Detector body attachment / detachment tool

Abstract

If fire detectors are installed in high places, large ladders or similar equipment are needed to perform these tasks. Since fire detectors are installed in multiple locations within a building, removing or installing the detector units requires moving large ladders or similar equipment, which makes the work time-consuming. [Solution] The sensor body attachment device of the present invention comprises a support part and a head device fixed to the support part, the head device having an outer frame part, an inner frame part provided inside the outer frame part and capable of housing the sensor body, a temporary fixing device for temporarily fixing the outer frame part to the sensor base, and a rotating device for rotating the inner frame part relative to the outer frame part, wherein the sensor body can be attached to and detached from the sensor base by temporarily fixing the outer frame part to the sensor base with the temporary fixing device and rotating the inner frame part relative to the outer frame part with the rotating device.

Description

Technical Field

[0001] The present invention relates to a sensor body detacher for attaching and detaching a sensor body of a fire detector to and from a sensor base.

Background Art

[0002] Many fire detectors are composed of a sensor base attached to a ceiling or the like and a sensor body detachably attached to the sensor base (see Patent Documents 1 and 2). In such a fire detector, the sensor body can be removed from the sensor base on the ceiling or the like, so that the sensor body can be inspected by an inspection machine or the sensor body can be replaced. The sensor body can be attached by pressing and rotating the sensor body against the sensor base, and the sensor body can be removed by rotating it in the opposite direction. This attachment and detachment are performed by inserting and removing a blade fitting provided on the sensor body into and from a blade receiving fitting provided on the sensor base.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] When attaching the sensor body to a sensor base provided on a ceiling or the like, the operator holds the sensor body by hand and presses it against the sensor base, and rotates the sensor body in the attachment direction. As a result, the blade fitting is inserted behind the blade receiving fitting. When removing the sensor body, the operator places a hand on the sensor body and rotates it in the removal direction opposite to the attachment direction. As a result, the blade fitting is withdrawn from behind the blade receiving fitting. Since the sensor base is provided on a ceiling or the like, the operator climbs on a stepladder or the like to perform these operations.

[0005] If fire detectors are installed in high places, large ladders or similar equipment are needed to perform these tasks. Since fire detectors are installed in multiple locations within a building, removing or installing the detector units requires moving large ladders or similar equipment, which makes the work time-consuming.

[0006] The object of this invention is to provide a detector body attachment / detachment device that allows the detector body of a fire detector to be efficiently attached to and detached from the detector base. [Means for solving the problem]

[0007] A sensor body attachment / detachment device in one embodiment of the present invention comprises a support portion and a head device fixed to the support portion, wherein the head device comprises an outer frame portion, an inner frame portion provided inside the outer frame portion and capable of accommodating a sensor body, a temporary fixing device for temporarily fixing the outer frame portion to the sensor base, and a rotating device for rotating the inner frame portion relative to the outer frame portion, wherein the sensor body can be attached to and detached from the sensor base by temporarily fixing the outer frame portion to the sensor base with the temporary fixing device and rotating the inner frame portion relative to the outer frame portion with the rotating device. [Effects of the Invention]

[0008] The present invention provides a detector body attachment / detachment device that allows the detector body of a fire detector to be efficiently attached to and detached from the detector base. [Brief explanation of the drawing]

[0009] [Figure 1] A side view of a fire detector using the detector body attachment device of Example 1. [Figure 2] Diagram showing the sensor unit from the mounting direction, etc. [Figure 3] A view of the sensor base from the direction in which the sensor body is mounted. [Figure 4] A vertical cross-sectional view of the sensor body attachment device of Example 1. [Figure 5]Plan view of the temporary fixing device in the sensor body attachment / detachment device of Example 1. [Figure 6] A vertical cross-sectional view of the sensor body attachment device of Embodiment 1, in which the head device is fixed diagonally to the support part. [Figure 7] A vertical cross-sectional view of the sensor body attachment / detachment device in Example 1, when attempting to attach the sensor body to the sensor base. [Figure 8] A vertical cross-sectional view of the sensor body attachment / detachment device in Embodiment 1, in which the sensor body is attached to the sensor base. [Figure 9] A longitudinal cross-sectional view of the sensor body attachment device with the head device tilted, in a modified example of Example 1. [Figure 10] A fire detector using the detector body attachment / detachment device of Example 2. [Figure 11] A vertical cross-sectional view of the sensor body attachment device of Embodiment 2, with the head device tilted. [Figure 12] Diagram illustrating the temporary fixing device in Example 2. [Figure 13] A vertical cross-sectional view of the sensor body attachment / detachment device in modified example 1 of Embodiment 2, in which the head device is tilted. [Figure 14] A vertical cross-sectional view of the sensor body attachment device in a modified example 2 of Embodiment 2, in which the head device is tilted. [Modes for carrying out the invention] [Examples]

[0010] Figure 1 is a side view of a fire detector 1 using the detector body attachment device of Embodiment 1. The fire detector 1 comprises a detector body 11 and a detector base 12 to which the detector body 11 is attached. The fire detector 1 is a flame detector that detects fire by optically detecting flames, and the detection direction SD of the detector body 11 is oriented diagonally downward, as indicated by the arrow. On the adjustable mounting base FB on which the fire detector 1 is installed, a base support plate BS is attached to the lower part of the suspension rod HR so as to be angle-adjustable by a pivot. Although not shown, the suspension rod HR is fixed to the building at the top. The detector base 12 is attached to the base support plate BS via a base back plate BB, and the detector base 12 is fixed by the adjustable mounting base FB so as to be oriented diagonally downward. Therefore, the detector body 11 attached to the detector base 12 is oriented diagonally downward, and the detection direction SD of the fire detector 1 is oriented diagonally downward, as shown in Figure 1. Note that when viewed from the opposite direction of the detection direction SD, the fire detector 1 has a circular shape.

[0011] Figure 2 shows a view of the detector body 11 from the mounting direction. Figure 2(a) shows the detector body 11 removed from the detector base 12 in the fire detector 1 shown in Figure 1, as viewed from the side of the detector base 12. Two blade fittings 111 are provided on the mounting surface of the detector body 11, with the blade portion 111a facing outward. Figure 2(b) shows an enlarged side view of the blade fitting 111 and screw 112 as seen from the direction of the arrow in Figure 2(a). The blade fitting 111 is crank-shaped when viewed from the side and is locked by the screw 112. The blade portion 111a outside the part screwed in by the screw 112 in Figure 2(a) is floating upward from the screwed part, as shown in Figure 2(b).

[0012] Fig. 3 shows a view of the sensor base 12 as seen from the mounting direction of the sensor body 11. Two blade receiving fittings 121 are provided on the mounting surface of the sensor base 12. The blade receiving fitting 121 is a leaf spring with one end fixed. When the mounting surfaces of the sensor body 11 and the sensor base 12 are aligned and rotated in the mounting direction, the blade portion 111a of the blade fitting 111潜入 the back side of the blade receiving fitting 121 and engages. Also, by rotating in the removal direction opposite to the mounting direction, the sensor body 11 can be removed from the sensor base 12. By engaging the blade fitting 111 of the sensor body 11 with the blade receiving fitting 121 of the sensor base 12, the sensor body 11 is attached to the sensor base 12, and the blade fitting 111 and the blade receiving fitting 121 are electrically connected.

[0013] Fig. 4 shows a longitudinal sectional view of the sensor body detacher of Example 1. The rotating device 25 is shown in a side view. In the sensor body detacher of Example 1, the head device 2 and the support portion 3 are connected so that the angle can be adjusted. A support rod R is attached to the support portion 3. In Fig. 4, the axial direction RA of the support rod R and the axial direction HA of the head device 2 are facing the same direction, but the angle between the axial direction RA and the axial direction HA can be changed.

[0014] The head device 2 has an inner frame portion 22 capable of accommodating the sensor body 11 inside an outer frame portion 21 having a bottomed cylindrical shape. The inner frame portion 22 has a bottomed cylindrical shape, and a cylindrical inner frame shaft 221 protrudes below the bottom plate. The inner frame shaft 221 fits into a hole provided at the center of the bottom plate of the outer frame portion 21. A base portion 23 is fixed below the bottom plate of the outer frame portion 21. The base portion 23 has a plate-like portion 232 connected below the upper cylindrical portion 231, and a hole through which an angle changing shaft 233 passes is provided near the center of the plate-like portion 232. The inner frame shaft 221 of the inner frame portion 22 reaches up to the inside of the cylindrical portion 231, and the inner frame portion 22 is rotatable with respect to the outer frame portion 21 and the base portion 23.

[0015] In the support section 3, a cylindrical body 32 is fixed to the lower surface of a U-shaped support frame 31 that opens in the axial direction RA indicated by the arrow. Figure 4 is a longitudinal cross-sectional view, so the front side of the support frame 31 is not shown. The support frame 31 has a structure in which the lower parts of two right-angled isosceles triangular plates are connected by a long, narrow rectangular plate. A support rod R is fixed to the cylindrical body 32. A bolt-shaped angle-changing shaft 233 is inserted through the support frame 31, and by tightening a nut (not shown), the right-angled isosceles triangular plates on both sides of the angle-changing shaft 233 sandwich the plate-like portion 232, fixing the angle of the plate-like portion 232 relative to the support frame 31.

[0016] The bottom surface of the outer frame 21 is provided with a control drive device 26 and a plurality of rotating devices 25. Each rotating device 25 is provided with a gear 251 that engages with a gear (not shown) provided on the outside of the inner frame 22 and a gear (not shown) provided on the inside of the outer frame 21. The gear provided on the outer circumference of the inner frame 22 is formed as a plurality of grooves extending in the axial direction HA. Similarly, the gear provided on the inner circumference of the outer frame 21 is also formed as a plurality of grooves extending in the axial direction HA. The control drive device 26 controls the rotation of the rotating devices 25 based on instructions from a remote controller (not shown) connected by wire or wireless.

[0017] The shaft of gear 251 is connected to either a gear drive unit 252 or a gear base 253. The gear drive unit 252 has a drive mechanism for rotating gear 251. The gear base 253 does not have a drive mechanism. In Embodiment 1, four rotating devices 25 are provided on the bottom plate of the outer frame 21, two of which are shown. One of the four rotating devices 25 has a gear drive unit 252, and the remaining three are gear bases 253. By rotating gear 251 with the gear drive unit 252 in one rotating device 25, the inner frame 22 rotates relative to the outer frame 21, and the gears 251 in the other three rotating devices 25, which do not have their own power source, also rotate. In this way, the inner frame 22 can be rotated relative to the outer frame 21 while the inner frame 22 is supported from the outside by the four gears 251.

[0018] A temporary fixing device 24 is provided on the upper part of the cylinder of the outer frame portion 21. In the temporary fixing device 24, a temporary fixing plate 241, which is a plate-shaped member having a slit 241a, is rotatably connected to a part of the edge of the outer frame portion 21 by a hinge 242.

[0019] Figure 5 shows a plan view of the temporary fixing device 24 in the sensor body attachment / detachment device of Embodiment 1. Figure 5 shows the temporary fixing device 24 as viewed from the opposite direction of the arrow in the axial direction HA in Figure 4. The temporary fixing device 24 has a temporary fixing plate 241 with a slit 241a and a hinge 242. The hinge 242 is provided on the extension of the slit 241a of the temporary fixing plate 241. The opposite side of the hinge 242 is an entrance to the slit 241a. The entrance to the slit 241a is formed by widening from the slit 241a. The temporary fixing plate 241 is rotatably attached to a part of the open end of the outer frame portion 21 by the hinge 242, and the temporary fixing plate 241 can be separated from the outer frame portion 21 in the axial direction HA on the opposite side of the hinge 242. In addition, the temporary fixing plate 241 has a tapered portion 241b on the opposite side of the hinge 242. As shown in Figure 4, the tapered portion 241b has a structure in which the portion of the temporary fixing plate 241 that protrudes outward from the outer frame portion 21 is raised in the direction away from the outer frame portion 21 (axial direction HA).

[0020] In the sensor body attachment device of Embodiment 1, the head device 2 can be fixed diagonally to the support part 3 by the angle changing shaft 233. Figure 6 shows a vertical cross-sectional view of the sensor body attachment device of Embodiment 1 with the head device 2 fixed diagonally to the support part 3. In the sensor body attachment device of Embodiment 1 shown in Figure 4, Figure 6 shows the state after loosening the nut (not shown) attached to the bolt-shaped angle changing shaft 233, which is inserted through the support frame 31 and the plate-shaped part 232, to tilt the head device 2, and then tightening the nut. By tightening the nut, the angle of the plate-shaped part 232 relative to the support frame 31 is fixed by sandwiching the support frame 31 and the plate-shaped part 232 from both sides of the angle changing shaft 233, and the head device 2 is fixed diagonally to the support part 3. The axial direction RA of the support rod R is in the direction of the support part 3, and the axial direction HA of the head device 2 is in the direction of the head device 2. In the sensor body attachment / detachment device shown in Figure 6, the head device 2 is tilted so that the axial direction HA faces the sensing direction SD shown in Figure 1.

[0021] Figure 7 shows a vertical cross-sectional view of the sensor body attachment device in Embodiment 1, when attempting to attach the sensor body 11 to the sensor base 12. The sensor body 11, sensor base 12, and adjustable mounting base FB are shown in side views. In the sensor body attachment device, where the head device 2 is fixed diagonally to the support part 3, the sensor body 11 is placed on its inner frame part 22. On the other hand, the sensor base 12 is fixed to the base support plate BS via the base back plate BB, and the base support plate BS is installed diagonally on the suspension rod HR. The base support plate BS is a plate thinner than the width of the slit 241a in the temporary fixing plate 241. The sensor body 11 facing the sensor base 12 is placed on the inner frame part 22 of the sensor body attachment device at approximately the same angle as the sensor base 12. The sensor body 11 is installed on the inner frame 22 so as not to slip when the inner frame 22 rotates, by having the tip of the inner frame 22 fit into the recess (not shown) of the inner frame 21.

[0022] In Figure 7, the temporary fixing device 24 is in the process of being temporarily fixed. In the state before Figure 7, as shown in Figure 6, the temporary fixing plate 241 is blocking the opening of the outer frame 21. In this state, the tapered portion 241b of the temporary fixing plate 241 is hooked onto the back of the upper part of the sensor base 12. Then, the sensor base 12 pushes the tapered portion 241b to separate the tapered portion 241b side of the temporary fixing plate 241 from the outer frame 21, and the base support plate BS is inserted into the slit 241a provided in the temporary fixing plate 241. At this time, the vicinity of the tapered portion 241b of the temporary fixing plate 241 is lifted from the opening of the outer frame 21 by the hinge 242, so the sensor base 12 is housed between the temporary fixing plate 241 and the inside of the outer frame 21, resulting in the state shown in Figure 7.

[0023] Figure 8 shows a vertical cross-sectional view of the sensor body attachment device in Embodiment 1, in which the sensor body 11 is attached to the sensor base 12. The sensor body 11, sensor base 12, and adjustable mounting base FB are shown in side views. From the state in Figure 7, by operating the support rod R, the head device 2 of the sensor body attachment device is pressed toward the sensor base 12, causing the sensor body 11 to come into contact with the sensor base 12, resulting in the state in Figure 8. In this state, the temporary fixing device 24 temporarily fixes the outer frame 21 to the sensor base 12 using the slit 241a of the temporary fixing plate 241 so that the outer frame 21 does not rotate relative to the sensor base 12. This temporary fixing to the sensor base 12 is an indirect temporary fixing via the adjustable mounting base FB. Then, a signal from the remote controller causes the control drive device 26 to rotate the gear drive unit 252, rotating the sensor body 11 in the mounting direction, thereby attaching the sensor body 11 to the sensor base 12.

[0024] The sensor body 11 rotates by rotating the inner frame 22 relative to the outer frame 21 in the mounting direction. This rotational power is provided by a gear 251 that rotates via a gear drive unit 252. The gear 251 engages with an external gear (not shown) located on the outside of the inner frame 22 and an internal gear (not shown) located on the inside of the outer frame 21. When the gear 251 rotates, the action of the four gears 251, including the gear 251 not shown, causes the inner frame 22 to rotate relative to the outer frame 21 in the mounting direction, and the sensor body 11, which is engaged with the inner frame 22, also rotates. Due to the reaction force of this rotation, the outer frame 21 attempts to move. However, the outer frame 21 is connected to a temporary fixing plate 241 via a hinge 242, and the temporary fixing plate 241 is temporarily fixed to the base support plate BS via a slit 241a. As a result, the temporary fixing device 24 temporarily fixes the outer frame portion 21 to the sensor base 12, allowing the sensor body 11 to be attached to the sensor base 12 by the stable head device 2. Furthermore, when the inner frame portion 22 is rotated in the removal direction opposite to the installation direction by the rotating device 25 to remove the sensor body 11 from the sensor base 12, the head device 2 remains stable due to the temporary fixing. In summary, the sensor body attachment / detachment device of Embodiment 1 allows the sensor body 11 to be attached to and detached from the sensor base 12 by temporarily fixing the outer frame portion 21 to the sensor base 12 with the temporary fixing device 24 and rotating the inner frame portion 22 relative to the outer frame portion 21 with the rotating device 25.

[0025] <Variation> Figure 9 shows a vertical cross-sectional view of the sensor body attachment device with the head device 4 tilted in a modified example of Embodiment 1. The head device 4 has the same configuration as in Embodiment 1 except for the structure of the base 43. In the base 43 of the modified head device 4, a cushion 434 is provided between the cylindrical part 431 and the plate-shaped part 432, and the cylindrical part 431 is movable relative to the plate-shaped part 432. The cushion 434 connects one end of two plates 434c by a hinge 434a, and at the other end of the two plates 434c, there is a spring 434b between the two plates 434c. The spring 434b expands and contracts, causing the two plates 434c to rotate around the hinge 434a, which easily adjusts the inclination of the inner frame 22 and the sensor body 11 to match the inclination of the sensor base 12 when using the sensor body attachment device. In the modified example, a hinge 434a and a spring 434b were used for the cushion 434. However, other materials may be used for the cushion 434, such as using a sponge instead of the spring 434b, or using a rubber block as the cushion 434.

[0026] In Example 1 and its modifications, the base support plate BS is a single plate, so there is only one slit 241a. However, if the base support plate BS is formed from two parallel plates, two parallel slits may be provided on the temporary fixing plate, or a wide slit that accommodates the two parallel plates may be provided. Alternatively, even if it is not the base support plate BS, the outer frame portion 21 may be temporarily fixed to prevent rotation by engaging the slit with a member on the sensor base 12 side. The slits on the temporary fixing plate correspond to the shape of the object to be locked, such as the base support plate, and the temporary fixing device uses the slits to temporarily fix the outer frame portion 21 to the sensor base 12 so that the outer frame portion 21 does not rotate relative to the sensor base 12. [Examples]

[0027] Figure 10 shows a fire detector 5 using the detector body attachment device of Embodiment 2. The fire detector 5 is installed on a sloping ceiling board SC. In Figure 10, the fire detector 5 is shown from the side, and the sloping ceiling board SC is shown in cross-section. The fire detector 5 comprises a detector base 52 fixed to the sloping ceiling board SC, and a detector body 51 that can be attached to the detector base 52. The detector body 51 and detector base 52 of the fire detector 5 are equipped with a blade fitting and a blade receiving fitting, similar to the detector body 11 and detector base 12 of the fire detector 1 shown in Figures 2 and 3. The detector body 51 is attached to the detector base 52 by rotating it in the mounting direction while it is in contact with the detector base 52. The detector body 51 can be removed from the detector base 52 by rotating it in the removal direction opposite to the mounting direction while it is attached to the detector base 52. The inner frame 62 is capable of housing the sensor body 51, and in Figure 10, the sensor body 51 housed in the inner frame 62 is attached to the sensor base 52.

[0028] As shown in Figure 10, a body mark 511 is displayed on the annular side of the sensor body 51 as a position indicator, and a base mark 521 is displayed on the annular side of the sensor base 52 as a position indicator. When the sensor body 51 is rotated so that the body mark 511 is on the extension of the base mark 521, the sensor body 51 is attached to the sensor base 52. Conversely, when rotated in the opposite direction, the sensor body 51 is detached from the sensor base 52.

[0029] Figure 11 shows a vertical cross-sectional view of the sensor body attachment device of Embodiment 2 with the head device 6 tilted. Figure 11 shows the sensor body 51, which is installed on the inner frame portion 62 of the sensor body attachment device, in contact with the sensor base 52 fixed to the inclined ceiling plate SC. In this state, where the body mark 511 and the base mark 521 are misaligned, the blade fitting of the sensor body 51 is not fitted into the blade receiving fitting of the sensor base 52, and the sensor body 51 is not attached to the sensor base 52.

[0030] In the sensor body attachment device of Embodiment 2, the head device 6 can be fixed diagonally to the support part 3 by the angle adjustment shaft 633. In Figure 11, the head device 6 is fixed to the support part 3 in accordance with the inclination of the inclined ceiling plate SC and the sensor base 52.

[0031] In the sensor body attachment device of Embodiment 2, temporary fixing devices 64 are provided at four locations on the inner circumference of the outer frame portion 61 of the head device 6. It is sufficient to provide three or more temporary fixing devices 64. The temporary fixing device 64 has a cam top 641, a shaft 642, and a cam base 643. The cam base 643 is attached to the inside near the opening of the outer frame portion 61. In addition, at the base portion 63 fixed to the center of the bottom plate of the outer frame portion 61, an outer frame rotation device 634 is provided between the cylindrical portion 631 and the plate-shaped portion 632. The outer frame rotation device 634 can rotate the outer frame portion 61 by rotating the cylindrical portion 631 relative to the plate-shaped portion 632. The sensor body 51 is installed in the inner frame portion 62 in a state where it does not slip when the inner frame portion 62 rotates, by having the tip of the inner frame portion 62 fit into its recess (not shown).

[0032] The outer frame 61 has an optical sensor 67 on its inner surface, a control drive device 66 on the inner side of its bottom surface, and an LED 68, which is a display device, on the outer side of its bottom surface. In Figure 11, the optical sensor 67 is shown near the temporary fixing device 64 for convenience, but on the inner circumference of the outer frame 61, the optical sensor 67 is installed at a position offset from the temporary fixing device 64 in the axial direction HA. The control drive device 66 performs rotational control driving of the rotating device 65, control driving of the optical sensor 67 and determination based on acquired information, display control driving of the LED 68, etc.

[0033] The optical sensor 67 includes a laser light source (not shown) and a light-receiving element (not shown). By scanning the outer circumference of the sensor body 51 and the sensor base 52 with laser light from the laser light source and receiving the light with the light-receiving element, the positions of the main body mark 511 and base mark 521 relative to the outer frame 61 can be optically detected. The detection result is then displayed on an LED 68, which is a display device, to inform the worker of the installation status of the sensor body 51. These control and driving functions are performed by a control drive device 66.

[0034] Aside from the base 63, temporary fixing device 64, optical sensor 67, and LED 68, the configuration is the same as that of the sensor body attachment device in Embodiment 1. The axial direction RA of the support rod R is in the direction of the support part 3, and the axial direction HA of the head device 6 is in the direction of the head device 6, so in the state shown in Figure 11, the axial directions RA and axial direction HA are in different directions.

[0035] Figure 12 shows an explanatory diagram of the temporary fixing device 64 in Embodiment 2. Figure 12 is an enlarged view from the direction of the arrow in Figure 11. Note that the inclined ceiling plate SC is not shown in Figure 12. Also, the outer circumference of the cam base 643 (see Figure 11) on the axial side HA of the cam top 641 and the cam base 643 on the opposite side of the axial side HA is shown with a dotted line, and is shown transparently so that the cam top 641 etc. can be seen. The cam base 643 is fixed to the inner circumference of the outer frame part 61, and the shaft 642 is installed on the cam base 643. The shaft 642 passes through the cam top 641 and the cam base 643. The area around the cam top 641 is covered with rubber to prevent slipping.

[0036] As shown in Figure 12, the cam spinning top 641 has a curved surface on the side facing the sensor base 52, and each position on the curved surface is at a different distance from the axis 642. In Figure 12, the upper curved surface is at a greater distance from the axis 642 than the lower curved surface. Therefore, when the outer frame portion 61 moves in the direction of the arrow in the rotation direction CD by the outer frame rotating device 634, and the axis 642 also moves in the direction of the arrow in the rotation direction CD, the cam spinning top 641 rotates in the direction of the arrow in the rotation direction RD. As a result, a force is generated in which the axis 642 and the outer surface of the sensor base 52 are pushed away by the cam spinning top 641, and the sensor base 52 is tightened by the multiple temporary fixing devices 64 provided around it. When the sensor base 52 is sufficiently tightened, the outer frame portion 61 can no longer move relative to the sensor base 52 in the rotation direction CD.

[0037] The cam spinner 641 shown in Figures 11 and 12 is biased by a spring (not shown) and rotates and protrudes toward the side of the detector base 52 when the detector base 52 is not present. As shown in Figure 11, the side of the cam spinner 641 toward the detector base 52 has rounded corners in the axial direction HA and the opposite direction of the axial direction HA. Therefore, when the outer frame 61 is rotated in the removal direction, which is opposite to the rotation direction CD in Figure 12, by the rotating device 65, and the cam spinner 641 is pressed against the fire detector 5 by operating the support rod R, the cam spinner 641 rotates and is pulled toward the outer frame 61. The cam spinner 641 can then be pushed to the outside of the outer surface of the detector base 52. After that, when the outer frame 61 is rotated in the mounting direction by the outer frame rotating device 634, the detector base 52 is tightened by the multiple temporary fixing devices 64 provided around it. As described above, the temporary fixing device 64 temporarily fixes the outer frame portion 61 directly to the sensor base 52 so that the outer frame portion 61 does not rotate relative to the sensor base 52.

[0038] On the other hand, when the outer frame 61 is rotated in the removal direction, which is opposite to the rotation direction CD, the curved surface of the cam top 641 on the sensor base 52 side is pulled in towards the outer frame 61. While pulling in the cam top 641, the worker operates the support rod R to move the cam top 641 away from the inclined ceiling plate SC, thereby allowing the cam top 641 and the head device 6 to be removed from the sensor base 52 and the fire detector 5.

[0039] Figure 11 shows that the positions of the main body mark 511 and the base mark 521 are misaligned in the axial direction HA, so the outer frame portion 61 is temporarily fixed to the outside of the sensor base 52 by the temporary fixing device 64, and the sensor body 51 is not attached to the sensor base 52. When the sensor body 51 is rotated in the mounting direction and the positions of the main body mark 511 and the base mark 521 coincide in the axial direction HA, the sensor body 51 becomes attached to the sensor base 52.

[0040] When the outer frame 61 is in close contact with the inclined ceiling panel SC and the optical sensor 67 detects that the inside of the outer frame 61 has become dark, the optical sensor 67 begins scanning with a laser. The laser scans the sides of the sensor body 51 and the sensor base 52 in a direction perpendicular to the axial direction HA, and the light receiving part of the optical sensor 67 detects the brightness of the reflected light. The positions of the body mark 511 and base mark 521 are detected by the timing at which the laser light is absorbed by the body mark 511 and base mark 521 and the reflected light decreases. If the positions of the body mark 511 and base mark 521 are misaligned, the LED 68 blinks, and if they match, it lights up. These control drives are performed by the control drive device 66. In this way, the display device LED 68 indicates that the relative rotation angle has reached the correct angle.

[0041] When removing the sensor body 51 from the sensor base 52, the temporary fixation is released by rotating the outer frame 61 in the opposite direction to when it was installed. Because the direction of rotation of the reaction force acting on the outer frame 61 is reversed, the temporary fixing device 64 is installed on the outer frame 61 so that the cam top 641 faces in the opposite direction. The cam base 643 is removable from the outer frame 61, and the sensor body 51 is removed by installing the cam base 643 in the same way as shown in Figure 12, but with the top and bottom reversed. As described above, the sensor body attachment / detachment device of Embodiment 2 allows the sensor body 51 to be attached to and detached from the sensor base 52 by temporarily fixing the outer frame 61 to the sensor base 52 with the temporary fixing device 64 and rotating the inner frame 62 relative to the outer frame 61 with the rotating device 65.

[0042] In Example 2, four temporary fixing devices 64 are used, but three or more are acceptable. Some of the temporary fixing devices 64 may be protrusions that do not have cam tops 641.

[0043] <Example 1> Figure 13 shows a vertical cross-sectional view of the detector body attachment device in Modification 1 of Embodiment 2, in which the head device 7 is tilted. The fire detector 5 is shown in a side view. In Figure 13, the detector body 51 is in contact with the detector base 52 fixed to the inclined ceiling plate SC, and installation is completed by rotating the detector body 51 in the mounting direction. In Modification 1, the detector body attachment device has a spring 77 at the bottom of the inner frame shaft 721. The spring 77 is installed in a recess of the cylindrical part 731 and pushes up the inner frame shaft 721. Although not shown, the external gear formed as a number of grooves extending axially HA on the outer circumference of the inner frame part 72 of Modification 1 is formed to be long in the axial direction HA so that the inner frame part 72 can move axially HA relative to the outer frame part 71. Otherwise, the configuration is the same as in Embodiment 2. Because the inner frame part 72 is pressed axially HA by the spring 77, the detector body 51 can be pressed and rotated toward the detector base 52.

[0044] <Modification 2> Figure 14 shows a vertical cross-sectional view of the detector body attachment device in Modification 2 of Embodiment 2, in which the head device 9 is tilted. In the fire detector 8 of Modification 2 shown in Figure 14, the diameter of the detector body 81 is smaller than the diameter of the detector base 82. Similar to Embodiment 2, a body mark 811 extending in the axial direction HA is provided on the outer circumference of the detector body 81 as a position indicator. On the other hand, a base mark 821 is provided on the surface of the detector base 82 opposite to the axial direction HA as a position indicator.

[0045] Furthermore, groove-shaped recesses 812 are provided on the side of the sensor body 81. On the other hand, the side of the inner frame 92 with the arrow in the axial direction HA has irregularities, and the protrusions 921 of the inner frame 92 engage with the recesses 812. As a result, the sensor body 81 is installed in the inner frame 92 so as not to rotate around the axial direction HA. This structure is substantially the same as in Embodiments 1 and 2. In addition, in the temporary fixing device 94, the protrusions 942 provided on the inner circumference of the outer frame 91 engage with the recesses 941 of the sensor base 82, thereby installing the outer frame 91 in the sensor base 82 so as not to rotate around the axial direction HA.

[0046] The control drive unit 96 recognizes the position of the base mark 821, which is a marker on the sensor base 82, using the optical sensor 97, and controls the outer frame rotation device 934. The control drive unit 96 and the optical sensor 97 function as angle detection devices that detect the relative rotation angle of the sensor base 82 with respect to the outer frame 91. The control drive unit 96 can then use the detected relative rotation angle to adjust the relative rotation angle to the correct angle. In addition, the control drive unit 96 detects the position of the main body mark 811 using the optical sensor 97 and controls the gear drive unit 952.

[0047] When attaching the sensor body 81 to the sensor base 82 fixed to the inclined ceiling plate SC, the angle between the support part 3 and the head device 9 is adjusted and fixed so that the inclination of the head device 9 matches the inclination of the inclined ceiling plate SC. Then, the sensor body 81 is placed on the inner frame part 92 of the sensor body attachment device. At this time, the protrusion 921 of the inner frame part 92 fits into the recess 812 of the sensor body 81, preventing it from rotating around the axial direction HA. The worker lifts the head device 9 closer to the inclined ceiling plate SC using the support rod R. Then, while placing the outer frame part 91 over the sensor base 82, the outer frame part 91 is rotated using the outer frame rotation device 934 with a control device (not shown) so that the position of the recess 941 of the sensor base 82 and the protrusion 942 provided on the inner circumference of the outer frame part 91 are aligned. At this time, the control drive device 96 recognizes the position of the base mark 821 using the optical sensor 97, determines the angle by which the outer frame rotation device 934 rotates the outer frame portion 91, and rotates the outer frame portion 91. The control drive device 96 functions as an angle detection device that detects the relative rotation angle of the sensor base 82 with respect to the outer frame portion 91. As a result, the protrusion 942 automatically fits into the recess 941 of the temporary fixing device 94, holding the outer frame portion 91 so that it does not rotate relative to the sensor base 82.

[0048] Next, the control drive unit 96 detects the position of the main body mark 811 with the optical sensor 97 and activates the gear drive unit 952. This causes the gear 951 of the rotating device 95 to rotate, and the inner frame 92 rotates relative to the outer frame 91 in the mounting direction. Since the protrusion 921 of the inner frame 92 fits into the recess 812 of the sensor body 81, the sensor body 81 also rotates in the mounting direction as the inner frame 92 rotates. The sensor body 81 is then attached to the sensor base 82. After the sensor body 81 is attached, the mounting work is completed by moving the head device 9 away from the inclined ceiling plate SC.

[0049] To remove the detector body 81 from the detector base 82, the head unit 9 is attached to the fire detector 8. At this time, the control drive unit 96 recognizes the positions of the main body mark 811 and the base mark 821, which are markers, using the optical sensor 97. The control drive unit 96 functions as an angle detection device that detects the relative rotation angle of the detector base 82 with respect to the outer frame 91. The outer frame rotation device 934 is then rotated to automatically accommodate the protrusion 942 in the recess 941 of the temporary fixing device 94, fixing it in the rotational direction. Simultaneously, the rotation device 95 is rotated to accommodate the protrusion 921 of the inner frame 92 in the recess 812 of the detector body 81, fixing it in the rotational direction. The gear drive unit 952 then rotates the gear 951 in the opposite direction to the mounting direction. As a result, the detector body 81 rotates in the removal direction and is separated from the detector base 82. The head unit 9 is then separated from the inclined ceiling plate SC, allowing the detector body 81, which is held in the inner frame 92, to be removed.

[0050] In Example 2 and Modifications 1 and 2, the position of the mark is detected by irradiating it with a laser using an optical sensor 67 or the like. However, the optical sensor 97 may be used as a camera, and the position of the base mark 821, which is a marker for the sensor base 82, may be detected by image recognition of the camera's image using a control drive device 66 or the like.

[0051] In the above-described embodiment, the angle of the head device and support part of the detector body attachment device can be adjusted. However, the angle may be fixed so that the angle cannot be adjusted without providing an angle change axis, and the axial direction of the inner frame, etc., may be inclined with respect to the axial direction of the support rod R. Also, in Embodiments 1 and 2 and modified examples, the axial direction HA and axial direction RA may be aligned as shown in Figure 4, and used for fire detectors mounted on horizontal ceilings. In Embodiment 1, the detector body attachment device can be used for ceiling fire detectors by opening the temporary fixing plate 241.

[0052] Furthermore, the specific configuration is not limited to the embodiments, and any design changes, etc., that do not depart from the spirit of the present invention are also included. In addition, the above-described embodiments and modifications can be combined by utilizing each other's technologies, as long as there are no particular contradictions or problems in their purpose and configuration. [Explanation of Symbols]

[0053] FB: Adjustable mounting base, HR: Suspension rod, BS: Base support plate, BB: Base back plate, SD: Sensing direction, R: Support rod, SC: Sloping ceiling plate, HA: Axial direction, RA: Axial direction, CD: Rotation direction, RD: Rotation direction, 1 Fire detector, 11 Detector body, 111 Blade fitting, 111a Blade part, 112 Screw, 12 Detector base, 121 Blade receiving fitting, 2 Head device, 21 Outer frame section, 22 Inner frame section, 221 Inner frame shaft, 23 Base section, 231 Cylindrical section, 232 Plate-shaped section, 233 Angle changing shaft, 24 Temporary fixing device, 241 Temporary fixing plate, 241a Slit, 241b Tapered section, 242 Hinge, 25 Rotation device, 251 Gear, 252 Gear drive section, 253 Gear base, 26 Control drive device, 3 support part, 31 support frame, 32 cylindrical body, 4 Head device, 43 Base, 431 Cylindrical part, 432 Plate-shaped part, 433 Angle changing axis, 434 Cushion, 434a Hinge, 434b Spring, 434c Plate, 5 Fire detector, 51 Detector body, 511 Body mark, 52 Detector base, 521 Base mark, 6 Head device, 61 Outer frame, 62 Inner frame, 63 Base, 631 Cylindrical part, 632 Plate-shaped part, 633 Angle changing shaft, 634 Outer frame rotation device, 64 Temporary fixing device, 641 Cam top, 642 Shaft, 643 Cam base, 65 Rotation device, 66 Control drive device, 67 Optical sensor, 68 LED, 7 Head device, 71 Outer frame section, 72 Inner frame section, 721 Inner frame shaft, 73 Base section, 731 Cylindrical section, 732 Plate-shaped section, 733 Angle changing shaft, 734 Outer frame rotation device, 76 Control drive device, 77 Spring, 8 Fire detector, 81 Detector body, 811 Body mark, 812 Recess, 82 Detector base, 821 Base mark, 9 Head unit, 91 Outer frame, 92 Inner frame, 921 Protrusion, 93 Base, 931 Cylindrical part, 932 Plate-shaped part, 933 Angle changing shaft, 934 Outer frame rotation device, 935 Gear base, 94 Temporary fixing device, 941 Recess, 942 Protrusion, 95 Rotation device, 951 Gear, 952 Gear drive unit, 96 Control drive device, 97 Optical sensor

Claims

1. It comprises a support part and a head device fixed to the support part, The head device is Outer frame and, An inner frame portion is provided inside the outer frame portion and capable of housing the sensor body, A temporary fixing device for temporarily fixing the outer frame portion to the sensor base, It has a rotating device that rotates the inner frame portion relative to the outer frame portion, The outer frame is temporarily fixed to the sensor base by the temporary fixing device, and the inner frame is rotated relative to the outer frame by the rotating device, thereby making the sensor body detachable from the sensor base. A sensor body attachment / detachment device characterized by the above.

2. The head device is fixed to the support at an angle, or can be fixed at an angle. A sensor body attachment / detachment device as described in claim 1.

3. It has an angle detection device that detects the relative rotation angle of the sensor base with respect to the outer frame, Using the relative rotation angle detected by the angle detection device, it is possible to adjust the relative rotation angle to the correct angle. A sensor body attachment / detachment device as described in claim 2.

4. The angle detection device detects the relative rotation angle by detecting the position of a marker on the sensor base using video or optical detection. The sensor body attachment / detachment device according to feature 3.

5. The system includes a display device that indicates that the relative rotation angle has become the correct angle, based on detection by the angle detection device. The sensor body attachment / detachment device according to feature 4.

6. The temporary fixing device has a plate-shaped member having a slit, A sensor body attachment / detachment device according to claim 1 or 2, characterized in that it is a sensor body attachment / detachment device.

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