JPH03734Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Field of Industrial Application] The present invention relates to an on-vehicle antenna device that is attached to a part of the vehicle body such as a front pillar or roof of a vehicle.

[Conventional technology]

Conventionally, a synthetic resin molded part such as an insulator that has a feeding tube integrally provided on the inner periphery and a feeding section provided on a part of the outer periphery, and an antenna element,
and a tightening screw that is tightened on the side of the synthetic resin molded part, and by removing this tightening screw,
There is a vehicle-mounted antenna device in which the antenna element can be attached and detached even when the synthetic resin molded part is attached to a part of the vehicle body, and when the antenna element is broken, it can be easily replaced from outside the vehicle body. . FIG. 6 is a longitudinal cross-sectional view of a feed connection part showing an example of the conventional vehicle-mounted antenna device as described above. In this antenna device, a feed spring 2 is fixed to the outer peripheral surface of the end portion of the antenna element 1 The power supply spring 2 is slidably supported by an inner tube 3, and the inner tube 3 is provided on the inner circumferential surface of a power supply tube 4 provided on the inner circumferential surface of a synthetic resin molded part (not shown in FIG. 6). The antenna element 1 is slidably supported on the feeding spring 5, and the antenna element 1 is attached to the feeding tube 4 together with the inner tube 3.
It is designed to be attached and detached from the tip side. In addition, the power supply springs 2, 5 are provided with cuts 2b, 5b at multiple locations in the circumferential direction on the end side of the cylindrical parts 2a, 5a, and the spring parts 2c, 5c between these cuts 2b, 5b are formed on the outer circumferential side. The cylindrical portions 2a, 5a are curved.
are fixed to the antenna element 1 and the feeding tube 4, and the spring portions 2c and 5c are pressed against the inner and outer peripheral surfaces of the inner tube 3.

[Problem that the invention attempts to solve]

However, the conventional antenna element, which allows the antenna element to be attached and detached from the outside of the vehicle body while attached to the vehicle body, has two power supply springs at the power supply connection part, an inner and an outer power supply spring, as is clear from FIG. However, there were problems in that the number of parts was large, the structure was complicated, assembly was troublesome, and the power supply spring was easily aged. The present invention solves the above-mentioned problems, simplifies the structure of the power supply connection part, facilitates assembly, makes the power supply spring less likely to deteriorate, and can withstand long-term use. It is an object of the present invention to provide an on-vehicle antenna device in which the element can be attached and detached from the outside of the vehicle body.

[Means to solve the problem]

This invention consists of a synthetic resin molded part with a power feeding tube on the inner periphery, a base nut on the tip, and a power feeding part on a part of the outer periphery, a flange protruding from the outer periphery of the tip, and a base nut on the inner periphery of the middle part. The power supply spring part is bulged out, a small diameter part is formed at the distal end, and a cut is formed along the axial direction from the tip side to the distal end of the power supply spring part, and the power supply tube of the synthetic resin molded part is a spring tube that is fitted and supported so as to be slidable in the axial direction; a stopper that abuts the small diameter portion of the spring tube from the distal end; the outer peripheral surface of the spring tube is elastically supported by the power supply spring portion; Further, an antenna element is inserted into the spring tube so as to be slidable in the axial direction, and the flange of the spring tube is sandwiched between a base nut provided on the synthetic resin molded part, and the antenna element is tightened to the base nut. The antenna element and the spring tube are configured to be detachable from the synthetic resin molded part by removing the tightening screw.

[Effect]

The vehicle-mounted antenna device according to the present invention has a flange protruding from the outer periphery of the tip, a feeding spring portion bulging from the inner periphery of the intermediate portion, a small diameter portion at the distal end, and further extending from the tip of the feeding spring portion to the distal end. The antenna element is fitted into the spring tube, and the outer circumferential surface of the antenna element is slidably supported by the feeding spring portion, and the spring tube was slidably supported on the power supply tube of the synthetic resin molded part, and the flange was clamped between a base nut integrally provided at the tip of the synthetic resin molded part and a tightening screw tightened to this base nut. Electrical connection between the antenna element and the feeding tube can be made with a single spring tube without using a separate feeding spring, and together with the fact that the base nut is integrated with the synthetic resin molded part, the number of parts is small and the structure is simple. It is simple and easy to assemble,
In addition, the feeding spring section is provided in the middle of the spring tube, and the feeding spring section is also provided with a cutout, so that the feeding spring section does not easily deteriorate even when the antenna element expands and contracts many times. .

【Example】

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 5. In FIGS. 1 and 2, reference numeral 1 denotes an antenna element, and the antenna element 1 is a long antenna element consisting of a single thin pole or a two-stage telescoping pole whose inner part is a solid rod. A stopper 1a having a larger diameter than the pole is provided at the end. As shown in FIG. 3, the spring tube 6 into which the antenna element 1 is inserted has a flange 6a protruding from the outer periphery of the tip, and a feeding spring portion 6b which bulges inward toward the end of the intermediate portion. is formed, and a small diameter portion 6c is formed at the distal end, and a pair of cuts 6d, 6d along the axial direction from the distal end side to the distal end of the power feeding spring section 6b are arranged on the same diameter of the spring tube 6 and opposite to each other. It is formed facing the direction. The antenna element 1 is inserted into the spring tube 6 from the distal end side, and when fully extended, the stopper 1a abuts the end of the small diameter portion 6c, and the outer peripheral surface of the antenna element 1 is slidably elasticized by the feeding spring portion 6b. held and frictionally supported. A synthetic resin molded part 7 such as an insulator into which the spring tube 6 is removably inserted from the tip side is integrally provided with a power supply tube 8 on the inner circumference, a base nut 9 on the tip, and a power supply part on a part of the outer circumference. 10 are provided. The base nut 9 has a female thread 9b formed on the inner periphery of the portion where the inner diameter on the tip side becomes larger than the step 9a, and a ring fitting groove 9c formed on the outer periphery. In the power feeding section 10, the tip of a feeder wire 11 made of a coaxial cable is buried in the synthetic resin molded part 7, and the core wire 11a, which is the center conductor of the feeder wire 11, is soldered to the outer peripheral surface of the power feeding tube 8. Thus, the tubular braided wire 11b, which is the outer conductor of the feeder wire 11, is connected and fixed to the outer periphery of the synthetic resin molded part 7.
The connection is fixed by soldering, etc. The spring tube 6 and the antenna element 1 are slidably inserted into the feed tube 8 from the distal end side of the synthetic resin molded part 7 in the axial direction, and the flange 6a of the spring tube 6 is inserted into the step 9a of the base nut 9 from the distal end side. The spring tube 6 is supported by the portion having the cut 6d, which is slightly reduced in diameter, and is pressed against the inner circumferential surface of the feeding tube 8 by the elastic restoring force of this portion, and the antenna element 1 is supported by the spring tube 6. It is electrically connected to the power supply tube 8 via the power supply tube 8 . A male threaded portion 13a of a tightening screw 13 made of a synthetic resin molded product is tightened on the tip side of the female thread 9b of the base nut 9 provided on the synthetic resin molded part 7, and the male threaded portion 1
The flange 6a is sandwiched between the end face of the base nut 3a and the step 9a of the base nut 9, and the spring tube 6 is fixed to the synthetic resin molded part 7 side.
is inserted into the tightening screw 13 so as to be movable in the axial direction.
At the end of the synthetic resin molded part 7, there is a flexible synthetic resin tube 1 for housing the antenna element 1.
4 are connected by a connecting tube 15. As shown in FIGS. 4 and 5, the vehicle-mounted antenna of the embodiment configured as described above is fixed to a part of the vehicle body 16 such as the front pillar or roof of the vehicle to form an antenna device. Ru. That is, as shown in FIGS. 4 and 5, the synthetic resin molded component 7 is loosely inserted into the mounting hole 16a provided in the vehicle body 16, and the synthetic resin molded component 7 is attached to the mounting base 17 and the mounting hole 16a on the outer surface of the vehicle body 16. A ring groove 18 is inserted into a mount member 18 made of synthetic resin that is fitted and supported by the mounting base 17, and is provided in the mount member 18.
The O-ring 19 is fitted into the ring-fitting groove 9c provided in the base nut 9 and the O-ring 19 to ensure waterproofness between the synthetic resin molded part 7 and the mount member 18.
is secured. Also, the mounting screws 2 are inserted into the pair of screw holes 18b, 18b of the mount member 18 from the outside.
0 penetrates the mounting base 17 and is screwed into the vehicle body 16, and the mount member 18 and the mounting base 17 are tightened and fixed to the vehicle body 16. The cylindrical protrusion 21a of the ground plate 21 attached to the inner circumference of the mount member 18 is connected to one screw hole 18b of the mount member 18.
The ground plate 21 is fitted into the inner circumference of the mount member 18.
The in-vehicle antenna is fixed to the vehicle body 16 by being sandwiched between the mounting base 17 and the mounting base 17 . Furthermore, the ground plate 21 extends toward the distal end along the outer periphery of the synthetic resin molded part 7, and the distal end of the ground plate 21 is soldered to the ground mounting tube 12, so that the braided wire 11b of the feeder wire 11 is the earth mounting tube 1
2. Connect the vehicle body 1 via the ground plate 21 and mounting screws 20.
It is grounded to 6. In the vehicle-mounted antenna device of the embodiment configured as described above, when the antenna element 1 is pulled out, the stopper 1a from the tightening screw 13 protruding on the mount member 18 comes into contact with the end of the small diameter portion 6c of the spring tube 6. Extends to. In addition, by pushing the antenna element 1 in the extended state, the decorative ball (not shown) provided at the tip of the antenna element 1 is reduced until it comes into contact with or comes close to the tip of the tightening screw 13, and the antenna element 1 is made of synthetic resin. Part 7 and flexible synthetic resin tube 1
It is stored in 4. To replace the antenna element 1 when it is broken, etc., remove the tightening screw 13 from the base nut 9, pull out the antenna element 1, and attach the synthetic resin molded part 7, mount member 18, mounting base 17, etc. to the vehicle body. The antenna element 1 can be removed from the synthetic resin molded part 7 together with the spring tube 6 while remaining fixed on the 16 side. Replace the antenna element 1 and spring tube 6 with new ones, push them into the synthetic resin molded part 7 from the outside of the vehicle body 16, and tighten the tightening screw 13.
The antenna element 1 and the spring tube 6 can be attached to the synthetic resin molded part 7 by tightening them to the base nut 9 and sandwiching the flange 6a of the spring tube 6 between them. Therefore, according to this embodiment, the antenna element 1 and the spring tube 6 can be easily attached and detached by operating from the outside of the vehicle body 16. Further, the spring tube 6 itself is elastically supported on the inner circumferential surface of the power feeding tube 8 by using the cutout 6d provided therein, and the antenna element 1 is attached to the feeding spring portion 6b provided in the axially intermediate portion of the spring tube 6. Since the outer circumferential surface of the base nut 9 is elastically supported, the antenna element 1 and the feed tube 8 can be electrically connected with the spring tube 6 without using a separate feed spring.
Combined with the fact that it is integrated with the synthetic resin molded part 7, the number of parts is small, the structure is simple, and assembly is easy, and the power supply spring part 6b is provided in the middle part of the spring tube 6. In addition, since the feed spring portion 6b is also provided with the cutout 6c, the feed spring portion 6b is unlikely to deteriorate even when the antenna element 1 is expanded and contracted many times. In the present invention, the mechanism for fixing the synthetic resin molded part to the vehicle body is not necessarily limited to that of the embodiments described above, and may be modified as appropriate.

[Effect of the idea]

As explained above, according to the present invention, the flange protrudes from the outer periphery of the tip, the power supply spring bulges from the inner circumference of the middle part, the small diameter part is formed at the distal end, and the tip of the power supply spring has a small diameter. It has a spring tube in which a cut is formed along the axial direction from the side to the end, an antenna element is fitted into the spring tube, and the outer circumferential surface of the antenna element is slidably supported by the feeding spring part, The spring tube is clamped between a base nut integrally provided at the tip of the synthetic resin molded part and a tightening screw tightened to this base nut, so that when the synthetic resin molded part etc. are attached to the car body, An in-vehicle antenna device in which the antenna element can be easily attached and detached from the outside along with the spring tube has the advantage of having a simple structure with a small number of parts, easy assembly, and improved durability as the power supply spring part is less prone to aging. is obtained.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the main parts of an in-vehicle antenna device according to an embodiment of the present invention, Fig. 2 is an exploded explanatory view of the same, Fig. 3 is a perspective view of the spring tube, and Fig. 4 shows the state in use. FIG. 5 is a front view of the main parts, FIG. 5 is a partially cross-sectional view taken along the V arrow in FIG. 4, and FIG. 6 is a schematic exploded longitudinal sectional view showing a power supply connection portion of a conventional vehicle-mounted antenna device. 1...Antenna element, 1a...Stopper, 2,
5... Power supply spring, 2a, 5a... Cylindrical part, 2b,
5b...Cut, 2c, 5c...Spring part, 3...
Inner tube, 4... Power feeding tube, 6... Spring tube, 6a... Flange part, 6b... Power feeding spring part,
6c...Small diameter part, 6d...Cut, 7...Synthetic resin molded part, 8...Power supply tube, 9...Base nut, 9a...Step, 9b...Female thread, 9c...
Ring fitting groove, 10... Power supply section, 11... Feeder wire, 11a... Core wire, 11b... Braided wire, 12
...Earth mounting tube, 13...Tightening screw, 13a...
...Male thread part, 14...Synthetic resin tube, 15...
...Connection tube, 16...Vehicle body, 16a...Mounting hole, 17...Mounting base, 18...Mount member, 18a...Ring groove, 18b...Screw hole, 1
9...O-ring, 20...Mounting screw, 21...Earth plate, 21a...Cylindrical projection.

Claims (1)

[Scope of utility model registration request] A synthetic resin molded part with a power feeding tube on the inner periphery and a base nut on the tip, a power feeding part on a part of the outer periphery, a flange protruding from the outer periphery of the tip, and a power feeding spring part on the inner periphery of the middle part. bulge out to form a small diameter part at the end, and further form a cut along the axial direction from the tip side to the end of the power supply spring part, and axially slide the power supply tube of the synthetic resin molded part. A spring tube is movably inserted and supported, and a stopper is provided at the distal end of the spring tube, the stopper abutting the small diameter portion of the spring tube from the distal side. An antenna element is inserted into the tube so as to be slidable in the axial direction, and a flange of the spring tube is sandwiched between a base nut provided on the synthetic resin molded part, and the base nut is tightened, and the antenna element is movable in the axial direction. and a tightening screw inserted into the
An on-vehicle antenna device characterized in that the antenna element and the spring tube can be detached from the synthetic resin molded part by removing the tightening screw.