JP2013127307A - Screw, and screw and nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw, which is simple in structure, low in price, can suitably be used as a fixed screw of a terminal base, and can surely connect an electric wire to the other electric wire without removing the connected electric wire, and a screw and a nut.SOLUTION: A screw 1 comprises a first male screw part 11 at its upper part, an upper/lower two-stage structure screw part having a second male screw part 13 at its lower part, and a fixed plate 15 in a boundary between the first male screw part 11 and the second male screw part 13. These items are integrally formed of metal materials such as steel materials. A recess 19 is formed at the head 17 of the first male screw part 11, an outside diameter of the fixed plate 15 is larger than an outside diameter of the second make screw part 13, and a step 23 is formed in a boundary between the fixed plate 15 and the second male screw part 13. When the second male screw part 13 is screwed to a female screw part, the step 23 functions as a head.

Description

  The present invention relates to a screw and a screw and nut, and more particularly to a screw and a screw and nut that can be suitably used for a terminal block.

  In a terminal block used for connecting electric wires in electrical equipment or the like, it is necessary to connect a measuring instrument when examining insulation of wired wires or examining signals flowing therethrough. In such a case, remove the wire from the terminal block and connect it to the measuring wire (lead wire) of the measuring instrument, or use the worm clip or crocodile clip provided at the tip of the measuring device lead wire. Many methods are used in which an electric wire and a lead wire of a measuring instrument are connected to each other by being sandwiched between the heads of fixed terminal block screws (hereinafter referred to as fixing screws). Hereinafter, a connection clip such as a worm clip or an alligator clip provided at the tip of the lead wire of the measuring instrument is referred to as a connection clip.

  Although the former method of removing the electric wire from the terminal block and connecting it to the lead wire of the measuring instrument is a reliable method, to remove the electric wire, it is necessary to turn off the power of the target electric wire. In addition, if there are a large number of target wires, it will take a lot of time to consider recovery. On the other hand, although the latter method can be easily connected, it is difficult to say that the connection clip is easily detached and is a reliable method.

  Many methods have been proposed to solve such problems. For example, a connection clip (see, for example, Patent Document 1) that is difficult to come off, a terminal block (see, for example, Patent Document 2) that includes a washer with a tongue for making it easy to attach the connection clip, There is a terminal block provided (see, for example, Patent Document 3). In addition, the present applicant has invented a connection clip that uses magnetic force and has been patented (see, for example, Patent Document 4), and further facilitates the connection between the terminal block terminal and the lead wire of the measuring instrument. A patent application is pending for the adapter (for example, see Patent Document 5).

Japanese Patent No. 3149147 JP 2006-324158 A JP 2007-294310 A Japanese Patent No. 4535843 JP 2011-179866 A

  The inventions described in Patent Documents 1 to 3 are devised that are harder to come off compared to conventional connection clips and terminal blocks, but are basically used with the connection clip sandwiched between them. The clip comes off. The connection clip described in Patent Document 4 uses magnetic force to connect to a fixing screw, but this clip also comes off when force is applied.

  In the measuring adapter described in Patent Document 5, a base plate having a mounting terminal for attaching a measurement lead wire is mounted on the front surface of the terminal block, the tip of the mounting terminal is brought into contact with the fixing screw of the terminal block, and the head of the mounting terminal Connect the connection clip or the crimp terminal of the measurement lead wire to. Since the male screw is provided on the head of the attachment terminal, the connection clip and the crimp terminal attached to the measurement lead wire can be firmly fixed with the male screw and the nut. The adapter for measurement described in Patent Document 5 is a preferred adapter that can be reliably connected to the measurement lead wire because it can be taken out in front of the connection part of the terminal block, but the terminal block is attached. This measuring adapter cannot be installed depending on the position and surrounding conditions. Moreover, the measurement adapter is composed of many members, and is not cheap.

  An object of the present invention is a screw that can be reliably connected to another electric wire without removing the connected electric wire, which can be suitably used as a fixing screw for a terminal block, is simple and inexpensive, and has a simple structure. And providing screws and nuts.

  The present invention has an upper and lower two-stage threaded portion having a stepped portion at the boundary between the upper first male threaded portion and the lower second male threaded portion, and a recess is provided at the upper end of the first male threaded portion. The outer diameter of the stepped portion is larger than the outer diameter of the second male screw portion.

  The screw according to the present invention has a screw portion having a two-stage upper and lower structure, and has a step portion larger than the outer diameter of the second male screw portion at the upper end of the lower second male screw portion. The head can be Therefore, the electric wire can be fixed by screwing the second male screw portion into the female screw portion. Since the upper first male screw portion is free in a state where the electric wire is fixed by the second male screw portion, another electric wire can be fixed here using a nut screwed into the first male screw portion. Thus, if the screw of the present invention is used, another electric wire can be reliably connected to this electric wire without removing this electric wire in a state where one electric wire is fixed. Since the structure is simple, it can be manufactured at low cost and can be suitably used as a fixing screw for the terminal block.

  In the screw of the present invention, the outer diameter of the first male screw portion is larger than the outer diameter of the second male screw portion in the screw, and the step portion is formed by the difference in the outer diameter. And

  The stepped portion can be easily formed by making the outer diameter of the first male screw portion larger than the outer diameter of the second male screw portion.

  In the screw of the present invention, in the screw, an outer diameter larger than an outer diameter of the first male screw part and an outer diameter of the second male screw part is formed at a boundary between the first male screw part and the second male screw part. A fixing plate is provided, and the step portion is formed by the second male screw portion and the fixing plate.

  The step portion at the boundary between the upper first male screw portion and the lower second male screw portion has a fixing plate having an outer diameter larger than an outer diameter of the first male screw portion and an outer diameter of the second male screw portion, It can be easily formed by providing it at the boundary between the first male screw portion and the second male screw portion.

  The present invention comprises the screw and a nut having a driving means provided on the top thereof, which is screwed into the first male screw portion of the screw, and an electric wire formed by the second male screw portion of the screw and the female screw portion to be screwed. Alternatively, in a state where the connection terminal is sandwiched and fixed, another electric wire or connection terminal is sandwiched and fixed using the first male screw portion and the nut, and the electric wire or connection terminal and the other electric wire or connection terminal can be connected. It is the screw and nut characterized by this.

  Unlike the conventional nut, the nut of the present invention is provided with a driving means at the top, and the screw and nut of the present invention have the first male threaded portion and the second male threaded portion fixed to the electric wire using the second male threaded portion. Since another electric wire can be fixed using the nut, it can be suitably used as a connecting screw for connecting a terminal block fixing screw and further two electric wires.

  The screw and nut of the present invention are a screw and nut for a terminal block, wherein the nut is provided with an insulating cover, and the driving means is provided at the top of the insulating cover. .

  Usually, a detachable transparent insulating cover is provided on the upper surface (front surface) of the terminal block. When an insulation test of the electric wire connected to the terminal block is performed using a megger, it is performed with the insulating cover removed, but this is not preferable in consideration of a short circuit accident or the like. Since the nut of the present invention is provided with an insulating cover, it can be safely operated even with the terminal block insulating cover removed, and is very preferable as a screw and nut for the terminal block.

  Since the screw of the present invention has a screw part of a two-stage structure with a step part formed in the middle, the electric wire is fixed using the step part as a head of the second male screw part, and the other using the first male screw part. Can be fixed. For this reason, another electric wire can be reliably connected to this electric wire, without removing the fixed electric wire. The screw of the present invention can be manufactured at a low cost with a simple structure, and the screw and the screw and nut of the present invention can be suitably used as a terminal block fixing screw and a fixing screw and nut.

It is a perspective view of screw 1 as one embodiment of the present invention. It is a perspective view which shows the state which used the screw 1 of FIG. 1 as a fixing screw of the terminal block 51. FIG. It is sectional drawing which uses the screw 1 of FIG. 1 as a fixing screw of the terminal block 51, and also shows the state which connected the other electric wire. It is the top view and sectional drawing of the nut 32 as one Embodiment of this invention. It is the top view and sectional view of nut 33 which are other embodiments of the present invention. It is a front view of screw 2 which is other embodiments of the present invention. It is a front view of screw 3 which is other embodiments of the present invention. It is a front view of screw 4 which is other embodiments of the present invention.

  FIG. 1 is a perspective view of a screw 1 as an embodiment of the present invention. 2 is a perspective view showing a state in which the screw 1 of FIG. 1 is used as a fixing screw for the terminal block 51. FIG. 3 shows a state in which the screw 1 of FIG. It is sectional drawing which shows the state which connected the electric wire. Hereinafter, the case where the screw 1 is used as a fixing screw of the terminal block 51 will be described as an example.

  The screw 1 has an upper and lower two-stage screw portion having a first male screw portion 11 at the upper portion and a second male screw portion 13 at the lower portion, and a fixing plate 15 at the boundary between the first male screw portion 11 and the second male screw portion 13. These are integrally formed of a metal material such as steel, stainless steel, or brass. You may manufacture using a synthetic resin depending on a use place and a use purpose.

  The screw 1 has a first male screw portion 11 all above the fixing plate 15 and a second male screw portion 13 all below the fixing plate 15, and the entire surface is male screwed except for the fixing plate 15. The bottom of the screw 1 is flat like a normal screw. The first male screw portion 11 and the second male screw portion 13 have the same outer diameter and screw pitch. The outer diameters and lengths of the first male screw portion 11 and the second male screw portion 13 are not limited to specific sizes and lengths, and can be appropriately determined according to the purpose of use and the use destination. The outer diameter of the fixing plate 15 is larger than the outer diameters of the first male screw portion 11 and the second male screw portion 13, and a step is formed at the boundary between the first male screw portion 11 and the fixing plate 15, and the second male screw portion 13 and the fixing plate 15. Portions 21 and 23 are formed.

  The upper end of the first male screw portion 11 is a pan-shaped head portion 17, and the head portion 17 is provided with a cross-shaped recess 19 that is locked by a driver. What is important here is that a nut 31 to be screwed into the first male screw portion 11 is screwed from the head 17 side, and an electric wire, a washer or the like is sandwiched and fixed between the bottom surface 34 of the nut 31 and the upper surface 25 of the fixing plate 15. For this reason, the outer diameter of the head 17 must be the same as or smaller than the outer diameter of the first male screw portion 11. In the case of a normal screw, the outer diameter of the head is larger than the outer diameter of the male screw portion in order to fix the electric wire, washer, etc. on the bottom surface of the head, but such a configuration cannot be adopted. In addition, you may provide the recess 19 directly in the upper end of the 1st external thread part 11, without providing the pan-shaped head 17. FIG. The shape of the recess 19 is not limited to a specific shape, and a known shape can be used.

  The fixing plate 15 is provided so as to be orthogonal to the screw portion, and a step portion 23 is formed between the fixing plate 15 and the second male screw portion 13. The screw 1 uses the step portion 23 to fix an electric wire or the like. Specifically, the second male screw portion 13 is screwed into a female screw portion to be screwed, and an electric wire, a washer or the like is sandwiched and fixed between the bottom surface 27 of the fixing plate 15 and the member having the female screw portion. For this reason, the outer diameter of the fixing plate 15 must be larger than at least the outer diameter of the second male screw portion 13. The outer diameter of the fixing plate 15 only needs to be larger than the outer diameter of the second male screw portion 13, and can be appropriately determined according to the size of the electric wire and washer to be fixed, and the usage destination. The thickness of the fixing plate 15 is not limited to a specific thickness as long as it has a strength that does not deform during use. The shape of the fixing plate 15 is not limited to a circle, and a rectangular or hexagonal shape can be used according to the purpose of use and the use destination. From the viewpoint of ease of manufacture and cost, the shape of the fixing plate 15 is preferably a circle.

  An example of using the screw 1 will be described as an example in which the screw 1 is used as a fixing screw for the terminal block 51. In addition, the nut 31 that is screwed into the first male screw portion 11 will be described. The terminal block 51 used here is a terminal block generally used conventionally. A crimping terminal 65 attached to the distal end portion of the spring washer 61 and the electric wire 63 is inserted into the second male screw portion 13 of the screw 1, and the second male screw portion 13 is connected to the female screw portion provided in the connection fitting 53 of the terminal block 51. Screwing is performed, and the electric wire 63 is fixed to the terminal block 51 (see FIGS. 2 and 3). When screwing in the screw 1, a recess 19 provided in the head 17 of the first male screw portion 11 is used. If the fixing plate 15 is considered as the head of the second male screw portion 13, the portions of the fixing plate 15 and the second male screw portion 13 are the same as ordinary screws.

  When the screw 1 is used as a fixing screw for the terminal block 51, the first male screw portion 11 protrudes and is in a free state. Therefore, the first male screw portion 11 is used to make another electric wire, for example, a measurement lead wire 67 of a measuring instrument. Can be fixed. In order to fix the measurement lead 67 to the first male thread 11, the spring washer 69 and the crimp terminal 71 at the tip of the measurement lead 67 are inserted into the first male thread 11 and screwed into the first male thread 11. The nut 31 is tightened and fixed. Thereby, the measurement lead wire 67 and the electric wire 63 can be reliably connected. Instead of the spring washers 61 and 69, washers (not shown) may be used, and both the spring washers 61 and 69 and washers (not shown) may be used. This can be considered in the same way as a conventional screw.

  When the screw 1 is used as a fixing screw for the terminal block 51, the length of the first male screw portion 11 of the screw 1 should not be increased unnecessarily. In the case of the terminal block 51, a transparent insulating cover (not shown) is attached to the upper surface (front surface) 55 of the terminal block 51. Therefore, if the length of the first male screw portion 11 of the screw 1 is too long, the transparent insulating cover Touching the head 17 makes it impossible to attach the transparent insulating cover.

  The nut 31 can be a conventionally used hexagonal nut or a flanged hexagonal nut. However, when the nut 31 is used for the terminal block 51, the insulating walls 57a and 57b are erected on the left and right sides. In some cases, a nut driver cannot be used to tighten the nut 31. In such a case, a nut 31 having a height such that the head (top) 35 of the nut 31 becomes higher than the head 17 of the screw 1 when the nut 31 is tightened is used. A drive groove 37 capable of locking the driver may be provided in 35. If such a nut 31 is used, it can be easily tightened with a driver using the drive groove 37.

  Furthermore, the nut of other embodiment of this invention is shown in FIG. (A) is a plan view of the nut 32, and (B) is a cross-sectional view of the nut 32. The nut 32 is provided with an insulating cover 41 so as to cover the side surface and the upper surface of the hex nut body 39. A cross-shaped drive groove 45 for driving the nut 32 is provided on the head (top) 43 of the insulating cover 41. The drive groove 45 corresponds to a recess provided in the head of the screw. By using the drive groove 45, the nut 32 can be tightened or loosened with a screwdriver. Note that a single groove may be used instead of the cross-shaped drive groove 45, and a groove on which the driver is surely hooked is preferable.

  Furthermore, the nut of other embodiment of this invention is shown in FIG. (A) is a plan view of the nut 33, and (B) is a cross-sectional view of the nut 33. The same members as those of the nut 32 shown in FIG. The basic structure of the nut 33 is the same as that of the nut 32, and a bar-like protrusion 47 is provided on the head 43 instead of the cross-shaped drive groove 45. The projection 47 is used when the nut 33 is tightened or loosened, and can be easily gripped by a hand or a tool such as pliers to rotate the nut 33 easily. The shape of the protrusion 47 may be other shapes as long as it is a shape that can be easily grasped by a hand or a tool such as pliers.

  The nuts 32 and 33 shown in FIGS. 4 and 5 are covered with the insulating cover 41 on the side surfaces and the upper surface. Therefore, even when the transparent insulating cover of the terminal block 51 is removed, the nuts 32 and 33 can be safely operated without fear of a short circuit. Can do. In the nuts 31, 32, and 33 shown in the present embodiment, the drive grooves 37 and 45 and the protrusions 47 correspond to nut driving means.

  FIG. 6 is a front view of a screw 2 according to another embodiment of the present invention. The same reference numerals are given to the same components as those of the screw 1 shown in FIGS. The screw 2 shown in FIG. 6 has the upper and lower two-stage screw part having the first male screw part 11 on the upper part and the second male screw part 13 on the lower part, like the screw 1 shown in FIGS. Unlike the screw 1 shown in FIG. 3, the fixing plate 15 is not provided at the boundary between the first male screw portion 11 and the second male screw portion 13. Instead, the outer diameter of the first male screw portion 11 is larger than the outer diameter of the second male screw portion 13, whereby a step portion 23 is formed at the boundary between the first male screw portion 11 and the second male screw portion 13. This level | step-difference part 23 fulfill | performs the function similar to the fixing plate 15 of the screw 1 shown in FIGS. While the outer diameter of the stepped portion 23 of the screw 1 shown in FIGS. 1 to 3 is the outer diameter of the fixing plate 15, the outer diameter of the stepped portion 23 of the screw 2 shown in FIG. 11 outer diameter.

  The method of using the screw 2 is basically the same as that of the screw 1 shown in FIGS. When the second male screw portion 13 is screwed into the female screw portion of the terminal block 51 and the electric wire 63 is fixed, if the difference in outer diameter between the first male screw portion 11 and the second male screw portion 13 is small and the step portion 23 is small, the washer By using, the electric wire can be firmly fixed. What is necessary is just to determine the magnitude | size of the level | step-difference part 23 suitably according to a use purpose and a use place. Since the screw 2 of the present embodiment does not need to be provided with the fixing plate 15, the overall length can be shortened. The structure is simple and easy to manufacture.

  FIG. 7 is a front view of a screw 3 according to still another embodiment of the present invention. The screw 3 shown in FIG. 7 has a configuration in which the screw 1 shown in FIGS. 1 to 3 and the screw 2 shown in FIG. 6 are combined. The screw 3 has the same configuration as that of the screw 1 shown in FIGS. 1 to 3 except that the outer diameter of the first male screw portion 11 is larger than the outer diameter of the second male screw portion 13, and the usage method is also the same. The same. The screw 3 shown in FIG. 7 has a large outer diameter of the upper first male screw portion 11 and further includes a fixing plate 15, so that an electric wire or the like can be firmly fixed.

  FIG. 8 is a front view of a screw 4 according to still another embodiment of the present invention. The screw 4 shown in FIG. 8 has a form similar to that of the screw 3 shown in FIG. 7, but the outer diameter of the first male screw portion 11 is set to be the outer diameter of the second male screw portion 13, contrary to the screw 3 shown in FIG. 7. It is small compared. Except for this part, other configurations are the same as the screw 1 shown in FIGS. 1 to 3 and the screw 3 shown in FIG. 7, and the usage is the same. When the screw 4 is used as a fixing screw for the terminal block 51, the electric wire fixed to the first male screw portion 11 is fixed by the nut 31. In the case of the terminal block 51, since the insulating walls 57a and 57b are provided on both sides, the space is small. However, since the outer diameter of the first male screw portion 11 is small, the nut 31 can be easily attached.

  Since the basic functions of the screws 1, 2, 3, and 4 shown in the above embodiment are the same, if the preferred screws 1, 2, 3, and 4 are appropriately selected according to the purpose of use and the situation when used. Good. The nuts 31, 32, and 33 may be appropriately selected according to the purpose of use and the situation when used.

  As described above, the screws 1, 2, 3, and 4 of the present invention are provided with the step portion 23 at the boundary between the upper first male screw portion 11 and the lower second male screw portion 13, and By making the outer diameter larger than the outer diameter of the second male screw portion 13, the stepped portion 23 can function as the head of the second male screw portion 13. Thereby, one electric wire can be fixed using the 2nd male screw part 13, other electric wires can be fixed using the 1st male screw part 11, and these electric wires can be connected. The nuts 31, 32, 33 are also easy to use because they are provided with driving means for rotating the nuts 31, 32, 33 at the top. If the screws 1, 2, 3, 4 of the present invention are used as fixing screws for the terminal block 51, the electric wire and the measurement lead wire can be easily and reliably connected without modifying the existing terminal block 51. . Further, it is possible to use the screws 1, 2, 3, and 4 only at necessary portions of the terminal block 51, which is convenient. In addition, this invention is not limited to the said embodiment, It can change and use in the range which does not change a summary. Moreover, in the said embodiment, although the example which uses the screw 1, 2, 3, 4 as a fixing screw of the terminal block 51 was shown, the screw 1, 2, 3, 4 of this invention is other than the fixing screw of the terminal block 51. Needless to say, it can be used for various purposes.

1, 2, 3, 4 Screw 11 First male screw portion 13 Second male screw portion 15 Fixing plate 17 Screw head 19 Recess 23 Step portions 31, 32, 33 Nut 35 Nut head 37 Drive groove 39 Nut body 41 Insulation cover 43 Insulation cover head 45 Drive groove 47 Projection 51 Terminal block 63 Electric wire 67 Measurement lead wire

Claims (5)

The upper male screw part has a top and bottom two-stage screw part provided with a step part at the boundary between the first male screw part and the lower second male screw part, and a recess is provided at the upper end of the first male screw part,
The screw characterized in that an outer diameter of the stepped portion is larger than an outer diameter of the second male screw portion.   2. The screw according to claim 1, wherein an outer diameter of the first male screw portion is larger than an outer diameter of the second male screw portion, and the step portion is formed by a difference in the outer diameter.   A fixing plate having an outer diameter larger than an outer diameter of the first male screw part and an outer diameter of the second male screw part is provided at a boundary between the first male screw part and the second male screw part, and the second male screw The screw according to claim 1 or 2, wherein the step portion is formed by a portion and the fixing plate. The screw according to any one of claims 1 to 3,
It consists of a nut that is screwed into the first male threaded portion of the screw and that is provided with a driving means at the top,
In a state where the electric wire or the connection terminal is sandwiched and fixed between the second male screw portion of the screw and the female screw portion to be screwed together, the other electric wire or the connection terminal is sandwiched and fixed using the first male screw portion and the nut, A screw and nut capable of connecting an electric wire or connecting terminal and the other electric wire or connecting terminal. Screws and nuts for terminal blocks,
The screw and nut according to claim 4, wherein the nut is provided with an insulating cover, and the driving means is provided on a top portion of the insulating cover.

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