JP3303962B2 - 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 attached to a ceiling or a wall of a building and connected to a plurality of lead wires drawn inside the ceiling or the wall.

[0002]

2. Description of the Related Art As a method of connecting an external lead wire drawn inside a ceiling or a wall to a fire detector, and a method of installing a fire detector, there are, for example, methods shown in FIGS. Here, the external lead wire is, for example, a sensor line extending from a receiver, a sensor line extending from a receiver via a repeater, or extending from a receiver via another fire sensor. The sensor line includes a signal line and a power line.

The system shown in FIG. 4 is a general system using a base 21 for mounting a fire detector. First, an installation hole 80a slightly smaller than the outer periphery of the base 21 is provided in a ceiling 80 at a position where the detector is installed. The base 2 is provided at the location of the installation hole 80a.
1 are fixed with screws, then the external lead wires 50, 50 extending from the receiver are pulled out and connected to the terminals 21b of the base 21 by screws, and then the terminals 22a of the main body 22 of the fire detector 20 are connected. Are connected to the terminals 21a of the base 21 to electrically connect the external lead wires 50, 50 to the fire detector 20 (or the main body 22).

The method shown in FIG. 5 is a method mainly used for a fire detector for waterproofing. Similar to the method shown in FIG. 4, the external lead wires 50, 50. Are connected to the lead wires 32 extending from the sensor 30 by soldering or the like, and then the fire detector 30 is fixed to the ceiling 80 with screws or the like.
In this method, for example, connection portions 40, 4 between the external leads 50, 50... And the leads 32, 32.
0, and wrapping the lead wires 32, 32,.
.. Are treated so that water does not enter between the covering portions of 0, 50.

[0005] In addition, a system disclosed in Japanese Utility Model Laid-Open No. 5-36594, which uses a base for mounting a sensor (base for a fire detector) on which a connector for connecting an external lead wire is formed, is also known. I have. These connectors have contacts in the fire detector base at the same height as the fire detector base, and the plurality of connectors are formed in a straight line.

[0006]

The connection between the external lead wire and the fire detector must be made while the worker is standing, but the screwing method shown in FIG. 4 and the soldering method shown in FIG. With the method described above, it is difficult to work while standing, and the work efficiency during construction is not good. In addition, the aforementioned Japanese Utility Model Laid-Open No. 5-36594
In the method using the fire detector base disclosed in Japanese Unexamined Patent Publication, the contact between the connector and the external lead wire is at the same height as the fire detector base in the fire detector base. There was a problem that it was difficult to prevent water from entering. For example, it cannot be easily sealed with waterproof tape.

[0007] In a normal wiring operation, connection is performed while confirming the polarity based on the color of the lead wire. However, since a plurality of connectors are formed in a straight line in the base for the fire detector, It is difficult to determine which line is connected to the connector, and there is a risk that the connector may be connected to an incorrect connector without connecting to a predetermined connector, and the reliability of wiring processing is low. Further, even when the polarity such as "+" or "-" is written in these connectors, it is difficult to confirm the polarity of the connector because the connector is provided on the ceiling surface of the fire detector.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has good fire detector mounting workability.
It is an object of the present invention to provide a fire detector in which the reliability of wiring processing with an external lead wire is high, and furthermore, the waterproofing of a contact with the external lead wire can be easily performed.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 is mounted on a ceiling or a wall of a building and connected to a plurality of external lead wires drawn inside the ceiling or the wall. A plurality of sensor leads extending from the fire sensor and electrically connected to the plurality of external leads, respectively attached to ends of the plurality of sensor leads, and By inserting a lead wire, the external lead wire and the sensor lead wire are electrically connected, and a connector for holding the external lead wire is provided.
Attached to the end of the sensor lead and
It has a case for accommodating the terminals of the sensor lead wires.
Insert the external lead wire into the
Insertion hole for connecting the lead wire and the sensor lead wire
Was and is configured.

According to the first aspect of the present invention, since the connection between the external lead wire and the sensor lead wire is performed via the connector, for example, when the fire detector is mounted on a ceiling or the like, the work is performed while standing. But the connection work can be done easily. In addition, connectors are individually attached to multiple sensor leads extending from the fire detector, so that which external lead is connected to which detector is indicated by color coding of the lead, etc. It is possible to do. By doing so, it is possible to prevent inconveniences such as erroneous connection locations, and to improve the reliability of wiring processing. Also, the contact point between the sensor lead and the external lead is located away from the fire detector by the extent that the sensor lead extends from the fire detector. Therefore, waterproof treatment can be easily performed by winding an insulating tape or the like around a contact portion (that is, a connector portion) between the sensor lead wire and the external lead wire. In other words, the workability of mounting the fire detector is good, the reliability of the wiring process is high, and the waterproof treatment of the contact portion with the external lead wire can be easily performed.

If the fire detector has a mounting base for mounting the fire detector, and the mounting base has a connection terminal with an external lead wire, the detector lead wire extending from the fire detector is provided. Is the lead wire extending from the mounting base, and if the fire detector is only the main body and has no mounting base, the detector lead wire extending from the above fire detector is It means the lead wire extending from the main body. As the above connector,
There are various known types, but any type may be used as long as the electrical connection of the lead wire is made by inserting the lead wire and the lead wire is held.

According to a second aspect of the present invention, in the fire detector according to the first aspect, an optional case is provided in a case portion of the connector.
Can be inserted and removed, and can be connected to the terminals of the sensor lead wires.
And an introduction hole.

According to the second aspect of the present invention, since the connector is provided with an introduction hole through which an arbitrary conductor can be inserted and removed and which leads to a terminal of the sensor lead wire, an arbitrary conductor is inserted into the introduction hole. This makes it possible to electrically connect the terminal of the sensor lead wire and the above-mentioned conductor, and when it is desired to release the connection, it can be released simply by pulling out the conductor from the introduction hole. That is, the introduction hole works well for making a temporary electrical connection to the terminals of the sensor leads. As an example of use of the introduction hole, for example, when conducting a good / defective test at the final stage of the manufacturing process of the fire sensor, a conductive pin is inserted into the introduction hole to electrically connect with the sensor lead wire. By connecting a test clip extending from the tester to this pin, the fire detector can be tested. If the pin is pulled out of the introduction hole after the test, the pin returns to its original state. Supplementally, the above-mentioned insertion hole for connecting the external lead wire is useful for connecting the external lead wire at the time of construction because it has a structure to hold the inserted lead wire, but the connection hole It is necessary to release the holding to disconnect, and it is not suitable for temporary connection. On the other hand, the above-mentioned introduction hole is convenient for temporary connection since an arbitrary conducting wire can be freely inserted and removed.

When the fire detector is installed on a ceiling or the like, it is preferable that the above-mentioned introduction hole is covered with an insulating tape or the like.

According to a third aspect of the present invention, in the fire detector according to the first or second aspect, the connector is arranged such that an end of the external lead wire is stripped from a front end thereof.
An external lead wire and the sensor lead wire were electrically connected by being inserted into the insertion hole , and a gauge indicating an appropriate amount for removing a coating for connecting the external lead wire was provided on the outer surface of the connector. The configuration was adopted.

According to the third aspect of the present invention, since the length of the outer lead wire whose coating is to be peeled off can be known using the gauge, the work can be performed while standing when installing the fire detector on the ceiling or the like. It is convenient.

Here, the gauge may be, for example, simply written or a groove formed in a groove shape. For example, if a groove is formed to fit (or slightly fit) the external lead wire into a gauge, it is easy and effective to remove the coating of the external lead wire when attaching a fire detector. In addition, the gauge may be of any type as long as it shows an appropriate amount for peeling off the coating of the external lead wire.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a side view showing an entire fire detector 1 according to an embodiment of the present invention.

The fire detector 1 of this embodiment is a thermal fire detector for detecting a fire by heat, and includes a heat-sensitive element 2c for detecting heat, a protector 2b for protecting the heat-sensitive element 2c, and Although not shown, a circuit portion provided inside the main body case 2a, a plurality of sensor leads 3, 3,... Connected to the circuit portion and extending outside, and connectors attached to the sensor leads 3, 3,. 4, 4,... The fire detector 1 is of a waterproof type, and the inside of the main body case 2a is sealed with a waterproof putty or a sealing member. For example, the thermal element 2c or the sensor leads 3, 3
.. Are exposed to the outside through through holes (not shown) provided in the main body case 2a, and these through holes are subjected to a sealing process. Further, the fire detector 1 does not have a mounting base for mounting the detector, and is of a type that can be directly mounted on a mounting portion (such as a ceiling or a wall of a building).

The sensor leads 3, 3,... Are signal lines for communicating with the receiver and power lines for supplying power to the fire detector. ). Each of these sensor leads 3, 3,... Is given a different color scheme, and which sensor lead 3, 3,. For example, depending on the color coding, the type of the signal line or the power line, the polarity of the power line ("+" or "-")
Are identified. And these sensor leads 3,
The connectors 4, 4... For wiring connection are separately attached to the ends of 3. The colors of the sensor leads 3, 3,... Are preferably the same as the colors of the external leads to be connected, so that connection mistakes can be almost eliminated.

FIG. 2 is a three-view drawing showing the appearance of the connectors 4, 4,... FIG. 1A is a side view of the same, and FIG.
Is a front view, and (c) is a top view. FIG. 3 shows a longitudinal sectional view of the connector. FIG. 3A is a longitudinal sectional view in a state where lead wires are not connected, and FIG. 3B is a longitudinal sectional view in a state where lead wires are connected.

As shown in FIGS. 2 and 3, the connector 4 is configured by housing a contact terminal 7 and a leaf spring 5 in a case portion 4a. The case portion 4a has a through hole 4e through which the sensor lead wire 3 passes, an insertion hole 4b into which an external lead wire 15 is inserted, and an introduction hole through which a test wire is inserted to temporarily connect to the sensor lead wire 3. In addition to the test line insertion hole 4c, a strip gauge 4d indicating the amount of the coating of the external lead 15 to be peeled off is provided on the outer surface, and the first chamber in which the contact with the external lead 15 is performed inside. 4 m and a second chamber 4 n that accommodates the crimping portion 7 a of the contact terminal 7 and makes contact with the test line are provided.

The strip gauge 4d is formed in a slightly recessed groove shape from the outer surface of the case portion 4a so that an external lead wire can be easily put along. Around the strip gauge 4d, the characters "strip gauge" indicating that the groove-shaped thing is a strip gauge and "φ0.8 to φ" indicating the allowable value of the diameter of the external lead wire to be connected.
The letters "1.3" and the letters "8 mm" indicating the length of the strip gauge 4d (that is, the appropriate amount of stripping the coating of the external lead wire to be connected) are each formed in a convex engraved display.

The contact terminal 7 is a conductor comprising a crimping portion 7a and a contact piece 7b. The contact terminal 7 is crimped to the sensor lead wire 3 by the crimping portion 7a, and the contact terminal 7 and the conductor of the sensor lead wire 3 are electrically connected. It is connected. The crimping part 7a is the second part of the case part 4a.
The sensor lead 3 is connected to the connector 4 while being locked in the chamber 4n. The contact piece 7b extends toward the first chamber 4m.

The leaf spring 5 is mounted in the first chamber 4m of the case portion 4a with one end of the leaf spring 5 pressed in the direction of pressing the contact piece 7. The leaf spring 5 is attached at an angle that is easy to pass in the direction in which the lead wire inserted from the insertion hole 4b is inserted, and is hard to pull out in the direction of discharging.

The fire detector 1 configured as described above is
For example, in order to attach to an installation location such as a ceiling, first, an installation hole that is slightly smaller than the outer periphery of the main body case 2a of the fire detector 1 is provided in the installation location, and external lead wires 15 extending from the receiver side are attached to the installation hole. Withdraw from Then, using a strip gauge 4d formed on the connector 4 of the fire detector 1, for example, measure an appropriate amount of the length for stripping the coating of the external leads 15, and strip the coating of the external leads 15 by that amount. .

Next, the external leads 15 are inserted into the insertion holes 4b of the predetermined connectors 4 so that the external leads 15 are inserted.
And the sensor leads 3 are connected. Here, the operator connects which external lead wire 15 to which detector lead wire 3.
Can be identified by color coding of the lead wires 3..., 15.

When the external lead wire 15 is inserted into the insertion hole 4 b of the connector 4, as shown in FIG. 3, the portion where the coating of the external lead wire 15 has been stripped is formed by the contact piece 7 b of the contact terminal 7 and the leaf spring 5. The external lead wire 15 and the contact piece 7b are electrically connected. Further, by the action of the pressing of the leaf spring 5 and the contact angle of the leaf spring 5, the external lead wire 15 is locked so as not to move in the pulling-out direction,
The external lead 15 is held by the connector 4.

When the external lead wires 15 are connected to the connectors 4, a waterproof insulating tape is wrapped around the connectors 4, and the through holes 4e, the test line insertion holes 4c, and the insertion holes of the connector 4 are inserted. Waterproofing is performed so that water does not enter the inside of the connector 4 from the portion 4b. After all of the connection between the external lead wires 15 and the connector 4 and the waterproofing process are completed, the main body case 2a of the fire detector 1 is fixed to the installation location by screwing or the like.
The installation of the fire detector 1 is completed.

In addition, for example, in the final stage of the manufacturing process of the fire detector 1, when conducting a good / bad test of the fire detector 1, a conductive pin is inserted and fixed in the test line insertion hole 4c. By connecting a test clip extending from the tester to this pin, the tester and the fire detector 1 can be electrically connected to perform a test. After the test is completed, the connection between the fire detector 1 and the tester is released only by pulling out the pin from the test line insertion hole 4c.

As described above, according to the fire detector 1 of this embodiment, the external leads 15 and the detector leads 3
Is connected via the connector 4, so that the connection operation can be easily performed even when the user is standing.

Further, since the connectors 4 are individually attached to the sensor leads 3, one by one, the color of the lead wire is used to determine which external lead 15 is connected to which sensor lead 3. For example, it is possible to display. By doing so, it is possible to prevent a problem such as a wrong connection location.

Further, since the contact points between the sensor lead wires 3 and the external lead wires 15 are separated from the fire detector 1 by the length of the sensor lead wires 3. A waterproof treatment can be easily performed by winding an insulating tape around a contact portion (that is, a portion of the connector 4) between the wires 3 and the external lead wires 15. This configuration and operation are particularly useful for a waterproof fire detector such as the fire detector 1.

Further, the electrical connection and disconnection with the sensor lead wires 3 can be easily performed by the test wire insertion hole 4c provided in the connector 4, so that the sensor lead wires 3.
This is convenient when a temporary electrical connection is made. Also,
The strip gauge 4d formed on the connector 4 can measure an appropriate length of the stripping of the outer lead wire 15, so that it is convenient for installation work while standing.

The present invention is not limited to the fire detector 1 according to this embodiment. For example, a waterproof type thermal detector has been described as an example of the type of the detector. The present invention can be applied to various fire detectors regardless of the type, such as a detector and an ionization type fire detector. In addition, when the present invention is applied to a fire detector equipped with a mounting base for mounting a sensor and having a connection terminal connected to an external lead wire on the mounting base, the mounting base is provided with a sensor lead wire and a connector. It should be attached. In addition, the detailed structure etc. specifically shown above,
Changes can be made as appropriate without departing from the spirit of the present invention.

[0036]

According to the first aspect of the present invention, since the connection between the external lead wire and the sensor lead wire is performed through the connector, for example, when the fire detector is mounted on a ceiling or the like, the fire detector is kept standing. Connection work can be easily performed. In addition, connectors are individually attached to fire detectors or multiple extended detector leads, so that which external lead is connected to which detector lead is indicated by color coding of the lead, etc. It is possible to do. By doing so, it is possible to prevent inconveniences such as erroneous connection locations, and to improve the reliability of wiring processing. Also,
Since the contact point between the sensor lead and the external lead is located at a position away from the fire detector because the detector lead extends from the fire detector, the contact portion between the sensor lead and the external lead ( That is, waterproof treatment can be easily performed by wrapping an insulating tape around the connector).

According to the second aspect of the present invention, the electrical connection and disconnection with the sensor lead wire can be easily performed by the introduction hole provided in the connector. This is convenient when a temporary electrical connection is made to the sensor leads, such as when a good / bad test is performed at a stage.

According to the third aspect of the present invention, the appropriate length of the stripping of the outer lead wire can be measured using the gauge formed on the connector, so that the fire detector is installed on the ceiling or the like while standing. Convenient in case.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire fire detector according to an embodiment of the present invention.

FIG. 2 is a three side view showing an appearance of the connector of FIG. 1,
(A) is a side view, (b) is a front view, (c) is a top view.

3A and 3B show the inside of the connector, in which FIG. 3A is a longitudinal sectional view in a state where a lead wire is not connected, and FIG. 3B is a longitudinal sectional view in a state where a lead wire is connected.

FIG. 4 is a side view showing a conventional example of a connection structure between an external lead wire extending from a receiver and a fire detector.

FIG. 5 is a side view showing another conventional example of the connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire detector 3 ... Detector lead wire 4 ... Connector 4a Connector case 4b Insertion hole 4c Test line insertion hole (introduction hole) 4d Strip gauge 5 Leaf spring 7 Contact terminal 15 External lead wire

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiyuki Ikeda 1 Minamihata, Konoike character, Itami City, Hyogo Nittan Seiki Co., Ltd. (72) Inventor Nobuo Nagata 1 Minamihata, Konoike character, Itami City, Hyogo Nittan Seiki Co., Ltd. (72) Inventor Tomoyuki Yamamoto 1-11-7 Hatagaya, Shibuya-ku, Tokyo Nittan Electronics Co., Ltd. (56) References JP-A-4-218272 (JP, A) JP-A-3-3088 (JP, U) Shokai Sho 57-18266 (JP, U) Shokai Hei 7-16292 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G08B 17/00 H01R 4/00-4 / 72

Claims (3)

(57) [Claims] 1. A fire detector attached to a ceiling or wall of a building and connected to a plurality of external leads drawn inside the ceiling or wall, wherein the plurality of external leads extend from the fire detector and are electrically connected to the plurality of external leads. A plurality of sensor leads to be connected to each other, and separately attached to ends of the plurality of sensor leads, and by inserting the external leads,
A connector for electrically connecting the external lead and the sensor lead and holding the external lead, wherein the connector is attached to an end of the sensor lead and
It has a case part for accommodating the terminals of the sensor lead wire, and the external lead wire is inserted into this case part to sense the external lead wire.
A fire detector characterized by having an insertion hole for connecting to a device lead wire . 2. A terminal of the sensor lead wire, wherein an arbitrary lead wire can be inserted into and removed from the case portion of the connector.
2. The fire detector according to claim 1, further comprising an introduction hole communicating with the fire detector. 3. The connector electrically connects an external lead and the sensor lead by inserting the end into the insertion hole in a state where an end of the external lead is stripped. The fire detector according to claim 1, wherein a gauge indicating an appropriate amount of stripping a coating for connecting an external lead wire is provided on an outer surface of the connector.