JP3124816B2 - Sensor base - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor base structure of a sensor having a connection portion which can connect electric wires in a quick connection type.

[0002]

2. Description of the Related Art In an automatic fire alarm system, a plurality of sensors are connected in parallel to a two-wire sensor line of a receiver. Here, each sensor consists of a sensor base attached to a construction surface such as a ceiling, and a sensor head detachably attached to the sensor base, and the sensor head is attached to a mounting portion of the sensor base. When the sensor head is rotated, the pair of hook springs provided on the sensor head elastically engage with the pair of hook terminals provided on the mounting surface of the sensor base, respectively, so that the sensor head is mechanically and electrically. The structure is connected to the sensor base.

[0003] By the way, the connection of the sensor line in this type of conventional sensor has been made using a connection portion of a screw tightening structure provided on the sensor base. The sensor line connected to the connection section is connected to the hooking terminal by an appropriate method. However, when the electric wires are connected by such a screw tightening method, there is a problem that the connection state of the electric wires varies depending on the skill of an operator or the like.

[0004] Therefore, it has been considered that the connection portion has a quick connection terminal structure so that the electric wire can be connected to the sensor base by a so-called quick connection method. In other words, at this connection portion, a terminal plate and a locking spring that elastically presses the core wire of the electric wire to the terminal plate are provided inside, and only the core wire of the stripped electric wire is inserted from the wire insertion hole, It allows connection of electric wires.

[0005]

By the way, in this type of fire alarm equipment, it is required to remove the connection once in order to check the feed wiring in the inspection of the fire department. Therefore, in the case of a sensor of the type that is mounted while being exposed to the ceiling surface as described above, it is preferable that the connection be removed without removing the sensor base. Therefore, the connection portion is provided on a surface facing the sensor head of the sensor base.

In the case where the connection portion having the quick connection terminal structure is provided on the surface facing the sensor head of the sensor base, if the connection portion is provided at the center portion of the surface facing the sensor head, the connection of the electric wires is performed. There is a problem that it becomes difficult. In other words, in order to prevent the wires connected to this type of sensor base from being damaged by hitting the corners of the wire insertion part on the ceiling, at least the part that exposes the core wire and exposes the core wire is inside the sensor base. Need to be located. The opening for leading the electric wire to the surface facing the sensor head is formed at the center in relation to the position of the hook terminal. For this reason, when the connecting portion is provided at the center, the length of the electric wire introduced into the sensor base becomes short, and connection to the connecting portion becomes difficult.

Here, in the case of the conventional screw connection type connection portion, a method is adopted in which the core wire is lengthened and unnecessary portions are cut after connection to the connection portion, thereby facilitating the connection. Was like that. However, in the case of the connection part of the quick connection method, an extra part cannot be cut later, and therefore, the above-described method of lengthening the core wire cannot be adopted. That is, if the core wire is lengthened in the connection portion of the quick connection method, the core wire portion is exposed outside the connection portion, which is not preferable.

Therefore, it is conceivable to provide the connecting portion at a position far from the opening. However, in this case, the engagement position between the hook spring and the hook terminal is set so that the sensor head can be mounted as firmly as possible.
Since the position is close to the outer peripheral portion of the sensor base, the connecting portion is located on the rotation trajectory of the hook spring, and there is a problem that the connection of the sensor head is hindered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to make it easy to connect an electric wire to a connection portion and to perform sensing without affecting the mounting of a sensor head. To provide a container base.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, when the sensor head is rotated against the mounting portion, a pair of hook springs provided on the sensor head are mounted. Elastically engage with a pair of hooking terminals attached to the surface to mechanically and electrically connect the sensor head,
In the connection part of the quick-connecting terminal structure provided on the mounting surface, in a sensor base for connecting an electric wire introduced through an opening formed in the center part of the mounting surface, a hook terminal is provided on the mounting surface.
It is arranged along the radial direction and the hook
On the arc that includes the spring rotation trajectory and
In a portion opposite to the introduction side of the hook spring and in a nearby portion that does not hinder the elastic engagement state of the hook spring with the hook terminal ,
The connection part is arranged.

For example, as set forth in claim 2, a base portion of the connection portion is formed on a mounting surface, a cover portion is attached to the base portion to form a housing, and a cover inserted from a wire insertion hole is formed. The connecting portion can be formed so that the terminal plate and the locking spring, which elastically hold and hold the core wire of the stripped electric wire, are housed in the housing. In order to further facilitate the connection of the electric wires, the connecting portion may be arranged so that the electric wire insertion direction is inclined.

Further, in order to enable reliable connection of the electric wire, a locking spring for elastically pressing the core wire of the electric wire against the terminal plate is disposed in the longitudinal direction of the core wire. What is necessary is just to use the thing which elastically press-contacts a core wire to a terminal board at each of the both ends which are made, and one end part latches on a core wire. If you want to be able to remove the wire,
According to a fifth aspect of the present invention, on the surface of the connection portion facing the sensor head side, a release portion for simultaneously releasing the locking states of the locking springs respectively locked to the core wires of the different polarity electric wires may be formed. .

According to a sixth aspect of the present invention, when the sensor head detects a fire, the pair of hooking springs serving as output terminals is in a short-circuit state, and a voltage pole of a connection portion to which the sensor line is connected is provided. To simplify the wiring structure of the connection part and each part when the sensor base has an indicator light that lights up when the detector head detects a fire between the side and the hook terminal for the voltage pole. Preferably, the connection between the voltage pole side of the connection portion and the indicator lamp and the connection between the ground electrode side of the connection portion and the hooking terminal for the ground electrode are respectively performed using lead wires.

Further, according to the invention of claim 6, when the wiring of the connection part and each part is facilitated, a lead for connecting the voltage pole side of the connection part to the indicator lamp is provided as described in claim 7. The wires may be connected to the printed circuit board on which the indicator light is mounted, and the hooking terminals for the voltage electrodes may be connected to the indicator light via the printed circuit board. Further, in the invention according to claim 6, when the wiring state of the lead wire is improved and the connection between the connecting portion and the lead wire is facilitated, the lead wire is connected as described in claim 8. A groove to be buried may be formed in the mounting surface, and the lead wire may be connected by pressing the press-contact portion of the terminal plate of the connection portion to which the sensor line is connected.

[0015]

According to the present invention, by arranging the connection portion on the outer peripheral portion as described above, the length of the wire introduced into the sensor base is increased to increase the degree of freedom of the wire, and the connection to the connection portion is increased. A circle that facilitates the connection of electric wires and that includes the rotation locus of the hook spring
On the arc and opposite to the hook spring introduction side with respect to the hook terminal
By arranging the connecting portion on the opposite side and in a nearby portion that does not hinder the elastic engagement state of the hook spring with the hook terminal, a location that does not affect the rotation of the hook spring of the sensor head as much as possible. The connection is arranged so as not to affect the mounting of the sensor head.

[0016]

1 to 4 show an embodiment of the present invention. The sensor base of this embodiment is made of a synthetic resin, and is shown in FIG.
As shown in (1), the whole shape is formed in a substantially cylindrical shape, and a partition wall surface 11 that divides the inside into two upper and lower spaces is formed, and an electric wire wired in the ceiling is drawn into the center of the partition wall surface 11. Opening 12 is formed. The connection portions _{131-134 3} connecting wires are formed on the peripheral portion of the opening 12. Here, the connection portion 13 ₁ is connected to four electric wires, connecting portions 13 _2, 13 ₃ are those two wires are connected.

[0017] will be described below specifically the structure of these connecting portions _{131-134 3.} Incidentally, the connecting portions _{131-134 3}
Since its structure is substantially the same with only the number of wires to be connected are different, the following description explains distinguishes connecting portions _{131-134 3} only when particularly necessary, the other described connecting portion 13 without _{1-13 3,} collectively described as the connecting portion 13.

As shown in FIG. 2, the connecting portion 13 includes a base portion 13a formed on the partition wall surface 11 and a base portion 13a.
a, a cover portion 13b attached to the
a and a plurality of terminal plates 16 and a locking spring 17 housed in an internal space formed by the cover 13a and the cover 13b. A plurality of recesses 13c for accommodating the locking spring 17 are formed in the base portion 13a.
(B) As shown in FIG.
7 is stored diagonally upward. This recess 1
On the outer peripheral side of 3c, a groove 13f or an insertion hole 13f 'for mounting a terminal plate 16 described later is formed.

The cover portion 13b has a structure in which a portion corresponding to the concave portion 13c of the base portion 13a has a substantially triangular shape and one end side is horizontal. A plurality of wire insertion holes 13d are formed on one surface of the triangular portion. A release portion 13e is formed on the other surface to be pressed when the electric wire is removed. As shown in FIG. 3 (a), the release portion 13e is formed in a substantially T-shaped notch leaving only the base portion, and has a structure in which a tip portion is bent inward. As shown in FIG. 2B, a pressing portion 13g for pressing the locking spring 17 is formed. A groove 13h is formed in the release portion 13e in which the pressing portion 13g is formed so that a tool such as a driver pressing the portion does not slip.

As shown in FIG. 3 (b), the locking spring 17 has a base formed in a substantially C-shape, one end protruding obliquely inward to form a locking piece 17a, and the other end substantially U-shaped. The pressing piece 17b is formed in the shape of a letter. The locking piece 17a
3A, while being housed in the connecting portion 13, contacts the pressing portion 13g of the releasing portion 13e as shown in FIG. The terminal plate 16 is formed in a substantially rectangular shape at the center, and has a press-fitting portion 16a or a press-fitting portion 16a 'attached to the groove 13f or the insertion hole 13f' at one end, and the above-mentioned tip at the other end. A notch 16b for escape of the pressing portion 13g of the release portion 13e is formed. Here, the terminal plate 16 is
The locking spring 16 is housed in the concave portion 13c (the terminal plate 16 having the press-contact portion 16a formed therein together with the concave grooves 21 ₁ , 21).
In videos leads 20 ₁ to 20 ₂₎ state in the _2, attached to the base portion 13a of the contact portion 16a or the press-fitting portion 16a is inserted into the groove 13f or the insertion hole 13f '. Each lead wire 20 _1, 20 ₂ by cutting into the groove of the pressure contact portion 16a, is connected to the terminal plate 16 of each. In this state, the cover 13b is attached to the base 13a. The attached state of the cover 13b may be fixed by, for example, laser welding.

A method of connecting an electric wire to the connecting portion 13 having the above structure will be described. The connection of the electric wire is performed by inserting the core wire of the electric wire from which the sheath is peeled off and the core wire is stripped out into the electric wire insertion hole 13d. At this time, the core wire is elastically pressed against the terminal plate 16 by the locking piece 17a and the pressing piece 17b of the locking spring 17, and the electric connection between the electric wire and the terminal plate 16 is performed. Then, the locking piece 17a is locked to the core wire, thereby preventing the wire from coming off. In order to remove the electric wire from the connection portion 13, the release portion 13e may be pushed inward. At this time, the locked state of the locking piece 17a to the core wire is released by the pressing portion 13g, and the electric wire can be removed.

By the way, in the case of this type of conventional sensor, it is general that the connecting portion is not of a so-called quick-connecting terminal structure like the connecting portion 13 but of a screw tightening structure. With the tightening structure, the connection state varies depending on the skill of the operator, and there is a problem that it is difficult to obtain a uniform connection state. However, in the case of the connection portion 13 having the quick-connecting terminal structure as in this embodiment, the operator only has to insert the stripped electric wire into the electric wire insertion hole 13d, which is affected by the skill of the operator. Thus, a uniform connection state can be obtained.

[0023] The above individual description of the connecting portions _{131-134 3} in the following. Connecting portion 13 ₁ and the connection of the sensor lines,
It is used for sending this sensor line,
3 _2, 13 ₃ and for connecting the fire indicator lamp (not shown), is used as a feed line, connecting portions 13 ₂ leads 20 ₁
Is connected to the voltage pole side of the detector line.
₁ and the connecting portion 13 ₃ is connected to the operation display circuit 40 to be described later. A detailed description of the operation display circuit 40 will be described later.

FIG. 1 shows two locations on the inner periphery of the sensor base.
(A) As shown in FIG.
Hanging terminal 14₁, 14_TwoIs attached. This hook terminal
14 ₁, 14_TwoIs a flat base 1 as shown in FIG.
An L-shaped tongue piece 14b is formed from the inner end of the outer end 4a.
Connecting pieces 14c, 14c 'for making electrical connection to
It is formed. However, hook terminal 14₁Is the lead wire 20_Two
Is connected to the terminal strip 16 described above.
Formed in the same shape as the press contact portion 16a of the_Two
Of the operation display circuit 40 described later.
Connection structure by soldering to the printed circuit board 22.
I haven't. The connection unit 13 _ThreeTerminal board 16
Is also connected to the printed circuit board 22, so that the
4_TwoPress-fit portion 16a 'having the same structure as the connecting piece 14c'
It is.

The hooking terminals 14 ₁ and 14 ₂ correspond to those shown in FIG.
So that the base 14a extends along the radial direction of the partition wall surface 11 as shown in FIG.
It is arranged and fixed to the partition wall surface 11 by a fixing screw (or a stud) 30 through an insertion hole 14d formed in the base portion 14a and the tongue piece 14b. Since the base 14a is higher, the base 14a is fixed by using a boss 11a formed on the partition wall surface 11. In order to increase the fixing strength of the hooking terminals 14 ₁ and 14 ₂ and the horizontal holding strength of the base 14a, a holding rib 11b for pressing the side of the base 14a and a supporting rib 11c for supporting the base 14a from the lower surface side. Are formed on both sides of the boss 11a.

The attachment of the sensor head to the sensor base is performed by attaching the sensor head to the sensor base and rotating the sensor head clockwise. In this case, the sensor head is provided on the back surface of the sensor head. A hook spring piece (not shown) is elastically engaged with the hook terminal 16, and the sensor head is mechanically held on the sensor base. Here, both the hook terminal 16 and the hook spring piece have conductivity, and the contact between the hook terminal 16 and the hook spring piece also makes a mechanical and electrical connection between the sensor base and the sensor head. That is, a sensor head is connected between the sensor lines. However, the sensor head is connected between the sensor lines via an operation display circuit 40 described below.

The operation display circuit 40, as shown in FIG.
Formed by light emitting diode LD, resistor R and diode D
Lead wire 20₁To the voltage side of the sensor line
Hanging terminal 14_TwoBetween the sensor head and the sensor head
A fire is sensed and the detector head is
Is almost short-circuited, the light emitting diode
The LD lights up to indicate the fire detection status.
You. And the connection part 13 _ThreeIs hooked via diode D
Terminal 14_TwoConnected to Therefore, connect the indicator light
Part 13_Two, 13_ThreeWhen connected in between, fire at the sensor head
Is detected, the light emission of the light emitting diode LD is simultaneously performed.
In addition, the indicator light is also lit to indicate the fire detection status
be able to. In addition, the connection unit 13_Two, 13_ThreeUsing
Connecting part 13 of another sensor 1_Two, 13_ThreeTo send wiring
When a fire is detected by one of the detectors 1,
The fire indicator can be turned on.

The operation display circuit 40 is formed by mounting the above-described electronic components on a printed circuit board 22.
As shown in FIG. 1 (b), the printed circuit board 22 has a housing portion 1 formed by recessing the outer periphery of the sensor base from the rear side.
1d, and the back side of the storage portion 11d is closed with an insulating lid 23. Here, the outer peripheral portion of the sensor base corresponding to the mounting portion of the light emitting diode LD is bulged, and a display window 11f exposing the light emitting diode LD is formed on the upper surface of the bulged portion 11e.

By the way, this kind of sensor head is attached to the mounting part.
When rotated against the
A pair of hook ends with hook springs attached to the partition wall surface 11
Child 4 ₁, 14_TwoAnd the sensor head is mechanically
Electrically and electrically connected and disposed on the partition wall surface 11.
Connection part 13 of quick connection terminal structure₁In the center of this partition wall surface 11
Connection of electric wire introduced through opening 12 formed in the part
In the sensor base that performs₁Detector line to
The problem is that the connection of electric wires as
You.

[0030] Therefore, the outer peripheral portion of the partition wall surface 11 in the present embodiment, a an arc specifically including a rotation locus hooking spring of sensor head is rotated, pull against the hook pin 14 ₁
In the side opposite to the side where the hooked spring is introduced, and the hook pin 14
Neighboring parts that do not interfere with the elastic engagement state of the hook spring on ₁
It is arranged the connection portion 13 ₁ in position. Thus, by disposing the connection portion 13 ₁ in the outer peripheral portion, by increasing the length to be introduced into the detector in the base of the electric wire can be increased flexibility of the wire, connection wire to the connection portion 13 ₁ Becomes easier. Further, the connection portions 13 _1, if the hook of the sensor head
On a circular arc including a rotation locus where the spring rotates, and
14 _{1 On the} side opposite to the side where the hook spring is introduced,
By being arranged in the vicinity site and does not give trouble to the elastic engagement of the hooking spring to the hook pin 14 _1, the connecting portion 13 ₁ at a location that does not affect the rotation of the hooking spring utmost sensor head Can be arranged without affecting the mounting of the sensor head. Incidentally, although a detailed description is omitted, also placed in the same position as the connection portions 13 ₁ with respect to connecting portion 13 ₃
Thus, the connection of the electric wires is facilitated and the rotation of the hook spring is not affected. However, if comprising three connection portions _{131-134 3} as in this embodiment, one connection 1
Since respect 3 ₂ can not be placed in the position, as much as possible becomes the outer peripheral side, are arranged the connecting portions 13 ₂ and does not affect the rotation of the hooking spring position.

Further, connecting portions 13 ₁ and the connecting part 1 in this embodiment
3 ₂ and the operation display circuit 40 and the connection and the connection portion 13 ₁ and the connection between the hook pin 14 ₁ is performed by using the lead wires 20 _1, 20 ₂ for the following reason. In this type of conventional sensor base, and extends the printed circuit board 22 to the portion of the lead wires 20 _1, 20 _2, it had to perform wiring in the printed circuit board 22. However, the structure of the printed circuit board 22 is complicated in this case, the connection portions _{131-134 3} and or resulting width narrower portion from the relationship, such as opening 12, poor blank cutout, is costly problem is there. Therefore, in the present embodiment is performed by using the connecting portion 13 ₁ and the connecting portions 13 ₂ and the operation display circuit 40 and the connection and the connection portion 13 ₁ and the hooking pin 14 _first lead wire 20 ₁ a connection with, 20 ₂ .

By the way, in this embodiment, the connecting portion 13 ₁ is provided so that the connection can be removed without removing the sensor base.
To 13 ₃ Although is provided on a surface facing the sensor head of the partition wall surface 11, if it may in structure to disengage the connection by removing the sensor base may be employed the following sensor based structures. In the following description, the same members as those in the above embodiment are denoted by the same reference numerals (however, the suffixes are deleted), and the detailed description is omitted.

In the sensor base of FIGS. 5 and 6, a base portion 13a of the connection portion 13 is formed on the partition wall surface 11, and FIG.
As shown in (b), an electric wire insertion hole 13d is formed on the lower surface side of the base portion 13a. One of the terminal plates 16 is also used as the hook terminal 14. 7 and 8 is basically the same as the above-mentioned sensor base. In the case of this sensor base, an integrated structure is used as the locking spring 17 and The feature is that the base portion 13a is formed integrally. In addition, even with such a structure, it is possible to connect the electric wires in a quick connection type, and there is obtained an advantage that the connection work is easier than that of the screw type.

[0034]

According to the first aspect of the present invention, as described above, when the sensor head is rotated against the mounting portion, the pair of hook springs provided on the sensor head are mounted on the mounting surface. The sensor heads are mechanically and electrically connected to each other by elastically engaging with the hooking terminals, respectively, and are connected to the quick-connecting terminal structure provided on the mounting surface through an opening formed at the center of the mounting surface. In the sensor base for connecting the electric wire to be introduced, the hooking terminals are arranged along the radial direction of the mounting surface, and the outer peripheral portion of the mounting surface includes an arc including the rotation locus of the hook spring.
And the opposite side of the hooking terminal from the hook spring introduction side
And the connecting portion is arranged in a vicinity portion which does not hinder the elastic engagement state of the hooking spring with the hooking terminal. Since the connecting portion is arranged on the outer peripheral portion, the electric wire sensor is provided. the length to be introduced into the base can be longer, Accordingly increases flexibility of the wire is, Ru can easily <br/> connection wire to the connecting portion. In addition, on the arc including the rotation locus of the hook spring,
On the side opposite to the hook spring introduction side with respect to the hook terminal
Since the connecting portion is arranged in a vicinity portion which does not hinder the elastic engagement state of the hooking spring with the hooking terminal, the connecting portion is provided at a position which does not affect the rotation of the hooking spring of the sensor head as much as possible. It can be positioned and does not affect the mounting of the sensor head.

If the connecting portion is formed so that the wire insertion direction is oblique, the position of the wire insertion hole and the like can be easily confirmed, and therefore, the connection of the wire is further facilitated. Can be done. Also, as shown in claim 4,
As a locking spring for elastically pressing the core wire of the electric wire against the terminal plate, the core wire is elastically pressed against the terminal plate at both ends arranged in the longitudinal direction of the core wire, and one end is locked to the core wire. If a wire is used, the electric wire can be firmly held at the connection portion, and thus the electric wire can be securely connected.

Further, as described in claim 5, on the surface of the connection portion facing the sensor head side, the lock springs respectively locked to the core wires of the different-polarity electric wires are released simultaneously. When the portion is formed, the electric wire can be easily removed.
According to a sixth aspect of the present invention, when the sensor head detects a fire, the pair of hooking springs serving as output terminals is in a short-circuit state. In a sensor base including an indicator light that lights up when the sensor head detects a fire between the hook terminal for the pole and a connection between the voltage pole side of the connection part and the indicator light, If the connection between the side and the hooking terminal for the ground electrode is made using the respective lead wires, the structure of each member can be simplified.

Further, in the invention of claim 6, when the wiring of the connection portion and each portion is facilitated, the lead for connecting the voltage pole side of the connection portion to the indicator lamp is provided as described in claim 7. The wires may be connected to the printed circuit board on which the indicator light is mounted, and the hooking terminals for the voltage electrodes may be connected to the indicator light via the printed circuit board. Further, in the invention according to claim 6, when the wiring state of the lead wire is improved and the connection between the connecting portion and the lead wire is facilitated, the lead wire is connected as described in claim 8. A groove to be buried may be formed in the mounting surface, and the lead wire may be connected by pressing the press-contact portion of the terminal plate of the connection portion to which the sensor line is connected.

[Brief description of the drawings]

1 (a) to 1 (c) are a plan view, a side sectional view, and a front sectional view of a sensor base as one embodiment of the present invention.

FIG. 2 is an exploded perspective view of a sensor base.

FIGS. 3A to 3C are a partial plan view, a side sectional view, and a front sectional view of a connection portion of a sensor base.

FIG. 4 is an explanatory diagram of a sensor-based operation display circuit.

FIG. 5 is an exploded perspective view of a sensor base for connecting to a sensor line on a ceiling mounting surface side.

FIGS. 6 (a) and (b) are a plan view and a cross-sectional view of a main part after assembly in the above.

FIG. 7 is an exploded perspective view of another sensor base for connecting to the sensor line on the ceiling mounting surface side.

8 (a) and 8 (b) are a plan view and a cross-sectional view of a main part after assembly of the above.

[Explanation of symbols]

11 partition wall surface 12 opening _{131-134 3} connecting portion 13a base portion 13b covering portion 13d wire insertion hole 13e releasing portion 13g pressing portion 14 _1, 14 ₂ hooking pin 16 terminal plate 17 lock spring 20 _1, 20 ₂ lead 21 ₁ , 21 ₂ Groove 22 Printed circuit board 40 Operation display circuit

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A 2-145494 (JP, U) JP-A 1-155593 (JP, U) JP-A 56-77992 (JP, U) (58) Survey Field (Int. Cl. ⁷ , DB name) G08B 17/00

Claims (8)

(57) [Claims] When a sensor head is rotated against a mounting portion, a pair of hook springs provided on the sensor head are elastically engaged with a pair of hook terminals mounted on a mounting surface, respectively, so that the sensor head is rotated. A sensor base that mechanically and electrically connects to each other and connects electric wires introduced through an opening formed in a central portion of the mounting surface at a connection portion of the quick connection terminal structure provided on the mounting surface. The hooking terminal
Arranged I, of the outer peripheral portion of the mounting surface, the hook spring pivot
On the arc including the trajectory,
A sensor base comprising the connecting portion arranged at a portion opposite to the introduction side and in a vicinity portion which does not hinder the elastic engagement state of the hooking spring with the hooking terminal. 2. A base part of the connection part is formed on a mounting surface, a cover part is attached to the base part to form a housing, and a core of the electric wire, from which a coating inserted into the electric wire insertion hole is removed, is elastically held. 2. The sensor base according to claim 1, wherein the terminal plate and the locking spring are held in a housing. 3. The sensor base according to claim 1, wherein said connecting portions are arranged so that an electric wire insertion direction is oblique. 4. A locking spring for elastically pressing a core wire of an electric wire against the terminal plate, wherein the core wire is elastically pressed against the terminal plate at both ends arranged in the longitudinal direction of the core wire, and one end is provided. 3. The sensor base according to claim 2, wherein the sensor base is locked with a core wire. 5. A release portion for simultaneously releasing a locking state of a locking spring respectively locked to a core wire of an electric wire of a different polarity is formed on a surface of the connection portion facing the sensor head side. 3. The sensor base according to claim 2, wherein: 6. A detector head for short-circuiting between a pair of hook springs as output terminals when a fire is detected by a detector head,
A sensor base comprising an indicator light that is lit when a fire of a sensor head is detected between a voltage pole side of a connection part to which a sensor line is connected and a hook terminal for the voltage pole, wherein the voltage of the connection part is 2. The sensor according to claim 1, wherein the connection between the pole side and the indicator lamp and the connection between the grounding pole side and the hooking terminal for the grounding pole are made by using lead wires, respectively. base. 7. A lead wire for connecting the voltage pole side of the connection portion to the indicator light is connected to a printed circuit board on which the indicator light is mounted, and a hook terminal for the voltage electrode is connected to the indicator light via the printed circuit board. 7. The sensor base according to claim 6, wherein the base is connected. 8. A groove for burying the lead wire is formed on a mounting surface, and a pressure contact portion of a terminal plate of a connection portion to which a sensor line is connected is connected to each lead wire by pressure contact. 7. The sensor base according to claim 6, wherein: