JP3734811B2 - Antenna device - Google Patents

Description

  The present invention relates to a rod-shaped antenna device mounted on a vehicle, and more particularly to a connection structure between an antenna base portion attached to a vehicle and a rod-shaped antenna pole portion.

  In an antenna apparatus in which a rod-shaped antenna pole is fixed to an antenna base attached to a vehicle with a screw, a structure for preventing loosening of the screw has been proposed (for example, see Patent Document 1).

  FIG. 6 is a cross-sectional view showing a configuration of a connection portion of a conventional antenna device. The antenna pole has an antenna element (not shown). A mounting bracket 31 is integrally provided at the base end of the antenna element. A male screw 32 protrudes from the mounting bracket 31. The antenna element and the mounting bracket 31 are covered with an antenna cover 33 formed of a flexible insulating resin. The antenna base 40 is integrally provided with a mounting nut 42 provided with a female screw 41 into which the male screw 32 of the mounting bracket 31 is screwed.

  On the opening end side of the antenna cover 33, a tongue piece 33a is provided in a circumferential shape. On the other hand, on the surface of the antenna base 40 with which the tongue piece 33a abuts, as shown in FIG. 7, a plurality of protrusions 43 having a mountain-shaped cross section are provided radially with respect to the axis.

  In assembling this antenna device, the antenna element is fixed to the antenna base 40 by screwing the male screw 32 of the mounting bracket 31 with the female screw 41 of the mounting nut 42 of the antenna base 40. At this time, the plurality of protrusions 43 of the antenna base 40 bite into the tongue 33a of the antenna cover 33, thereby preventing the male screw 32 from loosening.

JP-A-10-215111

  However, the above antenna device has the following problems.

  When the antenna pole is repeatedly attached to and detached from the antenna base, the tongue piece 33 a is scraped by the protrusion 43. In addition, if the tongue piece 33a remains in the protrusion 43 for a long time while holding the antenna pole, the tongue piece 33a has a bent shape. As a result, the function of preventing the loosening of the screw is deteriorated.

  Some tiltable pole antennas attached to vehicles have a tiltable mechanism (also called a folding mechanism) on the antenna pole side. In such a tiltable pole antenna, it is necessary to fix the antenna pole so that the tiltable direction is in a desired direction. However, in the above fixing method, the position at which the antenna pole is fixed is not determined depending on the accuracy of the screw or the individual force.

  The present invention can provide an antenna device in which the screw loosening prevention function for connecting the antenna base portion and the antenna pole portion to each other is unlikely to deteriorate.

  Moreover, this invention can provide the antenna apparatus which can position an antenna pole part provided with a retractable mechanism.

  The present invention is an antenna device having an antenna base portion mounted on a vehicle and a rod-shaped antenna pole portion attached to the antenna base portion, wherein the antenna pole portion includes a bracket having a through hole, and the bracket A male screw that is inserted into the through hole of the antenna and screwed to a female screw provided on the antenna base, and the male screw is movable with respect to the bracket in the tightening direction of the male screw. A rotation transmission mechanism for transmitting to the male screw; an elastic member provided between the bracket and the male screw; and a first abutting surface facing the antenna base portion; Has a second contact surface opposite to the first contact surface, and when the antenna pole portion is attached to the antenna base portion, the first contact surface When the bracket is rotated after the contact with the second contact surface and the movement of the bracket in the direction of the antenna base is restricted by the contact, the rotation causes the rotation via the rotation transmission mechanism. The male screw rotates, the male screw enters the female screw by the rotation, the elastic member contracts by the entry, and the bracket is biased toward the antenna base by the contraction. It is what.

  In addition, the rotation transmission mechanism has a cross-sectional shape of a contact portion in contact with an inner wall of the through-hole and a cross-sectional shape of the through-hole in the male screw when cut perpendicularly to a tightening direction of the male screw. When the hole rotates, it is preferable to have a shape in which a rotational force is applied from the inner wall of the through hole to the outer wall of the contact portion.

  Furthermore, the antenna pole portion has a first engagement portion provided on the first contact surface, and the antenna base portion is provided on the second contact surface, When the bracket is rotated after the first contact surface and the second contact surface are in contact with each other, the first engagement surface is engaged. It is preferable that the first engagement portion and the second engagement portion are configured to engage with each other in a state where the contact surface is pressed against the second contact surface.

  In the retractable antenna device in which the antenna pole portion has a retractable mechanism, the first engaging portion and the second engaging portion are movable when the antenna pole portion is engaged with each other. It is preferable to be provided at a position where the inclining direction becomes a desired direction.

  According to the present invention, since the loosening of the screw is prevented by the reaction force of the elastic member provided between the male screw and the bracket, the contact surface is scraped when the contact surface bites into the ridge. No deflection occurs. As a result, the screw loosening prevention function is unlikely to deteriorate.

  Furthermore, a first engagement portion is provided on the first contact surface of the antenna pole portion so that the retractable direction of the antenna pole portion becomes a desired direction when engaged with each other, and the second of the antenna base portion is provided. If the second engaging portion is provided on the contact surface, the antenna pole portion including the tilting mechanism can be positioned.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an external view showing an overall configuration of antenna apparatus 100 according to the present embodiment. In the present embodiment, antenna device 100 is a retractable pole antenna that is attached to roof R of the vehicle. The antenna device 100 includes an antenna pole portion 10 and an antenna base portion 20.

  The antenna pole portion 10 includes a rod-shaped antenna element and a tiltable mechanism. The antenna base portion 20 is attached to the roof R of the vehicle and supports the antenna pole portion 10 in a detachable manner. The antenna pole part 10 and the antenna base part 20 are connected to each other by screws.

  FIG. 2 is a schematic diagram showing an internal configuration of a connection portion of antenna apparatus 100 according to the present embodiment. FIG. 3 is a perspective view showing an internal configuration of a connection portion of the antenna pole portion 10. FIG. 4 is a perspective view of the antenna pole portion 10 observed from the antenna base portion 20 side. Hereinafter, the configuration of the antenna pole unit 10 will be described in detail with reference to FIGS.

  The antenna pole portion 10 has a rod-shaped antenna element 11. The antenna element 11 is formed of a helical coil and is covered with an antenna cover 17 formed of a flexible insulating resin. The base end portion of the antenna element 11 is connected to a conductive rotating shaft portion 12 and is supported so as to be rotatable around an axis 12 a perpendicular to the longitudinal direction of the antenna element 11. Hereinafter, the center line (line X in FIG. 2) of the antenna element 11 in a state where the antenna element 11 is erected is referred to as a center line X. Further, the antenna pole portion 10 side is referred to as a pole portion side, and the antenna base portion 20 side is referred to as a base portion side. A conductive bracket 13 is attached to the base portion side of the rotary shaft portion 12 along the center line X.

  As shown in FIG. 3, the bracket 13 is substantially U-shaped, and has a substantially rectangular bottom surface portion 13a substantially perpendicular to the center line X, and a side surface portion 13b extending from two long sides of the bottom surface portion 13a to the pole portion side. 13c. End portions of the side surface portions 13 b and 13 c are connected to the rotating shaft portion 12. An elongated round through hole 13d for screw insertion is formed at the center of the bottom surface portion 13a. A metallic leaf spring 14 for preventing screw loosening is placed on the pole portion side surface of the bottom surface portion 13a.

  The leaf spring 14 has a substantially rectangular flat surface portion 14a in contact with the bottom surface portion 13a, and a total of four spring portions 14b extending from both ends of each of the two short sides of the flat surface portion 14a to the pole portion side. An elongated through hole 14c similar to the through hole 13d of the bracket 13 is formed at the center of the flat surface portion 14a.

  A male screw 15 is inserted into the through hole 13 d of the bracket 13 and the through hole 14 c of the leaf spring 14. The male screw 15 is for connecting the antenna pole portion 10 and the antenna base portion 20. The male screw 15 is inserted so that the screw head 15a is on the pole portion side and the screw portion 15c is on the base portion side. The surface of the screw head 15a on the base portion side comes into contact with the end portions of the four spring portions 14b of the leaf spring 14. A rotation receiving portion 15b is provided between the screw head 15a of the male screw 15 and the screw portion 15c. The cross-sectional shape of the rotation receiving portion 15b is an oblong shape slightly smaller than the through holes 13d and 14c. The length of the rotation receiving portion 15b in the tightening direction is determined so that the rotation receiving portion 15b is always inserted into the through hole 13d from before the male screw 15 is tightened to after the tightening is completed. For this reason, when the through hole 13d rotates, a rotational force is applied from the inner wall of the through hole 13d to the outer wall of the rotation receiving portion 15b. Therefore, when the bracket 13 rotates, the rotational force is transmitted to the male screw 15 through the rotation receiving portion 15b. Further, the rotation receiving portion 15b is movable in the tightening direction of the male screw 15 with respect to the through hole 13d.

  The rotary shaft portion 12, the bracket 13, the leaf spring 14, and the male screw 15 are covered with a pole cover 16 made of a flexible insulating material in such a manner that the movement of the male screw 15 in the tightening direction is not hindered. The pole cover 16 includes a substantially cylindrical cylindrical portion 16 a that covers the outer periphery of the bracket 13 and the like around the center line X, and a circular bottom surface portion 16 b that covers the bottom surface portion 13 a of the bracket 13. Here, the internal shape of the cylindrical portion 16 a is matched to the external shape of the bracket 13 so that the bracket 13 rotates as the pole cover 16 rotates. For this reason, the male screw 15 can be rotated via the bracket 13 by rotating the pole cover 16. Openings are formed in the cylindrical portion 16a and the bottom surface portion 16b of the pole cover 16 so that the pole cover 16 is detachably attached to the bracket 13 and the like. A threaded portion 15c of the male screw 15 protrudes from an opening formed in the bottom surface portion 16b. Further, the bottom surface portion 16b of the pole cover 16 is provided with two concave portions 16c and 16d for positioning the antenna pole portion 10 in the vicinity of the outer periphery thereof.

  In addition to these, the antenna pole unit 10 is also provided with the following. The side surface portions 13b and 13c of the bracket 13 are provided with tongue pieces 13e and 13f cut and raised inside. The tongue pieces 13e and 13f play a role of preventing the male screw 15 from rising to the pole portion side and further preventing the male screw 15 from coming off from the bracket 13. The bracket 13 is provided with locking claws 13g and 13h, and the pole cover 16 is provided with locking protrusions 16e and 16f. The locking claw 13g and the locking projection 16e, and the locking claw 13h and the locking projection 16f abut against each other, thereby preventing the pole cover 16 from coming off the bracket 13.

  FIG. 5 is a perspective view showing a configuration of the antenna base unit 20. Hereinafter, the configuration of the antenna base unit will be described with reference to FIGS. The antenna base portion 20 has a flat plate portion 21 attached to the vehicle. A support portion 22 for supporting the antenna pole portion 10 at a predetermined angle with respect to the flat plate portion 21 is provided on the pole portion side surface of the flat plate portion 21. The support portion 22 has a circular contact surface 22a that is inclined with respect to the flat plate portion 21 by the predetermined angle. The contact surface 22a is a surface that contacts the surface of the bottom surface portion 16b of the pole cover 16 on the base portion side, and has substantially the same radius as the bottom surface portion 16b. The contact surface 22a is provided with two convex portions 22c and 22d for positioning the antenna pole portion 10 in the vicinity of the outer periphery thereof. The support portion 22 is provided with a female screw 22b that is screw-coupled with the male screw 15 at the center of the contact surface 22a. Specifically, a nut provided with a female screw 22b is integrally provided on the support portion 22 by insert molding or the like.

  The arrangement of the concave portions 16c and 16d and the convex portions 22c and 22d will be described. The concave portions 16c and 16d and the convex portions 22c and 22d are for positioning the antenna pole portion 10 so that the tiltable direction of the antenna element 11 is a desired direction. In the present embodiment, the antenna element 11 is arranged so as to fall in the inclination direction of the contact surface 22a when the convex portion 22c enters the concave portion 16c and the convex portion 22d enters the concave portion 16d. Here, the concave portions 16c and 16d are arranged at both ends of the diameter of the bottom surface portion 16b parallel to the shaft 12a of the rotating shaft portion 12, and the convex portions 22c and 22d are contact surfaces perpendicular to the inclination direction of the contact surface 22a. It arrange | positions at the both ends of the diameter of 22a. The recesses of the concave portions 16c and 16d are formed along the radial direction of the bottom surface portion 16b, and the protrusions of the convex portions 22c and 22d are formed along the radial direction of the contact surface 22a.

  Hereinafter, attachment of the antenna pole part 10 to the antenna base part 20 will be described. First, the operator inserts the screw portion 15 c of the male screw 15 into the female screw 22 b of the antenna base portion 20. Then, the pole cover 16 is rotated in the direction in which the male screw 15 is tightened. This rotation is transmitted to the male screw 15 via the bracket 13, and the male screw 15 enters the female screw 22b.

  When the male screw 15 enters the female screw 22b by a certain amount, the bottom surface portion 16b of the pole cover 16 and the contact surface 22a of the support portion 22 contact each other. After the contact, the portion of the antenna pole portion 10 excluding the male screw 15 cannot move to the base portion side. On the other hand, when the pole cover 16 is further rotated, the male screw 15 enters the female screw 22b. At this time, the distance between the screw head 15a of the male screw 15 and the bottom surface portion 13a of the bracket 13 is shortened, and the spring portion 14b of the leaf spring 14 contracts. By the reaction force of the spring portion 14b due to the contraction, the bottom surface portion 16b is pressed against the contact surface 22a.

  Then, when the pole cover 16 is rotated, the concave portions 16c and 16d are rotated, and when the concave portions 16c and 16d come to the positions of the convex portions 22c and 22d, the convex portion 22c enters the concave portion 16c, and the convex portion 22d becomes the concave portion 16d. Get in. Thereby, the antenna pole part 10 is fixed to the antenna base part 20 so that the tilting direction of the antenna element 11 is the inclination direction of the contact surface 22a. Further, since the bottom surface portion 16b is pressed against the contact surface 22a, a click feeling is generated when the convex portions 22c and 22d enter the concave portions 16c and 16d.

  According to the present embodiment, the following effects can be obtained. Since the leaf spring 14 is provided between the lower surface of the screw head 15a of the male screw 15 and the pole portion side surface of the bottom surface portion 13a of the bracket 13, the antenna pole portion 10 is fixed with the leaf spring 14 contracted. The looseness of the screw 15 can be prevented. Further, since the bracket 13 and the pole cover 16 are biased toward the base portion due to the contraction of the leaf spring 14, the antenna pole portion 10 can be firmly fixed to the antenna base portion 20.

  Further, since the loosening of the male screw 15 is prevented by the reaction force of the leaf spring 14, the conventional case of preventing the loosening by causing the contact surface of the antenna cover made of a flexible resin to bite into the protrusions of the antenna base. In comparison, there is little decrease in the loosening prevention function due to repeated attachment and detachment. That is, even when the antenna pole portion 10 is repeatedly attached and detached, the looseness of the male screw 15 can be effectively prevented.

  Furthermore, since the male screw 15 can be rotated by rotating the pole cover 16, the male screw 15 can be easily tightened or loosened, and the workability of attaching and detaching the antenna pole portion 10 is improved.

  In addition, since the cross-sectional shapes of the rotation receiving portion 15b of the male screw 15 and the through hole 13d of the bracket 13 are oblong, when the through hole 13d rotates, it rotates from the inner wall of the through hole 13d to the outer wall of the rotation receiving portion 15b. Power is added. Thereby, the rotation transmission mechanism for transmitting the rotation of the bracket 13 to the male screw 15 can be realized with a simple configuration.

  In addition, the pole cover 16 is provided with recesses 16c and 16d, the antenna base part 20 is provided with projections 22c and 22d, and the antenna pole 10 is fixed in a state where the projections 22c and 22d enter the recesses 16c and 16d. The rotation of the antenna pole portion 10 after fixing can be prevented, and the male screw 15 can be further prevented from loosening.

  Further, when the convex portions 22c and 22d enter the concave portions 16c and 16d, the reaction force of the leaf spring 14 is effective, so that a click feeling is generated, and it can be easily felt that the pole cover 16 has entered. Can be stopped.

  Further, since the reaction force of the leaf spring 14 is effective to hold the antenna pole portion 10, the shape of the convex portions 22c, 22d and the like is not deformed, and the same click feeling can be obtained even after repeated removal. Can do.

  Further, when the convex portion 22c enters the concave portion 16c and the convex portion 22d enters the concave portion 16d, the concave portions 16c and 16d and the convex portions 22c and 22d are arranged so that the tiltable direction of the antenna element 11 becomes a desired direction. Since it is arranged, the antenna pole portion 10 can be easily positioned in the retractable antenna device in which the tiltable direction is determined.

  Further, since there is a deflection allowance of the leaf spring 14, even if the male screw 15 is screwed in to some extent and then further screwed in, the parts are not damaged.

  As mentioned above, although embodiment of this invention was shown, it cannot be overemphasized that this invention is not limited to said embodiment. The rotation transmission mechanism may have any configuration as long as the rotation of the bracket 13 can be transmitted to the male screw 15 so that the male screw 15 can move in the tightening direction of the male screw 15 with respect to the bracket 13. For example, the cross-sectional shapes of the rotation receiving portion 15b and the through hole 13d of the male screw 15 are not limited to the long round shape, and may be other shapes such as a triangle as long as the rotation is transmitted.

  In addition, the type and arrangement of the elastic member provided between the male screw 15 and the bracket 13 are as the male screw 15 enters the female screw 22b after the bottom surface portion 16b and the contact surface 22a contact each other. As long as it contracts and the bracket 13 can be urged in the direction of the antenna base portion, it may be different from the above embodiment. For example, instead of the leaf spring 14, a male screw 15 can be inserted into the coil spring.

  Further, the first contact surface facing the antenna base portion is not limited to the bottom surface portion 16 b of the pole cover 16, and may be a surface on the base portion side of the bottom surface portion 13 a of the bracket 13.

  In the above-described embodiment, the first engagement portion and the second engagement portion are the recesses 16c and 16d and the projections 22c and 22d, but the first engagement portion and the second engagement The type, number, position, etc. of the parts can be changed as appropriate.

1 is an external view showing an overall configuration of an antenna device 100. FIG. 2 is a schematic diagram illustrating an internal configuration of a connection portion of the antenna device 100. FIG. 3 is a perspective view showing an internal configuration of a connection portion of the antenna pole portion 10. FIG. It is the perspective view which observed the antenna pole part 10 from the antenna base part 20 side. FIG. 4 is a perspective view showing a configuration of an antenna base unit 20. It is sectional drawing which shows the structure of the connection part of the conventional antenna device. It is a top view which shows the protrusion provided in the antenna base of the conventional antenna apparatus.

Explanation of symbols

  100 antenna device, 10 antenna pole portion, 11 antenna element, 12 rotating shaft portion, 12a shaft, 13 bracket, 13a bottom surface portion, 13b, 13c side surface portion, 13d through hole, 13e, 13f tongue piece, 13g, 13h locking claw , 14 Leaf spring, 14a Flat portion, 14b Spring portion, 14c Through hole, 15 Male screw, 15a Screw head, 15b Rotation receiving portion, 15c Screw portion, 16 Pole cover, 16a Cylindrical portion, 16b Bottom portion, 16c, 16d Recess , 16e, 16f Locking projection, 17 Antenna cover, 20 Antenna base part, 21 Flat plate part, 22 Support part, 22a Contact surface, 22b Female thread, 22c, 22d Convex part.

Claims (4)

An antenna device having an antenna base portion mounted on a vehicle and a rod-shaped antenna pole portion attached to the antenna base portion,
The antenna pole part is
A bracket having a through hole;
A male screw inserted into a through hole of the bracket and screwed to a female screw provided in the antenna base portion;
A rotation transmission mechanism for transmitting the rotation of the bracket to the male screw so that the male screw can move in the tightening direction of the male screw with respect to the bracket;
An elastic member provided between the bracket and the male screw;
A first contact surface facing the antenna base portion;
Have
The antenna base portion has a second contact surface facing the first contact surface,
When the antenna pole portion is attached to the antenna base portion, the first contact surface and the second contact surface are in contact with each other, and movement of the bracket toward the antenna base portion is restricted by the contact. Then, when the bracket is rotated, the male screw rotates through the rotation transmission mechanism by the rotation, the male screw enters the female screw by the rotation, and the elastic member contracts by the entry. Then, the antenna device is characterized in that the bracket is biased toward the antenna base portion by the contraction. The antenna device according to claim 1,
The rotation transmission mechanism is
The cross-sectional shape of the contact portion that contacts the inner wall of the through-hole and the cross-sectional shape of the through-hole of the male screw when cut perpendicularly to the tightening direction of the male screw, and the through-hole when the through-hole rotates An antenna device comprising a shape in which a rotational force is applied from the inner wall of the contact portion to the outer wall of the contact portion. The antenna device according to claim 1 or 2,
The antenna pole portion has a first engagement portion provided on the first contact surface,
The antenna base portion is provided on the second contact surface, and has a second engagement portion that engages with the first engagement portion,
When the bracket is rotated after the first contact surface and the second contact surface contact each other, the first contact surface is pressed against the second contact surface. The antenna device, wherein the first engaging portion and the second engaging portion are engaged. The antenna device according to claim 3, wherein
The antenna pole part has a folding mechanism,
The antenna device according to claim 1, wherein the first engaging portion and the second engaging portion are provided at a position where a tiltable direction of the antenna pole portion becomes a desired direction when the first engaging portion and the second engaging portion are engaged with each other.

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