JP2000020845A - Ceiling embedded fire sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a fire sensor inexpensive, easy to install, apparently thin, and nice-looking. SOLUTION: This sensor 1 is provided with a base 2 in which a cylindrical part 20 having a top plate is inserted into a mounting hole formed at a ceiling plate, and a corner-shaped part 20b formed at the peripheral edge of the lower opening is mounted so as to be abutted to the ceiling plate at the peripheral edge of the mounting hole, and a head 3 engaged in the base from the lower opening so as to be freely attachable and detachable. In this case, this sensor 1 is provided with a tie plate spring 25 extended from the side face of the cylindrical part 2 to almost the diametral direction viewed on a plane so as to be made bendable from the neighborhood of a root 25a to almost the upper direction viewed from the side face within an elastic limit, and non-slip working is performed on the ceiling plate abutted part of a flange part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a ceiling-mounted fire detector which is embedded in a mounting hole formed in a ceiling plate.

[0002]

2. Description of the Related Art FIG. 6 is a partial cross-sectional side view of a main part showing a conventional ceiling-mounted fire detector mounted on a ceiling panel.
Is an explanatory view showing a procedure for attaching a conventional ceiling embedded fire detector to a ceiling panel, and FIG. 8 is an explanatory view showing a procedure for attaching a conventional ceiling embedded fire detector to an embedded box.

As shown in FIGS. 6 and 7, a conventional ceiling-mounted fire detector 1 includes a base 2, a head 3, and a plate 4. In FIGS. 6 and 7, A is a ceiling plate.

[0004] The base 2 includes a cylindrical part 20, a printed circuit board block 21, a base lid 22, a clamp 23,
23. Yes Tezutsu shaped portion 20 is intended cylindrical, in the vicinity of the lower opening 20 _a provided with a flanged portion 20 _b, is upwardly provided with a recess 20 _c. The flange portion 20 _b,
Hole 20 _b1 for penetrating the screw 23 _a is drilled.

[0005] printed circuit board blocks 21, intended to be attached to the closed Tezutsu shaped portion 20 upper recess 20 _c of, various electronic parts 21 _a and indication lamp 21 _b are mounted on the printed circuit board 21 _c. The base lid 22 is a disk lid having _a quick connection terminal 22 _a for connecting an electric wire (not shown), and covers the upper concave portion 20 _c of the heavenly cylindrical portion 20 by housing the printed circuit board 21 _c. I do.

[0006] scissors fitting 23 is configured to include a long screw 23 _a, and the pinching plates 23 _b, and a coil spring 23 _c.
Screw 23 _a is passed through the coil spring 23 _c with passing from the bottom of the hole 20 _b1 provided on the flange portion 20 _b, the screw holes (FIG tip of the screw 23 _a bored in the offset position of the pinching plates 23 _b (Not shown). Coil spring 23 _c is pinching plates 23 have been compressed by the _b and flanged portion 20 _b, it acts a biasing force to push the pinching plate 23 _b upwards.

The head 3 has a substantially cylindrical shape in which an optical chamber for detecting smoke, for example, is formed. The outer diameter of the head 3 is defined by the lower opening 20 _{a of the} cylindrical portion 20 of the base 2. It has dimensions that allow it to be loosely inserted and has an inverted L-shaped locking claw 3 on the upper surface
0 and 30 are provided. Plate 4 has screws _23a
It has a round plate shape slightly curved upward, has a rising portion 41 formed on the outer peripheral edge, and an insertion hole 42 through which the head 3 can be inserted is formed in the center. The plate 4 has an insertion hole 42 located immediately below the lower opening 20 _a of the cylindrical portion 20 and the head 3.
Attaching to the base 2 so as to cover the flange portion 20 _b of,
A known attachment mechanism is provided.

A conventional ceiling-mounted fire detector as described above.
The procedure for attaching the device 1 to the ceiling plate will be described with reference to FIG.
First, on the ceiling plate A, the cannulated tubular portion 20 of the base 2 is loosely inserted.
With the collar 20_bLarge enough to touch the periphery
Mounting hole A₁Drilling. And the upper part of the base 2
The mounting hole A from below.₁Into the pinch plate 23_b,23 _b
Is located above the ceiling plate A.

[0009] After that, when rotated in the direction of tightening the screw 23 _a, 23 _a respectively, pinching plates 23 _b, 23 _b is lowered while compressing the coil spring 23 _c, 23 _c, the end, pinching plate 23 _{b ,} sandwiching the ceiling plate a of the peripheral edge of the attachment hole a ₁ between 23 _b and the flanged portion 20 _b, the base 2 is fixed to the ceiling plate a.
Then, while positioning the plate 4, the plate 4 is pressed against the flange 20 _b of the base 2, and the plate 4 is
Attach below. Then, each of the head of the blindfold of the screw 23 _a, 23 a is performed.

[0010] Finally, the locking claws 30, 30 of the head 3 in the above, by inserting the head 3 from the lower opening 20 _a chromatic Tezutsu shaped portion 20 of the base 2 to rotate the head 3. Then
The locking claws 30, 30 are engaged with the connection fittings 24, 24 provided on the base 2, and the locking claws 30, 30 are connected to the connection fitting 2.
The base 2 and the head 3 are electrically connected to each other via the bases 4 and 24. In this manner, the installation of the ceiling embedded fire detector 1 is completed.

[0011] The procedure for mounting to the ceiling plate has been described above. Next, the procedure for mounting to the embedded box embedded in the concrete ceiling will be described with reference to FIG. In FIG. 8, C is concrete and B is an embedding box embedded in concrete C. In concrete C in front of the opening of the embedding box B,
An opening having a size substantially matching the opening of the embedding box B is opened.

As shown in FIG. 8, the embedded ceiling fire detector 1 attached to the embedded box B is different from the embedded ceiling fire detector 1 attached to the ceiling panel A described above.
In this configuration, the holding plates _{23b, 23b} and the coil springs _{23c, 23c} are not provided, and the screws _{23a, 23a} are shortened. In the opening of the embedded box B, a screw hole B ₁₁ for attaching a switch or other electric equipment is provided.
Ears B _1, B ₁ with a is formed.

[0013] In the ceiling-mounted fire detector 1 attached to such an embedded box B, the screws _23a, 23 are used.
_a through the holes 20 _b1 , 20 _b1 provided in the flange portion 20 _b from below, and insert the tips of the screws 23 _a, 23 _a into the screw holes B ₁₁ of the ears B _1, B ₁ of the embedding box B. , B ₁₁
To fix the fire sensor 1 to the embedded box B. Note that the subsequent procedure is the same as the case where the embedded ceiling fire detector is attached to the ceiling panel A, and thus the description is omitted.

[0014]

However, in the conventional ceiling-mounted type fire detector 1 as described above, the number of parts of the base 2 is large, and assembling cost and management cost are increased and the cost is high. Moreover, for attachment to the ceiling plate A, the screw 23 _a, bad fastening and fitting takes time workability of the plate 4 of 23 _a. Furthermore, the flange-shaped portion and around 20 _b of the base 2, even though the flange portion 20 _b, the screw 23 _a, 23 _a of the head, is thicker appearance to the eye is three-tiered plate 4, poor, thin There was a problem that it was difficult to convert.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an excellent ceiling which is low in assembling cost and management cost, has good workability, is thin and looks good, and has a good appearance. An object of the present invention is to provide an embedded fire detector.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to the invention as set forth in claim 1, wherein a ceiling-shaped cylindrical portion is inserted into a mounting hole formed in a ceiling plate, A ceiling embedded type fire detector including a base for mounting a flange-shaped portion formed on the periphery of an opening so as to abut against a ceiling plate on the periphery of the mounting hole, and a head detachably engaged in the base from the lower opening. A pinch leaf spring projecting from the side surface of the cylindrical portion in a substantially diametrical direction in a plan view and bendable from the vicinity of the base to substantially upward in a side view from the vicinity of the base within an elastic limit, and abutting the ceiling plate of the flange portion. It is characterized in that the part has been subjected to non-slip processing.

According to the second aspect of the present invention, a fitting step having a diameter smaller than an outer diameter of the flange is formed on the flange of the base, and the fitting step fits into the head. A fitting collar is formed.

According to a third aspect of the present invention, a flathead screw insertion hole is provided in the flange portion of the base for attachment to the embedding box.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a ceiling-mounted fire detector according to the present invention will be described below in detail with reference to FIGS. FIG. 1 is a view showing a ceiling-mounted fire detector, in which FIG. 1 (a) is a partially broken side view and FIG. 1 (b) is a bottom view. 2A and 2B are views showing a non-slip process performed on a ceiling plate contact portion of a flange portion of a base, wherein FIG. 2A is a partial plan view, and FIG. is there. FIG.
FIG. 2 is a partial cross-sectional side view showing a main part of a state where the embedded ceiling fire detector is attached to a ceiling plate. FIG. 4 is an explanatory view showing a procedure for mounting the ceiling-mounted fire detector on a ceiling panel. FIG. 4 (a) is a cross-sectional side view showing the mounting of a base to the ceiling panel, and FIG. It is a principal part partial cross-sectional side view which shows attachment of the head to the base attached to the ceiling board. FIG. 5 is an explanatory view showing a procedure when the ceiling embedded fire detector is attached to the embedded box.

In FIGS. 1 to 5, the same reference numerals are given to the same parts as those of the embedded ceiling type fire detector described with reference to FIGS. 6 to 8 in the related art.

As shown in FIGS. 1 to 4, the ceiling embedded fire detector 1 includes a base 2 and a head 3. The base 2 includes a cylindrical portion 20, a printed circuit board block 21, a base lid 22, and a leaf spring 25. Yes Tezutsu shaped portion 20 is intended cylindrical, the peripheral edge of the lower opening 20 _a provided with a flanged portion 20 _b, is upwardly provided with a recess 20 _c. The lower surface of the flange portion 20 _b is formed Hamagodan portion 20 _c, countersunk screw insertion hole 20 _c1, 20 _c1 for the passage of countersunk screws are drilled in the Hamagodan portion 20 _c.

The printed circuit board blocks 21, intended to be attached to the closed Tezutsu shaped portion 20 upper recess 20 _c of, various electronic parts 21 _a and indication lamp 21 _b are mounted on the printed circuit board 21 _c. The base lid 22 is a disk lid having _a quick connection terminal 22 _a for connecting an electric wire (not shown), and a printed circuit board 21 _c is housed in the upper concave portion 20 _c of the heavenly tubular portion 20. I do.

The sandwiching leaf spring 25 is a band-like highly elastic metal material having a width of about 10 mm, and has a shape as shown in FIG. 1 in a free state. That is, the pinch leaf spring 25
Includes a first bent portion 25 _a and a second bent portion 25 _b, has a shape similar to Z-shape having three sides. Sides in close contact with the outer surface of the pinching plate spring 25 closed Tezutsu shaped portion 20 of the base 2 of fixed by a suitable method such as riveting or screwing, the first bent portion 25 _a is a flanged portion 20 _b It is made to substantially abut the root. The second bent portion 25 _b is
Located outside of the flange portion 20 _b in a plan view.

The first bent portion 2 of the three sides of the
5 _a and the side is the longest between the second bent portion 25 _b, the first
Of the bent portion 25 _a closed Tezutsu portion in the side of the side or base 2 2
0 is the next longer side, and the second bent portion 25
_The side on the _b side is the shortest. First bent portion 2 of sandwiching leaf spring 25
5 angle _a is smaller than 90 degrees, pinching plate spring 25
The angle of the second bent portion 25 _b of which is greater than 90 degrees. Shortest side of the distal end of the second bent portion 25 _b side,
Extended surface of the surface abutting the ceiling plate A of the flange portion 20 _b of the base 2 and have been so substantially matches are as the base 2 can also install a thin ceiling board A.

Further, the flange-shaped portion of the base 2 20 _b of the ceiling plate A
As shown in FIGS. 2 (a) and 2 (b), many triangular mountain-shaped non-slip ribs _{20b2 which} are provided radially and correspond to anti-slip processing are provided on the surface which comes into contact with. .
The head 3 has a substantially cylindrical shape in which an optical chamber for detecting smoke is formed, for example, and has a ring-shaped fitting flange 31 formed in an intermediate portion. The fitting flange 31 corresponds to a plate of a conventional ceiling-mounted fire detector, and includes countersunk screw insertion holes 20 _c1 , 20 _c1 formed in a fitting step 20 _c on the lower surface of the flange 20 _b. It is for blindfolding. Head 3
The outer diameter of the cylindrical portion is set to a size that allows the cylindrical portion 20 of the base 2 to be loosely inserted through the lower opening 20 _a of the cylindrical portion 20. Outer diameter of the ring-shaped Hamagotsuba 31 of the head 3 is substantially made equal to the inner diameter of Hamagodan portion 20 _c formed on the lower surface of the flange portion 20 _b.
The thickness of the ring-shaped fitting flange 31 of the head 3 is
step height of Hamagodan portion 20 _c formed on the lower surface of _b and is substantially equal. Further, on the upper surface of the head 3, inverted L-shaped locking claws 30, 30 are provided.

The ceiling-mounted fire detector 1 as described above
The procedure for attaching the well to the well plate will be described with reference to FIG. Sand
First, on the ceiling plate A, the heavenly cylindrical portion 20 of the base 2 is loosely mounted.
Insertable and collar 20_bIs in contact with the periphery
Mounting hole A of size₁Drilling. Then, FIG.
As shown in FIG.
2 and press it against the side of the cylindrical portion 20 and in the free state
The sandwiched leaf springs 25, 25 that have been spread
The upper part of the mounting hole A and the leaf springs 25 ₁Insert into
I do.

[0027] Then, respective tips of the scissors leaf spring 25, 25, loosening the hand that has narrowed the pinching plates springs 25, 25 at projecting to the back side through the mounting holes A _1,
Since pinching plate springs 25 and 25 have narrowed the first bent portion 25 _a, 25 _a as a fulcrum is to return to the free state, the force to lift the result base 2 upwardly as acts, pinching plate sandwiching the ceiling plate a of the peripheral edge of the attachment hole a ₁ in the spring 25 and the flanged portion 20 _b, the base 2 is fixed to the ceiling plate a.

[0028] Then, the locking claws 30, 30 of the head 3 in the above, from the lower opening 20 _a chromatic Tezutsu shaped portion 20 of the base 2 by inserting the head 3, the head 3 ring-shaped Hamagotsuba 3
1 fitted to the Hamagodan portion 20 _c of the flange portion 20 _b of the base 2 to rotate the head 3 while pressing the Hamagotsuba 31 to Hamagodan portion 20 _c.

[0029] At this time, the surface contacting the ceiling plate A of the flange portion 20 _b of the base 2, as shown in FIG. 2 (a) and 2 (b), provided radially corresponding to Rubberized Since many triangular mountain-shaped antiskid ribs 20 _b2 are provided, the base 2 does not rotate with the head 3,
The locking claws 30, 30 can be smoothly engaged with the connection fittings 24, 24 provided on the base 2, so that the locking claws 30, 30 are provided.
The base 2 and the head 3 are electrically connected to each other via the connection fittings 24 and 24. In this way, the installation of the embedded ceiling fire detector 1 is completed, and the embedded ceiling fire detector 1 is attached to the ceiling plate A in a state as shown in FIG.

The procedure for mounting on a ceiling plate has been described above. Next, the procedure for mounting on a buried box embedded in a concrete ceiling will be described with reference to FIG. In FIG. 5, C is concrete and B is an embedding box embedded in concrete C. In concrete C in front of the opening of the embedding box B,
An opening having a size substantially matching the opening of the embedding box B is opened.

As shown in FIG. 5, the embedded ceiling fire detector 1 attached to the embedded box B is different from the embedded ceiling fire detector 1 attached to the ceiling panel A described above.
Instead without a pinching plate springs 25, 25, passed through the countersunk screw insertion hole 20 _c1, 20 _c1 formed in Hamagodan portion 20 _c of the lower surface of the flange portion 20 _b of the base 2, countersunk screws 25 , 25
It is a configuration provided with. The opening of the embedded box B, for attaching such as switches and other electrical equipment, the ear portion B _1, B ₁ with a screw hole B ₁₁ is formed.

In the ceiling embedded type fire detector 1 attached to the individual box B, the flathead screws 25, 2
5 are respectively inserted from below into flathead screw insertion holes 20 _c1 , 20 _c1 formed in the fitting step 20 _c on the lower surface of the flange 20 _b , and the tips of the flathead screws 25, 25 are embedded in the ears of the box B. The ceiling embedded fire detector 1 is fixed to the embedded box B by screwing and screwing into the respective screw holes B ₁₁ , B ₁₁ of B _1, B ₁ .

Then, similarly to the case where the ceiling embedded type fire detector 1 is attached to the ceiling plate A, the locking claws 3
The head 3 is inserted from the lower opening 20 _a of the cylindrical portion 20 of the base 2 with the 0, 30 facing upward, and the ring-shaped fitting flange 31 of the head 3 is connected to the flange 20 _b of the base 2. Fitting step 2
0 fitted into _c, to rotate the head 3 while pressing the Hamagotsuba 31 to Hamagodan portion 20 _c.

Then, the locking claws 30, 30 are engaged with the connection fittings 24, 24 provided on the base 2, and the locking claws 3
The base 2 and the head 3 are electrically connected to each other via the connection fittings 24 and 24. In this way, the mounting of the ceiling embedded fire detector 1 to the embedded box B embedded in the concrete ceiling is completed.

[0035]

According to the first aspect of the present invention, each of the leaf springs is bent upward to be narrowed, the upper portion of the base is inserted into the mounting hole provided in the ceiling plate, and the tip of the leaf spring is attached to the ceiling. Protruding to the back side of the plate and removing the force that narrowed the sandwich leaf spring inevitably lifts the base upward,
The base plate can be easily fixed to the ceiling plate without tightening the screws by clamping the ceiling plate around the periphery of the mounting hole by the sandwiching leaf spring and the flange portion of the base. Non-slip processing is applied to the ceiling plate contact part, so when inserting the head into the base and rotating it to attach the head to the base, the base does not rotate with the head, so it should be attached smoothly In addition, there is an effect that it is possible to provide an inexpensive ceiling-mounted fire detector that is inexpensive and excellent, requiring no screws and coil springs as in the conventional art, and having a small number of components.

According to the second aspect of the invention, in addition to the effect of the first aspect, the fitting flange of the head is fitted into the fitting step formed on the flange of the base. It is effective in providing an excellent ceiling-mounted fire detector that is thin and has a good appearance.

According to the third aspect of the present invention, in addition to the effect of the second aspect, when mounting to the embedded box, the leaf spring is removed from the base,
The base can be fixed to the embedding box by passing the flathead screw through the flathead screw insertion hole formed in the fitting step part of the flange of the base, and the base can be fixed to the embedded box, and the head of the flathead screw sinks into the flathead screw insertion hole. An excellent ceiling that allows the fitting flange of the head to fit into the fitting step formed in the flange-shaped part of the above, and can be made thin and visually appealing even when attached to an embedded box embedded in a concrete ceiling. This has the effect of providing an embedded fire detector.

[Brief description of the drawings]

FIG. 1 is a diagram showing a ceiling-embedded fire detector according to an embodiment of the present invention.

FIG. 2 is a view showing a non-slip process applied to a ceiling plate contact portion of a flange portion of a base of the ceiling-embedded fire detector.

FIG. 3 is a partial cross-sectional side view showing a state where the ceiling-mounted fire detector is mounted on a ceiling plate.

FIG. 4 is an explanatory view showing a procedure when attaching the above-described ceiling-embedded fire detector to a ceiling panel.

FIG. 5 is an explanatory view showing a procedure for mounting the ceiling embedded fire detector to an embedded box.

FIG. 6 is a partial cross-sectional side view showing a main part of a conventional ceiling-mounted fire detector attached to a ceiling plate.

FIG. 7 is an explanatory view showing a procedure for attaching a conventional ceiling embedded fire detector to a ceiling panel.

FIG. 8 is an explanatory view showing a procedure for attaching a conventional ceiling embedded fire detector to an embedded box.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Embedded ceiling fire detector 2 Base 20 Cylindrical part 20 _a Lower opening 20 _b Flange part 20 _b2 Non-slip processing 20 _c Fitting step part 20 _c1 Countersunk screw insertion hole 25 Nipping leaf spring 25 _a Root 3 head 31 Hamagotsuba A ceiling board A ₁ mounting hole B embedded box

Claims (3)

[Claims] 1. A base for inserting a cantilevered cylindrical portion into a mounting hole formed in a ceiling plate and mounting a flange-shaped portion formed on a peripheral edge of a lower opening so as to contact the ceiling plate on a peripheral edge of the mounting hole; In a ceiling embedded type fire detector having a head detachably attached to the base from the opening, the fire detector protrudes from a side surface of the hollow cylindrical portion in a substantially diametric direction in a plan view and substantially upwards from a vicinity of a base in a side view. A ceiling-embedded fire detector characterized in that a sandwich leaf spring that can be bent within the elastic limit is provided, and a non-slip process is applied to a contact portion of the flange-shaped portion with the ceiling plate. 2. A fitting step having a smaller diameter than the outer diameter of the flange is formed on the flange of the base, and a fitting flange is formed on the head so as to fit in the fitting step. The fire sensor embedded in a ceiling according to claim 1. 3. An embedded ceiling fire detector according to claim 2, wherein a countersunk screw insertion hole is provided in the flange-shaped portion of the base for attachment to an embedded box.