Detector mis-installation prevention material

Abstract

To provide a member for preventing erroneous installation of a sensor, capable of preventing the installation of an incorrect type of sensor. [Solution] A detector erroneous installation prevention device is arranged between a base member (20) for installing a detector (10) on the mounting surface of a building and the mounting surface, and prevents the installation of a detector of a type different from the predetermined type when attaching a detector to the base member fixed to a predetermined location on the mounting surface.The detector erroneous installation prevention device is configured to have a first portion (31) that can come into contact with a part of the mounting surface side of the base member, a second portion (32) that extends from the first portion toward the center of the base member, and an interference portion (33) that protrudes from the second portion toward the side opposite the mounting surface.

Description

[Technical Field]

[0001] The present invention relates to a detector erroneous installation prevention member for preventing a detector such as a fire detector from being installed incorrectly on an installation surface such as a ceiling surface. [Background technology]

[0002] Conventional fire detectors include smoke detectors that detect fires by detecting smoke, heat detectors that detect fires by detecting heat, and flame detectors that detect fires by detecting flames. Furthermore, fire detectors are often installed by being connected to a disk-shaped detector base that is pre-installed on a mounting surface such as a ceiling. To reduce costs, some conventional detector installation bases have a common structure for multiple types of detectors, allowing different types of detectors to be installed. Furthermore, fire detectors for fire extinguishing systems sometimes use fire detectors for automatic fire alarm systems, and the detector base and detectors are sometimes standardized.

[0003] In recent years, there have been fire alarm systems in which fire detectors of a type appropriate for each installation location are installed within the same monitoring area to enable early detection and notification of a fire outbreak. When constructing such a system, one method involves installing a common detector base on a ceiling or other surface and then fitting the fire detectors to that base. Another method involves first installing a common detector base on a ceiling or other surface and then fitting the fire detectors to those bases one by one. This raises the risk of incorrect installation, where a fire detector of a different type (category) is coupled to a certain base than the one that should be coupled to it. Furthermore, when detectors need to be replaced, there is a risk of mistakenly installing a fire detector of an inappropriate detection type for the installation location.

[0004] In the past, in fire detectors that are configured so that terminators with built-in terminating resistors can be attached later to the base, an invention has been proposed in which the cases of the terminators are color-coded according to type to prevent the wrong type of terminator from being attached (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 07-29694 Summary of the Invention [Problem to be solved by the invention]

[0006] By applying the concept of the invention in Patent Document 1, it is possible to prevent incorrect installation by coloring the sensor base according to the type of sensor so that the sensor that should be attached to the sensor base can be identified. However, when detectors are colored according to their type, it is difficult for the human eye to distinguish colors when the lighting at the work site is dim, so it is not possible to completely prevent incorrect installation, such as attaching the wrong type of detector to the base. Furthermore, there is a risk of a worker making an operational mistake by attaching the wrong type of detector to the base without checking the color of the base.

[0007] Therefore, the applicant has invented and previously filed an invention (Patent Application No. 2023-29132) in which an interference member having an interference portion and an attachment portion that interferes with the convex portion on the bottom plate of the sensor when the sensor is connected is detachably attached to the bottom wall of the base member of a sensor base that has a base member and multiple connection terminals and is used to fix the sensor to the mounting surface of a building. However, when attaching the sensor base of the prior invention to an already installed sensor, it is necessary to remove the wiring and screws from the base and the sensor's mounting surface, which makes the process cumbersome. Furthermore, when connecting the wiring to the sensor, fingers can interfere with the interference and support parts on the sensor base that are designed to prevent incorrect installation, making the process difficult. Therefore, it became clear that there was room for improvement in the prior invention.

[0008] The present invention has been made in response to the above-mentioned problems, and its purpose is to provide a sensor mis-installation prevention member that prevents the installation of an incorrect type of sensor in a designated location. Another object of the present invention is to provide a member for preventing incorrect installation of a sensor that is less likely to be interfered with by fingers when connecting wires to the sensor. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides: A detector erroneous installation prevention device is disposed between a base member for installing a detector on a mounting surface of a building and the mounting surface, and prevents the installation of a detector of a type different from a predetermined type when installing a detector on the base member fixed to a predetermined location on the mounting surface, It is configured to have a first portion that can contact a part of the base member on the side of the mounting surface, a second portion that extends from the first portion toward the center of the base member, and an interference portion that protrudes from the second portion toward the side opposite the mounting surface.

[0010] According to the sensor erroneous installation prevention member having the above-described configuration, when an attempt is made to install a sensor having a protrusion on its bottom plate on a base member, the protrusion on the sensor's bottom plate interferes with the interference portion, making it impossible to join the sensor to the base member, thereby preventing the wrong type of sensor from being installed on the base member.

[0011] Here, preferably, the base member is a sensor base including a base main body having a bottom wall with an opening in the center and an outer wall formed along the outer edge of the bottom wall, and a plurality of connection terminals to which external terminals provided on the outer surface of the bottom plate of the sensor are connected, The first portion comprises a disk-shaped main body portion having an opening at its center, and the second portion comprises a rod-shaped support portion extending from the opening of the disk-shaped main body portion so as to divide the opening in half, The interference portion is formed so as to protrude from the center of the support portion toward the opening of the sensor base. This configuration has a simple shape and can prevent the wrong type of sensor from being attached to the sensor base.

[0012] Preferably, screw insertion holes are provided on both sides of the opening of the disk-shaped main body, corresponding to screw insertion holes provided in the sensor base for fixing the sensor base to the mounting surface, The disk-shaped main body portion has a first slit extending from the screw insertion hole to an edge of the disk-shaped main body; A second slit is provided extending from the edge of the opening to the edge of the disk-shaped main body. With this configuration, the sensor mis-installation prevention member can be attached to the sensor base without removing the screws that secure the sensor base to the mounting surface and the wiring connected to the terminals of the base member, thereby improving workability.

[0013] Preferably, the disk-shaped main body is divided into a plurality of pieces along a line parallel to the support portion, The cut end surfaces of the plurality of pieces are provided with engaging means for slidably joining together. According to this configuration, the sensor erroneous installation prevention member can be attached to the sensor base without disconnecting the wiring connected to the terminals of the sensor base, thereby improving workability.

[0014] Furthermore, preferably, screw insertion holes are provided on both sides of the opening of the disk-shaped main body, corresponding to screw insertion holes provided in the sensor base for fixing the sensor base to the mounting surface, The screw insertion hole is configured to communicate with the opening while having the same width as the screw insertion location. According to this configuration, the sensor erroneous installation prevention member can be attached to the sensor base without removing the screws that secure the sensor base to the installation surface, thereby improving workability.

[0015] Preferably, the interference portion is configured to be movable along the support portion. With this configuration, by moving the interference portion, fingers are less likely to interfere with the interference portion when handling the wiring connected to the terminals of the sensor base, thereby improving workability.

[0016] Preferably, the support portion includes a pair of support arms extending from an edge of the opening of the disk-shaped main body portion in a direction away from the disk-shaped main body portion, The interference portion is provided between the tip ends of the pair of support arms. With this configuration, the gap between the support arm that supports the interference portion and the edge of the opening of the disc-shaped main body portion is larger, making it less likely that fingers will interfere with the support arm when handling the wiring connected to the terminals of the sensor base, thereby improving workability. [Effects of the Invention]

[0017] The sensor erroneous installation prevention member of the present invention prevents the installation of the wrong type of sensor in a predetermined location, thereby preventing the creation of an inappropriate monitoring state in a monitoring system equipped with multiple sensors. It also has the effect of improving workability by preventing fingers from interfering with wiring to the sensor. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1A is a perspective view showing the configuration of the bottom plate of a differential spot-type fire detector, and FIG. 1B is a perspective view showing the configuration of the bottom plate of a photoelectric spot-type fire detector. [Figure 2] 1 is a perspective view showing an example of the configuration of a sensor base to which a sensor to which a sensor erroneous installation prevention member according to the present invention is applied is attached; [Figure 3] 1 is a perspective view showing a state in which a sensor erroneous installation prevention member according to the present invention is placed on a sensor base. [Figure 4] 1A is a perspective view showing an example of the configuration of a sensor erroneous installation prevention member of the first embodiment of the present invention, and FIG. 1B is a perspective view showing a state in which a complementary member is engaged with a slit of the sensor erroneous installation prevention member of FIG. [Figure 5] 10(A) and 10(B) are perspective views showing an example of the configuration of a sensor erroneous installation prevention member according to a second embodiment of the present invention. [Figure 6] 10A and 10B show examples of the configuration of a sensor erroneous installation prevention member according to a third embodiment of the present invention, in which (A) is a perspective view showing a first example of the erroneous installation prevention member according to the third embodiment, and (B) is a perspective view showing a second example of the erroneous installation prevention member according to the third embodiment. [Figure 7] 10A and 10B show an example of the configuration of a sensor erroneous installation prevention member according to a fourth embodiment of the present invention, in which (A) is a perspective view showing a state in which the movable interference part is positioned in the center, and (B) is a perspective view showing a state in which the movable interference part is displaced outward from the center. [Figure 8] FIG. 10 is a perspective view showing an example of the configuration of a sensor erroneous installation prevention member according to a fourth embodiment of the present invention. [Figure 9] 10A and 10B are perspective views showing modified examples of the sensor erroneous installation prevention member of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of a sensor base to which the present invention is applied will be described with reference to the drawings. In the following description, when the sensor base is attached to a ceiling surface as an attachment surface, the ceiling surface side will be referred to as the upper side, and the opposite side will be referred to as the lower side. The detector mis-installation prevention member of the embodiment described below is configured to have a structure that can prevent misconnection between a differential spot type fire detector and a photoelectric spot type fire detector, as an example. Before describing the configuration of the detector mis-installation prevention member of the embodiment, we will first explain the differences between the differential spot type fire detector and the photoelectric spot type fire detector that the detector base of the embodiment targets.

[0020] A differential spot-type fire detector is equipped with a mechanism that uses the expansion of air due to heat inside the dome-shaped detector case to detect fires. The case also has a relief hole that allows the expanding air to escape through the relief hole in the event of a gradual temperature rise, preventing false alarms. Furthermore, as shown in Figure 1(A), a differential spot-type fire detector has a contact adjustment screw 12 for adjusting the contacts and a cylindrical protective wall 13 surrounding the screw, located in the center of the bottom plate 14 of the main body case 11 of the detector 10. The interior of the protective wall 13 is filled with silicone or the like after the contact adjustment.

[0021] On the other hand, a photoelectric spot type fire detector is a smoke detector that has a head part with an air inlet, and a photoelectric detection part consisting of a light-emitting element and a light-receiving element that detects the concentration of smoke that has flowed in through the air inlet is installed inside the case. Also, unlike differential spot type fire detectors, photoelectric spot type fire detectors do not require contact adjustment, so as shown in Figure 1(B), the bottom plate 14 of the case does not have a contact adjustment screw or a cylindrical protective wall, and the center of the bottom plate 14 has a flat shape.

[0022] 1(A) and 1(B), the components designated by the reference numeral 15 are external terminals that are connected to connection terminals 24 provided on a sensor base 20 (FIG. 2) that is installed at a predetermined location on a mounting surface, such as the ceiling of a building. The external terminals 15 include an inner terminal and an outer terminal with contact pieces that are bent toward each other, and the contact pieces are arranged so that they overlap. When the bottom plate 14 of the sensor is abutted against the underside of the sensor base 20 and then rotated a predetermined angle, the connection terminal 24 of the sensor base 20 is inserted between the contact piece of the inner terminal and the contact piece of the outer terminal, thereby electrically connecting the corresponding terminals of the sensor 10 and the sensor base 20. Also, although the sensor in FIG. 1(B) has one more external terminal 15, two terminals are sufficient to satisfy the electrical specifications, and two of the four external terminals 15 can be omitted.

[0023] The sensor base 20 shown in Figure 2 has a disk-shaped bottom wall 21 that is approximately the same size as the outer cover of the sensor 10, a cylindrical outer wall 22 that is formed to stand on the periphery of the bottom wall 21, and an inner wall 23 that is slightly smaller in diameter than the outer wall 22. The rib 16 provided on the periphery of the bottom plate 14 of the sensor 10 is engaged between the outer wall 22 and the inner wall 23. The bottom wall 21 also has a plurality of connection terminals 24 for connecting the sensor base 20 and the sensor 10, a wire insertion hole 25 through which an electric wire connected to a circuit board stored in the sensor 10 is inserted, and a plurality of screw insertion holes 26 through which fixing screws are inserted to fix the sensor base 20 to a connection part provided on the ceiling side.

[0024] Furthermore, on the bottom wall 21, three terminals 27 are provided which are electrically connected to the connection terminals 24 and into which the ends of the core wires of the electric wires which are drawn out from outside the detector (in the ceiling) and inserted through the electric wire insertion holes 25 are inserted and electrically connected. In the sensor base 20 shown in Fig. 2, one connection terminal 24 corresponding to an electrically unused external terminal 15 is omitted. In other words, Fig. 2 shows the sensor base 20 from which one connection terminal 24 is omitted.

[0025] The detector mis-installation prevention member of the present invention (hereinafter referred to as the mis-installation prevention member) is designed to utilize the above-mentioned structural differences between differential spot-type fire detectors and photoelectric spot-type fire detectors, so that a photoelectric spot-type fire detector can be physically installed on the detector base, while a differential spot-type fire detector cannot be installed. Specific embodiments of the mis-installation prevention member that make this possible will be described below.

[0026] 3 shows a representative example of the mis-installation prevention member 30 shown in FIG. 9(A) in use. As can be seen from FIG. 3, the mis-installation prevention member 30 is disposed on the back surface (upper surface) of the bottom wall 21 of the sensor base 20. In other words, it is attached so that it is sandwiched between the sensor base 20 and the attachment surface (e.g., the ceiling surface). In FIG. 3, the sensor 10 is coupled to the underside of the sensor base 20. The sensor base 20 and the mis-installation prevention member 30 are fixed by inserting fixing screws (not shown) from below into the openings (screw insertion holes 26) of the sensor base 20 and the screw insertion holes 31b of the mis-installation prevention member 30 and screwing them into the attachment surface. This also applies to the mis-installation prevention members of the embodiments described below.

[0027] (First embodiment) FIG. 4 shows the configuration of the mis-attachment prevention member according to the first embodiment of the present invention. 4(A), the mis-installation prevention member 30 of this embodiment includes a disk-shaped main body 31 having a central circular opening 31a, a support portion 32 extending to bisect the circular opening 31a, and a cylindrical interference portion 33 disposed to protrude downward from the center of the support portion 32. The mis-installation prevention member 30 is disposed on the upper surface of the sensor base 20 such that the tip (lower end in the drawing) of the interference portion 33 is positioned within the wire insertion hole 25 of the sensor base 20. Although not particularly limited, the disk-shaped main body 31 is provided with a rib 31e along its periphery, the inner diameter of which is set slightly larger than the outer diameter of the outer wall 22 of the sensor base 20, and the mis-installation prevention member 30 is attached to the sensor base 20 with the rib 31e fitted to the outside of the outer wall 22. In addition, the rib 31e may not be provided, and the disk-shaped main body 31 may be made the same size as the outer diameter of the outer wall 22 of the sensor base 20, or may be made smaller than the inner diameter of the outer wall 22 so as to fit within the sensor base 20.

[0028] Furthermore, the main body 31 of the incorrect installation prevention member 30 of this embodiment is provided with a pair of screw insertion holes 31b at positions facing each other with the opening 31a in between, and a pair of slits 31c extending parallel to the support portion 32 from the pair of screw insertion holes 31b to the outer edge of the main body 31. The pair of screw insertion holes 31b are formed in positions corresponding to the screw insertion holes 26 provided in the sensor base 20. The main body 31 also has a slit 31d extending parallel to the slit 31c from the opening 31a to the outer edge of the main body 31. The height of the interference portion 33 need only be greater than the value obtained by adding the thickness of the bottom wall 21 to the distance between the bottom plate 14 of the sensor and the bottom wall 21 of the sensor base 20, minus the height of the sensor's protective wall 13. It is also desirable that the incorrect installation prevention member 30 be made of an inexpensive, rigid material.

[0029] As described above, the mis-installation prevention member 30 of this embodiment has a pair of slits 31c extending from the screw insertion hole 31b and a slit 31d extending from the opening 31a, so when attaching the mis-installation prevention member 30 to an existing sensor, the fixing screws of the sensor base 20 do not need to be completely removed, but can be loosened to a certain extent to leave a gap between the sensor base 20 and the mounting surface. Specifically, when attaching the mis-installation prevention member 30 to an existing photoelectric spot-type fire detector, first remove the detector 10 from the detector base 20, then loosen the fixing screws of the detector base 20 to create a gap between the detector base 20 and the installation surface, and insert the mis-installation prevention member 30 by moving it laterally into the gap. At this time, the pair of fixing screws are inserted into the slits 31c of the mis-installation prevention member 30, and the wiring (not shown) connected to the detector base 20 is inserted into the slits 31d, and the mis-installation prevention member 30 is moved laterally.

[0030] Thereafter, the fixing screws are tightened to secure the sensor base 20 to the mounting surface, and the sensor 10 is then attached to the sensor base 20, completing the work. The sensor 10 attached to the sensor base 20 can be removed by simply grasping the sensor 10 by hand and rotating it counterclockwise by about 10 to 30 degrees, and when attaching the sensor base 20 to the sensor 10, the sensor can be attached by positioning the external terminal 15 of the sensor 10 next to the connection terminal 24 of the sensor base 20 and then rotating the sensor 10 clockwise by about 10 to 30 degrees. As described above, according to the incorrect installation prevention member 30 of this embodiment, the incorrect installation prevention member 30 can be attached to an existing sensor by loosening the fixing screws without having to disconnect the wiring from the terminals 27 of the sensor base 20 or completely remove the fixing screws of the sensor base 20 from the mounting surface.

[0031] Furthermore, if an attempt is made to mistakenly install a differential spot-type fire detector on the detector base 20 after the misinstallation prevention member 30 of this embodiment has been attached to the detector base 20, the cylindrical protective wall 13 surrounding the contact adjustment screw 12 at the center of the bottom plate 14 of the detector 10 shown in FIG. 1(A) will interfere with the central interference portion 33 of the misinstallation prevention member 30. This prevents the bottom plate 14 of the detector 10 from being joined to the underside of the detector base 20, allowing the worker to easily realize that the type of detector being installed is incorrect and preventing the installation of the incorrect type of detector. As a result, it is possible to prevent the installed detector from activating at an undesired time and issuing a false fire alarm.

[0032] Furthermore, the mis-installation prevention member 30 of this embodiment has an interference portion 33 in its center, which is interposed between the external terminal 15 of the sensor and the connection terminal 24 of the sensor base, thereby preventing accidents in which the positive or negative terminal of the sensor comes into direct contact with the negative or positive terminal of the sensor base. Therefore, even if a short circuit occurs between the L and C terminals (positive and negative terminals) inside the sensor due to, for example, a differential spot-type sensor warming up for some reason and becoming activated, or the sensor being reversely connected to the sensor base, false fire alarms can be prevented. In other words, false fire alarms can be reduced both physically and electrically.

[0033] Furthermore, as shown in Fig. 4(B), the mis-installation prevention member 30 of this embodiment is provided with a complementary member 34 having three parallel engaging pieces 34a shaped to correspond to the three parallel slits 31c, 31d provided in the main body 31, and a connecting portion 34b that connects one end of these engaging pieces 34a. The complementary member 34 is configured to be inserted into and engaged with the slits 31c, 31d after the mis-installation prevention member 30 is installed. This prevents dust from entering the sensor base 20 through the slits 31c, 31d after the mis-installation prevention member 30 is installed, and also maintains the strength of the mis-installation prevention member 30 while improving its appearance.

[0034] (Second embodiment) Next, a second embodiment of the incorrect installation prevention member of the present invention will be described with reference to FIG. As shown in Figure 5(A), the incorrect installation prevention member 30 of this embodiment comprises a disk-shaped main body portion 31 having an opening 31a in the center that is circular overall, a support portion 32 that extends so as to divide the circular opening 31a in half, and a cylindrical interference portion 33 that is arranged to protrude downward from the center of the support portion 32.

[0035] Furthermore, the main body 31 of the incorrect installation prevention member 30 of this embodiment is provided with a pair of screw insertion holes 31b that are continuous with the opening 31a at positions facing each other across the support part 32, and the main body 31 is divided into two along extension lines EL1, EL2 of one side surface of the support part 32. As a result, when one semicircular plate 31A and the other semicircular plate 31B of the divided main body 31 are separated, the opening 31a of the semicircular plate 31A becomes a partially opened notch, through which wiring connected to the sensor base 20 is inserted. Furthermore, a slidable engagement structure, such as a dovetail and a dovetail groove, is provided on the cut end surfaces of the one semicircular plate 31A and the other semicircular plate 31B.

[0036] By having the above-described configuration, the anti-misinstallation member 30 of this embodiment can be attached to an existing sensor by loosening the fixing screws, without having to disconnect the wiring from the terminal 27 of the sensor base 20 or completely remove one of the two fixing screws of the sensor base 20 from the mounting surface. 5(A), by providing a slit in the screw insertion hole 31b of the semicircular plate 31B as in the first embodiment or by making a portion of the support portion 32 detachable, the erroneous installation prevention member 30 can be attached to an existing sensor by loosening the two fixing screws of the sensor base 20 without completely removing them from the mounting surface. Furthermore, as shown in FIG. 5(B), the main body 31 of the erroneous installation prevention member 30 may be configured to be separable into three along four dividing lines DL1, DL2, DL3, and DL4 parallel to the center line of the support portion 32. With this configuration, wiring connected to the sensor base 20 can be inserted through the openings 31a of both the semicircular plate 31A and the other semicircular plate 31B of the main body 31.

[0037] (Third embodiment) Next, a third embodiment of the mis-installation prevention member of the present invention will be described with reference to Fig. 6. In Fig. 6, (A) is a perspective view showing a first example of the mis-installation prevention member of the third embodiment, and (B) is a perspective view showing a second example of the mis-installation prevention member of the third embodiment. 6(A), the incorrect installation prevention member 30 of the first example of this embodiment includes a disk-shaped main body 31 having a circular opening 31a in the center as a whole, a pair of support arms 32a, 32b extending downward from the edge of the opening 31a, and an interference part 33 bridging the lower ends of the support arms 32a, 32b. A circular part 33a with a small diameter is formed in the center of the interference part 33.

[0038] 6(B), the mis-installation prevention member 30 of the second example of this embodiment is formed with a pair of support arms 32a, 32b extending upward, and a cylindrical interference portion 33 that protrudes downward is provided at the center of the horizontal support portion between the upper ends of the support arms 32a, 32b. The height of the interference portion 33 is made higher than the height of the support arms 32a, 32b, so that the lower end of the interference portion 33 protrudes downward beyond the main body portion 31. Furthermore, unlike the mis-installation prevention members 30 of the first and second embodiments, the mis-installation prevention member 30 of this embodiment is not provided with slits 31c, 31d.

[0039] With the mis-installation prevention member 30 configured as described above, as in the first embodiment, when attempting to attach a differential spot-type sensor to the sensor base 20, the protective wall 13 of the contact adjustment screw 12 in the center of the bottom plate 14 interferes with the interfering portion 33 of the mis-installation prevention member 30, making the sensor impossible to attach. On the other hand, because the center of the bottom plate 14 is flat, a photoelectric spot-type sensor does not interfere with the interfering portion 33 and can be attached to the sensor base 20. However, unlike the mis-installation prevention members 30 of the first and second embodiments, it cannot be attached to an existing sensor without removing the sensor base 20 and wiring. In each example of this embodiment, slits 31c and 31d may be provided in main body 31 as in the first embodiment, or main body 31 may be configured to be separable as in the second embodiment. For example, a linear slit can be formed by providing an opening in the entire area sandwiched between the dashed lines in Fig. 6(A), and interference portion 33 is bridged horizontally between the lower ends of support arms 32a and 32b, so that a gap is provided between sensor base 20 and the mounting surface, and when erroneous installation prevention member 30 is inserted by moving it laterally into the gap, the fixing screw does not interfere with interference portion 33. Therefore, installation can be performed by simply loosening the fixing screws of sensor base 20 to a certain extent, without completely removing them, to create a gap between sensor base 20 and the mounting surface.

[0040] FIG. 7 shows a third example of the mis-attachment prevention member of the third embodiment. As shown in Figure 7(A), the incorrect installation prevention member 30 of this embodiment comprises a disk-shaped main body portion 31 having an opening 31a in the center that is circular overall, a support portion 32 that spans the opening 31a so as to divide it in half, and a cylindrical interference portion 33 that is slidably attached to the support portion 32.

[0041] In this embodiment, the interference part 33 has a structure similar to that of a cord stopper, which comprises a tubular member, a cylindrical member inserted into the tubular member, and a spring that presses against the cylindrical member. The tubular member and the cylindrical member have through holes formed therein through which the support part 32 can be inserted, and the support part 32 can be fixed at any position. Therefore, as shown in Fig. 7(B), by moving the interfering portion 33 to a position away from the center of the opening 31a, it is possible to facilitate the work of connecting the wiring to the sensor base 20. Furthermore, after the work of connecting the wiring is completed, by positioning the interfering portion 33 in the center of the opening 31a as shown in Fig. 7(A), it is possible to prevent incorrect installation of the sensor.

[0042] FIG. 8 shows a fourth example of the mis-attachment prevention member of the third embodiment. In the mis-installation prevention member 30 of this embodiment, instead of making the interference portion 33 slidable, a male screw portion 33b is provided at the end (the upper end in the figure) of the cylindrical interference portion 33, and a screw hole is formed in the center of the support portion 32 into which the male screw portion 33b can be screwed, making the interference portion 33 detachable. In this embodiment, the incorrect installation prevention member 30 is used to connect the wiring to the sensor base 20 with the interference portion 33 removed from the central screw hole of the support portion 32, and after the wiring connection work is completed, the male screw portion 33b of the interference portion 33 is screwed into the central screw hole of the support portion 32, as shown in Figure 8, thereby preventing incorrect installation of the sensor.

[0043] Next, a modified example of the mis-attachment prevention member of the present invention will be described with reference to FIG. (First Modification) 9(A), the incorrect installation prevention member 30 of the first modified example comprises a disk-shaped main body 31 having a circular opening 31a in the center as a whole, a support portion 32 extending to bisect the circular opening 31a, and a cylindrical interference portion 33 fixed to or formed integrally with the support portion 32 so as to protrude downward from the center of the support portion 32. In other words, the slits 31c and 31d are omitted from the incorrect installation prevention member 30 of the first embodiment shown in FIG.

[0044] Therefore, like the erroneous installation prevention members 30 of the first to third embodiments, the erroneous installation prevention member 30 of the first modified example can prevent a differential spot-type sensor from being erroneously installed on the sensor base 20. However, unlike the erroneous installation prevention members 30 of the first and second embodiments, it cannot be installed on an already installed sensor without removing the sensor base 20 and the wiring. Also, unlike the erroneous installation prevention member 30 of the third embodiment, it does not have the function of facilitating the handling of the wiring connected to the sensor base 20.

[0045] (Second Modification) 9(B), the incorrect installation prevention member 30 of the second modified example has a rod-shaped member 35 having a length smaller than the diameter of the outer wall 22 of the sensor base 20, and a cylindrical interference portion 33 provided so as to protrude downward from the central lower surface of the rod-shaped member 35. The main body portion 31 is disposed on the bottom wall 21 of the sensor base 20 with the interference portion 33 positioned within the electric wire insertion hole 25 formed in the bottom wall 21 of the sensor base 20. In other words, in this modified example, both end portions of the rod-shaped member 35 that contact the upper surface of the bottom wall 21 function as the main body portion 31, and the central portion of the rod-shaped member 35 that faces the opening (electric wire insertion hole 25) in the bottom wall 21 functions as the support portion 32.

[0046] The ends of the support portion 32 are configured to be positioned using a pair of ribs 26a provided on the edges of a pair of screw insertion holes 26 formed in the bottom wall 21 of the sensor base 20. Alternatively, a locking protrusion 26b may be provided on the bottom wall 21 of the sensor base 20 at a position spaced apart from the ends of the pair of ribs 26a by the width of the support portion 32, and the end of the support portion 32 may be clamped between the locking protrusion 26b and the end of the rib 26a, thereby locking the ends of the support portion 32. Alternatively, a clip structure may be provided on the underside of the support portion 32, and the incorrect installation prevention member 30 may be fixed by clamping the opening edges of the bottom wall 21 from above and below using the clip, utilizing the electric wire insertion hole 25 formed in the bottom wall 21 of the sensor base 20.

[0047] Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments. For example, in the above embodiments, a case has been described in which the configuration is aimed at preventing erroneous installation of a differential spot-type sensor having a protrusion in the center of the bottom plate, but the present invention can also be applied to sensors having a protrusion in a position other than the center of the bottom plate by providing an erroneous installation prevention member having an interference portion in the relevant position. [Explanation of symbols]

[0048] 10 Detector (fire detector) 11 Main unit case 12 Contact adjustment screw 13 Protective wall 14 Bottom plate 15 External terminal 16 Ribs 20 Detector base (base member) 21 Bottom wall 22 Outer wall 23 Inner wall 24 Connection terminal 25 Electrical wire insertion hole (opening) 26 Screw insertion hole 26a Rib 26b Locking protrusion 27 terminals 30 Detector mis-installation prevention material 31 Main body 31a opening 31b Screw insertion hole 31c,31d slit 31e Rib 31A, 31B Semicircular plate 32 Support part 32a, 32b Support arms 33 Interference part 33a Circular section 33b Male thread part 34 Complementary parts 34a Engagement piece 34b Joint 35 Rod-shaped member

Claims

1. A detector erroneous installation prevention member that is disposed between a base member for installing a detector on a mounting surface of a building and the mounting surface, and that prevents the installation of a detector of a type different from a predetermined type when installing a detector on the base member that is fixed to a predetermined location on the mounting surface, A sensor mis-installation prevention member characterized by comprising: a first portion capable of contacting a portion of the mounting surface side of the base member; a second portion extending from the first portion toward the center of the base member; and an interference portion protruding from the second portion toward the side opposite the mounting surface.

2. the base member is a sensor base including a base main body portion having a bottom wall with an opening in the center and an outer wall formed along the outer edge of the bottom wall, and a plurality of connection terminals to which external terminals provided on the outer surface of the bottom plate of the sensor are connected; The first portion comprises a disk-shaped main body portion having an opening at its center, and the second portion comprises a rod-shaped support portion extending from the opening of the disk-shaped main body portion so as to divide the opening in half, 2. The sensor mis-installation prevention member according to claim 1, wherein the interference portion is formed so as to protrude from the center of the support portion toward the opening of the sensor base.

3. screw insertion holes are provided on both sides of the opening of the disk-shaped main body, corresponding to screw insertion holes provided in the sensor base for fixing the sensor base to the mounting surface; The disk-shaped main body portion has a first slit extending from the screw insertion hole to an edge of the disk-shaped main body; 3. The sensor mis-installation prevention member according to claim 2, further comprising a second slit extending from the edge of the opening to the edge of the disk-shaped main body.

4. the disk-shaped main body is divided into a plurality of pieces along a line parallel to the support portion, 3. The sensor mis-installation prevention member according to claim 2, wherein the cut end surfaces of the plurality of pieces are provided with engaging means for slidably joining together.

5. screw insertion holes are provided on both sides of the opening of the disk-shaped main body, corresponding to screw insertion holes provided in the sensor base for fixing the sensor base to the mounting surface; 5. The sensor erroneous installation prevention member according to claim 4, wherein the screw insertion hole communicates with the opening while having the same width as the screw insertion location.

6. 3. The sensor erroneous installation prevention member according to claim 2, wherein the interference portion is configured to be movable along the support portion.

7. the support portion includes a pair of support arms extending from edges of the opening of the disk-shaped main body portion in a direction away from the disk-shaped main body portion, 3. The sensor mis-installation prevention member according to claim 2, wherein the interference portion is provided between the tip ends of the pair of support arms.

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