KR20100003533A - Fuse and bolt assembly including the same - Google Patents

Abstract

PURPOSE: A fuse and a bolt assembly including the same are provided to reduce the number of assembly processes by connecting both ends of the fuse to a circuit through one bolt fastening process. CONSTITUTION: A fuse(50) includes a melting part(52), first and second contact units(54,56), and first and second connection units(58,60). The melting part is arranged in a head part(32) of a bolt(30). The melting part is melt with an overcurrent. The first and second contact units are arranged in a body(40) of a bolt. The first and second contact units are electrically contacted with a nut. The first and second contact units have a polygonal cross section. The first and second connection units are vertically extended from both ends of the melting part. The first and second connection units electrically connect the first and second contact units with the melting part.

Description

Fuse and Bolt assembly including the same}

The present invention relates to a fuse and a bolt assembly including the same, and more particularly, to a fuse and a bolt assembly including the same that is easy to assemble and improve productivity.

A fuse is a device for stably using electricity. In other words, a fuse is a device that automatically cuts off excess current beyond the specified value on the wire.

For example, if an overcurrent flows in a fuse, the fuse melts and is blown by heat generated by the current.

Fuses are mainly classified according to their allowable capacity and blown characteristics and can be classified into general blade type and large-capacity slow blow type according to the allowable capacity. In the case of the large capacity slow blow type, the capacity of 60A or more can be a problem due to heat generation even though small contact resistance is increased.

1 is a circuit diagram illustrating a fuse in accordance with the prior art. The fuse shown in FIG. 1 is fixed at both ends by bolts, and a part which is melted when an overcurrent flows in the middle is formed.

Hereinafter, a method of installing a fuse according to the prior art will be described with reference to FIG. 1.

The power distribution box 10 is provided with a metal terminal electrically connected to the external power and load. In addition, the metal terminal is electrically connected to the fixing portion 14.

Then, the fuse 12 is positioned in the fixing part 14, and the fixing part 14 and the fuse 12 are coupled with the bolt 13. At this time, the bolt coupling is a mechanical coupling, but the fuse 12 and the fixing portion 14 are electrically connected.

At this time, the nut 15 is fixed to one end of the bolt 13 to the opposite side of the fixing part 14 to fix the bolt 13. This nut 15 is generally metal welded to the opposite side of the fixing part 14 or the like.

The above-described fuse according to the prior art should connect both ends of the fuse to the circuit with two bolts and two nuts, respectively. Therefore, two bolts are required to connect the fuses, and two bolts are required to check the torque at each bolt connection.

In addition, a large assembly area is required in order to couple fuses in which fuses are assembled horizontally in a box.

The present invention is to solve the above problems, and to provide a fuse and a bolt assembly including the same, which is easy to assemble, does not require a large assembly space during assembly.

In order to achieve the above object, the present invention is equipped with a head portion of the bolt is blown when the overcurrent flows; A plurality of contacts mounted on the body of the bolt to be in electrical contact with the nut; And a connection part electrically connecting the melted part and the contact part.

The melt end may be mounted across the center of the head of the bolt.

On the other hand, the connecting portion may extend vertically from the end of the melt portion, and may include a first connecting portion and a second connecting portion different in length from each other.

In this case, the contact portion is installed at one end of the connection portion, it is possible to protrude toward the body portion of the bolt.

In particular, the contact portion may have a cross-section in the shape of a polygon.

The present invention includes a head portion having a groove formed in the center, a threaded body portion, and a bolt made of a non-conductive material; And a fuse mounted on the head, the melt part being melted when an overcurrent flows, a plurality of contact parts mounted on the body part to be in electrical contact with a nut, and a connection part electrically connecting the melt part and the contact part. To provide a bolt assembly.

In addition, the connecting portion of the bolt assembly may extend vertically from the end of the melt end, it may include a first connecting portion and a second connecting portion different in length from each other.

In addition, the contact portion may have a cross-section in the shape of a polygon.

According to the present invention, the fuse can be assembled by one bolt coupling, and both ends of the fuse are not exposed to the outside after assembly so that they are resistant to contamination and are more safe from other possible electric shocks, and the aesthetics are improved.

In addition, the fuse can be assembled with a single bolted combination, which saves 50 percent of assembly effort since only one torque check is required.

And, when assembling the fuse, the bolt is reduced by one than the conventional fuse assembly, the fuse is changed to the contact by the screw thread can increase the contact area.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

2 is an exploded perspective view of a fuse and a bolt according to the present invention. A description with reference to FIG. 2 is as follows.

The bolt assembly according to the invention comprises a bolt 30 and a fuse 50.

The bolt 30 includes a head 32 having a groove 34 formed therein and a body 40 formed with a thread. That is, when the worker rotates the head 32, the body 40 is coupled to the nut while rotating.

The head part 32 may have a groove 34 formed in a straight direction. Whether the melted portion 52 of the fuse 50 is seated in the groove 34, and whether the melted portion 52 is deformed or the overcurrent flows and the melted portion 52 of the fuse 50 is cut. It is easy to see.

On the other hand, the color of the bolt assembly may be different depending on the electrical capacity of the bolt assembly. In particular, it is desirable to change the color of the head 32 of the bolt 30 that the user can easily see.

The body portion 40 is also provided with a seating groove 36 through which the contact portions 54 and 56 of the fuse 50 may be seated. The seating groove 36 is recessed toward the center of the body portion 40.

Two seating grooves 36 are installed in the body portion 40, and the contact portions 54 and 56 of the fuse 50 may be seated in the respective seating grooves 36.

In particular, the plurality of seating grooves 36 are preferably installed to face each other toward the center of the body portion 40. In other words, the seating groove 36 may be disposed to form an angle of 180 degrees.

On the other hand, the body portion 40 may also be composed of two parts, the radius of which is different as shown in FIG. On the other hand, the radius of the body portion 40 may be one having the same value.

The bolt 30 is preferably made of an insulator that does not transmit electricity. For example, the bolt 30 is preferably made of a plastic material.

The bolt assembly includes a fuse 50 that can be blown by a part of the heat generated by the current when the overcurrent flows.

On the other hand, the fuse 50 is mounted on the head 32 of the bolt and blown out when an overcurrent flows, and is mounted on the body portion 40 of the bolt 30 to be in electrical contact with the nut. Contacts 54, 56.

The contacts 54, 56 preferably have a cross section in the shape of a polygon. In particular, it is preferable that the cross section on the opposite side to which the contact portions 54 and 56 are inserted into the seating groove 36 of the body portion 40 has a polygonal shape. This will be described later with reference to FIG. 6.

The contact parts 54 and 56 include a first contact part 54 and a second contact part 56 capable of receiving and transmitting power. On the other hand, the first contact portion 54 and the second contact portion 56 is inserted into the seating groove 36, respectively.

On the other hand, the contact portion 54, 56 is preferably protruded by a predetermined thickness toward the center of the body portion 40, in order to increase the coupling force with the body portion 40. This is because a part of the contact portion 54, 56 is inserted into the seating groove 36 of the body portion 40 to be coupled.

In addition, the fuse 50 includes connecting portions 58 and 60 for electrically connecting the blown portion 52 and the contact portions 54 and 56.

The connecting portions 58 and 60 extend perpendicularly from the ends of the melted portion 52. The connecting portions 58 and 60 are connected to the first contact portion 54 and the second contact portion 56, respectively. This is to transfer a current input from one of the first contact portion 54 or the second contact portion 56 to the other of the first contact portion 54 or the second contact portion 56.

On the other hand, since the connecting portion 58, 60 extends from both ends of the melted portion 52, it is preferable to include a first connecting portion 58 and the second connecting portion (60).

In addition, the first connecting portion 58 and the second connecting portion 60 preferably vary in length from each other. In FIG. 2, the length of the first connector 58 is shorter than the length of the second connector 60, but the length of the second connector 60 is shorter than the length of the first connector 58. It is also possible to be configured.

If the lengths of the first connection portion 58 and the second connection portion 60 are the same, the positions of the nuts electrically contacting the first contact portion 54 and the second contact portion 56 are the same. Thus, the positions at which the first contact portion 54 and the second contact portion 56 make contact are the same. In this case, a circuit may not be configured because current may flow in or out at the same time through the first contact portion 54 and the second contact portion 56.

Figure 3 is a perspective view of the fuse and the bolt is coupled according to the invention, Figure 4 is a cross-sectional view of FIG. A description with reference to FIGS. 3 and 4 is as follows.

The shape of the bolt assembly to which the fuse 50 and the bolt 30 are coupled is similar to that of the conventional bolt 30.

The blown portion 52 of the fuse 50 is located at the head 32 of the bolt 30. It is preferable that the melted portion 52 is sufficiently inserted into the head portion 32. That is, it is preferable that the melted portion 52 has a height similar to that of the head portion 32. This is because if the melted portion 52 protrudes a lot to the top of the head 32, it requires a lot of space when installing the bolt assembly, the space utilization is inferior.

However, the first contact portion 54 and the second contact portion 56 of the fuse 50 may not be completely recessed in the seating groove 36. In other words, the first contact portion 54 and the second contact portion 56 preferably protrude from the body portion 40 by a predetermined thickness range.

This is because the first contact portion 54 and the second contact portion 56 are coupled to the nut to electrically contact the nut with a sufficient area.

5 is a circuit diagram illustrating a fuse and a bolt. A description with reference to FIG. 5 is as follows.

The bolt assembly is coupled to the plurality of nuts 70, 72. Since a thread is formed in the body portion 40 of the bolt 30, the bolt 30 is coupled to the nuts 70 and 72 as the thread is rotated.

Meanwhile, the nuts 70 and 72 may include a first nut 70 in electrical contact with the first contact portion 54 and a second nut 72 in electrical contact with the second contact portion 56. Can be.

In addition, the nuts 70 and 72 may be installed on fixing members 74 and 76 capable of fixing the nuts 70 and 72 while electrically contacting the nuts 70 and 72, respectively. Do. For example, the fixing members 74 and 76 may include metal bars made of conductors.

One of the fixing members 74 and 76 is connected to a load, and the other is connected to a power source.

6 is a cross-sectional view of a portion in which the nut is coupled to in FIG. A description with reference to FIG. 6 is as follows.

6 illustrates a main portion of a cross section of a portion where the first contact portion 54 and the first nut 70 are coupled to each other.

The cross section of the first contact portion 54 preferably has a polygonal shape at a portion where the first contact portion 54 is coupled to the first nut 70. This is to increase the area where the first contact portion 54 and the first nut 70 can be electrically contacted.

In addition, the first contact portion 54 and the first nut 70 may have a plurality of electrical contacts in space as well as the cross section of FIG. 6. This is because the first contact portion 54 and the first nut 70 exist by a predetermined depth along the depth direction of the body portion 40 of the bolt 30.

As can be seen in Figure 1, the fuse according to the prior art is generally in surface contact when the fuse is in electrical contact with the bolt or nut. In general, surface contact can be regarded as three-point contact when viewed as electrical contact.

Thus, the fuse according to the prior art is in electrical contact with only three points to transfer the electric.

On the other hand, the fuse according to the present invention can be in electrical contact in each space along the thread. Electrical contact can be made in more ways than in the prior art.

On the other hand, the second connecting portion 60 should be mounted to the body portion 40 in a form that does not electrically contact with the first nut (70). This is to implement the basic function of melting the blown part 52 when the fuse 50 is overcurrent as described above.

Since the bolt 30 is made of a material that does not conduct electricity, current may be transferred from the power supply to the load through the fuse 50.

Referring to the operation state of the fuse and the bolt assembly including the same as described above are as follows.

Current is transmitted from the power source to the fixing member 76. In addition, since the fixing member 76 and the second nut 72, the second nut 72 and the second contact portion 56 are in electrical contact with each other, a current is applied to the second contact portion 56. To reach.

The second contact portion 56 is connected to the second connection portion 60, and the second connection portion 60 is connected to the melt portion 52, and a current is transmitted to the melt portion 52. .

In addition, the melted portion 52 is connected to the first connector 58, the first connector 58 is connected to the first contact portion 54, the current is transmitted to the first contact portion 54 do.

The first contact portion 54 is in electrical contact with the first nut 70, and the first nut is in electrical contact with the fixing member 74. Thus, the current of the power supply can finally be delivered to the load.

On the other hand, when the electric current of the allowable value or more flows into the fuse 50, the blown part 52 is cut.

Then, the user can check only whether the blown part 52 is cut, and can easily know information on whether overcurrent flows into the fuse 50 or whether the fuse 50 is properly operated.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

1 is a circuit diagram of a fuse installed in accordance with the prior art.

Figure 2 is an exploded perspective view of the fuse and the bolt according to the present invention.

Figure 3 is a perspective view of the fuse and the bolt coupled to the present invention.

4 is a cross-sectional view of FIG.

5 is a circuit diagram of a fuse and a bolt installed.

FIG. 6 is a cross-sectional view of the portion of the nut in FIG.

<Description of Signs for Main Parts of Drawings>

30: bolt 32: head

36: seating groove 40: body portion

50: fuse 52: blown end

54: first contact portion 56: second contact portion

58: first connector 60: second connector

70: first nut 72: second nut

74, 76: fixing member

Claims (8)

A melting part mounted on the head of the bolt to melt when an overcurrent flows; A plurality of contacts mounted on the body of the bolt to be in electrical contact with the nut; And And a connecting portion electrically connecting the melted portion and the contact portion. The method of claim 1, And the blow-out portion is mounted across the center of the head of the bolt. The method of claim 1, The connector includes a first connector and a second connector extending vertically from the end of the melt portion and different in length from each other. The method of claim 1, The contact portion is installed on one end of the connecting portion, the fuse characterized in that the projecting toward the body portion of the bolt. The method of claim 1, The contact portion is a fuse, characterized in that the cross section is made of a polygonal shape. A head having a groove formed at the center and a body formed with a screw thread, the bolt made of a non-conductive material; And A fuse mounted on the head and melted when the overcurrent flows, a fuse mounted on the body, a plurality of contacts electrically contacting a nut, and a connection part electrically connecting the melt and the contact; Bolt assembly. The method of claim 6, And the connection part includes a first connection part and a second connection part which extend vertically from an end of the melt end and vary in length from each other. The method of claim 6, And the contact portion has a cross-section in the shape of a polygon.

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