JPS5819161B2 - electric telescopic antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric telescoping antenna in which a telescoping antenna element, in which, for example, a plurality of conductive tubes of different diameters are slidably connected to each other, is telescopically operated by a wire conveyed by a motor.

In conventional antennas of this type, one end of a wire made of synthetic resin or the like is connected to the drive end of the antenna element, and the other end of the wire is connected to a pulley that is rotationally driven by a motor and the circumferential surface of this pulley. A wire transfer mechanism is known in which the wire is transferred in the longitudinal direction by a wire transfer mechanism consisting of a suppressing piece that presses the wire.

With the above configuration, the wire is driven at a position relatively close to the drive end of the antenna element, compared to one in which the other end of the wire is wound or unwound on a rotating drum. There is little possibility that the wire will bend or meander due to the load or the like.

However, since the transfer force of the wire depends on the frictional force with the pulley circumferential surface obtained by the pressing force of the suppressing piece, there is a risk of the wire and the pulley circumferential surface slipping when the load is large. be.

Particularly when the antenna is used in a cold region, if the antenna freezes inside the housing cylinder, the antenna element cannot be extended outside the housing cylinder.

In such cases, the antenna element is generally extended after being heated with boiling water or other means to remove the frozen state, but in an emergency, it is recommended to temporarily apply excessive current to the motor. However, there are many cases where it is desired to extend the antenna element using the motor power itself.

The present invention has been made in consideration of these circumstances, and an object of the present invention is to provide an electric telescopic antenna equipped with a wire transfer mechanism that can reliably transfer an antenna element driving wire without slipping. .

Hereinafter, the present invention will be explained in detail by an example in which the present invention is applied to an antenna for an automobile.

FIG. 1 is a diagram showing a schematic configuration of an embodiment of the present invention.

In this FIG. 1, 1 is a plurality of conductive tubes 1a having different diameters.
, 1b, and 1c are slidably connected to each other.

When the antenna element 1 is contracted, all the rods 1a, 1b, and 1c are completely housed in the antenna element housing cylinder 2.

The storage cylinder 2 has its upper end fixed to the vehicle body wall 5 by mounting elements 3 and 4.

An antenna element drive mechanism 6 is attached to the lower end of the storage tube 2.

This mechanism 6 includes a DC motor 7, a wire transfer mechanism 8 which is rotated in forward and reverse directions by the motor 7, and a wire transfer mechanism 8.
A wire 9 is provided so as to lead into and out of the antenna element storage cylinder 2.

In other words, this antenna element drive mechanism 6 pushes out the telescopic rod antenna element 1 to the outside of the storage tube 2 or pulls it into the storage tube 2 using the wire 9 guided into and out of the storage tube 2. be.

One end of a power feeding cable 11 made of a coaxial cable or the like is connected to a power feeding section 10 provided near the upper end of the antenna element storage cylinder 2.

An insertion plug 12 for connecting the cable 11 to a transmitter/receiver or the like (not shown) is attached to the other end of the power supply cable 11.

FIG. 2 is a diagram showing the structure of the main parts of the wire transfer mechanism 8 in this embodiment.

In FIG. 2, reference numeral 13 indicates a wire transfer pulley.

This pulley 13 rotates forward and backward about a shaft 14 by being supplied with driving force from the motor 7 via a clutch, and has teeth 13a on its circumferential surface.

On the other hand, the wire 9 is made of a material having appropriate elasticity and hardness, such as hard synthetic resin, and meshes with the teeth 13a of the pulley 13 in the longitudinal direction within a circumferential area of the circumferential surface. Teeth 9a are formed.

A wire guide 15 is provided at a location where the wire 9 is wound around the pulley 13.

This wire guide 15 is made of a material such as hard synthetic resin or metal, and corrects the twisting of the wire 9 so that the teeth 9a of the wire 9 accurately face the circumferential direction of the pulley 13. This is for applying a predetermined pressing force to the back surface of the wire 9 in order to bring the wire 9 into close contact with the peripheral surface of the pulley 13.

Note that in order to positively apply the above-mentioned pressing force, a spring (not shown in the figure) is provided on the back side of the guide 15, and this spring always applies a pressing force to the guide 15 toward the axis of the pulley 13. Just do it.

3A and 3B are diagrams for explaining a means for correcting the twist of the wire 9 by the wire guide 15, in other words, a means for preventing the wire 9 from rotating around the axis.

As is clear from FIGS. 3a and 3b, a groove 9b is formed in the back surface of the wire 9 along the longitudinal direction.

Further, the wire guide 15 is provided with a protrusion 15b that fits into the groove 9b of the wire 9 on one side of the rectangular base 15a, that is, on one side that contacts the back surface of the wire 9.

Next, the expansion and contraction operation of the antenna of the present invention configured as described above will be explained.

First, the operation when extending the antenna element 1 will be explained.

When the power is turned on and the motor 7 is rotated in the forward direction, the pulley 13 in the wire transfer mechanism 8 is accordingly rotated in the direction indicated by the arrow in FIG.

The wire 9 is therefore transported in the direction indicated by arrow C.

At this time, the wire 9 is inserted into the guide 15 in the groove 9b of the wire 9.
Since the wire 9 is transferred with the protrusion 15b recessed, the teeth 9a of the wire 9 are always directly facing the circumferential surface of the pulley 13 when the wire 9 passes through the circumferential surface of the pulley 13. become.

Therefore, the tooth portion 13a provided on the peripheral surface of the pulley and the tooth portion 9a of the wire 9 mesh reliably, and no slipping or the like occurs.

In this way, the wire 9 is reliably transferred in the C direction as the pulley 13 rotates.

When the wire 9 is transferred in the direction C, the tip of the wire 9 reaches the drive end of the antenna element 1 housed in the housing tube 2, that is, the smallest diameter rod 1 of the antenna element 1 in this embodiment.
Push up the proximal end of a.

- Therefore, the antenna element 1 is pushed out of the housing cylinder by the wire 9 from the smallest diameter rod to the larger diameter rods.

When the antenna element 1 is completely pushed out from the storage tube 2, the wire 9 can no longer be transferred.

Therefore, rotation of the pulley 13 is also prevented, but since the clutch mechanism is activated and the clutch is disengaged, the motor 7
is idling.

Thereafter, a well-known limit switch is activated to cut off the power to the motor 1, so that the motor 7 stops rotating.

Next, the operation when reducing the size of the antenna element 1 will be explained.

When the power is turned on and the motor 7 is rotated in reverse, the pulley 13 in the wire transfer mechanism 8 is rotated in the reverse direction in the direction indicated by arrow B in FIG.

The wire 9 is therefore transported in the direction indicated by the arrow.

At this time, the wire guide 15 ensures that the teeth 9a of the wire 9 mesh with the teeth 13a of the pulley 13, just as in the case described above, so the wire 9 is reliably transferred in accordance with the rotation of the pulley 13. Ru.

As the wire 9 is transferred, the antenna element 1 is successively drawn into the storage tube 2 from the smallest diameter rod to the larger diameter rod, and the antenna element 1 is completely stored in the storage tube 2. Then, the wire 9 becomes unable to be transferred.

Therefore, the pulley 13 also stops rotating.

When such a state occurs, the clutch is disengaged and the motor 7 becomes idle in the same manner as described above, and then a limit switch or the like is activated to stop the rotation.

In this way, in the antenna of the present invention, the wire 9 is transferred as if it were a pinion and a rack, so there is no risk of slipping between the pulley and the wire as in the conventional case, and the wire 9 is transferred reliably. be done.

In addition, since the wire is driven near the drive end of the antenna element 1 and the wire guide 15 corrects twisting of the wire 9, the wire 9 is It has the advantage of not having to bend.

Therefore, in a cold region, the antenna element 1 is
Even if ice forms inside the antenna element 1, it is possible to extend the antenna element 1 using only the driving force of the motor 7 without taking special measures to melt the ice.

Note that the present invention is not limited to the above-mentioned embodiment.

For example, in the above embodiment, the shape of the wire 9 is such that a tooth portion 9a is formed on one side of the cylindrical body and a groove 9b having a rotation prevention function in the axial direction is formed on the other side.
As shown in the figure, a tooth portion 16a is formed on one side of a prismatic body 16, or a tooth portion 17a is formed on one side of a semi-cylindrical body 17 as shown in the figure. good.

In short, in relation to the wire guide 15, it is sufficient that the wire 9 is formed such that the toothed portion 9a of the wire 9 always faces the toothed portion 13a of the pulley 13.

Furthermore, in the above embodiments, a telescoping type antenna element in which conductive tubes of different diameters are slidably connected to each other through the antenna element was exemplified, but other types of telescoping type antenna elements may be used.

Further, in the above embodiment, the teeth are provided on the peripheral surface of the pulley, but the teeth may be formed on the side surface of the pulley.

It goes without saying that various other modifications can be made without departing from the gist of the present invention.

As explained above, according to the present invention, the wire for driving the antenna element is transported in the relationship between the pinion and the rack.
It is possible to provide an electric telescopic antenna that can stably and reliably transport a wire without causing slippage between the pulley and the wire even when the load is large.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a schematic configuration of an embodiment of the present invention;
Figure 2 is a side view showing the main structure of the same embodiment, Figure 3a,
FIG. 4b is a perspective view simulating the structure of the wire and guide of the same embodiment, and FIGS. 4a and 4b are perspective views simulating modifications of the wire shape of the present invention, respectively. 1... Telescopic rod antenna element, 2...
...Antenna element storage tube, 3 and 4...Mounting element, 5...Car body wall, 6...Antenna element drive mechanism, 7...Motor, 8...
Wire transfer mechanism, 9... Wire, 10...
...Power supply unit, 11...Power supply cable, 12...
...Plug, 13...Pulley for wire transfer, 13a...Teeth of the same pulley, 14...
...Shaft, 15...Wire guide, 15a.
...Teeth of the same guide, 16.17...Wire.

Claims (1)

[Claims] 1. A telescoping antenna element, a wire having one end connected to the drive end of the antenna element and having teeth formed on its circumferential surface, and the wire being held in a non-rotating state around the axis and guided in the longitudinal direction. An electric motor, characterized by comprising a wire guide, a wire transfer pulley that engages teeth formed on the circumference with teeth of a wire guided by the wire guide, and a motor that rotates the pulley. Telescopic antenna.