JPH08124058A - Fire sensor - Google Patents

Abstract

PURPOSE: To prevent the trouble of a fire sensor due to the shock of its fall, etc., without reducing the sound volume of the alarm tone of the sensor. CONSTITUTION: A piezoelectric buzzer 6 is mounted on a printed board 7 and the board 7 is fixed on the bottom surface of a body 3 by a screw. A sensor part 4 is attached to the top part of an almost cone-shaped cover 2 which is connected to the body 3. A pair of pressure ribs 10 protrude over the inside face of the cover 2 opposite to the buzzer 6 and touche the buzzer 6. At the same time, a pair of side ribs 11 are provided on the bottom surface of the body 3 and touch the circumference face of the buzzer 6. The plane including the ribs 10 is almost orthogonal to the plane including the ribs 10 so that the up-down movement of the buzzer 6 is regulated by the ribs 10 and the front-back or right-left movement of the buzzer 6 is regulated by the ribs 11 respectively. As a result, the movement of the buzzer 6 is regulated against the external shock and the faults of the buzzer 6 due to the breakage of a terminal part 6b, etc., can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector for detecting an abnormality associated with a fire such as smoke or heat and issuing a sound alarm.

[0002]

2. Description of the Related Art Conventionally, there is a so-called smoke sensing type, as shown in FIG. 4, for example, as a fire detector for detecting an abnormality caused by a fire such as smoke or heat and issuing a sound alarm. This smoke-sensing fire detector includes a light-emitting element and a light-receiving element (not shown), and the light-receiving element receives scattered light of smoke particles from the light-emitting element to detect smoke. 4 and a piezoelectric buzzer 6 which is driven based on the sensing output of the sensor unit 4 and emits an alarm sound are mounted inside a body 30 whose front side (upper side in FIG. 4) is formed in a substantially mountain shape. It consists of In the piezoelectric buzzer 6, a terminal portion 6b and a leg piece 6c for supporting the main body 6a are provided upright from the bottom surface of the main body 6a made of resin molding. Then, for example, the terminal portion 6b of the piezoelectric buzzer 6 is soldered and fixed to the printed circuit board 7 attached to the back side of the body 30, and the leg piece 6c having the locking claw 6d at the tip is locked to the printed circuit board 7. The piezoelectric buzzer 6 is fixedly attached to the printed circuit board 7. Here, in order to attach the printed circuit board 7 to the body 30, a plurality of bosses 31 are provided upright on the inner rear surface of the body 30 and inserted through insertion holes (not shown) provided at the four corners of the printed circuit board 7. It is performed by screwing the screw 32 into the boss 31. In addition, the body 3 that faces the front surface of the piezoelectric buzzer 6 that emits sound.
A plurality of holes 30a for facilitating the sound of the piezoelectric buzzer 6 to be heard to the outside are provided in a substantially mountain-shaped portion of 0.

[0003]

However, in the above-mentioned conventional structure, when the fire detector is accidentally dropped on the hard floor during installation, when the impact in the direction shown by the arrow in FIG. 4 is applied. The piezoelectric buzzer 6 may not operate due to the terminal portion 6b and the leg pieces 6c of the piezoelectric buzzer 6 breaking or coming off the printed circuit board 7. Therefore, as shown in FIG. 5, a rib 33 having a substantially cylindrical shape is provided so as to project from the inner surface of the substantially mountain-shaped portion of the body 30 provided with the hole 30a, and the tip of the rib 33 is interposed by a ring-shaped cushion 34. The rib 3 comes in contact with the peripheral edge of the front surface of the piezoelectric buzzer 6.
The piezoelectric buzzer 6 is pressed by 3 to prevent the terminal portion 6b and the leg pieces 6c from being broken or detached as described above. However, the ring-shaped cushion 34 causes the piezoelectric buzzer 6 to
Since it is interposed between the front surface of the fire detector and the rib 33, there is a problem that the volume of the fire detector as a whole is reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a fire detector which prevents a failure due to an impact such as a drop without reducing the volume of an alarm sound.

[0005]

In order to achieve the above-mentioned object, the invention of claim 1 is directed to a sensor section for detecting an abnormality associated with a fire such as smoke or heat, and a case where the sensor section detects an abnormality. It is equipped with a sounding part equipped with a sounding element that is driven and emits an alarm sound.The sensor part is attached to a substantially box-shaped body and the sounding part is installed inside the body to detect the occurrence of a fire and make a sound. In a fire detector that issues an alarm by, a pair of pressing ribs that sandwich the sounding element from both sides and contact the peripheral edge of the sounding element and press down the sounding element are provided on the inner surface of the body facing the sounding element. It is characterized in that a pair of side ribs, which abut on the side surface of the sounding element, are provided inside the body so as to sandwich the sounding element from both sides in a plane substantially orthogonal to the plane including the pressing ribs.

The invention of claim 2 is characterized in that, in the invention of claim 1, there is provided a cushioning means for cushioning the pressing force acting on the sounding element by the pressing rib. The invention of claim 3 is
The invention according to claim 1 or 2 is characterized in that a cushioning piece for cushioning an impact due to bending by an external force is provided on the outer periphery of the body.

[0007]

According to the structure of the invention of claim 1, a pair of pressing ribs for sandwiching the sounding element from both sides and abutting the peripheral edge of the sounding element to press the sounding element downward are provided on the inner surface of the body facing the sounding element. In addition, since a pair of side ribs that abut the side surfaces of the sounding element are sandwiched between the sounding elements in a plane substantially orthogonal to the plane including these pressing ribs, the sounding element is formed by the pair of pressing ribs. The vertical movement of the sound generator is regulated, and the pair of side ribs regulates the movement of the sounding element in the front-rear direction or the left-right direction, and even when an external shock is applied to the fire detector, the sounding element is affected by the shock. It is possible to prevent a failure due to movement or disconnection or breakage of the terminals of the sounding element. Further, since the movement of the sounding element is restricted by the pressing ribs and the side ribs, the alarm sound emitted from the sounding element is not blocked, and the above-mentioned failure can be prevented without lowering the volume of the alarm sound. it can.

According to the second aspect of the invention, since the pressing ribs are provided with the buffering means for buffering the pressing force applied to the sounding element, it is possible to prevent the sounding element from being destroyed by weakening the impact applied to the sounding element from the outside. it can. In the configuration of the third aspect of the present invention, since the cushioning piece for cushioning the shock due to the bending due to the external force is provided on the outer circumference of the body, the shock absorbing from the outside can be softened by the cushioning piece of the body, and the sounding element is not damaged. The destruction can be prevented more reliably.

[0009]

【Example】

(Embodiment 1) As shown in FIG. 1, the fire detector in this embodiment is of a smoke sensing type as in the conventional example, and the basic structure is the same as that of the conventional example. Are denoted by the same reference numerals and description thereof will be omitted. In addition to the smoke sensing type, so-called heat-sensitive type that senses heat from a fire and various other types can be used, and this is a general fire detector equipped with a sounding element that senses a fire and emits an alarm sound. The technical idea of the invention can be applied.

The fire detector body 1 of the present embodiment is formed by connecting a substantially mountain-shaped cover 2 and a bottomed, substantially cylindrical body 3. A circular opening 2a is provided at the top of the cover 2, and a sensor unit 4 (not shown) is arranged in the opening 2a as in the conventional example. On the other hand, a plurality of bosses 5 are provided upright on the bottom surface of the body 3, and the printed circuit board 7 on which the piezoelectric buzzer 6 as a sounding element is mounted is bossed by the screws 8 inserted through the insertion holes 7a provided at the four corners. It is fixed by being screwed to 5. Here, a cushion 9 made of silicone rubber is interposed between the front end surface of the boss 5 and the printed board 7, and the cushion 9 serves as a cushioning means. It should be noted that the printed circuit board 7 is mounted with circuit components (not shown) constituting a drive circuit for driving the piezoelectric buzzer 6.

Further, the piezoelectric buzzer 6 mounted on the printed circuit board 7 includes a substantially cylindrical main body 6a, a terminal portion 6b and a leg piece 6.
c is projected, and the locking claw 6d at the tip of the leg piece 6c is engaged with the printed circuit board 7. Further, as shown in FIG. 2, the terminal portion 6b is configured by inserting the terminal 6f into a cylindrical projection 6e formed integrally with the main body 6a,
The terminal 6f is soldered to the printed circuit board 7 with a cushion 9 interposed between the front end surface of the protrusion 6e and the printed circuit board 7. An opening 6g for emitting sound is provided on the upper surface of the piezoelectric buzzer 6.

By the way, a plurality of holes 2b are provided in a portion of the cover 2 which faces the opening 6g of the piezoelectric buzzer 6 in order to release the sound emitted by the piezoelectric buzzer 6 to the outside. Around the hole 2b, a pair of pressing ribs 10 are erected from the inner surface of the cover 2 so as to sandwich the piezoelectric buzzer 6. The tip end surface of the pressing rib 10 is brought into contact with the upper surface of the piezoelectric buzzer 6 to press the piezoelectric buzzer 6 downward. Further, in the present embodiment, a restriction piece 10a for restricting the lateral movement of the piezoelectric buzzer 6 is provided at the tip of the pressing rib 10 so as to project. That is, the tips of the pressing ribs 10 and the restriction pieces 10a are brought into contact with the peripheral edge of the upper surface of the piezoelectric buzzer 6 to restrict the movement of the piezoelectric buzzer 6 in the vertical direction and the horizontal direction.

On the other hand, on the bottom surface of the body 3, a pair of plate-shaped side ribs 11 are provided at positions facing each other with the piezoelectric buzzer 6 sandwiched therebetween, and the upper end surfaces of the respective side ribs 11 contact the side surfaces of the piezoelectric buzzer 6. I have contacted you. Since the side ribs 11 are provided in a plane that is substantially orthogonal to the plane including the pair of pressing ribs 10, the pressing ribs 10 and the side ribs 11 restrict the movement of the piezoelectric buzzer 6 in the front, rear, left, and right directions. It has become so. The printed board 7 is provided with cutouts 7b at positions facing each other with the piezoelectric buzzer 6 interposed therebetween so as not to interfere with the side ribs 11.

In the above structure, when the body 1 is assembled by connecting the cover 2 and the body 3, the tip surface of the pressing rib 10 comes into contact with the upper surface of the piezoelectric buzzer 6 mounted on the printed circuit board 7, and the piezoelectric buzzer is pressed. 6 is pressed downward (on the side of the body 3), and further, the restricting piece 10a at the tip of the pressing rib 10 and the side rib 11 provided on the bottom surface of the body 3 restrict the piezoelectric buzzer 6 from moving back and forth and left and right. The movement of the piezoelectric buzzer 6 when an impact is applied from the outside is restricted,
It is possible to prevent the terminal portion 6b and the leg pieces 6c of the piezoelectric buzzer 6 from being broken or coming off. Moreover, since there is no obstacle that obstructs the sound on the upper surface of the piezoelectric buzzer 6 which is the sound outlet, the alarm sound is not reduced. Further, the pressing force of the pressing rib 10 is buffered by the protrusion 6e of the terminal portion 6b of the piezoelectric buzzer 6 and the cushion 9 interposed between the printed circuit board 7 and the boss 5, so that the pressing force from the upward direction is also applied. The piezoelectric buzzer 6 can be protected.

(Embodiment 2) FIG. 3 shows a fire detector body 20 according to the present embodiment. Since the structure of this fire detector 20 is the same as that of the first embodiment, the common parts are shown. With respect to the above, illustration and description thereof are omitted, and only the container body 20 which is a feature of the present embodiment will be described. As shown in FIG. 3 (a), this container 20 has a substantially mountain-shaped cover 2 made of synthetic resin.
1 and a body 22 having a substantially cylindrical shape with a bottom. The structure of the body 22 is almost the same as that of the body 3 of the first embodiment.

The cover 21 in this embodiment has a mountain-shaped portion 21b having an opening 21a in which the sensor portion 4 is arranged at the top and is formed in a substantially circular shape, and below the peripheral edge of the mountain-shaped portion 21b. A skirt portion 21c that is vertically installed on the body 2 and a skirt portion 21b that projects downward from the mountain-shaped portion 21b inside the skirt portion 21c.
2 and a coupling portion 21d that couples with 2. In the above configuration, the hem portion 21c of the cover 21 covers the joint portion 21d of the cover 21 and the peripheral wall of the body 22, and the hem portion 21c formed of synthetic resin has elasticity, so that an impact is applied from the lateral direction. Even in the case where the skirt portion 21c is bent, the impact can be mitigated by the bending of the skirt portion 21c, and the impact can be suppressed from reaching the inside of the body 20. That is, in the present embodiment, the hem portion 21c is a cushioning piece that cushions an external impact.

[0017]

According to the first aspect of the present invention, there is provided a sounding unit comprising a sensor unit for sensing an abnormality associated with a fire such as smoke or heat, and a sounding element for driving an alarm sound when the sensor unit senses an abnormality. In a fire detector that senses the occurrence of a fire and issues a sound alarm by attaching a sensor part to a substantially box-shaped body and accommodating a sounding part inside the body, A pair of pressing ribs that sandwich the sounding element from both sides and press the sounding element downward are provided on the inner surface of the body facing the sounding element, and in a plane substantially orthogonal to the plane including these pressing ribs. Since a pair of side ribs that abut the side surface of the sounding element are provided inside the body so as to sandwich the sounding element from both sides, the pair of pressing ribs restricts the movement of the sounding element in the up-and-down direction, and the pair of side surfaces. Is restricted movement in the longitudinal or lateral direction of the sound element by blanking, also sound device when the external impact is applied to the fire detector is a motion by the impact,
It is possible to prevent the terminals of the sounding element from coming off or breaking, resulting in failure. Also, since the movement of the sounding element is restricted by the pressing ribs and the side ribs, the alarm sound emitted from the sounding element is generated. There is an effect that there is no obstruction and the above-mentioned failure can be prevented without lowering the volume of the alarm sound.

According to the second aspect of the present invention, since the pressing ribs are provided with the buffering means for buffering the pressing force applied to the sounding element, it is possible to prevent the sounding element from being broken by weakening the impact applied to the sounding element from the outside. effective. According to the third aspect of the present invention, since the buffer piece for buffering the shock due to the bending due to the external force is provided on the outer periphery of the body, the shock from the outside can be softened by the buffer piece of the body, and the sounding element can be prevented from being broken or broken. There is an effect that the prevention can be performed more reliably.

[Brief description of drawings]

1A and 1B show a first embodiment, in which (a) is a plan sectional view in which a part is omitted, (b) is a front sectional view in which a part is omitted,
(C) is a side sectional view with a part omitted.

FIG. 2 is a plan view showing a main part of the piezoelectric buzzer of the above.

FIG. 3 is a view showing a container according to a second embodiment,
(A) is a front sectional view and (b) is a bottom view.

FIG. 4 is a front sectional view showing a conventional example.

FIG. 5 is a front sectional view showing an essential part of the above.

[Explanation of symbols]

 1 Body 2 Cover 3 Body 4 Sensor 6 Piezoelectric Buzzer 7 Printed Circuit Board 9 Cushion 10 Pressing Rib 11 Side Rib

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location H04R 1/02 105 A H05K 5/02 K 7301-4E

Claims (3)

[Claims] 1. A box comprising a sensor section for detecting an abnormality associated with a fire such as smoke or heat, and a sounding section provided with a sounding element that is driven when an abnormality is detected by the sensor section and emits an alarm sound. In a fire detector that attaches a sensor part to a box-shaped body and a sounding part is installed inside the body to detect the occurrence of a fire and issue a sound alarm, the sounding element is sandwiched from both sides. A pair of pressing ribs that come into contact with the peripheral edge and press the sounding element downward are provided on the inner surface of the body facing the sounding element, and sandwich the sounding element from both sides in a plane substantially orthogonal to the plane including these pressing ribs. A fire detector characterized in that a pair of side ribs that abut the side surface of the sounding element are provided inside the body. 2. The fire detector according to claim 1, further comprising a cushioning means for cushioning a pressing force exerted on the sounding element by the pressing rib. 3. A cushioning piece for cushioning a shock caused by bending due to an external force is provided on the outer periphery of the body.
Alternatively, the fire detector according to claim 2.