JPH06150169A - Self-locking terminal device for fire sensor - Google Patents

Abstract

PURPOSE:To prevent plastic deformation of locking spring parts and to prevent bending of a terminal metal fitting to prevent mutual interference between adjacent locking spring parts by providing a driver stopper in the locus of movement of a driver and providing rigidity reinforcing means in bend base parts of the terminal metal fitting and locking spring parts. CONSTITUTION:When an electric wire is inserted between a terminal metal fitting 7 and a locking spring part 13, the locking spring part 13 presses the electric wire to the terminal metal fitting 7 while deforming. At this time, the terminal metal fitting 7 tries to bend but is prevented from bending by a rigidity reinforcing means 8. The deforming force of one locking spring part 13 tends to be transferred to the other locking spring 13 via a bottom part 12, but the deforming force is prevented from being transmitted through a bottom part by a rigidity reinforcing means 20 provided in a bend base part 15. When the driver is inserted from a driver insertion hole 30 to push up the front end of the locking spring part 13 at the time of pulling out the electric wire, the locking spring part 13 is not excessively pushed neither plastically deformed because the driver comes into contact with the driver stopper and stops going.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector, that is, a self-locking terminal device of a fire detector used for connecting a main body of the fire detector or a line of a base of the fire detector.

[0002]

2. Description of the Related Art A conventional self-locking terminal is provided with a terminal fitting for conduction and a terminal spring for holding the lock. This terminal fitting is formed separately from the blade receiving fitting, and both fittings are individually fixed to the fire detector body or to the base with screws or the like. The terminal spring includes a pair of locking spring parts and a pressing spring part. In this self-locking terminal, the electric wire of the feed wiring is sandwiched between the terminal fitting and the locking spring portion.

When the electric wire is removed from the self-locking terminal device, a driver is inserted into the driver insertion hole of the terminal fitting, and the locking spring portion of the terminal spring is pushed down to release the pressing force on the clamped electric wire. Is pulling out the electric wire.

[0004]

The conventional example has the following problems. (1) In the conventional example, since the insertion depth of this driver is determined by the operator's intuition, it may be too deep. However, if it is too deep, the locking spring portion of the terminal spring is plastically deformed, so that the electric wire does not contact the terminal fitting and the terminal function is impaired.

(2) When the electric wire is inserted into the pair of locking spring portions, the terminal fitting is bent by the spring force of the locking spring portion through the electric wire, so that the contact pressures of the left and right electric wires against the terminal fitting are different and the reliability of conduction is improved. There is a problem with sex.

(3) The conventional self-locking terminal is composed of a pair of adjacent spring plates, which are connected and conducted at the bottom of the spring plate, that is, a series of spring plates. Therefore, when electric wires having different wire diameters are inserted into the pair of spring plates, the pressure contact force of the thin electric wire is weakened by the bending of the spring plate by the adjacent thick electric wire. This is because the interference of the adjacent spring plate is caused by the bending of the spring plate due to the thick electric wire reaching the bottom of the spring plate and bending the adjacent spring plate in the same direction via the connecting portion.

Further, even when electric wires having the same diameter are used, they interfere with each other. Therefore, if one electric wire is bent, the electric wire has a large diameter, and the pressure contact force to the other electric wire may be weakened.

In view of the above circumstances, the present invention has an object to prevent the locking spring portion from being plastically deformed. Another object is to prevent bending of the terminal fitting and prevent adjacent lock spring parts from interfering with each other.

[0009]

According to the present invention, in a fire detector in which a driver is inserted from a driver insertion hole of a terminal fitting to bend a locking spring portion of a terminal spring, a driver stopper is provided in a movement locus of the driver. In addition, the terminal metal fitting is provided with a rigidity reinforcing means, and further, the locking spring portion is provided in a pair at the bottom through a bent base portion provided with the rigidity reinforcing means. To do.

[0010]

When the electric wire is inserted between the terminal fitting and the locking spring portion, the locking spring portion deforms and presses the electric wire against the terminal fitting. At this time, although the terminal fitting tries to bend, the bending is prevented by the rigidity reinforcing means, and the deforming force of one locking spring part is transmitted to the other locking spring part via the bottom part. However, transmission of the deformation force is prevented by the rigidity reinforcing means provided on the bent base portion.

When the electric wire is pulled out, the driver is inserted through the driver insertion hole to push down the tip of the locking spring portion. Then, the driver comes into contact with the driver stopper and stops its progress, and therefore, the locking spring portion is not excessively pressed to be plastically deformed.

[0012]

Embodiments of the present invention will be described with reference to the accompanying drawings. The housing 2 of the base 1 of the fire detector is provided with a self-locking terminal 3 and a driver insertion hole 30. The terminal 3 is composed of a metal fitting 4 and a spring plate 5, and screw holes 9a and 9b are formed in both 4 and 5, respectively.

The metal fitting 4 is composed of a blade receiving metal fitting 6 and a terminal metal fitting 7 which are integrally formed. The terminal fitting 7 is provided with a rigidity reinforcing means, for example, a mountain-shaped raised portion (bead) 8, and the bead 8 is provided with a vertically long convex on the upper surface of the terminal fitting 7 provided in the bending direction of the terminal fitting 7. Part 8a
Alternatively, it is the horizontally long convex portion 8b on the lower surface. Further, the lower surface of the vertically long convex portion 8a is a groove 8c, and the groove 8c is formed such that the side of the horizontally long convex portion 8b is deep and the end thereof is gradually shallow to the end edge of the terminal fitting 7.

In this embodiment, the vertically elongated protrusions 8a are provided on both sides of the driver insertion hole 30 and one horizontally elongated protrusion 8b is provided in the direction orthogonal to the insertion hole 30, but the number, shape and arrangement of the beads are arranged. Is appropriately selected according to need. For example, the grooves formed on the back surfaces of the protrusions 8a and 8b as beads may be omitted.

The spring plate 5 is provided with a blade receiving spring 10 facing the blade receiving fitting 6 and a terminal spring 11 facing the terminal fitting 7. The terminal spring 11 includes a locking spring portion 13 formed by bending one side end of the bottom portion 12 into a J-shape, and a pressing spring portion 14 formed by bending the other side end to the same side to form an S-shape or a crank shape. Consists of.

The locking spring portion 13 is continuous with the bottom portion 12 through the bent base portion 15, and the guide groove 1 is provided at the tip of the head portion thereof.
6 is formed, and the bent base portion 15 is provided with rigidity reinforcing means, for example, a mountain-shaped raised portion (bead) 20.

In this embodiment, one mountain-shaped ridge is used as the rigidity-reinforcing means, but the number, shape, and arrangement of the mountain-shaped ridges can be selected as needed. For example, as the rigidity reinforcing means, as shown in FIG. 6, the locking spring portion 13 is formed so that the front view has a trapezoidal shape, or as shown in FIG. The curved base portion 15 may be wider than other portions.
Further, as shown in FIGS. 8 and 9, both side edges of the bent base portion 15 are bent at right angles to form side walls 15a, or as shown in FIG. 10, semicircular grooves 15b are formed on both sides of the bent base portion 15. You may. In addition, the rigidity reinforcing means 20 includes the bottom portion 12 of the terminal spring 11.
Although it may be formed so as to extend up to, it may be formed without reaching the bottom portion 12.

The driver stopper 60 regulates the insertion depth of the driver 61 inserted through the driver insertion hole 30, and is provided within the movement locus of the driver 61. This driver stopper 60 has a driver insertion hole 3
The protrusion L is provided to face 0, and the height L of the protrusion is appropriately determined in consideration of the elastic limit of the locking spring portion 13 of the terminal spring 11.

The stopper 60 is arranged in series with the locking spring portion 13 with a gap in between, but it is not always necessary to arrange in this way, and for example, it is arranged in parallel so as to be sandwiched by both locking spring portions 13. You may arrange in.

Further, as the driver stopper 60, instead of the protrusion, a driver insertion hole 30a of the terminal fitting 7 is formed corresponding to the shape of the driver 61 as shown in FIG. 12, and the driver 61 has a predetermined depth. Then, the driver 61 and the inner wall surface of the insertion hole 30 come into close contact with each other, and the driver 6
The progress of 1 may be stopped.

Next, the operation of this embodiment will be described. After housing the terminal spring 11 in the housing 2, the metal fitting 4 is placed on the upper surface of the spring plate 5, and the screw 21 is inserted into the screw holes 9a and 9b to screw the both 4 and 5 to the base 1 of the fire detector.

Then, when the electric wire 25 is inserted between the terminal fitting 7 and the terminal spring 11, as shown in FIG.
3 and the pressing spring portion 14 are bent by the pressing force of the electric wire 25, and are displaced from the state shown by the solid line to the state shown by the chain line.

At this time, the locking spring portion 13 has the bent base portion 15
Since the rigidity reinforcing means 20 is provided in the above, the deformation force of the one locking spring portion 13 is not transmitted to the other locking spring portion 13 via the bottom portion 12. Therefore, since the pair of locking spring portions 13 and 13 do not interfere with each other, the insertion of the electric wire 25 into the one locking spring portion 13 affects the pressure contact force of the other locking spring portion 13 to the electric wire. I will not receive it.

Further, since the pressing force of the electric wire 25 also acts on the terminal fitting 7, the terminal fitting 7 tries to bend due to the force,
Since the rigidity is strengthened by the rigidity reinforcing means 8, it does not bend. Therefore, the contact pressure of the left and right electric wires 25 on the terminal fitting 7 becomes uniform, and the conduction reliability of the left and right electric wires 25 can be improved.

Further, the groove 8 formed on the lower surface of the terminal fitting 7
c acts as a guide groove when the electric wire 25 is inserted, and this groove 8
c is deeper on the side of the horizontally long convex portion 8b. Therefore, the portion of the groove facing the locking spring portion 13 is deep and the insertion space has a margin, so that the electric wire 25 can be easily inserted. Also, the groove 8
In c, the groove portion on the terminal side facing the pressing spring portion 14 is shallow. Therefore, the electric wire 2 by the pressing spring portion 14
The pressing force to 5 works strongly, and the conduction reliability increases. Further, the inserted electric wire 25 and the terminal fitting 7 are in contact with each other at two points, that is, the top and the edge of the laterally long convex portion 8b near the tip of the terminal fitting 7. Therefore, the contact force with the electric wire 25 is 2
Since it concentrates in several places, conduction is stable. Although the groove 8c is an inclined groove in the above example, it may be a parallel groove whose depth is not changed.

Next, the case where the electric wire 25 is removed from the self-locking terminal 3 will be described. As shown in FIG. 13, the driver 61 is inserted into the driver insertion hole 30, and the terminal spring 11
While contacting the tip 13a of the locking spring portion 13 of the arrow A
Press in 60 directions. Then, the locking spring portion 13 is deformed and its tip 13a is also displaced.

When the driver 61 directly contacts the driver stopper 60, the driver 61 stops moving in the direction of arrow A60. At this time, since the tip of the locking spring portion 13 is in the state of 13b as shown by the chain line, the tip 13b is connected to the electric wire 25.
Away from. Therefore, the clamping force on the electric wire 25 is released, and the electric wire 25 is easily pulled out.

In this state, as shown in FIG. 14, the electric wire 25 is pulled out and the driver 61 is moved in the direction of arrow A61 to be taken out from the driver insertion hole 30. Then, the locking spring portion 13 returns to its original state and its tip 13
c contacts the terminal fitting 7.

The driver insertion hole 60 is provided in the driver 61.
The driver 61 is arranged so as to contact the tip 13a of the locking spring portion 13 when the is inserted. Therefore, when the driver 61 is inserted into the hole 30, the driver 61
Always presses the tip 13a of the spring portion 13, so that the head 13H of the locking spring portion 13 can be displaced to a predetermined position with a small force and the head 13H may be damaged as compared with the case of pressing the entire head 13H of the locking spring portion 13. There is no.

Further, as shown in FIG. 15, when the driver 61 is inserted into the driver insertion hole 30 and the tips 13a, 13a of the both locking spring portions 13 are pushed down at the same time, both spring portions 13 are bent at the same time. It is also possible to bring the driver 61 into contact with only the locking spring portion 13 and bend only the spring portion 13.

Further, in the above embodiment, the blade receiving metal 6 and the terminal metal 7 and the blade receiving spring 10 and the terminal spring 11 are integrally formed, respectively. However, the blade receiving metal 6, the terminal metal 7 and the blade receiving metal 7 are integrally formed. The spring 10 and the terminal spring 11 may be separated. In this case, although the driver is inserted into the driver insertion hole in the above-described embodiment in which at least one of them is connected with the conductor during the separation, the driver is not necessarily required to be used, and another appropriate pressing member may be used. Further, although the self-locking terminal is used for the base of the fire detector, it goes without saying that this terminal may be used for the body of the fire detector.

[0032]

Since the present invention is constructed as described above,
It has the following remarkable effects. (1) Since the driver stopper is provided within the movement trajectory of the driver, even if the driver is inserted from the driver insertion hole to press the locking spring portion, the spring portion will not be pushed too much.
Therefore, since the locking spring portion is deformed within the elastic limit, the plastic deformation can be prevented.

(2) Since the terminal metal fitting is provided with the rigidity reinforcing means, the terminal metal fitting can be prevented from bending and a uniform contact pressure can be maintained. Therefore, compared to the conventional example, it is possible to improve the conduction reliability of the left and right electric wires.

(3) Since the rigidity reinforcing means is provided at the bent base portion of the locking spring portion, the deformation force of one locking spring portion is not transmitted to the other locking spring portion via the bottom portion. . Therefore,
Since each locking spring part deforms independently without interfering with each other, the deformation of one locking spring part by the electric wire does not weaken the pressure contact force of the other locking spring part to the electric wire.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a metal fitting in the component diagram of FIG.

3 is a perspective view showing a spring plate in the component diagram of FIG. 1. FIG.

FIG. 4 is an enlarged front view of an essential part showing a usage state.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a front view of a locking spring portion showing another embodiment.

FIG. 7 is a front view of a locking spring portion showing another embodiment, and FIG.
It is a figure corresponding to.

FIG. 8 is a front view of a locking spring portion showing another embodiment, corresponding to FIG. 7.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a sectional view of a bent base portion according to another embodiment, and FIG.
It is a figure corresponding to.

FIG. 11 is a front view of the right half of the fire detector.

FIG. 12 is a vertical sectional view showing another practical example of a driver stopper.

FIG. 13 is a vertical sectional view showing a usage state.

FIG. 14 is a vertical cross-sectional view showing another usage state.

FIG. 15 is an enlarged plan view showing another usage state.

[Explanation of symbols]

 1 Fire detector base 3 Self-locking terminal 4 Metal fitting 5 Spring plate 7 Terminal metal fitting 8 Bead 11 Terminal spring 12 Bottom 13 Locking spring part 14 Pressing spring part 15 Bend base 20 Bead 30 Driver insertion hole 60 Driver stopper

Claims (9)

[Claims] 1. A fire detector in which a driver is inserted from a driver insertion hole of a terminal fitting to bend a locking spring portion of a terminal spring, wherein a driver stopper is provided within a movement locus of the driver. Self-locking terminal device of the container. 2. The self-locking terminal device for a fire detector according to claim 1, wherein the driver stopper is a protrusion provided outside the movement locus of the locking spring portion. 3. The self-locking terminal device for a fire detector according to claim 2, wherein the protrusion is arranged in series with the locking spring portion with a gap therebetween. 4. The self-locking terminal device for a fire detector according to claim 2, wherein the projection is arranged in parallel with the locking spring part with a gap therebetween. 5. The self-locking terminal device for a fire detector according to claim 1, wherein the driver stopper is formed in the driver insertion hole. 6. A fire sensor in which a locking spring portion of a terminal spring is bent by inserting a driver from a driver insertion hole of a terminal fitting, and a driver stopper is provided within a movement locus of the driver, and rigidity of the terminal fitting is reinforced. A self-locking terminal device for a fire detector, which is provided with means. 7. The self-locking terminal device for a fire detector according to claim 6, wherein the rigidity reinforcing means is a mountain-shaped raised portion. 8. A fire detector in which a driver is inserted from a driver insertion hole of a terminal fitting to bend a locking spring portion of a terminal spring, and a driver stopper is provided in a movement locus of the driver, and the terminal fitting is rigid. A self-locking terminal device for a fire detector, characterized in that a reinforcing means is provided, and further, a pair of the locking spring portions are provided at a bottom portion via a bent base portion provided with a rigidity reinforcing means. 9. The self-locking terminal device for a fire detector according to claim 8, wherein the rigidity reinforcing means is a mountain-shaped ridge.