Withstand voltage test jig and parts thereof and method for short-circuiting terminal block

Abstract

To provide a jig which can be attached to a terminal block in a short time while being applicable to terminal blocks with any configuration regardless of the shape of a barrier wall interposed between connection terminals.SOLUTION: A withstand voltage test jig 10 is a jig used for a withstand voltage test of a terminal block 1 including a plurality of connection terminals 2 and a plurality of terminal screws 3a, 3b for connecting an electric wire to the connection terminals 2 by being fastened to the connection terminals 2, or of an electric device connected to the terminal block 1 via an electric wire. The jig includes a base body 11 formed of a conductor, and a plurality of pairs of holding pieces 12a, 12b formed of a conductor and extending from the base body 11, each pair being capable of holding a head portion 3a1 of the terminal screw 3a at a distal end side.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a withstand voltage test jig, components thereof, and a method for short-circuiting a terminal block, and more particularly to a withstand voltage test jig, components thereof, and a method for short-circuiting a terminal block used for withstand voltage tests of terminal blocks used for connecting electric wires in various electrical devices such as control panels, and for withstand voltage tests of various electrical devices such as control panels using the terminal blocks. [Background technology]

[0002] Conventionally, a known jig of this type is a short-circuiting plate for row-mounted terminals (see Patent Document 1), which is made up of multiple connection pieces each having a U-shaped fastening seat at its tip that is fastened and fixed with a terminal screw, and which is connected to one another via a plate-shaped bridging portion, and in which the bridging portion has a bent portion that bends toward either the front or back of the plate surface that constitutes the bridging portion as an adjustment portion to absorb changes in the expansion and contraction of the spacing between adjacent fastening seats.

[0003] However, with a jig such as the one described above, the U-shaped fastening seats must be inserted one by one between the corresponding screw and terminal piece of the connection terminal and tightened, which has the disadvantage that the installation work takes a lot of time.

[0004] In order to solve the above problems, for example, Patent Document 2 discloses a short circuit plate for voltage withstand tests, which is made up of a short circuit plate body made of conductive metal, elastic locking portions formed on both sides of the short circuit plate body, which elastic locking portions made of conductive metal are folded downward so as to be locked by both of the elastic locking portions in the cover locking recesses located on both sides of the terminal block, and a plurality of elastic contact pieces made of conductive metal protruding from the short circuit plate body via the elastic locking portion on one side, which elastic contact pieces are arranged in accordance with the arrangement pitch of the connection terminals of the corresponding terminal block. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 9-139244 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-273189 Summary of the Invention [Problem to be solved by the invention]

[0006] With the short-circuiting plate described in Patent Document 2, it is possible to short-circuit the connection terminals of the terminal block simply by attaching the elastic locking portions provided on both sides of the short-circuiting plate body to the terminal block. However, as mentioned above, in order to attach the elastic locking portions of the short-circuiting plate to the terminal block, it is necessary to provide locking recesses into which the elastic locking portions can be fitted on the sides of the partition wall interposed between the terminals of the terminal block. However, there is a problem that the short-circuiting plate with the above configuration cannot be attached to existing terminal blocks that do not have such recesses or terminal blocks in which it is difficult to provide such recesses, and therefore there is a problem that the applicable terminal blocks are limited.

[0007] In view of the above circumstances, the technical problem to be solved by the present invention is to provide a terminal block that can be applied to any shape, regardless of the shape of the partition wall interposed between the connection terminals, and that can be attached to the terminal block in a short time. [Means for solving the problem]

[0008] The above-mentioned problems are solved by the withstand voltage test jig according to the present invention. That is, this jig is used for a withstand voltage test of a terminal block including a plurality of connection terminals and a plurality of terminal screws capable of connecting electric wires to the connection terminals by fastening to the connection terminals, or of an electrical device connected to the terminal block via an electric wire, and is characterized in that it includes a base formed of a conductor and a plurality of pairs of clamping pieces formed of a conductor and extending from the base, the pairs of clamping pieces being capable of clamping the heads of the terminal screws at their tip sides.

[0009] As described above, the withstand voltage test jig according to the present invention includes a base and a plurality of pairs of clamping pieces that are made of a conductor and extend from the base, capable of clamping the heads of terminal screws at their distal ends. Because the heads of the terminal screws are open on the terminal block, the jig described above can be approached from the head side of the terminal screws, allowing the heads of the corresponding terminal screws to be inserted between each pair of clamping pieces. Therefore, with the jig described above, multiple terminals can be simultaneously short-circuited with a single installation operation, thereby enabling short-circuiting operations for, for example, withstand voltage tests to be carried out extremely quickly and easily. Furthermore, because the jig according to the present invention shorts terminals by installation on the terminal screws, the present invention can be applied to terminal blocks of any shape, regardless of the shape of the bulkhead.

[0010] In the withstand voltage test jig according to the present invention, the pair of clamping pieces may be connected to each other at their base ends via a connecting portion, and the connecting portion may be detachably fixed to the base body.

[0011] With this configuration, multiple pairs of connected clamping pieces can be manufactured separately from the base, and then the required number can be attached to the base, which reduces the overall manufacturing cost and makes it easy to manufacture a jig according to the number of terminals in the terminal block.In addition, even if some of the clamping pieces become worn out due to continued use, only the worn clamping pieces can be removed and replaced with new clamping pieces, which is also economical in this respect.

[0012] Furthermore, in the withstand voltage test jig according to the present invention, when the jig has the above-mentioned connecting portion, the pair of clamping pieces and the connecting portion may be an integrated product formed by bending both sides of a single long plate in the same direction.

[0013] By forming the pair of clamping pieces and the connecting portion into a single piece by bending a single long plate, the pair of clamping pieces can easily function like a leaf spring. Therefore, for example, by making the distance between the tips of the pair of clamping pieces smaller than the diameter of the head of the terminal screw to be clamped, it is possible to clamp the head of the terminal screw between the pair of clamping pieces and achieve electrical connection simply by inserting the head of the terminal screw between the pair of clamping pieces and spreading the pair of clamping pieces outward. Furthermore, with a single piece such as the one described above, it is easy to make single pieces of exactly the same shape by, for example, cutting a single long plate to the same length and bending it in the same way. According to the jig of the present invention, the heads of multiple terminal screws provided on the terminal block are clamped simultaneously by multiple pairs of clamping pieces. Therefore, if there is a large variation in the shape or dimensions of the clamping pieces of each pair, it is difficult to clamp all of the terminal screw heads in a single installation operation. However, if the clamping pieces of each pair have exactly the same shape and dimensions as described above, it is possible to easily and reliably clamp all of the terminal screw heads with each pair of clamping pieces in a single installation operation.

[0014] Of course, by bending a single long plate to make an integrated product consisting of a pair of clamping pieces and a connecting part, the process of connecting the connecting parts to each clamping piece by welding or the like is not necessary, and manufacturing costs can be kept low. Furthermore, with an integrated product such as the one described above, it is possible to easily mass-produce integrated products of the exact same shape by cutting a single long plate to the same length and using the same processing, which also helps to keep manufacturing costs low.

[0015] In the withstand voltage test fixture according to the present invention, the distance between the opposing clamping pieces may be narrower on the tip side than on the base side of the pair of clamping pieces.

[0016] For example, if you try to clamp the head of a terminal screw with a pair of clamping pieces that have a constant distance between them from the base end to the tip end, pushing the head of the terminal screw between the pair of clamping pieces causes the pair of clamping pieces to spread out in a V-shape, reducing the contact area between each clamping piece and the head of the terminal screw and resulting in an unstable contact state; in other words, there is a risk that a stable electrical connection will not be obtained. In contrast, by narrowing the distance between the pair of clamping pieces at the tip end compared to the base end, it is possible to clamp the head of the terminal screw with the pair of clamping pieces in a parallel position. This ensures a sufficient contact area between each clamping piece and the head of the terminal screw, stabilizing the contact state and ultimately the electrical connection state.

[0017] The above-mentioned problems are also solved by a terminal screw clamping component for a withstand voltage test jig according to the present invention. That is, this component is a component for a withstand voltage test jig used in withstand voltage tests of a terminal block having a plurality of connection terminals and a plurality of terminal screws capable of connecting electric wires to the connection terminals by fastening to the connection terminals, or of an electrical device connected to the terminal block via an electric wire, and is characterized in that it comprises an attached portion made of a conductor and attached to a base of the withstand voltage test jig, and a pair of clamping pieces made of a conductor and integral with the attached portion, extending in the same direction from the attached portion and capable of clamping the head of a terminal screw at their tip sides.

[0018] With components having the above configuration, for example, by using a jig in which these components are attached to a common member according to the arrangement of the terminal screws, the heads of the corresponding terminal screws can be inserted between each pair of clamping pieces in a single installation operation. Therefore, with components having the above configuration, multiple terminals can be short-circuited simultaneously with a single installation operation, thereby making it possible to perform short-circuiting work for, for example, voltage withstand tests in an extremely short time and easily. Furthermore, with components according to the present invention, since the terminals are short-circuited by attachment to the terminal screws, the present invention can be applied to terminal blocks of any shape, regardless of the shape of the bulkhead.

[0019] The above-mentioned problem is also solved by a short-circuiting method for a terminal block according to the present invention. That is, this short-circuiting method is a method for short-circuiting the connection terminals of a terminal block having a plurality of connection terminals and a plurality of terminal screws that can be fastened to the connection terminals to connect electric wires to the connection terminals, and is characterized in that a withstand voltage test jig having a base made of a conductor and a plurality of pairs of clamping pieces that are made of a conductor and extend from the base and can clamp the heads of the terminal screws at their tip sides is brought close to the heads of the terminal screws, and the heads of the corresponding terminal screws are clamped by each pair of clamping pieces.

[0020] According to the above-described method, similar to the withstand voltage test jig of the present invention, multiple terminals can be simultaneously short-circuited by simply approaching the jig having the above-described configuration from the head side of the terminal screws and inserting the heads of the corresponding terminal screws between each pair of clamping pieces. Therefore, for example, short-circuiting work for a withstand voltage test can be carried out extremely quickly and easily. Furthermore, with the method of the present invention, since the terminals are short-circuited by attaching them to the terminal screws, the present invention can be applied to terminal blocks of any shape, regardless of the shape of the bulkhead. [Effects of the Invention]

[0021] As described above, the voltage resistance test jig and its components, and the terminal block short-circuiting method according to the present invention can be applied to terminal blocks of any shape, regardless of the shape of the partition wall interposed between the connection terminals, and can be attached to the terminal block in a short time. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a perspective view of a withstand voltage test jig according to an embodiment of the present invention; [Figure 2] FIG. 2 is a side view of the withstand voltage test jig shown in FIG. [Figure 3] FIG. 2 is a front view of the withstand voltage test jig shown in FIG. [Figure 4] 1 is a plan view showing an example of a terminal block to which a withstand voltage test jig according to the present invention is attached. FIG. [Figure 5]5 is a perspective view showing a state in which the withstand voltage test jig shown in FIG. 1 is attached to the terminal block shown in FIG. 4. FIG. [Figure 6] 6 is a front view of the terminal block and the withstand voltage test jig shown in FIG. 5. FIG. [Figure 7] FIG. 10 is a perspective view of a withstand voltage test fixture according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A withstand voltage test jig according to an embodiment of the present invention and a method for short-circuiting a terminal block using the jig will be described below with reference to the accompanying drawings.

[0024] 1 to 3 are a perspective view, a side view, and a front view, respectively, of a withstand voltage test jig 1 according to this embodiment. As shown in these figures, this withstand voltage test jig 10 is used for withstand voltage tests of terminal blocks 1 used for connecting electric wires in various electrical devices such as control panels, and for withstand voltage tests of various electrical devices such as control panels that use the terminal blocks 1.

[0025] Here, the terminal block 1 to which the withstand voltage test jig 10 is applied includes a plurality of connection terminals 2 insulated from one another, and a plurality of terminal screws 3a, 3b that can connect electric wires (not shown) to the connection terminals 2 by fastening them to the connection terminals 2 with the electric wires sandwiched between the connection terminals 2. In this embodiment, the plurality of connection terminals 2 insulated from one another are arranged in a row, and two terminal screws 3a, 3b can be fastened to each connection terminal 2. That is, the terminal screws 3a on one side of the arrangement direction of the connection terminals 2 are arranged in a row in the same direction as the connection terminals 2, and the terminal screws 3b on the other side of the arrangement direction of the connection terminals 2 are arranged in a row in the same direction as the connection terminals 2. In this case, the connection terminals 2 and the terminal screws 3a, 3b are all formed of conductors, and for each connection terminal 2, a first electric wire (not shown) is connected by fastening one terminal screw 3a, and a second electric wire (not shown) is connected by fastening the other terminal screw 3b, thereby enabling conduction of a set of electric wires (first and second electric wires) for one connection terminal 2. Furthermore, partition walls 4 are disposed between the multiple connection terminals 2 arranged in a row.

[0026] The withstand voltage test jig 10 includes a base 11 and a plurality of pairs of clamping pieces 12a, 12b extending from the base 11 and capable of clamping the head 3a1 (3b1) of the terminal screw 3a (3b) at their tip ends.

[0027] The base 11 is made of a conductor and has a shape corresponding to the arrangement of the terminal screws 3a (3b) of the terminal block 1 to be short-circuited. That is, in this embodiment, the terminal screws 3a (3b) are arranged in a row, and therefore the base 11 has an elongated shape so that multiple pairs of clamping pieces 12a, 12b can be arranged according to the arrangement of these terminal screws 3a (3b).

[0028] In this embodiment, the base body 11 is provided with screw holes 14 (see FIG. 3) aligned in the longitudinal direction of the base body 11, the number of which is equal to the number of pairs of clamping pieces 12a, 12b to be attached.

[0029] The pair of clamping pieces 12a, 12b are capable of clamping the head 3a1 (3b1) of the terminal screw 3a (3b) at their tip ends, and each of the clamping pieces 12a, 12b is plate-shaped (see FIG. 1). One end of each of the clamping pieces 12a, 12b is connected to each other by a connecting portion 15 so that the surfaces of the plate-shaped clamping pieces 12a, 12b face each other.

[0030] Here, the posture of the pair of clamping pieces 12a, 12b is arbitrary as long as the surfaces face each other, and in this embodiment, the pair of clamping pieces 12a, 12b are inclined relative to each other so that the opposing distance d1 at the tip end side of the pair of clamping pieces 12a, 12b is narrower than the opposing distance d2 at the base end side (see Figure 3).

[0031] The connecting portion 15 is, for example, plate-shaped, and is connected at one end to a pair of clamping pieces 12a and 12b, which are also plate-shaped.

[0032] In this embodiment, the pair of clamping pieces 12a, 12b and the connecting portion 15 having the above-described configuration are integrally formed as a terminal screw clamping component 16 that constitutes the withstand voltage test jig 10. That is, in this embodiment, the pair of clamping pieces 12a, 12b and the connecting portion 15 are attached to the base 11 of the withstand voltage test jig 10 as an integral product (terminal screw clamping component 16) made by bending both sides of a single long plate having a certain width in the same direction (see FIGS. 1 and 3).

[0033] In this case, the method of connecting the terminal screw clamping component 16 (connecting portion 15) to the base 11 is arbitrary. In this embodiment, a through hole 17 is provided in the connecting portion 15, and the threaded portion 18a of a connecting screw 18 is inserted into this through hole 17 from the side of the pair of clamping pieces 12a, 12b and fastened to the screw hole 14 provided in the base 11, thereby removably connecting the terminal screw clamping component 16, which integrally has the connecting portion 15 and the pair of clamping pieces 12a, 12b, to the base 11. In the illustrated example, of the multiple connecting screws 18 fastened to the screw holes 14 of the base 11 arranged in series, the threaded portions 18a of the connecting screws 18 located at both ends are longer than the other connecting screws 18 (see FIG. 2). This facilitates, for example, electrical connection between a power source used in a withstand voltage test and the withstand voltage test jig 10.

[0034] The material of the base 11 and the pair of clamping pieces 12a, 12a (terminal screw clamping parts 16) can be any material as long as it is conductive. For example, from the standpoint of corrosion resistance, various steel plates such as stainless steel, especially steel plates that have been subjected to various plating treatments such as chromate treatment, can be suitably used.

[0035] Next, an example of a usage mode (a method of short-circuiting the terminal block 1) of the withstand voltage test jig 10 having the above-described configuration will be described mainly with reference to FIGS.

[0036] First, the withstand voltage test jig 10 shown in Fig. 1 is placed above the terminal block 1, more precisely at a position where one of the terminal screws 3a, 3b faces the pair of clamping pieces 12a, 12b. Then, the withstand voltage test jig 10 is brought closer to the terminal block 1, and the pair of clamping pieces 12a, 12b is inserted between the adjacent partition walls 4, 4, and each pair of clamping pieces 12a, 12b clamps the head 3a1 of the corresponding terminal screw (here, the terminal screws 3a in one row). This attaches the withstand voltage test jig 10 to the terminal block 1 and enables a short circuit between the terminal screws 3a, 3b and the connection terminals 2 that come into contact with them (see Fig. 5). In the illustrated example, by attaching a voltage resistance test jig 10 having a greater number of pairs of clamping pieces 12a, 12b than the number of connection terminals 2 (the number of terminal screws 3a) provided on the terminal block 1, it is possible to clamp the heads 3a1 of all of the terminal screws 3a with some of the clamping pieces 12a, 12b, and ultimately to short-circuit all of the connection terminals 2.

[0037] At this time, as shown in Fig. 6, each pair of clamping pieces 12a, 12b first abuts against the corners of head 3a1 of terminal screw 3a. That is, when no load is applied, the distance d1 (see Fig. 3) between clamping pieces 12a, 12b is set smaller than the outer diameter of head 3a1 of terminal screw 3a to be clamped. Therefore, the tips of clamping pieces 12a, 12b are first pressed against the corners of head 3a1 (the state shown by the two-dot chain lines in Fig. 6). If the corners of head 3a1 of terminal screw 3a are rounded as shown in Fig. 6, the tips of clamping pieces 12a, 12b are pushed apart in a direction that increases distance d1 as they are pressed into head 3a1, and head 3a1 is inserted between clamping pieces 12a, 12b (the state shown by the dashed lines in Fig. 6). Here, each of the clamping pieces 12a, 12b is plate-shaped and fixed at its base end to the base 11 (via the connecting portion 15), so that an elastic restoring force is generated as the clamping pieces 12a, 12b are pushed outward as described above. As a result, the head 3a1 inserted between the pair of clamping pieces 12a, 12b is clamped by the pair of clamping pieces 12a, 12b, and thus the pair of clamping pieces 12a, 12b and the head 3a1 are electrically connectable (electrically conductive).

[0038] When the above-described phenomenon occurs for the heads 3a1 of all the terminal screws 3a in one row, the heads 3a1 of all the terminal screws 3a are clamped by the pair of clamping pieces 12a, 12b. Therefore, in this state, by connecting a test power supply (not shown) to the threaded portions 18a (18a1) of the connecting screws 18 located at both ends of the base 11, for example, it becomes possible to conduct a withstand voltage test with all the connection terminals 2 of the terminal block 1 shorted. In this embodiment, to facilitate the above-described power supply connection work, the threaded portions 18a (18a1) of the connecting screws 18 located at both ends of the base 11 are longer than the threaded portions 18a of the connecting screws 18 other than those at both ends of the base 11 (see FIG. 2, etc.), but the present invention is not limited to this configuration.

[0039] As described above, the withstand voltage test jig 10 according to this embodiment is provided with a plurality of pairs of clamping pieces 12a, 12b, each of which is formed of a conductor along with the base 11 and extends from the base 11 to clamp the head 3a1 of the terminal screw 3a at its tip end. Because the head 3a1 side of the terminal screw 3a is open in the terminal block 1, the withstand voltage test jig 10 can be moved toward the head 3a1 side of the terminal screw 3a to insert the head 3a1 of the corresponding terminal screw 3a between each pair of clamping pieces 12a, 12b. As the clamping pieces 12a are pushed apart (see FIG. 6 ), the head 3a1 can be clamped between the pair of clamping pieces 12a, 12b simply by pushing the clamping piece 12a into the terminal screw 3a, thereby establishing electrical connection between the withstand voltage test jig 10 and each connection terminal 2 of the terminal block 1. Therefore, with the withstand voltage test jig 10 according to this embodiment, a plurality of connection terminals 2 can be simultaneously short-circuited by a single attachment operation, thereby enabling, for example, short-circuiting work for a withstand voltage test to be carried out extremely quickly and easily. Furthermore, with the withstand voltage test jig 10 according to this embodiment, the connection terminals 2 are short-circuited by attachment to the terminal screws 3a, so that the withstand voltage test jig 10 according to this embodiment can be applied to terminal blocks 1 of any shape, regardless of the shape of the bulkhead 4.

[0040] Furthermore, in this embodiment, the multiple pairs of clamping pieces 12a, 12b are arranged (attached to the base 11) according to the arrangement of the multiple terminal screws 3a to be clamped, so that with just one approaching action (pushing each of the clamping pieces 12a, 12b into the terminal screws 3a), the heads 3a1 of all of the target terminal screws 3a can be clamped by each pair of clamping pieces 12a, 12b. Therefore, with this configuration, the above-mentioned short-circuiting operation can be performed even more quickly and easily.

[0041] Although one embodiment of the present invention has been described above, the withstand voltage test jig and its components, and the terminal block short-circuiting method according to the present invention are not limited to the above-described exemplary configurations, and various modifications are possible within the scope of the present invention.

[0042] For example, in the above embodiment, the pair of clamping pieces 12a, 12b are illustrated as flat plates extending linearly (see FIG. 3, etc.). Of course, this is not limiting. For example, although not shown, the tips of each pair of clamping pieces 12a, 12b shown in FIG. 3 may be partially bent outward, i.e., the opposing distance d1 increases from the base end toward the tip end. This allows the tips of the pair of clamping pieces 12a, 12b to be easily spread apart when they abut against the head 3a1 of the terminal screw 3a. Therefore, even if the connecting screw 18 has a head with unrounded corners (not shown), the pair of clamping pieces 12a, 12b can be smoothly and reliably spread apart to clamp the head.

[0043] In any case, the pair of clamping pieces 12a, 12b may have any shape or structure as long as they have a shape or structure that allows them to clamp the head 3a1 as it is pushed into the head 3a1.

[0044] In the above embodiment, the pair of clamping pieces 12a, 12b are connected to each other via the connecting portion 15 (to form an integrated part as the terminal screw clamping part 16), but this is not limiting. For example, the connecting portion 15 may be omitted, and the base ends of the clamping pieces 12a, 12b may be directly attached to the base 11 by welding or the like.

[0045] In the above embodiment, the withstand voltage test jig 10 is illustrated as having more pairs of clamping pieces 12a, 12b than the number of connection terminals 2 to be short-circuited (i.e., the number of terminal screws 3a (3b)). However, it is of course possible to use it in other configurations. Fig. 7 shows a perspective view of a main part of a withstand voltage test jig 20 according to one example (another embodiment of the present invention). The withstand voltage test jig 20 according to this figure has a configuration in which two withstand voltage test jigs 10, 10 of the configuration shown in Fig. 1 are connected to each other in the longitudinal direction by a connecting member 19.

[0046] Here, the connecting member 19 can connect, for example, the other end (the right end in FIG. 7) of the withstand voltage test jig 10 on one side (the left side in FIG. 7) that are adjacent in the longitudinal direction to one end (the left end in FIG. 7) of the withstand voltage test jig 10 on the other side (the right side in FIG. 7). In this embodiment, the connecting member 19 is provided with insertion holes 19a, 19a that can receive the threaded portions 18a (18a1) of the connecting screws 18 located at both ends of each withstand voltage test jig 10, and nuts (not shown) are tightened with the threaded portions 18a1 inserted into these insertion holes 19a, 19a, thereby enabling the bases 11 of the withstand voltage test jig 10 to be connected to each other in the longitudinal direction. Therefore, by using this connecting member 19, it becomes possible to use a plurality of withstand voltage test jigs 10 each having a relatively small number of pairs of clamping pieces 12a, 12b (for example, 10 or less) to accommodate terminal blocks 1 having a variety of numbers of connection terminals 2. Furthermore, if the withstand voltage test jig 10 has a relatively small number of pairs of clamping pieces 12a, 12b, there is less risk of it interfering with the surroundings more than necessary, and therefore it can be used in any application location.

[0047] In the above embodiment, the withstand voltage test jig 10 is exemplified in which the base 11 is elongated and the pairs of clamping pieces 12a, 12b are arranged in a row, but of course other configurations are also possible. That is, the pair of clamping pieces 12a, 12b according to the present invention can be arranged in any manner as long as they are shaped in accordance with the arrangement of the connection terminals 2 and therefore the terminal screws in the terminal block 1 to which the jig is applied. [Explanation of symbols]

[0048] 1 Terminal block 2 Connection terminal 3a, 3b terminal screws 4 Bulkhead 10,20 Voltage resistance test fixture 11 Base 12a,12b Clamping piece 14 screw holes 15 Connecting part 16 Terminal screw clamping parts 17 through holes 18 Connecting screw 18a Threaded part 19 Connecting members 19a Insertion hole

Claims

1. A terminal block including a plurality of connection terminals and a plurality of terminal screws that can connect electric wires to the connection terminals by fastening to the connection terminals, or a jig used for a withstand voltage test of an electric device connected to the terminal block via the electric wires, A substrate formed of a conductor is provided, The voltage resistance test jig is provided with a plurality of pairs of clamping pieces formed of a conductor, extending from the base, and capable of clamping the head of the terminal screw at their tip sides.

2. 2. The voltage resistance test jig according to claim 1, wherein the pair of clamping pieces are connected to each other at their base ends via a connecting portion, and the connecting portion is detachably fixed to the base body.

3. 3. The voltage resistance test jig according to claim 2, wherein the pair of clamping pieces and the connecting portion are an integral part formed by bending both sides of a single long plate in the same direction.

4. 3. The voltage resistance test jig according to claim 1, wherein the distance between the pair of clamping pieces is narrower at the tip end side than at the base end side of the pair of clamping pieces.

5. A terminal block including a plurality of connection terminals and a plurality of terminal screws that can connect electric wires to the connection terminals by fastening to the connection terminals, or a component of a withstand voltage test jig used in a withstand voltage test of an electric device connected to the terminal block via the electric wires, a mounting portion formed of a conductor and mounted to a base of the withstand voltage test jig; A terminal screw clamping component of a voltage resistance test jig, comprising a pair of clamping pieces formed of a conductor, integrally provided with the attached portion, extending in the same direction from the attached portion, and capable of clamping the head of the terminal screw at their tip sides.

6. A method for short-circuiting the connection terminals of a terminal block including a plurality of connection terminals and a plurality of terminal screws that can connect electric wires to the connection terminals by fastening to the connection terminals, comprising: A substrate formed of a conductor is provided, A method for short-circuiting a terminal block, comprising: bringing a withstand voltage test jig, which is made of a conductor and has a plurality of pairs of clamping pieces that extend from the base and are capable of clamping the heads of the terminal screws at their tip sides, close to the head sides of the terminal screws; and clamping the heads of the corresponding terminal screws with each pair of clamping pieces.

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