JP2017091834A - connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal fitting that performs an electric connection with a mating side contact point by projecting and contacting, capable of removing a foreign material in the mating side contact point even a current value becomes large and a board thickness becomes thick.SOLUTION: A connector comprises: a connector housing 80 to which a connector opening part 85 to which a mating side contact point 93 enters is provided; a first conductive member 50 that is arranged so as to approach the connector opening part in the connector housing, and in which the mating side contact point entered from the connector opening part contacts; an elastic member 40 that energizes the first conductive member to the connector opening part side with impact of resilient forces to the first conductive member pressed by the mating side contact point; a metal obliquely winding coil 70 that is arranged so as to contact the mating side contact point of the first conductive member with an outer peripheral part 71 to an opposite side surface, and supports the first conductive member pressed to the mating side contact point; and a second conductive member 60 that is arranged to the connector housing 80 so as to sandwich the obliquely winding coil between the coil and the first conductive member, and is connected to an outer part electric circuit.SELECTED DRAWING: Figure 1

Description

  The technology disclosed in this specification relates to a connector.

  For example, when electrical connection is made in an automobile or the like, a method is known in which electrical connection is made by abutting and contacting the opposing contacts. In such a method, if foreign matter adheres between the contacts, conduction failure occurs, which is not preferable. Therefore, in Japanese Patent Application Laid-Open No. 2002-274290 (the following Patent Document 1), the foreign matter between the contacts is removed by sliding each other at the time of abutment of both the contacts.

  Specifically, in the power feeding device disclosed in Japanese Patent Laid-Open No. 2002-274290 (the following Patent Document 1), an end plate facing the inside of the case and a coil spring sandwiched and compressed between the end plates are provided at the female junction. It has been. The end plate exposed to the outside is provided with a leaf spring member having elasticity. The leaf spring member is provided with an inclined free end portion that is easily elastically deformed by being bent after extending outward from the end plate, and has a male contact point and a female contact point (free end portion). ), The two contacts slide with each other to remove foreign matter between the contacts.

JP 2002-274290 A

  However, the configuration disclosed in Japanese Patent Laid-Open No. 2002-274290 (Patent Document 1) cannot be used for large current applications. This is because, in the case of a large current application, the leaf spring member has an increased plate thickness and increased rigidity, so that the bent portion cannot be deformed, so that the free end portion cannot be elastically deformed freely. Therefore, when the free end comes into contact with the male contact, it cannot be elastically deformed and cannot slide, and foreign matter cannot be excluded.

  The connector disclosed in the present specification includes a connector housing provided with a connector opening into which a mating contact enters, and the connector housing is disposed so as to face the connector opening in the connector housing and enters from the connector opening. A first conductive member that contacts the counterpart contact, and an elastic member that exerts a resilient force on the first conductive member pressed by the counterpart contact and biases the first conductive member toward the connector opening. And an oblique coil made of metal that supports the first conductive member that is disposed so as to contact the outer peripheral portion of the first conductive member on the surface opposite to the counterpart contact and that is pressed against the counterpart contact; And a second conductive member disposed on the connector housing and connected to an external electric circuit so as to sandwich the diagonally wound coil between the first conductive member and the first conductive member.

  In such a configuration, the first conductive member is pressed to the connector opening side of the connector housing by the elastic member and received by the connector housing, and the oblique winding coil is sandwiched between the first conductive member and the second conductive member. It is. In this state, when the mating contact enters through the connector opening of the connector housing, the mating contact abuts against the first conductive member and escapes from the mating contact against the elastic force of the elastic member. Change posture. At this time, since a part of the first conductive member is supported by the outer peripheral portion of the oblique winding coil, there is a movement that rotates (changes the inclined state) around the contact portion. As a result, a shift phenomenon occurs in which the first conductive member is rubbed at the contact portion with the counterpart contact, and even if a foreign object exists between the two, the foreign object is scraped off. Thus, even if the first conductive member itself is not elastically deformed, a shift movement phenomenon occurs with the counterpart contact, so that the thickness of the first conductive member should be increased according to the current value. it can.

As an embodiment of the connector disclosed in this specification, the following configuration may be adopted.
The second conductive member has a cylindrical holding portion that holds a pair of the diagonally wound coils in a parallel state, and one end of the first conductive member is sandwiched between the pair of diagonally wound coils. good.

  In such a configuration, since the oblique winding coil is held by the second conductive member, positioning between the oblique winding coil and the second conductive member is facilitated. In addition, since one end of the first conductive member is sandwiched between the pair of diagonally wound coils, the first conductive member can freely move in a direction perpendicular to the axial direction of the diagonally wound coils. At this time, the displacement amount of one of the oblique winding coils increases and the other decreases, but the spring load of the oblique winding coil does not change much with respect to the displacement amount. For this reason, the influence on the contact resistance resulting from the movement of the first conductive member can be suppressed.

  According to the connector disclosed in this specification, it is possible to remove foreign matters between the mating contacts even when the current value increases and the plate thickness increases.

Sectional drawing which showed the state before fitting the connector and the other party connector in embodiment Sectional drawing which showed the state which contacted the other party contact to the electrical contact member from the state of FIG. Sectional drawing which showed the state which made the connector and the other party connector fit completely from the state of FIG.

<Embodiment>
Embodiments will be described with reference to FIGS. 1 to 3.
The connector 10 of this embodiment is fitted with the mating connector 90. In the following description, the upper side in FIG. 1 is referred to as the upper side, and the lower side in FIG. 1 (the mating connector 90 side) is referred to as the lower side. Moreover, let the left side in FIG. 1 be a front side, and let the right side (electric wire W side) in FIG. 1 be a rear side.

  As shown in FIG. 1, the connector 10 of the present embodiment includes a case 20, a coil spring 40 (an example of an “elastic member”) housed in a compressed state inside the case 20, and a coil spring 40 below the coil spring 40. A first conductive member 50 arranged, a second conductive member 60 connected to an electric wire W drawn to the outside, a pair of diagonally wound coils 70, and a connector housing 80 are provided.

  The case 20 is obtained by pressing a metal plate material such as SUS material. As shown in FIGS. 3 and 4, the case 20 has a pair of left and right walls extending downward from both side edges of the ceiling wall 21 and the ceiling wall 21. The side wall 23 includes a plurality of support portions 25 and 27 that extend inward from the lower edge of the side wall 23 so as to face the ceiling wall 21. A portion between the plurality of support portions 25 and facing the ceiling wall 21 is a case opening 31 into which the mating terminal 91 can enter.

  As shown in FIG. 1, the side wall 23 is provided with a pair of positioning openings 33 that communicate with the case opening 31 and open upward. The positioning opening 33 positions the first conductive member 50 in the front-rear direction by accommodating a protruding portion of the first conductive member 50 described later. The positioning opening 33 is provided at a substantially central position in the front-rear direction of the side wall 23 and is located between the support portions 25 and 27. The upper end edge of the positioning opening 33 is substantially parallel to the ceiling wall 21 and is substantially perpendicular to the central axis L of the coil spring 40. The ceiling wall 21 is provided with a through hole 35. An upper end portion 41 </ b> A of an axial center 41 described later is inserted into the through hole 35 and is caulked to the hole edge portion.

  The plurality of support portions 25, 27 are a pair of left and right one end side support portions 25 arranged on the rear end side of the first conductive member 50 and a pair of left and right other end sides arranged on the front end side of the first conductive member 50. And a support portion 27. The distance between the one end side support part 25 and the ceiling wall 21 is smaller than the distance between the other end side support part 27 and the ceiling wall 21. Moreover, the inner surface of the one end side support part 25 and the inner surface of the other end side support part 27 are arrange | positioned so that the same plane may be made. That is, the inner surface of the one end side support portion 25 and the inner surface of the other end side support portion 27 are arranged so as to form an inclined surface that is non-perpendicular to the central axis L of the coil spring 40.

  As shown in FIGS. 2 and 5, the coil spring 40 is formed by winding a metal wire material such as SUS into a perfect circular coil shape. The coil spring 40 is pivoted by the ceiling wall 21 of the case 20 and the first conductive member 50. It is pinched in a compressed state in the direction. The coil spring 40 is in contact with the ceiling wall 21 and the first conductive member 50 for approximately one turn of the winding. For this reason, the coil spring 40 biases both the ceiling wall 21 and the first conductive member 50. By this urging force, the first conductive member 50 is sandwiched between the lower end of the coil spring 40 and the inner surfaces of the support portions 25 and 27. As described above, since both of the coil springs 40 are sandwiched between the metal members, it is possible to suppress the occurrence of sag or the like due to the urging force of the coil springs 40.

  And the axial center 41 is accommodated in the inside of the coil spring 40, as shown in FIG.1 and FIG.5. The shaft center 41 protrudes in the axial direction of the coil spring 40, and the upper end portion 41 </ b> A of the shaft center 41 is disposed through the through hole 35 of the case 20. The shaft center 41 is made of a metal such as brass and has a cylindrical shape. The upper end portion 41 </ b> A of the shaft center 41 is crimped to the hole edge portion of the through-hole 35 by being struck and caulked from above. The portion where the upper end portion 41 </ b> A of the shaft center 41 is caulked is accommodated in the relief portion 83 of the connector housing 80.

  Further, the lower end of the shaft center 41 is located above the upper end position of the positioning opening 33. Specifically, the lower end of the shaft center 41 is maximized within a range in which the lower end of the shaft center 41 and the first conductive member 50 do not interfere when the first conductive member 50 is lifted upward by the mating terminal 91. It is arranged to be located below. By doing in this way, it can suppress that the coil spring 40 inclines with the force from an up-down direction.

  The first conductive member 50 is obtained by pressing a metal plate material such as a copper alloy, and has a substantially rectangular flat plate shape. The first conductive member 50 is sandwiched between the inner surfaces of the support portions 25 and 27 and the coil spring 40 in an inclined state that is not perpendicular to the central axis L of the coil spring 40. The plate thickness of the first conductive member 50 is set according to the required electric capacity, and has a plate thickness and hardness that can be regarded as a rigid body when compared with the coil spring 40.

  The first conductive member 50 has a pressing portion 51 that supports the lower end of the coil spring 40. Further, although most of the first conductive member 50 is accommodated inside the case 20, the rear end portion 53 and the overhang portion described later are arranged outside the case 20. The pressing portion 51 is positioned between the one end side support portion 25 and the other end side support portion 27, and its lower surface side is exposed to the outside of the case 20 by the case opening 31 of the case 20. The lower surface side of the pressing portion 51 is a contact portion 55 with the counterpart terminal 91.

  A pair of overhang portions are provided on both side edges of the pressing portion 51, and the overhang portions are arranged in the positioning opening 33. The overhanging portion protrudes from the side of the pressing portion 51 in the width direction of the first conductive member 50 and is provided by partially expanding the first conductive member 50. Since the overhanging portion comes into contact with the opening edges before and after the positioning opening 33, the movement of the first conductive member 50 in the front-rear direction is suppressed. On the other hand, since the positioning opening 33 communicates with the case opening 31 and opens upward, the first conductive member 50 is allowed to move upward.

  The second conductive member 60 is obtained by pressing a metal plate material such as a copper alloy, and has a substantially rectangular tube shape. The second conductive member 60 is disposed at a position in contact with the rear end of the case 20, and an opening 61 is provided on the case 20 side (front side). Further, the second conductive member 60 includes a cylindrical holding portion 63 that holds a pair of oblique winding coils 70 and a wire connecting portion 65 to which the electric wire W is connected. The cylindrical holding part 63 holds the pair of diagonally wound coils 70 in a parallel state in the longitudinal direction, and the rear end part 53 of the first conductive member 50 inserted from the opening 61 is used as the pair of diagonally wound coils 70. Hold between. The electric wire connection part 65 is provided in the rear end side of the outer surface of the 2nd conductive member 60, and the core wire part of the electric wire W is connected by resistance welding. The second conductive member 60 is connected to an external electric circuit via the electric wire W.

  Unlike the general coil spring such as the coil spring 40, the diagonally wound coil 70 is a spring wound so that each coil constituting the spring is inclined with respect to the winding direction of the spring. The angle winding coil 70 is periodically changed in pitch angle, and by applying a load to the outer peripheral portion 71, each coil is compressed while falling down in a state inclined with respect to the axis of the coil. The diagonally wound coil 70 has a non-linear region in which the spring load does not change much even if the amount of displacement (the amount of displacement of the spring height (size in the direction perpendicular to the axial direction of the spring)) is increased. ing.

  The pair of diagonally wound coils 70 are compressed in a direction orthogonal to the axial direction to the extent that they can be used in the nonlinear region, and are sandwiched between the second conductive members 60. That is, the oblique winding coil 70 is positioned and held by the second conductive member 60. Further, the diagonally wound coil 70 has an elliptical shape when viewed from the winding direction, and the pair of diagonally wound coils 70 are arranged so that the major axis of the elliptical shape is the front-rear direction. The pair of diagonally wound coils 70 are in contact with each other so as to sandwich the first conductive member 50 at the outer peripheral portion 71.

The connector housing 80 is configured by combining an upper split body 80U and a lower split body 80L made of a synthetic resin divided into upper and lower parts.
The upper split body 80U of the connector housing 80 is provided with a lead-out portion 81 that holds the electric wire W and leads it to the outside of the connector housing 80. Further, on the upper surface of the upper split body 80U of the connector housing 80, a relief portion 83 for allowing the caulked portion of the upper end portion 41A of the shaft center 41 to escape is provided.

  In the lower split body 80L of the connector housing 80, a connector opening 85 that allows entry of the mating terminal 91 (mating connector 90) is provided. The connector opening 85 is provided at substantially the same position as the case opening 31 of the case 20, allows the first conductive member 50 to be exposed downward, and allows the fitting portion 99 described later to enter. Further, a terminal accommodating portion 87 is provided behind the connector opening 85. The terminal accommodating portion 87 can accommodate the second conductive member 60 and is continuous with the lead-out portion 81 in the vertical direction.

  The mating terminal 91 is formed of a conductive metal, and is formed in a substantially L shape by bending a plate-like member extending in the vertical direction forward at a substantially right angle. One end side of the counterpart terminal 91 that faces the first conductive member 50 is a counterpart contact 93. And the spherical part 95 is formed in the upper surface of the other party contact 93 by knocking out from the lower surface side. The central position (the highest point) of the spherical portion 95 is arranged on the extension line of the central axis L of the coil spring 40.

  The mating terminal 91 is held in the mating housing 97 by insert molding. The mating contact 93 is held by the fitting portion 99. When the fitting portion 99 enters the connector opening 85, the connector 10 and the mating connector 90 are fitted. And the flange part 99A is provided in the lower edge position of the fitting part 99 so that it may protrude toward the outer side. The flange portion 99A abuts against the lower surface of the connector housing 80, thereby preventing the mating terminal 91 (the mating contact 93) from entering beyond a predetermined position.

The connector 10 of this embodiment is configured as described above, and its operation will be described subsequently.
In a state before the connector 10 and the mating connector 90 are fitted, the first conductive member 50 is pressed against the case opening 31 side of the case 20 as shown in FIG. Part 25, 27). The first conductive member 50 is held in an inclined state that is not perpendicular to the central axis L of the coil spring 40.

  Further, in a state before the fitting, the rear end portion 53 of the first conductive member 50 is inserted into the opening 61 of the second conductive member 60 and is held in the cylindrical holding portion 63 of the second conductive member 60. Are sandwiched between the diagonal winding coils 70. That is, the respective slant winding coils 70 are sandwiched and held between the first conductive member 50 and the inner surface of the second conductive member 60 and are in a compressed state so that their elastic characteristics are in a non-linear region. The first conductive member 50 and the second conductive member 60 are electrically connected to each other via the oblique winding coil 70 by contacting the oblique winding coil 70 at multiple points. Further, the first conductive member 50 is restricted from moving in the front-rear direction in the case 20 because the overhanging portion contacts the front and rear hole edges of the positioning opening 33.

  When the connector 10 and the mating connector 90 are relatively close to each other, the mating side of the mating terminal 91 passes through the connector opening 85 of the connector housing 80 and the case opening 31 of the case 20 as shown in FIG. The contact 93 enters. At this time, the spherical portion 95 of the mating contact 93 moves relatively along the central axis L of the coil spring 40. In this way, the counterpart contact 93 abuts against the contact portion 55 of the first conductive member 50. Then, when the connector 10 and the counterpart connector 90 are relatively closer, the connector 10 and the counterpart connector 90 are completely fitted as shown in FIG. In this state, the first conductive member 50 is clamped by the biasing force of the coil spring 40 and the pressing force of the counterpart contact 93. Thus, in the fitting state, the first conductive member 50 and the counterpart contact 93 are electrically connected by pressing the first conductive member 50 against the counterpart contact 93 side by the coil spring 40.

  In the state before the fitting, since the front end of the first conductive member 50 is supported in an inclined state, the rotational force is applied to the first conductive member 50 when the counterpart contact 93 abuts against the first conductive member 50. It acts and tries to rotate around the contact portion with the oblique winding coil 70 while being in contact with the counterpart contact 93. Then, as the counterpart contact 93 enters the case 20, the first conductive member 50 translates upward (inside the case 20) by the counterpart contact 93, and the diagonally wound coil 70 of the first conductive member 50. The contact part is rotated around the axis. Then, the first conductive member 50 moves while rotating to a position where the biasing force of the coil spring 40 and the pressing force of the counterpart contact 93 are balanced.

  Further, the rear end portion 53 of the first conductive member 50 is sandwiched between a pair of oblique winding coils 70 and supported by the outer peripheral portion 71 of the oblique winding coil 70. When the first conductive member 50 is rotated, the first conductive member 50 changes its inclination state by sliding the outer peripheral portion 71 of the oblique winding coil 70 around the contact portion with the oblique winding coil 70 as an axis. Rotate as if Since the relative position between the first conductive member 50 and the second conductive member 60 changes due to the rotation and translation of the first conductive member 50, the height dimension of the oblique winding coil 70 changes. Specifically, one diagonal winding coil 70 has a large height dimension (dimension in the end axis direction), and the other diagonal winding coil 70 has a large height dimension.

  Thus, since there is a change in the distance between the first conductive member 50 and the second conductive member 60, the spring load of the sandwiched winding coil 70 may be changed. However, the spring load of the diagonally wound coil 70 does not change so much depending on the amount of displacement (deflection rate) of the dimensions of the coil due to its characteristics. Therefore, even if the height dimension of the oblique winding coil 70 changes, there is almost no change in the spring load on the first conductive member 50 and the second conductive member 60. That is, even if the height dimension of one of the diagonally wound coils 70 is increased, the spring load is not greatly decreased. Therefore, the spring load among the pair of diagonal winding coils 70, the first conductive member 50, and the second conductive member 60 hardly changes as a whole.

  In this way, the first conductive member 50 is moved from the state in which the first conductive member 50 and the counterpart contact 93 first contact each other (the state in FIG. 2) to the fitted state (the state in FIG. 3). It moves upward while rotating about the contact position with the oblique winding coil 70 as an axis. At this time, since the point where the first conductive member 50 and the counterpart contact 93 come into contact with each other is moved by rubbing, even if there is a foreign object between the first conductive member 50 and the counterpart contact 93, The foreign matter is scraped off and removed from the contact portion. And when it moves to a fitting state, the 1st conductive member 50 is hold | maintained in the state perpendicular | vertical with respect to the central axis L of the coil spring 40, and is pressed by the other party contact 93 by the urging | biasing force of the coil spring 40.

  The first conductive member 50 has a contact portion with the oblique winding coil 70 as a rotation axis. By using the diagonally wound coil 70 between the first conductive member 50 and the second conductive member 60, even if the height dimension (displacement amount) of the diagonally wound coil 70 changes, the spring load is almost constant. It does not change. For this reason, the influence on the contact resistance resulting from the movement of the first conductive member 50 can be suppressed.

  Further, since the first conductive member 50 is sandwiched between the pair of diagonally wound coils 70, the first conductive member 50 can freely move in the vertical direction. Assuming that the diagonally wound coil 70 is provided only on the upper side of the first conductive member 50 and the lower side is supported by the second conductive member 60 in the square tube-shaped second conductive member 60, the first conductive member. 50 can move freely up to the allowable displacement amount of the diagonally wound coil spring 70 on the upper side, but cannot move on the lower side because it hits the second conductive member 60. Therefore, as in the present embodiment, if the rear end portion 53 of the first conductive member 50 is sandwiched between the pair of diagonally wound coils 70, the diagonally wound coil 70 is positioned within the second conductive member 60, and the first The conductive member 50 can freely move in the vertical direction.

  As described above, in the connector 10 of this embodiment, the first conductive member 50 is pressed against the connector opening 85 side of the connector housing 80 by the coil spring 40 and received by the connector housing 80, and the first conductive member 50 An oblique winding coil 70 is sandwiched between the second conductive member 60. In this state, when the mating contact 93 enters through the connector opening 85 of the connector housing 80, the mating contact 93 hits the first conductive member 50 and resists the resilient force of the coil spring 40. The posture is changed so as to escape from the side contact 93. At this time, since the rear end portion 53 of the first conductive member 50 is supported by the outer peripheral portion 71 of the oblique winding coil 70, a movement that rotates (changes the inclined state) around the contact portion is generated. As a result, a displacement movement phenomenon occurs such that the first conductive member 50 is rubbed at the contact portion with the counterpart contact 93, and even if there is a foreign object between them, the foreign object is scraped off. Thus, even if the first conductive member 50 itself is not elastically deformed, a shift movement phenomenon occurs with the counterpart contact 93, so that the plate thickness of the first conductive member 50 is increased according to the current value. Can be used.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiments described with reference to the above description and drawings, and includes, for example, the following various aspects.
(1) In the above embodiment, the electric wire W is used. However, connection to an external circuit may be performed by a bus bar or the like.

(2) In the above-described embodiment, the movement of the first conductive member 50 in the front-rear direction is restricted by the projecting portion coming into contact with the hole edge of the positioning opening 33, but the projecting portion and the positioning opening 33 are It does not have to be provided.

  (3) In the above embodiment, the first conductive member 50 is held in an inclined state, but may be held perpendicular to the central axis L of the coil spring 40. In that case, the first conductive member 50 is rotated by shifting the center axis L of the coil spring 40 and the abutting position of the counterpart contact 93, or a plurality of elastic members are used, and the force of the elastic member is increased. You may rotate by making it uneven.

  (4) In the above embodiment, the coil spring 40 is used as the elastic member, but other elastic members such as high-strength rubber may be used. Further, the axis 41 may not be arranged at the center of the coil spring 40.

  (5) In the above embodiment, the pair of diagonally wound coils 70 is used to sandwich the rear end portion 53 of the first conductive member 50, but the diagonally wound coil 70 is opposite to the counterpart contact 93 of the first conductive member 50. Only the ones that are arranged on the surface may be used.

  (6) In the above embodiment, the second conductive member 60 has a rectangular tube shape having the opening 61. However, as long as the second conductive member 60 has a surface facing the first conductive member 50 with the diagonally wound coil 70 therebetween. Other shapes such as a flat plate shape and an L shape may be used. In that case, the oblique winding coil 70 may be positioned only by sandwiching the second conductive member and the first conductive member 50, or may be positioned by a connector housing or the like.

  (7) In the above embodiment, the first conductive member 50 and the coil spring 40 are accommodated in the case 20, but may be directly accommodated in the connector housing. The case 20 may not be made of metal.

DESCRIPTION OF SYMBOLS 10 ... Connector 20 ... Case 31 ... Case opening part 40 ... Coil spring (elastic member)
DESCRIPTION OF SYMBOLS 50 ... 1st electrically-conductive member 51 ... Press part 53 ... Back end part 55 ... Contact part 60 ... 2nd electrically-conductive member 61 ... Opening part 63 ... Cylindrical holding part 65 ... Electric wire connection part 70 ... Diagonal winding coil 71 ... Outer peripheral part 80 ... Connector housing 85 ... Connector opening 90 ... Mating connector 91 ... Mating terminal 93 ... Mating contact

Claims (2)

A connector housing provided with a connector opening into which the mating contact enters,
A first conductive member disposed in the connector housing so as to face the connector opening, and the counterpart contact that has entered from the connector opening abuts;
An elastic member that exerts a resilient force on the first conductive member pressed by the counterpart contact to urge the first conductive member toward the connector opening;
An oblique coil made of metal that supports the first conductive member that is arranged to contact an outer peripheral portion of the first conductive member on the surface opposite to the counterpart contact and pressed against the counterpart contact;
A connector comprising: a second conductive member disposed on the connector housing so as to sandwich the diagonally wound coil between the first conductive member and connected to an external electric circuit.   2. The second conductive member has a cylindrical holding portion that holds a pair of the diagonally wound coils in parallel, and one end of the first conductive member is sandwiched between the pair of diagonally wound coils. Connector described in.

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