Sensor-based

Abstract

To provide a sensor base that allows easy and reliable detaching and attaching of a fire sensor without involving rotation of the sensor base even when there is a rotational operation of the fire sensor at the time of detaching and attaching the fire sensor to the sensor base installed on an attachment surface.SOLUTION: A sensor base 1 is installed on an attachment surface 2 having an opening and is used for attaching a fire sensor. The sensor base includes: a main body part 5 to which the fire sensor is detachably mounted; a flange part 4 overhanging in an outer circumferential direction from the main body part 5; and a packing 7 which is provided on a back surface of the flange part 4 and elastically deforms. The sensor base 1 is installed so as to bring the flange part 4 into press-contact with the attachment surface 2 via the packing 7.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a detector base that is installed on a mounting surface such as a ceiling material or a wall material and that is used to mount a fire detector. [Background technology]

[0002] Fire detectors, which detect fires by detecting smoke, heat, flames, etc., are attached to a detector base and installed on, for example, a ceiling surface. There are two types of detector bases: recessed detector bases, in which part of the detector base is inserted into a mounting hole in the installation surface, and exposed detector bases, in which most of the detector base is exposed above the ceiling surface.

[0003] The present invention is directed to embedded types, and as an example of an embedded type, a "detector base" is disclosed in Patent Document 1. Specifically, as it states, "The detector 10 of this embodiment can be selectively attached to the wall surface of a building either by screwing using the screw insertion holes 11a of the mounting plate portion 11B, or by screwing using the screw insertion holes 11c and a mounting bracket" (see paragraph 0036 of Patent Document 1), an embedded type detector base is installed with the fire detector housing portion of the detector base embedded in the mounting surface such as a ceiling. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-067026 [Patent Document 2] Japanese Patent Application Publication No. 2020-154912 Summary of the Invention [Problem to be solved by the invention]

[0005] When attaching or detaching a fire detector to or from a detector base, the fire detector is rotated to engage terminals on the detector base with terminals on the fire detector. Some flush-mounted detector bases are not fastened with screws as in Patent Document 1, but are instead attached to the mounting surface of a ceiling or wall material by pressing the base against the backside of the mounting surface using a mounting bracket attached to the detector base (see Figure 1 in Patent Document 2). In the case of detector bases that use mounting brackets, the mounting surface and the detector base body are not fixed in position with screws or the like. Therefore, if the mounting brackets are not securely fastened to the mounting surface, the detector base will rotate simultaneously with the rotation of the fire detector when attaching or detaching, i.e., the detector will spin freely, resulting in issues such as time-consuming installation of the fire detector and insecure installation of the fire detector.

[0006] The present invention has been made to solve such problems, and aims to provide a detector base that allows a fire detector to be attached quickly and reliably by preventing the detector base from rotating when the fire detector is attached or detached from the detector base, i.e., preventing the detector base from spinning freely. [Means for solving the problem]

[0007] (1) The detector base according to the present invention is installed on an installation surface having an opening for mounting a fire detector, The fire detector is detachably attached to the fire detector, and the fire detector has a cylindrical main body, a flange portion that protrudes outward from the main body, and a seal portion that is provided on the back surface of the flange and that is elastically deformable, The sensor base is characterized in that it is installed so that the flange is pressed against the installation surface via a seal portion. (2) In addition, in the above (1), the seal portion is formed in an annular shape. [Effects of the Invention]

[0008] In the present invention, when the detector base is installed on a mounting surface such as a ceiling or wall material, the seal portion provided on the back side of the flange portion of the detector base elastically deforms and is pressed against the mounting surface, causing friction between the mounting surface and the seal portion, making it difficult for the mounting position of the detector base to move.This prevents the detector base from rotating along with the rotation of the fire detector when attaching or detaching the fire detector, so the fire detector can be attached and detached easily and reliably. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing an installation state of a fire detector base according to an embodiment of the present invention; [Figure 2] FIG. 2 is a rear view of the fire detector base according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] As shown in Figures 1 and 2, the detector base 1 of this embodiment is installed on a mounting surface 2 such as a ceiling or wall material with an opening, for mounting a fire detector, and has a main body 5 to which the fire detector is detachably attached, a flange 4 that extends outward from the main body 5, and a gasket 7 that is an elastically deformable sealing part that is provided on the back of the flange 4, and the detector base 1 is installed so that the flange 4 is pressed against the mounting surface 2 via the gasket 7.

[0011] In the present invention, terms such as "front" and "back" indicating the front and rear directions are used to refer to the side facing the base body 3 on which the fire detector is attached from the installation surface when the detector base 1 is installed. For example, when the detector base 1 is installed on a ceiling as the installation surface 2, the downward direction is used as the "front" direction.

[0012] In this embodiment, the sensor base 1 is installed on the ceiling, and the floor side is used as the "down" direction and the ceiling side is used as the "up" direction.

[0013] <Base body> The base body 3 has a cylindrical outer shape and includes a main body portion 5 to which a fire detector is detachably attached from below, and a flange portion 4 that extends outward from the lower edge of the main body portion 5.

[0014] Main body The main body 5 has a cylindrical shape with a bottom that is open in the center. A blade receiving metal fitting (not shown) that engages with a blade fitting provided on the fire detector is provided on the inner surface of the bottom of the main body 5 (the lower surface when installed). In addition, a pair of mounting metal fittings 6 and metal fitting installation parts for attaching the detector base 1 to the installation surface 2 are provided on the outer surface of the bottom of the main body 5 (the upper surface when installed) at positions facing each other across the opening.

[0015] 《Tsubabe》 The flange 4 has the function of clamping both end edges of an installation opening (not shown) provided in the mounting surface 2 in cooperation with the mounting bracket 6 when the fire detector mounting base 1 is attached to the mounting surface 2. The flange 4 has a circular outer periphery, and is set to have a larger diameter than the opening provided in the mounting surface 2. A plurality of ribs are provided radially on the upper surface of the flange 4 to increase the rigidity of the flange 4, and a thin annular wall 4a is provided on the outer periphery.

[0016] <Sealing part> In this embodiment, the seal corresponds to packing 7. The packing 7 is formed in an annular shape using a non-slip, elastically deformable material and is circumferentially attached to the upper surface of the flange 4 along the annular wall 4a. The thickness of the packing 7, in other words, the height of the packing 7 when attached to the flange 4, is slightly higher than the height of the annular wall 4a, and is formed so that it is approximately the same height as the annular wall 4a when pressed against the sensor base 1 during attachment. The width of the packing 7 needs to ensure a sufficient contact area so that frictional resistance between the mounting surface 2 and the packing 7 is generated to the extent that the sensor base 1 is not easily moved when the sensor base 1 is attached to the mounting surface 2. For example, the width of the packing 7 may be set to 3 to 4 times the width of the annular wall 4a. In this embodiment, the packing 7 is described as being made of rubber, but is not limited to this and may be made of silicone or other material that provides a similar effect. Also, the packing 7 is placed on the upper surface of the flange 4, but it may be attached to the flange 4 as long as it is in close contact with the upper surface of the flange 4.

[0017] <Mounting bracket> The mounting bracket 6 is mounted on the base body 3 so that it stands upright with its base end as a fulcrum, in other words, so that it can tilt outward from an upright position relative to the base body 3 to a laid-down position, and attaches the base body 3 to the mounting surface 2 by clamping both end edges of the opening in the installation surface 2 from the rear direction in cooperation with the base body 3.

[0018] A method for installing the sensor base 1 of this embodiment configured as above when the installation surface is a ceiling will be described. First, an opening for installing the detector base 1 and fire detector is made in the mounting surface 2. The detector base 1 is inserted into the opening from below. At this time, the opening is made larger than the outer diameter of the main body 5 but smaller than the outer diameter of the flange 4, so when the main body 5 is inserted into the opening, the detector base 1 comes to rest at a position where the top surface of the flange 4 abuts against the mounting surface 2. Specifically, with the mounting brackets 6 standing upright, the main body 5 of the sensor base 1 is inserted into the opening and comes to rest in a position where the flange 4 abuts the mounting surface 2. In this stationary state, the mounting bracket screws (not shown) provided on the main body 5 are turned from below, and the mounting brackets 6 are moved downward so as to collapse in the outer circumferential direction, whereby the mounting surface 2 is clamped between the mounting brackets 6 and the flange 4. At this time, the packing 7 provided on the upper surface of the flange 4 is pressed and elastically deformed, so that the mounting surface 2 and the sensor base 1 come into close contact, and the sensor base 1 comes to rest in a position where it is difficult to move from its mounting position.

[0019] When attaching a fire detector to the detector base 1 installed on the mounting surface 2, the blade fittings on the fire detector are engaged with the blade receiving fittings on the main body 5. At this time, to engage the blade fittings with the blade receiving fittings, the fire detector is attached to the main body 5 while being rotated in a twisting motion. In conventional detector bases, only the width of the annular wall portion is in contact with the mounting surface, so the rotation of the fire detector when it is installed causes the detector base to slip, resulting in the detector base spinning freely. However, in the detector base 1 of this embodiment, the packing 7 is pressed against the mounting surface 2, increasing frictional resistance, making it difficult for the detector base to move from its installed position, preventing the detector base 1 from spinning freely when the fire detector is rotated when it is installed. [Explanation of symbols]

[0020] 1. Sensor base 2 Mounting surface 3 Base body 4. Tsuba 4a Annular wall 5 Main body 6 Mounting bracket 7. Packing

Claims

[Claim 1] A detector base for mounting a fire detector, the detector base being installed on a mounting surface having an opening, a cylindrical main body to which the fire detector is detachably attached; a flange portion that protrudes from the main body portion toward the outer periphery and has an annular wall portion provided on the outer periphery of the upper surface; a seal portion provided on an upper surface of the flange portion and elastically deforming; the width of the seal portion is 3 to 4 times the width of the annular wall portion; A sensor base characterized in that the flange is installed so as to be in pressure contact with the mounting surface via the seal portion.

Images