JPH03726Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is an electric telescoping device that is mounted on a vehicle, etc., and automatically extends and retracts a group of rod antenna elements by a drive cord that is transferred in the longitudinal direction. The present invention relates to a connection device between an antenna element and a drive cord in an antenna.

<Prior Art> Conventionally, as this type of antenna device, a flexible drive cord made of synthetic resin or the like is wound and wound in the longitudinal direction by a drum rotationally driven by a drive source such as a motor. Some antennas are constructed so that the rod antenna element group is expanded and contracted at the end of the drive cord. In the electric telescopic antenna having the above configuration, the connection between the base end of the tip bar located at the innermost part of the rod antenna element group and the antenna side end of the drive cord is as shown in FIG. There is. According to this connection device, an annular recess 2 extending all around the base end 24a of the tip bar 24 is provided.
The base end 24a of the tip bar 24 is attached to the narrow diameter portion 25a of the connecting pipe 25 made of metal.
By fitting and crimping the connecting pipe portion 25a corresponding to the annular recess 24b, the tip bar 24 is prevented from coming off in the axial direction, and the tip bar 24 is assembled so as to be closely opposed to the proximal end 24a of the tip bar 24. The antenna element side end 23a of the drive cord 23 made of resin or the like is connected to the large diameter portion 2 of the connection pipe 25.
5b and caulking the large diameter portion 25b at multiple locations, the tip bar 24 and the drive cord 2
3 is connected and held in a straight line via a connecting pipe 25.

<Problems to be solved by the invention> The tip bar of the antenna device with the above configuration is
Because the tip bar has an extremely small diameter of about 2.8 mm, it is difficult to form an annular recess that extends all the way around the base end of the tip bar, and it is also impossible to form it deep in the core direction. When the connecting pipe corresponding to the annular recess is to be caulked after the base end of the tip bar is inserted into the diameter portion, the connecting pipe must be caulked with a strength and depth that is compatible with the annular concave portion, and the connection pipe and the tip bar must be There was a problem that the bonded state was weak against external force in the axial direction. Therefore, during the expansion and contraction operation of the rod antenna element group, especially when contracting, the strong tensile force of the drive cord is transmitted to the tip bar through the connecting pipe, and as mentioned above, since the connecting pipe is not caulked shallowly, the connecting pipe is Due to restoring force, the tip bar was more likely to come off in the axial direction than the drive cord.

The present invention has been made to solve the above-mentioned problems, and provides a connection device between the tip bar of an antenna element and a drive cord, which can reliably prevent the tip bar from coming off from the connection pipe during expansion and contraction of the rod antenna element group. The purpose is to

<Means for Solving the Problems> In order to achieve the above object, the present invention aims at expanding the bar in the radial direction by forming a plurality of axially long ribs at the base end of the tip bar. The ribs are adapted to engage with the narrow diameter portion of the connecting pipe.

<Function> Since the connection between the tip bar and the drive cord of the electric telescopic antenna device according to the present invention is configured as described above, when the drive cord is transferred in the longitudinal direction, the plurality of connections formed at the base end of the tip bar The ribs are engaged with the narrow diameter portion of the connecting pipe, and are connected and held in a straight line with the end of the drive cord on the antenna element side via the connecting pipe.

<Example> An example of the present invention will be described below with reference to FIG.
This will be explained with reference to FIG. Note that the same or corresponding parts in the figures are given the same reference numerals.

FIG. 1 is a diagram showing a schematic configuration of the present invention mounted on a vehicle body wall 26 such as a fender of a vehicle, and is shown with reference numeral 2.
Reference numeral 0 denotes an electric telescopic antenna which rotates a drum 22 by forward and reverse rotation of a motor 21 serving as a drive source, and enables telescopic operation of a group of rod antenna elements 27 by transporting a drive cord 23. The drive cord 23 has a round bar shape made of synthetic resin or the like, has a diameter of about 0.3 mm to 4.0 mm, and is flexible. proximal end 2 of
4a. FIG. 2 is an enlarged view of the connecting portion between the drive cord 23 and the tip bar 24 shown in the dotted line frame in FIG.
The small diameter part 25 is narrowed to the small diameter part 25a and the large diameter part 25b.
The base end 24a of the tip bar 24 is connected to the narrow diameter part 25a, and the end of the drive cord 23 on the antenna element side is connected to the large diameter part 25b near the constricted small diameter part 25c of the connecting pipe 25. It is fitted into the connecting pipe 25 so as to be opposite to each other. The proximal end 24a of the tip bar 24, which is fitted into the narrow diameter part 25a of the connecting pipe 25, has a plurality of ribs 24c protruding in the axial direction, which are formed by machining. The bar 24 is engaged with the small diameter portion 25c of the diaphragm to prevent the tip bar 24 from coming off toward the tip side.

On the other hand, as described above, the drive cord 23 that is inserted into the large diameter portion 25b is made of synthetic resin and has flexibility, and the end on the antenna element side is connected to the proximal end of the tip bar 24 within the connecting pipe 25. By caulking the large diameter portion 25b of the connecting pipe 25 at multiple locations, the drive cord 2
3 is firmly and integrally connected to the connecting pipe 25. With the above configuration, the tip bar 24 and the drive cord 23 are connected and held in a straight line via the connecting pipe 25 regardless of their mutual diameters.

<Effects> As explained above, according to the present invention, a plurality of ribs are formed in the axial direction at the base end of the tip bar, so unlike the conventional method, an annular recess is provided at the base end and the connecting pipe is not crimped. Compared to drive cord and tip bar connection devices such as the above, this device reliably prevents the tip bar from coming off in the axial direction, and can sufficiently handle the strong tensile force transmitted from the drive cord through the connecting pipe. Yes, there is no need to caulk the narrow diameter part of the connecting pipe, reducing the number of man-hours.The automatic expansion and contraction operation of the rod antenna element is ensured with a structure where the ribs are simply formed by simple machining instead of adding new parts. This has the effect of improving productivity by reducing speed and man-hours.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, FIG. 1 is a schematic side view showing the entire electric telescopic antenna device, and FIG. 2 is an enlarged view of the dotted line frame in FIG. 1. a is a side sectional view, b is A- in a
A sectional view taken along line A', and FIG. 3 is a side sectional view showing a conventional connecting device. 20... Electric telescopic antenna, 21... Motor,
22...Drum, 23...Drive code, 23
a... Antenna element side end, 24... Tip bar,
24a... Proximal end, 24b... Annular recess, 24c
... Rib, 25 ... Connection pipe, 25a ... Small diameter part, 25b ... Large diameter part, 25c ... Squeezed small diameter part,
26... Vehicle body wall, 27... Rod antenna element group.

Claims (1)

[Scope of utility model registration request] In an electric telescopic antenna in which a drive cord is longitudinally transferred by a drive source such as a motor, and a rod antenna element group is automatically extended and retracted, an elongated rib is provided in the axial direction on the outer periphery of the base end of the tip bar of the rod antenna element group. A plurality of ribs are provided protrudingly, and the ribs are engaged with a narrow diameter portion formed on the connecting pipe,
A drive cord in which the proximal end and the end of the tip bar closely face each other is inserted into the connecting pipe and fixed by caulking, and the tip bar of the antenna element and the drive cord are connected and held in a straight line through the connecting pipe. A special feature is the antenna element and drive cord connection device.