JP4128099B2 - Vehicle antenna device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle antenna device suitable for a roof mount antenna that is particularly susceptible to external forces.
[0002]
[Prior art]
In general, a roof mount antenna for a vehicle such as a passenger car is mounted in a state where the antenna mast is not tilted upright with respect to the vehicle roof surface but is greatly inclined toward the vehicle rear side in consideration of air resistance during travel.
[0003]
Since the roof mount antenna has a configuration protruding on the roof of the vehicle, the antenna mast physically interferes with the ceiling or the like when entering a garage of a tower parking type with a limited height, for example, due to an external force applied. It is also possible that it will break.
[0004]
For this reason, there is a structure in which the support portion for supporting the antenna mast is rotated, and the antenna mast and the support portion are appropriately rotated by an external force to prevent breakage. (For example, refer to Patent Document 1.)
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-064313
[Problems to be solved by the invention]
However, for example, when placing the vehicle in a garage with a low ceiling in the back, an external force may be applied to the antenna mast attached in a state inclined to the rear side of the vehicle in a direction corresponding to the axis. Conceivable.
[0007]
In such a case, even if the antenna mast is supported by the support part so as to be rotatable as described above, an external force acts in a direction in which the antenna mast is contracted in the axial direction. Since the external force cannot be released, the antenna mast or the support part is damaged as a result.
[0008]
The present invention has been made in view of the above circumstances, and its purpose is to ensure that even if an external force is applied in a direction that coincides with the axis of the antenna mast, the external force is released by reliably rotating. Another object of the present invention is to provide a vehicle antenna device capable of preventing damage.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, an antenna base that is installed and fixed on a vehicle, an antenna mast supported on the antenna base so as to be rotatable with respect to a lateral direction of the vehicle , and an axial direction of the antenna mast. And a support portion having an eccentric center position.
[0012]
With such a configuration, the support portion of the antenna mast is deliberately decentered with respect to the axial direction of the antenna mast, so even if an external force that compresses the antenna mast in the axial direction is applied. In addition to the fact that the support part can be reliably rotated and the external force can be released to prevent damage , for example, when parking in a garage having a stepped ceiling in the height direction, the antenna mast at the step part Even in the case where the vertical rotation of the antenna is blocked, the support portion of the antenna mast can be reliably rotated to prevent damage.
According to a second aspect of the present invention, in the first aspect of the present invention, the support portion is set so that the rotation surface faces the front side of the vehicle and obliquely upward, and the antenna mast is positioned at the neutral position. It is characterized in that it is erected in a state inclined to the rear side.
With such a configuration, in addition to the operation of the first aspect of the invention, the air resistance during traveling can be reduced.
[0013]
According to a third aspect of the present invention, in the first aspect of the present invention, the support portion incorporates a spring mechanism that automatically returns to a neutral position due to its elasticity when no external force is applied to the antenna mast. And
[0014]
With such a configuration, in addition to the operation of the first aspect of the invention, the support portion of the rotated antenna mast automatically returns to the original neutral position. Even in places where it is difficult to reach the user, the user's effort is not required.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a vehicle roof mount antenna will be described with reference to the drawings.
[0016]
FIG. 1 is a three-sided view showing an external configuration of a vehicle roof mount antenna 10 according to the present embodiment, in which FIG. 1 (A) is a top view, FIG. 1 (B) is a front view, and FIG. (Left) Side view. In the figure, reference numeral 11 denotes an antenna base portion fixedly installed on the vehicle roof. The lower surface thereof is inserted into an antenna mounting hole formed in the vehicle roof iron plate and screwed from the back side of the vehicle roof iron plate, that is, from the vehicle interior side. Thus, a power feeding connector 11a for connecting cords is formed to protrude.
[0017]
A substantially cylindrical support portion 13 formed integrally with the antenna mast 12 is rotatably attached to the antenna base portion 11.
[0018]
The rotation surface of the support portion 13 is set so that the vehicle roof mount antenna 10 is installed on the vehicle so as to face the front side of the vehicle and obliquely upward, and the antenna mast 12 has a normal rotation position. Then, the vehicle is erected in a state of being largely inclined toward the rear side of the vehicle.
[0019]
FIG. 2 illustrates a case where the vehicle roof mount antenna 10 is attached to the vehicle V. In this case, it is understood that the vehicle roof mount antenna 10 is attached to the center of the front end of the roof of the vehicle V, and the antenna mast 12 is erected in a state of being largely inclined toward the rear side of the vehicle V as described above.
[0020]
FIG. 3 mainly illustrates the attachment structure of the support portion 13 to the antenna base portion 11, and the antenna base portion 11 is positioned slightly eccentric from the center of the attachment surface 11 b that coincides with the rotation surface of the support portion 13. A rotation shaft 11c that is screwed inside the central shaft is formed to project.
[0021]
A through-hole having an inner diameter slightly larger than the outer diameter of the rotating shaft 11c formed at a position slightly deviated from the center of the bottom of the bottomed cylindrical support portion 13 with respect to the rotating shaft 11c. By screwing and fastening the bolt 15 after penetrating 13a, the support portion 13 is pivotally attached to the antenna base portion 11.
[0022]
In addition, the bottom part which formed the volt | bolt 15 of the support part 13 is covered by fitting the resin cap 16, for example.
[0023]
In the configuration as described above, the axial direction of the support portion 13 and the antenna mast 12 formed at one end is made to coincide with the center position of the cylindrical support portion 13, whereas the rotation of the support portion 13 is actually performed. The position of the through hole 13a through which the pivot shaft 11c, which is the center, penetrates and fastens the bolt 15 is eccentric as described above.
[0024]
Figure 4 shows a rotation range of the antenna mast 12 and the support portion 13 against the antenna base unit 11.
The antenna mast 12 and the support portion 13 indicated by solid lines in the drawing are in the neutral turning state described in FIGS. 1 to 3, and at this time, the tip of the antenna mast 12 is at the highest position. As shown in the drawing, the rotation center position P1 of the support portion 13 to which the bolt 15 is fastened is deviated by a distance d1 from the original center axis position P2 of the cylindrical support portion 13 that also coincides with the axial direction of the antenna mast 12. You can see that you are mindful.
[0025]
Therefore, when the vehicle roof mount antenna 10 is viewed from the front side as shown in FIG. 4, it is rotated approximately 90 ° to the right indicated by the alternate long and short dash line, and approximately 90 ° rotated to the left indicated by the alternate long and two short dashes line. In the moved state, the position of the support portion 13 changes.
[0026]
In this way, the antenna mast 12 is set along the axial direction by decently setting the axial position of the antenna mast 12 and the central axis position of the support portion 13 and the actual rotation center position of the support portion 13. Even if an external force that presses against the support portion 13 is exerted, the support portion 13 is surely rotated and the external force is released without hindering the rotation of the support portion 13. Breakage can be prevented.
[0027]
Further, the antenna mast 12 and the support portion 13 are configured to have a rotation surface corresponding to the lateral direction of the vehicle as shown in FIG. The vehicle V shown in FIG. 2 is not rotated along a section (parallel to the paper surface of FIG. 2) that bisects the vehicle V in the longitudinal direction.
[0028]
Therefore, for example, the height of the ceiling at the entrance is as high as the height of the end of the antenna mast 12, but the ceiling in the height direction is slightly lower than the height of the ceiling at the back. When the vehicle V is parked in a garage having a back and parked, even if the vertical rotation of the antenna mast 12 is prevented at the stepped portion, the support portion of the antenna mast is securely attached to the vehicle. It is possible to prevent the vehicle roof mount antenna 10 from being damaged by rotating in the lateral direction.
[0029]
In the above-described embodiment, the antenna mast 12 and the support portion 13 are described as merely rotating with respect to the antenna base portion 11, and the state of the antenna mast 12 and the support portion 13 in FIGS. However, for example, at one end of the peripheral wall portion of the support portion 13 shown in FIG. 3 above, the position opposite to the antenna mast 12 across the through hole 13a, and the antenna base portion 11 facing this A spring mechanism such as a coil spring that generates an appropriate tensile tension may be built in so as to be connected to the nearest position.
[0030]
In that case, in a state where no external force is applied to the antenna mast 12, the antenna mast 12 and the support portion 13 are maintained in the neutral position shown in FIGS. When an external force exceeding elasticity is applied to the antenna mast 12, the antenna mast 12 and the support portion 13 rotate as shown in FIG.
[0031]
When the external force is no longer applied, the antenna mast 12 and the support portion 13 are automatically returned to the neutral position again by the elasticity of the spring mechanism.
[0032]
Thus, since the rotated antenna mast 12 and the support portion 13 automatically return to the original neutral position, for example, when the vehicle roof mount antenna 10 is mounted on the roof of a large one-box vehicle. Even if the user's hand is difficult to reach, no special effort of the user is required.
[0033]
In addition, the present invention is illustrated as applied to a roof mount antenna for a vehicle. However, the present invention is not limited to an antenna for a roof mount, but also for an antenna attached to a trunk lid, a fender portion, a rear pillar portion, etc. of a vehicle. The same applies.
[0034]
In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.
[0035]
Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, at least one of the problems described in the column of the problem to be solved by the invention can be solved, and described in the column of the effect of the invention. In a case where at least one of the obtained effects can be obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.
[0037]
【The invention's effect】
According to the first aspect of the invention, since the support portion of the antenna mast is deliberately decentered with respect to the axial direction of the antenna mast, an external force that compresses the antenna mast in the axial direction is applied. In addition to being able to reliably rotate the support portion and escape external force to prevent damage , for example, when parking in a garage having a stepped ceiling in the height direction, the step portion Even when the antenna mast is prevented from rotating in the vertical direction, the support portion of the antenna mast can be reliably rotated to prevent damage.
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the air resistance during traveling can be reduced.
[0038]
According to the invention described in claim 3, in addition to the effect of the invention described in claim 1, the support portion of the rotated antenna mast automatically returns to the original neutral position. Even if the user's hand is difficult to reach, the user's trouble is not required.
[Brief description of the drawings]
FIG. 1 is a three-side view illustrating an external configuration of a vehicle roof mount antenna according to an embodiment of the present invention.
FIG. 2 is a view illustrating an attachment state to the vehicle according to the embodiment;
FIG. 3 is a perspective view exemplifying a structure for attaching a support portion to the antenna base portion 11 mainly according to the embodiment;
FIG. 4 is a view showing a rotation state of a support unit according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Roof mount antenna for vehicles, 11 ... Antenna base part, 11a ... Connector for electric power feeding, 11b ... Support part attachment surface, 11c ... Rotating shaft, 12 ... Antenna mast, 13 ... Support part, 13a ... Through-hole, 14 ... Wave washer, 15 ... bolt, 16 ... cap, V ... vehicle.

Claims (3)

An antenna base to be fixed on the vehicle;
The antenna mast is supported on the antenna base so as to be rotatable with respect to the lateral direction of the vehicle , and the rotation center position is decentered with respect to the axial direction of the antenna mast. A vehicle antenna device. The support portion is set so that a turning surface faces the front side of the vehicle and obliquely upward, and the antenna mast is erected in a state of being inclined toward the rear side of the vehicle at a neutral position. Item 2. The vehicle antenna device according to Item 1.   2. The vehicular antenna apparatus according to claim 1, wherein the support portion incorporates a spring mechanism that automatically returns to a neutral position by its elasticity when no external force is applied to the antenna mast.

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