JP4339566B2 - Clamp sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a lock for maintaining a closed state of a pair of clamp portions that are freely openable and closable by biasing them in a normally closed direction and forcibly opening them through an operation lever. This is a technique related to a clamp sensor provided with a mechanism to prevent forced opening.
[0002]
[Prior art]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-102229
Patent Document 1 discloses an installation-type clamp that can clamp a conductor to be measured. In order to ensure a clamped state at the time of current measurement, the closed state is surely secured via a connecting metal fitting. It can be locked.
[0004]
On the other hand, FIG. 6 is different from the installation type clamp sensor having a complicated structure as disclosed in Patent Document 1, in which a sensor unit is accommodated in a case integrally formed as a resin molded product. It is a perspective view which shows an example of the installation type clamp sensor which consists of simple structures.
[0005]
According to the figure, an installation-type clamp sensor 1 includes a one-side clamp part 2 and an other-side clamp part 5 connected to the one-side clamp part 2 via a hinge part 7 made of a resin material so as to be opened and closed. And is formed.
[0006]
Further, when measuring the current with the conductor to be measured clamped, the resin hook piece 6 provided on the other side clamp portion 5 is engaged with the hook piece 3 integrally formed on the one side clamp portion 2 side, and the closed state is set. It can be locked.
[0007]
[Problems to be solved by the invention]
However, although the clamp sensor having a relatively large and complicated structure including the installation type clamp sensor disclosed in Patent Document 1 can complete the locked state at the time of closing, There is an inconvenience that the lock-related operation becomes complicated because it is necessary to perform the release or to perform the lock and the release using a separately prepared tool.
[0008]
On the other hand, the installation-type clamp sensor 1 shown in FIG. 6 has a simplified locking mechanism, so that it is relatively easy to release the lock, so that there is a problem that it is difficult to ensure a secure locked state. there were.
[0009]
SUMMARY OF THE INVENTION In view of the above-mentioned problems observed in a clamp sensor including a conventional installation type, the present invention stably maintains the closed state of a pair of clamp portions that can be opened and closed under a lock mechanism that is easy to operate. An object of the present invention is to provide a clamp sensor that can be used.
[0010]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems, and a main body in which a pair of freely openable and closable clamps are urged in a normally closing direction and forcedly opened through an operation lever. The portion includes at least a pair of outer case portions that face each other, and one case portion of these outer case portions is arranged on the outer surface side so as to freely advance and retreat in the direction between the base end portions of each clamp portion. An operating piece provided, a driven piece connected to the operating piece and driven on the inner surface thereof, and attached to the driven piece and formed between the base end portions of the clamp portions when closed. A locking mechanism comprising an opening blocking piece introduced into the gap, and the follower piece controls at least the maintenance and release of the predetermined position at the time of its most advanced advance, so that the inside of the gap at the time of closing is controlled. The position that restricts the forced push-back of the opening blocking piece The clamp sensor comprising includes a determining unit, wherein the opening preventing piece includes a horizontal plate portion disposed on the driven piece, of the open ends of the horizontal piece portion into the gap at the time of closing of the clamping portions Dimensional error in the gap width of each clamp part formed by a pair of support arm parts that are provided with a parallel separation width that allows entry, and elastically deformed freely. It has a structural feature in that it is absorbed into the gap .
[0011]
[0012]
In this case, between these support arm portions mutually, preferably keep with intervening excessive deformation inhibiting piece arresting its excessive deformation.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view showing an example of the present invention, and FIG. 2 is an explanatory view showing a part of FIG.
[0014]
According to these drawings, the entire clamp sensor 11 is provided with a main body that can freely bias a pair of clamp portions 42 and 43 that can be opened and closed in a normally closing direction and a forced opening via the operation levers 32 and 32. It is formed in the portion 12.
[0015]
Moreover, the main body 12 can be artificially fed into the gap 50 formed between the base end portions 44 and 45 of the clamp portions 42 and 43 at the time of closing so as to prevent forced opening at the time of closing. And a locking mechanism 19 having an opening blocking piece 29 formed on the surface.
[0016]
That is, the main body portion 12 is formed between a pair of outer case portions 13 and 14 made of an insulating resin material having shapes that face each other and the combined outer case portions 13 and 14. The space 18 is formed by incorporating necessary members such as the circuit board 61 shown in FIG.
[0017]
Further, one outer case portion 13 located on the upper side in FIG. 2 is disposed on the outer surface 15 side so as to freely advance and retreat in the direction between the base end portions 44 and 45 of the clamp portions 42 and 43. The operating piece 20, the driven piece 23 connected to the operating piece 20 and driven on the inner surface 16 side thereof, attached to the driven piece 23, and the base end portions of the clamp portions 42, 43 when closed A locking mechanism 19 is provided which is composed at least of an opening blocking piece 29 introduced into a gap 50 formed between 44 and 45. The operation piece 20 includes a stopper 21 erected on the distal end side thereof, and a ridge portion 22 that is bulged on the surface near the base end to prevent slipping.
[0018]
In this case, the lock mechanism 19 is positioned on the operation piece 20 that slides in the recess 15 a on the outer surface 15 side of the outer case portion 13, and is fixed on the operation piece 20 side with the screw 28 arranged on the inner surface 16 side. A substantially U-shape is provided with a driven piece 23 and a pair of support arm portions 30 , 30 attached so as to protrude from both open ends of a horizontal piece portion 29 a disposed on the distal end 24 side of the driven piece 23. an opening preventing piece 29 that Teisu, is formed and a excessive deformation inhibiting piece 31 having a substantially T-shape interposed integrally as the horizontal portion 31a located between support arm portion 30, 30 each other Yes.
[0019]
Moreover, the pair of support arms 30 and 30 are provided with a parallel separation width that can easily enter the gap 50 formed between the base end portions 44 and 45 of the clamp portions 42 and 43 when closed. In addition, when the operation levers 32 and 32 are opened, the base end portions 44 and 45 are provided with flexibility so that they can be elastically deformed to some extent when they receive a pressing force when they move in the approaching direction. ing. In addition, the pair of support arms 30 and 30 can be elastically deformed in this manner, so that even if the width of the gap 50 varies, the dimensional error can be absorbed and the gap 50 can be easily formed. You can get inside.
[0020]
Further, the over-deformation restraining piece 31 has a horizontal portion 31a that abuts when the pair of support arm portions 30 and 30 are bent and deforms to keep the deformation limit within a certain range. Over-deformation can be suppressed.
[0021]
Further, the driven piece 23 is formed with positioning portions 25 that are positioned in relation to the engaging portion 27 disposed on the inner surface 16 of the outer case 13 on both sides in the advancing and retreating direction. Explaining this in accordance with the illustrated example, both sides of the follower piece 23 are provided with protrusions 26 provided with elasticity, and these protrusions 26 are provided on the engagement part 27. The base-side concave portion 27a and the distal-side concave portion 27b are in a disposition relationship in which they can be engaged with each other. Therefore, the follower piece 23 (operation piece 20) when the lock operation is not performed is positioned by engaging each protrusion 26 with the proximal end side recess 27a, and the follower piece 23 (operation piece 20) at the time of the lock operation. The protrusions 26 are positioned by engaging with the front end side recesses 27b.
[0022]
The operation levers 32 and 32 are pivotally supported at their respective base end portions 33 via a support shaft 34, and the distal end abutting portions 35 are respectively outside the base end portions 44 and 45 of the clamp portions 42 and 43. Are arranged separately on the left and right of the inner case 17 side of the outer case portion 14 located on the lower side.
[0023]
On the other hand, the pair of clamp portions 42 and 43 are supported by a compression coil spring 51 that has base end portions 44 and 45 pivotally supported via support shafts 48 and 49 and is disposed between the base end portions 44 and 45. The main body 12 is disposed in a state of being biased in the normally closed direction.
[0024]
In this case, the respective base end portions 44 and 45 are arranged in an arrangement relationship in which a gap 50 having a predetermined width is formed when the base end portions 44 and 45 are closed. In order to smoothly introduce the arm portions 30 and 30), the lower end facing surfaces 44a and 45b are formed with guide inclined surfaces 46 and 47 formed so that the distance between the lower end facing surfaces 44a and 45b is slightly enlarged.
[0025]
Next, the operation and effect of the present invention having the above-described configuration will be described. As shown in FIG. 1, the clamp sensor 11 when not in use is normally closed by the urging force of the compression coil spring 51. The lock mechanism 19 is also unlocked as shown in FIG.
[0026]
When trying to clamp a conductor to be measured (not shown) using the clamp sensor 11, the operation levers 32 and 32 are pressed with fingers as shown in FIG. By pushing inward separately while abutting the base end portions 44 and 45, the clamp portions 42 and 43 are pushed open against the urging force of the compression coil spring 51, and the clamp portions 42 and 43 are opened through the secured free space. Introduce the conductor to be measured inward.
[0027]
After the clamping operation for the conductor to be measured is completed, the clamp portions 42 and 43 are automatically closed by the urging force of the compression coil spring 51 if the pressing force of the fingers on the operation levers 32 and 32 is released.
[0028]
Thereafter, the operating piece 20 constituting the lock mechanism 19 is slid so as to be pushed up toward the clamp portions 42 and 43 while applying a finger to the ridge portion 22 so that the driven piece 23 is also moved in the same direction. To do.
[0029]
The follower piece 23 is provided with a pair of support arm portions 30 and 30 attached so as to protrude from both open ends of the horizontal piece portion 29a disposed on the tip 24 side thereof, and is an opening blocking piece having a substantially U shape. 29 , the pair of support arm portions 30, 30 follow the movement of the operation piece 20 in the gap 50 formed between the base end portions 44, 45 of the clamp portions 42, 43. The opening prevention piece 29 is also smoothly introduced while being guided by 46 and 47.
[0030]
When the opening blocking piece 29 is introduced to a predetermined position in the gap 50, the protrusion 26 provided in the positioning portion 25 of the driven piece 23 engages with the distal end side recess 27 b provided in the engaging portion 27. Therefore, the movement becomes difficult, and the closed state is locked as shown in FIGS.
[0031]
For this reason, even if the operation levers 32 and 32 are pressed strongly in this state, the pair of support arm portions 30 and 30 that constitute the opening prevention piece 29 is in contact with the horizontal portion 31a of the over-deformation prevention piece 31. As a result of the contact being prevented from being deformed more than necessary and the forced push-back from the gap 50 being restricted, the locked state at the time of closing can be made more reliable, and the support arm 30 can be locked at the time of locking. It is possible to reliably avoid side deformation.
[0032]
To release the lock after the measurement work on the conductor to be measured is completed, the operation piece 20 constituting the lock mechanism 19 is slid so as to be pulled down in the opposite direction, so that the driven piece 23 is also connected to the projection 26 of the positioning portion 25. This can be easily performed by moving the engagement portion 27 while releasing the engagement state with the distal end side concave portion 27 b and pulling the opening blocking piece 29 away from the gap 50.
[0033]
By pulling down the operation piece 20 to the initial position, the projection 26 of the positioning portion 25 of the driven piece 23 engages with the proximal-side concave portion 27a of the engagement portion 27, so that the unlocked state is stably maintained. Can be made.
[0034]
Thereafter, by pressing the operating levers 32, 32, the clamp portions 42, 43 can be pushed open against the urging force of the compression coil spring 51, and outward through the free space secured thereby. The conductor to be measured can be led out and the measurement work can be completed.
[0035]
The embodiment of the present invention has been described with reference to the illustrated example, and the specific embodiment is not limited to this. For example, the lock mechanism 19 can be artificially fed into the gap 50 formed between the base end portions 44 and 45 of the clamp portions 42 and 43 at the time of closing so as to prevent forced opening at the time of closing. It is only necessary to have an appropriately-shaped opening blocking piece formed on the body. For example, an opening blocking piece is attached to the distal end side of a lever (not shown) arranged to be raised and lowered on the body 12 side, and the lever is mounted on the body. The opening blocking piece may be lifted when pushed into the portion side, and the opening blocking piece may enter the gap 50 between the base end portions 44 and 45 when the lever is pulled up.
[0036]
Further, the driven piece 23 only needs to have a positioning portion that can freely maintain and release a predetermined position at least when it is most advanced (closed), and therefore, the engagement portion 27 has a proximal-side concave portion 27a. It is also possible to provide only the front-end-side recess 27b without providing. Furthermore, the structure of the positioning part 25 is not limited to the illustrated example, and a structure having an appropriate known structure such as being provided on the operation part 20 side can be selectively employed. Further, the biasing force in the normally closed direction with respect to the pair of clamp portions 42 and 43 may be provided by a spring material other than the compression coil spring 51.
[0037]
【The invention's effect】
As described above, according to the present invention, it is possible to reliably perform locking and releasing only by a simple slide operation with fingers, so that it is effective not only as a stationary type but also as a portable clamp sensor that can be carried around. Can be used.
[0038]
In addition, since the lock in the closed state can be released and released with a single touch, the measurement work can be entered quickly even for different conductors to be measured, which can be used to improve the efficiency of the field work.
[0039]
In addition, the pair of support arms constituting the opening blocking piece is provided with a parallel separation width that can easily enter into the gap formed between the base ends of each clamp portion when closed, and When the operation lever is opened, the base end portions are provided with flexibility so that they can be elastically deformed to some extent when they are subjected to a pressing force when they move in the approaching direction. Even if there is a variation, it is possible to absorb the dimensional error and easily enter the gap. As a result the locking mechanism when that have the excessive deformation inhibiting piece, which even if the operation lever when the lock is pressed, the excessive deformation inhibiting piece and deformation unnecessarily in contact is blocked, the air gap The forced pushing back from the inside can be prevented to make the locked state at the time of closing more reliable, and further, the deformation breakage of the pair of support arms can be surely suppressed.
[Brief description of the drawings]
FIG. 1 is an external plan view showing an example of the present invention.
FIG. 2 is an explanatory view showing the example of FIG. 1 with a part cut away;
FIG. 3 is an explanatory view showing the open state of the example of FIG. 1 with a part cut away;
4 is an explanatory view showing a locked state at the closing time together with an enlarged view of a main part in the example of FIG. 1; FIG.
5 is a longitudinal sectional view in the direction of arrows AA in FIG. 4;
FIG. 6 is a perspective view showing an example of a conventional installation type clamp sensor.
[Explanation of symbols]
11 Clamp sensor 12 Body portion 13, 14 Outer case portion 15 Outer surface 15 Recessed portion a
16, 17 Inner surface 18 Space part 19 Lock mechanism 20 Operation piece 21 Stopper 22 Ridge part 23 Driven piece 24 Tip 25 Positioning part 26 Projection part 27 Engagement part 27a Base side side concave part 27b Tip side concave part 28 Screw 29 Opening prevention piece
29a horizontal piece portion 30 support arm portion 31 over-deformation prevention piece 31a horizontal portion 32 operation lever 33 base end portion 34 support shaft 35 tip contact portion 42, 43 clamp portion 44, 45 base end portion 44a, 45a lower end facing surface 46, 47 Guide slope 48, 49 Support shaft 50 Gap 51 Compression coil spring 61 Circuit board

Claims (2)

The main body portion that is freely arranged to bias the pair of openable and closable clamp portions in the normally closed direction and the forced opening through the operation lever includes at least a pair of outer case portions that face each other. One of the outer case portions includes an operation piece disposed on the outer surface side so as to freely advance and retreat in the direction between the proximal ends of the clamp portions, and an inner surface connected to the operation piece. A locking mechanism comprising: a driven piece that is driven on the side; and an opening blocking piece that is attached to the driven piece and that is introduced into a gap formed between the base end portions of each clamp portion when the driven piece is closed. The driven piece includes a positioning portion that controls at least the maintenance and release of the predetermined position at the time of its most advanced advance and restricts the forced pushing back of the opening blocking piece from the inside of the gap at the time of closing. In the clamp sensor
The opening blocking piece has a horizontal piece portion disposed on the driven piece and a parallel separation width that allows the open pieces of the horizontal piece portion to enter the gap when the clamp portions are closed. It is formed with a pair of supporting arm portions that are provided and elastically deformed freely, and by elastically deforming these supporting arm portions, a dimensional error in the gap width of each clamp portion is absorbed and entered into the gap. A clamp sensor characterized by the above . 2. The clamp sensor according to claim 1, wherein an over-deformation restraining piece for inhibiting over-deformation of the support arms is interposed between the pair of support arms .

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