JP4733500B2 - Fire detector and fire alarm - Google Patents

Description

  The present invention relates to a fire detector that is installed in a house or the like and detects the presence or absence of a fire in the room or the like, and a fire alarm that issues a warning when a fire is detected.

  With this type of fire detector or fire alarm, the atmosphere of the installed space is taken inside, the light diffusion amount of the taken atmosphere is measured with a light emitting / receiving element, and the smoke concentration of the atmosphere is calculated from the measured light diffusion amount. By determining the occurrence of a fire in the installed space, the fire alarm further warns this by voice or display.

And the detector that takes in the atmosphere of the installed space and measures the amount of light diffused is independent of the main body of the fire detector or fire alarm so that it can measure the amount of light diffused in a small amount of atmosphere. It is provided in a small space protruding from the front surface of the main body, and the atmosphere is often taken into the detection unit through a slit formed over the entire peripheral surface of the detection unit (for example, Patent Document 1). , 2).
JP 2002-197558 A JP 2003-99871 A

  If a detector is installed in a small space protruding forward from the main body of the fire detector or fire alarm, the smoke flowing along the wall or ceiling will get over the step with the main body and be taken into the detector. Depending on the speed of the smoke flow, the smoke flow over the level difference from the main body does not go along the front surface of the main body toward the peripheral surface of the detection section where slits are formed, but rather flows past the detection section. Therefore, it is expected that the atmosphere of the space where the fire detector and the fire alarm are installed cannot be efficiently taken into the detector.

  Therefore, a rectifying plate that guides the flow of smoke over the level difference with the main body to the peripheral surface of the detection unit along the front surface of the main body is disposed, for example, spaced from the front surface of the main body by the protruding height of the detection unit. It is possible.

  In that case, if the current plate is attached to the main body with screws inserted from the back side of the main body in the same way as the main body that is divided into two parts, the assembly work becomes complicated and the manufacturing cost is reduced by the increase in the number of screwing points. In addition, the recovery after use of the service life and dismantling at the time of recycling become troublesome.

  Therefore, if the baffle plate is attached to the main body by the snap-fit method using a locking claw, assembly work and manufacturing costs will not increase, and disassembly during collection and recycling will be easy. If the locking claws are released due to collision of an object or shaking due to an earthquake and the rectifying plate falls off, smoke will be taken into the detector when an essential fire occurs, causing a fire detection or alarm delay. Therefore, it is necessary to take measures to prevent this from happening.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fire detector having a structure that can be easily disassembled at the time of recycling, capable of fixing a current plate without causing an increase in assembly work and manufacturing cost, and It is to provide a fire alarm.

  The present invention according to claims 1 to 3 that achieves the above object relates to a fire detector, and the present invention according to claim 4 relates to a fire alarm.

The fire detector according to the first aspect of the present invention provides a detector that protrudes from a front surface of a housing composed of a front portion of the housing and a rear portion of the housing, and is spaced from the front surface. The fire measured by taking the atmosphere of the fire monitoring area passing through between the front face and the current plate from the peripheral surface of the detection unit and measuring the inside of the detection unit. In the fire detector that detects the presence or absence of a fire in the fire monitoring area based on the smoke concentration of the atmosphere in the monitoring area, a through-hole that protrudes from the front of the housing and penetrates the inside in the protruding direction is formed. A cylindrical boss projecting from the front surface of the housing in a state in which the front portion of the housing is assembled to the rear portion of the housing, and having the same dimension as the protruding height of the detection portion, and the through hole or the vicinity of the through hole The locked part formed in the front part of the case and the baffle plate A flexible piece that can be inserted into the through hole in a state in which the rectifying plate is positioned in the arrangement, and the flexible piece is formed in the flexible piece, and the rectifying plate is positioned in the arrangement and is allowed to be inserted into the through hole. A locking claw that can be locked to the locked portion with the flexure inserted, and protruding from the rear portion of the housing, and the rear portion of the housing assembled to the front portion of the housing A key member extending inward, wherein the key member is attached to the locking claw locked to the locked portion in a state where the housing front portion and the housing rear portion are assembled. It is arrange | positioned in the position which prevents the displacement of the said flexible piece to the direction which cancels | releases the latching | locking part.

  A fire detector according to a second aspect of the present invention is the fire detector according to the first aspect of the present invention, wherein the flexible piece is placed in the through hole with the rectifying plate positioned in the arrangement. While the flexible piece is inserted, the locking claw is locked to the locked portion, and the bending displacement for releasing the locking between the locked portion and the locking claw is enabled. A gap is defined between the through hole, and the key member is configured to position the current plate in the arrangement in a state where the rear part of the casing is assembled to the front part of the casing. It was configured to be inserted between the flexible piece inserted into the through hole and the through hole to fill the gap between the flexible piece and the through hole.

  Furthermore, the fire detector of the present invention described in claim 3 is the fire detector of the present invention described in claim 1, wherein the flexible piece is located in the through hole by positioning the rectifying plate in the arrangement. The locking claw is configured to face the locked portion with a gap in a state where the flexible piece is inserted, and the key member is configured to assemble the housing rear portion with the housing front portion. In this state, the baffle plate is placed between the flexible piece inserted into the through hole with the baffle plate positioned in the arrangement, and the locking claw approaches the engaged portion and is engaged. The flexible piece is configured to bend and deform so as to be stopped.

  The fire alarm of the present invention described in claim 4 comprises the fire detector according to claim 1 or 2, and outputs a fire alarm signal to the outside when the fire detector detects the occurrence of a fire. Features.

  According to the fire detector of the present invention described in claim 1, the cylindrical boss at the front of the casing is arranged so that the current plate covers the detection section and is disposed along the front face at a distance from the front face of the casing. When the flexible piece of the rectifying plate is inserted into the through hole of the housing and the rear part of the casing is assembled to the front part of the casing in this state, the flexible piece is inserted into the through hole or the locked portion of the front part of the casing near the through hole. And the key member is disposed at a position that prevents displacement of the flexible piece in the direction of releasing the locking claw with respect to the locked portion.

  For this reason, the displacement of the flexible piece that releases the locking of the locking claw with respect to the locked portion is prevented by the key member at the rear of the housing, and the snap-fitting method of the locking claw and the locked portion is used. The rectifying plate can be securely attached to the housing so that it does not come off due to collisions with other objects or shaking due to earthquakes. Since it is not necessary, the structure can be easily disassembled at the time of recycling without causing an increase in assembling work or manufacturing cost.

  In addition, in the fire detector of the present invention described in claim 1, if the configuration of the fire detector of the present invention described in claim 2 is adopted, the direction in which the locking claw is released from the locked portion is released. In a state in which the key member is disposed at a position that prevents the displacement of the flexible piece, the flexure is not displaced and no load is applied, and the durability of the flexible piece is maintained higher. be able to.

  Further, in the fire detector of the present invention described in claim 1, if the configuration of the fire detector of the present invention described in claim 3 is adopted, the engagement of the locking claw that is locked to the locked portion. The stop state can be released by removing the rear part of the casing from the front part of the casing, changing the arrangement of the key member, and returning the flexible piece bent and deformed by the key member to the state before the bending deformation. Thus, the structure can be easily disassembled.

  And according to the fire alarm of this invention described in Claim 4, the fire alarm with the effect acquired by the fire detector of this invention described in Claim 1, 2, or 3 can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a fire alarm device according to an embodiment of the present invention. A fire alarm device according to the present embodiment indicated by reference numeral 1 in FIG. 1 includes a main body 3 (corresponding to a casing in the claims). A cylindrical detection unit 7 protruding from the front surface 5 of the main body 3 and a rectifying plate 9 attached to the front surface 5 of the main body 3 so as to cover the detection unit 7 are provided.

  The detection unit 7 is formed with a slit 71 for taking in the atmosphere over the entire peripheral surface, and the detection unit 7 has an atmosphere in the installation space of the fire alarm device 1 taken in from the slit 71. A light-emitting / receiving element (not shown) for measuring the amount of light diffusion is accommodated.

  Note that the measurement result of the light diffusion amount of the atmosphere by the light emitting and receiving element is used to calculate the smoke density of the atmosphere in a microcomputer (not shown) provided inside the main body 3, and the microscopic density based on the calculated smoke density is used. The computer detects the occurrence of a fire in the installation space of the fire alarm device 1 and gives an alarm by the indicator 11 or the speaker 13 provided on the front surface 5 of the main body 3.

  The main body 3 includes a front case 31 (corresponding to a front portion of the casing in the claims) and a rear case 33 (the casing in the claims), as shown in FIG. The front case 31 and the rear case 33 are screws projecting from the front case 31 and the rear case 33 toward the inside of the main body 3, respectively. The fixing bosses 31a and 33a are fastened and fixed by fastening with the mounting screws 35 inserted from the rear case 33 side.

  As shown in FIG. 1, the front surface 5 of the front case 31, which is also the front surface of the main body 3, has a mounting boss 31 b (a cylindrical shape in the claims) having the same dimensions as the protruding height of the detection unit 7 from its four corners. Equivalent to the boss).

  Each of the mounting bosses 31b has a cylindrical appearance, and as shown in FIG. 2, a through hole 31c is formed through the mounting boss 31b in the projecting direction. A locking step 31d (corresponding to the locked portion in the claims) is formed in the vicinity of the opening end on the inside of the main body 3 of 31c.

  A mounting piece 91 (corresponding to a flexible piece in the claims) protrudes from the back surface of the current plate 9 with a thickness (or width) that can be inserted into the through hole 31c of the mounting boss 31b of the front case 31. At the tip of each mounting piece 91, a locking claw 91 a that locks in a snap-fit manner with the locking step 31 d of the mounting boss 31 b of the front case 31 is formed.

  Although there are two attachment pieces 91 shown in FIG. 2, the attachment pieces 91 are actually provided at the four corners on the back surface of the current plate 9 corresponding to the attachment bosses 31 b at the four corners of the front case 31. Each is protruding.

  The mounting pieces 91 are attached to the through holes 31c of the mounting bosses 31b so that the current plates 9 are spaced from the front surface 5 of the main body 3 along the front surface 5. As shown by the solid line in FIG. 3, from the state in which the locking claw 91a is bent on the inner wall of the through hole 31c by inserting 91, as shown by the imaginary line in the enlarged sectional view of the main part of FIG. The locking claw 91a that has passed over the inner wall of the through hole 31c is restored to its original state so as to be locked to the locking step 31d, and a gap S is defined between the inner wall of the through hole 31c. It has such flexibility.

  Incidentally, the gap S is defined with a dimension that allows the mounting piece 91 to bend enough for the locking claw 91a locked to the locking step 31d to release the locked state. The

  As shown in FIG. 2, a key member 33 c having a tapered surface 33 d at the tip is projected from the inner surface 33 b of the rear case 33 facing the inside of the main body 3.

  Note that the key member 33c shown in FIG. 2 is only one that protrudes from the front case 31 at a position corresponding to the lower mounting boss 31b shown in FIG. Further, among the four corners of the rectifying plate 9, the key member 33c is projected from another corner located diagonally to the corner from which the key member 33c shown in FIG.

  Then, as shown in the enlarged cross-sectional view of the main part in FIG. 4, each key member 33c is assembled with the locking claw 91a on the locking step 31d by assembling the rear case 33 to the front case 31 with the current plate 9 attached. The tip is partially inserted so as to fill the gap S between the attachment piece 91 that is locked and the inner wall of the through hole 31c, and the tapered surface 33d is configured to approach or contact the attachment piece 91. Yes.

  Next, the operation of the fire alarm device 1 of the present embodiment will be described along the procedure for assembling the front case 31, the rear case 33, and the current plate 9 configured as described above.

  First, the mounting pieces 91 at the four corners of the rectifying plate 9 are inserted into the through holes 31c of the corresponding mounting bosses 31b at the four corners of the front case 31, and the locking claws 91a of the mounting pieces 91 are inserted into the corresponding mounting bosses 31b. Next, the rear case 33 is attached to the front case 31, and the two key members 33c of the rear case 33 are connected to the corresponding two attachment bosses 31b and attachment pieces. It is made to insert in 91 gaps S between the mounting piece 91 and the inner wall of the through hole 31c.

  Then, at the two corners positioned diagonally among the four corners of the front case 31 and the current plate 9, the locking claw 91a locked to the locking step 31d is released from the locking step 31d. The key member 33c is inserted into the gap S between the mounting piece 91 and the inner wall of the through hole 31c.

  As a result, the rectifying plate 9 is detached from the front case 31 so as to cover the detection unit 7 at a position along the front surface 5 with a distance of the same dimension as the protruding height of the detection unit 7 from the front surface 5 of the front case 31. Mounted impossible.

  For this reason, according to the fire alarm device 1 of the present embodiment, a snap caused by the locking step 31d of the mounting boss 31b and the locking claw 91a of the mounting piece 91 due to a collision of another object or shaking due to an earthquake. The rectifying plate 9 attached to the front case 31 by the fitting method can be prevented from falling off from the front case 31, and no fixing parts such as screws are required separately without causing an increase in assembly work or manufacturing cost. And the baffle plate 9 can be reliably attached to the front case 31 with the form with easy disassembly at the time of recycling.

  In addition, the structure of each attachment piece 91 of the baffle plate 9 and the structure of each key member 33c of the rear case 33 can also be made into a different structure from embodiment mentioned above like the modified embodiment demonstrated below.

  In that case, each mounting piece 91 has each mounting boss 31b of the front case 31 before mounting the rear case 33 so that the current plate 9 is disposed along the front surface 5 with a space from the front surface 5 of the main body 3. In the state where each mounting piece 91 of the current plate 9 is inserted into the through hole 31c, as shown in the enlarged cross-sectional view of the main part in FIG. 5, the locking piece 91a at the tip is a locking step portion of the mounting boss 31b. It is formed so as to be opposed to 31d at an interval.

  Further, as shown in the enlarged cross-sectional view of the main part in FIG. 6, each key member 33 c has the front case 31 to which the rectifying plate 9 is not attached, the rear case 33 assembled, and the tip of each key member 33 c is a through hole. Part 31c is inserted in the vicinity of the opening end on the inner side of the main body 3, and the tapered surface 33d is formed to face the locking step 31d of the mounting boss 31b.

  When the mounting pieces 91 of the rectifying plate 9 and the key members 33c of the rear case 33 are configured as described above, the mounting pieces 91 at the four corners of the rectifying plate 9 are used for the corresponding mounting at the four corners of the front case 31. As shown in FIG. 5, the locking claw 91a of each mounting piece 91 is opposed to the locking step 31d of the corresponding mounting boss 31b, and then the rear case is inserted into the through hole 31c of the boss 31b. 33 is attached to the front case 31.

  Then, as shown in the enlarged cross-sectional view of the main part in FIG. 7, the tapered surfaces 33d of the two key members 33c of the rear case 33 abut against the corresponding two mounting bosses 31b and the mounting pieces 91 at the 91 mounting pieces. Then, the mounting piece 91 is bent and deformed so that the locking claw 91a is close to and locked to the locking step 31d, and the key member 33c is wedge-shaped between the mounting piece 91 and the inner wall of the through hole 31c. It will be inserted.

  As a result, the locking claw 91a locked to the locking step 31d at the two corners located diagonally among the four corners of the front case 31 and the current plate 9 is released from the locking step 31d. Is blocked by the key member 33c having a wedge inserted between the mounting piece 91 and the inner wall of the through hole 31c.

  Therefore, the rectifying plate 9 cannot be detached from the front case 31 so as to cover the detection unit 7 at a position along the front surface 5 with the same dimension as the protruding height of the detection unit 7 from the front surface 5 of the front case 31. Attached to.

  Also by the modified embodiment having such a configuration, the same effect as that of the fire alarm device 1 of the embodiment described above can be obtained.

  According to the fire alarm device 1 of the embodiment described above, the mounting piece 91 is bent and deformed in a state where the locking claw 91a gets over the inner wall of the through hole 31c and is locked to the locking step 31d. In order to prevent the mounting piece 91 from being bent and deformed so that the locking claw 91a is unlocked from the locking step 31d, the mounting piece 91 and the through hole 31c are restored to the previous state. Even if the tip of the key member 33c is inserted into the gap S with the inner wall, the mounting piece 91 does not bend and deform, so that the mounting piece 91 is not placed in a state where a load due to bending deformation is applied. In this way, the durability of the mounting piece 91 can be maintained higher.

  On the other hand, in the case of the modified embodiment described in the latter half, the rear case 33 is removed from the front case 31, and the tip of the key member 33c is extracted from between the attachment piece 91 inserted in a wedge shape and the inner wall of the through hole 31c. As a result, the mounting piece 91 that has been bent and deformed by the key member 33c can be returned to its original state, so that the locking claw 91a locked to the locking step 31d can be easily unlocked. Thus, the structure can be easily disassembled.

  Moreover, in each embodiment mentioned above, although the latching claw 91a shall be formed in the front-end | tip of the attachment piece 91, you may form the latching claw 91a in the attachment piece 91 part other than a front-end | tip, The locking step portion 31b formed in the vicinity of the opening end of the through hole 31c inside the main body 3 in each of the above-described embodiments is spaced from the front surface 5 of the front case 31 at a position along the front surface 5 at the detection unit 7. If the baffle plate 9 is disposed so as to cover the fixing claw 91a of the mounting piece 91 so long as it can be locked or opposed, it may be formed not in the through hole 31c but in the front case 31 portion in the vicinity thereof. Good.

  In each of the above-described embodiments, the fire alarm 1 that outputs an alarm by the indicator 11 or the buzzer 13 when the occurrence of a fire is detected has been described as an example. Needless to say, the present invention can also be applied to a fire detector that detects the occurrence of a fire.

It is a perspective view of the fire alarm which concerns on one Embodiment of this invention. It is the longitudinal cross-sectional view cut | disconnected in the center of the left-right direction of the main body of FIG. It is a principal part expanded sectional view which shows the latching state of the latching claw and the latching step part of FIG. It is a principal part expanded sectional view which shows the bending deformation prevention state of the attachment piece by the key member of FIG. It is a principal part expanded sectional view which shows the latch release state of the latching claw and the latching step part in the fire alarm which concerns on the deformation | transformation embodiment of this invention. It is a principal part expanded sectional view which shows arrangement | positioning in the mounting boss | hub of the key member in the fire alarm which concerns on the deformation | transformation embodiment of this invention. It is a principal part expanded sectional view which shows the bending deformation prevention state of the attachment piece by the key member of FIG.

Explanation of symbols

1 Fire alarm 3 Body (housing)
31 Front case (front of housing)
31b Mounting boss (tubular boss)
31c Through hole 31d Locking step (locked portion)
33 Rear case (back of housing)
33c Key member 5 Main body front face 7 Detection part 9 Current plate 91 Mounting piece (flexible piece)
91a Locking claw S Gap

Claims (4)

A detection unit projecting from the front surface of the housing composed of the front portion of the housing and the rear portion of the housing is covered with a current plate arranged along the front surface at a distance from the front surface, and the front surface and the rectification The atmosphere of the fire monitoring area passing between the plates is taken into the inside from the peripheral surface of the detection unit, and the smoke concentration of the atmosphere of the fire monitoring area measured inside the detection unit is used to detect the fire in the fire monitoring area. In a fire detector that detects the presence or absence of occurrence,
The detection projecting from the front portion of the housing in a state where a through-hole is formed projecting from the front portion of the housing and penetrating through the interior in the projecting direction, and the front portion of the housing is assembled with the rear portion of the housing. A cylindrical boss having the same dimensions as the protruding height of the part ,
A locked portion formed in the front hole portion of the through hole or in the vicinity of the through hole; and
A flexible piece that is provided on the current plate and can be inserted into the through hole in a state where the current plate is positioned in the arrangement;
A locking claw that is formed on the flexible piece, and that can be locked with the locked portion in a state where the flexible plate is inserted into the through hole with the rectifying plate positioned in the arrangement.
A key member that protrudes from the rear of the housing and extends into the housing in a state where the rear of the housing is assembled with the front of the housing;
A direction in which the key member releases the locking of the locking claw locked to the locked portion with the locked portion in a state where the housing front portion and the housing rear portion are assembled. Disposed in a position to prevent displacement of the flexible piece to
A fire detector characterized by that.   The flexible piece causes the locking claw to be locked to the locked portion in a state where the rectifying plate is positioned in the arrangement and the flexible piece is inserted into the through hole. And a gap that enables a flexural displacement for releasing the locking with the locking claw is defined between the through hole, and the key member includes a rear portion of the housing. The flexible plate and the through hole are inserted between the flexible piece and the through hole, which are inserted into the through hole with the rectifying plate positioned in the arrangement in the assembled state with the front portion of the housing. The fire detector according to claim 1, wherein the fire detector is configured to fill the gap.   The flexible piece is configured such that the locking claw is opposed to the locked portion with the flexible plate inserted in the through hole with the rectifying plate positioned in the arrangement. The key member includes a flexible piece inserted into the through hole with the rectifying plate positioned in the arrangement with the rear portion of the housing assembled to the front portion of the housing, and the through hole. The fire detector according to claim 1, wherein the fire detector is configured to be bent and deformed so as to be inserted in between so that the locking claw approaches and locks the locked portion.   A fire alarm comprising the fire detector according to claim 1, and outputting a fire alarm signal to the outside when the occurrence of a fire is detected by the fire detector.

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