JPH0351747Y2 - - Google Patents

Description

[Detailed description of the invention] This invention consists of laminating thin plates such as permalloy as a pair of curved magnetic cores to form a window hole for passing the wire under test, and overlapping each other at both upper and lower ends. This invention relates to a clamp-type ammeter configured such that the lower end portions are connected in an overlapping state, and the upper end portions can be opened on both sides.

In this type of clamp-type ammeter, if there is wobbling at the upper end of the pair of magnetic cores when they are opened or closed, the overlapping part cannot be smoothly overlapped, so the lower end of the pair of magnetic cores is It must be pivoted so that the parts can be opened and closed without rattling.

The present invention aims to provide a clamp-type ammeter that can meet the above needs.

The embodiment of the present invention will be explained below based on the ground. 1 and 1' are window holes 2 for passing the wire to be measured.
A pair of magnetic cores are curved to form a pair of magnetic cores, and thin permalloy plates are laminated together, and overlapping parts 3, 3', 4,
4', and coil winding parts 5, 5' with narrowed plate widths are provided in the middle. 6, 6' are magnetic cores 1,
Holes 8 and 8' are screws inserted from one side to the opposite side of the upper and lower parts of the magnetic cores 1 and 1'. Screw the nuts 9, 9' into the ends of the bolts to attach the magnetic cores 1,
The laminated plates forming 1' are fastened together.
10 and 10' are protrusions that are integrally provided from the lower part of the magnetic cores 1 and 1', and one of the protrusions has a
An opening/closing lever is attached, and a spring is suspended on the opening/closing lever for biasing the upper ends of the magnetic cores 1, 1' to a position where they are always overlapped. Reference numeral 11 denotes a hinge that connects the overlapping parts 4, 4' at the lower ends of the magnetic cores 1, 1' in an overlapping state;
Shaft joints 13, 13' are provided on a pair of hinge pieces 12, 12' which have a shape that fits from the lower surface to both side surfaces of each lower end, that is, a U-shaped bent shape as shown in the third figure. , this shaft coupling 13,1
3' through which the shaft pin 19 is passed. 14, 14' are through holes drilled in parts 15, 15' of the hinge pieces 12, 12' that fit on both sides of the lower end of the magnetic cores 1, 1', and communicate with the through holes 6, 6'. do. 16, 16' are through holes drilled in the parts 17, 17' of the hinge pieces 12, 12' that fit into the lower surfaces of the magnetic cores 1, 1'.
The lead wires connected to the coils wound around the magnetic cores 1 and 1' are passed through. Reference numerals 18 and 18' denote shaft pins inserted through the through holes 14 and 6, and through the through holes 14' and 6', respectively, to connect the hinge 11 to the magnetic core 1,
It is hinged at 1'.

The magnetic cores 1 and 1' in the above embodiments may be installed so as to be able to be opened in both directions inside the case of the ammeter main body, which can be carried with one hand, for example.
As shown in the figure, the lower end overlapping parts of a pair of large and laminated magnetic cores 1 and 1' are overlapped and connected by a hinge 11 similar to the hinge 11 shown in the above embodiment, so that it can be opened and closed with both hands. The magnetic cores 1 and 1' are built into the connected large case, and a pair of hinge pieces 12 and 12' forming the hinge 11 are fitted into a hinge piece fitting part provided inside the case. The upper overlapping portions of the magnetic cores 1 and 1' may be supported so as to be openable and closable by being fixed integrally with the case.

As described above, the present invention connects a pair of laminated magnetic cores supported so as to be able to open in both directions with a hinge with their lower ends overlapping, and connects the hinge from the lower end of the pair of magnetic cores. Since both sides are molded into a shape that fits each other, it not only significantly increases the connection strength compared to a method that only connects the bottom surfaces of the lower ends of a pair of magnetic cores, but also allows the pair of magnetic cores to be held together stably. It is possible to eliminate rattling in the lateral direction when opening and closing the upper end portions of the thin plates, and to smoothly overlap the upper end overlapping portions formed so that the tips of the thin plates protrude every other sheet. Furthermore, the pair of magnetic cores can be stably hinged without increasing the width of the lower end, which saves on magnetic core material, making it ideal when using magnetic cores made of expensive materials such as permalloy. be.

[Brief explanation of the drawing]

Figure 1 is a front view of the overlapping parts of the upper and lower ends of a pair of magnetic cores, Figure 2 is a front view of the hinge, Figure 3 is a top view of Figure 2, and Figure 4 is Figure 2. 5 is a plan view showing a state in which the overlapping parts at the upper ends are overlapped with each other, FIG. 6 is a front view showing the open state of a pair of magnetic cores connected by a hinge, and FIG.
The figure shows a modified embodiment of the present invention. 1, 1'...Pair of magnetic cores, 2...Window hole, 3,
3'...overlapping part at upper end, 4,4'...overlapping part at lower end, 6,6'...through hole, 11...hinge, 12,
12'...Hinge piece, 13,13'...Shaft joint, 1
4, 14'...through hole, 15, 15'...portion that fits on both sides of the lower end of the magnetic cores 1, 1', 16,
16'...The part that fits into the lower surface of the magnetic core, 1
8, 18'...Axis pin, 19...Axis pin.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of magnetic cores curved to form a window hole through which the wire to be measured is passed, made of laminated thin plates such as permalloy, and overlapped with each other at both upper and lower ends. When the lower ends of the pair of magnetic cores are overlapped, a shaft is attached to a pair of hinge pieces shaped to fit from the lower side to both sides of each lower end. A joint is provided, and a shaft pin is passed through each of the joints. Of the hinge pieces, the shaft pin is inserted through the portion that fits on both sides of the lower ends of the pair of magnetic cores and the lower end of the pair of magnetic cores. A clamp-type ammeter consisting of a pair of magnetic cores supported by their upper overlapping portions so that they can be opened both ways. (2) The clamp-type ammeter according to claim 1, wherein a pair of hinge pieces are fixed inside a case that covers a pair of magnetic cores and is connected so that they can be opened both ways.