JP4790492B2 - Fire detector - Google Patents

Description

  The present invention relates to a fire detector fixed to a ceiling or the like, and more particularly to a directly attached type fire detector in which a main body is screwed to a ceiling or the like.

  The body of the direct-attached type fire detector has a pair of screw mounting holes that are symmetrical to each other. By inserting mounting screws into these screw mounting holes, the main body can be directly fixed to the ceiling or the like. Yes.

  However, since the attachment work is screwed while manually pressing the main body against the ceiling, it is a difficult work with an unstable posture and the work efficiency is not good.

  Therefore, it is conceivable to use the following sensor mounting device for the direct-attached type fire detector. That is, a sensor comprising: a mounting screw having a pointed screw part; and a sensor in which a holding piece for holding the screw part is projected on the inner periphery of a hole having a diameter smaller than the diameter of the head of the mounting screw. (For example, refer to Patent Document 1).

  In this attachment device, the screw portion of the first attachment screw is inserted into the first hole of the long hole of the sensor base, and the attachment screw is held by the holding piece of the hole, and sensing is performed in this state. Hold the sensor base at a predetermined position on the ceiling with one hand, screw the mounting screw with the other hand to temporarily fix it, rotate the sensor base, and place the head of the mounting screw into the slot with the long hole. The sensor base is attached to the position of the hole 2 by further screwing a mounting screw and press-contacting the ceiling and the head of the second mounting screw.

Japanese Utility Model Publication No. 58-38470

  When using the sensor mounting device of the conventional example, when holding the mounting screw on the sensor base holding piece, it is necessary to arrange it so that the two mounting screws can be securely screwed to the ceiling surface. Work requires accuracy. Also, in this conventional example, the sensor base is first screwed into the predetermined position on the ceiling with two mounting screws, so even if it is necessary to fine-tune the position of the fire detector, It is difficult to make adjustments.

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to easily attach a directly attached type fire detector to a desired position.

The present invention provides a fire sensor comprising: a main body fixed to a ceiling with a mounting screw; a pair of substantially elongated screw mounting holes provided in the main body; and a peripheral wall of the screw mounting hole ; A notch formed in one of the peripheral walls into which the head of the mounting screw is inserted , and provided in the vicinity of the notch, and is guided to the screw mounting hole via the notch. The guide portion comprises a substantially divergent left-right direction regulating member that regulates a horizontal position, and a substantially convex up-down direction regulating member that regulates a vertical position. parts, the said head of the fixed mounting screw to the ceiling to fix the lateral and vertical displacement, characterized that you guided to the threaded mounting hole.

The main body of the present invention includes a lead wire clamping portion including a side wall and a peripheral wall of a screw mounting hole.

  Since the present invention is configured as described above, after inserting the head of one mounting screw temporarily fixed to the ceiling or the like into the cutout portion, the main body is slid, and the mounting screw is inserted into the screw mounting hole. Can be positioned and tightened. In this manner, the position of the main body can be finely adjusted with the main body temporarily fixed to one mounting screw, and the other mounting screws can be screwed and fixed. Therefore, the sensor can be easily attached at a desired position, and work efficiency is improved. Further, since the guide portion is provided, the mounting screw can be smoothly guided to the mounting hole. Therefore, speeding up of the attachment work can be achieved.

A first embodiment of the present invention will be described with reference to FIGS.
The main body 1 of the fire detector F includes a cylindrical side wall 3, and screw mounting holes 5 and 6 are provided inside thereof. These screw mounting holes 5 and 6 are substantially elongated holes arranged symmetrically with respect to a point, and are located on a straight line (diameter) passing through the center of the main body 1.

  The widths of the mounting holes 5 and 6 are formed larger than the diameters of the screw portions 8a and 9a of the mounting screws 8 and 9, and smaller than the diameters of the head portions 8a and 9b. In addition, the shape and size of the screw mounting hole are appropriately selected as necessary.

  A notch portion 11 is formed on the peripheral wall 5 a on the tip end portion 5 d side of the screw mounting hole 5, that is, on the center side of the main body 1. Therefore, the screw mounting hole 5 has a U shape that opens toward the center of the main body 1. The notch 11 is formed in a size that allows the head 8b of the mounting screw 8 to be inserted. A guide portion 13 is provided in the vicinity of the notch portion 11. The guide portion 13 includes a left-right direction restricting member 13a for restricting a horizontal position and a vertical direction restricting member 13b for restricting a vertical position.

  In the figure, 5b is a reinforcing protrusion of the screw mounting hole 5, and 31 is a holding portion of the lead wire 17, which is formed between the holding piece 3a of the side wall 3 and the peripheral wall 5a. Reference numeral 32 denotes a seal portion that covers the printed circuit board 19, and the thermistor 23 and the lead wire 17 are fixed to the printed circuit board 19 as shown in FIG. 4. The sandwiching portion 31 varies in width or the like depending on the outer diameter or the number of the lead wires 17. Further, the lead wire is housed inside the side wall 3 of the main body 1 until just before the construction.

Next, the operation of the present embodiment will be described.
As shown in FIG. 4, the mounting screw 8 is temporarily fixed at a predetermined location near the through hole 27 of the ceiling 25. At this time, the distance between the bottom surface 8c of the head 8b and the ceiling 25 is slightly larger than the height of the peripheral wall 5a.

The lead wire 29 disposed on the back side of the ceiling 25 and the lead wire 17 of the fire detector F are pressed together to be integrated.
Next, the main body 1 of the fire detector F is held by hand, and the head 8 b of the mounting screw 8 is brought close to the notch 11. At this time, the notch portion 11 may be sized so that the position of the mounting screw 8 can be confirmed from below. Then, after inserting the notch 11 into the head 8b of the mounting screw 8, the main body 1 is pulled toward the front.

    Then, the mounting screw 8 is in contact with the left-right direction regulating member 13a having the outer diameter of the head 8b having a substantially divergent shape, and the moving direction is regulated, and the vertical direction regulation in which the top of the head 8b has a substantially convex shape. The movement direction is regulated by contacting the member 13b.

    Accordingly, since the mounting screw 8 can be easily corrected in the left and right direction and the vertical direction by the guide portion 13, it is guided to the screw mounting hole 5 via the notch portion 11, and the bottom surface 8c of the head portion 8b is connected to the peripheral wall. It moves along the locking end surface 5e of 5a. Further, in accordance with the position of the lower end of the notch 11, the spread angle of the left / right direction regulating member 13a and the inclination angle of the ceiling surface of the up / down direction regulating member 13b may be set.

  If it does so, the rear-end part 5c of the female screw attachment hole 5 will contact | abut to this attachment screw 8, and it cannot move any more. At this time, since the main body 1 is in a cantilever state, it does not fall even if the hand is released from the main body 1.

  Next, if necessary, the main body 1 is moved or rotated around the mounting screw 8 to adjust the fixing position of the fire detector F. When the desired position is determined, the mounting screw 9 is inserted into the screw mounting hole 6 and fixed. Thereafter, the mounting screw 8 is tightened to a state shown by a one-dot chain line in FIG. 4, and the mounting operation is completed.

A second embodiment of the present invention will be described with reference to FIG. 5. The same reference numerals as those in FIGS. 1 to 4 have the same names and functions.
The difference between this embodiment and the first embodiment is that notch portions 11 and 38 are provided in both screw mounting holes 5 and 35, respectively.

The cutout portion 38 of the screw attachment hole 35 is formed by cutting out the peripheral wall 35a on the rear end portion 35c side of the screw attachment hole 35. In this way, when attaching the main body 1 to the ceiling, The side wall 3 can be used as a guide part, and the lead wire 17 does not get in the way when the mounting screw 8 is inserted into the notch part 38.
The notch 38 may be provided on the tip 35d side of the screw mounting hole 35.

The embodiment of the present invention is not limited to the above. For example, the locking end surface 5e of the peripheral wall 5a may be formed so as to become gradually higher toward the back side of the screw mounting hole 5, and may be a tapered surface. . In this way, when the main body 1 is moved while the screw portion 8a of the mounting screw 8 is positioned in the screw mounting hole 5, the bottom surface 8c of the head 8b of the mounting screw 8 gradually approaches the locking end surface 5e, Finally, it abuts and is fixed.
Further, the present invention can be applied not only to a fire sensor but also to a sensor base.

It is a top view which shows 1st Embodiment of this invention. It is a bottom view. It is a principal part expansion perspective view of FIG. It is sectional drawing which shows the attachment process of a fire detector. It is a top view which shows 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 3 Side wall 5 Screw mounting hole 6 Screw mounting hole 8 Mounting screw 9 Mounting screw 11 Notch part 13 Guide part 25 Ceiling F Fire detector

Claims (2)

A fire sensor comprising: a main body fixed to a ceiling with a mounting screw; a pair of substantially elongated screw mounting holes provided in the main body; and a peripheral wall of the screw mounting hole ;
Formed in either one of at least said peripheral wall, said a notch which head is inserted in the mounting screw, provided in the vicinity of the notch, by way of the notch, the screw mounting hole And a guide part that guides to
The guide portion is composed of a substantially divergent left and right direction regulating member that regulates a horizontal position, and a substantially convex up and down direction regulating member that regulates a vertical position,
The fire detector according to claim 1, wherein the guide portion guides the head of the mounting screw fixed to the ceiling to the screw mounting hole by correcting a lateral and vertical shift . Before SL body, side walls and a fire detector according to claim 1, characterized in that it comprises a lead wire clamping portion comprising a peripheral wall of the screw mounting holes.

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