JP2019207115A - Clamp sensor and measurement device - Google Patents

Abstract

To enable reliable and easy confirmation as to whether or not respective ends of both clamp arms are in contact with each other.SOLUTION: A clamp sensor comprises: clamp arms 11,12 which constitute a sensor portion 10; a lever 13 which enables operation for rotating the arm 12 in a first rotational direction about a rotating shaft disposed on a base end of the arm 12 to perform transition to a first state where respective ends of the arms 11,12 are spaced apart and operation for rotating the arm 12 in a second rotational direction to perform transition to a second state where the respective ends of the arms 11,12 are in contact with each other; and a casing 15 which is provided with an opening 15a for causing an operation portion 13a of the lever 13 to protrude therethrough and is configured to be able to house a base end of the lever 13 and the base end of the arm 12. The lever 13 is provided with an open/close state distinction mark M1 set to be at a site which is visible in the second state and is non-visible when the arm 12 is rotated in the first rotational direction from a position in the second state.SELECTED DRAWING: Figure 2

Description

  The present invention includes a clamp sensor configured such that at least one of a pair of clamp arms is rotated by operation of an operation lever so that the tip portions of both clamp arms can be brought into contact with and separated from each other, and such a clamp sensor is provided. It is related with the measuring device comprised.

  As a measuring device equipped with this type of clamp sensor, the applicant has a clamp meter that includes a clamp sensor and a main body (measuring device main body), and is configured to be able to measure the current flowing in the electric wire (clamp target) in a non-contact manner. It is disclosed in the following patent document. In this case, in the clamp meter disclosed by the applicant, a pair of sensor portions each formed in an arc shape (hereinafter referred to as “clamp sensor (annular sensor portion)” composed of “both sensor portions” in the same document) In order to make this distinction clear, the “sensor part” in the same document is also referred to as “clamp arm”) to form an annular clamp sensor. Further, in the clamp meter disclosed by the applicant, one of both clamp arms is pivotally supported by the main body so as to be rotatable with respect to the main body in accordance with an operation (pushing and releasing of pushing) on the lever. The other of the clamp arms is fixed to the main body without rotating.

  Thus, in the clamp meter disclosed by the applicant, the tip portions and the base ends of both clamp arms are in contact with each other, and the clamp sensor is in an annular shape (a state where both clamp arms are closed), When the levers are operated (push-in), the distal ends and the proximal ends of both clamp arms are separated from each other so that the clamp target can be positioned between the clamp arms (the center of the clamp sensor) (both It is possible to shift to a state in which the clamp arm is open. Further, in the clamp meter disclosed by the applicant, from the state where the distal ends and the proximal ends of both clamp arms are separated from each other (the state where both clamp arms are opened), the lever is operated (release of pushing). It is possible to shift to a state in which the distal end portions and the proximal end portions of both clamp arms are in contact with each other (a state in which both clamp arms are closed).

JP-A-2018-31608 (page 4-7, FIG. 1-6)

  However, the clamp meter disclosed by the applicant has the following problems to be improved. Specifically, in the clamp meter disclosed by the applicant, after both clamp arms are closed, both clamp arms are opened by lever operation and the object to be clamped is positioned between both clamp arms, and then by lever operation. A configuration is adopted in which an annular clamp sensor is positioned around the object to be clamped by closing both clamp arms.

  In this case, when measuring with this kind of clamp meter, the electric wire whose outer diameter is about the same as the inner diameter of the clamp sensor is clamped as a clamp target, or the clamp sensor is clamped with the clamp sensor being largely inclined with respect to the clamp target. May need to be done. When clamping in such a situation, the inner peripheral part of the clamp arm is in contact with the outer peripheral part to be clamped, and the two clamp arms are not completely closed (the tip parts and the base parts are slightly separated from each other). State), and accurate detection of the magnetic field (accurate measurement of current) may be difficult. For this reason, it is preferable to confirm whether or not the tip portions of both clamp arms are completely closed during a measurement operation using this type of clamp meter.

  However, in the clamp meter disclosed by the applicant, in order to facilitate the work of clamping the clamp object by the clamp sensor and the work of removing the clamp sensor from the clamp object, the tip portions of both clamp arms (by lever operation) Both clamp arms are arranged so that the end portion that is in contact with and separated from the tip portion of the clamp meter (clamp sensor). Therefore, in the clamp meter disclosed by the applicant, when both clamp arms are closed from the state where the clamp object is positioned between both clamp arms, the tip of both clamp arms is located behind the clamp object. It may become. For this reason, in the clamp meter disclosed by the applicant, it may be difficult to confirm whether or not both clamp arms are completely closed. Therefore, it is preferable to improve this point.

  The present invention has been made in view of such problems to be improved, and provides a clamp sensor and a measuring apparatus that can reliably and easily confirm whether or not the tip portions of both clamp arms are in contact with each other. The main purpose is to provide.

  In order to achieve the above object, a clamp sensor according to claim 1 is formed in an arc shape and has a pair of clamp arms constituting an annular sensor portion in a state where tip portions are in contact with each other, and at least of the pair of clamp arms. A first shaft in which the tip ends of the pair of clamp arms are separated from each other by rotating at least one of the pair of clamp arms in a first rotation direction around a rotation shaft disposed in the vicinity of the base end portion on one side. The tip of the pair of clamp arms by rotating the at least one in a second rotation direction opposite to the first rotation direction about the rotation axis An operation lever capable of shifting to the second state where the two are in contact with each other, an opening for projecting the operation portion of the operation lever, and a base end portion of the operation lever and the small amount of the operation lever are provided. A clamp sensor including a casing configured to be able to accommodate one of the proximal ends, wherein the operation lever includes a portion that is visible when the pair of clamp arms are in the second state. A first mark defined as a portion that becomes invisible when the at least one of the pair of clamp arms rotates in the first rotation direction from the position in the second state; The pair of clamp arms are invisible when the pair of clamp arms is in the second state, and the at least one of the pair of clamp arms is rotated in the first rotation direction from the position in the second state. At least one of the second marks defined in the part that is sometimes visible is provided with a state determination mark.

  The clamp sensor according to claim 2 is the clamp sensor according to claim 1, wherein the operation lever includes the casing from the opening when the pair of clamp arms in the operation portion is in the second state. The state protruding from the opening to the portion that moves into the casing when the at least one is rotated from the position in the second state in the first rotation direction. The first mark is defined as a discrimination mark.

  According to a third aspect of the present invention, there is provided the clamp sensor according to the first or second aspect, wherein the operation lever is provided with the state determination mark formed of a recess.

  According to a fourth aspect of the present invention, there is provided a measuring device that measures a measured amount of a clamp target based on the clamp sensor according to any one of the first to third aspects and a detected amount detected by the clamp sensor. And.

  The clamp sensor according to claim 1, wherein the pair of clamp arms constituting the sensor unit and the first clamp arm are separated from each other by rotating at least one clamp arm in the first rotation direction. An operation lever capable of performing an operation of shifting to a state of the above, and an operation of shifting at least one of the clamp arms in a second rotational direction to a second state in which the tip ends of the pair of clamp arms are in contact with each other An opening for projecting the operating portion of the operating lever and a casing configured to accommodate at least one base end of the operating lever and a pair of clamp arms in the second state. It is a part that is sometimes visible and becomes invisible when at least one of the pair of clamp arms rotates in the first rotation direction from the position in the second state. The first mark defined in the part and the part that is invisible when the pair of clamp arms are in the second state, and at least one of the pair of clamp arms is first rotated from the position in the second state. The operation lever is provided with a state determination mark constituted by at least one of the second mark defined as a portion that is visible when rotated in the direction. According to a fourth aspect of the present invention, the measurement apparatus includes the clamp sensor and a measurement unit that measures a measured amount of the clamp target based on the detected amount detected by the clamp sensor.

  Therefore, according to the clamp sensor according to claim 1 and the measurement device according to claim 4, the clamp lever is provided on the operation lever even if the tip ends of both clamp arms are in contact with each other or are not directly visible. Based on whether or not the state determination mark can be visually recognized, it can be reliably and easily confirmed whether or not the tip portions of both clamp arms are in contact with each other. As a result, it is possible to suitably avoid a situation in which the measurement process is performed in a state in which the tip portions of both clamp arms are separated from each other, and as a result, an accurate measurement value for the clamp target can be obtained.

  In the clamp sensor according to claim 2, in the operation portion of the operation lever, when the pair of clamp arms are in the second state, the portion protrudes out of the casing from the opening, and at least one of the clamp arms is in the second state. A first mark as a state determination mark is defined at a portion that moves from the opening into the casing when rotating in the first rotation direction from the position. Therefore, according to the clamp sensor according to claim 2 and the measuring device including such a clamp sensor, the state determination cannot be performed in the first state without complicating the shape and configuration of the operation lever and the casing. Since the mark can be visually recognized in the second state, it is possible to sufficiently reduce the manufacturing cost of the clamp sensor and the measuring device that can easily check the state of both clamp arms.

  In the clamp sensor according to the third aspect, the state discriminating mark formed by the concave portion is provided on the operation lever. Therefore, according to the clamp sensor according to claim 3 and the measuring device including such a clamp sensor, a configuration including a state determination mark configured by a convex portion, or a configuration configured by pasting of a film or a printed material Unlike the configuration provided with the determination mark, the state determination mark does not come into contact with the casing when the operation lever is operated, and therefore it is possible to suitably avoid the situation determination mark from being worn and difficult to see. In addition, the operation lever can be operated smoothly without hindering the operation of the operation lever due to the presence of the state determination mark.

1 is a configuration diagram of a measuring device 1. FIG. 2 is an external perspective view of a clamp sensor 2. FIG. 3 is an exploded perspective view of the clamp sensor 2. FIG. It is a partially transparent front view of the clamp sensor 2 in a state where the clamp arms 11 and 12 are normally closed. It is an external appearance perspective view of the clamp sensor 2 in which the clamp arms 11, 12 are normally closed. FIG. 6 is a partially transparent front view of the clamp sensor 2 in which the clamp arms 11 and 12 are slightly opened. It is an external appearance perspective view of the clamp sensor 2 in which the clamp arms 11 and 12 are slightly opened. It is a bottom view of clamp sensor 2A concerning other embodiments. It is a partial transmission front view of clamp sensor 2B concerning other embodiments. It is a partial transmission front view of clamp sensor 2C concerning other embodiments.

  Hereinafter, embodiments of a clamp sensor and a measuring apparatus will be described with reference to the accompanying drawings.

  The measuring apparatus 1 shown in FIG. 1 is a non-contact type current measuring apparatus which is an example of a “measuring apparatus”, and a magnetic field (“ An example of “amount to be detected”) is detected, and a current value (an example of “amount to be measured”) of the current flowing in the clamp target X is measured based on the detected magnitude of the magnetic field. Specifically, the measuring device 1 includes a clamp sensor 2 and a measuring device main body 3.

  The clamp sensor 2 is an example of a “clamp sensor”, and as shown in FIGS. 2 and 3, an annular sensor unit 10 composed of clamp arms 11 and 12, a lever 13, rotating shafts 14 and 14, and a casing. 15 and a signal cable 16. The actual clamp sensor 2 includes a sensor board provided between the magnetic detection circuit in the clamp arms 11 and 12 and the signal cable 16, a spring for urging the clamp arm 12 and the lever 13 as will be described later. However, in order to facilitate understanding of the configuration of the clamp sensor 2, illustration and description thereof are omitted.

  The clamp arms 11 and 12 are an example of “a pair of clamp arms”, and as shown in FIG. 4, each of the clamp arms 11 and 12 is formed in a front view arc shape, and the distal end portions 11 a and 12 a and the proximal end portions 11 b and 12 b. The ring-shaped sensor part 10 is comprised in the state which each contact | connected. In this case, in the clamp sensor 2 of this example, the clamp arm 11 is fixed so as not to rotate with respect to the casing 15, and the clamp arm 12 is formed integrally with the lever 13, and is connected to the casing 15 via the clamp arm 11. (The example of a configuration in which only the clamp arm 12 which is an example of “at least one of both clamp arms” is rotatable).

  Specifically, as shown in FIGS. 3, 4, and 6, the clamp arm 11 has an insertion hole 11 c through which the rotation shaft 14 for supporting the clamp arm 12 can be inserted in the vicinity of the base end portion 11 b (that is, , Provided in the vicinity of the base end portion 12 b of the clamp arm 12, and is fixed to the casing 15 so that the base end portion 11 b is accommodated in the casing 15. The clamp arm 12 has a shaft hole 12c to which the rotation shaft 14 can be attached in the vicinity of the base end portion 12b, and the clamp arm 11 (insertion hole) through the rotation shaft 14 attached to the shaft hole 12c. 11c). The clamp arm 12 is operated by operating the lever 13 as described later, with the center of the rotation shaft 14 (the insertion holes 11c and 12c) as the rotation center, the rotation direction of the arrow A1 shown in FIG. 1 ”) and a rotation direction of arrow A2 shown in FIG. 6 (an example of“ second rotation direction ”).

  The lever 13 is an example of an “operating lever”. In the clamp sensor 2 of this example, the lever 13 and the clamp arm are arranged such that the base end portion 13b of the lever 13 and the base end portion 12b of the clamp arm 12 are continuous. 12 is integrally formed. The lever 13 is pivotally supported with respect to the clamp arm 11 by the pivot shaft 14 attached to the shaft hole 12c of the clamp arm 12 in a state where the base end portion 13b is accommodated in the casing 15.

  Further, the lever 13 operates (pushes in) the operation portion 13a in the direction of the arrow B1 shown in FIG. 4 to rotate the clamp arm 12 in the direction of the arrow A1, and thereby the tip portions 11a of the clamp arms 11, 12. , 12a and the base end portions 11b, 12b are moved to an open state (an example of “first state”), and the operation portion 13a is operated in the direction of the arrow B2 shown in FIG. Is released), the clamp arm 12 is rotated in the direction of the arrow A2, and the distal end portions 11a, 12a of the clamp arms 11, 12 and the proximal end portions 11b, 12b are in contact with each other ("first" It is configured to be able to perform an operation of shifting to an example of “state 2”.

  In the clamp sensor 2 of the present example, the clamp arm 12 is always urged by a spring in a direction in which the clamp arm 12 rotates in the rotation direction of the arrow A2 shown in FIG. 6 and the lever 13 rotates in the rotation direction of the arrow B2. Has been. Therefore, in the clamp sensor 2 of this example, when the lever 13 is not operated, the state in which the sensor unit 10 has shifted to the “second state (closed state)” is maintained.

  The casing 15 is an example of a “casing” and accommodates the base end portions 11b and 12b of the clamp arms 11 and 12, the base end portion 13b of the lever 13 and the above-described sensor substrate, as shown in FIGS. An opening 15a (an example of an “opening”) that allows the operation portion 13a of the lever 13 to protrude is provided. One end of the signal cable 16 is fixedly connected to the sensor substrate in the casing 15, and a connection connector (not shown) that can be attached to and detached from the measuring apparatus main body 3 is connected to the other end.

  In this case, in the lever 13 in the clamp sensor 2 of the present example, as shown in FIGS. , When both the clamp arms 11 and 12 are in the “second state (closed state)”, as shown in FIGS. 6 and 7, the clamp arm 12 is moved from the position in the “second state” to the “first state”. ”In the direction of rotation (the direction of rotation of the arrow A1 shown in FIG. 4)”.

  Specifically, the lever 13 of the clamp sensor 2 projects out of the casing 15 from the opening 15a when both the clamp arms 11 and 12 are in the “second state (closed state)” in the operation portion 13a. A part that moves from the opening 15a into the casing 15 when the clamp arm 12 is rotated from the position in the “second state (closed state)” to the “first rotation direction”, that is, In the “second state”, an opening / closing state determination mark M1 is provided in the vicinity of the mouth edge of the opening 15a in the operation portion 13a protruding from the opening 15a.

  As an example, the open / close state determination mark M1 is formed of a recess in which one surface on the front side of the operation unit 13a is recessed in a small round shape when viewed from the front. In each drawing referred to in this specification, only the open / close state determination mark M1 provided on the front side of the operation unit 13a is illustrated, but the lever 13 of the clamp sensor 2 is provided on the back side of the operation unit 13a. A similar open / close state determination mark M1 is also formed.

  The measurement apparatus body 3 is an example of a “measurement unit”. In the measurement apparatus 1 of this example, a measurement circuit (not shown) in the measurement apparatus body 3 and the above-described sensor substrate in the clamp sensor 2 are signals of the clamp sensor 2. They are connected via a cable 16. The actual measurement apparatus body 3 includes an operation unit having a plurality of operation switches for setting measurement conditions and the like, a display unit for displaying measurement results, and the like. In order to facilitate understanding of the configuration of 1, the illustration and description thereof are omitted.

  When measuring the current value of the current flowing through the clamp target X by the measuring device 1, first, the clamp arm 12 is operated by operating the operating portion 13a of the lever 13 so as to be pushed into the casing 15 from the opening 15a. It is turned in the turning direction of arrow A1 shown in FIG. At this time, the distal end portion 12a and the proximal end portion 12b of the clamp arm 12 are separated from the distal end portion 11a and the proximal end portion 11b of the clamp arm 11, respectively. As a result, the sensor unit 10 is in the “first state (open state)”. Migrate to Next, the clamp object X is positioned between the clamp arms 11 and 12 so as to pass between the tip portions 11a and 12a of the clamp arms 11 and 12 (the clamp object X is positioned between the clamp arms 11 and 12). The clamp sensor 2 is moved so that the

  Subsequently, by operating the operation portion 13a in the opposite direction (releasing the push-in), the clamp arm 12 is rotated in the rotation direction of the arrow A2 shown in FIG. 6 by the biasing force of the spring. At this time, as a result of the distal end portion 12a and the proximal end portion 12b of the clamp arm 12 coming into contact with the distal end portion 11a and the proximal end portion 11b of the clamp arm 11, the sensor unit 10 is in the “second state (closed state). ) ”.

  In this case, as described above, when the outer diameter of the clamp target X is approximately the same as the inner diameter of the sensor unit 10 or when clamping the clamp sensor 2 with a large tilt with respect to the clamp target X, the sensor unit 10 ( The inner periphery of the clamp arms 11 and 12) may be in contact with the outer periphery of the clamp target X. In such a case, the clamp arms 11 and 12 are not completely closed, and a gap may be formed between the distal end portions 11a and 12a and between the proximal end portions 11b and 12b. In such a state, since the sensor unit 10 is separated at the distal end portions 11a and 12a and the proximal end portions 11b and 12b, the magnetic field generated by the current flowing through the clamp target X is correctly detected. It becomes difficult to measure the correct current value. Therefore, it is necessary to confirm whether both clamp arms 11 and 12 are completely closed during the above-described clamping operation.

  However, the base end portions 11b and 12b of the clamp arms 11 and 12 are accommodated in the casing 15, and it is difficult to visually recognize the clamp arms 11, and the clamp arm 12 rotates about the shaft hole 12c on the base end portion 12b side. Therefore, when the both clamp arms 11 and 12 are in the “first state (open state)”, the gap generated between the base end portions 11b and 12b is very narrow. For this reason, it is difficult to confirm whether or not the clamp arms 11 and 12 are completely closed by visually recognizing the state of the base end portions 11b and 12b. As shown in FIGS. 5 and 7, the tip portions 11 a and 12 a are located behind the clamp target X in a state where the clamp target X is positioned between the clamp arms 11 and 12. For this reason, it is difficult to confirm whether or not the clamp arms 11 and 12 are completely closed by visually recognizing the state of the tip portions 11a and 12a.

  On the other hand, in the clamp sensor 2 of the present example, the operation part 13a of the lever 13 is provided with an open / close state determination mark M1. As shown in FIGS. 6 and 7, the open / close state determination mark M1 cannot be viewed in the casing 15 when both the clamp arms 11 and 12 are in the “first state (open state)”. As shown in FIGS. 2, 4, and 5, when both the clamp arms 11 and 12 are in the “second state (closed state)”, they are located outside the casing 15 and can be visually recognized.

  In the clamp sensor 2 of this example, the open / close state determination mark M1 is provided on both the front surface and the back surface of the operation portion 13a of the lever 13, respectively. Therefore, even if the clamp target X is clamped with either the front or the back of the clamp sensor 2 facing forward (side closer to the eyes of the operator), the presence / absence of either of the open / closed state determination marks M1 is reliably recognized. It is possible to do.

  For this reason, in the clamp sensor 2 of this example, even if the state of the distal end portions 11a and 12a and the state of the base end portions 11b and 12b cannot be visually recognized, if the open / close state determination mark M1 of the operation portion 13a can be visually recognized, 11 and 12 are in the “second state (closed state)”, and the clamp arms 11 and 12 are in the “second state (closed state)” if the open / close state determination mark M1 cannot be visually recognized. It is possible to recognize that there is no (the clamp arms 11 and 12 are not completely closed). Therefore, when it is confirmed that the open / close state determination mark M1 is visible, the clamping of the clamp target X by the clamp sensor 2 is completed.

  Thereafter, the measurement unit is started by operating the operation unit of the measurement apparatus main body 3. At this time, a magnetic field generated around the clamp target X when a current flows through the clamp target X (electric wire or the like) is detected by the clamp sensor 2, and the measuring apparatus body 3 is clamped based on the magnitude of the detected magnetic field. The current value of the current flowing through the target X is calculated (measured). Thereby, the current value as the measurement result is displayed on the display unit of the measurement apparatus main body 3, and a series of measurement operations is completed.

  Thus, in the clamp sensor 2, the pair of clamp arms 11 and 12 constituting the sensor unit 10 and the clamp arm 12 are moved in the “first rotation direction (the rotation direction of the arrow A1 shown in FIG. 4)”. An operation of rotating the clamp arms 11 and 12 to move to the “first state (open state)” in which the distal ends 11a and 12a of the clamp arms 11 and 12 are separated from each other, and the clamp arm 12 in the “second rotation direction (FIG. 6). The lever 13 can be operated to move to the “second state (closed state)” in which the distal ends 11a and 12a of the clamp arms 11 and 12 are in contact with each other. And a casing 15 provided with an opening 15a for projecting the operation portion 13a of the lever 13 and capable of accommodating the base end portion 13b of the lever 13 and the base end portion 12b of the clamp arm 12. It is a portion that is visible when the lamp arms 11 and 12 are in the “second state (closed state)” and the clamp arm 12 is moved from the position in the “second state (closed state)” to the “first rotation direction”. The lever 13 is provided with a “state discriminating mark” composed of an open / closed state discriminating mark M1 that is defined as a portion that cannot be visually recognized when it is turned to “”. In addition, the measuring apparatus 1 includes the clamp sensor 2 described above and a measuring apparatus body 3 that measures the “measured amount” for the clamp target X based on the “detected amount” detected by the clamp sensor 2. ing.

  Therefore, according to the clamp sensor 2 and the measuring apparatus 1, the open / close state determination mark M1 provided on the lever 13 can be visually recognized even if the tip portions 11a and 12a are not directly visible or in contact with each other. Whether or not the tip portions 11a and 12a of the clamp arms 11 and 12 are in contact with each other can be reliably and easily confirmed. As a result, it is possible to preferably avoid a situation where the measurement process is performed in a state where the distal end portions 11a and 12a of both the clamp arms 11 and 12 are separated from each other. As a result, an accurate measurement value for the clamp target X (current in this example) Value).

  Further, in this clamp sensor 2, in the operation portion 13a of the lever 13, when both the clamp arms 11 and 12 are in the “second state (closed state)”, the clamp sensor 2 is a portion that protrudes outside the casing 15 from the opening 15a. When the clamp arm 12 is rotated in the “first rotation direction” from the position in the “second state (closed state)”, the “state determination mark” is indicated on the part that moves into the casing 15 from the opening 15a. "Open / close state determination mark M1" is provided. Therefore, according to the clamp sensor 2 and the measuring apparatus 1, the open / closed state determination mark M1 that cannot be visually recognized in the “first state” is displayed in the “second state” without complicating the shape and configuration of the lever 13 and the casing 15. Therefore, the manufacturing cost of the clamp sensor 2 (measuring device 1) that can easily check the state of the clamp arms 11 and 12 can be sufficiently reduced.

  Further, in the clamp sensor 2, an open / close state determination mark M 1 as a “state determination mark” formed of a concave portion is provided on the lever 13. Therefore, according to the clamp sensor 2 and the measuring apparatus 1, the configuration including the “state determination mark” configured by the convex portion, or the configuration including the “state determination mark” configured by pasting or printed matter such as a film. Unlike the case, since the open / close state determination mark M1 does not contact the casing 15 when the lever 13 is operated, it is possible to suitably prevent the open / close state determination mark M1 from being worn and difficult to visually recognize, and The lever 13 can be operated smoothly without the operation of the lever 13 being hindered by the presence of the open / close state determination mark M1.

  Note that the configurations of the “clamp sensor” and the “measuring device” are not limited to the configuration examples of the clamp sensor 2 and the measuring device 1 described above. For example, the clamp sensor 2 having the configuration in which the open / close state determination mark M1 is provided on one surface on the front side and one surface on the back side of the operation portion 13a of the lever 13 has been described as an example. It is also possible to employ a configuration in which “state determination marks” are provided only on either one side or one side of the back side.

  Further, the position where the “state determination mark” is provided is not limited to one surface on the front side and one surface on the back side of the “operation unit”, and the lower surface of the operation unit 13a of the lever 13 as in the clamp sensor 2A shown in FIG. An open / close state determination mark M2 (an open / close state determination mark M2 configured by a bottom-view line-shaped recess in the example shown in the figure), which is an example of the “first mark”, is provided on one side (bottom side). It can also be provided as a “state determination mark”. In the clamp sensor 2A shown in the figure and the clamp sensors 2B and 2C shown in FIGS. 9 and 10 referred to later, components having the same functions as those of the above-described clamp sensor 2 are denoted by the same reference numerals. Therefore, a duplicate description is omitted.

  Further, when an “operating lever” of a type that slides in the width direction of the “casing” with respect to the “casing” instead of the lever 13 that rotates with respect to the casing 15, the “operating lever” “ A “first mark” may be provided as a “state determination mark” on one surface on the upper surface side of the operation unit (not shown). Further, the shape of the “state determination mark” is not limited to the small round shape such as the above-described opening / closing state determination mark M1 or the linear shape such as the opening / closing state determination mark M2, and may be any shape. Can do. Further, the present invention is not limited to the “state determination mark” configured by a concave portion, and a “state determination mark” configured by a convex portion may be provided.

  Further, like the clamp sensor 2B shown in FIG. 9, the open / close state determination mark M3 (another example of the “first mark”) in which a part of the lever 13 (operation portion 13a) is colored is referred to as “state determination”. It can also be provided as a “use mark”. In this case, as the “state determination mark” composed of colored portions such as the open / close state determination mark M3, a mark of a color different from the color of the “operation lever” itself is printed on the surface of the “operation lever”. , Affix a film with a color different from the color of the “operating lever” itself on the surface of the “operating lever”, or change the color of the material used as the “state determination mark” to Can be different colors.

  Furthermore, the configuration in which the open / close state determination marks M1 to M3 as the “first marks” are provided as the “state determination marks” on the lever 13 has been described as an example, but instead of such a configuration (or In addition to such a configuration, a configuration in which the “second mark” is provided in the “operation lever” as the “state determination mark” may be employed.

  As an example, the lever 13 of the clamp sensor 2C shown in FIG. 10 is provided with an open / close state determination mark M4 as an example of a “second mark” as a “state determination mark”. In this case, in the clamp sensor 2 </ b> C, the casing 15 is provided with an opening 15 b that allows the open / close state determination mark M <b> 4 to be visible when the lever 13 is pushed into the casing 15. In the clamp sensor 2C, as shown in the figure, when the pair of clamp arms 11 and 12 are in the “second state (closed state)”, the open / close state determination mark M4 is not positioned so as to overlap the opening 15b. Therefore, in the “second state”, the open / close state determination mark M4 cannot be visually recognized. Further, when both the clamp arms 11 and 12 are in the “first state (open state)”, the lever 13 is pushed in the direction of the arrow B1, and the open / close state determination mark M4 moves to a position where it overlaps the opening 15b. In the “first state”, the open / close state determination mark M4 can be visually recognized.

  Therefore, by providing the “second mark” as the “state determination mark” like the open / close state determination mark M4 in the clamp sensor 2C, when the “state determination mark” is visible, “a pair of clamp arms When the “state determination mark” cannot be visually recognized, the distal ends and the proximal ends of the “pair of clamp arms” are separated from each other. It can be surely and easily confirmed that “the second state” is in contact with

  Further, the clamp sensor 2 configured to rotate only the clamp arm 12 of the both clamp arms 11 and 12 has been described as an example. However, a configuration in which both “a pair of clamp arms” are rotated is adopted. (Not shown). In this case, as a configuration for rotating both “clamp arms”, a configuration in which both “clamp arms” are respectively rotated by one “operation lever”, or a “clamp arm” for rotating one “clamp arm” is provided. It is possible to adopt a configuration in which an “operating lever” and an “operating lever” for rotating the other “clamp arm” are separately provided. Even when these configurations are employed, the same effects as those of the above-described examples can be obtained by providing the “control lever” with the “state determination mark”.

  Furthermore, the clamp arms 2 and 2A to 2C have been described by taking as an example the configuration of the clamp sensors 2 and 2A to 2C in which the distal ends 11a and 12a and the proximal ends 11b and 12b of the clamp arms 11 and 12 are in contact with each other. The base ends of the “clamp arms” are maintained in proximity to each other, and only the tip ends of the “pair of clamp arms” are in contact with each other (a gap is generated between the base ends of both clamp arms in the closed state). It can also be applied to the “clamp sensor” of the configuration. In addition, the configuration of the measuring device 1 in which the clamp sensor 2 (2A to 2C) and the measuring device main body 3 are formed separately has been described as an example, but the applicant discloses in the above-mentioned patent document. Like a clamp meter, a “clamp sensor” and a “measurement unit” can be integrally formed to constitute a “measurement device”.

DESCRIPTION OF SYMBOLS 1 Measuring apparatus 2,2A-2C Clamp sensor 3 Measuring apparatus main body 10 Sensor part 11,12 Clamp arm 11a, 12a Tip part 11b, 12b, 13b Base end part 11c Insertion hole 12c Shaft hole 13 Lever 13a Operation part 14 Rotating shaft 15 Casing 15a, 15b Opening 16 Signal cable M1 to M5 Open / closed state identification mark X Target for clamping

Claims (4)

A pair of clamp arms that are formed in an arc shape and form an annular sensor portion in a state where the tip portions are in contact with each other;
The at least one of the pair of clamp arms is rotated in the first rotation direction around the rotation shaft disposed in the vicinity of the base end in the at least one of the pair of clamp arms. An operation for shifting to a first state in which the pair is separated from each other, and at least one of the pair is rotated about a rotation axis in a second rotation direction opposite to the first rotation direction. An operation lever capable of shifting to the second state in which the distal ends of the clamp arms are in contact with each other;
A clamp sensor provided with an opening for projecting the operation portion of the operation lever and a casing configured to accommodate the base end portion of the operation lever and the at least one base end portion;
The operation lever is a portion that is visible when the pair of clamp arms is in the second state, and the at least one of the pair of clamp arms is located at the first state from the position in the second state. A pair of clamp arms that are not visible when the pair of clamp arms are in the second state and the first mark defined as a portion that is not visible when rotated in the rotation direction. The state determination is configured such that at least one of the second mark and the second mark defined as a portion that is visible when the at least one of the second state rotates in the first rotation direction from the position in the second state. Clamp sensor with mark for use.   The operating lever is a portion of the operating portion that protrudes out of the casing from the opening when the pair of clamp arms is in the second state, and at least one of the pair of clamp arms is in the second state. 2. The first mark as the state determination mark is defined in a portion that moves from the opening to the casing when being rotated in the first rotation direction from the position at. Clamp sensor.   The clamp sensor according to claim 1 or 2, wherein the operation lever is provided with the state determination mark formed of a recess.   4. A measuring apparatus comprising: the clamp sensor according to claim 1; and a measuring unit that measures a measured amount of a clamp target based on a detected amount detected by the clamp sensor.

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