JP2009014366A - Clamp type ammeter - Google Patents

Abstract

Provided is a clamp-type ammeter that can effectively prevent mutual opening of butt ends even when twisted.
One side sensor unit comprising a butt end portion and abutting abutting when the current sensors are separately housed in one side holder unit and the other side holder unit, and being closed. In the clamp type ammeter 11 in which the sensor unit 23 and the other side sensor unit 23 are attached to the meter body 12, the open end portion 16 a of the one side holder 16 is provided with a recessed portion 17 having an open front end surface, and the other side holder 26. The open end 26a is provided with a protrusion 27 that is positioned in the recess 17 when closed, and the recess 18 is provided on the inner surface 17a of the recess 17 and the outer surface of the protrusion 27 facing the recess 18 is provided. 27a is provided with a convex portion 28 so as to be freely engaged when receiving an external force in the twisting direction at the time of closing.
[Selection] Figure 1

Description

  The present invention provides a clamp-type ammeter that can be accurately measured by making it difficult to open the butt ends even when a force in the torsional direction is applied in the closed state at the time of measurement. Technology.

  Clamp-type ammeters are used to clamp and measure conductors to be measured such as live wires. From the viewpoint of stable measurement, the clamped ammeter is always in a position where the butt ends are always facing each other. It is necessary to contact and close with.

The following Patent Document 1 discloses an example of a butt end structure that is employed to maintain a direct positional relationship from the above request.
Japanese Patent Laid-Open No. 11-295347

  According to the cited document 1, each butted end portion is closed when the one side holder side projection is the other side holder recess, and the one side holder side recess is the other holder side projection. By fitting them together, the contact surfaces of the current sensors can be brought into direct contact with each other and reliably contacted.

  However, according to the disclosed technique of Patent Document 1, when the measurement is performed with the clamp sensor side in a complicated place, it becomes difficult to see the display unit that displays the measurement value. I will try to see it.

  When twisting the clamp sensor in this way, there is a problem in that the butt end portions that are closed in the normal state are pry open and accurate measurement cannot be performed.

  The present invention has been made in view of the above-described problems of the prior art, and even when twisted during measurement, a clamp-type current that can effectively prevent the butt end portions from being opened apart. The purpose is to provide a total.

  The present invention has been made to achieve the above object, and stores current sensors separately in one side holder part and the other side holder part which are arranged to face each other in a substantially annular shape, and at the time of closing the current sensor In a clamp-type ammeter in which a one-side sensor unit and a second-side sensor unit each having a butting end portion that abuts each other are attached to the meter body so as to be freely opened and closed, the butting end portion on the one-side sensor unit side is located The open end of the one side holder is provided with a recessed portion with an open front end surface, and the open end of the other side holder where the butting end on the other side sensor unit side is located Protruding portions are provided in the recessed portions, and a concave portion is provided on the inner side surface of the concave portion, and a convex portion is provided on the outer side surface of the protruding portion facing the concave portion to receive external force in the torsional direction at the time of closing. The most important feature is that the engagement is free. That.

  In this case, the concave portion is provided in at least one place on the two opposing surfaces on the inner side surface of the concave portion, and the convex portion is provided in at least one place on the outer surface of the protruding portion facing the concave portion separately. It is preferable to leave.

  According to the present invention, a concave portion is provided on the inner side surface of the recessed portion provided at the open end portion of the one side holder, and a convex portion is provided on the outer side surface of the protruding portion provided at the open end portion of the other side holder. When receiving external force in the torsional direction sometimes, the concave and convex portions are latched to make it difficult to open the butt end of the one side sensor unit and the butt end of the other side sensor unit. Measurements can be made.

  FIG. 1 is an explanatory diagram showing an example of the present invention, in which (a) is a front view, (b) is a cross-sectional view in the direction of arrows AA in (a), and (c) is a cross-sectional view. The enlarged view of the cross-sectional site | part in (b) is each shown. Moreover, FIG. 2 is explanatory drawing which shows an example of the one side holder located in the left side, (a) of them shows a whole perspective view, (b) shows the principal part enlarged view, respectively. Furthermore, FIG. 3 is explanatory drawing which shows an example of the other side holder located in the right side, (a) of them shows a whole perspective view, (b) shows the principal part enlarged view, respectively.

  According to these figures, the clamp-type ammeter 11 accommodates the current sensors 15 and 25 separately in the one-side holder portion 16 and the other-side holder portion 26 that are opposed to each other in a substantially annular shape, and The whole is formed by attaching the one side sensor part 13 and the other side sensor part 23 provided with the abutting end parts 14 and 24 that abut each other at the time of closing to the instrument body 12 so as to be freely opened and closed.

  Among these, the open end portion 16a of the one side holder 16 where the butting end portion 14 on the one side sensor portion 13 side is located is provided with a recessed portion 17 having an open front end surface. Further, the open end 26a of the other holder 26 where the butting end 24 on the other sensor 23 side is located is provided with a protrusion 27 that is positioned in the recessed portion 17 when the other end 26a is closed.

  And the recessed part 18 is provided in each two opposing surfaces in the front-back direction in the inner surface 17a of the recessed part 17 of the one side holder 16. As shown in FIG.

  In addition, convex portions 28 are provided at two locations on the open edge side of the outer surface 27a of the protruding portion 27 of the other side holder 26 that faces the individual concave portions 18 at the time of closing, and in the torsional direction at the time of closing. Engagement with the concave portions 18 facing each other when receiving external force is possible.

  In this case, the concave portion 18 of the one-side holder 16 and the convex portion 28 of the other-side holder 26 are not engaged with each other when the one-side holder 16 and the other-side holder 26 are closed facing each other. It is formed under an arrangement relationship that engages only when an external force is applied in the twisting direction.

  Next, the operation and effect of the present invention having the above-described configuration will be described. The clamp of the measured line in the live line state using the clamp type ammeter 11 includes the lever 19 and the other side holder provided in the one side holder portion. After pushing the lever 29 provided in the section 23 to open the butt end portions 14 and 24 side and introducing the line to be measured, the butt end portions 14 and 24 side are closed by releasing the pressing force on the levers 19 and 29. Is done.

  At this time, the projecting portion 27 of the other side holder 26 can be loosely fed into the recessed portion 17 of the one side holder 16 with the convex portion 28 not contacting the inner side surface 17a. Can be performed smoothly.

  After clamping the measurement line in the live line state in this way, measurement using the clamp-type ammeter 11 is performed, and the measurement value can be confirmed by viewing the display unit 31.

  Further, when performing measurement using the clamp-type ammeter 11 in a complicated place, after clamping the line to be measured in a live line state, the display unit 31 is twisted to a position where it can be visually observed to the display unit 31. It is necessary to visually check the displayed measurement values.

In this way, when a force in the twisting direction is applied to the one side holder 16 side and the other side holder 26 side while clamping the measurement line in the live line state, the opening direction is applied to the butted end portions 14 and 24 in the closed state. The force is applied to one side and tries to be biased to one side.
The

  However, since the recess 18 is formed on the inner surface 17a of the recess 17 of the one side holder 16 and the projection 28 is formed on the protrusion 27 of the other side holder 26, it is in a closed state. The concave portion 18 and the convex portion 28 are engaged with each other when a force in the prying direction is applied to the butt end portions 14 and 24.

  As a result, the butt end portions 14 and 24 can be kept closed without being pry open, so that accurate and stable measurement can be performed.

  The above is the description of the present invention based on the illustrated examples, and various modifications can be made to the specific contents without departing from the gist of the present invention. For example, in the illustrated example, the concave portion 18 of the one side holder portion 16 is formed on the back end side of the inner side surface 17 a of the concave portion 17, and the convex portion 28 of the other side holder 26 is on the open edge side of the outer side surface 27 a of the protruding portion 27. However, as long as they are in a positional relationship corresponding to each other, for example, the concave portion 18 can be formed on the inner surface 17a slightly closer to the opening, and the convex portion 28 can be formed on the corresponding position on the outer surface 27a. Moreover, the recessed part 18 of the one side holder part 16 and the convex part 28 of the other side holder 26 can also be provided in each of several places, as long as it has a corresponding positional relationship.

It is explanatory drawing which shows an example of this invention, (a) is a front view, (b) is sectional drawing in the AA arrow direction in (a), (c) is in (b). The enlarged view of a cross-sectional site | part is each shown. It is explanatory drawing which shows an example of the one side holder located in the left side, (a) of them shows the whole perspective view, (b) shows the principal part enlarged view, respectively. It is explanatory drawing which shows an example of the other side holder located in the right side, (a) of them shows a whole perspective view, (b) shows the principal part enlarged view, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Clamp-type ammeter 12 Instrument main body 13 One side sensor part 14 Butt end part 15 Current sensor 16 One side holder part 16a Open end part 17 Recessed part 17a Inner side surface 18 Recess part 19 Lever 23 Other side sensor part 24 Butt end part 25 Current Sensor 26 Other side holder part 26a Open end part 27 Projection part 27a Outer side face 28 Projection part 19 Lever 31 Display part

Claims (2)

A one-side sensor portion that has a substantially annular shape and stores a current sensor separately in a one-side holder portion and another-side holder portion that are arranged opposite to each other, and includes a butt end portion that contacts each other when the current sensor is closed; In the clamp-type ammeter with the other side sensor part attached to the instrument body so as to be freely opened and closed,
In the open end of the one side holder where the butt end on the one side sensor part side is located, a concave part with an open end surface is provided,
In the open end portion of the other side holder where the butting end portion on the other side sensor portion side is located, a protruding portion is provided that is positioned in the recessed portion when closed, and
A concave portion is provided on the inner side surface of the concave portion, and a convex portion is provided on the outer side surface of the projecting portion facing the concave portion, so that engagement when receiving an external force in a twisting direction at the time of closing can be freely performed. A clamp-type ammeter. The said recessed part is provided in each at least one place of the two opposing surfaces in the said inner surface of a recessed part, and the said convex part is provided in the said outer surface of the protrusion part which respectively faces the said recessed part at least one place. A clamp-type ammeter as described in 1.

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