Clamp sensors and measuring devices

Abstract

To reliably and easily perform retention and open / close operation while reducing manufacturing costs.SOLUTION: A clamp sensor includes: clamp arms 11, 12 that constitute an annular sensor part 10 in a closed state, with both of the clamp arms 11, 12 configured to be rotatable round a pivot shaft 30 disposed near end parts 11b, 12b of the clamp arms 11, 12 in such that the end parts 11a, 12a come close to and move away from each other, and also includes operational arms 21, 22 respectively disposed extending from the end parts 11b, 12b of the clamp arms 11, 12 and configured so that rotation thereof around the pivot shaft 30 to approach each other can bring the clamp arms 11, 12 into an open state. The operational arms 21, 22 are formed in a curved shape where both of an outer edge E21o of the operational arm 21 and an outer edge E22o of the operational arm 22 are curved in the same direction when seen along the axial direction of the pivot shaft 30.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a clamp sensor that has a pair of clamp arms that form a ring-shaped sensor section when in a closed state with their tips close together, and that is configured so that both clamp arms can be rotated to move the tips closer and farther apart, and to a measuring device that is configured with such a clamp sensor. [Background technology]

[0002] As this type of clamp sensor, the applicant has disclosed a clamp sensor having a pair of clamp portions that can be opened and closed in the following patent document.

[0003] In the clamp sensor disclosed by the applicant, the base ends of both clamping parts are rotatably supported by a pair of support shafts inside the outer case part (main body part), and both clamping parts are constantly biased by a coil spring so that their tip ends are in contact with each other (closed state).The clamp sensor disclosed by the applicant also includes a pair of operating levers for moving the tip ends of both clamping parts to a state in which they are spaced apart (open state).In this case, both operating levers in this clamp sensor are disposed on both left and right sides of the outer case part (main body part) and are supported by a pair of support shafts inside the outer case part, and are configured so that the ends opposite to those supported by the support shafts (hereinafter also referred to as "operation side ends") can be rotated relative to the outer case part so as to move them closer to each other, thereby moving both clamping parts to the open state.

[0004] Furthermore, the clamp sensor disclosed by the applicant includes a locking mechanism for preventing the closed clamp portions from unintentionally transitioning to an open state. In this case, the locking mechanism in this clamp sensor includes an operating piece and an opening prevention piece. In this locking mechanism, the opening prevention piece is moved between the base ends of the closed clamp portions as the operating piece is slid relative to the outer case, thereby restricting the rotation of the clamp portions (i.e., the transition from the closed state to the open state). Furthermore, the opening prevention piece is retracted from between the base ends of the clamp portions as the operating piece is slid in the opposite direction relative to the outer case, thereby allowing the rotation of the clamp portions (the transition to the open state).

[0005] To use this clamp sensor, both clamp sections, which have been switched to the closed state, are switched to the open state. If the locking mechanism prevents the clamp sections from being opened, the operation lever is slid to retract the opening prevention piece from between the clamp sections, thereby releasing the restriction. Next, the operating levers are rotated relative to the outer case, with the operating ends moving closer together. The base ends of both clamp sections are pressed by the operating levers, causing them to rotate against the biasing force of the coil springs and enter the open state. In this state, the clamp target (conductor to be measured) is positioned between the clamp sections, passing between their tip ends.

[0006] Next, the operating force applied to both operating levers is reduced. At this time, the biasing force of the coil spring causes both clamp parts to rotate and transition to the closed state. Next, the operating piece is slid to move the opening prevention piece between the two clamp parts. This restricts the rotation of both clamp parts by the locking mechanism (opening prevention piece), preventing them from transitioning from the closed state to the open state. As a result, both clamp parts remain in the closed state even if the hand holding the clamp sensor touches both operating levers. Thereafter, the measured quantity of the clamped object is measured based on the signal detected by the clamp sensor. Furthermore, when the measurement operation is completed, both clamp parts are transitioned to the open state in the same manner as described above, and the clamp sensor is released from the clamped object. This completes the series of operations. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2004-125410 A (pages 3-6, figures 1-5) Summary of the Invention [Problem to be solved by the invention]

[0008] However, the clamp sensor disclosed by the applicant has the following problems that need to be improved.

[0009] Specifically, in the clamp sensor disclosed by the applicant, both clamp portions are supported by separate support shafts within the outer case, and both operating levers are supported by separate support shafts within the outer case. In other words, to enable both clamp portions to be opened and closed, this clamp sensor requires a pair of operating levers formed separately from the clamp portions, and four support shafts for supporting both clamp portions and both operating levers. As a result, this clamp sensor requires a large number of components, making assembly during manufacturing complicated, which makes it difficult to reduce manufacturing costs.

[0010] Furthermore, in one example of the clamp sensor disclosed by the applicant, the clamp sensor is held in one hand with the pad of the thumb placed on one of the operating levers and the pads of the index finger (or index finger and middle finger) placed on the other operating lever, and both clamp sections can be shifted from a closed state to an open state by operating both operating levers so that the pad of the thumb and the pads of the index finger (or index finger and middle finger) approach each other. Furthermore, in this clamp sensor, when viewed along the axial direction of each of the aforementioned support shafts, the outer edges of both operating levers (the portions where the pads of the thumb and index finger (or thumb, index finger and middle finger) are placed) and the outer lateral edges of the outer case (the portions where the pads of the little finger, ring finger and middle finger (or little finger and ring finger) and thenar eminence (base of the thumb) are placed) are each formed in a straight line.

[0011] In this case, in the clamp sensor disclosed by the applicant, the outer edges of both operating levers and Outer case The outer side edges of the case are textured to prevent slipping. However, depending on the size of the user's hand and how the case is held during use, when force is applied to operate the operating levers, the thumb and index finger (or thumb, index finger, and middle finger) may slip off the operating levers, or the little finger, ring finger, and middle finger (or little finger and ring finger) and the ball of the thumb may slip off the outer case. For this reason, it is desirable to improve this aspect.

[0012] The present invention was made in consideration of the above-mentioned problems that need to be improved, and its main object is to provide a clamp sensor and measuring device that can be held and opened and closed reliably and easily while reducing manufacturing costs. [Means for solving the problem]

[0013] The clamp sensor according to claim 1 comprises a pair of clamp arms formed in an arc shape and constituting an annular sensor unit in a closed state with their tip ends abutting against each other, and is configured so that the clamp arms are rotatable about a rotation axis disposed near the base ends of the clamp arms so as to move the tip ends toward and away from each other, and further comprises a pair of operating arms respectively extending from the base ends of the clamp arms and configured so that the clamp arms can be moved toward an open state in which the tip ends are spaced apart by rotating the operating arms about the rotation axis so as to move them toward each other, and when viewed along the axial direction of the rotation axis, both of the operating arms have a first outer edge portion on the opposite side of the operating arm from the other operating arm and a second outer edge portion on the opposite side of the other operating arm from the one operating arm. From the one operating arm to the other operating arm The operating arms are formed in a curved shape that is curved in the same direction, and the first distance between the end of the one operating arm opposite the clamp arm side and the pivot axis is shorter than the second distance between the end of the other operating arm opposite the clamp arm side and the pivot axis.

[0014] Claim 2 The clamp sensor described in claim 1 In the described clamp sensor, a connection cable for connecting the clamp sensor to an external device is drawn out from the end of the other operating arm on the side opposite to the clamp arm side.

[0015] Claim 3 The clamp sensor described is Claim 1 or 2 In the described clamp sensor, when viewed along the axial direction, both of the operating arms are formed in a curved shape such that the third outer edge portion of one operating arm on the side of the other operating arm and the fourth outer edge portion of the other operating arm on the side of the one operating arm are curved in the same direction as the first outer edge portion and the second outer edge portion.

[0016] Claim4 The clamp sensor described in claim 3 In the described clamp sensor, the two operating arms are formed so that, when viewed along the axial direction, the portion of the third outer edge portion that faces the fourth outer edge portion and the portion of the fourth outer edge portion that faces the third outer edge portion have the same shape.

[0017] Claim 5 The clamp sensor described is The method according to claim 4 In clamp sensors ,before Both operation arms is before When switching to the closed state The aforementioned The third outer edge portion and the fourth outer edge portion are formed so as to be in close contact or nearly close contact with each other.

[0018] Claim 6 The clamp sensor described is The method according to any one of claims 1 to 5 In clamp sensors ,before Both operation arms is before In the closed state, the maximum width of the operating section formed by the two operating arms along the opening and closing direction of the two operating arms is formed to be equal to or less than the maximum width of the sensor section along the opening and closing direction, and the operating section is configured to exist within the range of the maximum width of the sensor section.

[0019] Claim 7 The measuring device according to the present invention comprises the steps of: 6 and a measuring unit that measures a measured quantity of a clamp object clamped by the clamp sensor. [Effects of the Invention]

[0020] Claim Article 1The clamp sensor described above includes a pair of operating arms that extend from the base ends of both clamp arms and are configured to be able to move the clamp arms to an open state in which the tip ends are spaced apart by rotating them about a rotation shaft so as to bring them closer to each other, and both operating arms are formed with a curved shape in which a first outer edge portion of one operating arm on the side opposite to the other operating arm side and a second outer edge portion of the other operating arm on the side opposite to the one operating arm side are both curved in the same direction when viewed along the axial direction of the rotation shaft. 7 The described measuring device is configured to include the clamp sensor and a measuring section.

[0021] Therefore, the claim Article 1 The clamp sensor and the claimed 7According to the described measuring device, by integrally forming one clamp arm and one operating arm and integrally forming the other clamp arm and the other operating arm, the number of components of the clamp sensor can be significantly reduced, thereby significantly reducing the manufacturing costs of the clamp sensor. Furthermore, because the first outer edge of one operating arm and the second outer edge of the other operating arm are curved in the same direction, when the clamp sensor is held with one hand (e.g., five fingers), the fingers can be placed on the first outer edge and the second outer edge in a natural position, allowing the clamp sensor to be held securely and easily and preventing it from being dropped unintentionally. Furthermore, by effectively preventing the fingers from slipping on the first outer edge and the second outer edge when operating both operating arms, the clamp arms can be opened and closed securely and easily. Furthermore, when the two operating arms are brought closer to each other to transition to the open state, the distance between the first and second outer edges of the operating arms is sufficiently short throughout the entire longitudinal direction, allowing even small hands to reliably and easily maintain the close-coupled state (open state of the two clamp arms). This allows for reliable and easy clamping of the clamping object (attaching the clamp sensor to the clamping object) and detachment of the clamp sensor from the clamping object. Furthermore, because the distance between the first and second outer edges is sufficiently short, the clamp sensor can be reliably and easily held by pinching the two operating arms between the thumb and index finger (or between the thumb, index finger, and middle finger), allowing for reliable and easy opening and closing of the clamp arms. This allows the clamp sensor to be held and opened in various positions without forcibly bending or straightening the wrist or elbow when clamping or detaching from the clamping object, compared to holding the clamp sensor with one hand by placing five fingers on both operating arms. Therefore, it is possible to reliably and easily clamp and remove an object that is located in a narrow space or in a high or low place.Furthermore, unlike configurations in which the first and second outer edges are curved in opposite directions so that they are widely separated at the center of the longitudinal direction of both operating arms, or configurations in which the first and second outer edges are linear along the longitudinal direction of both operating arms, the first and second outer edges are curved in the same direction, so that even when the clamp sensor is held with just two or three fingers, fingers placed on the inside of the curved shape are less likely to slip off the operating arm, and as a result, fingers placed on the outside of the curved shape are also less likely to slip off the operating arm. This allows the clamp sensor to be securely held with just two or three fingers, making it possible to effectively prevent the clamp sensor from being accidentally dropped.

[0022] Also, claims Article 1 With the clamp sensor and a measuring device equipped with the clamp sensor, the operating arms are formed so that the first distance between the end of one operating arm opposite the clamp arm side and the pivot shaft is shorter than the second distance between the end of the other operating arm opposite the clamp arm side and the pivot shaft, so that when holding the clamp sensor in one hand, the index finger, middle finger, ring finger, and little finger can be placed on the second outer edge of the other operating arm, and the thumb can be placed in a natural position on the end of the first outer edge of one operating arm opposite the clamp arm side, making it possible to open and close both clamp arms more reliably and easily.

[0023] Also, claims Article 1With the clamp sensor described above and a measuring device equipped with the clamp sensor, the operating arms are formed so that the first and second outer edges are curved in a direction from one operating arm to the other when viewed along the axial direction, so that when holding the clamp sensor in one hand, the thumb can be placed in a natural position on the first outer edge of one operating arm, and the index finger, middle finger, ring finger, and little finger can be placed in a natural position on the second outer edge of the other operating arm, making it possible to open and close the clamp arms more reliably and easily.

[0024] Also, claims 2 According to the described clamp sensor and a measuring device equipped with that clamp sensor, the connection cable for connecting the clamp sensor to the outside is pulled out from the end of the other operating arm on the side opposite the clamp arm. This means that, unlike a configuration in which the connection cable is pulled out from the end of one short operating arm on the side opposite the clamp arm, the connection cable pulled out from the end of the other long operating arm on the side opposite the clamp arm does not interfere with the operation of both operating arms, making it possible to open and close both clamp arms more reliably and easily.

[0025] Also, claims 3 According to the described clamp sensor and a measuring device equipped with that clamp sensor, both operating arms are formed so that, when viewed along the axial direction, the third outer edge portion of one operating arm on the side of the other operating arm and the fourth outer edge portion of the other operating arm on the side of one operating arm are both curved in the same direction as the first outer edge portion and the second outer edge portion.This makes it possible to sufficiently increase the width between the first outer edge portion and the third outer edge portion along the entire longitudinal direction of one operating arm, and to sufficiently increase the width between the second outer edge portion and the fourth outer edge portion along the entire longitudinal direction of the other operating arm, and to provide an aesthetically pleasing clamp sensor in which the first outer edge portion, second outer edge portion, third outer edge portion and fourth outer edge portion are all curved in the same direction.

[0026] Also, claims 4 According to the described clamp sensor and a measuring device equipped with the clamp sensor, the two operating arms are formed so that the portion of the third outer edge portion facing the fourth outer edge portion and the portion of the fourth outer edge portion facing the third outer edge portion have the same shape when viewed along the axial direction.As a result, when the two operating arms are operated in a direction to bring them closer to each other, the two operating arms abut over a sufficiently wide area of ​​the third outer edge portion and the fourth outer edge portion, and therefore, even if an excessively strong force is applied, damage or deformation of the two operating arms and the rotating shaft can be preferably avoided. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 2 is a configuration diagram of the measurement device 1 as seen from the front side. [Figure 2] 1 is a perspective view of the appearance of the clamp sensor 2 in a state in which the transition of the sensor unit 10 to the open state is restricted. [Figure 3] 1 is a perspective view of the appearance of the clamp sensor 2 in a state in which the sensor unit 10 is permitted to transition to an open state. [Figure 4] 1 is a perspective view of the appearance of the clamp sensor 2 in a state where the sensor unit 10 has been shifted to an open state. [Figure 5] 10 is a cross-sectional view of the operating unit 20 of the clamp sensor 2 in a state in which the sensor unit 10 is permitted to transition to an open state. FIG. [Figure 6] 10 is a cross-sectional view of the operating unit 20 of the clamp sensor 2 in a state in which the transition of the sensor unit 10 to the open state is restricted. FIG. [Figure 7] 1 is an external view of the clamp sensor 2 when the sensor unit 10 is allowed to transition to the open state, viewed along the axial direction of the rotation shaft 30. FIG. [Figure 8] 1 is an external view of the clamp sensor 2 when the sensor unit 10 is moved to the open state, viewed along the axial direction of the rotation shaft 30. FIG. [Figure 9]10 is an external view of the clamp sensor 2 when viewed along the axial direction of the rotation shaft 30 in a state in which the transition of the sensor unit 10 to the open state is restricted. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, embodiments of a clamp sensor and a measuring device will be described with reference to the accompanying drawings.

[0029] 1 is a non-contact current measuring device, an example of a "measuring device," that is configured to detect a magnetic field generated around a clamping object X (such as an electric wire) when a current flows through the clamping object X, and to measure the current value (an example of a "quantity to be measured") of the current flowing through the clamping object X based on the magnitude of the detected magnetic field. Specifically, the measuring device 1 is configured with a clamp sensor 2 and a measuring device main body 3.

[0030] Clamp sensor 2 is an example of a "clamp sensor" and, as shown in FIGS. 2 to 4, includes sensor unit 10, operating unit 20, pivot shaft 30 (see FIGS. 5 to 9), and signal cable 40. Sensor unit 10 includes arc-shaped clamp arms 11 and 12 (an example of a "pair of clamp arms"), and as shown in FIGS. 2 and 3, is configured so that, in a closed state where ends 11a and 12a are abutted against each other and ends 11b and 12b are abutted against each other, a ring-shaped magnetic detection circuit (not shown) is formed. In this case, in clamp sensor 2 of this example, ends 11a and 12a correspond to the "tip end" and ends 11b and 12b correspond to the "base end."

[0031] The operating unit 20 includes an operating arm 21 extending from the end 11b of the clamp arm 11 (integrally formed with the clamp arm 11), and an operating arm 22 (an example of a "pair of operating arms") extending from the end 12b of the clamp arm 12 (integrally formed with the clamp arm 12). That is, in the clamp sensor 2 of this example, one rod-shaped member is formed by connecting the end 11b of the clamp arm 11 and the end 21a of the operating arm 21, and another rod-shaped member is formed by connecting the end 12b of the clamp arm 12 and the end 22a of the operating arm 22.

[0032] In this case, as shown in Figures 7 to 9, clamp sensor 2 of this example is configured so that both clamp arms 11, 12 and operating arms 21, 22 can be rotated about rotation shaft 30 (an example of a "rotation shaft") disposed at end 21a of operating arm 21 and end 22a of operating arm 22 (an example of "vicinity of the base ends of both clamp arms"). Also, as shown in Figures 4 and 8, clamp sensor 2 is configured so that by rotating operating arms 21, 22 about rotation shaft 30 so as to bring operating arms 21, 22 (end 21b of operating arm 21 and end 22b of operating arm 22) closer to each other, both clamp arms 11, 12 can be transitioned to an open state in which ends 11a, 12a are separated from each other and ends 11b, 12b are separated from each other.

[0033] In the clamp sensor 2 of this example, the ends 21b, 22b correspond to the "ends opposite the clamp arm side." In addition, in the actual clamp sensor 2, biasing members that bias the operating arms 21, 22 in directions that move them away from each other are housed within the operating arms 21, 22, and a sensor board that is provided between the magnetic detection circuit in the sensor unit 10 and the signal cable 40 is housed within the operating arm 22; however, to facilitate understanding of the configuration of the clamp sensor 2, these are not shown in the drawings and are not described in detail.

[0034] Furthermore, in this clamp sensor 2, as shown in FIG. 7, both operating arms 21, 22 are formed so that the distance L21 (an example of a "first distance") between the end 21b of operating arm 21 (an example of "one operating arm") and the pivot axis 30 is shorter than the distance L22 (an example of a "second distance") between the end 22b of operating arm 22 (an example of "the other operating arm") and the pivot axis 30.

[0035] 7 to 9, the operating arms 21, 22 in the clamp sensor 2 of this example are formed so that, when viewed along the axial direction of the rotation shaft 30, an outer edge E21o (an example of a "first outer edge") on the side of the operating arm 21 opposite the operating arm 22 side, and an outer edge E22o (an example of a "second outer edge") on the side of the operating arm 22 opposite the operating arm 21 side, both have curved shapes that are curved in the same direction. Specifically, the operating arms 21, 22 are formed so that, when viewed along the axial direction, the outer edge E21o, E22o are curved in a direction from the operating arm 21 toward the operating arm 22 (downward in FIGS. 7 to 9).

[0036] In this case, in the clamp sensor 2 of this example, when an adult holds the clamp sensor 2 in one hand, the outer edge E22o of the operating arm 22 is curved with a gentle curvature that corresponds to the arc-shaped positions of the middle phalanges of the four fingers (index finger, middle finger, ring finger, and little finger) of the adult. Also, the outer edge E21o of the operating arm 21 is gently curved with substantially the same shape (substantially the same curvature) as the outer edge E22o of the operating arm 22.

[0037] Furthermore, when viewed along the axial direction, the operating arms 21, 22 in the clamp sensor 2 of this example have both an outer edge E21i (an example of a "third outer edge") on the operating arm 22 side of the operating arm 21 and an outer edge E22i (an example of a "fourth outer edge") on the operating arm 22 side formed in a curved shape that is curved in the same direction as the outer edge E21o of the operating arm 21 and the outer edge E22o of the operating arm 22 (in this example, the direction from the operating arm 21 to the operating arm 22).

[0038] Furthermore, when viewed along the axial direction, the operating arms 21, 22 of this example have the same shape at the portion of the outer edge E21i that faces the outer edge E22i and at the portion of the outer edge E22i that faces the outer edge E21i, resulting in complementary shapes for both clamp arms 11, 12. As a result, in the clamp sensor 2 of this example, as shown in Fig. 8, when both clamp arms 11, 12 are moved to the open state (when both operating arms 21, 22 are moved closer to each other), the outer edge E21i of the operating arm 21 and the outer edge E22i of the operating arm 22 are in almost tight contact with each other, resulting in no gap between the operating arms 21, 22.

[0039] 2 to 4, in the clamp sensor 2 of this example, a rotation restricting member 23 is attached to the operating arm 21. Specifically, as one example, an end 23a of the rotation restricting member 23 is pivotally supported at a midpoint between both ends 21a, 21b of the operating arm 21 so as to be rotatable relative to the operating arm 21.

[0040] As shown in Figures 7 and 8, this rotation restricting member 23 allows relative rotation of the operating arm 21 with respect to the operating arm 22 in a direction that transitions the clamp arms 11, 12 from a closed state to an open state when the end 23b is rotated relative to the operating arm 21 so that it does not abut against the operating arm 22 (unlocked state: as an example, a state in which the end 23b is rotated so that it is positioned on the end 21b side of the operating arm 21).

[0041] In this case, in the clamp sensor 2 of this example, the rotation restricting member 23 is pivotally supported on the operating arm 21 so that the end 23b is located at the end 21b of the operating arm 21 in the unlocked state. Also, in the clamp sensor 2 of this example, the pivotal support position of the rotation restricting member 23 with respect to the operating arm 21, the length of the rotation restricting member 23, the shape of the rotation restricting member 23, etc. are specified so that in the unlocked state, the rotation restricting member 23 is integrated with the operating arm 21 to resemble a single rod, and the rotation restricting member 23 is not present between the operating arms 21 and 22, as shown in Fig. 5. As a result, in the clamp sensor 2 of this example, the outer edge E21i of the operating arm 21 and the outer edge E22i of the operating arm 22 can be brought sufficiently close to each other (the outer edges E21i, E22i can be brought into close contact with each other) when both clamp arms 11 and 12 are switched to the open state.

[0042] Furthermore, as shown in Figure 9, when the rotation restricting member 23 is rotated relative to the operating arm 21 so that the end 23b abuts the outer edge E22i of the operating arm 22 (locked state), it restricts the relative rotation of the operating arm 21 with respect to the operating arm 22 in a direction that transitions the clamp arms 11, 12 from a closed state to an open state.

[0043] In this case, in the clamp sensor 2 of this example, as shown in Figure 6, when viewed along the axial direction of the rotation shaft 30, the rotation restricting member 23 and the operating arm 22 are formed so that an imaginary straight line (dotted line L1 shown in the same figure) passing through both end portions 23a, 23b of the rotation restricting member 23 in the locked state is perpendicular (or nearly perpendicular) to the abutment surface F22 (a surface along the two-dotted line L2 shown in the same figure) against which the end portion 23b (abutment surface F23) of the rotation restricting member 23 abuts on the operating arm 22.

[0044] 5, in the clamp sensor 2 of this example, a magnet M21 is disposed at the end 21b of the operating arm 21, and a magnet M23 is disposed at the end 23b of the rotation restricting member 23. As a result, in the clamp sensor 2 of this example, when the rotation restricting member 23 is transitioned to the unlocked state, the end 23b of the rotation restricting member 23 is maintained in a state where it is attracted to the end 21b of the operating arm 21 by the attractive forces of both magnets M21 and M23, and rotation of the rotation restricting member 23 relative to the operating arm 21 is restricted.

[0045] 6, in the clamp sensor 2 of this example, a magnet M22 is disposed in the middle between both end portions 22a, 22b of the operating arm 22. As a result, in the clamp sensor 2 of this example, when the rotation restricting member 23 is transitioned to the locked state, the end portion 23b of the rotation restricting member 23 is maintained in a state where it is attracted to E22i of the operating arm 22 by the attractive force between the magnet M22 and the magnet M23 of the rotation restricting member 23, and rotation of the rotation restricting member 23 relative to the operating arm 21 (i.e., release of the locked state) is restricted.

[0046] In addition, in the clamp sensor 2 of this example, as shown in Figures 7 and 9, the lengths and shapes of both clamp arms 11, 12 and both operating arms 21, 22 are specified so that the operating unit 20 is within the range of the maximum width W10 of the sensor unit 10 in the closed state (so that the maximum width W20 of the operating unit 20 is less than or equal to the maximum width W10 of the sensor unit 10).

[0047] Furthermore, in the clamp sensor 2 of this example, a signal cable 40 (an example of a "connection cable") for connecting the clamp sensor 2 to the measuring device main body 3 is connected to the sensor board inside the operating arm 22, and is also drawn out from the end 22b of the operating arm 22 to the outside of the operating arm 22, as shown in Figures 2 to 4. Furthermore, a connector (not shown) for connecting to the measuring device main body 3 is connected to the tip of the signal cable 40.

[0048] Meanwhile, the measuring device main body 3, for example, is integrally configured with components corresponding to the "external" and "measurement unit," as well as an "operation unit" having multiple operation switches for setting measurement conditions, etc., and a "display unit" for displaying measurement results, and is configured so that the signal cable 40 of the clamp sensor 2 can be connected / disconnected. This measuring device main body 3 houses the signal cable 40 and a measurement circuit that is connected to the sensor unit 10 (magnetic detection circuit) of the clamp sensor 2 via the aforementioned sensor board. Note that instead of this configuration of the measuring device main body 3, the components corresponding to the "external" and "measurement unit" can be configured separately from the "operation unit" and "display unit," etc.

[0049] When storing or transporting this measuring device 1, for example, the clamp sensor 2 (signal cable 40) is detached from the measuring device main body 3, and the rotation restricting member 23 is shifted to the locked state as shown in Figures 2 and 9. This allows the clamp sensor 2 to be stored or transported in a smart state in which the operation unit 20 is present within the range of the maximum width W10 of the sensor unit 10 in the closed state, as described above, and by restricting the sensor unit 10 from unintentionally shifting to the open state, it is possible to preferably prevent foreign matter from being caught between the ends 11a, 12b of the clamp arms 11, 12, which would cause deformation or damage to the clamp arms 11, 12.

[0050] On the other hand, when measuring the current value of the current flowing through the clamp object X using this measuring device 1, first, the clamp sensor 2 (signal cable 40) is connected to the measuring device main body 3. Next, when the rotation restricting member 23 has been shifted to the locked state as described above, the rotation restricting member 23 is rotated relative to the operating arm 21 to shift to the unlocked state as shown in FIGS. 3 and 7. This allows the operation of shifting both clamp arms 11 and 12 from the closed state to the open state.

[0051] In this case, in the clamp sensor 2 of this example, by rotating the rotation restricting member 23 with respect to the operating arm 21 until the end 23b of the rotation restricting member 23 is positioned at the end 21b of the operating arm 21, the attractive force between the magnet M21 disposed at the end 21b and the magnet M23 disposed at the end 23b restricts unintentional rotation of the rotation restricting member 23 with respect to the operating arm 21. This makes it possible to avoid a situation in which the rotation restricting member 23 in the unlocked state unintentionally rotates with respect to the operating arm 21, thereby interfering with the operation described below of bringing both operating arms 21, 22 closer to each other.

[0052] Next, as an example, the clamp sensor 2 is held in one hand by placing the operating portion 20 of the clamp sensor 2 on the palm, bending the index finger, middle finger, ring finger, and little finger, and placing the middle phalanx of each finger on the outer edge E22o of the operating arm 22, and placing the pad of the thumb on the outer edge E21o of the operating arm 21. Next, the operating arm 21 is operated by bringing the thumb closer to the index finger. At this time, the operating arm 21 is rotated about the rotation shaft 30 against the biasing force of a biasing member (not shown), and the operating arm 21 is brought closer to the operating arm 22. Furthermore, as the operating arm 21 rotates relative to the operating arm 22, the clamp arm 11, which is integrally formed with the operating arm 21, is rotated relative to the clamp arm 12, which is integrally formed with the operating arm 22. As a result, as shown in Figures 4 and 8, the sensor unit 10 is transitioned from a closed state to an open state, and the end 11a of the clamp arm 11 and the end 12a of the clamp arm 12 are separated from each other, and the end 11b of the clamp arm 11 and the end 12b of the clamp arm 12 are separated from each other.

[0053] In this case, in the clamp sensor 2 of this example, the outer edge E22o of the operating arm 22 is curved with a gentle curvature that corresponds to the arc-shaped positions of the middle phalanges of the four fingers (index finger, middle finger, ring finger, and little finger). Therefore, the force applied to the operating arm 22 when the operating arm 21 rotates relative to the operating arm 22 (the restoring force of the biasing member) can be received almost evenly by the four fingers, so that even a person with a weak grip can adequately support the operating arm 21 and can suitably maintain the state in which the four fingers are placed on the outer edge E22o of the operating arm 22 (suitably preventing the four fingers from slipping relative to the operating arm 22).

[0054] Furthermore, in the clamp sensor 2 of this example, the outer edge E21o of the operating arm 21 is gently curved in the same direction and with substantially the same shape (substantially the same curvature) as the outer edge E22o of the operating arm 22. Therefore, the force applied to the operating arm 21 when the operating arm 21 rotates relative to the operating arm 22 (the restoring force of the biasing member described above) can be received substantially evenly within a sufficiently wide area of ​​the thumb ball, so that the operating arm 21 can be favorably supported without pain in the thumb ball, and the thumb can be favorably maintained in contact with the outer edge E21o of the operating arm 21 (favorably preventing the thumb from slipping off the operating arm 21). Furthermore, because the outer edges E21o, E22o are similarly curved in the same direction, when the operating arms 21, 22 are brought close to each other, the distance between the outer edges E21o, E22o is sufficiently short throughout the entire longitudinal direction of the operating arms 21, 22. This allows even small hands to reliably and easily maintain the state in which both operating arms 21 and 22 are close to each other.

[0055] Furthermore, in the clamp sensor 2, as described above, the portion of the outer edge E21i of the operating arm 21 that faces the outer edge E22i of the operating arm 22 and the portion of the outer edge E22i that faces the outer edge E21i have the same shape, and are configured so that when the sensor unit 10 is operated to transition to the open state, the outer edges E21i, E22i are in close contact with each other, resulting in no gap between the operating arms 21, 22. Therefore, even if an unnecessarily strong force is applied to the operating arms 21, 22 in a direction that brings them closer to each other, a sufficiently wide area of ​​the outer edge E21i of the operating arm 21 and the outer edge E22i of the operating arm 22 are in contact with each other, and the force applied to the contact portion between the outer edge E21i and the outer edge E22i is dispersed, thereby making it possible to suitably avoid damage or deformation of the operating arms 21, 22.

[0056] In this case, unlike the clamp sensor 2 of this example, in a configuration in which the shapes of the opposing portions of the outer edge portions E21i, E22i are different, that is, in a configuration (not shown) in which the outer edge portions E21i, E22i come into point contact at some point in the longitudinal direction of the operating arms 21, 22 when the two operating arms 21, 22 are brought close to each other, a force is applied that tries to pull apart the support portions of the pivot shaft 30 of the two operating arms 21, 22, with the point contact portion of the outer edge portions E21i, E22i as a fulcrum, which may result in deformation or damage to the pivot shaft 30. In contrast, in the clamp sensor 2 of this example, the opposing portions of the outer edge portions E21i, E22i have the same shape, and when the two operating arms 21, 22 are brought close to each other, no portion corresponding to the above-mentioned "fulcrum" is created, and the outer edge portions E21i, E22i are in surface contact, thereby making it possible to preferably avoid deformation or damage to the pivot axis 30.

[0057] Next, the clamp target X is positioned between the clamp arms 11 and 12 by passing it between the ends 11a and 12a of both clamp arms 11 and 12 (the clamp sensor 2 is moved so that the clamp target X is positioned between the clamp arms 11 and 12). Subsequently, the force of the thumb operating the operating arm 21 is reduced.

[0058] At this time, the biasing force of a biasing member (not shown) causes operating arm 21 to rotate about pivot shaft 30 in a direction opposite to that during operation for the purpose of transitioning to the above-mentioned open state, and operating arm 21 is moved away from operating arm 22. Furthermore, as operating arm 21 rotates in the opposite direction relative to operating arm 22, clamp arm 11, which is integral with operating arm 21, rotates in the opposite direction relative to clamp arm 12, which is integral with operating arm 22, in a direction opposite to that during operation for the purpose of transitioning to the open state. As a result, as shown in FIGS. 3 and 7 , sensor unit 10 is transitioned from the open state to the closed state, and end 11a of clamp arm 11 and end 12a of clamp arm 12 come into contact with each other, and end 11b of clamp arm 11 and end 12b of clamp arm 12 come into contact with each other, and a ring-shaped magnetic detection circuit is formed in sensor unit 10.

[0059] Next, the rotation restricting member 23 is rotated relative to the operating arm 21 against the attractive force of the magnets M21, M23 to transition to a locked state as shown in FIGS. 2 and 9. Specifically, the rotation restricting member 23 is rotated relative to the operating arm 21 so that the end 23b (contact surface F23) of the rotation restricting member 23 abuts against the abutted surface F22 on the outer edge E22i of the operating arm 22. This restricts operation in a direction that brings the operating arms 21, 22 closer to each other, and the sensor unit 10 is maintained in the closed state. In this case, in the clamp sensor 2 of this example, the attractive force between the magnet M22 disposed on the operating arm 22 and the magnet M23 disposed on the rotation restricting member 23 keeps the end 23b of the rotation restricting member 23 in abutment against the outer edge E22i of the operating arm 22.

[0060] Furthermore, in the clamp sensor 2 of this example, when the clamp sensor 2 with the rotation restricting member 23 transitioned to the locked state is viewed along the axial direction of the rotation shaft 30, an imaginary line passing through both end portions 23a, 23b of the rotation restricting member 23 (an imaginary line along the extension direction of the rotation restricting member 23: one-dot chain line L1 shown in FIG. 6) is perpendicular (or nearly perpendicular) to an abutment surface F22 (two-dot chain line L2 shown in FIG. 6) with which the end portion 23b of the rotation restricting member 23 abuts on the operating arm 22. Therefore, when a force is applied in a direction that brings the two operating arms 21, 22 closer to each other, the abutment surface F23 of the rotation restricting member 23 is pressed perpendicular (or nearly perpendicular) against the abutment surface F22 of the operating arm 22, making it difficult for the abutment surface F23 to slip along the abutment surface F22 (i.e., the end portion 23b slips relative to the operating arm 22). As a result, the state in which the end 23b of the rotation restricting member 23 abuts against the outer edge E22i of the operating arm 22 is maintained more suitably.

[0061] Therefore, in the clamp sensor 2 of this example, it is possible to preferably prevent the rotation restricting member 23, which has been switched to the locked state, from unintentionally rotating relative to the operating arm 21 and operating the operating arms 21, 22 in a direction that would bring them closer to each other. This restricts the operation of switching the clamp arms 11, 12 from the closed state to the open state, and maintains the sensor unit 10 in the closed state. With the above, the clamping of the clamp object X by the clamp sensor 2 is completed.

[0062] Thereafter, the measurement process is started by operating the operation unit of the measurement device main body 3. At this time, the magnetic field generated around the clamp object X (such as an electric wire) due to the current flowing through the clamp object X is detected by the clamp sensor 2, and the measurement device main body 3 calculates (measures) the current value of the current flowing through the clamp object X based on the magnitude of the detected magnetic field. As a result, the current value as the measurement result is displayed on the display unit of the measurement device main body 3, and the series of measurement operations is completed.

[0063] Furthermore, when the measurement work is completed, the clamp object X is moved from between both clamp arms 11, 12 in the reverse order of the clamping work described above (the clamp sensor 2 is removed from the clamp object X). Furthermore, when transporting or storing, as described above, the rotation restricting member 23 is shifted to the locked state, and the clamp sensor 2 is removed from the measuring device main body 3. This completes the series of work steps.

[0064] In the clamp sensor 2 of this example, instead of the operation method of holding both operating arms 21, 22 with one hand by placing five fingers on each arm, as described above, both operating arms 21, 22 can also be held by pinching them with the thumb and index finger (or pinching them with the thumb and index finger and middle finger). In this case, since the distance between the outer edges E21o, E22o of the clamp sensor 2 of this example is sufficiently short, both operating arms 21, 22 can be held with two or 3 bottles Clamp sensor 2 can be reliably and easily held by pinching it with five fingers, allowing clamp arms 11, 12 to be reliably and easily opened and closed. This allows clamp sensor 2 to be held and opened in a variety of positions without forcibly bending or straightening the wrist or elbow when clamping or removing clamp sensor 2 from clamp object X, compared to holding clamp sensor 2 with one hand by placing five fingers on both operating arms 21, 22. Therefore, clamp sensor 2 can be moved toward or away from clamp object X in a variety of positions, and can be opened and closed in a variety of positions, even for clamp object X located in a narrow space or at a high or low place, allowing reliably and easily clamping or removing various clamp object X.

[0065] Furthermore, in the clamp sensor 2 of this example, unlike configurations in which outer edges E21o, E22o are curved in opposite directions so that they are widely spaced apart at the center in the longitudinal direction of both operating arms 21, 22, or configurations in which outer edges E21o, E22o are linear along the longitudinal direction of both operating arms 21, 22, outer edges E21o, E22o are curved in the same direction. This makes it difficult for fingers placed on the inside of the curved shape to slip off the operating arm (operating arm 21 in this example) even when the clamp sensor 2 is held with only two or three fingers. Therefore, it also makes it difficult for fingers placed on the outside of the curved shape to slip off the operating arm (operating arm 22 in this example). This allows the clamp sensor 2 to be securely held with only two or three fingers, effectively preventing the clamp sensor 2 from being accidentally dropped.

[0066] In this way, the clamp sensor 2 is provided with a pair of operating arms 21, 22 that extend from the ends 11b, 12b of both clamp arms 11, 12 and are configured to be able to move both clamp arms 11, 12 to an open state in which the ends 11a, 12a are spaced apart by rotating them about the rotation shaft 30 so that they approach each other, and both operating arms 21, 22 are formed into curved shapes in which the outer edge E21o of the operating arm 21 on the side opposite to the operating arm 22 side and the outer edge E22o of the operating arm 22 on the side opposite to the operating arm 21 side are both curved in the same direction when viewed along the axial direction of the rotation shaft 30. Furthermore, the measuring device 1 is configured to include the clamp sensor 2 and the measuring device main body 3 described above.

[0067] Therefore, with this clamp sensor 2 and measuring device 1, the clamp arm 11 and the operating arm 21 are integrally formed, and the clamp arm 12 and the operating arm 22 are integrally formed, thereby significantly reducing the number of components of the clamp sensor 2. This significantly reduces the cost of manufacturing the components and the assembly costs, thereby significantly reducing the manufacturing cost of the clamp sensor 2. Furthermore, because the outer edge E21o of the operating arm 21 and the outer edge E22o of the operating arm 22 are curved in the same direction, when the clamp sensor 2 is held with one hand (e.g., five fingers), each finger can be placed on the outer edge E21o, E22o in a natural position. This allows the clamp sensor 2 to be held securely and easily and prevents it from being accidentally dropped. Furthermore, slippage of the fingers on the outer edge E21o, E22o can be effectively prevented when operating both operating arms 21, 22, thereby allowing the clamp arms 11, 12 to be opened and closed securely and easily. Furthermore, when both operating arms are brought closer to each other to transition both clamp arms to an open state, the distance between outer edges E21o, E22o throughout the entire longitudinal direction of both operating arms 21, 22 is sufficiently short, so that even small hands can reliably and easily maintain the state in which both operating arms 21, 22 are close together (the open state of both clamp arms 11, 12). This makes it possible to reliably and easily clamp the clamp object X (attach the clamp sensor 2 to the clamp object) and detach the clamp sensor 2 from the clamp object X. Furthermore, because the distance between outer edges E21o, E22o is sufficiently short, both operating arms 21, 22 can be reliably and easily held by pinching them with the thumb and index finger (or with the thumb, index finger, and middle finger), and in this state, clamp arms 11, 12 can be reliably and easily opened and closed. This allows the clamp sensor 2 to be held in various positions and opened and closed without forcibly bending and straightening the wrist or elbow when clamping or removing the clamp sensor 2 from the clamp object X, compared to when holding the clamp sensor 2 with one hand by placing five fingers on both operating arms 21, 22.Therefore, clamp target X located in a narrow space or at a high or low place can be reliably and easily clamped and detached. Furthermore, unlike a configuration in which outer edges E21o, E22o are curved in opposite directions so that they are widely spaced apart at the center in the longitudinal direction of both operating arms 21, 22, or a configuration in which outer edges E21o, E22o are linear along the longitudinal direction of both operating arms 21, 22, outer edges E21o, E22o are curved in the same direction. Therefore, even when clamp sensor 2 is held with only two or three fingers, fingers placed on the inside of the curved shape are less likely to slip relative to the operating arm (operating arm 21 in this example). Consequently, fingers placed on the outside of the curved shape are also less likely to slip relative to the operating arm (operating arm 22 in this example). This allows clamp sensor 2 to be reliably held with only two or three fingers, effectively preventing unintentional dropping of clamp sensor 2.

[0068] Furthermore, according to this clamp sensor 2 and measuring device 1, both operating arms 21, 22 are formed so that the "first distance" (distance L21 in FIG. 7) between end 21b of operating arm 21 on the side opposite to clamp arm 11 and pivot shaft 30 is shorter than the "second distance" (distance L22) between end 22b of operating arm 22 on the side opposite to clamp arm 12 and pivot shaft 30. As a result, when holding clamp sensor 2 in one hand, with the index finger, middle finger, ring finger, and little finger placed on outer edge E22o of operating arm 22, the thumb can be placed in a natural position on the end 21b side of outer edge E21o of operating arm 21. This makes it possible to open and close both clamp arms 11, 12 more reliably and more easily.

[0069] Furthermore, according to this clamp sensor 2 and measuring device 1, both operating arms 21, 22 are formed so that outer edge E21o and outer edge E22o have a curved shape that curves in a direction from operating arm 21 toward operating arm 22 when viewed along the axial direction, so that when holding the clamp sensor 2 in one hand, the thumb can be placed in a natural position on outer edge E21o of operating arm 21, and the index finger, middle finger, ring finger, and little finger can be placed in a natural position on outer edge E22o of operating arm 22. This makes it possible to open and close both clamp arms 11, 12 more reliably and more easily.

[0070] Furthermore, with this clamp sensor 2 and measuring device 1, the signal cable 40 for connecting the clamp sensor 2 to the measuring device main body 3 (external) is pulled out from the end 22b of the operating arm 22 on the side opposite to the clamp arm 12. This means that, unlike a configuration in which the signal cable 40 is pulled out from the end 21b of the short operating arm 21, the signal cable 40 pulled out from the end 22b of the long operating arm 22 does not interfere with the operation of both operating arms 21, 22, and therefore the opening and closing operations of both clamp arms 11, 12 can be performed more reliably and more easily.

[0071] Furthermore, according to this clamp sensor 2 and measuring device 1, the operating arms 21, 22 are formed so that when viewed along the axial direction, both the outer edge E21i of the operating arm 21 on the operating arm 22 side and the outer edge E22i of the operating arm 22 on the operating arm 21 side have curved shapes that are curved in the same direction as the outer edge E21o and outer edge E22o.This makes it possible to sufficiently increase the width between the outer edge E21o, E21i over the entire longitudinal direction of the operating arm 21, and to sufficiently increase the width between the outer edge E22o, E22i over the entire longitudinal direction of the operating arm 22, and to provide a clamp sensor 2 with an excellent appearance in which all of the outer edge E21o, E21i, E22o, E22i are curved in the same direction.

[0072] Furthermore, according to this clamp sensor 2 and measuring device 1, the operating arms 21, 22 are formed so that when viewed along the axial direction, the portion of the outer edge E21i facing the outer edge E22 and the portion of the outer edge E22i facing the outer edge E21i have the same shape. Therefore, when the operating arms 21, 22 are operated in a direction to bring them closer to each other, the operating arms 21, 22 come into contact over a sufficiently wide area of ​​the outer edge E21i, E22i, and therefore damage or deformation of the operating arms 21, 22 and the pivot shaft 30 can be preferably avoided even if an excessively strong force is applied.

[0073] The configurations of the "clamp sensor" and the "measuring device" are not limited to the examples of the configurations of the clamp sensor 2 and the measuring device 1 described above.

[0074] For example, the configuration of the clamp sensor 2 has been described as an example in which the operating arms 21, 22 are formed so that the outer edge portions E21i, E22i of the operating arms 21, 22 have a curved shape that curves in the same direction as the outer edge portions E21o, E22o when viewed along the axial direction of the pivot shaft 30, but either or both of the "third outer edge portion" and the "fourth outer edge portion" can be curved in a direction opposite to the "first outer edge portion" and the "second outer edge portion", or can be non-curved (such as a straight or angular shape) (not shown).

[0075] Furthermore, the configuration of clamp sensor 2 has been described as an example in which both operating arms 21, 22 are formed so that distance L21 between end 21b of operating arm 21 and rotation shaft 30 is shorter than distance L22 between end 22b of operating arm 22 and rotation shaft 30, but both "operating arms" can also be formed so that the "first distance" in "one operating arm" and the "second distance" in "the other operating arm" are equal (not shown). Furthermore, the configuration of clamp sensor 2 has been described as an example in which rotation restricting member 23 is provided that can restrict operation of both operating arms 21, 22 in directions in which they approach each other, but the "clamp sensor" can also be configured without rotation restricting member 23.

[0076] Furthermore, while the example has been described in which signal cable 40 is connected to measuring device main body 3 as the "external" component, it is also possible to use an extension cable, signal amplifier, noise filter, etc. as the "external" component by connecting signal cable 40. Additionally, while the example has been described in which measuring device 1 and clamp sensor 2 are configured to measure the current value of the current flowing through clamp target X as the "quantity to be measured," it is also possible to employ the same configuration as measuring device 1 and clamp sensor 2 described above in "measuring devices" and "clamp sensors" that can measure various electrical parameters other than current values ​​as the "quantity to be measured." [Explanation of symbols]

[0077] 1. Measuring equipment 2 Clamp sensors 3. Measuring device body 10 Sensor section 11,12 Clamp arm 11a,11b,12a,12b End 20 Control section 21,22 Operation arm 21a, 21b, 22a, 22b end 23 Rotation restriction member 23a,23b end 30 Rotating Axis 40 Signal Cable E21o, E21i, E22o, E22i outer edge F22 Abutted surface F23 Contact surface L1 dash-dot line L2 double-dashed line L21,L22 distance M21~M23 Magnet W10, W20 width X Clamp Target

Claims

1. A clamp sensor comprising a pair of clamp arms formed in an arc shape and constituting an annular sensor section in a closed state with tip ends abutting against each other, and configured so that both clamp arms can be rotated about a rotation axis disposed near base ends of both clamp arms so as to move the tip ends toward and away from each other, a pair of operating arms that are respectively extended from the base ends of the clamp arms and that are configured to be able to move the clamp arms to an open state in which the tip ends are spaced apart by rotating the operating arms about the rotation axis so as to bring them closer to each other, When viewed along the axial direction of the pivot shaft, both of the operating arms have a first outer edge portion on the opposite side of the other operating arm from the operating arm of the other operating arm and a second outer edge portion on the opposite side of the other operating arm from the one operating arm, both of which are formed in a curved shape that curves in the same direction from the one operating arm to the other operating arm, and the clamp sensor is formed so that a first distance between the end of the one operating arm on the opposite side to the clamp arm and the pivot shaft is shorter than a second distance between the end of the other operating arm on the opposite side to the clamp arm and the pivot shaft.

2. 2. The clamp sensor according to claim 1, wherein a connection cable for connecting the clamp sensor to an external device is drawn out from the end of the other operating arm on the side opposite to the clamp arm side.

3. A clamp sensor as described in claim 1 or 2, wherein when viewed along the axial direction, both of the operating arms have a third outer edge portion on one operating arm side facing the other operating arm and a fourth outer edge portion on the other operating arm side facing the one operating arm, both of which are formed in a curved shape curved in the same direction as the first outer edge portion and the second outer edge portion.

4. The clamp sensor of claim 3, wherein the operating arms are formed so that the portion of the third outer edge portion facing the fourth outer edge portion and the portion of the fourth outer edge portion facing the third outer edge portion have the same shape when viewed along the axial direction.

5. A clamp sensor as described in Claim 4, wherein the two operating arms are formed so that the third outer edge portion and the fourth outer edge portion are in close contact or nearly in close contact when the operation to transition to the closed state is performed.

6. A clamp sensor described in any one of claims 1 to 5, wherein the two operating arms are formed so that, in the closed state, the maximum width of the operating section formed by the two operating arms along the opening and closing direction of the two operating arms is equal to or less than the maximum width of the sensor section along the opening and closing direction, and the operating section is configured to exist within the range of the maximum width of the sensor section.

7. A clamp sensor according to any one of claims 1 to 6; A measuring device comprising a measuring unit that measures a measured quantity of a clamped object clamped by the clamp sensor.

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