JPH0210650Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to an antenna device for vehicles, etc.

[Conventional technology]

Utility Application No. 59-68798 (Showa
(filed on May 11, 1959) was previously proposed by the applicant of the present invention. As shown in FIGS. 4 and 5, in this antenna device, a telescopic rod antenna element 2 is fitted and supported in a shield pipe 1 in a detachable and axially movable manner, and the shield pipe 1 is attached to an outer tube assembly 3 at its tip. It is removably inserted from the side.
Further, the shield pipe 1 has a distal end portion 4 made of an insulating material such as insulating rubber that is integrally molded with a metal power supply tube 5.
A small diameter portion 5a for preventing the antenna element 2 from being pulled out is formed at the base end of the antenna element 2, and a stopper 6 provided at the base end of the antenna element 2 is engaged with this small diameter portion 5a, thereby preventing the antenna element 2 from being pulled out. It's stopped. The feeding spring 7, which is fixed to the inner circumferential surface of the feeding tube 5 or formed by cutting and cutting a part of the feeding tube 5, is pressed against the outer circumferential surface of the base pipe 8 of the antenna element 2, so that the base pipe 8 can slide. I support it. In the outer tube assembly 3, an insulator 10 made of synthetic resin is integrally molded on the inner circumferential surface of the distal end of the outer tube 9 made of metal, and a power supply spring 11 connected to the radio side is attached to the inner circumferential surface of the insulator 10. The tube protrudes from the tube 5 and is slidably pressed against the outer peripheral surface of the power supply tube 5 . The distal end of the shield pipe 1 is fastened and fixed to the distal end of the outer tube assembly 3 by a nut 12 which is screwed into the outer tube 9 of the outer tube assembly 3. Furthermore, the applicant of the present invention had previously proposed Utility Model Application No. 127863/1983 (filed on August 23, 1988). As shown in FIGS. 6 and 7, in which parts corresponding to those in FIGS. 4 and 5 are given the same reference numerals, this antenna device has a telescopic rod antenna element 2 secured to a shield pipe 1 made of synthetic resin. The shield pipe 1 is fitted into the outer tube assembly 3 so as to be removable from the distal end side of the outer tube assembly 3, and the shield pipe 1 is fitted onto the inner circumferential surface of the outer tube 9 of the outer tube assembly 3. The provided feed spring 11 is passed through the spring hole 1a provided in the shield pipe 1, and then the base pipe 8 of the antenna element 2 is inserted.
It is slidably pressed against the outer peripheral surface.

[Problem that the invention attempts to solve]

However, in the former antenna device, the feeding spring 1
1 and the power supply tube 5 are in contact with each other, and the power supply tube 5
In addition, since the power supply tube 5 is made of metal, the capacitance increases.Furthermore, the axial length of the nut 12 becomes longer, and the shield pipe 1 including the power supply tube 5 The problem was that the processing costs were high. Although the latter antenna device can improve the above-mentioned problems of the former, since the feeding spring 11 is brought into contact with the base pipe 8 of the antenna element 2 through the spring hole 1a of the shield pipe 1, the shield pipe 1 There was a problem in that the power supply spring 11 was likely to get caught on the shield pipe 1 and be damaged when the power supply spring 11 was inserted or removed. The present invention solves the above-mentioned problems, and the feeding spring is less likely to be damaged when replacing the antenna element, and since the feeding spring and the base pipe of the antenna element are in sliding contact, poor contact is less likely to occur, and the capacity can be increased. It is an object of the present invention to provide an antenna device in which antenna elements can be easily replaced.

[Means to solve the problem]

In order to achieve the above object, the antenna device of the present invention includes a guide pipe made of synthetic resin in which a telescoping rod antenna element is inserted and supported so as to be movable in the axial direction without being removed, and the guide pipe is attached to an outer tube assembly. The antenna device is removably inserted into the assembly from the distal end side, and is provided with a feeding spring and a guide groove along the axial direction on the inner peripheral surface of an insulator constituting the inner peripheral part of the outer tube assembly. , a notch opening at the base end of the guide pipe and extending along the axial direction is fitted into the feed spring, a guide protrusion formed on the outer peripheral surface of the guide pipe is fitted into a guide groove of the insulator, and a cutout of the antenna element is fitted into the feed spring. The outer peripheral surface of the base pipe is slidably pressed against the base pipe.

[Function] In the antenna device of the present invention, a guide pipe corresponding to the shield pipe is provided with a notch that opens at the base end, a feeding spring is fitted into the notch, and the guide convex portion formed on the outer peripheral surface of the guide pipe is connected to the insulator. Since the insulator and guide pipe are positioned in the circumferential direction when replacing the antenna element, the insulator and guide pipe are positioned in the circumferential direction, making the replacement work of the antenna element easy. It is less likely to be damaged, and since the feeding spring and the base pipe of the antenna element come into sliding contact with each other due to the expansion and contraction movement of the antenna element, poor contact is less likely to occur.Furthermore, the advantage of using the guide pipe made of synthetic resin can be obtained.

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In these figures, the same reference numerals as in Figs. 4 to 7 indicate corresponding parts, and the reference numeral 1
Reference numeral 3 denotes a distal insulator, which is fitted and fixed to the distal end of the proximal insulator 15 to form the insulator 10. On the inner peripheral surface of the tip side insulator 13, spring grooves 13a and guide grooves 13b facing each other in the circumferential direction are alternately formed and extend along the axial direction.
A power supply spring 11 having two axially long blades provided on the proximal insulator 15 is housed in 3a. In addition, mutually opposing guide protrusions 14b provided along the axial direction on the outer peripheral surface of a guide pipe 14 made of an integrally molded product of synthetic resin such as fiber-reinforced plastic are slidably fitted into the guide groove 13b. Notches 14a provided opposite to each other in the circumferential direction of the guide pipe 14 open at the base end of the guide pipe 14 and extend in the axial direction. It is fitted. The outer tube 8 of the antenna element 2, which is fitted and supported by the guide pipe 14 so as to be movable in the axial direction, is slidably pressed into contact with the feed spring 11. Note that the configuration of this embodiment other than that described above is substantially the same as that of the antenna device shown in FIGS. 4 and 5. In this embodiment, the outer tube assembly 3 is constructed by inserting the distal insulator 13 made of polypropylene into the distal end of the outer tube 9 made of aluminum, pulling it out to reduce the diameter, and then inserting the distal insulator 13 made of polypropylene into the distal end of the outer tube 9 made of aluminum. 15 is integrally molded from synthetic resin. When the antenna device of the embodiment configured as described above is used while being fixed to the body of a car, the base pipe 8 slides directly on the power supply spring 11 by expanding and contracting the antenna element 2, so that rainwater etc. Even if it enters between the pipe 8 and the power supply spring 11, the power supply spring 11 is unlikely to rust or corrode, and contact failures and power supply failures caused by these will not occur. Furthermore, when inserting the antenna element 2 into the outer tube assembly 3, the tip side insulator 13
The guide protrusion 1 of the guide pipe 14 is inserted into the guide groove 13b of the guide pipe 14.
4b and inserting the guide pipe 14 into the insulator 10, these are positioned in the circumferential direction, so the notch 14a and the power supply spring 11 are reliably fitted, and therefore the workability is good and the power supply is easy. It is possible to reliably prevent the spring 11 from being damaged by the guide pipe 14.

[Effect of the idea]

As explained above, according to the present invention, since a guide pipe made of synthetic resin is used, poor contact between the power supply spring and the power supply tube due to the use of a shield pipe having a metal power supply tube in the previous example may occur. , problems such as an increase in capacitance can be solved, and the guide pipe has a notch that opens at the base end and extends in the axial direction, and the feeding spring is fitted into the notch, so the antenna The power supply spring will not be damaged when replacing the element, especially when installing it, and the guide pipe can be fitted into the insulator with little resistance when replacing the element.
Since these positions in the circumferential direction can be easily determined, it is possible to provide an antenna device in which the antenna element can be easily replaced.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinal side view showing the main parts of an antenna device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the insulator, Fig. 3 is a cross-sectional view of the guide pipe, and Fig. 4. FIG. 5 is a half-cut side view of the tip of the same antenna device; FIG. 6 is a half-cut side view of the main portion of the antenna device of another prior example; The figure is an exploded perspective view showing the same shield pipe and power supply spring. 1... Shield pipe, 1a... Spring hole, 2
... Telescopic rod antenna element, 3 ... Outer tube assembly, 4 ... Tip of shield pipe, 5 ... Power supply tube, 5a ... Small diameter part, 6 ... Stopper, 7
... Power supply spring, 8 ... Base pipe, 9 ... Outer pipe,
10...Insulator, 11...Power supply spring, 1
2... Nut, 13... Tip side insulator,
13a... Spring groove, 13b... Guide groove, 14
...Guide pipe, 14a...Notch, 14b...
Guide protrusion, 15... Proximal insulator, 15
a...Power supply section.

Claims (1)

[Scope of utility model registration request] An antenna device in which a telescopic rod antenna element is fitted and supported in a guide pipe made of synthetic resin so as to be movable in the axial direction while being prevented from coming out, and the guide pipe is fitted into an outer tube assembly so that it can be attached and detached from the distal end side of this assembly. A power supply spring and a guide groove along the axial direction are provided on the inner peripheral surface of the insulator constituting the inner peripheral part of the outer tube assembly, and a notch opens at the base end of the guide pipe and runs along the axial direction. is fitted into a feeding spring, a guide protrusion formed on the outer circumferential surface of the guide pipe is fitted into a guide groove of the insulator, and the outer circumferential surface of the base pipe of the antenna element is slidably pressed into contact with the feeding spring. antenna device.