JP5129420B2 - Clamp sensor opening and closing mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a clamp sensor opening / closing mechanism that can easily clamp a conductor under measurement in a live state even in a relatively narrow space.
[0002]
[Prior art]
FIG. 6 is a front view showing an example of a conventional clamp-type ammeter, and the clamp-type ammeter 1 is composed of a meter body 2 and a clamp sensor 4 disposed on the meter body 2 so as to be freely opened and closed. ing.
[0003]
In this case, the clamp sensor 4 includes a left clamp unit 5 and a right side in which current sensors (not shown) are separately housed in a left holder 6 and a right holder 8 as a resin molded product that are combined in a substantially annular shape. It is formed by attaching the clamp part 7 to the instrument main body 2 via the shaft support part under a state in which a tension coil spring is interposed between base end parts (not shown) and is always biased in the closing direction. Yes.
[0004]
The clamp sensor 4 composed of the left clamp part 5 and the right clamp part 7 is expanded in the left-right direction by pressing a pair of opening / closing operation levers 3, 3 arranged on the instrument body 2. Can be opened.
[0005]
Therefore, when the clamp-type ammeter 1 shown in FIG. 6 is used, for example, when measuring the measured conductor L surrounded by the obstacle W as shown in FIG. If the left and right maximum width a between the left side clamp part 5 and the right side clamp part 7 is exceeded, the conductor L to be measured can be smoothly clamped.
[0006]
[Problems to be solved by the invention]
However, as shown in FIG. 7 (b), the introduction space b to the conductor L to be measured surrounded by the obstacle W is slightly less than the left-right maximum width a, for example, substantially the same as the lateral width of the meter body 2. If not, there is a disadvantage that the conductor L to be measured cannot be clamped.
[0007]
In view of the above-mentioned problems found in the prior art, the present invention provides a clamp sensor opening and closing mechanism that can easily clamp a conductor under measurement in a live state even in a relatively narrow space. There is a purpose.
[0008]
[Means for Solving the Problems]
The present invention has been made in order to achieve the above object, and is a double-open type clamp sensor comprising a pair of sensor portions that are both open and closably attached in the lateral width direction of the main body portion. The sensor parts are pivotally supported on the main body part side so as to be axially rotatable through support shaft parts fixed to the respective base end parts, and the opening operation part disposed on the main body part is non-rotating. Automatic formation of the normally closed state between the sensor parts during operation, and forced release of the normally closed state at a position where each sensor part is within the lateral width of the main body part due to forced rotation of each spindle part during operation The pair of sensor portions are arranged so that force can be freely applied, and the mutual maximum width when the pair of sensor portions is closed is substantially the same as the lateral width of the main body portion .
[0009]
In this case, it is preferable that the pair of sensor portions have a positional relationship in which the open front end surfaces face each other when closed. In addition, it is desirable that the pair of sensor portions be freely arranged between the main body portion and the closed position and / or the open position .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view showing a preferred example of the present invention applied to a clamp-type ammeter with a part thereof omitted, in which (a) is a front view and (b) is a right side view. , (C) shows plan views respectively.
[0011]
According to the figure, the clamp-type ammeter 11 has a double opening provided with a clamp sensor 32 comprising a pair of sensor portions 33 and 43 attached to the top portion 13 side of the main body portion 12 so that both are movable and can be opened and closed. It is formed as a structure.
[0012]
In this case, the pair of sensor portions 33 and 43 are formed by separately storing current sensors (not shown) in the one side holder 34 and the other side holder 44 made of an insulating resin material.
[0013]
Moreover, the one sensor portion 33 is formed by a rectilinear portion 33a that substantially straightly moves upward from the left end side of the top portion 13 of the main body portion 12, and an arc-shaped portion 33b that continues to the rectilinear portion 33a and curves inward. ing. Similarly, the other sensor unit 43 includes a rectilinear portion 43a that substantially straightly moves upward from the right end side of the top portion 13 of the main body portion 12, and an arcuate portion 43b that continues to the rectilinear portion 43a and curves inward. Is formed. Note that the pair of sensor portions 33 and 43 can be formed so that the rectilinear portions 33a and 43a bulge slightly outward from the side surface of the main body portion 12 if necessary.
[0014]
For this reason, a pair of sensor part 33 and 43 becomes the arrangement | positioning relationship in which the open front end surfaces 35 and 45 of arc-shaped part 33b and 43b face each other. In addition, contact open inclined surfaces 36 and 46 are formed on the open front end surfaces 35 and 45, respectively, so as to be provided with an inclination that can automatically engage with each other in the front-rear direction in FIG.
[0015]
Further, the pair of sensor portions 33 and 43 include support shaft portions 38 and 48 on the base end portions 37 and 47 side, to which the first gears 39 and 49 are fixed in an arrangement relationship orthogonal to the axial direction. The main body 12 is pivotally supported on the main body 12 side so as to be freely rotatable.
[0016]
On the other hand, a pair of opening operation portions 14 and 15 are disposed in the main body portion 12 under an individual correspondence relationship between one sensor portion 33 and the other sensor portion 43. That is, in the main body part 12, one opening operation part 14 for operating the left sensor part 33 in FIG. 1A is provided, and the other opening operation part 15 for operating the right sensor part 43 is provided. Are arranged in pairs.
[0017]
These opening operation portions 14 and 15 have proximal end shaft support portions 16 and 17 at their base portions, and are provided with pressing protrusion portions 18 and 19 that protrude inwardly at the distal end side, via spring materials (not shown). Thus, each of them is pivotally supported on the main body portion 12 in the form of an operating lever under a state in which it is always urged outward (in the left and right outer directions).
[0018]
Further, second gears 22 and 23 meshing with the corresponding first gears 39 and 49 are respectively provided on the side where the projecting ends 18a and 19a of the pressing projections 18 and 19 are located in the main body 12. The supporting shaft portions 20 and 21 fixed under the arrangement relationship orthogonal to the direction are axially supported so as to be freely rotatable. In this case, if the first gears 39 and 49 are formed to have a smaller diameter than the second gears 24 and 25, a small movement on the second gears 24 and 25 side causes a large movement on the first gears 39 and 49 side. That is, the one sensor unit 33 and the other sensor unit 43 can be forcibly rotated separately at a large rotation angle.
[0019]
Further, the support shafts 20 and 21 are respectively provided with projecting pieces 22 and 23 that come into contact with the projecting ends 18a and 19a of the pressing projecting portions 18 and 19 in a direction perpendicular to the axial direction. In this case, as shown in FIG. 1 (a), the arrangement of the support shafts 20 and 21 and the pressing projections 18 and 19 is provided on the front side of the support shaft 20 located on the left side. The projecting piece 22 and the projecting end 18a of the pressing projecting portion 18 are in contact with each other, and the support shaft portion 21 located on the right side is in contact with the projecting piece 23 provided on the back side and the projecting end 19a of the projecting portion 19 for pressing. It is arranged. For this reason, when the support shafts 20 and 21 are forcibly rotated, the second gears 24 and 25 are rotated counterclockwise.
[0020]
In addition, spring members 26 and 27 to which a substantially equivalent spring force that can always urge the rotational force only in one direction, such as a torsion coil spring, is interposed in the support shaft portions 20 and 21. In addition, a rotational force by a substantially equivalent force is always urged to the support shaft portions 20 and 21 through these spring members 26 and 27 in the clockwise direction which is a predetermined shaft rotation direction.
[0021]
That is, the spring material 26 passes through the support shaft portion 20 → the second gear 22 → the first gear 39 → the support shaft portion 38, and thereby the contact inclined surface 36 of one sensor portion 33 is shown in FIG. The urging force toward the back of the is given. Further, the spring material 27 passes through the support shaft portion 21 → the second gear 25 → the first gear 49 → the support shaft portion 48, so that the spring member 27 is in contact with the contact inclined surface 46 of the other sensor portion 43 in FIG. The urging force toward the front of is given.
[0022]
For this reason, the pair of sensor portions 33 and 43 are in a normally closed state in which they are engaged with each other via the contact inclined surfaces 36 and 46 provided on the open front end surfaces 35 and 45, respectively. ) Can be automatically closed as shown in FIG.
[0023]
Next, the operation and effect of the invention having the above-described configuration will be described based on the illustrated example. When the measurement operator simultaneously presses the opening operation portions 14 and 15 inward, the support shaft portion in FIG. 20 and the support shaft portion 21 are subjected to a forced axial rotation force in the counterclockwise direction which is opposite to the urging direction of the spring members 26 and 27.
[0024]
As a result, the support shaft portion 20 side passes through the second gear 22 → the first gear 39 → support shaft portion 38 and the one sensor portion 33 is directed forward, and the support shaft portion 21 side is the second gear 25 → As shown in FIGS. 2 (a), 2 (b), and 2 (c), the other sensor portion 43 is axially rotated in the rear direction through the first gear 49 → the support shaft portion 48. Can be forcibly released.
[0025]
For this reason, for example, as shown in FIG. 3 (a), when measuring the conductor L to be measured surrounded by the obstacle W, it is compulsory as long as the introduction space for the substantially horizontal width of the instrument body 12 in the left-right direction can be secured. It is possible to smoothly feed the pair of sensor portions 33 and 43 opened by rotating the shaft in the direction of the conductor L to be measured.
[0026]
After the both sensor parts 33 and 43 are sent in the direction of the conductor L to be measured surrounded by the obstacle W, the spring members 26 and 27 are immediately released by simultaneously releasing the pressing force on the pair of opening operation parts 14 and 15. A clockwise rotational force that returns to the original position direction is applied to the support shaft portions 20 and 21 through the support shaft portions 20 and 21.
[0027]
As a result, the pair of sensor portions 33 and 43 are axially rotated in the normally closed direction while surrounding the conductor L to be measured, and the contact inclined surfaces 36 and 46 are engaged with each other as shown in FIG. By being closed, the clamp sensor 32 is formed and measurement work can be started.
[0028]
Accordingly, even when the conductor L to be measured is located in a relatively narrow place, the pair of sensor portions 33 and 43 can be sent and clamped in the open state, so that the measurable range can be increased. The measurement work can be carried out smoothly by expanding it.
[0029]
After the necessary measurement work is completed, the pair of opening operation portions 14 and 15 are pressed again to forcibly open one sensor portion 33 and the other sensor portion 43, and then the conductor L to be measured is opened. It can be easily pulled out from the side.
[0030]
Moreover, according to the example shown in FIG. 1, not only the sensor units 33 and 43 but also the pair of opening operation units 14 and 15 are arranged on the main body unit 12 with the same structure in a symmetrical relationship. Therefore, it is possible to effectively reduce the member cost and contribute to the reduction of the product cost.
[0031]
The above has been a description of preferred examples of the present invention based on the illustrated examples, and the specific contents thereof are not limited thereto. For example, in the illustrated example, a pair of sensor units 33 and 43 having a structure in which the axes are forcibly rotated in opposite directions are shown, but the axes can be forcibly rotated in the same direction. You can also keep it.
[0032]
[0033]
Further , according to the illustrated example, a structure is shown in which the pair of sensor portions 33 and 43 are automatically engaged via the contact inclined surfaces 36 and 46 provided on the respective open front end surfaces 35 and 45. However, the open front end surfaces 35 and 45 only need to be in a positional relationship that faces each other when they are closed, and a structure that simply faces each other in a non-contact state or a structure that engages with each other via an uneven portion. Can also be adopted.
[0034]
On the other hand, in the present invention, among the pair of sensor parts 33 and 43 shown in FIG. 1A, for example, one sensor part 43 located on the right side is formed as a driving side as shown in the figure so as to be freely movable, Also included is a double-open structure formed by following the movement of the other sensor portion 33 positioned on the one sensor portion 43 side.
[0035]
In this case, according to the example shown in FIG. 4, the driving-side sensor portion 43 located on the right side has the support shaft portion 48 to which the first gear 49 is fixed in an arrangement relationship orthogonal to the axial direction as the base end portion. It is provided on the 47 side and is pivotally supported on the main body 12 side so as to be rotatable.
[0036]
Further, an opening operation portion 15 for operating the right sensor portion 43 is disposed in the main body portion 12. On the side where the protruding end 19 a of the pressing protrusion portion 19 is located, a first gear 49 and A support shaft portion 21 to which the meshing second gear 23 is fixed in an arrangement relationship orthogonal to the axial direction is rotatably supported.
[0037]
In addition, a spring material 27 is interposed in the support shaft portion 21, and a rotational force that is always directed in a predetermined axial rotation direction is urged to the support shaft portion 21 via the spring material 27.
[0038]
Further, the sensor part 33 located on the left side and the sensor part 43 located on the right side include pulleys 52 and 53 respectively fixed to the respective support shaft parts 38 and 48, and the pulleys 52 and 53 are mutually connected. The shaft rotational force on the sensor unit 43 side can be transmitted to the sensor unit 33 on the driven side via a belt 54 that is interposed therebetween.
[0039]
For this reason, by pressing the opening operation unit 15, the pair of sensor units 33 and 43 can be rotated in the opposite direction or in the same direction to be in the open state, and the pressing force on the opening operation unit 15 is released. Thus, the spring member 27 can be automatically closed by the urging force of the spring member 27.
[0040]
On the other hand, according to the example shown in FIG. 5, the driving-side sensor unit 43 located on the right side includes the support shaft portion 48 to which the first gear 49 is fixed in an arrangement relationship orthogonal to the axial direction, and the base end portion 47. It is provided on the side and is pivotally supported on the main body 12 side so as to be rotatable.
[0041]
Further, the main body portion 12 is provided with an opening operation portion 15 for operating the right sensor portion 43 as a lever portion 55, and the sensor portion is pressed by pressing the protruding operation portion 56 with a finger. 43 support shaft portions 48 can be forcibly rotated.
[0042]
In addition, in the vicinity of the support shaft portion 48, the support shaft portion 21 to which the second gear 23 meshing with the first gear 49 is fixed is rotatably supported, and the support shaft is supported by the interposed spring material 27. A rotational force is always applied to the portion 21 in a predetermined axial rotation direction.
[0043]
Further, the sensor part 33 located on the left side and the sensor part 43 located on the right side include pulleys 52 and 53 respectively fixed to the respective support shaft parts 38 and 48, and the pulleys 52 and 53 are mutually connected. The shaft rotational force on the sensor unit 43 side can be transmitted to the sensor unit 33 on the driven side via a belt 54 that is interposed therebetween.
[0044]
For this reason, by pressing the protrusion operation part 56 of the lever part 55 with a finger and forcibly rotating the support shaft part 48 of the sensor part 43, the pair of sensor parts 33 and 43 rotate in the opposite direction or in the same direction. The opening state can be released, and the pressing force applied to the opening operation portion 15 can be released, so that the closing state can be automatically made by the urging force of the spring material 27.
[0045]
Therefore, according to the example of FIG. 4 and FIG. 5, the driving-side sensor unit 43 and the driven-side sensor unit 33 can be axially rotated in the opening direction simply by operating the opening operation unit 15. .
[0046]
In the case of the example shown in FIGS. 4 and 5, the shaft rotational force transmission mechanism is constituted by pulleys 52, 53 and a belt 54, but other shaft rotations such as a combination of a chain and a gear train. It is also possible to freely perform synchronized forced rotation of the sensor unit 33 on the driven side through a force transmission mechanism. In FIG. 5, the opening operation portion 15 is formed by the lever portion 55, but this is formed in a dial shape, and by forcibly rotating it, the movable side sensor portion can be rotated in the opening direction. It can also be made possible.
[0047]
Further, the sensor unit 33, 43 of a pair, in order to freely position regulation closed position and / or open position with the main body portion, by attaching a suitable stopper for restricting the movement of the opening operation portion For example, it is possible to prevent the movable-side sensor unit from moving in the closing direction or the opening direction more than necessary.
[0048]
In the illustrated example, the case where the present invention is applied to a clamp-type ammeter is shown. However, if desired, for example, a pair of clamp sensors that can be freely opened and closed is attached to the main body to constitute the present invention and separately prepared. It can also be made to be connectable to a measuring device to be connected via a cord.
[0049]
【Effect of the invention】
As described above, according to the present invention, as long as an introduction space corresponding to the substantially horizontal width of the main body portion can be secured, both sensor portions can be fed in the direction of the measured conductor under the open state. Even when it is located in a relatively narrow place, it is possible to smoothly perform the measurement work by extending the measurable range accordingly.
[Brief description of the drawings]
FIG. 1 shows an example of the present invention applied to a clamp-type ammeter, of which (a) is a front view with a part cut away, (b) is a right side view, and (c). Respectively show plan views.
FIG. 2 shows a state when the example shown in FIG. 1 is opened, in which (a) is a front view, (b) is a right side view, and (c) is a plan view. Show.
3 is a front view showing a state at the time of measurement work using the example shown in FIG. 1, in which (a) shows a state at the time of feeding or pulling out a conductor to be measured, and (b) shows a state under measurement. Each state when the conductor is clamped is shown.
FIG. 4 is a front view of a principal part with a part cut away, showing another example of the present invention applied to a clamp-type ammeter.
FIG. 5 is a front view of a principal part with a part cut away, showing still another example of the present invention applied to a clamp-type ammeter.
FIG. 6 is a front view showing an example of a conventional clamp-type ammeter.
7 is a front view showing a state during measurement using the clamp-type ammeter shown in FIG. 6, in which (a) shows a state when a sufficient introduction space for a conductor to be measured is secured, (B) shows a state when the introduction space is substantially equal to the lateral width of the clamp-type ammeter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Clamp type ammeter 2 Instrument main body 3 Opening / closing operation lever 4 Clamp sensor 5 Left side clamp part 6 Left side holder 7 Right side clamp part 8 Right side holder 11 Clamp type ammeter 12 Main body part 13 Top part 14, 15 Opening operation part 16, 17 Base end Shaft support 18, 19 Pressing protrusion 18a, 19a Protruding end 20, 21 Supporting shaft 22, 23 Protruding piece 24, 25 Second gear 26, 27 Spring material 32 Clamp sensor 33 Sensor 33a Straight running part 33b Arc-shaped part 34 One side Holder 35 Open tip surface 36 Abutting inclined surface 37 Base end portion 38 Support shaft portion 39 First gear 43 Sensor portion 43a Straight running portion 43b Arc portion 44 One side holder 45 Open tip surface 46 Abutting inclined surface 47 Base end portion 48 Support Shaft part 49 First gear 52, 53 Pulley 54 Belt 55 Lever part 56 Projection operation part L Measured conductor W obstacle Thing

Claims (3)

It is a double-open type clamp sensor comprising a pair of sensor parts attached to be openable and closable with both sides movable in the width direction of the main body part,
The sensor part is pivotally supported on the main body part side through a support shaft part fixed to each base end part side so as to be freely rotatable.
The opening operation portion disposed in the main body portion is configured such that the sensor portions are automatically formed in a normally closed state between the sensor portions when not operated and the main shaft portions are forcedly rotated during operation. And freely applying a forcefully releasing force in a normally closed state at a position within the horizontal width of the part ,
An opening / closing mechanism for a clamp sensor, wherein the pair of sensor portions has a mutual maximum width substantially equal to a lateral width of the main body when closed . The clamp sensor opening and closing mechanism according to claim 1, wherein the pair of sensor portions are in a positional relationship in which the open front end surfaces face each other when closed. The clamp sensor opening / closing mechanism according to claim 1 or 2, wherein the pair of sensor portions are freely arranged between the main body portion and a closed position and / or an open position.

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