JPS597718Y2 - fuse holder - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a fuse holder.

In the past, the cap and cap metal fitting of a fuse holder were usually formed as one piece, but this method had disadvantages of high cost and severe wear of the mold.

Therefore, an object of this invention is to provide a fuse holder that eliminates the drawbacks of the conventional fuse holder cap and cap metal fitting structure.

An embodiment of this invention will be described based on the drawings.

First of all, the fixed cylinder 1 of the fuse holder is described.The fixed cylinder 1 is made of a resin material and has a flange 2 at its upper end. A male threaded portion 3 is disposed at the male threaded portion 3, and the fixing tube 1 is fixed to a device between a nut 4 hinged to the male threaded portion 3 and the collar portion 2.

A fuse insertion hole 5 is provided inside the fixed tube 1, a fuse (not shown) is provided in the fuse insertion hole 5, and a lower terminal 6 is provided at the bottom of the fuse insertion hole 5. The lower terminal 6 is pressed upward by a spring 6a, and an upright piece 6 disposed below the lower terminal 6
It is locked at b.

Further, the upper part of the fuse insertion hole 5 is formed to have a large diameter, and a ring part 7b of the upper terminal 7 is inserted into this large diameter part 8, and a female screw 7a is arranged on the inner periphery of this ring part 7b. , and an external connection piece 7C connected to the lower edge of the ring portion 7b projects outward from the through hole 1a formed in the fixed tube 1, and a part of this external connection piece 7C is erected to form an erected piece. 7d to fix the upper terminal 7 to the fixed tube 1.

A cap metal fitting is hinged to the male screw 7a of the upper terminal 7.

Next, we will talk about the cap metal fitting 10. This cap metal fitting 10 is shaped by cutting a hexagonal bar.
The hexagonal part 11 is shaped as an uncut hexagonal bar,
A male threaded portion 12 is provided at the bottom of the hexagonal portion 11, a locking portion 13 is provided at the top of the hexagonal portion 11, a concave locking portion 15 is provided on the outer periphery of the hexagonal portion 11, and A fuse insertion hole 14 into which the upper end portion of a fuse (not shown) is inserted is provided at the center of the cap metal portion 10.

Next, the cap 2 is assembled integrally with the cap fitting 10.
0 is made of resin material and has a cap metal fitting 20 on the bottom surface.
A hexagonal hole 21 into which the hexagonal portion 11 is inserted is provided, and a convex locking portion into which the concave locking portion 15 of the cap fitting 20 is press-fitted and engaged is provided on the upper inner periphery of the hexagonal hole 21. 22 are arranged.

Next, the method of assembling the cap 20 and the cap metal fitting 10 will be described. The concave locking part 15 provided on the upper part of the cap metal fitting 10 and the convex locking part 22 of the cap 20 fit together,
Also, a cap metal fitting 10 is provided in the hexagonal hole 21 of the cap 20.
The hexagonal part 11 is inserted and arranged.

In this case, the hexagonal part 11 of the cap metal fitting 10 inserted into the hexagonal hole 21 of the cap 20 is shaped so that only the upper part of the hexagonal part 11 is inserted into the hexagonal hole 21 of the cap 20.

Next, cap 20 is attached to fixed tube 1 of the fuse holder. ′, when the male screw 12 of the cap metal fitting 10 is hinged to the female screw 8 of the upper terminal 7 of the fixed cylinder 1 and the cap 20 is rotated, the male screw 12 of the cap metal fitting 10 and the upper As the hinge of the female screw 7a of the terminal 7 advances, the lower surface of the hexagonal portion 11 of the cap metal fitting 10 comes into contact with the counterbore surface of the counterbore portion 9 of the fixed tube 1.

In this case, a fuse (not shown) is arranged between the lower terminal 6 of the fixed cylinder 1 and the fuse insertion hole 14 of the cap metal fitting 10, and the cap metal fitting 10 is hinged to the female screw 7a of the upper terminal 7. Accordingly, the lower terminal 6 is pressed downward against the pressing force of the spring 6a, and the fuse (not shown) is housed in the fuse holder.

In this case, since the hexagonal part 11 of the cap fitting 10 is interposed between the lower surface of the cap 20 and the upper surface of the flange part 2 of the fixed cylinder 1, a slight gap is always provided.

Therefore, even if the cap 20 is tightened, the cap metal fitting 10
No force is applied between the cap 20 and the concave locking portion 15 of the cap fitting 10 and the cap 2.
The convex locking portion 22 of 0 will not come off.

As mentioned above, in the fuse holder of the present invention, the cap and the cap metal fitting can be manufactured separately, and then the two can be assembled together. This simplifies the mold, prevents abrasion of the mold, and makes it easier and cheaper to manufacture.

In addition, since the cap and the cap metal fitting fit together the convex locking part and the concave locking part, and the polygonal hole and the polygonal part, the two are tightly fitted and fixed and cannot be removed or rotated from the cap metal fitting. Never.

Then, a counterbore part is formed in the fixing tube to accommodate the lower half of the polygonal part of the cap metal fitting so that the live part does not appear on the outside, and the counterbore part is lower than the height of the polygonal part. By making it shallow, even when the cap and the fixed tube are screwed together and tightened, there is a gap between the bottom surface of the cap and the top surface of the fixed tube, so that the cap will not come off from the cap fitting.

Furthermore, since the cap metal fitting has a polygonal part on its outer periphery, the cost of cutting the cap metal fitting can be reduced by cutting it from a polygonal bar and using the polygonal part as it is, for example.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the fixed cylinder, cap metal fittings, and cap.
FIG. 2 is a perspective view of the cap metal fitting and the cap assembled together, and FIG. 3 is a sectional view of the cap assembled to the fixed tube.

Claims (1)

[Scope of utility model registration request] A fixing cylinder made of a synthetic resin material, which has a lower terminal that contacts one terminal of a cylindrical fuse housed in the lower part of the fuse insertion hole that is open at the top, and an upper terminal that is fixed in its position; A cap fitting that accommodates the other terminal of the cylindrical fuse in a fuse insertion hole whose lower part is screwed inside the terminal and opens downward, and a cap made of a synthetic resin material that covers this cap fitting. A polygonal hole is formed on the lower surface, and a convex locking part is formed on the upper circumference of the inner circumference of this polygonal hole, and the cap metal fitting has a convex locking part of the cap on the upper outer periphery. A concave locking part that fits with the cap is formed, and a polygonal part is formed on the outer periphery of the lower part of the convex locking part to fit the polygonal hole of the cap and the upper half of the cap. The cap metal fitting is fitted and fixed, and the fixed cylinder has a counterbore shallower than the height of the lower half of the polygonal part of the cap metal fitting on the upper opening edge of the fuse insertion hole, and the cap metal fitting is attached to the fixed cylinder. A fuse holder characterized in that when the cap is pressed, a gap is formed between the lower surface of the cap and the upper surface of the fixed tube.