JPH0321045Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an antenna driving device for driving a telescoping antenna element to expand and contract, and particularly to a device using a rack rope.

[Conventional technology]

A conventional antenna driving device is constructed as shown in FIG. In the figure, a spring 2 is attached to the drive unit main body 1, and a telescopic antenna element (not shown) is attached to the antenna element side.
A hollow guide 4 that guides the guide 4 and a rack rope 3 attached to the hollow part of the guide 4 are provided. The rack rope 3 has a plurality of racks 3a cut in the length direction on one side thereof, and is moved in the length direction by meshing with a gear connected to a motor provided on the main body side. On the main body side, as shown in FIG. 4, a slit is provided in a part of the drive unit main body 1,
A portion of a U-shaped spring 2 is attached to the slit so as to protrude therefrom. On the other hand, since there is no restraining means interposed between the guide 4 and the easy rope 3, the easy rope 3 is formed into a square shape and inserted into the hollow part of the guide 4, so that the guide 4 and the easy rope 3 can be connected to each other. Prevent rotation.

In such a configuration, when the guide 4 is attached to the main body, a gear (not shown) coupled to the motor is used.
The rack rope 3 slides toward the main body 1 by rotating the rack rope 3 and engaging the rack 3a of the rack rope 3.

Therefore, the guide 4 and the antenna element connected to the rack rope 3 move toward the main body 1 side. At this time, since a recess 4a is formed on the circumference at the tip of the guide 4, the recess 4a engages with the spring 2, and the guide 4 is locked. The guide 4 is thereby attached to the main body 1.

[Problem that the invention attempts to solve]

In such a conventional device, the rack rope 3 must be square, which makes processing difficult and requires high precision. Also, in order to prevent the drive gear from twisting, it is necessary to press the rack rope 3 with your fingers as shown in Figure 3 to engage the gear meshing direction with the rack 3a of the rack rope 3.
Poor workability. At this time, there is a risk of injury due to sudden gear jamming or pulling.

[Means for solving problems]

The antenna drive device of the present invention was devised for the purpose of solving the above-mentioned problems, and includes a guide for attaching an antenna element,
a rack rope for moving the antenna element and the guide; a drive gear provided on the main body side and meshing with the rack of the rack rope; and a mechanical fitting for fixing the guide to the main body with the rack rope sliding toward the main body. and a presser spring that is attached to the guide and has a protrusion that engages with the rack of the rack rope and a tip that contacts the main body, and the rack rope is moved toward the main body by rotation of the drive gear. When the tip of the presser spring comes into contact with the main body, the presser spring is deformed, the engagement between the convex portion and the rack is released, and the mechanical fitting means The present invention is characterized in that a guide is attached to the main body.

[Effect]

In the above means, when the guide is attached to the main body, the rack rope is engaged with the drive gear to rotate the drive gear. At this time, since the convex portion of the presser spring is engaged with the rack of the rack rope, rotation of the rack rope is suppressed. When the tip of the presser spring comes into contact with the main body, the presser spring is deformed and the engagement between the protrusion and the rack is released. At the same time, the guide is attached to the main body by the attachment means. After installation, the antenna element expands and contracts by sliding the rack rope using the drive gear.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the same parts as in FIG. 3 are given the same reference numerals. The main body 1 is provided with a drive gear 5 that meshes with the rack 3a of the rack rope 3, and the gear 5 is rotated by a motor. The cross section of the rack rope 3 can be arbitrary, such as round or square. A pin 6 is provided near the gear 5 to maintain the meshing of the rack rope 3 and guide the rack rope 3 to the gear 5. On the other hand, a presser spring 7 is attached to the guide 4. The presser spring 7 has a convex portion 7a that lightly engages with the rack 3a.
and a tip 7b having a slope substantially the same as the tip 1a of the main body 1 having a predetermined angle of inclination.

In this configuration, when the guide 4 is attached to the main body 1, the tip of the rack rope 3 is guided by the pin 6 so that the drive gear 5 and the rack 3a mesh with each other. After meshing, the drive gear 5 is rotated by a motor to move the rack rope 3, guide 4, and presser spring 7 toward the main body 1 side. At this time, the convex portion 7a of the presser spring 7 is lightly engaged with the rack 3a, and the rotation of the rack rope 3 is suppressed. Convex portion 7a
The rack rope 3 slides while repeating engagement and disengagement with the rack 3a, and the guide 4 and presser spring 7 move toward the main body 1, but the tip 7b of the presser spring 7
comes into contact with the tip 1b of the main body 1, the presser spring 7
is pushed up along the side slope of the tip portion 1b of the main body 1. As a result, as shown in FIG.
The meshing state between the rack 3a and the rack 3a is released, and
The recess 4a of the guide 4 engages with the spring 2, and the guide 4
is secured to the main body 1. Thereafter, as the rack rope 3 slides on the drive gear 5, the antenna element expands and contracts.

[Effect of idea]

As described above, according to the present invention, rotation can be prevented even if the cross section of the rack rope has an arbitrary shape such as round or square, and accuracy of the rack rope is not required. In addition, the rack of the rack rope and the drive gear can be easily engaged with each other, improving safety.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an embodiment of the antenna driving device according to the present invention, Fig. 2 is a view showing the guide in Fig. 1 attached to the main body, and Fig. 3 is a conventional antenna driving device. A sectional side view, and FIG. 4 is a front view showing the main body and spring in FIG. 3. 1...Body, 1a...Tip, 2...Spring, 3
... Rack rope, 3a ... Rack, 4 ... Guide, 5 ... Drive gear, 6 ... Pin, 7 ... Presser spring, 7a ... Convex part, 7b ... Tip part.

Claims (1)

[Scope of utility model registration request] a guide for attaching the antenna element; a rack rope for moving the antenna element and the guide; a drive gear provided on the main body side and meshing with the rack of the rack rope; The device includes a mechanical fitting means that is fixed to the main body, and a presser spring that is attached to the guide and has a protrusion that engages with the rack of the rack rope and a tip that comes into contact with the main body, and that is fixed to the main body by the rotation of the drive gear. When the rack rope slides toward the main body and the tip of the presser spring comes into contact with the main body, the presser spring is deformed and the engagement between the protrusion and the rack is released, and the mechanical An antenna driving device characterized in that the guide is attached to the main body by a fitting means.