JPH08315936A - Fuse clip - Google Patents

Abstract

PURPOSE: To easily insert a fuse on the operation of an automatic machine and mount the fuse on a high density packaging board by forming a recessed contact plane on a contactor piece at both sides of a fuse clip, and keeping a center contactor piece in contact with a fuse electrode. CONSTITUTION: A glass tube fuse 2 is retained with the holding section of a pair of fuse clips 10, and legs 15 and 16 formed as integral part of the clips 10 are inserted in the holes 4a of a printed circuit board 4. Then, the legs 15 and 16 are connected and fixed to a circuit pattern. The holding section is formed out of three approximately parallel contact pieces 12 to 14 integrated with the base upper section thereof. Furthermore, the opposed inner edges of the pieces 12 and 14 at both sides are formed to have contact planes 12a' and 14' having a bent peripheral section and recessed surface to suit the outer surface of the electrodes 2a and 2b of the fuse 2. Also, the center contact piece 13 is bent approximately like a U-shape toward one side from the lower end of the base section thereof, and extended upward. Then, the end of the piece 13 comes in contact with electrode edges 2a' and 2b'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuse clip for mounting a glass tube fuse on a printed circuit board.

[0002]

2. Description of the Related Art A fuse clip for mounting a glass tube fuse on a printed circuit board allows easy attachment / detachment of the glass tube fuse and good mechanical retention, and is electrically and securely connected. It is required to be small in size in order to prevent the interference with the mounted parts. In particular, when the mounting machine automatically inserts the wiring board for automatic mounting, it is necessary that the mounting machine does not interfere with other mounting parts and that the fuse clip can be easily inserted. is there.

FIG. 6 shows a conventional fuse clip mounted on a printed circuit board by an automatic inserter.
And the shape shown in FIG. 7 is used. In this fuse clip 1, the left and right side portions 1a, 1a are bent as shown in the figure to make the lower portions 1b, 1b have a spring property, and the upper portion 1c, 1c elastically clamps the electrode 2a of the glass tube fuse 2. It was done like this. In this fuse clip 1, the legs 1d and 1d and the fall prevention piece 1e are inserted into the holes 4a, 4a and 4b of the printed circuit board 4 and soldered to the circuit pattern 5 to be fixedly connected.

A fuse clip (design registration No. 763598) as shown in FIG. 8 has also been proposed. In the fuse clip 3, the contact pieces 3 are formed by bending the lower portions of the left and right side portions 3a, 3a into substantially inverted U-shapes and bending them downward.
b, 3b, and the electrode 2a of the glass tube fuse 2 is elastically sandwiched between these contact pieces 3b, 3b. This fuse clip 3 has a leg portion 3d,
3d is inserted into the holes 4c and 4c of the printed board 4 and connected and fixed to the circuit pattern.

[0005]

However, the fuse clip 1 shown in FIGS. 6 and 7 has an automatic insertion machine which cannot be used due to its geometrical aspects, and the left and right side portions 1a, 1 are also provided.
Since the outer widths of the lower portions 1b and 1b of the a are wide, when electronic components are mounted on the printed circuit board with high density, it interferes with other adjacent electronic components, which makes mounting with high density difficult.
Further, since it is pressed into a complicated shape, it is extremely difficult to control the shape, which not only slows down the pressing speed, but also makes taping difficult.

Further, the fuse clip 1 shown in FIG.
Since the contact pieces 3b and 3b are in contact with the electrode 2a of the glass tube fuse 2 only by the plate thickness, the contact area is small, the current capacity cannot be made too large, and the strength is weak.
If the plate thickness is increased to increase the current capacity, the elasticity of the contact pieces 3b, 3b becomes low, which makes it difficult to attach / detach the glass tube fuse 2, and also the contact pieces 3b, 3b.
However, there is a problem in that plastic deformation is likely to occur and poor contact is likely to occur.

The present invention has been made in view of the above points, and has a simple shape and can be easily inserted by an automatic machine.
It is an object of the present invention to provide a fuse clip that can be mounted on a board mounted at high density.

[0008]

In order to achieve the above object, according to the present invention, a leg connected to and fixed to a circuit pattern of a substrate is provided at a lower end of a base, and an electrode of a glass tube fuse is held at an upper part of the base. In the fuse clip in which the parts are integrally formed, the holding part is formed by three contact pieces extending substantially in parallel above the base part, and the contact pieces on both sides extend from the upper end of the base part and face each other. A peripheral edge portion of a concave portion formed on the inner end surface corresponding to the outer peripheral surface of the electrode is bent to form a contact surface with the outer peripheral surface, and a central contact piece is substantially L-shaped from the lower end of the base portion to one side. It is configured to be bent and extend upward so that the tip portion comes into contact with the end surface of the electrode.

[0009]

In the fuse clip, the legs are inserted into the holes of the substrate and connected and fixed to the circuit pattern. 3 formed on the base
The electrodes of the glass tube fuse are mounted between the contact surfaces of the contact pieces on both sides of the book contact piece. The contact pieces on both sides elastically make surface contact with the outer peripheral surface of the electrode of the glass tube fuse to sandwich the electrode. The contact piece at the center elastically contacts the end face of the tip end to the end face of the electrode, and prevents the glass tube fuse from shifting in the axial direction. As a result, the fuse clip contacts the electrode of the glass tube fuse with a large contact area and holds the glass tube fuse well.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Fuse clip 1 as shown in FIGS.
0 is three contact pieces 12 to 1 facing upward from the base 11.
4 are formed substantially parallel to each other. Contact pieces 12, 14 on both sides
Are formed on both the left and right sides of the upper end of the base 11, and are bent in a substantially L shape from each root to one side. The center contact piece 13 is formed so as to extend downward at the center of the lower end of the base 11, and is bent from the lower end of the base 11 to the other side in a substantially L shape to be substantially parallel to the contact pieces 12 and 14 on both sides. Has been done. And
Contact pieces 12, 14 on both sides and a base 1 of the contact piece 13 in the center
The overhanging width from 1 is set to be substantially the same.

The contact pieces 12 and 14 on both sides are formed with arcuate recesses 12a and 14a substantially in the center of the facing inner end surfaces, and further, the peripheral edges 12a 'and 14a' are plate surfaces, for example, the contact pieces 13. It is bent at a right angle to the side and faces each other.
And, the concave peripheral edge portions 12a 'and 14a' facing each other
Is a part of a circle having substantially the same diameter as the outer diameter of the electrode 2a of the glass tube fuse 2 (FIG. 4) to be mounted, and a contact surface (hereinafter referred to as “contact Face 12
a ', 14a'"). Further, these contact surfaces 12a ', 14a' are opened in a slightly tapered shape from the upper part to the upper end, and the electrode 2a can be attached and detached through the opening part.

The contact piece 13 at the center is the inner side (contact piece 12,
14 side), and the upper end is slightly bent outward so that the end surface of the electrode 2a can be easily attached. The distance between the contact pieces 12 and 14 on both sides and the central contact piece 13 is shorter than the length of the electrode 2a of the glass tube fuse 2 (FIG. 4), for example, about half the length of the electrode 2a.
The contact pieces 12 and 14 on both sides have contact surfaces 12a ′,
14 a ′ is in surface contact with the outer peripheral surface of the electrode 2 a of the glass tube fuse 2 and sandwiches the electrode 2 a, and the center contact piece 13
Has an inner surface in contact with the end surface 2a 'of the electrode 2a. In addition, the horizontal portion 13a of the contact piece 13 that is bent into an L shape
Has a lower surface flush with the lower end of the base portion 11. When the fuse clip 10 is mounted on the board, the lower surface is brought into contact with the upper surface of the board to hold it vertically and prevent the tip from falling. Has become.

The lower end of the base 11 has legs 15, 16 on both sides.
Are formed so as to extend downward, and locking portions 15a and 16a for preventing slipping off are formed at the lower ends of the legs 15 and 16, respectively. This fuse clip 10 has legs 15, 1
6 is further extended from the locking portions 15a and 16a, and the substrate 17
It is installed continuously. And the fuse clip 10
The substrate 17 is attached to a strip-shaped mount 18 with an adhesive tape 19 and is taped. This fuse clip 10
Is supplied to the automatic insertion machine in a taped state, cut from positions immediately below the locking portions 15a, 16a of the legs 15, 16 and inserted into the holes of the printed circuit board.

The fuse clip 10 is punched from a plate material having conductivity and spring properties by press working,
The contact pieces 12 to 14 and the contact surfaces 12a 'and 14a' are formed by bending. The fuse clip 10 is
By bending the contact surfaces 12a 'and 14a' and using the material surface as the contact surface with the electrode 2a of the glass tube fuse 2, a pre-plated plate material can be produced by press working, and punching processing is performed. The rear contact surface 12a ', 1
4a 'plating process is unnecessary. Further, the punching direction of the press, the contact pieces 12 to 14 and the contact surfaces 12a ′, 14
Since the bending direction of a'is the same as the bending direction, the processing is facilitated and the press speed is improved.

The operation will be described below. In the fuse clip 10, as shown in FIG. 5, legs 15 and 16 are inserted into holes 4a and 4a formed at predetermined positions of the printed circuit board 4, respectively, and the lower surface of the horizontal portion 13a of the contact piece 13 at the center is the substrate 4. Abut the upper surface of. The fuse clip 10 has a contact piece 13
The horizontal portion 13a prevents the inclination of the horizontal portion 13a and holds the printed circuit board 4 substantially vertically. In this manner, the pair of fuse clips 10 and 10 are attached to the printed circuit board 4 so that the central contact pieces 13 and 13 face each other inward, and the legs 15 and 16 of the fuse clips 10 are
It is soldered and fixed to a circuit pattern (not shown) formed on the lower surface of the printed board 4. In this way, the fuse clips 10 and 10 are vertically mounted and fixed to the printed circuit board 4.

The glass tube fuse 2 has electrodes 2a at both ends,
2b is inserted between the opposing contact pieces 12 and 14, 12 and 14 from the upper opening of the fuse clips 10 and 10. The electrode 2a has a contact piece 12,
The contact piece 13 is pushed between the contact surfaces 12a 'and 14a' while the contact piece 13 is slightly expanded outward by the end surface 2a 'while the contact piece 14 is moved left and right. The contact pieces 12, 14 are the contact surfaces 12
a ', 14a' elastically contact and sandwich the electrode 2a,
The contact piece 13 elastically contacts the end surface 2a ′ of the electrode 2a. In this way, the electrode 2a is connected to the fuse clip 1.
It is attached and held at 0. The electrode 2b is also mounted and held on the fuse clip 10 in the same manner as the electrode 2a.

The glass tube fuse 2 has electrodes 2a on both ends,
The end faces 2a ', 2b' of the 2b are the fuse clips 10, 1,
The zero contact pieces 13, 13 are sandwiched between the contact pieces 13, so that axial displacement during mounting is prevented and displacement after mounting is also prevented. Further, in the glass tube fuse 2, the outer peripheral surfaces of the electrodes 2a and 2b are contact surfaces 12a 'and 14a', and the end surfaces 2a 'and 2b' are contact pieces 1.
A large current capacity can be obtained because the upper surfaces of the electrodes 3 and 13 are in surface contact with each other.

In the above-described embodiment, the fuse clip 10 has the contact pieces 12 and 14 on both sides in one side at the upper end of the base 11, and the contact piece 13 in the center from the lower end of the base 11 to the other side in a substantially L shape. Formed by bending, but contact pieces 1 on both sides
It is not always necessary to fold both 2, 14 and the central contact piece 13 into an L shape. The contact pieces 12, 14 should be straight, and only the central contact piece 13 should be bent into the L shape. Good.

[0019]

As described above, according to the present invention, the shape of the fuse clip is extremely simple, and the shape management and work are easy. Further, since the shape of the fuse clip is simple, it is possible to use various automatic insertion machines when inserting the fuse clip into the board. Further, the fuse clip can be miniaturized, and it is possible to prevent interference with other electronic components adjacent to the fuse clip when the fuse clip is automatically inserted into the high-density mounting board. Furthermore, the fuse clip is formed by pressing the pre-plated plate material by forming the contact surface by bending and using the material surface as the contact surface with the electrode of the glass tube fuse.
Moreover, the plating process of the contact surface after the punching process is unnecessary, and the cost can be reduced. Furthermore, since the punching direction of the press is the same as the bending direction of each contact piece and the contact surface, the processing is facilitated, the press speed is improved, and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a fuse clip according to the present invention.

2 is a plan view of the fuse clip of FIG. 1. FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a perspective view of a main part of the fuse clip shown in FIG.

5 is a perspective view showing a state in which a glass tube fuse is mounted on a printed circuit board by the fuse clip of FIG.

FIG. 6 is a front view showing an example of a conventional fuse clip.

FIG. 7 is a side view taken along the line VII-VII in FIG.

FIG. 8 is a perspective view showing another example of a conventional fuse clip.

[Explanation of symbols]

 2 Glass tube fuse 2a, 2b Electrode 4 Printed circuit board 10 Fuse clip 11 Base 12-14 Contact piece 12a'14a 'Contact surface 15, 16 Legs 17 Substrate 18 Mount 19 Adhesive tape

Claims (1)

[Claims] 1. A fuse clip in which a leg connected to and fixed to a circuit pattern of a substrate is formed at a lower end of a base portion, and a holding portion for an electrode of a glass tube fuse is integrally formed at an upper portion of the base portion, wherein the holding portion is The contact pieces are formed by three contact pieces extending substantially parallel to the base, and the contact pieces on both sides extend from the upper end of the base and have a peripheral edge of a concave portion formed on the inner end surfaces facing each other according to the outer peripheral surface of the electrode. The part is bent to form a contact surface with the outer peripheral surface, and the central contact piece is bent from the lower end of the base part to one side in a substantially L shape and extends upward to contact the end face of the electrode with the tip part. A fuse clip characterized by being.