Perceptor

Abstract

To provide a sensor in which a casing (a sensor cover) housing a circuit board or the like inside is attached to a location of attachment with a fixing tool, and which can facilitate installation via smoothly performance of housing of a lead wire one end of which is connected to the circuit board and attachment with the fixing tool.SOLUTION: A sensor comprises: a sensor portion body including a sensor portion for sensing a change of a state in a room and a circuit board on which the sensor portion is mounted; and a sensor cover that is fixed to a location of attachment in the room with a fixing tool and within which the sensor portion body is housed. The sensor cover comprises: a bottom part that supports the sensor portion body; and an opening that is provided in a center of the bottom part and faces the sensor portion. In the bottom part, a pair of attachment holes are provided along a straight line across the opening, and a longitudinal direction of the sensor portion body, which is long-shaped, is arranged along the straight line in one direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a detector for disaster prevention. [Background technology]

[0002] Known disaster prevention detectors for fires and other emergencies include those that house a circuit board with a sensing element mounted inside a housing, and that are directly attached to a mounting location such as a ceiling with fasteners such as screws (see Patent Document 1 below). Such detectors have a pair of mounting holes in the housing, and screws or other fasteners are inserted into the mounting holes to secure the housing housing the circuit board or other components to the mounting location. Also, a space is provided inside the housing around the circuit board or other components, and this space houses an excess length of a lead wire, one end of which is connected to the circuit board and the other end of which is connected to existing wiring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-209358 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional sensors described above, the excess length of the lead wires is stored by winding them around the narrow space around the circuit board, etc. Therefore, when storing the lead wires, it is necessary to align the lead wires, which makes the installation work complicated.

[0005] Furthermore, when directly mounting conventional sensors, the lead wires are connected to the existing wiring and then mounted using a fixture. However, mounting using a fixture must be performed in conjunction with the task of accommodating the excess lead wire length, which makes it difficult to achieve smooth installation.

[0006] The present invention addresses these problems. That is, in a sensor in which a housing (sensor cover) containing a circuit board and the like is attached to an attachment location using a fastener, the present invention aims to improve workability by facilitating the work of accommodating the lead wires, one end of which is connected to the circuit board, and the work of attaching the sensor using the fastener. [Means for solving the problem]

[0007] In order to solve such problems, the sensor of the present invention has the following configuration. A sensor comprising a sensor body having a sensor unit that senses a change in a state inside a room and a circuit board on which the sensor unit is mounted, and a sensor cover that is attached to a mounting location inside the room with a fixture and that houses the sensor body inside, wherein the sensor cover has a bottom that supports the sensor body and an opening that is provided in the center of the bottom and faces the sensor unit, a pair of mounting holes are provided in the bottom along a straight line on either side of the opening, the longitudinal direction of the sensor body that is elongated in one direction is arranged along the straight line, and lead wires are led out vertically along the outside of the sensor body on a side surface in the longitudinal direction of the sensor body The sensing unit main body is located inside the opening in a plan view. It is characterized by the presence of [Effects of the Invention]

[0008] With the sensor of the present invention having these characteristics, in a sensor in which a sensor cover containing a circuit board or the like inside is attached to the installation location using a fixing device, the work of storing the lead wires, one end of which is connected to the circuit board, and the work of attaching them using the fixing device can be carried out smoothly, thereby improving workability. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an exploded perspective view of a sensor according to an embodiment of the present invention. [Figure 2] 1 is an external perspective view of a sensor according to an embodiment of the present invention; [Figure 3] FIG. 1 is a plan view of a sensor according to an embodiment of the present invention. [Figure 4]1 is a cross-sectional view of a sensor according to an embodiment of the present invention (illustration of an attached state). DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings denote parts with the same functions, and duplicated descriptions in each drawing will be omitted as appropriate.

[0011] 1 to 4, a sensor 1 according to an embodiment of the present invention comprises a sensor body 2 and a sensor cover 3 that houses the sensor body 2. The sensor body 2 comprises a sensor 20, a circuit board 21, a body 22, lead wires 23, and a body cover 24. The sensor cover 3, with the sensor body 2 housed inside, is attached to a mounting location such as a ceiling in a room using a fastener, as will be described later.

[0012] The sensing unit 20 is a sensor that senses changes in the state of the room, and in the illustrated example, a heat-sensitive element using a rod-shaped thermistor is shown, but it is not limited to this and may be a photoelectric smoke sensor that senses smoke, a gas sensor that senses harmful gases such as CO, or a combined sensor that senses a combination of these. The sensing unit 20 is mounted on a circuit board 21 that includes an electronic circuit that processes the signal output of the sensing unit 20. By mounting the sensing unit 20 on the circuit board 21, the aforementioned electronic circuit and the sensing unit 20 are electrically connected. The circuit board 21 on which the sensing unit 20 is mounted is disposed on the front surface of the main body 22.

[0013] One end of the lead wire 23 is connected to the circuit board 21, and the other end is connected to existing wiring installed in the ceiling or the like. The lead wire 23 includes a signal line and a power supply line for transmitting the signal detected by the sensing unit 20 to the outside.

[0014] The main body cover 24 houses the main body part 22 and the circuit board 21 on which the sensing part 20 is mounted, and is engaged with the support frame 5 via the protective frame 4 that protects the sensing part 20. The main body cover 24 has an engaged part (engagement hole) 24A, which is engaged with an engaging part (engagement claw) 5B of the support frame 5. The support frame 5 has a support part 5A, and the circuit board 21 is supported on the support part 5A. The sensing part main body 2 is supported inside the sensor cover 3 via the protective frame 4 and the support frame 5 that protect the sensing part 20.

[0015] The sensor cover 3 comprises a bottom 3A that supports the sensor main body 2, an opening 3B provided in the center of the bottom 3A through which hot air currents and smoke flow toward the sensor 20, and an outer peripheral wall 3C provided on the outer edge of the bottom 3A. The bottom 3A has an attachment hole 10 on the inside for attaching the sensor cover 3 to a mounting location.

[0016] A protective rib 3D that protrudes outward and protects the sensing unit 20 is provided around the opening 3B on the outside of the bottom 3A of the sensor cover 3. The protective rib 3D is provided around the opening 3B facing the sensing unit 20, and has the function of surrounding the sensing unit 20 located at the center of the opening 3B to protect it from mechanical shocks and the like. In addition, a tool insertion hole 3E is provided on the outside of the bottom 3A of the sensor cover 3.

[0017] The sensor cover 3 has a pair of mounting holes 10 on the inside of the bottom 3A, sandwiching the opening 3B, and the pair of mounting holes 10 are arranged along a straight line L shown by a dashed line in FIG. 3. Each of the pair of mounting holes 10 has elongated holes 10A and 10B that communicate with the tool insertion hole 3E described above. The elongated holes 10A and 10B extend along the straight line L shown in the figure, and their longitudinal directions coincide with the direction of the straight line L shown in the figure. The straight line L shown in the figure passes through the centers of the elongated holes 10A and 10B and the center of the opening 3B (the center of the bottom 3A).

[0018] The sensing unit main body 2, which is supported on the inside of the bottom 3A of the sensor cover 3, has a shape that is elongated in one direction in a plan view, as shown in Fig. 3. The longitudinal direction of the sensing unit main body 2 is arranged along a straight line L. More specifically, the sensing unit main body 2 is arranged in the center of the bottom 3A so as to overlap with the straight line L.

[0019] By arranging the sensing unit main body 2 in this manner, storage spaces S1 and S2 of approximately equal size are formed inside the sensor cover 3 on both sides of the straight line L. These storage spaces S1 and S2 are spaces for storing the excess length of the lead wire 23 described above inside the sensor cover 3.

[0020] A screw head abutment 13 is provided between the sensing unit main body 2 supported on the inside of the bottom 3A and one of the mounting holes 10, and guides the screw head of the fixture protruding from the mounting location into the mounting hole 10. The screw head abutment 13 is provided integrally with the support frame 5, as shown in FIG.

[0021] As shown in Figure 3, the mounting hole 10 described above has a hook piece 11 provided in an elongated hole 10A on one side. The hook piece 11 is provided around the elongated hole 10A, and a notch is formed in the center of the bottom 3A. The mounting hole 10 on the side where the hook piece 11 is provided has a screw insertion guide 12. In addition, the length L1 of the elongated hole 10A of the mounting hole 10 on the side having the hook piece 11 is longer than the length L2 of the elongated hole 10B of the other mounting hole 10.

[0022] The screw insertion guide 12 is a pair of flat ribs erected on the inner surface of the bottom 3A, and is inclined with respect to the straight line L so that the gap between them widens toward the center of the bottom 3A and narrows toward the elongated hole 10A of the mounting hole 10, thereby guiding the screw head of a screw placed between them into the notch in the hook piece 11. The screw head abutment 13 described above is provided between the pair of ribs of the screw insertion guide 12.

[0023] The installation procedure for the sensor 1 will be described with reference to Figure 4. When installing the sensor 1 in the installation location T, one screw (fixture) N is installed in advance in the installation location T. Then, with the existing wiring K pulled out from the wiring pull-out hole T1 in the installation location T, the lead wire 23 of the sensor 1 is connected to the existing wiring K pulled out from the wiring pull-out hole T1 at the connection part J. The connected lead wires 23 are then stored in the storage spaces S1 and S2 of the sensor cover 3. Then, as shown in Figure 4, the screw head Nt of the screw N is abutted against the screw head abutment part 13 provided between the sensor main body 2 and the installation hole part 10, and the sensor 1 is then slid sideways to hook the screw head Nt onto the hook piece 11 as shown by the dashed line in the figure.

[0024] In this way, when the screw head Nt of the screw N is caught on the hook piece 11, the sensor 1 is locked to the attachment location T.

[0025] In this state, the sensor 1 is adjusted by sliding it sideways so that the elongated hole 10B on the other side is aligned with the screw hole M of the mounting location T, and another screw is inserted through the tool insertion hole 3E that communicates with the elongated hole 10B and screwed into the screw hole M. Finally, a tool (a screwdriver) is inserted into the tool insertion hole 3E to tighten the two screws, completing the mounting.

[0026] The sensor 1 capable of such an installation work can be easily locked to the installation location T by simply sliding the sensor 1 sideways while the screw head Nt of the screw N, which has been previously attached to the installation location T, is abutted against the screw head abutment portion 13.

[0027] Furthermore, when storing the lead wires 23 connected to the existing wiring K inside the sensor cover 3, the pair of large storage spaces S1, S2 can be used to store the lead wires 23 without having to align them, making the storage work easy and allowing for smooth screw tightening afterwards.

[0028] Furthermore, when the sensor 1 is fastened to the mounting location T with the screw N and a screw is inserted into the other mounting hole 10, the length L1 of the elongated hole 10A of the mounting hole 10 on the side where the hook piece 11 is provided is made longer than the length L2 of the elongated hole 10B of the other mounting hole 10, so that the adjustment range for sliding the sensor 1 sideways can be made large and the elongated hole 10B can be easily aligned with the screw hole M of the mounting location T.

[0029] Thus, according to the sensor 1 of the embodiment of the present invention, in the sensor 1 in which the sensor cover 3 containing the sensing unit main body 2 inside is attached to the attachment point T with a fixing device, the work of storing the lead wire 23 and the work of attaching it with the fixing device can be carried out smoothly, thereby improving workability.

[0030] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention also includes design changes within the scope of the present invention. Furthermore, the above-described embodiments can be combined by utilizing each other's technologies as long as there are no particular contradictions or problems in their purposes, configurations, etc. [Explanation of symbols]

[0031] 1: Sensor, 2: Sensor body, 20: sensing part, 21: circuit board, 22: main body, 23: lead wire 24: Main body cover, 24A: Engaged part 3: Sensor cover, 3A: Bottom, 3B: Opening, 3C: Outer edge, 3D: Protective rib, 3E: Tool insertion hole, 4: Protective frame, 5: Support frame, 5A: Support part, 5B: Engagement part, 10: Mounting hole, 10A, 10B: Long hole, 11: Hook piece, 12: Screw insertion guide, 13: Screw head contact part, N: screw (fixture), Nt: screw head, T: Mounting point, T1: Wiring hole, L: Straight line, S1, S2: Storage space, M: Screw hole, K: Existing wiring, J: Connection part

Claims

[Claim 1] A sensor comprising a sensor unit body having a sensor unit that senses a change in a state inside a room and a circuit board on which the sensor unit is mounted, and a sensor cover that is attached to a mounting location inside the room with a fixture and that houses the sensor unit body therein, the sensor cover includes a bottom portion supporting the sensor body, and an opening portion provided at the center of the bottom portion and facing the sensor body; a pair of mounting holes are provided in the bottom portion along a straight line with the opening therebetween, and the longitudinal direction of the sensing unit main body, which is elongated in one direction, is arranged along the straight line; A lead wire is led out in a longitudinal direction along the outside of the sensing unit body from a side surface in a longitudinal direction of the sensing unit body, The sensor is characterized in that the sensing unit main body is located inside the opening in a plan view.

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