JP2006294522A - Terminal fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal fixing structure allowing a screw to be extremely surely inserted into a screw insertion opening of a first terminal when a second terminal is fixed to the first terminal. <P>SOLUTION: This terminal fixing structure 1 is provided with: the screw 4 for fixing the second terminal 3; the first terminal 2 electrically connected to the second terminal 3 by specifying the terminal insertion opening 7 for inserting the second terminal 3 thereinto and a first screw insertion opening 9 for inserting the second terminal 3 thereinto and by fixing the second terminal 3 inserted from the terminal insertion opening 7 by the screw 4; and a guide part 5 for entering and extracting the screw 4 into/from the screw insertion opening 9 by specifying a hollow part 11 and by moving the screw 4 in the hollow part 11. The guide part 5 has a tapered structure for catching the screw 4 in a state where the screwing of the screw 4 to the first terminal 2 is released. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a terminal fixing structure in which a second terminal is inserted into a first terminal and a second terminal is fixed by screwing a screw. Specifically, the screw is inserted into the first terminal. The present invention relates to a terminal fixing structure that facilitates the operation.

  6A and 6B are cross-sectional views showing a conventional terminal fixing structure 601. The first terminal 2 is electrically connected to the printed circuit board 6 and is covered with the non-conductive portion 10. When fixing the 2nd terminal 3 to the 1st terminal 2, as shown to FIG. 6A, the 2nd terminal 3 is arrange | positioned in the 1st hollow part 8 via the terminal insertion port 7 of the 1st terminal 2. As shown in FIG. Is done. In this state, as shown in FIG. 6B, the screw 4 is screwed into the screw groove 9 </ b> A, and the screw 4 is inserted into the first hollow portion 8 through the first screw insertion port 9. The second terminal 3 is fixed to the first terminal 2 by sandwiching the second terminal 3 between the screw 4 and the first terminal 2. On the other hand, when removing the second terminal 3 from the first terminal 2, the screw 4 is moved in a direction in which the screw groove 9A is disengaged, and the screw 4 is separated from the second terminal 3 as shown in FIG. 6A. After that, the second terminal 3 is removed from the first terminal 2.

  The terminal fixing structure 601 further includes a guide portion 605 formed in a cylindrical shape by defining the second hollow portion 11. That is, the guide part 5 defines the second hollow part 11 for the screw 4 to withdraw from the first hollow part 8. A tool such as a screwdriver or a hexagon wrench is inserted into the second hollow portion 11 of the guide portion 605 from the tool insertion port 13, and the screw 4 is operated by using the tool to screw the screw 4 into the screw groove 9A. Alternatively, the screw 4 and the screw groove 9A are unscrewed. As shown in FIG. 6A, the screw 4 can move out of the first hollow portion 8 by moving into the second hollow portion 11 through the second screw insertion opening 12. Thereby, the second terminal 3 can be fixed in the first hollow portion 8.

  However, in the conventional terminal fixing structure 601, when the screw 4 and the first terminal 2 are unscrewed, the screw 4 is dropped from the tool insertion port 13 to the outside via the second hollow portion 11. Have the problem of

Furthermore, the conventional terminal fixing structure 601 has a problem that positioning when the screw 4 is inserted into the first screw insertion slot 9 is not easy. That is, the diameter of the second hollow portion 11 of the guide portion 605 is larger than the diameter of the screw 4 so that the screw 4 can be easily moved. Further, in order to dispose the second terminal 3 in the first hollow portion 8, it is necessary to move the screw 4 in the direction in which the screwing is released at least a diameter (thickness) of the second terminal 3 or more. . When the diameter of the second terminal 3 is large, the screw 4 and the screw groove 9A are unscrewed. Here, since the diameter of the second hollow portion 11 is formed larger than the diameter of the screw 4, the screw 4 moves or tilts in the diameter direction. For this reason, when the screw 4 is operated using a tool, the screw 4 moves or tilts in the diametrical direction, so that the center of the screw 4 and the center of the first screw insertion port 9 are positioned on the same straight line. Therefore, it becomes difficult to insert the screw 4 into the first screw insertion port 9. Further, when the screw 4 is tilted, it becomes difficult to insert the tool into the hole defined at the top of the screw 4. As a result, it becomes very difficult to fix the second terminal 3 to the first terminal 2.
JP-A-7-212390

  The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a terminal fixing structure in which a screw does not fall off from a guide portion. Another object of the present invention is to provide a terminal fixing structure in which when a second terminal is fixed to a first terminal, a screw can be inserted into a screw insertion port of the first terminal very easily.

  The terminal fixing structure according to a preferred embodiment of the present invention includes a screw for fixing the second terminal to the first terminal, a terminal insertion slot into which the second terminal is inserted, and a first through which the screw is inserted. A screw insertion port is defined, and the second terminal inserted from the terminal insertion port is fixed by the screw, whereby a first terminal electrically connected to the second terminal and a hollow portion The guide is for the screw to move in and out of the first screw insertion port, and the screw is prevented from moving beyond a predetermined position in the hollow portion. And a regulating means for regulating.

  After the screw is moved from the first terminal into the hollow portion of the guide portion, the second terminal is inserted into the first terminal. By screwing the screw into the first terminal, the second terminal is fixed to the first terminal by the screw. When the screw moves in the hollow portion of the guide portion, the screw is regulated by the regulating means so that the screw does not move from a predetermined position. As a result, the screw does not move beyond a predetermined position within the hollow portion of the guide portion, and thus is prevented from falling out of the guide portion.

  In a preferred embodiment, the restricting means has a structure in which the guide portion holds the screw in a state where the screw and the first terminal are unscrewed.

  In a preferred embodiment, the inner wall of the guide part defining the hollow part has a tapered shape.

  In a state where the screw and the first terminal are disengaged, the screw is held by the guide portion. More specifically, since the inner wall of the guide portion has a taper shape, when the screw moves in the second hollow portion of the guide portion, the screw guides at a predetermined position where the diameter is slightly smaller than the outer diameter of the screw. Nipped by the inner wall of the part. In this state, the center of the screw is collinear with the center of the first screw insertion slot. This is because the guide portion is attached to the first terminal so that the center line of the hollow portion of the guide portion and the center of the first screw insertion port are located on the same straight line. Therefore, the screw can be inserted into the first screw insertion port and screwed in a state where the center of the screw and the center of the first screw insertion port are located on the same straight line. Therefore, it is very easy to insert the screw into the first screw insertion slot and screw it into the first terminal. Furthermore, since the screw is held by the guide portion, it is possible to prevent the screw from dropping out from the hollow portion of the guide portion.

  In a preferred embodiment, the guide portion defines a second screw insertion port through which the screw enters and exits the hollow portion, and the diameter of the hollow portion is at least a predetermined position from the second screw insertion port. It continuously decreases below the outer diameter of the screw.

  In a state where the screw and the first terminal are disengaged, the screw moves into the hollow portion of the guide portion via the second screw insertion port. When the screw moves in the hollow portion, the screw is held by the guide portion at a predetermined position where the diameter of the hollow portion is smaller than the outer diameter diameter of the screw. Therefore, the screw can be inserted into the first screw insertion port in a state where the center of the screw and the center of the first screw insertion port are located on the same straight line. Furthermore, since the diameter of the hollow portion is continuously reduced, the movement of the screw in the hollow portion becomes very smooth. This is because the pressing force to the guide portion of the screw continuously increases as the screw enters the second hollow portion, and thus the reaction force applied to the screw continuously increases.

  In a preferred embodiment, the bottom portion of the screw that is in close contact with the second terminal has a tapered surface. The distance between the position Z where the diameter P of the hollow portion is equal to the sum (Q + R) of the diameter Q of the screw and the diameter R of the tapered surface and the first screw insertion slot is smaller than the length N of the screw. As described above, the inclination angle α at which the diameter of the hollow portion continuously decreases and the diameter of the second screw insertion port are determined.

  The difference between the diameter of the hollow portion and the outer diameter Q of the screw at the position Z is equal to the diameter R of the tapered surface of the bottom of the screw, and the distance between the position Z and the first screw insertion port is the length of the screw. When N is smaller than N, movement in the diameter direction of the screw is allowed (when the screw can be smoothly inserted into the first screw insertion port by the taper surface of the bottom portion of the screw), at least the bottom portion of the screw is in the first position. It will be in the state inserted in the screw insertion slot. Accordingly, the diameter of the second hollow portion increases as the guide portion moves toward the second screw insertion port, but the screw cannot be inserted into the first screw insertion port due to the movement of the screw in the diameter direction. Can be prevented.

  In a preferred embodiment, the restricting means is an abutting portion provided on the guide portion on which the screw abuts, and the screw is in contact with the first terminal in a state where the screw is engaged with the first terminal. Abuts against the part.

  When the screw moves in the hollow portion of the guide portion, the screw abuts against the abutting portion at a predetermined position, so that the screw is restricted from moving beyond the predetermined position. Therefore, it is possible to prevent the screw from dropping out from the guide portion. Further, since the screw contacts the contact portion in a state where the screw is screwed into the screw groove, the screw is not unscrewed from the screw groove. Therefore, when the screw is screwed into the screw groove, it is not necessary for the operator to arrange the center of the screw and the center of the first screw insertion port on the same straight line. Can be combined.

  Since the terminal fixing structure of the present invention includes the restricting means, it is possible to prevent the screws from dropping out of the guide portion. Furthermore, in the terminal fixing structure of the present invention, since the screw is held by the guide portion in a state where the screw and the first terminal are disengaged, the center of the screw and the first screw insertion port is the same. The screw can be inserted into the first screw insertion slot while being positioned on a straight line.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to these embodiments. 1A to 1C are cross-sectional views illustrating a terminal fixing structure 1 according to a preferred embodiment of the present invention. FIG. 1A shows a state where the screw 4 is screwed into the first terminal 2 and the second terminal 3 is not fixed to the first terminal 2, and FIG. 1B shows a state where the screw 4 and the first terminal 2 are not fixed. FIG. 1C shows a state where the screw 4 is screwed to the first terminal 2 and the second terminal 3 is fixed to the first terminal 2. Each state is shown. 2 is a plan view when the terminal fixing structure 1 shown in FIG. 1A is viewed from the A direction, and FIG. 3 is a plan view when the terminal fixing structure 1 shown in FIG. 1A is viewed from the B direction. FIG. 4 is an enlarged cross-sectional view illustrating details of the guide portion 5.

  The terminal fixing structure 1 includes a first terminal 2, a second terminal 3, a screw 4, and a guide part 5. In the terminal fixing structure 1, as shown in FIG. 1C, the second terminal 3 is inserted into the first terminal 2, and the second terminal 3 is fixed by the screw 4. The terminal 2 is electrically connected. Further, the terminal fixing structure 1 includes a restricting means for restricting the screw 4 from moving to the tool insertion opening 13 side from the predetermined position X (see FIG. 4) in the guide portion 5 (second hollow portion 11). Further prepare. The restricting means can prevent the screw 4 from dropping out of the tool insertion port 13. In this example, the restricting means has a structure in which the screw 4 is held by the guide portion 5 in a state where the screw 4 and the first terminal 2 are unscrewed. The first terminal 2 is a terminal (for example, a power supply terminal, a speaker terminal, an audio signal input / output terminal, etc.) provided in an amplifier device or the like, and the second terminal 3 is, for example, a battery device, a speaker, or a playback device (for example, It is one end of a cable 30 connected to a terminal such as a CD player.

  The first terminal 2 is formed of a conductive member such as endian die casting, and is electrically connected to an electric / electronic circuit (for example, a power supply circuit, an amplifier circuit, etc.) disposed on the printed circuit board 6. . The first terminal 2 is defined with a terminal insertion port 7 into which the second terminal 3 is inserted and a first hollow portion 8 in which the second terminal 3 is disposed. The terminal insertion opening 7 and the first hollow portion 8 are defined in a substantially cylindrical shape as shown in FIGS. 1 and 3. The first terminal 2 is further defined with a first screw insertion port 9 through which the screw 4 enters and exits the first hollow portion 8. The first screw insertion port 9 has a shape corresponding to the shape of the screw 4, and typically the screw 4 has a substantially cylindrical shape. Therefore, as shown in FIGS. 1 and 2, the first screw insertion port 9 9 also has a substantially cylindrical shape. A screw groove 9A is formed in the inner wall that defines the first screw insertion slot 9, and the screw 4 enters the first hollow portion 8 when the screw 4 is screwed into the screw groove 9A.

  The first terminal 2 is covered with a non-conductive portion 10 formed of a non-conductive member such as resin in order to prevent leakage to the outside and short circuit with other terminals. In the non-conductive portion 10, an insertion port 10 </ b> A having a slightly larger diameter than the first screw insertion port 9 is defined at a position corresponding to the first screw insertion port 9. Further, in the non-conductive portion 10, an insertion port 10 </ b> B having a slightly larger diameter than the terminal insertion port 7 is defined at a position corresponding to the terminal insertion port 7. Note that the non-conductive portion 10 may be regarded as a part of the first terminal 2, and in this case, a screw groove may be formed in the insertion port 10 </ b> A of the non-conductive portion 10. Further, the non-conductive portion 10 may be integrally formed with the guide portion 5.

  As described above, the second terminal 3 is one end of the cable 30 that connects the amplifier device provided with the first terminal 2 and another device connected to the amplifier device. For example, the second terminal 3 is a conductive plug or The cable 30 itself. Portions other than the second terminal 3 of the cable 30 are covered with a nonconductive member in order to prevent a short circuit with other terminals. The second terminal 3 is inserted into the first hollow portion 8 through the terminal insertion port 7.

  The screw 4 moves into the first hollow portion 8 by screwing into the screw groove 9 </ b> A, and fixes the second terminal 3. That is, the screw 4 is screwed into the screw groove 9 </ b> A in a state where the second terminal 3 is disposed in the first hollow portion 8, and the second terminal is interposed between the bottom portion 4 </ b> A of the screw 4 and the first terminal 2. 3 is inserted and fixed. The screw 4 may be any suitable screw such as a hexagon socket set screw, a bind machine screw, a countersunk screw, a round countersunk screw, a round machine screw, or a pan head screw. A set screw is used. Tapered surfaces are formed on the bottom 4A and the top 4B (see FIG. 1A) of the screw 4 (no thread groove is formed), and the first screw insertion port 9 and the second screw insertion port 12 are connected to each other. It is easy to insert. A screw groove is formed in the screw portion 4C (see FIG. 1) of the screw 4 so as to be screwed into the screw groove 9A of the first terminal 2. The screw 4 is formed in a substantially cylindrical shape, and a hole 31 for inserting a tool such as a screwdriver or a hexagon wrench is defined on the top 4B side as shown in FIG.

  The guide part 5 is for the screw 4 to move in and out of the first hollow part 8 as the screw 4 moves in the second hollow part 11. As shown in FIG. 1B, the guide portion 5 holds the screw 4 in a state where the screw 4 and the screw groove 9 </ b> A are disengaged. Holding the screw 4 means that a part of the screw 4 is in close contact with the inner wall of the guide portion 5 and cannot move in the diameter direction. Thereby, the guide part 5 positions the center of the screw 4. The guide portion 5 is formed in a substantially cylindrical shape by defining the second hollow portion 11. The guide portion 5 further defines a second screw insertion port 12 through which the screw 4 enters and leaves the second hollow portion 11 and a tool insertion port 13 into which a tool is inserted. The guide part 5 is attached to the non-conductive part 10 via the printed circuit board 6. Alternatively, the guide part 5 may be directly attached to the non-conductive part 10.

  The second screw insertion port 12 has a shape corresponding to the shape of the screw 4 and is typically substantially circular. The second screw insertion port 12 has a diameter larger than the outer diameter of the screw 4 so that the screw 4 can be inserted. As shown in FIG. 2, the tool insertion port 13 is typically substantially circular and has a diameter into which a tool can be inserted. In this example, the diameter of the tool insertion port 13 is smaller than the outer diameter of the screw 4. The second hollow portion 11 functions as a space for retracting the screw 4 from the first hollow portion 8 in order to arrange the second terminal 3 in the first hollow portion 8.

  As shown in FIG. 4, the second hollow portion 11 continuously extends from the second screw insertion port 12 to at least a predetermined position X (in this example, to the tool insertion port 13) toward the tool insertion port 13. The diameter P is specified to be small. That is, the inner wall D of the guide part 5 that defines the second hollow part 11 has a tapered shape, and the hollow part 11 is narrowed secondly toward the tool insertion port 13. In this example, the predetermined position X is a position where the diameter P of the second hollow portion 11 is slightly smaller than the outer diameter Q of the screw 4. That is, the diameter P of the second hollow portion 11 continuously decreases to at least the predetermined position X to be equal to or smaller than the outer diameter diameter Q of the screw 4. Thereby, the screw 4 is in a state of pressing the inner wall D of the guide part 5 at the predetermined position X, and the screw 4 is held and fixed by the guide part 5 by the reaction force from the inner wall D. By holding the screw 4 by the guide portion 5, it is possible to prevent the screw 4 from dropping out from the tool insertion port 13 and to position the center of the screw 4 (details will be described later). Specifically, the predetermined position X is a position where the distance M from the predetermined position X to the first screw insertion port 9 is larger than the length N of the screw 4. By setting this position to the predetermined position X, the screw 4 can sufficiently exit from the first hollow portion 8. For example, the distance from the second screw insertion opening 12 to the predetermined position X is about 60 to 80% of the length N of the screw 4.

  Preferably, the diameter P of the second hollow portion 11 linearly decreases to the predetermined position X (that is, the second hollow portion 11 becomes narrower at an equal rate). Thereby, when the screw 4 moves through the second hollow portion 11, the reaction force from the inner wall D of the guide portion 5 does not suddenly increase (or decrease), so that the screw 4 moves through the second hollow portion 11. It can move more smoothly.

  The second hollow portion 11 has a uniform inclination angle α (an angle between the inner wall D of the guide portion 5 and a line E parallel to the outer wall of the guide portion 5) over the entire circumference of the second hollow portion 11. is there. That is, the second hollow portion 11 is uniformly narrowed over the entire circumference as it goes toward the tool insertion port 13. In other words, the center line Y passing through the second hollow portion 11 is orthogonal to the second screw insertion port 12. As a result, when the screw 4 moves in the second hollow portion 11 and is held by the guide portion 5, the screw 4 has its center (specifically, the center L of the bottom portion 4A and the center K of the top portion 4B). ) Is located on the center line Y of the second hollow portion 11. This is because the guide part has a uniform structure over the circumference as described above, and when the screw 4 is clamped by the guide part 5, it receives a uniform reaction force from the inner wall D of the guide part 5 over the whole circumference. This is because the screw 4 is automatically positioned so that the center of the screw 4 is positioned on the center line Y of the second hollow portion 11. Furthermore, since the top part 4B in which the screw groove is not formed contacts the inner wall of the guide part 5 first, the screw 4 does not tilt.

  The guide portion 5 is non-conductive so that the center of the first screw insertion port 9 and the center of the second screw insertion port 12 are located on the same straight line (on the center line Y of the second hollow portion 11). It is attached to the part 10. For example, since the printed circuit board 6 and the guide unit 5 are attached to a housing of an amplifier device (not shown), the center of the first screw insertion port 9 and the center of the second screw insertion port 12 are located on the same straight line. Thus, the mounting holes for the printed circuit board 6 and the guide portion 5 are defined in the housing. Therefore, in the state where the screw 4 is held by the guide portion 5, the center of the screw 4 and the center of the first screw insertion port 9 can be located on the same straight line (Y). When the screw 4 is inserted into the first insertion slot 9, the center of the screw 4 is positioned on the same straight line Y as the center of the first screw insertion slot 9, so that the screw 4 can be inserted into the first screw very easily. Can be inserted into the mouth 9. That is, when the screw 4 is pinched by the guide portion 5, the screw 4 is not moved in the diameter direction (direction perpendicular to the center line Y of the second hollow portion 11), and the screw 4 is inclined. Therefore, the screw 4 can be inserted into the first screw insertion port 9 while keeping the center of the screw 4 and the center of the first screw insertion port 9 on the same straight line. Further, since the movement (or inclination) of the screw 4 in the diameter direction is prevented, it becomes very easy to insert the tool into the hole 31 of the screw 4.

  Next, a preferred method for determining specific dimensions of each part will be described. First, the predetermined position X is set so that the screw 4 can sufficiently withdraw from the first hollow portion 8 based on the length N of the screw 4 and the distance from the first screw insertion port 9 as described above. It has been decided. The inclination angle α and the diameter of the second screw insertion port 12 are the outer diameter diameter Q of the screw 4, the length N, and the diameter R of the tapered surface of the bottom portion 4A (the diameter R is formed by the tapered surface of the outer diameter Q). As well as the distance S between the first screw insertion slot 9 and the second screw insertion slot 12. These values are determined in consideration of the following. When the screw 4 is moved from the guide portion 5 to the first screw insertion port 9, the diameter P of the second hollow portion 11 is different from the outer diameter Q of the screw 4 toward the second screw insertion port 12. Becomes larger. Therefore, the screw 4 moves (or tilts) in the diametrical direction, and the center of the screw 4 and the center of the first screw insertion port 9 are not located on the same straight line, so that the first screw insertion of the screw 4 is performed. There is a possibility that the insertion into the mouth 9 becomes difficult. In order to solve this, before the movement (or inclination) of the screw 4 in the diametrical direction is detrimental to the insertion of the screw 4 into the first screw insertion port 9 (that is, the taper of the bottom portion 4A of the screw 4). The inclination angle α and the second screw insertion port so that at least the bottom portion 4A of the screw 4 is inserted into the first screw insertion port 9 while the surface can be easily inserted into the first screw insertion port 9). Eleven diameters are determined.

  Specifically, the range in which the movement of the screw 4 in the diameter direction is allowed is half R / 2 of the diameter R of the tapered surface of the bottom portion 4A of the screw portion 4. The limit position of the second hollow portion 11 where the screw 4 is allowed to move in the diametrical direction is Z (when the top 4B of the screw 4 is located at the position Z, the screw 4 is allowed to move in the diametrical direction). Then, Z is a position where the difference PQ between the diameter P of the second hollow portion 11 and the outer diameter Q of the screw 4 is equal to the diameter R of the tapered surface (that is, P = Q + R). The position Z is determined as a position where the distance between the position Z and the first screw insertion port 9 is smaller than the length N of the screw 4. For example, the range in which the movement of the screw 4 in the diameter direction is allowed is the diameter R of the tapered surface of the bottom portion 4A of the screw 4 and is 3 mm. Considering this, if the outer diameter Q of the screw 4 is 7 mm, the diameter of the second hollow portion 11 at the position Z is P = Q + R = 10 mm. When the length of the screw 4 is 10 mm and the distance between the first screw insertion port 9 and the second screw insertion port 12 is 5 mm, the inclination angle α is 3 degrees, and the second screw insertion port The diameter is 7.6 mm. As a result, the centers of the screw 4 and the first screw insertion port 9 can be more reliably located on the same straight line, and the screw 4 can be inserted into the first screw insertion port 9 more easily.

  A method for fixing the second terminal 3 to the first terminal 2 in the terminal fixing structure 1 having the above configuration will be described. First, as shown in FIG. 1A, in a state where the screw 4 is screwed to the first terminal 2, a tool is inserted from the tool insertion port 13 and the screw 4 is operated by the tool, whereby the screw 4 is screwed. Move it in the direction that will miss the match. That is, the screw 4 is moved into the second hollow portion 11 through the second screw insertion port 12. Here, it is necessary to move the screw 4 in the direction in which the screw is disengaged by a distance equal to or larger than the diameter of the second terminal 3 so that the second terminal 3 can be disposed in the first hollow portion 8. When the second terminal 3 having a small diameter is arranged and fixed in the first hollow portion 8, the second terminal 3 can be moved even if the screw 4 is moved only to the extent that the screw engagement with the screw groove 9A is not removed. 3 can be arranged in the first hollow part 8. However, when the second terminal 3 having a large diameter is arranged in the first hollow portion 8, if the screw 4 is moved so that the second terminal 3 can be arranged, the screw 4 and the first terminal 2 The screwing is released.

  Therefore, as shown in FIG. 1B, when the screw 4 is further moved toward the tool insertion opening 13 in the second hollow portion 11, the screw 4 comes to press the inner wall of the guide portion 5, and the screw 4 is in a predetermined position. X is held by the reaction force from the guide portion 5. Since the top portion 4B of the screw 4 has a tapered surface and no thread groove, the screw 4 does not tilt when the screw 4 contacts the guide portion 5 at the predetermined position X. The top portion 4 </ b> B of the screw 4 and a part of the screw portion are in close contact with the inner wall of the guide portion 5. As a result, the screw 4 is arranged at a position where the center of the screw 4 is collinear with the center of the first screw insertion slot 9. In this state, the second terminal 3 is disposed in the first hollow portion 8 via the terminal insertion port 7.

  Thereafter, by moving the screw 4 to the first terminal 2 side using a tool, the top 4A is moved to the first portion 4A in a state where the center of the screw 4 is located on the same straight line as the center of the first screw insertion port 9. Can be inserted into the screw insertion port 9. After the top 4A of the screw 4 is inserted into the first screw insertion slot 9, the screw 4 is screwed into the screw groove 9A using a tool, and the screw 4 is brought into contact with the second terminal 3 as shown in FIG. 1C. Move to touching position. The second terminal 3 is fixed to the first terminal 2 by being sandwiched between the screw 4 and the first terminal 2.

  As described above, according to the terminal fixing structure 1, the screw 4 is held by the guide portion 5 in a state where the screw 4 and the first terminal 2 are disengaged. The center of the screw insertion port 9 can be positioned on the same straight line. As a result, after the second terminal 3 is inserted into the first terminal 2, the center can be surely aligned when the screw 4 is screwed to the first terminal 2. It can be inserted into the screw insertion slot 9.

  Next, another preferred embodiment of the present invention will be described with reference to FIGS. 5A and 5B. 5A and 5B are cross-sectional views showing the terminal fixing structure 501 of this embodiment. The same parts as those in FIG. In this example, the restricting means includes an abutting portion (stepped portion) 20 that is provided in the guide portion 505 and abuts when the screw 4 moves in the second hollow portion 11. The abutting part 20 regulates the diameter of the second hollow part 11 to be smaller than the diameter of the screw 4, and restricts the screw 4 from moving to the tool insertion port 13 side by coming into contact with the screw 4.

  The predetermined position in this example is a position where the contact portion 20 is provided. The contact portion 20 (predetermined position) can be provided at any appropriate position of the guide portion 5, but preferably, the screw groove 9 </ b> A of the first terminal 2 in a state where the screw 4 contacts the contact portion 20. It is provided in the position screwed together. Specifically, the distance between the contact portion 20 and the screw groove 9 </ b> A is shorter than the length of the screw 4. As a result, as shown in FIG. 5A, when the screw 4 moves in the second hollow portion 11, the screw 4 comes into contact with the contact portion 20 while being screwed into the screw groove 9A. As a result, the screw 4 is not disengaged from the screw groove 9. Accordingly, when the screw 4 is screwed into the screw groove 9A after the second terminal 3 is disposed in the first hollow portion 8, the screw 4 is not always unscrewed from the screw groove 9A. The screw 4 can be easily screwed into the screw groove 9A.

  That is, the diameter of the guide 4 is larger than the diameter of the screw 4 so that the screw 4 can be easily moved from the second screw insertion opening 12 to the contact portion 20 (predetermined position). . Therefore, if the screw 4 is disengaged from the screw groove 9A in a state where the screw 4 is in contact with the contact portion 20, the screw 4 moves in the diametrical direction or tilts. Therefore, the screw 4 moves (or tilts) in the diametrical direction, and the center of the screw 4 and the center of the first screw insertion port 9 are not located on the same straight line, so that the screw 4 is moved to the first screw insertion port 9. It becomes difficult to insert into. In this example, when the screw 4 contacts the contact portion 20, the screw 4 is screwed into the screw groove 9A. Therefore, the screw 4 can be screwed into the screw groove 9A very easily.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. For example, in the embodiment shown in FIGS. 1 to 4, the guide portion 5 continuously decreases in diameter up to a predetermined position X where the screw 4 is clamped, and the tool insertion port extends from the predetermined position X where the screw 4 is clamped. On the 13th side, the diameter may not change. Further, the diameter may be increased from the predetermined position X toward the tool insertion opening 13 side. That is, it is sufficient that at least the tool can be inserted on the tool insertion port 13 side from the predetermined position X where the screw 4 is held. Further, the second hollow portion 8 may be narrowed rapidly in the vicinity of the second screw insertion port 12, and the amount of narrowing as the position approaches the predetermined position X may be reduced.

  The present invention can be suitably employed for a terminal fixing structure of various electronic devices typified by an audio device (CD / DVD / MD player / recorder or AV receiver).

It is sectional drawing which shows the terminal fixing structure by preferable embodiment of this invention. It is sectional drawing which shows the terminal fixing structure by preferable embodiment of this invention. It is sectional drawing which shows the terminal fixing structure by preferable embodiment of this invention. It is a top view which shows the terminal fixing structure by preferable embodiment of this invention. It is a top view which shows the terminal fixing structure by preferable embodiment of this invention. It is an expanded sectional view showing a guide part. It is sectional drawing which shows the terminal fixing structure by another preferable embodiment of this invention. It is sectional drawing which shows the terminal fixing structure by another preferable embodiment of this invention. It is sectional drawing which shows the conventional terminal fixing structure. It is sectional drawing which shows the conventional terminal fixing structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Terminal fixing structure 2 1st terminal 3 2nd terminal 4 Screw 5 Guide part 7 Terminal insertion port 9 1st screw insertion port 11 2nd hollow part 12 2nd screw insertion port

Claims (6)

A screw that secures the second terminal to the first terminal;
A terminal insertion port into which the second terminal is inserted and a first screw insertion port into which the screw is inserted are defined, and the second terminal inserted from the terminal insertion port is fixed by the screw. A first terminal electrically connected to the second terminal;
A hollow portion is defined, and the screw moves in the hollow portion, so that the screw enters and exits the first screw insertion port, and a guide portion;
A terminal fixing structure comprising: restriction means for restricting the screw from moving beyond a predetermined position in the hollow portion.   The terminal fixing structure according to claim 1, wherein the restricting means has a structure in which the guide portion holds the screw in a state where the screw and the first terminal are disengaged.   The terminal fixing structure according to claim 2, wherein an inner wall of the guide portion defining the hollow portion has a tapered shape.   The guide portion defines a second screw insertion port through which the screw enters and exits the hollow portion, and the diameter of the hollow portion is equal to or smaller than the outer diameter diameter of the screw from the second screw insertion port to at least a predetermined position. The terminal fixing structure according to claim 2, wherein the terminal fixing structure decreases continuously. The bottom of the screw that is in close contact with the second terminal has a tapered surface;
The distance between the position Z where the diameter P of the hollow portion is equal to the sum (Q + R) of the diameter Q of the screw and the diameter R of the tapered surface and the first screw insertion slot is smaller than the length N of the screw. The terminal fixing structure according to claim 4, wherein an inclination angle α at which the diameter of the hollow portion continuously decreases and a diameter of the second screw insertion port are determined.   The restricting means is a contact portion provided in the guide portion, on which the screw contacts, and the screw contacts the corresponding contact portion in a state where the screw is screwed to the first terminal. Item 2. The terminal fixing structure according to Item 1.

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