JPH0321046Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" The present invention relates to the invention of an electrically operated antenna, which greatly simplifies and compacts the structure of an electrically operated antenna that is automatically extended and retracted, and which also has an appropriate extension and contraction operation. The present invention aims to provide a mechanism that is advantageous in terms of equipment for the vehicle body.

Industrial field of use A mechanism that automatically expands and contracts the antenna element using a motor.

Conventional technology It has been common practice in the past for antennas installed in vehicles to extend and retract the antenna element using a motor. The antenna installed outside the vehicle body can be expanded and contracted while sitting on the vehicle. That is, as a mechanism for extending and contracting the antenna, a motor is provided on the side of the antenna element, and a space is formed below the antenna element group to accommodate the wire or rope connected to the uppermost antenna element. The wire or rope is expanded and contracted using a drum or wheel driven by the motor.

In order to avoid the disadvantages of the conventional general ones as mentioned above,
In the above, a screw shaft driven by a motor and a nut engaged with the screw shaft are used, and the antenna is expanded and contracted using the vertical movement of the screw shaft screwed into the nut that is fixed in the axial direction, or the antenna is expanded and contracted in the axial direction. It has been proposed that a nut is raised and lowered by a screw shaft that rotates without moving, and that the antenna is raised and lowered by the operation of the nut.

Problems to be Solved by the Invention However, in the conventional device as described above, the motor is provided protruding in the shape of a hump on the side of the case housing the drum or wheel, and the motor shaft and the drum or wheel are connected to each other. An interlocking mechanism and a clutch mechanism are also essential between the vehicle and the vehicle, making the structure of the mechanism quite complex and large in size. Naturally, it is expensive and there are restrictions on how it can be installed on the vehicle body. Even when it is installed in such a limited position, it often comes into contact with peripheral equipment, resulting in various problems.

The above-mentioned Utility Model Publication No. 18441 and Japanese Patent Application Publication No. 59-
127405 does not require a wire drum or its case, but the rectangular collar for raising and lowering the threaded rod or the guide means for engaging the nut has a length that covers the extension and contraction stroke of the antenna. In either case, such guide means protrudes greatly into the vehicle body,
Particularly, in the one of U.S. Pat.

"Structure of the invention" Means for solving the problem A motor having a drive shaft through which an antenna element or a wire, rope, or rod connected to the antenna element is inserted, and an umbrella provided concentrically with the drive shaft of the motor. An electric antenna comprising a pair of worm gears having a gear, which rotates while engaging with the bevel gear, and the above-described antenna element or a wire, rope, or rod connected to the antenna element is sandwiched and engaged with the pair of worm gears. .

Operation When the drive shaft of the motor rotates, the bevel gear rotates, and the rotation of the bevel gear rotates a pair of worm gears, and the antenna element or antenna that is clamped and engaged with such worm gears. The wire, rope, or rod connected to the element is moved in its axial direction to expand and contract the antenna.

That is, the motor is rotated forward or backward as appropriate, thereby extending or retracting the antenna element.

The rod used to expand and contract the antenna element is made of flexible synthetic resin material.
Various proposals have also been made regarding the use of flexible members as antenna elements.
It is possible to store the rods and the like that are pulled in when the antenna is retracted without protruding into the vehicle body.

Examples Specific embodiments of the present invention as described above are explained as shown in the attached drawings.
As shown in FIG. 1, a motor 10 consisting of a magnet 11 and a rotor 12 is installed along the axial direction of the antenna element 1, and a drive shaft 13 that operates integrally with the rotor 12 is made hollow and the antenna element 1 is inserted therethrough. A bevel gear 14 is attached to the drive shaft 13, worm gears 2, 2 that engage with the bevel gear 14 are arranged, and the antenna element 1 is sandwiched and engaged with these worm gears 2, 2. The case 5 housing the motor 10 as described above is attached to a vehicle body 6 or the like by means of a mounting body 7.

The antenna element 1 shown in FIG. 1 is a single unit, and the worm gears 2, 2 are directly clamped and engaged with the antenna element 1, but the antenna element 1 according to the present invention has a multi-stage hollow structure. In the case where the antenna elements 1a, 1b, . That is, in such a multi-stage antenna element 1a...1n, the uppermost element 1a itself or the wire or rope or rod 3 attached to the uppermost element 1a is replaced by the worm gears 2, 2 in place of the antenna element 1 in the case of FIG.
In this way, even in the case of multi-stage antenna elements 1a to 1n, the same configuration and operational relationship as in FIG. 1 can be obtained.

That is, when the motor 10 operates, the drive shaft 1
3. The worm gears 2, 2 are driven via the bevel gear 14, and the worm gears 2, 2 as shown by the arrow a in FIG.
Antenna element 1 or wire 3 sandwiched and engaged with 2
can be expanded and contracted.

"Effects of the invention" It is clear that the invention as explained above allows the antenna element to be expanded and contracted appropriately, and furthermore, the motor is provided along the axial direction of the antenna element 1. Since the case 5 is only covered, the structure is mechanically very simple and very compact, and the product can be provided at low cost. By adopting these conditions, it can be bent appropriately within the vehicle body, and there are few restrictions on the equipment position in the vehicle body, and it has the advantage of being preferable for use inside the vehicle. It's a big idea.

[Brief explanation of the drawing]

The drawings illustrate the technical content of the present invention, and
Fig. 1 is a partially cutaway side view showing an example of the device according to the present invention, Fig. 2 is a perspective view of the bevel gear and worm gear portion, and Fig. 3 is an antenna portion showing an example of the case for a multi-stage antenna element. FIG. However, in these drawings, 1 and 1a,
1b...1n are antenna elements, 2 is a worm gear,
3 is a wire or rope or rod, 5 is a case, 10 is a motor, 11 is a magnet, 12 is a rotor,
13 is a drive shaft, and 14 is a bevel gear.

Claims (1)

[Scope of utility model registration request] It has a motor having a drive shaft through which the antenna element or a wire, rope or rod connected to the antenna element is inserted, and a bevel gear provided concentrically with the drive shaft of the motor, which engages with the bevel gear. An electric antenna characterized in that the above-mentioned antenna element or a wire, rope, or rod connected to the antenna element is sandwiched and engaged with a pair of rotating worm gears.