JPS634357Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fuse holding device for a closed power distribution board in which the power fuse is removable.

[Conventional technology]

FIGS. 7 and 8 are a front view and a side view showing an embodiment of a power receiving board having a fuse holding device, and a power fuse is provided for each phase within the housing of the power receiving board. This fixed type power fuse is required to be easy to attach and detach the fuse link from the upper and lower holding parts of the fuse link. In the diagram, 1 is bushing, 2 is fuse link, A, B
are the upper and lower holding parts of the fuse link, respectively.

Conventionally, the method of holding this type of fuse link has been to use a fixed side case and cover device for the purpose of mitigating the electric field, so that when the cover is opened, the fuse link can be attached and detached with light force.
When the cover was closed, there was a device that held the fuse link with strong force to ensure that the electricity was turned on.

FIG. 9 shows a conventional embodiment, in which the hinge part H of the cover
On the line connecting the center of the fuse link 22 and the center of the fuse link 22 (line -
) The roller 25 located further back is the positioning metal fitting 2.
6 and the center of the fuse link 22 (line -), the fuse link 22
This prevents the object from flying out and holds it in place.

[Problem that the invention attempts to solve]

However, this method had the following problems.

(1) The mechanism is complex, requiring a high degree of dimensional accuracy in the molding accuracy of the positioning metal fitting 26, the mounting accuracy during assembly, and the positional relationship between the hinge portion fulcrum H of the cover and the roller 25.

(2) Even the parts that directly hold the fuse link 22 include the positioning metal fitting 26, the conductive clip 2
7. Many parts such as leaf springs 28 and 29 were required.

The present invention aims to solve these conventional problems and provide a cheaper fuse holding device.

[Means for solving problems]

The present invention is a symmetrical unit that is attached to the stationary case with one end facing both sides of the fuse link, has an arcuate surface along the cylindrical surface of the fuse link in the center, and has a curled part at the tip. a set of fuse clips, one end of which is supported by a hinge on the fixed side case;
By providing a cover having a pressing surface for pressing the curled portion of one of the fuse clips on the inner surface near the support portion and a roller for engaging the curled portion of the other fuse clip at the distal end, the above-mentioned This is an attempt to solve problems.

〔Example〕

Hereinafter, the present invention will be explained based on the embodiment shown in the drawings. Figures 1 and 2 are a plan view and a front view showing the embodiment of the present invention, and in these figures, the fuse link 2 is loaded. , the cover 4 is shown attached, and the bushing 1 supporting the entire fuse holding device is fixed to a side plate (not shown) of the closed switchboard. Fuse clips 10 and 11, which are made of a highly conductive spring material and have curled tips, are attached to the stationary case 3 supported by the bushing 1 with bolts 12 and spring washers 13. By hooking one end 15a of the torsion spring 15 wound around the pan head screw 14 forming the hinge portion H to the cover end 4a, and hooking the other end 15b to the spring receiving portion 3a of the fixed side case, the cover 4 is attached. There is a twisting force at work that can always lead to an open state. The cover 4 is always open except when the roller 5 attached to the tip of the cover is securely engaged with the curled portion of the fuse clip 11.

In this embodiment, the shape of the fuse clip is simply formed in the longitudinal direction of a thin plate as shown in Fig. 3, but when the thickness of the fuse clip becomes thick, such as when the current carrying capacity is large, Since a strong force is required to attach and detach the fuse link and attach the cover, in order to reduce this force, it is possible to machine a slit as shown in FIG. 4 to reduce the spring constant. Further, in order to make the contact between the fuse link and the fuse clip a multi-point contact, the fuse clip may be provided with a large number of protrusions. (See Figure 5). Also,
You can round the edge of the fuse clip to make it easier to attach and remove the fuse link (see Figure 6), or you can use a combination of some of the above Figures 3 to 6. can.

[Effect of idea]

As described above, the present invention has the following effects.

(1) Since the only parts that directly hold the fuse link 2 are the fuse clips 10 and 11, the number of parts is reduced compared to conventional products, and the structure is very simple. Therefore, parts production and assembly become easier.

(2) Cull portions 10a and 11a of the fuse clip rising from the cylindrical curved surface of the fuse link 2
The cover 4 is pressed by the pressing surface 4b of the cover on one side, and the roller 5 is applied on the other side when the cover 4 is pressed against the fixed side case 3.
will be installed on the The curled portions 10a, 11a can be pressed in a large amount, the cover 4 can be securely attached, and the fuse link 2 can be strongly held.

(3) Since the torsion spring 15 is always acting on the cover 4, if the roller 5 is attached halfway to the curl 11a, the cover 4 is released from the fixed case 3 by the torsion spring 15. It has a fool-proof function that does not allow the cover to be attached half-heartedly.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a front view thereof, Figs. 3 to 6 are perspective views each showing an embodiment of the cover, and Fig. 7 shows the structure of the power receiving board. FIG. 8 is a front view, FIG. 8 is a side view, and FIG. 9 is a plan view showing the structure of a conventional fuse holding device. 1: Bushing, 2: Fuse link, 3: Fixed side case, 4: Cover, 5: Roller, 10,1
1: Fuse clip, 10a, 11a: Curled portion, 12: Bolt, 13: Spring washer, 14: Pan head screw, 15: Torsion spring.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a closed switchboard with removable power fuses, each end is attached to the fixed side case with one end facing both sides of the fuse link, and the center part runs along the cylindrical surface of the fuse link. A pair of symmetrical fuse clips each having an arcuate surface and a curled portion at the tip, one end of which is supported by a hinge on the fixed side case, and the curled portion of one of the fuse clips is pressed against the inner surface near the supporting portion. 1. A fuse holding device comprising: a cover having a pressing surface and having a roller at a distal end thereof that engages with a curled portion of the other fuse clip. 2. The fuse holding device according to claim 1, wherein the cover has a torsion spring at its hinge portion that biases the cover in the opening direction.