JP2011090882A - Crocodile clip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crocodile clip which is easy to handle and can maintain certainly contact with a head part of a connecting screw against vibration and impact etc. <P>SOLUTION: The crocodile clip is provided with a first clip member 2 which is connected to a measuring instrument side 31 and consists of a conductive member, a second clip member 3 which is installed opposed to the first clip member 2 and is coupled capable of rocking to the first clip member 2, an energizing means 5 which energizes the tip portion 2b of the first clip member 2 and the tip portion 3b of the second clip member 3 in a direction to approach mutually, and a clipping portion 6 which is formed by the tip portion 2b of the first clip member 2 and the tip portion 3b of the second clip member 3 and clips an insulating barrier rib 102 of a terminal board 100 by the energizing means 5. The tip portion 2b of the first clip member 2 contacts the head part of a connecting screw 103 of the terminal board 100 with the clipping portion 6 clipping the insulating barrier rib 102, and the tip portion 3b of the second clip member 3 is electrically connected to the head part of the other connecting screw 103 adjoining separated by the insulating barrier rib 102 with the clipping portion 6 clipping the insulating barrier rib 102. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook clip used for measuring an electric circuit, and more particularly to a hook clip used by being attached to an insulating partition wall of a terminal block.

  The terminal block is used to connect the electric wires, and is attached to the inner surface of a control panel that houses control devices, for example. The terminal block is provided with a plurality of connection screws for connecting the electric wires in the horizontal direction, and each connection screw is partitioned by an insulating partition.

  Measurement of electric circuits in periodic inspections and the like is performed by sandwiching the head of the connection screw of the terminal block with a hook clip connected to the measuring instrument. Since the head of the connection screw has a hemispherical shape, it may come off due to vibration or impact even if it is pinched by a hook clip. In view of this, there is known a clip that is prevented from being easily detached from a connection screw due to vibration or impact (see, for example, Patent Documents 1 and 2). In the terminal screw connection clip of Patent Document 1, a cylindrical member is fitted into the outer periphery of the head of the connection screw so that the conductor is brought into contact with the top of the connection screw. Moreover, the mouth clip of Patent Document 2 prevents the connection screw from coming off due to vibration or impact by sandwiching the head of the connection screw from three directions.

Japanese Patent Laid-Open No. 08-273727 JP 2009-26663 A

  However, since the clip for terminal screw connection in Patent Document 1 adopts a structure in which a cylindrical member is fitted into the head of the connection screw, it can be used when the outer diameter of the head of the connection screw is different. There is a problem that you can not. In other words, the connection screw varies in size depending on the purpose of use, and if the outer diameter of the head of the connection screw is too small or too large relative to the inner diameter of the tubular member, the connection screw is securely held by the tubular member There is a problem that the tubular member cannot be removed from the connection screw. Therefore, in the case of the terminal screw connection clip of Patent Document 1, it is necessary to prepare a large number of cylindrical members having an optimum size according to the size of the connection screw, and each time the size of the connection screw changes, the cylindrical shape is changed. The member needs to be replaced.

  In the case of the hook clip of Patent Document 2, since the head of the connection screw is sandwiched from three directions, the hook clip interferes with the insulation partition and pinches the connection screw when the mounting interval of the insulation partition of the terminal block is narrow. I can't. In the case of a structure in which the connecting screw is sandwiched from three directions, it is necessary to adjust the posture of the shed clip in order to expand the diameter of the lip clip as much as possible while the tip of the shed clip is inserted between the insulating partitions. There is a problem that handling is troublesome as compared with the case of sandwiching from two directions.

  Therefore, an object of the present invention is to provide a mouth clip that is easy to handle and can reliably maintain contact with the head of a connection screw against vibration and impact.

  In order to achieve the above-mentioned object, the invention according to claim 1 is provided with a first clip member connected to a measuring instrument side and made of a conductive member, and opposed to the first clip member. A second clip member that is swingably coupled to the clip member, and a biasing means that biases the tip end portion of the first clip member and the tip end portion of the second clip member toward each other. The first clip member includes a tip portion formed by a tip portion of the first clip member and a tip portion of the second clip member, and sandwiching an insulating partition wall of the terminal block by the biasing means. The leading end of the member contacts the head of the connection screw of the terminal block in a state where the sandwiching portion sandwiches the insulating partition, and the leading end of the second clip member has the sandwiching portion that connects the insulating partition. Separating the insulating partition in a sandwiched state A crocodile clamp, characterized in that it is electrically insulated from the other of the head of the connecting screw in contact.

  According to the present invention, in a state where the holding portion holds the insulating partition of the terminal block, the tip of the first clip member contacts the head of the connection screw, and the tip of the second clip member fixes the insulating partition. It is electrically insulated from the heads of other connecting screws adjacent to each other.

  According to a second aspect of the present invention, in the shed clip according to the first aspect, the second clip member is made of an insulator.

  According to a third aspect of the present invention, in the shed clip according to the first or second aspect, the clamping portion includes a slip that prevents movement of the first clip member and the second clip member with respect to the insulating partition wall. A stop member is provided.

  According to the first aspect of the present invention, since the insulating partition of the terminal block is held by the holding portion, the first structure can be used even if vibration or impact occurs compared to the conventional structure in which the head of the connection screw is held. The contact between the tip of the clip member and the connection screw can be reliably maintained. In addition, the attachment of the shed clip to the insulating partition only requires that the insulating partition be clamped by the clamping portion, and therefore the handling of the shed clip during measurement of an electric circuit is easier than the conventional structure. Furthermore, since only one of the first clip member and the second clip member enters between the insulating partition walls, it can be used even when the space between the insulating partition walls is narrow, and the sizes are different. It can be applied to various terminal blocks.

  According to the second aspect of the present invention, since the second clip member is made of an insulator, it is not necessary to attach a new insulating part to the tip of the second clip member, and the structure of the mouth clip is improved. It can be simplified.

  According to the third aspect of the present invention, since the anti-slip member is provided in the clamping portion, the movement of the first clip member and the second clip member with respect to the insulating partition wall due to vibration or impact can be prevented. The contact reliability between the first clip member and the connection screw can be further increased.

It is a front view which shows the use condition of the shed clip concerning Embodiment 1 of this invention. It is an enlarged front view of the shed clip of FIG. It is a partial expanded sectional view of the front-end | tip part in the shed clip of FIG. It is a perspective view of the 1st clip member in the shed clip of FIG. It is a top view which shows the state just before attaching the shed clip of FIG. 2 to a terminal block. It is a top view which shows the inspection state of the electric circuit by the mouth clip of FIG. It is a front view of the shed clip concerning Embodiment 2 of this invention. FIG. 8 is an enlarged front view of the vicinity of a non-slip member in the mouth clip of FIG. 7. It is a front view which shows the use condition of the shed clip concerning Embodiment 3 of this invention. It is a front view which shows the use condition of the shed clip concerning Embodiment 4 of this invention. It is an enlarged front view of the shed clip of FIG. It is an enlarged plan view of the contact leaf | plate spring in the shed clip of FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
1 to 6 show Embodiment 1 of the present invention. 1 and 5 show a terminal block 100 to which the shed clip 1 of the present invention is applied. The terminal block 100 has a plurality of bases 101 made of synthetic resin. An insulating partition wall 102 made of synthetic resin is provided on the side surface of the base 101. The insulating partition wall 102 is formed integrally with the base 101 and is formed only on one side surface of the base 101. The plurality of bases 101 are held side by side by holding rails 105.

  A metal connection plate 104 for connecting one electric wire 106 and the other electric wire 107 is fixed to the upper surface of each base 101. Connection screws 103 are screwed to both ends of the connection plate 104. The connection screw 103 is for fixing the ends of the electric wires 106 and 107 to the connection plate 104. The connection screw 103 has a head portion 103a formed in a hemispherical shape. The insulating partition wall 102 protrudes upward from the upper surface of the base 101, and the upper end portion is located above the head 103 a of the connection screw 103. Accordingly, the connection screw 103 and the connection plate 104 of each base 101 are partitioned by the insulating partition wall 102.

  FIG. 1 shows a shed clip 1. The shed clip 1 includes a first clip member 2, a second clip member 3, a connecting shaft 4, a torsion spring 5 as urging means, and a clamping portion 6. The 1st clip member 2 is comprised from the metal plate which is an electroconductive member, and is bent so that a cross-sectional shape may become a U-shape. As shown in FIG. 2, a pressing portion 2 a as a power point is formed on one side of the first clip member 2 in the longitudinal direction. On the other side of the first clip member 2 in the longitudinal direction, a tip 2b as an action point is formed. A fulcrum part 2c is formed between the pressing part 2a and the tip part 2b. As shown in FIG. 4, a connecting hole 2c1 is formed in the fulcrum part 2c. A connecting shaft 4 described later can be inserted into the connecting hole 2c1. A lead wire 2j is connected to the inner surface side of the pressing portion 2a of the first clip member 2. The lead wire 2j can be connected to a measuring instrument 31 described later.

  On the inner side of the first clip member 2 on the distal end portion 2b side, a clamping surface 2d that can contact the insulating partition wall 102 of the terminal block 100 is formed. The sandwiching surface 2d is formed in a waveform in which triangular waves are continuous. A contact 2 f that can contact the connection screw 103 is provided at the distal end portion 2 b of the first clip member 2. The contact 2f has a substantially L-shaped outer shape. The contact 2f is movable in the arrow F1 direction with respect to the tip 2b. The contact 2f has a cylindrical portion 2f1 that is movably fitted to the distal end portion 2b, and a contact portion 2f2 that extends in a direction orthogonal to the cylindrical portion 2f1. A compression coil spring 2h is provided in a space 2f3 formed inside the cylinder 2f1. One end of the compression coil spring 2h is in contact with the inner surface of the contact portion 2f2. The other end of the compression coil spring 2h is in contact with a holding wall 2e fixed on the inner side of the first clip member 2 on the distal end portion 2b side.

  A holding shaft 2g is provided inside the compression coil spring 2h. The holding shaft 2g is inserted into a holding hole (not shown) formed in the holding wall 2e, and one end 2g1 is fixed to the inner surface of the contact portion 2f2. A stopper 2g2 that can come into contact with the holding wall 2e is formed at the other end of the holding shaft 2g. Thereby, the contact 2f is urged in a direction away from the tip 2b by the compression coil spring 2h. The moving distance of the contact 2f by the compression coil spring 2h is regulated by the stopper 2g2 coming into contact with the holding wall 2e. An arcuate leaf spring 2i made of a conductive member is provided between the inner surface of the cylindrical portion 2f1 and the outer surface of the tip portion 2b. The leaf spring 2i has a function of reducing electrical contact resistance between the contact 2f and the tip 2b.

  As shown in FIG. 2, the second clip member 3 is provided to face the first clip member 2. Unlike the first clip member 2, the second clip member 3 is made of an insulator that does not conduct electricity. In this Embodiment 1, the 2nd clip member 3 is comprised from the synthetic resin which has high electrical insulation resistance. As shown in FIG. 2, a pressing portion 3 a as a power point is formed on one side of the second clip member 3 in the longitudinal direction. On the other side of the second clip member 3 in the longitudinal direction, a tip 3b as an action point is formed. A fulcrum part 2c is formed between the pressing part 3a and the tip part 3b. On the inner side of the distal end portion 3b side of the second clip member 3, a clamping surface 3d that can contact the insulating partition wall 102 of the terminal block 100 is formed. The sandwiching surface 3d is formed in a waveform in which triangular waves are continuous.

  A connection hole (not shown) used for connection with the first clip member 2 is formed in the fulcrum portion 3 c of the second clip member 3. As shown in FIG. 2, the second clip member 3 is swingably connected to the first clip member 2 via a connecting shaft 4. On the outer periphery of the connecting shaft 4, a torsion spring 5 is provided as a biasing means for biasing the distal end portion 2 b of the first clip member 2 and the distal end portion 3 b of the second clip member 3 toward each other. ing. The clamping surface 2 d of the first clip member 2 and the clamping surface 3 d of the second clip member 3 are in close contact with each other by the urging force of the torsion spring 5.

  The mouth clip 1 is formed with a clamping surface 2 d of the first clip member 2 and a clamping surface 3 d of the second clip member 3, and a clamping portion 6 that clamps the insulating partition wall 102 of the terminal block 100 by the torsion spring 5. Have. The clamping part 6 should just have the function to pinch | interpose the insulating partition 102 of the terminal block 100 reliably, and does not require the function to clamp the connection screw 103. FIG. The front end 2b of the first clip member 2 contacts the head 103a of the connection screw 103 of the terminal block 100 in a state where the sandwiching portion 6 sandwiches the insulating partition wall 102, and the front end 3b of the second clip member 3 is The sandwiching portion 6 is electrically insulated from the head 103a of another connecting screw 103 adjacent to the insulating partition wall 102 with the insulating partition wall 102 interposed therebetween. That is, since the second clip member 3 is made of an insulator having a high electrical insulation resistance, the second clip member 3 is connected to the connection screw 103 in a state in which the holding portion 6 holds the insulating partition wall 102. It is electrically insulated from the head 103a.

  Next, the usage method and operation of the shed clip 1 according to Embodiment 1 will be described.

  In periodic inspections of electric circuits, voltage and the like are measured using the connection screws 103 of the terminal block 100 to which the electric wires 106 and 107 are connected. As shown in FIG. 6, the measurement of the electric circuit is performed by attaching the two shed clips 1 to the insulating partition wall 102 of the terminal block 100. For measurement, first, the lead wires 2j of the two lip clips 1 are connected to the measuring device 31. In this state, by pressing the pressing portion 2a of the first clip member 2 and the pressing portion 3a of the second clip member 3 in each hook clip 1 by hand in the direction approaching each other, the distal end of the first clip member 2 The portion 2b is separated from the distal end portion 3b of the second clip member 3, and the insulating partition wall 102 of the terminal block 100 can be sandwiched.

  FIG. 5 shows a state immediately before attaching the shed clip 1 to the terminal block 100. In this state, the shed clip 1 is positioned such that the insulating partition wall 102 is positioned between the distal end portion 2 b of the first clip member 2 and the distal end portion 3 b of the second clip member 3. Then, with the contact 2 f of the first clip member 2 in contact with the head 103 a of the connection screw 103, the pressing portion 2 a of the first clip member 2 and the pressing portion 3 a of the second clip member 3 Release the hand. As a result, the distal end portion 2ba of the first clip member 2 and the distal end portion 3b of the second clip member 3 are moved toward each other by the biasing force of the torsion spring 5, and the insulating partition wall 102 is moved to the first clip member 2. Is sandwiched between the sandwiching surface 2d of the second clip member 3 and the sandwiching surface 3d of the second clip member 3.

  FIG. 1 shows a state in which the insulating partition wall 102 is sandwiched between the sandwiching surface 2 d of the first clip member 2 and the sandwiching surface 3 d of the second clip member 3. In this state, the contact 2 f of the first clip member 2 is in contact with the head 103 a of the connection screw 103. That is, in this state, the contact portion 2f2 of the contact 2f shown in FIG. 3 is pressed against the head 103a of the connection screw 103 by the compression coil spring 2h, so that the contact portion 2f2 reliably contacts the head 103a of the connection screw 103. Will do. Further, since the contact portion 2f2 is in contact with the distal end portion 2b of the first clip member 2 via the cylindrical portion 2f1 and the conductive leaf spring 2i, contact failure can be avoided, and the connection screw 103 is It is electrically connected to the measuring instrument 31 through the mouth clip 1. Therefore, as shown in FIG. 6, the voltage applied to the connection screw 103 can be accurately read by the measuring device 31.

  As described above, since the insulating partition wall 102 of the terminal block 100 is clamped by the clamping portion 6 of the mouth clip 1, even if vibration or impact occurs compared to the conventional structure in which the head 103a of the connection screw 103 is sandwiched. The contact between the first clip member 2 and the connection screw 103 can be reliably maintained. In addition, since the first clip member 2 can be attached to the insulating partition wall 102 only by holding the insulating partition wall 102 by the sandwiching portion 6, the handling of the mouth clip 1 at the time of measuring an electric circuit is easier than the conventional structure. It becomes.

  Furthermore, since only one of the first clip member 2 and the second clip member 3 enters between the insulating partition wall 102 and the insulating partition wall 102 adjacent thereto, the space between the insulating partition walls 102 is reduced. Can be used even in a narrow case, and can be applied to various terminal blocks 100 having different sizes. And since the 2nd clip member 2 is comprised from the insulator, it is not necessary to attach a new insulation component to the front-end | tip part 2b of the 2nd clip member 2, and can simplify the structure of the shed clip 1 it can.

(Embodiment 2)
7 and 8 show a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is only the presence or absence of the anti-slip member 10, and the other parts are the same as in the first embodiment. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals. Therefore, the description is omitted. The same applies to other embodiments described later.

  As shown in FIG. 7, an anti-slip member 10 is attached to the clamping portion 6 of the shed clip 1. That is, the anti-slip member 10 is attached to the clamping surface 2d of the first clip member 2 and the clamping surface 3d of the second clip portion 3, respectively. The anti-slip member 10 has a function of preventing the movement of the first clip member 2 and the second clip member 3 with respect to the insulating partition wall 102.

  As shown in FIG. 8, the anti-slip member 10 has a plurality of protrusions 10 a formed continuously. The protrusion 10a is formed so that the tip end portion extends in an oblique direction. In a state where the insulating partition wall 102 of the terminal block 100 is sandwiched by the sandwiching portion 6, the direction in which the mouth clip 1 is separated from the connection screw 103 (arrow F2 direction) Has a function of preventing movement.

  In the second embodiment configured as described above, since the holding member 6 is provided with the anti-slip member 10, the insulating partition wall 102 between the first clip member 2 and the second clip member 3 due to vibration or impact. Therefore, the reliability of the contact between the first clip member 2 and the connection screw 103 can be further improved.

(Embodiment 3)
FIG. 9 shows Embodiment 3 of the present invention. In the first and second embodiments, the second clip member 3 is made of an insulator. In the third embodiment, the second clip member 31 is made of a metal plate as a conductive member. In the third embodiment, in order to maintain electrical insulation between the second clip member 31 and the adjacent connection screw 103, the holding surface 3d of the second clip member 31 is in contact with the top portion 102a of the insulating partition wall 102. A possible notch 3f is formed. Thus, in a state where the insulating partition wall 102 of the terminal block 100 is sandwiched by the sandwiching portion 6, the distance between the distal end portion 3b of the second clip member 31 and the connection screw 103 is set to H, and the second clip member 31 Electrical insulation from the connection screw 103 is maintained.

  In Embodiment 3, a contact plate 2k is formed at the tip 2b of the first clip member 2 as a substitute for the contact 2f shown in FIG. The contact plate 2k extends in a direction orthogonal to the tip portion 2b. The contact plate 2k can be elastically deformed in the direction of the arrow F3. When the insulating partition wall 102 of the terminal block 100 is sandwiched by the sandwiching portion 6, the contact plate 2k is in close contact with the connection screw 103 by self-elasticity.

  In Embodiment 3 configured as described above, since the cutout portion 3f is formed in the second clip member 3, the second clip member 3 is not formed from an insulator. 3 and the connection screw 103 can be kept electrically insulated. Further, since the elastically deformable contact plate 2k is used, the contact performance between the first clip member 2 and the connection screw 103 can be enhanced without using the contact 2f having a complicated structure.

(Embodiment 4)
10 to 12 show a fourth embodiment of the present invention. In the first embodiment, the contact 2f is brought into contact with the connection screw 103. However, in the third embodiment, the contact spring 21 is used to make contact with the connection screw 103. As shown in FIG. 11, a contact spring 21 is provided on the outer side of the distal end portion 2 b of the first clip member 2. The contact spring 21 includes a substrate 21a and a linear spring body 21b. The substrate 21a is made of a metal plate that is a conductive member, and is attached to the first clip member 2 by soldering, for example. The linear spring body 21b is bonded to the upper surface of the substrate 21a and is electrically connected to the substrate 21a. The linear spring main body 21b is a collection of a plurality of fine linear springs in a plate shape, and is elastically deformed in the direction of the arrow F4 when in contact with the connection screw 103.

  In the fourth embodiment configured as described above, the linear spring body 21 b of the contact spring 21 contacts the connection screw 103 in a state where the clamping unit 6 clamps the insulating partition wall 102 of the terminal block 100. At the same time, the second clip member 3 also contacts the adjacent connection screw 103, but the second clip member 3 is made of an insulator, so the second clip member 3 and the connection screw 103 Conduction of is avoided. Further, by pushing the shed clip 1 toward the terminal block 100, the contact spring 21 bites between the insulating partition wall 102 and the connection screw 103, and the contact between the contact spring 21 and the connection screw 103 is more reliable. Can be.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to the above-described embodiment, and even if there is a design change or the like without departing from the gist of the present invention, It is included in this invention. For example, in the first embodiment, the second clip member 3 is made of an insulator. However, the second clip member 3 may be made of a metal member, and the entire metal member may be covered with an insulating resin. In the third embodiment, the second clip member 31 is made of a metal plate as a conductive member, and a notch portion that can contact the top portion 102a of the insulating partition wall 102 on the clamping surface 3d side in order to maintain electrical insulation. Although 3f is formed, it is good also as a structure which covers the front-end | tip part 3b with an insulation cap in order to ensure electrical insulation.

DESCRIPTION OF SYMBOLS 1 Hook clip 2 1st clip member 2b Tip part 2d Holding surface 2f Contact 3 Second clip member 3b Tip part 3d Holding surface 3f Notch part 4 Connecting shaft 5 Torsion spring (biasing means)
6 Nipping part 10 Non-slip member 31 Measuring instrument 100 Terminal block 102 Insulating partition 103 Connection screw

Claims (3)

A first clip member made of a conductive member connected to the measuring instrument side;
A second clip member provided facing the first clip member and pivotably coupled to the first clip member;
An urging means for urging the distal end portion of the first clip member and the distal end portion of the second clip member to approach each other;
A pinching portion formed by a tip portion of the first clip member and a tip portion of the second clip member, and sandwiching an insulating partition wall of the terminal block by the biasing means;
With
The distal end portion of the first clip member contacts the head of the connection screw of the terminal block with the sandwiching portion sandwiching the insulating partition, and the distal end portion of the second clip member is the sandwiching portion. A hook clip characterized in that it is electrically insulated from the heads of other connecting screws adjacent to each other with the insulating partition wall interposed therebetween. The mouth clip according to claim 1, wherein the second clip member is made of an insulator. 3. The shed according to claim 1, wherein the holding portion is provided with an anti-slip member that prevents movement of the first clip member and the second clip member with respect to the insulating partition wall. clip.

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