JP2530390Y2 - Fire detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector installed on a ceiling or the like, and more particularly, to a fire detector or a conductor connecting portion provided on a sensor base.

[0002]

2. Description of the Related Art Conventionally, when a fire detector is mounted on a ceiling surface, a connection screw screwed to a conductive metal fitting of a base is loosened by a mounting screw, and a power line or a signal line is formed between the screw and a receiver or a repeater. The sensor body is attached after the conductor connected to is sandwiched and tightened. In recent years, miniaturization and simplification of the sensor have been promoted, and the above-mentioned conductor connection portion is no exception.

The conductor connecting portion is usually provided inside a covered cylindrical base, and occupies most of the lid together with the outlet of the conductor. If the conductor connection portion is provided on the back surface of the base, that is, on the ceiling surface side, an outlet is not required, which is particularly convenient for an embedded base.

[0004]

However, if a conductive portion such as a conductor connection portion is provided on the back surface of the base, various inconveniences such as disconnection or short circuit due to water leakage or dust may be considered.
It cannot be used unless it is protected so that the conductive portion is not exposed.

[0005] In the case of a sensor which is not divided into a main body and a base, there is a sensor in which a lead wire connection portion is provided on the back surface thereof. However, a lead wire is pulled out from an internal electric circuit portion, and an external lead wire is taped. It is often troublesome.

[0006] Even in the case where a conductor connection portion is provided inside a normal base, it is safer to protect the conductor from water leakage and dust, etc. In particular, the conductor is sandwiched between the terminal plate and the locking spring. If so, it is important that the wire is easily broken at that part.

[0007] In view of the above circumstances, it is an object of the present invention to protect a conductor connecting portion of a fire detector and to easily attach and detach a conducting wire.

[0008] This invention is based on the fire detector
Fire with a conductor connection on the surface of the container base
In the sensor, the conductor connection portion is a terminal plate, and the terminal plate
A terminal spring having a locking piece and a contact piece for abutting and holding a conducting wire
And a mounting hole for the terminal plate and the terminal spring.
And the conductor connecting portion closes the mounting opening.
As shown, with a resin terminal cover with a conductor insertion hole
The above object is achieved by a fire detector characterized by being covered .

[0009] The conductor connecting portion is connected to a terminal plate or a terminal spring.
By covering with a terminal cover so that the opening is closed, water drops on the ceiling, etc. do not fall on the metal fittings, and dust does not accumulate on the metal fittings. Nor. Also, since the terminal cover is provided with a lead wire insertion hole and a release hole, without removing the terminal cover,
The conducting wire can be easily attached and detached.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. 1 is a ceiling plate and 2 is a ceiling hole. Reference numeral 3 denotes a base, which is resin-molded into a substantially closed cylindrical shape and fixed to the ceiling plate 1. Reference numeral 4 denotes a keyhole-shaped fixing hole.

Reference numeral 5 denotes a conductor connecting portion incorporated in the base 3 and is provided at four places on the back surface of the base 3. A square wall 7 having an inclined step 6 at a predetermined position of the base 3, an arc piece 8, and a mounting seat 9 having a screw hole are formed. 1
Reference numeral 0 denotes a resin-covered terminal cover having an unlocking hole 11 with a lid 11a used for unlocking, 12 a fixing screw, 13 a terminal spring , and 17 a terminal plate. Mounting port 10a is a terminal cover
10 is in the open state before mounting, and the terminal spring 13 or
The terminal plate 17 and the like are attached through the attachment port 10a.
Becomes After the terminal spring 13 and the terminal plate 17 are installed,
The mounting opening 10a is closed by the terminal cover 10.
Becomes

The terminal spring 13 is substantially H-shaped so as to form two locking pieces 14, a connecting portion 15, and two contact pieces 16.
It is made by bending a thin spring plate in the shape of a letter into a roughly L-shaped cross section. Locking piece 14 and contact piece 16 abut on terminal plate 17
I do. Reference numeral 18 denotes a film made of an elastic insulating resin, but may be thick. 19 is a terminal strip. The number of the conductor connection portions 5 may be selected as needed.

In the method of assembling the conductor connecting portion 5, a terminal spring 13 is mounted so as to fit within the square wall 7 of the base 3, and a terminal plate 17 is covered so as to be in contact with the upper surface of the inclined step 6. The terminal piece 19 is superimposed thereon and fixed with the fixing screw 12. Further, the film 18 is placed so as to be in contact with the upper surface of the square wall 7 and fixed by hooking the terminal cover 10 or the like.

The conductor 2 arranged behind the ceiling at the conductor connection part 5
When connecting 0, the core wire 21 of the conductor 20 is stripped and inserted into the insertion hole 23 of the conductor connection part 5. The insertion hole 23 must be covered with the film 18 on the surface and penetrate the core wire 21. The conductor used for the fire alarm system is generally a heat-resistant single wire, and its cut end is sharp.

Therefore, the film 18 may be made of ordinary silicone resin, but by using a material modified with an additive or the like in terms of resilience and strength, the core wire 21 can be more easily inserted so that no gap is formed. Can be.

In this configuration, since the vicinity of the insertion hole 23 of the film 18 is fixed by being sandwiched between the square wall 7 and the terminal cover 10, the core wire 21 easily penetrates the film 18, and no gap is formed. The tip of the core wire 21 inserted as described above first pushes the locking piece 14 of the terminal spring 13 to push the terminal plate 1.
Go back along 7

Further, the contact piece 16 is pushed to lock the locking piece 1.
4 and the contact piece 16. At this time, the covering 22 of the conductor 20 needs to be inside the film 18, and it is convenient that the contact piece 16 of the terminal spring 13 presses the core wire 21 and the locking piece 14 presses the covering 22. What
In addition, the conductor is held down at two places, the locking piece 14 and the contact piece 16.
As a result, the electrical connection between the terminal plate 17 and the conductor 20 is improved.
It can be kept in good condition.

As described above, the film 18 is provided so as to cover the insertion hole 23 so as to cover the metal fitting portion at the wire connecting portion 5 with which the conductive wire 20 is in contact, so that dust does not accumulate on the metal fitting portion. Water droplets traveling down the conductor 20 can also be prevented.

Reference numeral 24 denotes a metal fitting, and reference numeral 25 denotes a tooth washer made of resin or the like. The fixing bracket 24 is formed by punching a thin metal plate, and is formed with a flat portion 26 having both sides bent and having a U-shaped cross section, and a support portion 27 formed with an inverted J-shaped cross section at both ends thereof. .

The flat portion 26 is provided with a screw hole formed by burring or the like, and an attachment screw 28 attached to the fixing hole 4 of the base 3 is screwed therein. By tightening the mounting screw 28, the support portion 27 of the fixture 24 presses the ceiling plate 1, fixing the base 3 to the ceiling hole 2.

Reference numeral 29 denotes a sensor main body.
All are resin-molded similarly to the base 3, and are composed of a cover, a printed circuit board, a detection element, and the like. Reference numeral 30 denotes a terminal screw having a flange 31 formed on an upper portion thereof for conducting to a printed board (not shown), and a spring portion 32 protruding from the arc piece 8 provided on the base 3 and the terminal piece 19 of the conductor connecting portion 5. And the sensor body 29 to the base 3
Is fixed. Here, the spring portion 3 protruding from the terminal piece 19
The hole through which No. 2 pierces is filled with putty or the like.

In the above embodiment, the film 1 is
8 is fixed by the terminal cover 10,
It is also possible to use an adhesive, or use an adhesive film on one side to cover the existing fittings and insertion holes. It is needless to say that the present embodiment can also be configured as a so-called direct-attached sensor which is not separated into the sensor body and the base.

Since the present invention is configured as described above, the following remarkable effects can be obtained. (1) The conductor connection part is used to attach the terminal plate or terminal spring
As it is covered with a terminal cover with a lead wire insertion hole, water drops on the ceiling and other places do not fall on the metal fittings, dust does not accumulate on the metal fittings, and short-circuiting between the terminals and corrosion of the metal fittings are prevented. A reliable fire detector that does not occur can be obtained.
Further, since the conductor can be mounted simply by inserting the conductor through the insertion hole, the connection is simple. (2) Since the terminal cover is provided with an unlocking hole facing the locking piece, when the locking piece is pressed by inserting a pressing member such as a screwdriver into the unlocking hole at the time of unlocking, the spring pressing the conductive wire is pressed. Since the force is small, it can be easily extracted. (3) The conductor is connected to the contact piece and the locking piece of the terminal spring.
Good electrical connection between the conductor and the terminal board.
It can be securely held in the state.

[Brief description of the drawings]

FIG. 1 is a rear view showing a base using one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conductor connecting portion in FIG. 1;

FIG. 3 is a diagram in which conductive wires are connected to FIG. 2;

FIG. 4 is a front view of FIG. 1;

FIG. 5 is an installation diagram in which the embodiment of FIG. 1 is installed on a ceiling.

FIG. 6 is an assembly view of a conductor connecting portion.

[Explanation of symbols]

 3 Base 5 Conductor connection part 13 Terminal spring 17 Terminal plate 18 Film 20 Conductor 23 Insertion hole 29 Sensor body

Claims (3)

(57) [Scope of request for utility model registration] 1. A surface of a fire detector main body or a detector base .
In a fire detector provided with a lead wire connecting part provided above, the lead wire connecting part comprises a terminal plate, and a lead wire abutting on the terminal plate.
A terminal spring having a locking piece and a contact piece for holding the
Both have the terminal plate and a terminal spring mounting opening.
Further, the conductor connection portion is covered with a resin terminal cover having a conductor insertion hole so as to cover the mounting opening . 2. The fire detector according to claim 1, wherein an unlocking hole facing the locking piece is provided in the terminal cover. 3. The fire detector according to claim 2, wherein a pressing member of a locking piece is inserted into the unlocking hole.