JP2589335Y2 - Terminal block - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal block for connecting wires, and more particularly to a terminal block having a structure capable of holding a tightening screw for connecting wires without looseness.

[0002]

2. Description of the Related Art A conductive plate is provided on an insulative substrate, and a screw hole for screwing a tightening screw for wire connection is formed in the conductive plate, and this is used as a wire connection portion. There have been proposed various types of terminal blocks that are electrically connected to each other.

[0003]

When the terminal block is shipped with the tightening screw loosely screwed into the screw hole, the tightening screw and the screw hole have a clearance, so that the terminal block rotates due to vibration during transportation or the like. It is easy to remove the screws. Therefore, in order to prevent this detachment, the screw is tightened to the end, and the washer fitted to the neck is pressed against the conductive plate to prevent the detachment, but the screwing amount is large,
The screwing operation takes time, and at the time of use, the tightening screw must be screwed back once and raised, the crimp terminal provided at the end of the electric wire must be inserted and screwed in again, which is a double labor and troublesome. Was. SUMMARY OF THE INVENTION An object of the present invention is to provide a terminal block having a configuration in which the tightening screw does not come off during shipping and transport of the terminal block even if the tightening screw is loosely screwed.

[0004]

According to the present invention , a void is formed at a position directly below a screw hole of the conductive plate, and from both inner side surfaces of the void.
A terminal block characterized in that a support projection is formed to oppose the lower end of a fastening screw screwed into the screw hole from both sides.

Alternatively, a toothless portion is formed below the tightening screw, and an empty space is formed at a position immediately below the screw hole of the conductive plate.
A terminal block, wherein a support projection is formed opposite to both inner side surfaces of the cavity so as to be engaged in a toothless portion of a tightening screw screwed into the screw hole.

Further, an elastic body such as a sponge for pressing the lower end of the tightening screw upward is attached to an insertion space at a position immediately below the screw hole of the conductive plate where the lower end of the tightening screw is inserted. It is a terminal block characterized by the above.

[0007]

In the above construction, the lower end portion of the tightening screw is sandwiched between the support protrusions of the terminal block, and is supported at two positions above and below the screw hole, thereby preventing the swing in the width direction. For this reason, the rotation of the screw at the time of conveyance is caused by the roll acting as a component force in the rotation direction. Vibration does not cause rotational movement of the tightening screw, so that disengagement can be prevented. Alternatively, when the support protrusion is engaged in the toothless portion formed below the tightening screw, even if the tightening screw is rotated by external vibration, the lower screw portion immediately below the toothless portion is
Abuts against the supporting lip, so that with weak force due to vibration,
Since the lower screw portion cannot exceed the support protrusion, the detachment of the tightening screw can be prevented.

Furthermore, when the tightening screw is urged upward by an elastic body, the screw thread of the tightening screw comes into contact with the screw hole, and even if there is a gap between the screws, the screw is in a pressed state.
The lower end is also supported by the elastic body. For this reason, rotation of the fastening screw is unlikely to occur, and detachment of the screw is prevented.

[0009]

1 shows an embodiment in which the fastening screw of the present invention is applied to a terminal block 1. FIG. Here, the terminal block 1 is formed in a plate shape from an insulating resin material such as polycarbonate, and on one surface of a back plate 2, a bottom plate 3, a pair of left and right support portions 4 a, 4 b, 4 a, extending upward from both sides of the bottom plate 3. 4b and a thick part 6 such as an upper partition wall 5 separating the left and right electric wire connection parts are integrally formed. And the support portions 4a, 4b, 4a, 4b
A conductive plate 8 is mounted on the upper end of the partition wall 5 in a lateral direction across the lower portion of the partition wall 5. Both sides of the conductive plate 8 on the left and right sides of the partition wall 5 are used as wire connection portions, respectively, and screw holes 9 are formed in the connection portions.

A tightening screw 10a is screwed into the screw holes 9,9. The tightening screw 10a of the tightening screw 10a
A washer 16 is externally fitted to the neck of the device, and a washer 17 is further fitted on the washer 16.

Next, the main part of the present invention will be described. A missing tooth insertion portion 13 is formed at the lower end of the tightening screw 10a. The height of the missing tooth insertion portion 13 is equal to or greater than the height of the screw hole 9. This dimension is set in order to prevent the tightening screw 10a from easily detaching from the screw hole 9 of the conductive plate 8 to the outside. The height of the screw hole 9 may be smaller than the screw height of the screw hole 9 as long as the screw hole 9 is not easily detached outward. The outer diameter of the missing tooth insertion portion 13 is equal to or slightly smaller than the tip diameter of the screw hole 9. This missing tooth insertion part 13
As shown in FIG. 2, the tightening screw 10a is
If the missing tooth insertion portion 13 is located in the screw hole 9 even if the screw is excessively rotated, it cannot be lifted and the fastening screw 10a can be prevented from coming off during the loosening operation.

A hollow portion 20 is formed below the screw hole 9 between the support portions 4a and 4b.
The support projections 2 are opposed to each other from the inner surfaces of the support portions 4a and 4b.
1,21 are formed. The distance between the tips of the support projections 21 and 21 is substantially equal to the outer diameter of the missing tooth insertion portion 13. As shown in the right part of FIG. 1, the height of the support projections 21 and 21 is a position where the fastening screw 10 a is loosely screwed. 2
It is set so as to be located between 1 and 2.

In such a configuration, fork-shaped crimp terminals 26 attached to the ends of the electric wires 25 are externally fitted to the tightening screws 10a at the electric wire connection portions on both sides of the upper partition 5, and tightened as shown in the left part of FIG. The washer 16 is crimped to the crimp terminal 26 in accordance with the tightening of the screw 10 a, and the crimp terminal 26 is fixed to the upper surface of the screw hole 9. This ensures that the crimp terminal 26 is electrically connected to the conductive plate 8, and the electric wires 25,
25 are electrically connected to each other.

In such a configuration, at the time of shipment, the tightening screw 10a may be loosely screwed into the screw hole 9 as shown in the right part of FIG. In this state, the lower end of the missing tooth insertion portion 13 of the tightening screw 10a is inserted between the support protrusions 21 and 21. As described above, the distance between the support protrusions 21 and 21 is set to the diameter of the missing tooth insertion portion 13. Since they are substantially equal, the missing tooth insertion portion 13 has its lower end portion sandwiched between the supporting projections 21 and 21. For this reason, the tightening screw 10a is supported by the screw hole 9 and the supporting protrusions 21 and 21 in two upper and lower positions, thereby preventing the horizontal swing.

In the conventional configuration, the loosening of the screw 10a due to external vibration during the conveyance is caused by the lateral sway acting as a component in the rotational direction. By preventing the shaking, even if the vibration is received at the time of transportation or the like, the vibration does not cause the rotational movement of the tightening screw 10a, and the separation can be prevented. In use, since the tightening screw 10a is previously loosened, the fork-shaped crimp terminal 26 can be inserted from the side without turning the tightening screw 10a to the state shown in FIG. The connection operation can be easily performed.

FIG. 3 shows a case in which a normal tightening screw 10b having no missing tooth insertion portion 13 is applied. In this case, if the interval between the supporting projections 21 and 21 is made substantially equal to the screw thread diameter. As described above, the lower end of the tightening screw 10a can be supported between the support projections 21 and 21, and rotation due to external vibration can be prevented.

FIG. 4 shows another means for preventing the fastening screw 10c from coming off. That is, the tightening screw 1
A toothless portion 30 is formed below 0c. Also,
Immediately below the screw hole 9, the supporting protrusions 21,
21 is provided. The interval between the support projections 21 and 21 is made smaller than the screw thread diameter of the fastening screw 10c, and when the fastening screw 10c is screwed, the support projection 21 and 21 are attached to the missing tooth portion 30.
The tip of 21 is engaged.

Further, the height of the toothless portion 30 is such that even if the tightening screw 10c is fully tightened,
The state in which the tips of the first and the second 21 are engaged with the toothless portion 30 is maintained,
In addition, even when the tightening screw 10c is loosened and screwed into the screw hole 9 at the time of shipment or the like, the tip of the support projection 21 or 21 is similarly set to be able to engage with the toothless portion 30. That is,
As shown in the right side of FIG. 4, the state is set so that A ′ ≒ A in the state of maximum loosening.

In such a configuration, first, the fastening screw 1
When the screw 0c is screwed into the screw hole 9 so as to be in the right state in FIG. 4, the lower screw portion 31 immediately below the toothless portion 30 of the tightening screw 10c is formed by utilizing the bending of the supporting projections 21, 21. , And pass between the support projections 21 and 21. After the passage, the tips of the support projections 21 and 21 engage with the toothless portion 30, and no resistance is received by the support projections 21 and 21, so that the screwing operation of the fastening screw 10c is smoothly performed. Becomes possible.

When the terminal block 1 is shipped, it can be set in a state where the supporting projections 21 and 21 are lightly screwed into the toothless portion 30 in the right state in FIG. In this state, the lower screw portion 31 is engaged with the supporting protrusions 21 and 21 and cannot be moved upward between them due to external vibration at the time of shipping, so that the fastening screw 10c does not come off. . In use, since the tightening screw 10c is maintained in a loosened state in advance, the tightening screw 10c is used.
Even if c is not rotated, the fork-shaped crimp terminal 26 can be inserted from the side and brought to the left state in FIG. 4, and the connection operation can be easily performed. It should be noted that even if the support projection 21 is formed only on one side, an action of preventing the fastening screw 10c from being detached by engagement with the lower screw portion 31 may be generated.

On the other hand, since the toothless portion 30 is formed in the tightening screw 10c, when the tightening screw 10c is forcibly rotated and loosened by an electric tool or the like, the lower screw portion 31 is supported by the supporting projection 2.
Even after passing between the screw holes 1 and 21, the rotation of the tightening screw 10c becomes impossible in a state where the toothless portion 30 has reached the screw hole 9, and the separation of the tightening screw 10c from the screw hole 9 can be prevented. In order to provide this effect, the height of the toothless portion 30 needs to be equal to or greater than the height of the screw hole 9.

FIG. 5 shows another means for preventing the fastening screw 10d from coming off. In such a configuration, an elastic body 40 such as sponge, rubber, or the like is provided in the space 20, and the lower end of the tightening screw 10d is constantly urged upward. For this reason, even if the tightening screw 10d is loosened as shown in the right part of FIG.
Even if the lower end of Od is urged upward by the elastic body 40 and there is a clearance between the screw hole 9 and the tightening screw 10d,
Pressure contact causes rotation resistance, and the lower end of the elastic body 4
Supported by 0. For this reason, even if there is an external vibration, the rotation of the fastening screw 10d is prevented, and the detachment preventing action is produced. In the drawing, the tightening screw 10d provided with the missing tooth insertion portion 13 is applied, but the shape of the screw, such as a normal screw as shown in FIG. 3 and a screw with the missing tooth portion as shown in FIG. It can be applied independently.

[0023]

As described above, according to the present invention, the terminal block 1 is provided even when the tightening screws 10a to 10d are loosened.
Is not detached from the screw hole 9 of the conductive plate 8 due to external vibration during shipping, transportation, etc., so that it is not necessary to tighten the tightening screws 10a to 10d at the time of shipping, and the mounting of the screws is simplified, and Are tightening screws 10a-
There is an excellent effect that the operation of unscrewing the 10d is simplified and the handling is easy.

[Brief description of the drawings]

FIG. 1 is a front view showing a terminal block 1 according to a first embodiment of the present invention.

FIG. 2 is a front view showing a part of the terminal block 1 according to the first embodiment.

FIG. 3 is a front view showing a part of a terminal block 1 of a modified example.

FIG. 4 is a front view showing the terminal block 1 according to the second embodiment of the present invention.

FIG. 5 is a front view showing the terminal block 1 according to the third embodiment of the present invention.

[Description of Signs] 1 Terminal block 1 8 Conductive plate 9 Screw hole 10a to 10d Tightening screw 13 Missing tooth insertion portion 20 Empty portion 21, 21 Support projection edge 30 Missing tooth portion 31 Lower screw portion 40 Elastic body

Claims (3)

(57) [Scope of request for utility model registration] A conductive plate is provided on an insulative substrate, and a screw hole for screwing a tightening screw for wire connection is formed in the conductive plate to form a wire connection portion. A terminal block that is electrically connected to the terminal board, a void is formed immediately below the screw hole of the conductive plate ,
A terminal block characterized by having a supporting lip for holding a lower end portion of a tightening screw screwed in the screw hole from both sides in opposition from both inner side surfaces . 2. A conductive plate is provided on an insulating substrate, and a screw hole for screwing a tightening screw for wire connection is formed in the conductive plate, and this is used as a wire connection portion. A terminal block that is electrically connected to the terminal board through a toothless portion at a lower portion of the tightening screw, and a void immediately below a screw hole of the conductive plate;
The opposite shape from the terminal block, characterized in that it has突成the support flange that engages into the toothless portion of the tightening screw which is screwed into該螺Ko hole. 3. A conductive plate is provided on an insulative substrate, and a screw hole for screwing a tightening screw for electric wire connection is formed in the conductive plate, and this is used as an electric wire connection portion. A sponge that presses the lower end of the tightening screw upward into a space into which the lower end of the tightening screw is inserted immediately below the screw hole of the conductive plate. A terminal block provided with an elastic body such as