JPS5831693B2 - fuse base - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuse base in which the receiving blade of the rectangular contact piece of the fuse element is protected from erroneous contact by an attached protective cap.

Such a protective cap is known from German Patent Application No. 2,401,030.

This type of fuse base for a fuse element of a low-voltage, high-current fuse, generally referred to as an NH fuse for short, is usually arranged vertically in a distribution panel.

A number of fuse bases are arranged laterally adjacent to each other.

Particularly in the case of multi-pole devices, therefore, an almost horizontal surface is created on top of the protective cap arranged above, on which it is desirable to place tools or parts during maintenance or repair work. .

Such storage areas can lead to accidents if the equipment is closed.

This is especially the case when the protective cap is provided with a through slit and the side surfaces of the blade-shaped contact pieces are somewhat close to the outer disk of the protective cap.

It is difficult to provide ventilation as expected for a sealed protective cap.

In extensively sealed constructions and aggressively compacted arrangements, heat dissipation to the surrounding air is permanently prevented within the overall system of NH fuses.

This also impairs the operating accuracy of the fuse set.

The invention aims to avoid the above-mentioned disadvantages in the device of a protective cap, on the one hand, by preventing the formation of a storage area for tools, and on the other hand, by ensuring that the ventilation is unobstructed.

This purpose, according to the present invention, is such that when assembled, the protective cap has an inclined surface in the form of an inclined pile with respect to the bottom surface of the fuse base, and the ridge line of the corner to the inclined surface is relative to the plane containing the moon-shaped contact piece. This is achieved by providing ventilation slits on the side facing the fuse element on both sides of the fuse element.

In a fuse base configuration in which the spring-supported receiver has a blade and a contact, the protective cap has a retaining means that engages behind the spring of the counter-contact, and the receiver has a guide surface that coincides with the counter-contact. Be prepared.

In such a fuse base, since the protective cap is connected to the non-conductive part, it can be made from a cost-effective insulating material, such as a thermoplastic synthetic resin.

In the normal case, the protective cap is connected to the conductive part of the counter contact.

In the case of the holding device according to DE 2.401.030, the protective cap is screwed onto the conductive connection to the counter-contact.

According to West German Utility Model No. 7.245.190, the protective cap is snapped directly onto the electrically conductive contacts.

Such protective caps must be made from expensive high-grade insulators.

The ventilation slit on the side facing the fuse element can be formed laterally next to the through groove for the moon-shaped contact piece of the fuse element.

By doing this, the receiver and the contact point remain insulated from contact with the outside world.

An opening above the engagement position on the protective side of the protective cap allows the disengagement tool to be guided through this opening.

It is also possible to connect the moon-shaped contact piece to the fuse element if the protective cap is provided with an opening for the moon-shaped contact piece on the side that performs its protective function, and if the receiver is extended inward in line with the guide edge of the blade. This will prevent it from getting caught on the protective cap when you pull it out.

The protective cap can also be provided with means for laterally holding the partition wall.

Advantageously, these partitions attached to the protective cap have a side profile with an inclination approximately in line with the inclination of the protective cap.

By doing so, it is ensured that the bulkhead between adjacent fuse bases also, in its installed state, does not create a horizontal surface on which its top end would be tempting to place objects.

The invention will now be described in detail on the basis of an embodiment schematically shown in the drawings.

The fuse base 1 shown in FIG. 1 has a counter contact 2 and a moon-shaped contact piece 3 (see FIG. 2).

The attached protective cap 4 protects the contact 2 of the receiver, the moon-shaped contact piece 3, and the connection terminal 5 of the power supply conductor to the contact of the receiver from contact.

The protective cap 4 has a sloped pile-like shape with respect to the bottom surface of the fuse base, which is considered perpendicular to the drawing in FIG. A sloped portion is provided so as to pass through.

As shown in FIG. 1, the moon-shaped contact piece is then in the plane of the drawing.

Further, the corner of the sloped pile-shaped desk of the protective cap is indicated by 6.

On its side facing the fuse element 7, the protective cap 4 has on two adjacent sides, as shown in FIGS. 4 to 6,
It has ventilation slits 8.

Also in an embodiment, in order to save the material of the protective cap, it is provided with reinforcing ribs, whereby the first
Many slopes occur, as seen by line 28 in the figure.

The protective cap 4 is provided with engagement means 9 on its elastic wall 10, as is clear from FIGS. 4, 6 and 8.

This retaining means 9 engages behind a spring 11 which serves to strengthen the counter-contact 2 in its spring action.

Furthermore, the protective cap 4 has a receptacle associated with the counter-contact 2, and the receptacle is guided by a guide rib 12 which coincides with the counter-contact 2.

On the contact counter 2 side of the bridge, a tab 13 is used for this purpose, the tab 13 simultaneously serving as a stop for the rectangular contact piece of the fuse element which the bridge is placed on counter contact 2.

The ventilation slit 8 in the protective cap according to FIG.
A through groove 14 for the rectangular contact piece 3 in the fuse element 7 is formed on the side surface.

In the embodiment, this ventilation slit 8 is provided above the corner of the adjacent side wall, as can be seen in FIG.

The protective cap 4 can also be provided with an opening 15 on its protective side above the locking position, as can be seen in FIGS. 3 and 4.

Also, when the protective camp 4 is provided with a through groove 14 for the rectangular contact piece 3 on its protective side, the receiver is extended inwardly with respect to the guide edge 16 of the blade 2, as can be seen in FIG.

Further, the holding means for the partition wall 17 is formed on the side of the protective cap 4.

The partition wall 17 attached to the protective cap in this manner has a slope in its side surface so as to be in line with the slope of the protective cap.

This can be seen by comparing these contour lines 28 and 18 in FIG.

As explained above, this invention provides a fuse base in which the blade of the rectangular contact piece of the fuse element is protected against contact by an attached protective cap, and the protective cap is located on the possible bottom surface of the fuse base. on the other hand, it has an inclined surface in the form of a sloped pile, the corner to the inclined surface passes perpendicularly to the surface with the rectangular contact piece, and the protective cap is attached to two adjacent sides on the side facing the fuse element. By providing ventilation slits,
In addition to preventing the danger of tools being stored on top of the protective cap, it is also possible to easily create a protective cap that does not block ventilation by using an economically advantageous insulating material such as thermoplastic synthetic resin. There is.

[Brief explanation of drawings]

1 is a partial longitudinal section of a fuse base according to the invention with a bulkhead installed; FIG. 2 is a side view of the fuse base according to FIG. 1 with a fuse element inserted; FIG. Figure 4 shows three fuse bases placed adjacent to each other with a partition between them, and Figure 4 shows the juxtaposition of the three fuse bases in Figure 3, viewed from below, so that you can see how they are installed. , along cutting line IV-IV in Figure 3, the fuse base on the left is not sectioned, the center fuse base is sectioned at its center, and the fuse base on the right is sectioned at the blade contact point. The following figure shows the diagram. Also, Fig. 5 shows a protective cap corresponding to the fuse base in the center of Fig. 4, Fig. 6 is a side view of the protective cap shown in Fig. 5, Fig. 7 is a front view of the protective cap shown in Fig. 6, and Fig. 8 6 shows a sectional view taken along the cutting line ■--■ of the protective cap in FIG. 1: fuse base, 2: receiver is the blade contact, 3: square contact piece, 4: protective cap, 6: ridgeline of the corner to the slope of the protective cap, ? : Fuse element, 8: Ventilation slit,
9: engagement means of the protective cap, 11: spring, 12: guide rib of the protective cap, 14: through hole, 15: opening provided in the protective cap, 16: guide edge, 17: partition wall.

Claims (1)

[Claims] 1. In a fuse base where the rectangular contact piece of the fuse element is protected from accidental contact by a protective cap with a blade, when the protective cap is attached to the fuse base, On the other hand, it has a sloped surface in the form of a sloped pile, and is formed so that the corner ridge line to the sloped surface passes perpendicularly to the plane containing the rectangular contact piece, and the protective cap is attached to the side facing the fuse element. The fuse base is characterized by having ventilation slits on both sides adjacent to it. 2. In the fuse base according to claim 1, the spring-supported bridge has a blade contact, and the protective cap has a retaining means that engages behind the spring of the blade contact. , a fuse base characterized in that the guide lip of the protective cap coincides with the blade contact point. 3. The fuse base according to claim 1 or 2, characterized in that the ventilation slit is formed near the through groove for the square contact piece. 4. In the fuse base according to claim 1, 2, or 3, an opening is formed in the protective cap above the contact piece retaining position on the side facing the operator. A fuse base characterized by: 5. In the fuse base according to any one of claims 1 or 2 to 4, when the protective cap provides a through groove for the rectangular contact piece on the side facing the operator. A fuse base characterized in that the fuse base is extended inwardly relative to the guide edge. 6. The fuse base according to any one of claims 1 or 2 to 5, characterized in that the protective cap is formed with a lateral holding means for the partition wall. . 7. The fuse base according to claim 6, wherein the partition wall has a side surface having an inclination that forms a sea line with the inclination of the protective cap.