JPH019090Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a structure for attaching a fuse clamp for attaching a fuse link in a switch with a current limiting fuse.

Purpose The purpose of this invention is to provide a structure for attaching a fuse clamp to a fuse support base, which allows for easy positioning when installing a fuse clamp to a fuse support base, and prevents rotation of the fuse clamp. be.

Embodiment An embodiment of this invention in an air switch with a current-limiting fuse will be explained below with reference to FIGS. 1 and 2. As shown in FIG. The mounting base 1 is bent between a pair of left and right fixed frames 2 and 3 each having an L-shaped cross section, and an upper support insulator 4 is attached to each phase on the upwardly slanted surface of the mountain-shaped portion. Five bolts are attached at the base end, and lower support insulators 6 for each phase are arranged on the downwardly inclined surface of the mountain-shaped portion so as to form a V-shape with respect to each of the upper support insulators 4. is attached at the base end with seven bolts.

An arc extinguishing chamber 14 is fixedly installed at the tip of the upper support insulator 4, and a fixed insertion electrode 15 is fixedly installed inside the arc extinguishing chamber 14. A power supply side terminal 11 led out upward from the chamber 14 is connected.

As shown in FIG. 1, a vertically extending fuse support 20 is integrally formed at the tip of the lower support insulator 6 in an oblique shape so that its lower end is inclined toward the support insulator 6 from its upper end. . Upper and lower fuse clamps 21 and 22 are tightened and fixed to the upper and lower ends of the fuse support 20 by screws 23 inserted from the back side of the fuse support 20, and both fuse clamps 21 and 22 A fuse support 20 is provided in the fitting holes 21a and 22a at the base end.
Fitting protrusions 19 as locking protrusions protruding from each end are fitted.

Furthermore, a pair of locking protrusions 20a are raised at the upper and lower ends of the fuse support base 20, and are engaged with the base end inner parts of the upper and lower fuse clamps 21 and 22, respectively. Therefore, the upper fuse clamp 21 and the lower fuse clamp 22 are engaged with the fitting protrusion 19 and the locking protrusion 20a, respectively, and are positioned so as to be unrotatable.

In addition, a fitting protrusion 19 and a screw 2 are provided between each fuse clamping fitting 21, 22 and the fuse support base 20.
The auxiliary metal fitting 24 inserted through the fuse clamping metal fittings 21,
22, and is urged inward by its own elastic force.

As shown in FIG. 2, a protrusion 20b is provided on one side of the fuse support base 20 from the center to the upper end.
A lower end portion of a movable contact blade 25, which corresponds to the protrusion portion 20b so as to be able to approach and separate from the fixed insertion electrode 15, is rotatably supported by a shaft 26. The movable contact blade 25 can be opened and closed by an external operation via an opening and closing mechanism. An upper end portion of a conductive plate 27, which also constitutes a terminal plate, is superimposed on the upper surface of the base end of the upper fuse clamp 21, and the screw 23
It is screwed on by. A connecting portion 28 is bent and extended from one side of the lower end of the conductive plate 27 to a position where it is inserted into the shaft 26, and is fixed between the lower end of the movable contact blade 25 and the protrusion 20b, thereby connecting the movable contact blade 25 and the electrical connection. connected. A fuse stopper 29 is formed on the upper edge of the conductive plate 27 and is bent in an L shape at right angles to the fuse support base 20 and serves as a fuse ring locking portion.

On the upper surface of the base end of the lower fuse clamp 22, the base end of a load-side connection terminal 30 as a terminal plate whose outer end is bent forward in a dogleg shape and led out downward is overlapped and screwed with the screw 23. At the same time, a hole through which the fitting protrusion 19 is inserted is provided. Further, the upper end edge of the load-side connection terminal 30 abuts against the locking protrusion 20a and is positioned so as to be rotatable.

A fuse stopper 32 serving as an inverted L-shaped fuse link locking portion is punched out at a position near the outer end of the load side connection terminal 30 from the bent portion so as to protrude forward, that is, in the direction of locking the fuse link. upper and lower fuse clamps 21 and 2 are formed and cooperate with the fuse stopper 29.
Both ends of a current-limiting fuse (not shown) that is clamped to the fuse support base 20 are locked so that the current-limiting fuse cannot be moved in the length direction on the fuse support base 20.
The fuse stoppers 29 and 32 constitute a fuse locking device.

A driven lever 33 is rotatably supported at the center of the upper end of the fuse support base 20, and a fusing display device (not shown) for a current-limiting fuse connected between the fuse clamps 21 and 22 protrudes. In response to the operation, the movable contact blades 25 of each phase are simultaneously opened via an open-phase prevention drive mechanism (not shown).

Note that 39 is an operation handle for external operation of the movable contact blade 25.

Fuse clamp 2 configured as above
The mounting structures 1 and 22 can be easily positioned by fitting the fitting protrusions 19 into the fitting holes 21a and 22a of the fuse clamps 21 and 22,
The upper and lower fuse clamps 21 and 22 can also be positioned by aligning their proximal inner sides with the locking protrusion 20a.

Further, after each of the fuse clamps 21 and 22 is attached to the fuse support base 20 with the screw 23, the upper fuse carrier 21 and the lower fuse clamp 22 are rotated relative to the fuse support base 20 by the fitting protrusion 19 and the locking protrusion 20a. is definitely prevented.

It should be noted that this invention is not limited to the above-mentioned embodiments, and may be modified as desired without departing from the spirit of this invention.

Effects As detailed above, in this invention, a fitting hole is provided in the fuse clamping fitting, a locking protrusion is provided in the fuse support base in a raised manner, and the locking protrusion is connected to the fitting hole. By engaging, the fuse clamping bracket is attached to the fuse support base, and the fuse clamping bracket and the fuse support base are screwed together, thereby producing the following unique effects.

(a) When attaching the fuse clamping bracket to the fuse support base, the fuse clamping bracket can be easily positioned and can be mounted in an accurate position.

(b) After the fuse clamping bracket is installed on the fuse support base, there is no risk that the fuse clamping bracket will rotate. Therefore, the mounting position of the fuse clamping bracket does not shift during or after the installation work of the fuse to the fuse clamping bracket, and the fuse can be reliably supported in a predetermined position.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a closed state of a switch according to an embodiment of this invention, and FIG. 2 is a front view thereof. Fitting protrusion (engaging protrusion)...19, fuse support stand...20, locking protrusion...20a, clamping bracket carrier...21, 22.

Claims (1)

[Claims for Utility Model Registration] A pair of upper and lower support insulators 4 and 6 are fixed to the mounting base 1, and a fixed interposed electrode 1 is attached to the tip of the upper support insulator 4.
An arc extinguishing chamber 14 containing a lower support insulator 6 is provided.
is provided with a fuse support stand 20 equipped with upper and lower fuse clamping fittings 21 and 22 at both ends for clamping both ends of the current-limiting fuse, and one end of the fuse support stand 20 is provided on the upper end side of the upper fuse clamping fitting 21. A conductive plate 27 to which is connected is arranged, and a load-side connection terminal 30 connected to the lower fuse clamping fitting 22 is fixed to the lower end side, and electricity is connected to the upper fuse clamping fitting 21 via the conductive plate 27. A movable contact blade 25 that is connected to the main body and driven to open and close by an open-phase prevention drive mechanism or the like is rotatably supported on the lower support insulator side of the fuse support base 20,
In the switch with a current-limiting fuse, in which the movable contact blade 25 is adapted to be able to approach and separate from the fixed clamping electrode 15, a fitting hole 21 is provided in the fuse clamping fittings 21 and 22.
a, 22a are provided transparently, and a locking protrusion 19 is provided in a raised manner on the fuse support base 20, and the locking protrusion 19 is engaged with the fitting holes 21a, 22a. 21,2
2 to the fuse support stand 20, and the fuse clamping fittings 21, 22 and the fuse support stand 2.
A mounting structure for a fuse clamping fitting in a switch with a current-limiting fuse, characterized in that 0 is screwed.