JPH11297554A - Current detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a current detecting device with a jacket case wherein missing of a lid part is prevented, the lid part is closed with a hooking part with no play for uniform pressurizing housed parts, and the lid part is allowed to be opened/closed with a single hand. SOLUTION: A lid part 2 is borne, biased on one end part with a pair of a supporting shaft 12a and a bearing part 21a, integrally with a case main body 1, and on one end part side of the lid part 2, a first engagement part is provided in which a protruding piece 22a is inserted in an engagement hole 13a with a tip end side protruding outside the case main body 1 for engagement, while the engagement is released by pushing operation with the protruding piece 11a, and on the opposite side, a second engagement part is provided wherein an extending piece 23a is engaged with a projection 14 in an engagement hole 23b, and the engagement is released by a pushing operation of the projection 14 synchronous with the protruding piece 22a of the first engagement part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detecting device for detecting a current flowing through a current line to be detected, and more particularly, to a current detecting device comprising an I-shaped core forming an annular magnetic path and a component body having a U-shaped core. The present invention relates to an improvement of an exterior case for accommodating a current detecting device.

[0002]

2. Description of the Related Art As shown in FIG. 14, a current detecting device includes UI cores 40, 41 forming a closed magnetic circuit and bobbins 42a, 4a.
2b, the coils 43a and 43b are wound around the bobbin shafts of the bobbins 42a and 42b, and a circuit board 45 on which necessary components such as a sensitivity switch 44 are mounted is mounted on the bobbins 42a and 42b. The component body side is configured, the component body side is assembled inside the case body 50, the connector 46 is pulled out, the I-type core 40 is assembled inside the cover 60, and the detected current line W is connected to the UI type core 40, The lid 60 is inserted into the inside of the annular magnetic path formed by 41 and is hooked to the case main body 50 to be closed so as to be mounted on the axis of the detected current line W.

Conventionally, as an outer case of the current detecting device, as shown in FIGS. 15 and 16, a quadrangular case main body 50 whose upper side is opened, and a case which is fitted inside an open end of the case main body 50 so as to fit inside. A lid 60 covering the open end of the main body 50 is provided, and a locking portion formed by fitting the projections 51 and 52 with the locking holes 61 and 62 is used as the case main body 50 and the lid 6.
The cover 60 is provided between the two end portions of the case 50 to close and close the lid portion 60 to the case body 50.

The engaging portion has slits 53a, 53b (hereinafter, only one side is denoted by a reference numeral) located on both sides of the projections 51, 52 from the open end of the case body 50 to the end wall 5.
An elastically deflectable tongue piece 51a provided on the wall surface of Oa and having projections 51 and 52 on the distal end side is provided. An operation piece 51b is provided on the middle abdomen of the tongue piece 51a to elastically deflect the tongue piece 51a. Thus, the projections 51 and 52 can be released from engagement. The locking holes 61 and 62 are provided on the plate surface of the projecting piece 63 extending from the end wall 60a of the lid 60 so that the lower surfaces of the protruding ends of the projections 51 and 52 are engaged with the hole edges.

The current detecting device is a relatively small component,
As shown in FIG. 15, since the lid 60 is completely removed from the case body 50 in the open state, a situation in which the lid 60 slips into another and is lost easily occurs. Further, since the opening / closing operation of the lid cannot be performed by one hand in the above-described latching portion, the workability at the time of maintenance, inspection, repair, or the like of the housing component is also affected.

If the lid is simply provided integrally with the case body, the lid may be pivotally connected to the case body by a hinge. However, according to the hinge, since the mechanism inevitably has a play, the lid portion floats in the closed state, and the I-type core and the U-type core are pressed evenly from the place where the housing parts are rattled. It is not suitable for constructing a high current detection device.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an I-shaped core is provided in which a lid is integrally attached to a case main body with a support shaft to prevent the lid from being lost. And U
It is another object of the present invention to provide a current detecting device which can be configured with high accuracy capable of pressing the mold core without bias, and in which the lid is assembled and housed in an outer case that can be opened and closed with one hand.

It is another object of the present invention to provide a current detecting device which can open and close a cover part, and can easily accommodate a housing component in and out of an outer case.

In addition, an object of the present invention is to provide a current detecting device in which the lid can be securely closed by a hook portion and the lid is housed in an outer case that can be easily opened and closed with one hand. I do.

[0010]

According to a first aspect of the present invention, there is provided a current detecting device, comprising: a pair of support shafts protruding in a line inward from a side wall near an open end of a case body; The side wall of the lid facing the side wall of the case body extends vertically from the upper side and the arc-shaped bearing part that curves outward from the middle abdomen to the lower side. A projecting piece projecting from the side wall of the lid and projecting outward from the inside of the case main body at the same end side below the pivoting position of the lid and supporting the body integrally with the main body; The projection is fitted into the engagement hole of the end wall from the inside of the case main body, and the distal end protrudes and engages with the outside of the case main body. On the other hand, a first latch portion is provided which can be disengaged by a push operation of the projection, and a case book is provided on the opposite side of the first latch portion. A projection protruding outward from the wall surface of the end wall near the open end of the end portion, and a locking hole provided on the plate surface of the overhanging piece extending from the end wall of the lid portion. An outer case provided with a second latching portion which engages with the projection of the case main body at the locking hole and can be disengaged by a push operation of the projection synchronized with the projection of the first latching portion. It is constructed by assembling.

In the current detecting device according to a second aspect of the present invention, the upper side of the protruding piece is formed as an upwardly sloping side toward the outside of the case body, and the engagement is released by pushing the protruding piece. In addition, the lid is assembled by an outer case provided with a first latching portion that can be flipped up and rotated on the upper side of the projecting piece.

In the current detecting device according to a third aspect of the present invention, slits located on both sides of the projection are provided on the wall surface of the end wall from the open end of the case main body, and the projection is provided on the front end side. It is constructed by assembling with an outer case provided with a second tongue which is provided with a tongue which can be displaced and a projection which can be disengaged by pushing the tongue.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, the illustrated embodiment constitutes the same current detecting device as shown in FIG. 14, and the current detecting device is shown in FIGS.
As shown in the figure, the entire case is assembled using a small match box type outer case having a relatively narrow width and a vertical rectangle. This outer case is 34mm long and 22m wide.
m, which is made of plastic having a thickness of about 12 mm and has a rectangular cylindrical case body 1 whose upper side is open, and a lid 2 that covers the open end of the case body 1.
It is assembled from a bottom plate 3 fitted and fixed to the bottom side of the case body 1.

In the case body 1, the component body excluding the I-shaped core is accommodated by being surrounded by a shield plate (not shown) made of a thin metal plate. As shown in FIG. 1 and FIG. 2, a metal plate having a lower end obliquely projecting inside the case body 1 and an upper end embedded in the side walls 10 a and 10 b of the case body 1 is mounted on a side surface of the shield plate. Thin spring pieces 4a, 4b, 4c, 4
The shield plate is fixed to the case body 1 by the spring pieces 4a, 4b, 4c, and 4d.

As shown in FIGS. 1 and 2, the lid 2 is
0a, 20b and end walls 20c, 20d are combined so as to be located inside the open end of the case body 1. Further, the bottom plate 3 has hook-shaped hooking claws 30a, 30b (shown from the back side in FIG. 1) 31a, 31b at the relative edges rising upward, and the hooking hooks 3a, 30b are provided.
The case body 1 is engaged by engaging the holes 0a, 30b, 31a, 31b with receiving holes 11a, 11b (hidden in FIG. 1 by hooking claws) provided in the side walls 10a, 10b of the case body 1. It is fitted and fixed to the bottom side of.

In the outer case, as shown in FIGS. 2 and 3, opposed side walls 10a, 10a of the case body 1 are provided.
b, a pair of support shafts 12a protruding from each inner surface on the same line.
12b is provided near the open end near one end. Further, bearing portions 21a and 21b for receiving the pair of support shafts 12a and 12b are provided on the side wall 10 of the case main body 1.
a, 10b are provided on the wall surfaces of the side walls 20a, 20b facing each other. The spindles 12a, 12 of the case body 1
The cover 2 is slidably fitted to the bearings 21a and 21b of the cover 20, so that the cover 2 is supported integrally with the case body 1.

As will be described later, the bearing portions 21a and 21b are linearly continuous in a vertical direction from the upper side of the lid 2 to the middle abdomen so that the lid 2 can be largely opened, and the lower side from the middle abdomen is provided. It is provided on the wall surfaces of the side walls 20a and 20b so as to be curved outward in an arc shape. The bearings 21a and 21b can be formed by openings or grooves.

At the same end, lower than the pivotal support position of the lid 2, a first latching portion projects from each side edge of the side walls 20a, 20b as shown in FIG. Protruding pieces 22a, 2
2b, and vertically long locking holes 13a, 13b located on the wall surface of the end wall 10c of the case body 1. In this first latching section, as shown in FIG.
2a (only one side is shown) is formed with an upwardly inclined side 22c near the top end.

The first latching part is a projection 22 of the lid 2.
a, 22b are fitted into the locking holes 13a, 13b of the end wall 10a from the inside of the case main body 1, and the protruding ends protruding outside the case main body 1 are connected to the upper edges of the locking holes 13a, 13b. It is configured to engage. In addition, the first latching portion can be disengaged by pushing the protruding pieces 22a and 22b, and the lid 2 can be disengaged from the protruding pieces 22a and 22b.
Is configured to be able to jump up and rotate on the inclined side 22c.

The end wall 1 provided with the first latching portion
On the end walls 10d and 20d on the opposite side to 0c and 20c, a second latching portion is provided as shown in FIG. The second latching portion includes a protrusion 14 protruding outward from a wall surface of the end wall 10 d near the open end of the case body 1 and a plate surface of an overhanging piece 23 a extending from the end wall 20 d of the lid 2. And a locking hole 23b which is open to the outside. In the second latching portion, dimensions are set such that the lower surface of the protruding end of the projection 14 is engaged with the edge of the locking hole 23b.

In the second engaging portion, the slits 15a and 15b located on both sides of the projection 14 are separated from the case body 1.
An elastically deflectable tongue piece 14a having a projection 14 on the distal end side by being provided on the wall surface of the end wall 10d from the open end is provided. The operation piece 14b is attached to the tongue piece 14a.
Is provided on the middle abdomen so that the tongue piece 14a is elastically displaced and the projection 14 can be disengaged.

In the thus constructed outer case, the lid 2 can be closed by holding the case body 1 with the thumb and the middle finger and pressing the lid 2 with the forefinger around the support shafts 12a and 12b. . In the closed state of the lid 2,
As shown in FIG. 5 and FIG. 6, the first latch portion is
22b from the inside of the case body 1 to the locking hole 13
a, 13b, and the inclined side 22c, which protrudes outward from the case body 1 and has an upward slope on the distal end side, is brought into contact with the upper edges of the locking holes 13a, 13b to be securely engaged. On the other hand, since the second latching portion engages with the lower surface of the protruding end of the projection 14 and the hole edge of the locking hole 23b, the lid 2 has no play to escape upward, and the I-shaped core is tightly attached to the U-shaped core. By contact, the I-shaped core and the component body side can be reliably pressed and housed without bias.

To open the lid 2, the case body 1 is grasped with the middle finger or the ring finger, and the protruding piece 22a and the operation piece 14b of the tongue piece 14a are grasped with the thumb and forefinger of one hand and pushed synchronously from both sides. If operated, as shown in FIGS.
The engagement between the projecting piece 22a of the latching portion and the locking hole 13a can be released, and the projection 14 of the second latching portion can be elastically displaced to easily disengage from the locking hole 23b. it can. In addition, since the upper end of the protruding piece 22a exerts a leverage action on the inclined side 22c having an upward slope, the second hooking portion side of the lid 2 can be flipped up and rotated.

After disengagement of the engaging portion, FIGS.
As shown by, the lid 2 is supported by a bearing 21
By sliding along the edge shape of “a”, the case body 1 is displaced near one end, and the side wall 20 of the lid 2 is moved.
a, 20b can be wide open so as to escape laterally from the open end of the case body 1.

The open position of the lid 20 is the bearing 21a.
Is curved in an arc shape and reaches the tip end side of the protruding piece 22a, so that it can be opened extremely widely. Thereby, the I-shaped core and the component body of the current detecting device can be easily put in and out of the case body 1 and the lid 2. In addition, as described above, the lid 2 can be opened and closed with one hand, and the workability of maintenance, inspection, repair, and the like of the housed components can be improved.

The cover 2 of the outer case is provided with a pressing means so that the I-shaped core can be assembled and fixed more stably and reliably. As the pressing means, as shown in FIG. 1, a pair of pressing claws 2 inclined obliquely downward in opposite directions.
4a and 24b are provided on the top surface 20e by framing with slits except for the base portion. In addition, as shown in FIG. 13, the retaining bars 25a, 25b project inward from the ends of the side walls 20a, 20b so as to sandwich the I-shaped core between the holding claws 24a, 24b from above and below. Is provided. Also, the ridges 26a, 26b, 26c, 26d that are continuous in the vertical direction of the side walls 20a, 20b and the ridges 27a, 27 that are continuous in the vertical direction of the end walls 20c, 20d.
b are provided on each inner surface to position the I-shaped core from the periphery.

In this current detecting device, the detected current line W is inserted between the I-shaped core and the U-shaped core 41 so that the detected current line W
As shown in FIGS. 1 to 3, the cutout holes 17a, 17b, 28a, 28b through which the current to be detected are inserted are aligned in the case main body 1 and the lid 2 as shown in FIGS. Side walls 10a, 10b, 2
0a, 20b. The side walls 10a and 10b of the case main body 1 are provided with insertion holes 18a and 18b for a driver or the like for adjusting a sensitivity switch. In the above-described embodiment, the description has been given based on the plastic outer case, but this may be formed from a metal material.

[0028]

As described above, according to the current detecting device of the first aspect of the present invention, the lid is supported integrally with the case body by a pair of support shafts near one end. Since it does not come off even in the open state, it is possible to prevent the lid from being lost. In addition, in order to provide an arc-shaped bearing portion that extends vertically from the upper side of the side wall of the lid portion and curves outward from the middle abdominal side to the lower side, the lid portion is formed with the support shaft as a fulcrum, and the edge shape of the bearing portion is provided. By sliding along, the position is shifted to one end of the case main body, and the side wall of the lid is widely opened so as to escape laterally from the open end of the case main body, so that the I-shaped core and the component main body can be easily taken in and out. it can.

In addition, a first latching portion in which the tip side of the protruding piece fits into and engages with the locking hole of the end wall from the inside of the case body, and the protruding piece engages with the projection at the locking hole. By providing the second latching portion, there is no play in which the lid escapes upward, so that the stored articles can be pressed and stored without bias. Further, when the protruding piece of the first latch is pushed, the first latch can be disengaged.
Since the second latching portion can also be disengaged, the lid can be opened and closed with one hand, and the operability of maintenance, inspection, repair, and the like of the housing component can be improved.

According to the article storage case according to the second aspect of the present invention, when the distal end side of the protruding piece of the first latching portion is pushed, a lever action is exerted on the upper side of the protruding piece exhibiting an upward slope. Accordingly, the lid can be flipped up and rotated upward, and the lid can be more easily opened.

According to the current detecting device of the third aspect of the present invention, the slits located on both sides of the projection are provided on the wall surface of the end wall from the open end of the case body, and the projection is provided on the front end side. By assembling with an outer case provided with a tongue that can be elastically displaced, and a second hook that can disengage the projection by pushing the tongue, it can be synchronized with the first hook. The second latch can also be easily disengaged.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an outer case for assembling a current detection device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the outer case of FIG. 1;

FIG. 3 is a perspective view showing the exterior case of FIG. 1 from a different angle from FIG. 2;

FIG. 4 is a side sectional view showing a lid of the exterior case of FIG. 1;

FIG. 5 is a side sectional view showing the exterior case of FIG. 1 in a state where a lid is closed.

FIG. 6 is a perspective view partially showing the exterior case of FIG. 5 from an upper side of a lid.

FIG. 7 is a side sectional view showing the outer case of FIG. 1 at an initial stage of opening a lid portion.

FIG. 8 is a perspective view partially showing the exterior case of FIG. 7 from the upper side of a lid.

FIG. 9 is a side sectional view of the outer case shown in FIG. 1 with a lid part opened sideways.

FIG. 10 is a side sectional view showing the outer case of FIG. 1 in which the lid is further opened laterally than in FIG. 9;

FIG. 11 is a perspective view partially showing the exterior case of FIG. 10 from an upper side of a lid.

FIG. 12 is a side sectional view showing the outer case of FIG.

FIG. 13 is a cross-sectional view showing the cover of the outer case shown in FIG. 1 along the line AA in FIG. 4;

FIG. 14 is an explanatory diagram illustrating an example of a current detection device that can be configured according to the present invention.

FIG. 15 is an exploded perspective view showing an outer case of a current detection device according to a conventional example.

FIG. 16 is a perspective view showing the exterior case of FIG. 15 with a lid closed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main body 10a, 10b Side wall of case main body 10c, 10d End wall of case main body 2 Lid 20a, 20b Side wall of lid 20c, 20d End wall of lid 12a, 12b Support shaft 21a, 21b Bearing portions 13a, 13b Locking holes 22a, 22b of first locking portion 22c, projection of first locking portion 22c Upper side of projection 14 Projection of second locking portion 14a Tongue of projection 15a, 15b Slit 23a Overhanging piece of second latching part 23b Engagement hole of overhanging piece

Claims (3)

[Claims] 1. A component body having a U-shaped core is assembled inside an open end of a case body, and the U-shaped core and an I-shaped core forming an annular magnetic path are assembled inside a lid, and each part is formed into an outer case. The current line to be detected is inserted into the annular magnetic path formed by the UI type core through a notch hole provided so as to be aligned with the opposite side wall of the case body and the lid, and the lid is The current detection device is mounted on the axis of the current line to be detected by closing the main body with a hook portion provided between the main body and the case main body. A pair of support shafts projecting in a line, and a side wall of the lid facing the side wall of the case body, extending in the vertical direction from the upper side and arcuately bending the lower side outward from the middle abdomen. The lid is pivoted integrally with the case body from the bearing toward one end. On the same end side below the pivotal support position of the lid, a protruding piece protruding from the side wall of the lid and extending outward from the inside of the case body, and a wall of the end wall of the case body The protruding piece is fitted into the locking hole of the end wall from the inside of the case main body, and the front end side protrudes and engages with the outside of the case main body. First that can be disengaged by push operation
A projection protruding outward from the wall of the end wall near the open end of the case body and a projecting piece extending from the end wall of the lid on the opposite side of the first latching portion. A locking hole provided in the plate surface, and the projection of the lid is engaged with the projection of the case body by the locking hole, while the projection of the projection is synchronized with the projection of the first latching portion. A current detection device comprising: an outer case provided with a second latch portion that can be disengaged by a push operation. 2. An upper side of the protruding piece is formed as an upwardly sloping side toward the outside of the case main body, and disengagement is performed by pushing the protruding piece, and a lid portion is connected to the upper side of the protruding piece. The current detection device according to claim 1, wherein the current detection device is assembled with an outer case provided with a first latch portion that can be flipped up and rotated. 3. A resiliently deflectable tongue, which is provided on the wall of the end wall from the open end of the case main body with the protrusion being located on both sides of the case body, and the protrusion is provided on the front end side, wherein the tongue is provided. The current detection device according to claim 1 or 2, wherein the current detection device is assembled with an outer case provided with a second latching portion capable of disengaging the projection by the push operation.