JP2007103117A - Guide pin for electric connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guide pin to be fitted to a circuit board separately from a connector, which can be automatically fitted to a regular position. <P>SOLUTION: The guide pin 1 to be fitted to the circuit board separately from a connector on the circuit board is provided with a shaft-like guide part 2A guiding a counterpart connector by making its way into a guided part of the counterpart connector, a flange part 2B coming in contact with a top face of the circuit board by being positioned at a base part of the guide part, and a fixed part fixed to the circuit board penetrating a fitting hole P1 of the circuit board P. The fixed part is provided with a shaft part 2C extended from the guide part and the flange part to be integrated with them and an intermediate member 3 fitted at an outer periphery of the shaft part, and the intermediate member is provided with a large-diameter part 3A with its outer periphery face fitted along an inner periphery of the fitting hole and formed in an outer diameter larger than that inner periphery, so that, at fitting of the guide pin to the fitting hole, the large-diameter part 3A of the intermediate member interferes with the fitting hole P1 to be tapered down. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides a circuit board separately from the connector on the circuit board in order to guide a mating connector to be fitted and connected to a guide pin for an electrical connector, particularly a connector attached to the circuit board. It relates to the guide pin that can be attached to.

  As this type of connector guide pin, one disclosed in Patent Document 1 is known. The connector disclosed in Patent Document 1 is attached to a circuit board as seen in FIG. 16 of Patent Document 1, but the connector itself is not provided with guide pins and is separate from the connector. A guide pin is attached to the circuit board at a position adjacent to the connector.

  As shown separately in FIG. 9 of the accompanying drawings, the guide pin of Patent Document 1 has a flange portion 51A and a screw portion 51B on the attachment base portion 51 of the guide pin 50, and the screw portion 51B is attached to the circuit board P. The flange portion 51A is positioned so as to contact the front surface portion of the circuit board P through the hole P1, and is fixed by screwing the nut 52 into the screw portion 51B protruding through the rear surface side.

The circuit board P is made of a synthetic resin material, and the mounting hole P1 is drilled in the circuit board by a drill or the like. Therefore, the diameter and shape of the mounting hole P1 are limited in accuracy, and so high accuracy cannot be expected. Therefore, even if the center position of the mounting hole is accurate, the diameter is relatively large in order to absorb errors in the diameter and shape, and a large backlash occurs between the screw portion. The guide pin 50 is attached to the circuit board in the following manner. Before the nut 52 is fixed, the threaded portion 51B is loose in the radial direction and the mating connector is engaged with the guide pin to set the appropriate position. At this point, the nut 52 is tightened to fix the position. After the guide pin 50 is fixedly attached by the nut 52, the mating connector is expected to be smoothly pulled out or re-fitted by the guide pin.
JP2004-288453

  However, in the guide pin of Patent Document 1, the center of the mounting hole is formed at a relatively accurate position. However, since there is a gap between the mounting hole and the screw hole, When tightening, the guide pin may move in the radial direction and shift to a position where it strongly contacts the mating connector in the radial direction. In this position, the guide pin can guide the mating connector, but it is accompanied by a strong frictional force, and the guidance is not smooth. In Patent Document 1, a positioning portion 51C having a slightly larger diameter than the screw portion is provided between the screw portion 51B and the flange portion 51A. However, there is a backlash between the positioning portion 51C and the mounting hole P1. With the same trend.

  In addition, since there is a gap, even after the nut is tightened, the mating connector may move further in the radial direction when the mating connector is not fitted. In this situation, the mating connector will be guided again. I can't do that.

  Furthermore, when the nut is tightened, it is necessary to once bring the mating connector to the guide position, so that the guide pin mounting work becomes much troublesome. If an attempt is made to attach the guide pin to the circuit board without using the mating connector, it is not easy to accurately keep the screw portion of the guide pin at the center of the attachment hole until the nut is tightened.

  In the present invention, in view of such circumstances, even when there is a gap between the guide pin and the mounting hole, the guide pin is automatically brought to the center position of the mounting hole when the guide pin is mounted on the circuit board. It is an object of the present invention to provide a guide pin that can be attached at that position.

  The guide pin for an electrical connector according to the present invention is a guide pin that is attached to the circuit board separately from the connector on the circuit board in order to guide the mating connector at the time of fitting. A shaft-shaped guide portion that enters and guides the guided portion of the mating connector, a flange portion that is provided on the base side of the guide portion and that contacts the upper surface of the circuit board, and a mounting hole for the circuit board And a fixing portion that is fixed to the circuit board.

  In such a connector guide pin, in the present invention, the fixing portion has a shaft portion extending from the guide portion and the flange portion and integrally formed therewith, and an intermediate member provided on the outer periphery of the shaft portion, and the intermediate member Has a large-diameter portion whose outer peripheral surface is formed with an outer diameter larger than the inner periphery along the inner periphery of the mounting hole, and when the guide pin is mounted in the mounting hole, the intermediate member has a large diameter. The portion is reduced in diameter by interfering with the mounting hole.

  In the guide pin of the present invention having such a configuration, the large diameter portion of the intermediate member interferes with the inner surface of the mounting hole of the circuit board, so that the guide pin is automatically centered with respect to the mounting hole. In this state, the guide pin is press-fitted into the mounting hole at the large diameter portion. Thus, the guide pin is held on the same axis with respect to the mounting hole. At this time, if the large diameter portion is harder than the circuit board, the large diameter portion bites into the inner peripheral surface of the mounting hole, and if soft, the large diameter portion is compressed by the inner peripheral surface of the mounting hole. Deforms to escape in the direction.

  In the present invention, the fixing portion may include a screwing portion that cooperates with the screwing body on the lower surface side of the circuit board. By doing so, in addition to holding at the large-diameter portion, further secure fixing at the screwing portion is performed. In this case, the threaded portion is an internal thread portion that extends in the axial direction and opens at the end face of the free end of the shaft portion, and the threaded body may be a threaded body that is threadedly engaged with the internal thread portion. The threaded body is an external thread portion formed on the outer peripheral surface on the free end side of the shaft portion, and the threaded body can be a nut that is threaded onto the external thread portion.

  In the present invention, the intermediate member can be made of a material softer than the circuit board as described above.

  According to the present invention, the intermediate member may have a spring portion that can be elastically bent in the radial direction as a large-diameter portion. In this case, the guide pin is extracted from the mounting hole and re-inserted. Mounting is possible.

  In the present invention, the intermediate member can be a ring member, or the intermediate member can be provided integrally with the shaft portion.

  As a specific form, the large diameter portion can be a ridge extending in the axial direction of the guide pin.

  On the other hand, when the inner peripheral surface of the mounting hole of the circuit board is circular or oval, the outer peripheral surface of the intermediate member is preferably formed along the inner peripheral surface of the mounting hole.

  In the present invention, if the flange portion is formed with a chamfered portion for indicating a reference position in the circumferential direction, when the circumferential position with respect to the mounting hole is specified, it is adjusted to the specific position of the mounting hole. Thus, the chamfered portion can be positioned in the circumferential direction.

  As described above, according to the present invention, since the large-diameter portion formed in the intermediate member engages with the mounting hole, as long as the center position of the mounting hole itself is accurate, the guide pin can be used without using the mating connector. Can be attached to the normal position. Therefore, not only the guide pin is accurately positioned at the time of mounting, but also the accurate position is maintained after mounting, and the mounting work is simplified. Even if the mounting hole is non-circular, for example, an ellipse, the guide pin can be mounted accurately and easily if the intermediate member is formed along the shape thereof, regardless of the shape of the mounting hole.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 8 of the accompanying drawings.

  In FIG. 1, the guide pin 1 of this embodiment is separately attached to the circuit board P to which a connector (not shown) is attached, adjacent to the connector. The guide pin 1 is attached to a guided portion of a mating connector (not shown), for example, a mounting hole P1 formed in the circuit board P corresponding to a position entering the guided hole.

  The guide pin 1 has a guide pin main body 2 and an intermediate member 3 attached to the guide pin main body 2, and is screwed into an inner screw portion 4 which is opened at the bottom surface of the guide pin main body 2 and formed as a screwed portion. The screw body 5 is fixed to the circuit board P by the screw body 5.

The guide pin main body 2 is made of a metal material, and extends in a tapered shape from an axial guide portion 2A having a cylindrical outer peripheral surface that enters the guided hole of the mating connector, and a lower portion of the guide portion 2A. The flange portion 2B has a maximum outer diameter larger than the inner diameter of the mounting hole P1, and a shaft portion 2C extending downward from the flange portion 2B and having an outer peripheral surface smaller than the inner diameter of the mounting hole P1. An intermediate member 3 described later is attached to the shaft portion 2C to form a fixed portion. The top portion of the guide portion 2A is tapered to facilitate introduction when the mating connector is guided.

  The shaft portion 2C and the intermediate member 3 forming the fixing portion are shown in FIG. 2 which is an enlarged cross-sectional view in which the circuit board P and the screw body 5 are omitted, and FIG. 3 which is a III-III cross-sectional view in FIG. Shown with. In FIG. 3, the intermediate member 3 is shown in a state before being attached to the shaft portion 2C.

  The flange portion 2B, whose outer diameter gradually increases downward toward a taper shape, has a cylindrical portion 2B1 at the outer periphery of the lower end portion. Furthermore, chamfered portions 2B2 are formed at four locations at equal intervals in the circumferential direction at the lower portion of the flange portion 2B. The chamfered portion 2B2 can be used as a portion for holding the guide pin body 2 by applying an appropriate tool so that the guide pin body 2 does not rotate together when the screw body 5 is tightened, or the guide pin 1 is attached to the mounting hole P1. It can also be used as a mark indicating a reference position when a specific positional relationship is provided in the circumferential direction.

  The shaft portion 2C has a length substantially equal to the thickness of the rotating substrate P in the axial direction, and the outer peripheral surface is chamfered portions 2C1 at four locations in the circumferential direction of the cylindrical surface smaller than the inner diameter of the mounting hole P1 of the circuit substrate P. Is formed.

  The shaft portion 2C is formed with an inner screw portion 4 that is a screwed portion that opens downward, and this inner screw portion 4 is formed extending to the upper position of the tapered flange portion 2B in the axial direction. ing. A screw body 5 as a screwed body is screwed into the inner screw portion 4, and a flat washer 5A and a spring washer 5B are used at that time.

  The intermediate member 3 attached to the shaft portion 2C is made of, for example, a synthetic resin and has a ring shape. The intermediate member 3 is formed as a cylindrical surface that is shorter than the shaft portion 2C in the axial direction and has an inner circumference slightly smaller than the outer diameter of the cylindrical surface portion of the shaft portion 2C, and the outer circumference is smaller than the inner diameter of the mounting hole P1. Further, a projecting large-diameter portion 3A slightly larger than the inner diameter of the mounting hole P1 is provided on the cylindrical surface having a slightly smaller inner diameter so as to extend in the axial direction. The large diameter portions 3A are provided at a plurality of positions in the circumferential direction, preferably at equal intervals in the circumferential direction, and are provided at four locations in the illustrated example. The intermediate member 3 can be made of a soft material softer than the circuit board, or can be made of a hard material harder than the circuit board. In the present embodiment, the intermediate member 3 is press-fitted and attached to the outer peripheral surface of the shaft portion 2C. Since the inner diameter of the intermediate member 3 is slightly smaller than the cylindrical surface portion of the shaft portion 2C and interferes with each other, it is possible to press-fit, and the deformation during press-fitting is formed by the chamfered portion 2C1 adjacent to this cylindrical surface portion. To escape into the gap.

  The guide pin 1 formed by attaching the intermediate member 3 to the guide pin main body 2 in this way is used as follows.

  First, the guide pin 1 with the intermediate member 3 is disposed from above into the mounting hole P1 of the circuit board P drilled at the specified position. By simply applying a slight pressing force to the guide pin 1, the large diameter portion 3A of the intermediate member 3 engages with the mounting hole P1, and the guide pin 1 is naturally centered with respect to the mounting hole P1. In this state, a pressing force is further applied to the guide pin 1, and the guide pin 1 is press-fitted until the lower surface of the flange portion 2B contacts the surface of the circuit board P. At the time of this press fitting, when the large diameter portion 3A is made of a material harder than the circuit board P, the large diameter portion 3A bites into the inner surface of the mounting hole P1, and in the case of a material softer than the circuit board P, The large diameter portion 3A is crushed and expanded in the circumferential direction by that amount. In this way, the guide pin 1 is simply press-fitted into the mounting hole P1, and the mounting to the circuit board is completed, and the guide pin 1 is brought into the specified position and maintained in that position.

  Thereafter, as shown in FIG. 1, together with the flat washer 5A and the spring washer 5B, the screw body 5 is screwed into the inner screw portion 4, and the guide pin 1 is further firmly fixed.

  The present invention can be variously modified in addition to the embodiments shown in FIGS.

  For example, with respect to the guide pin main body, the threaded portion may not be the inner threaded portion, but may be the outer threaded portion 4A as shown in FIG. 4, and the threaded body to be threaded thereto may be the nut 5A.

  As for the intermediate member, when the mounting hole P1 of the circuit board is a long hole as shown in FIG. Different numbers can be formed depending on the position in the direction. In this way, the guide pin for screwing the screw body onto the guide pin is fixed without rotating by making the shape having a minor axis and a major axis (not elliptical or polygonal). Therefore, it is possible to attach the screw body without holding the guide pin so that it does not rotate (hold it by hand, etc.), and it is easy to attach the guide pin to the board on which parts and connectors are densely arranged. Become.

  Furthermore, as shown in FIG. 6, the intermediate member 3 may have a polygonal cross section. In this case, the radius at the corner of the outer peripheral surface is larger than the radius of the mounting hole P1, and the radius at the side portion between the corner and the adjacent corner is smaller than the radius of the mounting hole P1. The corner portion can function as the large-diameter portion described above.

  In addition to or separately from this, the inner peripheral surface of the intermediate member can also be polygonal. This can be realized by making the shaft portion 2C into a polygon. For example, even if the inner peripheral surface of the intermediate member is circular before being attached to the shaft portion, if it is soft, it will be in close contact with the shaft portion when fitted to the shaft portion to form a polygonal inner periphery.

  In each of the above embodiments, since the intermediate member is formed as a ring member, it is selected as appropriate for either fitting or adhesion to the shaft portion, or integral molding with the shaft portion, depending on the material. Can be attached to the shaft.

  Furthermore, instead of the ring member, the intermediate member 3 can be provided with pads as large-diameter portions 3A at a plurality of locations in the circumferential direction as shown in FIG. In this case, the attachment of the large diameter portion to the shaft portion will be adhesion or integral molding. The large-diameter portion 3A has a radially outward surface at a position slightly larger than the radius of the mounting hole P1. In addition, in order to improve the adhesion to the shaft portion of the radially inward surface, the corresponding portion of the shaft portion is made flat or fine unevenness is given thereto, and the large diameter portion is bonded thereto.

  Furthermore, the intermediate member 3 can be a spring member as shown in FIG. This intermediate member has a cylindrical portion 3B to be attached to the shaft portion 2C and a spring portion 3A as a large-diameter portion that extends radially outward while bending in a cantilever shape. The maximum diameter portion of the spring portion 3A is slightly larger than the diameter of the mounting hole P1, and when the guide pin is mounted, the spring portion 3A is pressed against the inner peripheral surface of the mounting hole P1 to reduce the diameter and automatically Thus, the mounting hole P1 is centered and held at that position. The final fixing is performed by screwing a screwed body, for example, a nut 5A, to the external threaded portion 4A of the guide pin 1 in the same manner as described above.

It is a half sectional view of a guide pin at the time of use as one embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view in a state where a screw body at a fixing portion of the guide pin in FIG. 1 is omitted. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is the figure before the attachment to a circuit board which shows the guide pin of other embodiment of this invention. It is a cross-sectional view of an intermediate member as still another embodiment of the present invention. It is a cross-sectional view in the fixing | fixed part to which the intermediate member as other embodiment of this invention was attached. It is a cross-sectional view in the fixing | fixed part to which the intermediate member as other embodiment of this invention was attached. It is a figure which shows other embodiment of this invention. It is a figure which shows the conventional guide pin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Guide pin 3 Intermediate member 2A Guide part 3A Large diameter part 2B Flange part 4 Screw part (inner thread part)
2B2 Chamfer 5 Screwed body (screw body)
2C shaft

Claims (11)

  A guide pin that is attached to the circuit board separately from the connector on the circuit board in order to guide the mating connector at the time of fitting, and the guide pin enters the guided part of the counterpart connector. A shaft-shaped guide portion for guiding, a flange portion provided on the base side of the guide portion and in contact with the upper surface of the circuit board, and an attachment hole of the circuit board are fixed to the circuit board. In the connector guide pin having the fixed portion, the fixed portion has a shaft portion extending from the guide portion and the flange portion and integrally formed therewith, and an intermediate member provided on the outer periphery of the shaft portion, and the intermediate member Has a large-diameter portion whose outer peripheral surface is formed with an outer diameter larger than the inner periphery along the inner periphery of the mounting hole, and when the guide pin is mounted in the mounting hole, the intermediate member has a large diameter. The portion is reduced in diameter by interfering with the mounting hole. For the gas connector guide pin.   The electrical connector guide pin according to claim 1, wherein the fixing portion includes a screwing portion that cooperates with the screwing body on the lower surface side of the circuit board.   3. The electric screw according to claim 2, wherein the screwing portion is an internal screw portion that extends in the axial direction and opens at an end surface of the free end of the shaft portion, and the screwing body is a screw body that is screwed into the internal screw portion. Guide pin for connector.   The electrical connector guide pin according to claim 2, wherein the screwed body is an external screw portion formed on an outer peripheral surface of the free end side of the shaft portion, and the screwed body is a nut screwed into the external screw portion. .   The guide pin for an electrical connector according to claim 1, wherein the intermediate member is made of a material softer than the circuit board.   The guide pin for an electrical connector according to claim 1, wherein the intermediate member has a spring portion that can be elastically bent in the radial direction as a large diameter portion.   The guide pin for an electrical connector according to claim 1 or 5, wherein the intermediate member is a ring member.   The guide pin for an electrical connector according to any one of claims 1, 5, and 7, wherein the intermediate member is provided integrally with the shaft portion.   The guide pin for an electrical connector according to claim 1, wherein the large-diameter portion is a ridge extending in the axial direction of the guide pin.   The guide pin for an electrical connector according to claim 1, wherein the mounting hole has an inner peripheral surface that is circular or oval, and an outer peripheral surface of the intermediate member is formed along the inner peripheral surface of the mounting hole.   The guide pin for an electrical connector according to claim 1, wherein the flange portion has a chamfered portion for indicating a reference position in the circumferential direction.

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