JPS5824368Y2 - electrical contacts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical contact, for example an electrical contact suitable for connection with a fuse having a flat contact tongue.

Conventionally, for example, a contactor applied to a fuse block is a substantially U-shaped contactor B that holds a cylindrical fuse A as shown in FIG.
In this conventional structure, the contactor B is attached to the base C by penetrating the mounting hole of the contactor B and being locked to the base C by a cut-and-raised tongue piece provided on the contactor B. In addition, contact B may be deformed during assembly, resulting in incomplete retention of the cut-and-raise tongue, or poor contact with fuse A, resulting in increased contact resistance. Contactor B generates heat, and the heat is transmitted to fuse A, causing problems such as the fuse blowing out even under normal current.

On the other hand, in order to improve the productivity of fuses, a pair of parallel terminal tongue pieces 1 were punched out of a metal plate as shown in Figure 2.
A fuse 1 (hereinafter referred to as a plate fuse) has also been proposed in which a fusible body 1d that connects a and lb and both pieces are integrally formed and housed in a housing 1C made of an insulating material. This is an electrical contact that can also efficiently hold a plate-shaped fuse in contact.

That is, the present invention provides a convenient electrical contact in combination with the above-mentioned plate-shaped fuse 1, and is intended to solve the problems caused by the conventional structure described above.

Next, an embodiment in which the present invention is implemented as an electric contact for a fuse will be described in detail with reference to the embodiment shown in FIGS. 2 to 5.

Reference numeral 1 designates the plate-shaped fuse 1 mentioned above, which includes a pair of terminal tongues 1a and lb spaced apart on a plane, and a fusible body 1d between the terminal tongues 1a and 1b. are integrally combined and housed and fixed in a housing 1C made of an insulating material.

Reference numeral 2 denotes an electrical contact which is to contact and hold the terminal tongue 1a or 1b of the plate-shaped fuse 1.The structure of this electrical contact 2 will be explained below.

The electric contact 2 has a wire fixing part 2a made of a conductive plate material,
A bottom plate 2b that is axially continuous with the wire fixing part 2a, a side plate 2C that stands up from both sides of the bottom plate 2b at a substantially right angle, and a side plate 2C that extends further forward so as to converge with each other and near the tip. A pair of contact tongues 2d are formed with a bent portion 2g so as to expand again at the bottom plate 2b, and a locking hole 2e for a fuse block 3, which will be described later, is formed in the bottom plate 2b. Both side plates 2C are provided with cut and raised protrusions 2f, and the pair of contact tongues 2d are provided with longitudinally opposing protrusions 2h extending from the side plates 2C to the bent portions 2g of the contact tongues 2d. It is being

The pair of contact tongues 2d are located at the top of the protrusion 2h in the vicinity of the bent portion 2g, and the terminal tongues 1a of the plate-shaped fuse 1
1b, and at the rear of the wire fixing part 2a, a chain band fixing part 21 for connecting in parallel with other electrical contacts is further formed by bending on both sides of the bottom plate. A rib 2j is provided on the portion to improve its rigidity.

Next, we will discuss the structure of the fuse block 3 that holds the two electrical contacts 2 as a pair. This fuse block 3 is made of synthetic resin, which is an insulating material.
A pair of contact receiving holes 3a each having a substantially square cross section for accommodating the electrical contacts 2 are arranged side by side with a partition wall 3b interposed therebetween.
An elastic stopper piece 3d that extends forward and can be engaged with the locking hole 2e of the electric contact is integrally formed on the bottom wall surface 3C of the contact housing hole 3a facing b.

Further, in the opposing side wall 3e of the contact housing hole 3a, a guide groove 3f into which the cut and raised projection 2f of the electric contact is fitted is provided in the axial direction, and further in front of the contact housing hole 3a, A protective wall 3g is provided to guide and hold the housing 1C of the plate-shaped fuse 1, and a guide groove 3h is formed in the protective wall 3g to fit with a longitudinal protrusion 1e provided on the housing 1C of the plate-shaped fuse. There is.

Note that 31 is a recess for engaging the spare fuse 1';
is an electric wire connected to the electric contact 2.

The above is the structure of the present invention-embodiment.Next, its operation will be described.When a pair of electric contacts 2 having the above structure are inserted into the contact receiving hole 3a of the fuse block 3 with the electric wires fixed, A solid cut-and-raised protrusion 2f protruding from the side surface of the electric contact 2 is connected to a guide groove 3f of the fuse block 3.
When the electrical contact 2 is further inserted, the elastic locking piece 3d is elastically displaced upward by the bottom plate 2b of the electrical contact, allowing the electrical contact 2 to be inserted.

When the edge of the locking hole 2e provided in the electric contact passes the front end surface of the elastic locking piece 3d, the elastic locking piece 3d returns to its original position, and the elastic locking piece 3d is inserted into the locking hole 2e. The front end is inserted and the electrical contact is prevented from coming off.

Furthermore, even if the electric contact is not inserted further, the cut-and-raised protrusion 2f of the electric contact comes into contact with the end of the guide groove 3f of the fuse block 3, and the electric contact 2 cannot be inserted any further, so that the electric contact does not engage with the fuse block 3. will be stopped.

The electrical contact 2 incorporated in the fuse block 3 has its side plate 2C and cut-and-raised protrusion held by the side wall 3e of the contact receiving hole 3a, the partition wall 3b, and the guide groove 3f, and the electrical contact 2 is stable with less swinging. is maintained.

To connect the plate-shaped fuse 1 to the electrical contact 2 housed in the fuse block 3 as described above, insert the plate-shaped fuse 1 from the front into the contact housing hole 3a of the fuse block 3, The protrusion 1e provided on the housing 1C of the fuse 1 is connected to the guide groove 3h of the fuse block 3.
The terminal tongues 1a, lb of the plate-shaped fuse 1
The tip of the electric contact 2 enters between the pair of expanded contact tongues 2d, and is pressed and clamped at the top of the protrusion 2h provided on the inside of the bent portion 2g of both contact tongues 2d.

At this time, the protrusion 2h improves the rigidity of the contact tongue piece 2d, makes insertion of the terminal tongue piece 1a or 1b of the plate-shaped fuse 1 smooth, and increases the contact pressure by limiting the contact area, thereby ensuring reliable operation. It has the effect of obtaining electrical connection.

When the plate-shaped fuse 1 is further pressed in the insertion direction, the end face of one side of the terminal tongue of the housing 1C of the plate-shaped fuse comes into contact with the front end face of the partition wall 3b of the fuse block 3, which acts as a stopper and prevents the connection of the plate-shaped fuse. Complete.

Note that when the plate fuse 1 is connected, the housing 1C of the plate fuse 1 is connected to the protective wall 3 of the fuse block 3.
g, even if an unexpected external force is applied, the plate-shaped fuse and the electrical contact are prevented from being damaged, and the electrical connection is also prevented from being disturbed.

As described above, the present invention provides contact housing holes 3a of a block made of an insulating material, such as a fuse block 3.
In the electrical contact 2 housed in the electrical contact 2, there is a bottom plate 2b continuous to the wire fixing part 2a, a side plate 2C that stands continuously from both sides of the bottom plate 2b, and a side plate 2C that extends forward from the side plate so as to converge with each other. Bend part 2 so that it expands again near the tip.
a pair of contact tongues 2d having a radius of A locking portion that engages with an elastic locking piece 3d provided in the hole 3a, for example, a locking hole 2e, and a locking portion that fits into an axial guide groove 3f that protrudes from the side plate 2C and is provided in the contact receiving hole 3a. According to the present invention, since the shape of the contact tongue piece 2d that facilitates electrical connection is simple, it is easy to mold the contact tongue piece with a press. The rigidity of the contact tongues 2d is increased by the action of the protrusions 2h provided on the contact tongues 2d, and the terminal tongues 1a or 1b inserted between the contact tongues 2d are smoothly inserted, and the contact area is Since the contact pressure is limited, a high contact pressure can be obtained and a highly reliable electrical connection can be obtained.

Furthermore, since the contact tongue piece 2d of the present invention has a widened structure near its tip, the inserted terminal tongue piece is naturally centered in the center, and the connection can always be made reliably.

Furthermore, since the expanded shape of the electrical contact of the present invention has generally the same width, the metal plate material can be used without wasting it, contributing to low cost and resource saving. Since it does not have a protruding part that extends toward the wire, when it is handled together with electric wires without being housed in a block during the wiring harness manufacturing process, there is no inconvenience such as entanglement with other electric wires, and there is no risk of deformation during handling. It has the following characteristics:

[Brief explanation of the drawing]

Figure 1A and Figure 1A are perspective views and sectional views showing the structure of a conventional fuse block assembly, and Figure 2A is an electric contact according to an embodiment of the present invention, in which the wires are not fixed. FIG. 2 is a perspective view of a plate-shaped fuse connected to the electrical contact, FIG. 3 is a sectional view showing the electrical contact housed in the fuse block, and FIG. FIG. 5 is a sectional view taken along the line 1--2 in FIG. 4. 1...Plate fuse, LA, LB...
Terminal tongue piece, 1C...Housing, 1d...
... Fusible body, 1e ... Protrusion, 2 ... Electric contact, 2a ... Wire fixing part, 2b ...
... Bottom plate, 2C ... Side plate, 2d ... Contact tongue piece, 2e ... Locking hole, 2f ... Cut and raised projection, 2g ... ...Bending part, 2h...
・Protrusion, 21... Chain band fixing part, 3...
・Fuse block, 3a...Contact housing hole,
3b...Partition wall, 3C...Bottom wall, 3d...
...Elastic locking piece, 3e...Side wall, 3f.
...Guide groove, 3g...Protection wall, 3h...
...Guide groove, 31...Spare fuse holding recess.

Claims (2)

[Scope of utility model registration request] (1) The electrical contact 2 accommodated in the contact accommodation hole 3a of the block 3 made of an insulating material has a bottom plate 2b continuous to the wire fixing part 2a, and is erected continuously from both sides of the bottom plate 2b. a pair of contact tongues 2d extending forward from the side plate 2C so as to converge with each other and having a bent portion 2g so as to widen again near the tip; a pair of opposing protrusions 2h provided in the longitudinal direction extending to the bent portion 2g; and an elastic locking piece 3 provided on the bottom plate 2b and provided in the contact receiving hole 3a.
d, and a protrusion 2f that protrudes from the side plate 2C and fits into an axial guide groove 3f provided in the contact receiving hole 3a. Child. (2) The locking portion 2e is a locking hole, and the projection 2f is a cut-and-raised projection having a cut-and-raised surface perpendicular to the side plate on the front thereof.
Electrical contacts listed in ).