JP2012238507A - Measurement terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measurement terminal which is easily and securely attached to a head part of a screw of an apparatus that is a measuring object.SOLUTION: A measurement terminal 1 is used for a measuring apparatus 10 measuring current, voltage, electric power and the like and is detachably attached to a screw 14 connecting a cable 13 with an apparatus 11 that is a measuring object. The measurement terminal 1 includes: an attachment part 2 which is attached so as to enclose a head part 15 of the screw 14 and deforms so as to expand and contract; lead wire connection parts 3 integrally provided with the attachment part 2 and with which a lead wire 6, electrically connecting the attachment part 2 with the measuring apparatus 10, connects; and a pressing part 5 which is integrally provided with the attachment part 2 and presses the attachment part 2 between itself and the lead wire connection part 3 thereby deforming the attachment part 2 in the direction that the attachment part 2 expands.

Description

  The present invention relates to a measurement terminal, and more particularly to a measurement terminal for electrically connecting a measuring instrument for measuring current, voltage, power, etc. of a device such as a breaker to a measurement target device.

  In general, when measuring the current, voltage, power, etc. of a device such as a breaker with a measuring instrument, attach the measuring terminal of the measuring instrument (for example, an alligator clip) to the head of the screw that connects the cable to the measuring target device. However, since only a slight gap is provided between the body of the device to be measured and the screw head, it takes much time to attach the alligator clip to the screw head.

  In addition, when the alligator clip is attached to the screw head, the contact area of the alligator clip with the screw head is small, so the alligator clip is easy to come off from the screw head and the contact resistance increases. Problems arise. Furthermore, the alligator clip comes off from the screw head during measurement, causing various accidents.

  In order to cope with the above problems, Patent Document 1 discloses a pair of clips that can be opened and closed, a spring that biases the clip in a closing direction, a pressing plate that opens and closes the clip, and one clip. A terminal having a hammer made of a conductor connected to a measuring instrument and a spring for biasing the hammer toward the other clip has been proposed.

  According to the terminal described in Patent Document 1, a cable of a measurement target device (breaker or the like) is sandwiched between clips, a hammer is brought into contact with a screw of a terminal block of the measurement target device, and the tip of the other clip is connected to the measurement target device side. By making contact with the body, the hammer on the measuring instrument side can be electrically connected to the device to be measured.

  Patent Document 2 discloses a pair of grip pieces that can be opened and closed, a spring that biases both grip pieces in a closing direction, and a conductive material that is provided on one grip piece and connected to a measuring instrument. An instrument measuring clip with a coupling piece made of

  According to the measurement clip for instruments described in Patent Document 2, the coupling piece is brought into contact with the head of the screw of the terminal of the measurement target device (breaker or the like), and the other clip piece is locked to the partition wall on the measurement target device side. Thus, a screw can be sandwiched between the coupling piece and the other clip piece, and the engagement piece on the measuring instrument side can be electrically connected to the measurement target device.

JP 11-31546 A JP 2005-294071 A

  However, in the terminal described in Patent Document 1, depending on the type of measurement target device, the gap between adjacent cables is formed narrow, so that the cable cannot be sandwiched between clips, and the tip of the hammer is connected to the measurement target device. The screw head cannot be touched.

  Even if the cable is applied to a type of device that can be sandwiched between clips, the contact area with the screw head of the hammer is small, so that the contact resistance may increase. Furthermore, when measurement is continuously performed over a long time, measurement data may be interrupted due to accumulation of dust or the like.

  Furthermore, in the measuring clip for instruments described in Patent Document 2, since the screw is sandwiched between the coupling piece and the other clip piece, the coupling piece is easily detached from the screw. Further, since the contact area of the coupling piece with the screw is small, the contact resistance may increase. Furthermore, when measurement is continuously performed over a long time, measurement data may be interrupted due to accumulation of dust or the like.

  The present invention has been made in view of the conventional problems as described above, and can be easily attached to the head of a screw that connects a cable to a measurement target device regardless of the type of the measurement target device. It is an object of the present invention to provide a measurement terminal that does not come off from the screw head during measurement and can have a large contact area with the screw head.

In order to solve the above problems, the present invention employs the following means.
That is, the present invention is a measurement terminal that is used in a measuring instrument that measures current, voltage, power, etc., and is detachably attached to a screw that connects a cable to a measurement target device, and surrounds the head of the screw. A mounting portion that can be expanded and contracted, a lead wire connecting portion that is provided integrally with the mounting portion, and that is connected to a lead wire that electrically connects the mounting portion to the measuring instrument, and the mounting And a pressing portion that is deformed in a direction of expanding the mounting portion by pressing the mounting portion between the lead wire connecting portion and the lead wire connecting portion.

  According to the measurement terminal of the present invention, for example, the pressing portion is brought into contact with the body of the measurement target device, the lead wire connecting portion is pushed up in the direction of the pressing portion, and the mounting portion is interposed between the pressing portion and the lead wire connecting portion. By pressing, the mounting portion can be deformed in the expanding direction, and the head of the screw of the measurement target device can be inserted inside the mounting portion. In this state, by releasing the pressure, the mounting portion is deformed in a direction of contraction by its own elastic force, the inner surface of the mounting portion is pressed against the peripheral surface of the screw head, and the mounting portion is the head of the screw. It is attached in a state of surrounding the part and tightening the head of the screw.

  Moreover, in this invention, the said attaching part, the said press part, and the said lead wire connection part are good also as being integrally formed by bending the strip | belt-shaped board | plate material which has spring elasticity.

  According to the measurement terminal of the present invention, the attachment portion, the pressing portion, and the lead wire connecting portion are integrally formed by bending a belt-like plate material having spring elasticity, and thus can be easily manufactured.

  Furthermore, in the present invention, the attachment portion may be formed in a substantially square ring shape or a substantially ring shape.

  According to the measurement terminal of the present invention, the mounting portion is formed in a substantially square ring shape or a substantially ring shape according to the shape of the screw head portion, so that the mounting portion can be mounted regardless of the shape of the screw head portion. The screw head can be attached in a state of surrounding the screw head and tightening the screw head.

  Furthermore, in the present invention, the lead wire connecting portion may be provided with a limiting member that limits the amount of expansion / contraction deformation of the attachment portion.

  According to the measurement terminal of the present invention, the lead wire connecting portion is provided with a limiting member that limits the amount of expansion / contraction deformation of the attachment portion, so the attachment portion can be expanded / contracted in the elastic deformation region, The mounting portion can be prevented from causing plastic deformation.

  Furthermore, in this invention, it is good also as an insulating cover which covers the said attaching part, the said press part, and the said lead wire connection part being provided.

  According to the measurement terminal of the present invention, since the attachment portion, the pressing portion, and the lead wire connection portion are covered with the insulating cover, an accident such as a short circuit during measurement can be prevented.

  As described above, according to the measurement terminal of the present invention, regardless of the type of the measurement target device, it can be easily and surely attached to the head of the screw that connects the cable to the measurement target device. Further, since the screw head does not come off during measurement, stable measurement can be performed.

It is the front view which showed the whole one Embodiment of the terminal for a measurement of this invention. It is a side view of the measurement terminal of FIG. It is the schematic which showed the connection procedure of the terminal for a measurement. It is the schematic which showed the modification of the terminal for a measurement.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of a measurement terminal according to the present invention. The measurement terminal 1 according to the present embodiment is used in, for example, a measuring instrument 10 that measures current, voltage, power, etc. of a device such as a breaker, and electrically connects the measuring device 10 to a measuring object device 11. It is effective.

  That is, the measurement terminal 1 according to the present embodiment includes an attaching / detaching portion 2 that can be deformed / expanded and attached to a head 15 of a screw 14 that connects a cable 13 to a measurement target device 11 as shown in FIGS. 1 and 2. The lead wire connecting portion 3 is provided integrally with the attachment portion 2 and connected to the lead wire 6 for electrically connecting the attachment portion 2 to the measuring instrument 10, and the lead wire is provided integrally with the attachment portion 2. A pressing portion 5 is provided that is deformed in a direction in which the mounting portion 2 is expanded by pressing the mounting portion 2 with the connection portion 3.

  The mounting portion 2, the lead wire connecting portion 3, and the pressing portion 5 are integrally formed by bending a belt-like plate material having spring elasticity into a desired shape. In this embodiment, the pressing portion 5 The portion 5 is formed in a pentagon shape, the attachment portion 2 is formed in an octagon shape, and the lead wire connecting portion 6 is formed in a strip shape.

  A boundary 20 between the pressing portion 5 and the mounting portion 2 is configured to intersect in an X shape. For example, a downward concave portion (not shown) is provided in the upper member, an upward concave portion (not shown) is provided in the lower member, and the two concave portions are engaged with each other to cross each other in an X shape. Thereby, the expansion / contraction deformation | transformation of the attaching part 2 can be accept | permitted.

  By forming the pressing portion 5 in a pentagonal shape and the mounting portion 2 in an octagonal shape, the lead wire connection is made with the tip of the pressing portion 5 in contact with the concave portion 17 of the body 12 of the measurement target device 11. By pressing the part 3 in the direction of the pressing part 5, the mounting part 2 can be pressed between the pressing part 5 and the lead wire connecting part 3, and the mounting part 2 can be deformed in a widening direction. Moreover, by releasing the pressing force in the direction of the pressing portion 5 of the lead wire connecting portion 3, the mounting portion 2 can be deformed in a direction to be contracted by its own elastic force.

  In the present embodiment, as shown in FIG. 3, when the mounting portion 2 is pressed between the pressing portion 5 and the lead wire connecting portion 3 and the mounting portion 2 is deformed in the expanding direction, the mounting portion 2. In such a direction that the pressing portion of the attachment portion 2 is released and the attachment portion 2 is contracted by its own elastic force so that the inner dimension of the attachment portion 2 becomes larger than the diameter of the head portion 15 of the screw 14 of the measurement target device 11. The size and bending angle of the pressing portion 5 and the mounting portion 2 are set so that the inner dimension of the mounting portion 2 becomes smaller than the diameter of the head portion 15 of the screw 14 when deformed.

  Accordingly, the head portion 15 of the screw 14 of the measurement target device 11 can be easily placed inside the attachment portion 2 by deforming the attachment portion 2 between the pressing portion 5 and the lead wire connection portion 3 so as to be expanded. Can be inserted. In addition, by releasing the pressed state and deforming the mounting portion 2 in a contracting direction, the mounting portion 2 is attached to the periphery of the head 15 of the screw 14 and the head 15 of the screw 14 is tightened. Can do.

In the present embodiment, the mounting portion 2 is formed in an octagonal shape, but the mounting portion 2 is not limited to an octagonal shape, and may be formed in various shapes such as other polygonal shapes and substantially circular shapes. The point is that the head portion 15 of the screw 14 is inserted inside the mounting portion 2 by enlarging and contracting the mounting portion 2, surrounds the head 15 of the mounting portion 2 screw 14, and the head portion of the screw 14. Any shape can be used as long as 15 can be tightened (substantially square ring, substantially ring ring, etc.).
In the present embodiment, the hexagon socket head cap screw of the screw 14 is used.

A restriction member 7 that restricts the amount of expansion / contraction deformation of the attachment portion 2 is attached to the pair of lead wire connection portions 3. The limiting member 7 includes a rod-shaped main body 8 that can be elastically deformed, and a locking nut 9 that is screwed to both ends of the main body 8. The body 8 is inserted into the mounting holes 4 of the lead wire connecting portions 3, both end portions are protruded from the lead wire connecting portions 3, and the locking nuts 9 are screwed into the protruded portions. A member 7 is attached between the lead wire connecting portions 3. By restricting the amount of expansion / contraction deformation of the attachment portion 2 by the limiting member 7, the attachment portion 2 can be expanded / contracted in the elastic deformation region, and the attachment portion 2 can be prevented from being plastically deformed.
The limiting member 7 is not limited to the one having the above configuration, and may be any member that has a function capable of limiting the amount of expansion / contraction deformation of the attachment portion 2.

  As shown in FIG. 4, an insulating cover 16 may be attached so as to cover the pressing part 5, the attaching part 2, and the lead wire connecting part 3. By attaching the insulating cover 16, it is possible to prevent accidents such as a short circuit during measurement. The insulating cover 16 is preferably formed of a transparent or translucent material. By forming the insulating cover 16 with a transparent or translucent material, it is possible to grasp the state of the pressing portion 5, the mounting portion 2, and the lead wire connecting portion 3 inside the insulating cover 16 from the outside of the insulating cover 16. Therefore, the screw 14 can be securely and safely attached to and removed from the head 15.

  And in order to attach the measurement terminal 1 of this Embodiment comprised as mentioned above to the head 15 of the screw 14 which connects the cable 13 to the measuring object apparatus 11, as shown to Fig.3 (a) first, For example, the measurement terminal 1 is arranged in front of the measurement target device 11.

  And as shown in FIG.3 (b), the press part 5 of the terminal 1 for a measurement is inserted in the concave part 17 of the body 12 of the measuring object apparatus 11, and it is made to contact the upper surface 17a of the concave part 17, and this By pressing the lead wire connecting portion 3 upward in the figure (in the direction of arrow A) in the state, the attaching portion 2 is pressed between the pressing portion 5 and the lead wire connecting portion 3 to expand the attaching portion 2 ( The inner dimension of the mounting portion 2 is enlarged by deforming in the direction of arrow B), and the head portion 15 of the screw 14 is inserted inside the mounting portion 2 in this state.

  Next, as shown in FIG. 3 (c), the pressing force to the lead wire connecting portion 3 is released, the pressing state of the mounting portion 2 is released, and the mounting portion 2 is contracted by its own elastic force ( The inner surface of the mounting portion 2 is brought into contact with the peripheral surface of the head 15 of the screw 14. As a result, the attachment portion 2 can be attached in a state of surrounding the head portion 15 of the screw 14 and the head portion 15 of the screw 14 being tightened, and the measurement terminal 1 of the measuring instrument 10 is connected to the measurement target device 11. It can be electrically connected to the head 15 of the screw 14.

  In the measurement terminal 1 of the present embodiment configured as described above, the measurement object is placed inside the attachment portion 2 by pressing the attachment portion 2 between the pressing portion 5 and the lead wire connection portion 3. The attachment part 2 can be attached to the head 15 of the screw 14 by inserting the head 15 of the screw 14 of the device 11 and releasing the pressure in this state.

  Therefore, regardless of the type of the measurement target device 11, the measurement terminal 1 can be easily and reliably attached to the head 15 of the screw 14 of the measurement target device 11, and the measurement terminal 1 and the lead wire 6 can be used. The measuring device 10 can be attached to the screw 14 on the measurement target device 11 side.

  Moreover, since the attachment part 2 can be attached so that the circumference | surroundings of the head 15 of the screw 14 of the measuring object apparatus 11 may be enclosed, and the head 15 of the screw 14 may be tightened, it is measuring current, voltage, electric power, etc. Therefore, the measurement terminal 1 is not detached from the head 15 of the screw 14, and current, voltage, power, etc. can be measured safely and reliably.

  Furthermore, since the contact area of the screw 14 of the mounting portion 2 with respect to the head 15 can be increased, the contact resistance does not increase, and when measurement is performed for a long time, dust etc. The measurement data is not interrupted by accumulation.

  Furthermore, since a single strip-shaped plate material is used as a material and the material is bent into a desired shape, the measurement terminal 1 including the pressing portion 5, the mounting portion 2, and the lead wire connecting portion 3 is formed. The measurement terminal 1 can be easily manufactured in a short time and at a low cost.

  In the above description, the measurement terminal 1 according to the present invention is applied to the head 15 of the hexagon socket head cap screw as the screw 14. However, a hexagon head bolt is used as the screw 14 and the head of the hexagon head bolt is used. You may attach the measurement terminal of this invention. In that case, the same effect is obtained.

DESCRIPTION OF SYMBOLS 1 Measurement terminal 2 Mounting part 3 Lead wire connection part 4 Mounting hole 5 Press part 6 Lead wire 7 Restriction member 8 Main body 9 Locking nut 10 Measuring instrument 11 Measuring object 12 Body 13 Cable 14 Screw 15 Head 16 Insulating cover 17 Concave part 17a Upper surface 20 Boundary

Claims (5)

It is a measuring terminal that is used in a measuring instrument that measures current, voltage, power, etc., and is detachably attached to a screw that connects a cable to a measurement target device,
A mounting portion that can be expanded and contracted so as to surround the head of the screw, and a lead that is provided integrally with the mounting portion and that is connected to a lead wire that electrically connects the mounting portion to the measuring instrument. A wire connecting portion and a pressing portion that is provided integrally with the attachment portion and that is deformed in a direction in which the attachment portion is expanded by pressing the attachment portion with the lead wire connection portion. Measuring terminal characterized by   The measurement terminal according to claim 1, wherein the attachment portion, the pressing portion, and the lead wire connecting portion are integrally formed by bending a belt-like plate material having spring elasticity.   The measurement terminal according to claim 1, wherein the attachment portion is formed in a substantially square ring shape or a substantially ring shape.   The measuring terminal according to any one of claims 1 to 3, wherein the lead wire connecting portion is provided with a limiting member for limiting an expansion / contraction deformation amount of the mounting portion.   The measurement terminal according to claim 1, further comprising an insulating cover that covers the attachment portion, the pressing portion, and the lead wire connection portion.

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