JP3208507B2 - Self-locking terminal device for fire detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention relates to a self-locking terminal device of a fire detector used in connection or the like of the fire detector ie fire detector body or fire detector based conductive lines.

[0002]

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

When the electric wire is detached from the self-locking terminal device, a driver is inserted into the driver insertion hole of the terminal fitting, the locking spring portion of the terminal spring is pushed down, and the pressing force on the pinched electric wire is released. The wire is extracted with.

[0004]

The conventional example has the following problems. (1) In the conventional example, the insertion depth of the driver is determined by the intuition of the operator, and 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 come into contact with the terminal fitting and the terminal function is impaired.

(2) When an electric wire is inserted through a pair of locking spring portions, the terminal fittings are bent by the spring force of the locking spring portions via the electric wires, so that the contact pressures of the right and left electric wires with respect to the terminal fittings are different and the conduction reliability is improved. A problem arises in sex.

(3) The conventional self-locking terminal is constituted by a pair of adjacent spring plates which are connected and conductive at the bottom of the spring plate, that is, connected 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 because the bending of the spring plate by the thick electric wire extends to the bottom of the spring plate and causes the adjacent spring plate to bend in the same direction via the connecting portion.

Further, even when wires having the same diameter are used, they interfere with each other, so that if one of the wires is bent, the wire becomes equivalent to a large diameter, and the pressure contact force on the other wire may be weakened.

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

[0009]

SUMMARY OF THE INVENTION The present invention, by the driver to be inserted from the driver insertion hole of the terminal fitting, the end
When the tip of the locking spring portion of the child spring is pressed, the locking spring portion is pressed.
Is a self-locking terminal device for a fire detector in which
Therefore, the terminal spring is pressed within the movement locus of the driver.
That a driver stopper is provided on the pressure spring portion side ,
A terminal spring having a locking spring portion and a pressing spring portion;
It is separate from the terminal spring, and it is
Fire with terminal fittings provided facing the pressure spring part
A self-locking terminal device for a sensor, wherein the terminal fitting comprises:
Formed on the lower surface of the terminal fitting, perpendicular to the wire insertion direction,
And located closer to the tip of the terminal fitting than the pressing spring portion.
Having rigid reinforcing means constituted by a horizontally long convex portion
The terminal spring is provided at an end of the terminal fitting.
Press the wire inserted over the terminal against the terminal fitting.
It's a is, the is intended to achieve the object.

[0010]

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

When extracting the electric wire, a driver is inserted through the driver insertion hole and the tip of the locking spring is pushed down. Then, the driver comes into contact with the driver stopper and stops its progress, so that the locking spring portion is not excessively pushed and plastically deformed.

[0012]

An embodiment 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 9 a and 9 b are formed in both 4 and 5, respectively.

The metal fitting 4 comprises a blade receiving metal 6 and a terminal metal 7 integrally formed with a screw hole 9a interposed therebetween . A rigid reinforcing means, for example, a mountain-shaped ridge (bead) 8 is formed on the terminal fitting 7.
Is a vertically long projection 8a on the upper surface of the terminal fitting 7 or a horizontally long projection 8 on the lower surface of the terminal fitting 7 provided in the bending direction of the terminal fitting 7.
b. The vertical projection 8a has a groove 8c on the lower surface, and the groove 8c is formed so that the side of the horizontal projection 8b is deep and the end becomes gradually shallower to the edge of the terminal fitting 7.

In this embodiment, the vertically long protrusions 8a are provided on both sides of the driver insertion hole 30, and one horizontally long protrusion 8b is provided in a direction orthogonal to the insertion hole 30, but the number, shape and arrangement of the beads are set. Is appropriately selected as needed. For example, the grooves formed on the rear surfaces of the protrusions 8a and 8b as beads may not be provided.

The spring plate 5 is provided with a blade receiving spring 10 facing the blade receiving member 6 and a terminal spring 11 facing the terminal metal member 7, and between the blade receiving spring 10 and the terminal spring 11 to insert an electric wire.
A screw hole 9b is formed on the side of the terminal spring 11 when viewed from the side (see FIGS. 3 and 5) . This terminal spring 11 has a bottom 1
A pair of left and right locking spring portions 13 formed by bending one end of the second side into a J-shape; and a pair of left and right pressing spring portions 14 formed by bending the other end to the same side and forming an S-shape or a crank shape. ,
Consists of

The lock spring portion 13 is continuous with the bottom portion 12 via a bent base portion 15 and has a guide groove 1 at the tip of its head.
6 are formed, and the bent base portion 15 is provided with a rigid 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 thereof are appropriately selected as required. For example, as shown in FIG. 6, the locking spring portion 13 is formed as a rigid reinforcing means so that the front view becomes trapezoidal, or as shown in FIG. The music base 15 may be wider than other parts.
Also, as shown in FIGS. 8 and 9, both side edges of the bent base 15 are bent at right angles to form side walls 15a, and semicircular grooves 15b are formed on both sides of the bent base 15 as shown in FIG. May be. The rigidity reinforcing means 20 is connected to the bottom 12 of the terminal spring 11.
, But may be formed without reaching the bottom 12.

The driver stopper 60 regulates the insertion depth of the driver 61 inserted from the driver insertion hole 30, and is provided within the movement locus of the driver 61. The driver stopper 60 is provided in the driver insertion hole 3.
The height L of the protrusion is determined appropriately 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 lock spring portion 13 with a gap therebetween. However, it is not always necessary to arrange the stopper 60 in this manner. May be arranged.

As the driver stopper 60, a driver insertion hole 30a of the terminal fitting 7 is formed in correspondence with the shape of the driver 61 as shown in FIG. The driver 61 and the inner wall surface of the insertion hole 30 come into close contact with each other,
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, the screw 21 is inserted into the screw holes 9 a, 9 b, and the two 4, 5 are screwed to the base 1 of the fire detector.

Then, an electric wire 25 is connected between the terminal fitting 7 and the terminal spring 11 as shown in FIG.
When the lock spring portion 13 and the pressing spring portion 14
Is bent by the pressing force of the electric wire 25, and is displaced from the state shown by the solid line to the state shown by the chain line.
The lock spring portion 13 and the pressing spring portion 14 connect the electric wire 25 to a terminal fitting.
7 and the terminal fitting 7 also connects the electric wire 25 to the terminal bar.
And press it. That is, the horizontally long projection 8b of the terminal fitting 7 is inserted.
The left and right electric wires 25 are pressed against the terminal spring 11.

At this time, the locking spring portion 13 is
Is provided with the rigidity reinforcing means 20, the deformation force of one lock spring portion 13 is not transmitted to the other lock spring portion 13 via the bottom portion 12. Therefore, since the pair of lock spring portions 13 does not interfere with each other, the insertion of the electric wire 25 into one of the lock spring portions 13 affects the pressing force of the other lock spring portion 13 on the electric wire. I will not receive it.

Further, since the pressing force of the electric wire 25 acts on the terminal fitting 7, the terminal fitting 7 tends to bend by the force.
Since the rigidity is increased by the rigidity reinforcing means 8, there is no bending. Therefore, the contact pressure of the left and right electric wires 25 to the terminal fitting 7 becomes uniform, and the conduction reliability of the left and right electric wires 25 can be improved.

A 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.
c is deeper on the side of the horizontally long convex portion 8b. For this reason, the groove portion facing the locking spring portion 13 is deep, and there is room in the insertion space, so that the electric wire 25 can be easily inserted. Also, groove 8
In (c), the portion of the groove on the terminal side facing the pressing spring portion 14 is shallow. Therefore, the electric wire 2
5, the pressing force acts 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 end edge of the horizontally long convex portion 8b near the tip of the terminal fitting 7. Therefore, the contact force with the electric wire 25 is
The continuity is stabilized because it is concentrated at two places. In the above example, the groove 8c is an inclined groove, but it may be a parallel groove whose depth is not changed.

Next, a case where the electric wire 25 is detached 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 is inserted.
Arrow A while contacting the tip 13a of the lock spring portion 13 of FIG.
Press in 60 directions. Then, the lock spring portion 13 is deformed, and its tip 13a is also displaced.

When the driver 61 comes into direct contact with the driver stopper 60, it stops moving in the direction of arrow A60. At this time, the tip of the lock spring portion 13 is in the state of 13b as shown by the chain line, and the tip 13b is
Separated from Therefore, the holding 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 lock 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 with a driver 61.
The driver 61 is disposed so as to come into contact with the distal end 13a of the lock spring portion 13 when the driver 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 it can be displaced to a predetermined position with a smaller force than pressing the entire head 13H of the lock spring portion 13, and the head 13H may be damaged. There is no.

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 lock springs 13 are simultaneously pushed down, both springs 13 are bent simultaneously. It is also possible to make the driver 61 abut only the locking spring portion 13 and to bend only the spring portion 13.

In the above embodiment, the blade receiving member 6 and the terminal metal member 7 and the blade receiving spring 10 and the terminal spring 11 are integrally formed. However, the blade receiving member 6, the terminal metal member 7, and the blade receiving member 7 are integrally formed. The spring 10 and the terminal spring 11 may be separated. In this case, the driver is inserted into the driver insertion hole in the above embodiment in which at least one of them is connected with a conductor during the separation, but the driver is not necessarily used, and another appropriate pressing member may be used. Although the self-locking terminal is used as the base of the fire detector, it is needless to say that this terminal may be used for the main body of the fire detector.

[0032]

The present invention has been configured as described above.
It has the following remarkable effects. (1) Since the driver stopper is provided in the movement locus of the driver, even if the driver is inserted from the driver insertion hole and the locking spring is pressed, the spring is not overpressed.
Therefore, the locking spring portion is deformed within the elastic limit, so that it is possible to prevent the plastic deformation from occurring.

(2) Since the terminal fittings are provided with the rigidity reinforcing means, the terminal fittings can be prevented from being bent and uniform contact pressure can be maintained. Therefore, the conduction reliability of the left and right electric wires can be improved as compared with the conventional example.

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

[Brief description of the 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. 1;

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

FIG. 4 is a main part enlarged front view showing a use state.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

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

FIG. 7 is a front view of a lock spring portion showing another embodiment, and FIG.
FIG.

FIG. 8 is a front view of a lock spring portion showing another embodiment and is a view corresponding to FIG. 7;

FIG. 9 is a cross-sectional view of one of the bent bases indicated by line IX-IX in FIG.

FIG. 10 is a sectional view of a bent base showing another embodiment, and FIG.
FIG.

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

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

FIG. 13 is a longitudinal sectional view showing a use state.

FIG. 14 is a longitudinal sectional view showing another state of use.

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

[Explanation of symbols]

 DESCRIPTION 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 Lock spring part 14 Pressing spring part 15 Bend base part 20 Bead 30 Driver insertion hole 60 Driver stopper

Claims (6)

(57) [Claims] Inserted from the driver insertion hole 1. A terminal fitting
The tip of the locking spring part of the terminal spring
Fire detection when the lock spring part is bent when pressed
A self-locking terminal device of the device, wherein the movement locus of the driver
Inside the terminal spring and on the side of the pressing spring of the terminal spring.
Fire detector self locking terminal device, characterized in that path is provided. 2. The device according to claim 1, wherein the driver stopper is a projection provided outside the movement locus of the locking spring.
A self-locking terminal device for the fire detector as described. 3. The self-locking terminal device for a fire detector according to claim 2, wherein the projection is arranged in series with the locking spring via a gap. 4. A terminal fitting inserted through a driver insertion hole.
The tip of the locking spring part of the terminal spring
Fire detection when the lock spring part is bent when pressed
Self-locking terminal device for a driver, wherein a driver is inserted into the driver insertion hole.
A self-locking terminal device for a fire detector, comprising a river stopper . 5. A terminal having a locking spring portion and a pressing spring portion.
A spring and the terminal spring are separate bodies, and the terminal spring is locked;
The spring part and the terminal fitting provided opposite to the pressing spring part
A self-locking terminal device for a fire detector provided with the terminal,
The metal fitting is formed on the lower surface of the terminal metal fitting, and is inserted in a direction in which the wire is inserted.
, And closer to the tip of the terminal fitting than the pressing spring portion.
Stiffening means composed of horizontally long projections
And the terminal spring includes the terminal fitting.
The wire inserted beyond the end edge of the
A self-locking terminal device for a fire detector, characterized by being pressed . 6. A terminal having a locking spring portion and a pressing spring portion.
A spring and the terminal spring are separate bodies, and the terminal spring is locked;
The spring part and the terminal fitting provided opposite to the pressing spring part
A self-locking terminal device for a fire detector provided with the terminal,
Fixing means for fixing the bracket and terminal spring to the fire detector,
It is provided on one side of the lock spring portion,
The terminal fitting is formed on a lower surface of the terminal fitting, and
Rigidity composed of horizontally long protrusions perpendicular to the wire insertion direction
It has reinforcing means, and further, the horizontally long convex portion,
The left and right wires inserted are pressed against the terminal spring.
Fire detector self locking pin and wherein the that.