JP2019053651A - Sensor cover - Google Patents

Abstract

To provide a sensor cover that can also be attached and detached to and from a fire detector using a detachable jig while protecting the fire detector.SOLUTION: A sensor cover 2 which covers a periphery of a fire sensor 1 fixed to an installation surface is comprised of: a base 10 fixed to the installation surface; and a plurality of protection units 11 extending downward from the base 10. An inner space 13 surrounded by the plurality of protection units 11 has an open lower shape in which the fire sensor 1 is accommodated and into which a detachable jig 3 for attaching and detaching the fire sensor 1 can be inserted. A lower end portion of the plurality of protection units 11 is provided with a ring member 12 which connects the respective protection units 11 and has an opening 12a through which the detachable jig 3 can be inserted.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sensor cover provided to cover the periphery of a fire sensor fixed to an installation surface such as a ceiling surface of a building.

  The fire detector is fixed to an installation surface such as a ceiling surface of the building. In facilities such as gymnasiums, there is a possibility that a flying object such as a ball may collide with a fire sensor, so a sensor cover that covers and protects the periphery of the fire sensor may be provided. The sensor cover is formed so as to cover the entire side surface and lower surface of the fire sensor while not impairing the function of the fire sensor. An example of such a sensor cover is disclosed in Patent Document 1.

JP-A-9-147259

  In order to attach and detach the fire detector provided at a high place with respect to the installation surface, a detachable jig having a long support rod is used. The fire detector is fixed to the installation surface by rotational engagement. The detachable jig has a cup-shaped main body that covers the fire detector at the tip, and the fire detector can be attached and detached by locking the main body to the fire detector and rotating it.

  If there is a detector cover around the fire detector, the detector cover covers the fire detector, so the fire detector should be removed directly with a detachable jig during maintenance or replacement of the fire detector. It is necessary to remove the sensor cover first. For this reason, it was necessary to build a scaffold or use an aerial work vehicle.

  The installed fire detector is subjected to an operation test and a sensitivity test using a test jig. This test jig could not be brought close to the fire detector if the detector cover was still provided.

  The present invention has been made in view of the above problems, and provides a sensor cover that can be attached to and detached from a fire detector with a detachable jig and can be tested with a test jig while protecting the fire sensor. For the purpose.

In order to solve the above problems, the sensor cover according to the invention of claim 1 is a sensor cover that covers the periphery of a fire sensor fixed to the installation surface,
A base portion fixed to the installation surface, and a plurality of protection portions extending downward from the base portion;
The inner space surrounded by the plurality of protection parts is opened downward so that the fire sensor can be accommodated and a detachable jig for attaching / detaching the fire sensor or a test jig for testing the fire sensor can be inserted. It is configured as a feature.

  According to the first aspect of the present invention, the fire detector is protected by a plurality of protective parts, and the fire detector is attached / detached by a detachable jig inserted from below without removing the detector cover, or tested. It can be tested with a jig.

  In the sensor cover according to the second aspect of the present invention, a ring member having an opening through which the attachment / detachment jig can be inserted is provided at the lower end of the plurality of protection parts. It is configured as a feature.

  According to the invention which concerns on Claim 2, since a protection member is connected with a ring member, intensity | strength can be improved.

  Furthermore, the sensor cover according to the invention of claim 3 is characterized in that the protection part is in a rod shape and is provided at a predetermined angle on the base part.

  According to the invention which concerns on Claim 3, a protection part can be made into a simple shape and it can manufacture at low cost.

  Furthermore, the sensor cover according to the invention of claim 4 is characterized in that a reinforcing member for connecting the protective parts is provided at an intermediate position in the longitudinal direction of the protective part.

  According to the invention which concerns on Claim 4, a protection part can be reinforced at a longitudinal direction intermediate position, and intensity | strength can be enlarged more.

  The sensor cover according to the invention of claim 5 is characterized in that the lower part of the protective part is bent outward.

  According to the fifth aspect of the present invention, since the space surrounded by the plurality of protection portions has a shape that expands downward, it is easy to insert a desorption jig or a test jig inserted from below into the space. can do.

  According to a sixth aspect of the present invention, the sensor cover further includes a lower end closing body that closes the lower end portion of the space portion, and the lower end closing body is openable so as to open the space portion downward. It is configured as a feature.

  According to the invention which concerns on Claim 6, since the lower end surface of a sensor cover can be obstruct | occluded normally, a fire sensor can be reliably protected from the flying object from the downward direction.

  According to the sensor cover according to the present invention, the fire detector can be easily detached using the attaching / detaching jig without assembling a scaffold or the like when performing maintenance or replacement of the fire detector. Also, when performing a fire detector operation test or sensitivity test, the test jig can be inserted from below the fire detector, so that the test can be performed without removing the detector cover.

It is a perspective view of the sensor cover of this embodiment. It is a front view showing the relationship between the sensor base provided on a ceiling surface, a fire sensor, a sensor cover, and a detaching jig. It is a top view of the main-body part which comprises the removal | desorption jig | tool. It is a perspective view of the sensor cover from which the number of protection parts differs. It is a perspective view of the sensor cover which provided the reinforcement member. It is a front view of the sensor cover which has the bent protection part. It is a bottom view of a sensor cover when a ring member is provided with a guide. It is a perspective view of a sensor cover and a detachable jig when the detachable jig is guided in the insertion direction by a protective part. It is a front view of the sensor cover which has a lower end obstruction | occlusion body. It is a bottom view of the sensor cover which has a lower end obstruction | occlusion body. It is a front view of the sensor cover of the state which open | released the lower end obstruction | occlusion body.

  Embodiments of the present invention will be described in detail with reference to the drawings. The sensor cover 2 of this embodiment is for protecting the fire sensor 1 by covering the periphery of the fire sensor 1 provided on the ceiling surface of the building. In particular, in the fire sensor 1 installed in a gymnasium or the like, a sensor cover 2 is provided to prevent flying objects such as balls from directly colliding with the fire sensor 1.

  In FIG. 1, the perspective view of the sensor cover 2 of this embodiment is shown. As shown in this figure, the sensor cover 2 includes an annular base portion 10 fixed to the ceiling surface, a plurality of protection portions 11 extending downward from the base portion 10, and an annular shape provided at the lower end portion of the protection portion 11. Ring member 12. The sensor cover 2 is formed of a metal material such as iron or stainless steel. However, it may be formed of other materials such as a resin material.

  The base 10 has a fixing hole 10a through which a screw for fixing to the ceiling surface is inserted. The base portion 10 is formed so that the inner peripheral end portion does not interfere with the fire detector 1 disposed inside.

  The protection portions 11 are formed in a rod shape, and eight protection portions 11 are provided at equal intervals along the circumferential direction of the base portion 10. The space | interval of the protection part 11 is set so that the flying object assumed in the installation location cannot pass.

  The ring member 12 connects all the protection portions 11 in the circumferential direction. An opening 12 a in the lower surface of the sensor cover 2 is formed by the inner peripheral end of the ring member 12. The inner peripheral end of the protection part 11 is substantially at the same position as the inner peripheral end of the ring member 12, and the protection part 11 is located on the outer peripheral side of the opening 12a.

  FIG. 2 is a front view showing the relationship between the sensor base A provided on the ceiling surface, the fire sensor 1, the sensor cover 2, and the attachment / detachment jig 3. A sensor base A for mounting the fire sensor 1 is provided on the ceiling surface. The sensor base A has an engagement fitting for rotationally engaging the fire sensor 1. In FIG. 2, the fire detector 1 is fixed to the detector base A. In the sensor cover 2, an inner region surrounded by the plurality of protection portions 11 is a space portion 13 that is open downward. The space portion 13 is surrounded by a virtual surface that connects the inner peripheral ends located on the innermost side of each protection portion 11, a virtual surface that has the upper end surface of the protection portion 11, and a virtual surface that has the lower end surface of the ring member 12. It refers to the inner space area. An insertion / removal jig 3 for attaching / detaching the fire detector 1 can be inserted into the space 13. For this reason, the diameter of the opening 12a of the ring member 12 serving as the entrance of the space 13 is formed to be larger than the maximum diameter of the attaching / detaching jig 3.

  The attaching / detaching jig 3 is provided with a substantially U-shaped holding portion 21 at the tip end portion of the support bar 20, and a cup-shaped main body portion 25 is held by a holding band 22 fixed to the tip end portion 21 a of the holding portion 21. Yes. In this detachable jig 3, the maximum diameter is the portion of the tip 21 a of the holding portion 21, and the opening 12 a of the ring member 12 has a larger diameter.

  In FIG. 3, the top view of the main-body part 25 which comprises the removal | desorption jig | tool 3 is shown. As shown in this figure, the main body portion 25 has a storage portion 25a capable of covering the outside of the fire detector 1 at the center portion. Locking portions 25b protrude from the circumferential portion 2 in the storage portion 25a. The locking portion 25b is urged in the protruding direction by an elastic member 25c housed in the main body portion 25. The fire detector 1 is rotated by rotating the attaching / detaching jig 3 in the horizontal direction in a state in which the fire detector 1 is covered with the storage portion 25a and the locking portion 25b is locked to the fire detector 1, thereby detecting the rotation. The fire detector 1 can be removed from the instrument base A.

  The sensor cover 2 of the present embodiment is formed by the plurality of protection parts 11 so that the space part 13 is open downward with a diameter into which the attachment / detachment jig 3 can be inserted. Even if 2 is not removed, the fire detector 1 can be attached / detached by the attaching / detaching jig 3. Therefore, the fire detector 1 can be easily removed using the attaching / detaching jig 3 without assembling a scaffold or the like during maintenance or replacement of the fire detector 1. Further, in the operation test and sensitivity test of the fire detector 1, a test jig that covers the fire detector 1 is used. It can be inserted from below. Therefore, the fire detector 1 can be tested without removing the detector cover 2.

  Although the number of the protection units 11 included in the sensor cover 2 is eight in FIGS. 1 and 2, other numbers may be used. In FIG. 4, the perspective view of the sensor cover 2 from which the number of the protection parts 11 differs is shown. The sensor cover 2 in FIG. 4A has four protection parts 11. The sensor cover 2 in FIG. 4B has six protective portions 11. The sensor cover 2 in FIG. 4C has twelve protective portions 11. These protection parts 11 are arranged at predetermined angles in the circumferential direction of the base part 10. However, the protection part 11 does not need to be arrange | positioned at equal intervals.

  It is also possible to improve the strength by providing a reinforcing member in the protection part 11. FIG. 5 shows a perspective view of the sensor cover 2 provided with the reinforcing member 15. As shown in this figure, a belt-like reinforcing member 15 can be provided at an intermediate position in the longitudinal direction of the protection portion 11 so as to connect the protection portions 11 in the horizontal direction. The reinforcing member 15 can improve the strength of the sensor cover 2 and protect the fire sensor 1 more reliably. Further, the number of reinforcing members 15 is not limited to one, and two or more reinforcing members 15 may be provided. Further, the reinforcing member 15 may be provided in the protection unit 11 and the lower ring member 12 may not be provided. In FIG. 5, the reinforcing member 15 is arranged at approximately the center in the length direction of the protection unit 11. However, when the size and direction of the flying object can be predicted, the ring member 12 is adjusted from the center of the protection unit 11 accordingly. It is also possible to arrange it closer to the base 10. Further, the shape of the reinforcing member 15 may not be a belt shape, and may be, for example, a linear shape.

  The protection part 11 does not necessarily need to be linear. FIG. 6 shows a front view of the sensor cover 2 having the bent protection portion 16. In this figure, each protection part 16 is bent so that the lower part extends outward. For this reason, the lower diameter of the space 17 formed by the plurality of protection portions 16 gradually increases. Thereby, the removal | desorption jig | tool 3 can be easily inserted in the space part 17, and the removal operation | work of the fire detector 1 can be made easy. Moreover, the protection part 11 may be bent so that the lower part extends outward from the position on the base 10 side in FIG. 6, or the entire length direction may be bent. Thereby, the detachment jig 3 can be smoothly rotated in the horizontal direction without interfering with the protection part 11 while ensuring the protection effect from flying objects.

  The sensor cover 2 may restrict the insertion / removal jig 3 to be inserted in the circumferential direction. FIG. 7 shows a bottom view of the sensor cover 2 when the ring member 12 is provided with the guide portion 12b. In this figure, the opening 12 a of the ring member 12 is formed to have a smaller diameter than the diameter of the tip 21 a portion of the holding portion 21 that is the maximum diameter of the detachment jig 3. In addition, notched guide portions 12 b are formed at two locations on the ring member 12. The guide part 12b can guide the distal end part 21a of the holding part 21 in the insertion direction. For this reason, the attachment / detachment jig 3 can enter the space portion 13 when the distal end portion 21a of the holding portion 21 is located at the same position as the guide portion 12b in the circumferential direction. That is, the detachable jig 3 enters the space portion 13 in a state of a predetermined angular position in the circumferential direction. The predetermined angular position in the circumferential direction of the detachable jig 3 corresponds to the angular position at which the locking portion 25 b locks against the fire detector 1. Therefore, the attachment / detachment jig 3 inserted up to the position of the fire detector 1 can be locked to the fire detector 1 as it is, and the engagement state with the detector base A can be released by rotation. That is, when the detachment jig 3 is locked to the fire detector 1, it is not necessary to rotate and search for the locking position, so that the fire detector 1 can be easily removed.

  The guide of the detachable jig 3 may be made by the protection unit 11. FIG. 8 shows a perspective view of the sensor cover 2 and the detachable jig 3 when the detachable jig 3 is guided in the insertion direction by the protection unit 11. In addition, the fire detector 1 is abbreviate | omitted in this figure. The sensor cover 2 in this figure has seven protective portions 11 in the circumferential direction and does not have a ring member at the lower end. Thus, the sensor cover 2 may not have a ring member. The seven protection parts 11 are arranged at unequal intervals in the circumferential direction.

  The main body 25 of the detachable jig 3 has a groove-shaped guide groove 25d on the peripheral surface. When the detachment jig 3 is inserted into the space portion 13, the inner portion of the protection portion 11 is in contact with the guide groove 25 d and guides it in the insertion direction. Since the protection part 11 is not arrange | positioned at equal intervals in the circumferential direction, the protection part 11 interferes with the main-body part 25 except when the removal | desorption jig | tool 3 exists in the circumferential direction predetermined angle position, and the main-body part 25 is made into space. It cannot be inserted into the portion 13. That is, the detachable jig 3 can enter the space portion 13 in a state of a predetermined angular position in the circumferential direction. The predetermined angular position in the circumferential direction of the detachable jig 3 corresponds to the angular position at which the locking portion 25b is locked with respect to the fire detector 1 as in the case of FIG.

  Although the lower end portion of the sensor cover 2 described so far is always open downward, it may be normally closed and opened when necessary. In FIG. 9, the front view of the sensor cover 2 which has the lower end obstruction | occlusion body 18 is shown. As shown in this figure, a lower end closing body 18 is fixed to the lower surface of the ring member 12 via a hinge portion 18a. The hinge portion 18a can open the lower end closing body 18 downward and is biased in the opening direction. A magnet 18b is provided at the end of the lower end closing body 18 opposite to the hinge portion 18a, and the lower end closing body 18 can be fixed to the ring member 12 against the biasing of the hinge portion 18a. In FIG. 10, the bottom view of the sensor cover 2 which has the lower end obstruction | occlusion body 18 is shown. As shown in this figure, the lower end closing body 18 has a lattice portion 19 and has a shape that does not hinder the air flow to the fire detector 1. In addition, the shape of the lower end obstruction | occlusion body 18 will not be restricted to the form of FIG. 10, if the airflow is not disturbed, The grid | lattice form from which a space | interval differs, or another shape may be sufficient.

  FIG. 11 shows a front view of the sensor cover 2 in a state where the lower end closing body 18 is opened. The lower end closing body 18 can be opened using a jig or the like having a stronger magnetic force than the magnet 18b. The lower end closing body 18 from which the magnet 18b is separated from the ring member 12 is opened downward by the biasing force of the hinge portion 18a, and the space 13 of the sensor cover 2 is opened downward. Thereby, the attachment / detachment jig 3 can be inserted into the space 13.

  Further, a push-type magnet catch may be provided on the lower end closing body 18 or the sensor cover 2, and the lower end closing body 18 may be pushed to be separated from the sensor cover 2. Further, the fixing of the lower end closing body 18 to the sensor cover 2 is not limited to magnetic force, but may be based on engagement. In this case, an opening jig that hooks and opens the lower end closing body 18 is used. Can do.

  In this way, by providing the lower end closing body 18, the lower surface of the sensor cover 2 can be normally closed, so that the fire detector 1 can be reliably protected from flying objects from below. .

  Although the embodiment of the present invention has been described above, the application of the present invention is not limited to the above-described embodiment, and can be applied in various ways within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Fire detector 2 Sensor cover 3 Detachment jig 10 Base 10a Fixing hole 11 Protection part 12 Ring member 12a Opening part 12b Guide part 13 Space part 15 Reinforcement member 16 Protection part 17 Space part 18 Lower end obstruction body 18a Hinge part 18b Magnet DESCRIPTION OF SYMBOLS 19 Lattice part 20 Support rod 21 Holding member 21a Tip part 22 Holding band 25 Main part 25a Storage part 25b Locking part 25c Elastic member 25d Guide groove

Claims (6)

A sensor cover covering the periphery of a fire sensor fixed to the installation surface,
A base portion fixed to the installation surface, and a plurality of protection portions extending downward from the base portion;
The inner space surrounded by the plurality of protection parts is opened downward so that the fire sensor can be accommodated and a detachable jig for attaching / detaching the fire sensor or a test jig for testing the fire sensor can be inserted. A sensor cover characterized by a shape.   2. The sensor cover according to claim 1, wherein a ring member having an opening through which the protective part is connected and the insertion / removal jig can be inserted is provided at a lower end part of the plurality of protective parts. .   The sensor cover according to claim 1, wherein the protection part is in a rod shape and is provided at a predetermined angle on the base part.   The sensor cover according to claim 3, wherein a reinforcing member for connecting the protection parts is provided at an intermediate position in the longitudinal direction of the protection parts.   The sensor cover according to any one of claims 1 to 4, wherein a lower part of the protection part is bent outward.   The lower end closing body for closing the lower end portion of the space portion is further provided, and the lower end closing body is openable so as to open the space portion downward. Sensor cover according to item.

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