cover 2 are for eliminating such variations in the arrangement state of the operation pieces during assembly and unifying the appearance of the fire alarm.

  That is, by providing the cover 2 with the state holding pieces 21a and 21b so as to hold the predetermined standby state in the vicinity of both ends in the long side direction of the operation piece, the weight of the cover and the elastic flexible portion by mold molding are provided. The variation in the shape of the operation piece prevents the variation in the arrangement of the operation piece before the push operation or the stringing operation and the appearance around the operation piece, and the appearance around the operation piece for each fire alarm is unified. Can maintain the beauty of

  As described above, the fire alarm of the present invention has good operability, and when a large and long shaped operation piece is used, the mounting holding portion is at least the support plate along the long side direction of the operation portion. Since support pieces (locking pieces 24a and 24b and support pieces 9a and 9b) that are supported and fixed at two locations are provided, the switch is reliably turned on even when pressed at both ends of the operation portion 11 (button portion) of the operation piece 1. / OFF is possible.

Note that the present invention can be appropriately applied without departing from the present invention.
For example, in the embodiment described above, the support plate 7 is provided in the long side direction of the arcuate operation piece 1 and is connected to the operation unit 11 by the two arm portions (elastic flexible portions) 4a and 4b. Although the description has been given of the structure in which the locking holes 6a and 6b provided in the plate 7 are locked to the locking pieces 24a and 24b and held and fixed, the invention is not limited thereto.
For example, the shape of the operation piece (operation part) may be an oval shape that can effectively use a part of the cover in the same manner as the arcuate shape, or the attachment holding part (locking piece / support) of the body or / and the cover. The support plate attached and held by the piece) may be a plate shape (support plate) that does not have a locking hole. Further, when the body and the cover are fitted, the support plate may be pressed and supported by the support piece of the body and the support piece of the cover.
Moreover, it is good also as a structure which makes the end of each arm part (elastic flexible part) the support plate of a shape larger than the diameter of a support piece (or latching piece), for example, and only supports and fixes the part.
In the above-described embodiment, the support plate 7 is attached and held by engaging the lock holes 6a and 6b of the support plate 7 with the lock pieces 24a and 24b of the cover 2. At this time, the support plate 7 may be attached and held by engagement (engagement) between the support plate 7 and the support pieces 9 a and 9 b of the body 3.

FIG. 2 is an external perspective view of a fire alarm showing an embodiment of the present invention. 1 is an exploded perspective view of the fire alarm in FIG. (A) Front view of the operation piece of the fire alarm in FIG. 1 (b) Perspective view seen from the back side of (a) (c) Enlarged side view seen from the arrow direction of (a) Front view of the cover of the fire alarm in Figure 1 Rear view of the cover of FIG. Diagram explaining how to install the operation piece The figure showing the state of the operation piece pushing operation

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Fire alarm 1 Operation piece 2 (Fire alarm) Cover 3 (Fire alarm) Body 4a, 4b Elastic flexible part (arm part)
5 Pulling string 6a, 6b Locking hole 7 Support plate 9a, 9b Attachment holding piece 11 Operation part 12a, 12b Operation piece removal prevention hook hook part 13 Switch pressing plate 14 Pulling string attachment part 21a, 21b Operation piece state holding piece 22a, 22b Operation piece removal prevention hook 23 Switch pressing plate storage portion 24a, 24b Locking piece (support piece)

Claims (4)

A fire alarm comprising a body, a cover, and an operation piece that forms a part of the cover and is operated to be pushed or drawn, and is turned on by the operation of pushing or drawing the operation piece. In a fire alarm with a built-in switch that is turned off,
The operation piece is
An operation unit to be pushed,
A support plate attached to and held by the body and / or cover;
An elastic flexible portion that connects the operation portion and the support plate and bends by a push operation or a string pulling operation;
Formed from a switch pressing plate that presses the switch to turn ON / OFF,
The body and / or cover is
A fire alarm device comprising an attachment holding portion for attaching and holding the support plate.   The operation portion has at least a part of the outer peripheral wall of the cover, and has a substantially arcuate or oval shape having a long side in a direction orthogonal to a direction connecting the operation portion and the support plate. The fire alarm according to claim 1.   3. The fire alarm according to claim 1, wherein the attachment holding portion is a support piece that supports and fixes the support plate at at least two locations along a long side direction of the operation portion.   The cutout portion or the concave portion through which the drawstring is inserted from the inside of the fire alarm device to the outside at the time of assembly is provided on at least one of the outer peripheral wall of the body or the outer peripheral wall of the cover. Fire alarm.

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