Source: https://patents.google.com/patent/JP2013054882A/en
Timestamp: 2020-04-01 20:57:04
Document Index: 287001752

Matched Legal Cases: ['art 23', 'art 13', 'arts 13', 'art 13', 'art 13', 'art 14', 'art 20', 'art 25']

JP2013054882A - Screw terminal base - Google Patents
Screw terminal base Download PDF
JP2013054882A
JP2013054882A JP2011191670A JP2011191670A JP2013054882A JP 2013054882 A JP2013054882 A JP 2013054882A JP 2011191670 A JP2011191670 A JP 2011191670A JP 2011191670 A JP2011191670 A JP 2011191670A JP 2013054882 A JP2013054882 A JP 2013054882A
JP2011191670A
Yoshiichi Kitajima
芳一 北嶋
Fumihiko Hikita
文彦 疋田
寿弘 畠山
Kyoshin Kogyo Co Ltd
2011-09-02 Application filed by Kyoshin Kogyo Co Ltd, 協伸工業株式会社 filed Critical Kyoshin Kogyo Co Ltd
2011-09-02 Priority to JP2011191670A priority Critical patent/JP2013054882A/en
2013-03-21 Publication of JP2013054882A publication Critical patent/JP2013054882A/en
PROBLEM TO BE SOLVED: To provide a screw terminal base which has a structure in which, even if a foreign material occurs at the time of tightening operation of a screw, it is captured and collected to prevent flying of it to the periphery, while reinforcement of the structure is promoted.SOLUTION: A screw terminal base (1A) includes a metal screw terminal body (10) which contains a plate-like top surface part (12) equipped with a threaded hole (14a) in which a male screw for connecting an external terminal is screwed and a pair of legs (13 and 13) which are suspended from the top surface part respectively, with a projection (13p) inserted in an insertion hole of an external circuit board provided to a tip end, and an insulating resin holder (20) which is sandwiched between the pair of legs to support the screw terminal body. The resin holder (20) includes a body part which is a hollow tube as a whole and has a center hole (26) which is provided to correspond to the threaded hole of the screw terminal body, having an inside diameter larger than that of the threaded hole, and a closing wall (25) which is provided in the center hole (26) to act as a bottom of the center hole.
The present invention relates to a screw terminal block mounted on a circuit board and used for electrical connection with a connection terminal (external terminal) of an external electronic device or the like.
A screw terminal block is used as an electrical component for connecting an external terminal to a circuit board such as a printed board. As such a screw terminal block, for example, as disclosed in Patent Document 1, a structure in which a metal terminal portion is attached to a terminal block body (resin holder) formed of resin or the like is known. Yes. In such a terminal block, for example, the lower end side of the metal terminal portion is connected to a printed circuit board prepared in advance or an interface portion on the apparatus side. Then, by tightening a fastening screw (male screw) into a screw hole (female screw) provided on the upper end side, an external terminal such as a round terminal can be fixed to form an electrical connection.
JP 2008-226633 A
The screw terminal block of the type that fixes the external terminal with the screw exemplified in the cited document 1 has been widely used since it can fix various types of terminals by tightening the screw. In addition, there are various forms of screw terminal block, when the opening for the metal terminal plate plate is subjected to burring tap processing, and a female screw is provided at the rising portion to form a screw hole, A nut prepared separately may be fixed at a predetermined position to form a screw hole.
Naturally, in order to realize a tightening structure using screws, a screw hole (female screw portion) and a screw (male screw portion) inserted into the screw hole are required. And when the said screw hole and screw are formed, the screw terminal block as a product is provided, after the unnecessary metal remaining parts, such as cuttings and a burr | flash which generate | occur | produced at the time of manufacture, are removed.
However, when the screw terminal block was actually used and the screws were set in the screw holes and tightened, the remaining parts that could not be completely removed, or metal powder such as plating powder peeled off due to the tightening, were removed. In some cases, the foreign matter may fall out of the screw hole or screw. Since such a foreign substance is conductive, if it is deposited on the circuit of the printed circuit board on which the terminal block is fixed, it may cause an accident such as a short circuit.
The present invention has been made in order to solve the above-described problems. The object of the present invention is to reinforce the structure with a resin holder, and even if foreign matter falls off during screw tightening operation. An object of the present invention is to provide a screw terminal block having a structure that captures and collects this to prevent scattering to the periphery.
The above-mentioned purpose has a female screw, a plate-shaped top surface part into which a male screw for connecting an external terminal to this female screw is screwed, and a hanging from the top surface part, and an external circuit board at the tip A metal screw terminal main body having a pair of leg portions provided with protrusions to be inserted into the insertion holes, and an insulating resin sandwiched between the pair of leg portions to support the screw terminal main body A screw terminal block comprising a holder,
The resin holder has a generally hollow cylindrical shape, a body portion provided corresponding to the female screw of the screw terminal main body and having a center hole having an inner diameter larger than the inner diameter of the female screw; The screw terminal block is characterized in that it has a closing wall that provides a bottom to the center hole (claim 1).
The screw terminal body has a height of the leg length L that is twice or more the width W when the width of the top surface portion defined between the leg portions is W and the leg length of the leg portion is L. It may be a back shape (claim 2).
In addition, it is desirable that the resin holder further includes a tongue piece portion that contacts the leg portion from the outside at an intermediate position of the leg portion.
The female screw may employ a structure formed on an inner surface of a burring portion provided on the top surface portion of the screw terminal body.
The screw terminal main body is bent between the top surface portion and the pair of leg portions and is formed in a substantially U shape in a side view, and is not attached to the burring portion at the bent portion. It is preferable to use a structure provided with a through hole for bending.
Further, the screw terminal block is configured as a nut built-in type in which the screw terminal main body has a nut having the female screw on the lower surface of the top surface portion, and the nut is restricted from rotating in the resin holder. The resin holder may be housed in a state where a part of the resin holder is fitted to the leg portion (Claim 6).
In addition, the screw terminal block is configured in a nut built-in type including a nut having the female screw exposed from the top surface portion while the screw terminal body is press-fitted into the top surface portion and rotation is restricted. The nut may be covered with the resin holder from below, and a part of the resin holder may be fitted to the leg portion (Claim 7).
It is desirable that the top surface portion is provided with a claw portion for preventing the external terminal connected to the top surface portion from rotating (Claim 8).
In the screw terminal block of the present invention, an insulating resin holder that is disposed between the pair of leg portions and supports the screw terminal body is under the female screw provided on the top surface of the metal screw terminal body. positioned. The resin holder is a hollow cylindrical body and has a blocking wall in the center hole (inside the cylinder). Therefore, even if a metal foreign object is generated when the male screw is tightened into the female screw, it can be stored in a cylindrical resin holder to prevent scattering to the surroundings, so that a short circuit etc. Accidents can be prevented.
It is a disassembled perspective view of the screw terminal block which concerns on the 1st form of this invention. It is the figure which showed typically a mode that the screw terminal block shown in FIG. 1 was attached to an external circuit board, and an external terminal was attached. It is the figure shown in order to demonstrate the merit about the case where the screw terminal block shown in FIG. 1 is comprised especially in a high profile type. It is the figure shown about the screw terminal block which concerns on the 2nd form of this invention. It is the figure shown about the screw terminal block which concerns on the 3rd form of this invention.
FIG. 1 is an exploded perspective view of a screw terminal block 1A according to the first embodiment.
The screw terminal block 1 </ b> A is formed by assembling a resin holder 20 to a metal screw terminal body 10.
As a material for forming the screw terminal main body 10, a conductive metal plate-like material is adopted, and for example, copper and copper alloy plates are suitable. Then, tin plating or the like may be applied to the surface of the screw terminal body 10 formed of these materials as necessary.
The screw terminal main body 10 illustrated on the upper side in FIG. 1 includes an upper top surface portion 12 and a pair of leg portions 13 and 13 extending therefrom, and is substantially U-shaped in a side view. The top surface portion 12 is provided with an opening 11 into which a male screw for connecting an external terminal and the screw terminal main body 10 (a terminal and a male screw are not shown) is fitted. A pair of leg portions 13, 13 hang down from positions at which the end edges of the top surface portion 12 face each other. Protrusions 13p that are inserted into insertion holes (or conductive through holes) of an external circuit board are provided at the tips of these leg portions 13 and 13, and the screw terminal body 10 is electrically connected to the conductor pattern of the circuit board. Connectable. The top surface portion 12 illustrated in FIG. 1 has a rectangular shape (rectangular shape), and leg portions 13 and 13 are suspended from each of a pair of sides parallel to each other.
The opening 11 is subjected to burring tap processing, and a burring portion 14 is provided as an annular wall downward from the top surface portion 12. The burring portion 14 is formed with a female screw 14a that meshes with the male screw.
The screw terminal main body 10 described above is formed in a substantially U-shape including a top surface portion 12 and a pair of leg portions 13 and 13 by bending a long metal member. Therefore, in order to form the screw terminal body 10 bent in a U-shape at a position not hanging on the burring portion 14, the metal member is penetrated through a portion that becomes the base portion 15 of the leg portion 13 for bending. A small hole 16 is provided. When such a small hole 16 is provided and bending is performed, the bending position can be ensured, and a smooth bending process can be performed as compared with the case where no small hole is provided, and a well-shaped U-shape can be formed.
FIG. 1 illustrates a so-called high-profile screw terminal block. The screw terminal body 10 shown in the figure is, for example, a tall profile whose leg length L is twice or more the width W when the width between the leg portions 13 and 13 of the top surface portion 12 is W and the leg length of the leg portion 13 is L. As a type. Advantages of the screw terminal block in the case of such a high profile will be described later.
Next, the resin holder 20 shown on the lower side of FIG. 1 will be described.
The resin holder 20 can be obtained by molding a resin material having electrical insulation properties and excellent heat resistance, dimensional stability, moldability and the like into a predetermined shape using a mold. As the resin material, for example, based on polybutylene terephthalate (PBT) and reinforced with glass fiber as necessary can be suitably employed.
The resin holder 20 is disposed so as to be sandwiched between the pair of leg portions 13 and 13 on the screw terminal body 10 side described above, and serves as a reinforcing structure for supporting the screw terminal body. The resin holder 20 is formed in a hollow cylindrical body having a center hole 26 extending in the vertical direction. More specifically, in the case of illustration, the main body portion 21 sandwiched between the leg portions 13 and 13 is a rectangular cylindrical body, and the pair of external measurement surfaces 21a and 21b parallel to each other of the main body portion correspond to the corresponding legs. The portion 13 is configured in a concave groove shape capable of receiving.
The main body 21 is basically a hollow cylindrical body from the viewpoint of reducing the amount of resin material used and ensuring the required strength, but a blocking wall 25 is provided in the center hole 26. In FIG. 1, the position of the blocking wall 25 is indicated by a broken line BL. The blocking wall 25 is different from the case where the above-mentioned metal foreign matter falls when the male screw is screwed into the female screw 14a and enters from the top into the center hole 26 opened upward. It functions as a hole 26, that is, a bottom to be retained (collected and retained) in the main body 21. The center hole 26 is located immediately below the opening 11, that is, on the same axis as the female screw 14 a when the resin holder 20 is assembled to the screw terminal main body 10. The opening area is larger than the opening area. Therefore, in the present embodiment, the center hole 26 of the main body portion 21 can receive the burring portion 14.
The resin holder 20 provided with the closing wall 25 can be easily manufactured using a molding die. For example, when the cylindrical resin holder 20 illustrated in FIG. 1 extends in the vertical direction and has a blocking wall 25 at an intermediate position (see reference numeral BL), the front and rear (posture illustrated in FIG. 1) Then, if a split mold of the type that is pulled out vertically is used, the blocking wall 25 can be easily formed therebetween. From the viewpoint of preventing the collected foreign matter from jumping out to the outside again, it is desirable to arrange the blocking wall 25 with a certain depth (with a certain length from the upper end of the center hole 26). . For example, it is desirable to set the blocking wall 25 below the intermediate position in the height direction in which the resin holder 20 extends.
Further, a structure that is more preferably adopted will be described.
A positioning hole 13 h for positioning is formed in the leg portion 13 of the illustrated screw terminal body 10. Correspondingly, positioning protrusions 21p (the 21b side is not shown) are provided on the outer side surfaces 21a and 21b of the resin holder 20. Therefore, the screw terminal body 10 can be reliably set at a predetermined position of the resin holder 20 and assembled by fitting the positioning special machine 21p corresponding to the positioning hole 13h.
Further, the resin holder 20 is brought into contact with the corresponding leg portion 13 from the outside in the middle of the leg portions 13 and 13 in the longitudinal direction of the leg portions 13 and 13 on the outer side surfaces 21a and 21b side, and presses the leg portion 13. It is desirable to have a structure further provided with a tongue piece portion 23. Since the tongue piece portion 23 holds the leg portion 13 from the outside, the screw terminal body 10 and the resin holder 20 can be integrated to provide a more durable screw terminal block.
And in the case of illustration, the tongue piece part 23 is provided corresponding to the position which provided the processus | protrusion 21p. Therefore, when the positioning hole 13h provided in the leg part 13 comes to the position which fits the protrusion 21p of the resin holder 20, the firm fixing structure which suppresses the leg parts 13 and 13 from the top is formed. Therefore, the structure illustrated here implements a structure in which the screw terminal body 10 is reliably positioned with respect to the resin holder 20 and the screw terminal body 10 is firmly reinforced with the resin holder.
Further, the top surface portion 12 is provided with a claw portion 17 for preventing rotation so that an external terminal connected to the top surface portion 12 does not rotate unnecessarily. Here, the case where the claw portions 17 are provided at the four corners is illustrated, but the number may be one or two or three depending on the external terminal to be connected.
FIG. 2 shows that the assembled screw terminal block 1A is attached (set) to an external circuit board 100, and the external terminal is connected to the opening 11 of the top surface portion 12 of the screw terminal body 10, that is, the female screw 14a. It is the figure which showed typically a mode that attached.
The left side of FIG. 2 shows how the protrusion 13p of the leg portion 13 of the screw terminal block 1A is inserted into the insertion hole (or conductive through hole) of the circuit board 100. However, in FIG. 2, illustration of a conductor pattern is abbreviate | omitted and only the insertion hole 110 provided in the circuit board 100 is shown in figure.
The right side of FIG. 2 shows a state in which a round terminal 200 as an external terminal is fastened with a male screw (fastening screw) 210 to the screw terminal block 1A after being set on the circuit board 100.
In this tightening operation, the male screw 210 is screwed into the female screw 14 a of the opening 11. At this time, even if the above-mentioned metal foreign matter falls into the center hole 26 of the resin holder 20 from the screwed portion, such a fallen foreign matter is received by the blocking wall 25 in the resin holder 20. And retained. Therefore, it is possible to prevent a situation where the fallen foreign matter is scattered around the screw terminal block 1A, contaminating the circuit board 100 or short-circuiting the circuit board 100.
FIG. 3 is a view shown in order to explain the merit of the case where the screw terminal block 1A is configured to be particularly tall as described above. In addition, as an external terminal connected to the screw terminal block 1A, a bus bar or the like can be connected in addition to the general round terminal described above.
Further, in FIG. 3, a high-profile screw terminal block 1A according to the present invention is shown on the right side, and a conventional screw terminal block 300 is shown on the left side for comparison.
In the case of the conventional screw terminal block 300, since there is no auxiliary structure of the resin holder, there is a limit to the height. Therefore, if there is a high-profile component 310 such as a capacitor on the circuit board 100, the bus bar 120 needs to be bent and handled as shown.
On the other hand, in the case of the screw terminal block 1A having a high profile according to the present invention, the bus bar 120 can be arranged straight in a position beyond the high profile component 310 as shown on the right side of FIG. Can be connected efficiently.
As is clear from the above description, the screw terminal block 1A shown in FIGS. 1 to 3 does not drop the foreign matter in the resin holder 20 even if the metallic foreign matter falls. Can be recovered and held, so that scattering to the surroundings can be prevented and problems such as short circuits can be prevented. Further, when the leg length of the leg portion 13 is L, when the leg length L is a high profile type that is twice or more the width W, there is a high profile component on the circuit board 100. Even in this case, it is easy to connect to external terminals. Although depending on the size of the male screw used, for example, the width W is generally about 10 mm. On the other hand, when the leg length L of the U-shaped screw terminal block is 20 mm or more (that is, when the leg length L is twice or more the width W), the conventional screw terminal block is tightened with the specified torque. Then there was a possibility of deformation. However, since the screw terminal block according to the present invention includes the auxiliary structure of the resin holder, it can be a high-profile type in which the leg length L is twice or more the width W.
Furthermore, with reference to FIG. 4, the screw terminal block 1B which concerns on a 2nd form is demonstrated. The screw terminal block 1B shown in FIG. 4 also has the same basic structure as the screw terminal block 1A described above. That is, it is composed of a metal screw terminal body 30 and an insulating resin holder 40 that supports the screw terminal body 30, and the resin holder 40 has a structure with a blocking wall that prevents foreign matter from falling. The feature point is the same. Therefore, even if the work of tightening the male screw to connect the external terminal and the metal foreign object falls, problems such as contamination and short circuit can be prevented as in the case of the screw terminal block 1A.
The screw terminal block 1A according to the first embodiment described above has a female screw formed in the burring portion, but the screw terminal block 1B according to the second embodiment uses a nut as a female screw in the screw terminal block 1B according to the second embodiment. It is.
4A to 4D show a series of steps from assembling the screw terminal block 1B to connecting it to the circuit board 100. FIG. FIG. 4A shows a state in which a nut 41 that functions as a female screw of the screw terminal block 1B is housed in the resin holder 40 in a state in which the rotation is restricted. FIG. 4B shows a state in which the resin holder 40 that houses the nut 41 is fitted between the leg portions 33 of the screw terminal body 30. The opening 31 provided in the top surface portion 32 of the screw terminal main body 30 allows the male screw to pass therethrough. In other words, the male screw 210 fitted in the opening 31 meshes with the nut 41 disposed below the opening 31.
A pair of outer side surfaces 43 of the resin holder 40 sandwiched between the leg portions 33 of the screw terminal main body 30 are provided with fitting projections 44, respectively. Correspondingly, a notch 34 is formed on the leg 33 side to be fitted with the protrusion 44.
4C and 4D, the screw terminal block 1B is also set on the circuit board 100, and the male screw 210 is screwed into the nut 41 through the opening 31, so that external terminals ( Here, not shown) can be electrically connected to the screw terminal block 1B.
FIG. 4 (e) shows a cross section of the screw terminal block 1B. The resin holder 40, which is a substantially cylindrical body, has a closing wall 45 at the lower end. Therefore, even if the work of tightening the male screw to connect the external terminal and the metal foreign object falls, problems such as contamination and short circuit can be prevented as in the case of the screw terminal block 1A.
Furthermore, with reference to FIG. 5, 1 C of screw terminal blocks which concern on a 3rd form are demonstrated. The screw terminal block 1C is a modification of the screw terminal block 1B. That is, the screw terminal block 1C is also a nut built-in type screw terminal block using a nut as a female screw.
Hereinafter, a description will be given focusing on differences from the screw terminal block 1B. FIGS. 5A to 5D show a series of steps from assembling the screw terminal block 1C to connecting to the external circuit board. FIGS. 5A and 5B show a state in which a nut 61 that functions as a female screw is rotationally restricted and press-fitted into an opening 51 provided in the top surface portion 52 of the screw terminal body 50. Thereafter, the nut 61 is covered with a resin holder 60 from below. In the case of this screw terminal block 1C, the nut 61 located in the opening 51 functions as a female screw.
Other configurations are the same as those of the screw terminal block 1B shown in FIG. That is, FIG. 5 (e) shows a cross section of the screw terminal block 1C, and the resin holder 60, which is a generally cylindrical body, also has a closing wall 65 at the lower end thereof. Therefore, even if the work of tightening the male screw to connect the external terminal and the metal foreign object falls, the occurrence of contamination or short circuit can be prevented as in the case of the screw terminal block 1A.
The screw terminal blocks 1B and 1C shown in FIGS. 4 and 5 can form a terminal block that functions similarly by diverting existing nuts without subjecting the openings to burring tap processing.
Although the description of the embodiment has been completed above, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the scope of the invention.
DESCRIPTION OF SYMBOLS 1 (1A, 1B, 1C) Screw terminal block 10 Screw terminal main body 11 Opening 12 Top surface part 13 Leg part 13p Protrusion 14 Burring part 14a Female screw 17 Nail | claw part 20 Resin holder 23 Tongue piece part 25 Closure wall 26 Center hole 30, 50 Screw terminal body 40, 60 Resin holder 41, 61 Nut 100 External circuit board 210 Male screw
It has a female screw, a plate-shaped top surface part into which a male screw for connecting an external terminal to this female screw is screwed, and a hanging from the top surface part, and is inserted into the insertion hole of the external circuit board at the tip A metal screw terminal body having a pair of leg portions provided with protrusions to be provided;
A screw terminal block comprising an insulating resin holder that is sandwiched between the pair of legs and supports the screw terminal body,
The resin holder has a generally hollow cylindrical shape, a body portion provided corresponding to the female screw of the screw terminal main body and having a center hole having an inner diameter larger than the inner diameter of the female screw; A screw terminal block, characterized in that the screw terminal block has a closing wall provided at the center hole and providing a bottom to the center hole.
The screw terminal main body is a high-profile type in which the leg length L is twice or more the width W when the width of the top surface portion defined between the leg portions is W and the leg length of the leg portion is L. The screw terminal block according to claim 1, wherein:
The screw terminal block according to claim 2, wherein the resin holder further includes a tongue piece portion that contacts the leg portion from the outside at an intermediate position of the leg portion.
4. The screw terminal block according to claim 1, wherein the female screw is formed on an inner surface of a burring portion provided on the top surface portion of the screw terminal main body. 5.
The screw terminal main body is bent between the top surface portion and the pair of leg portions, is formed in a substantially U shape in a side view, and is bent into the bent portion at a position not hanging on the burring portion. The screw terminal block according to claim 4, wherein the screw terminal block is a structure provided with a through hole.
The screw terminal body is configured as a nut built-in type screw terminal block in which a nut having the female screw is arranged on the lower surface of the top surface portion.
2. The nut according to claim 1, wherein the nut is housed in the resin holder in a state in which rotation is restricted, and a part of the resin holder is fitted to the leg portion. Screw terminal block.
The screw terminal body is configured as a screw terminal block with a built-in nut that includes a nut having the female screw that is press-fitted into the top surface portion and is restricted from rotating and exposed from the top surface portion.
The screw terminal block according to claim 1, wherein the nut is covered from below by the resin holder, and a part of the resin holder is fitted to the leg portion.
The screw terminal block according to any one of claims 1 to 7, wherein a claw portion for preventing rotation of the external terminal connected to the top surface portion is provided on the top surface portion.
JP2011191670A 2011-09-02 2011-09-02 Screw terminal base Pending JP2013054882A (en)
JP2011191670A JP2013054882A (en) 2011-09-02 2011-09-02 Screw terminal base
JP2013054882A true JP2013054882A (en) 2013-03-21
ID=48131708
JP2011191670A Pending JP2013054882A (en) 2011-09-02 2011-09-02 Screw terminal base
JP (1) JP2013054882A (en)
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