JPH0136329Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of an antenna drive device.

[Conventional technology]

Antenna drive devices have been commonly used that extend or retract a drive cord connected to a telescoping rod antenna by operating a cord feeding mechanism by rotating a motor in the forward and reverse directions to raise and lower the antenna. Furthermore, an antenna driving device of this kind has been previously proposed which is equipped with a free drum around which a drive cord extending from the feeding mechanism toward the side opposite to the antenna is wound.

[The problem that the idea aims to solve]

However, the free drum of the prior art merely has an annular cord storage groove with one end open, and the drive cord is pressed against the outer peripheral surface of the cord storage groove by its own elasticity. The cord is wound around the free drum, and the opening of the cord storage groove is almost directly opposite the fixed member.
Because a thrust is applied between the drive cord and the fixed member and the resistance of the free drum increases, only one row of drive cords can be accommodated in the radial direction of the free drum. Therefore, there was a problem in that the diameter and thickness of the free drum increased, and the overall size of the antenna driving device also increased.

The present invention arranges the drive cords in multiple rows in the radial direction of the free drum so that they can be stored in the cord storage groove of the free drum.
It is an object of the present invention to provide an antenna drive device in which the size of the free drum and drive device can be reduced by simply improving the free drum alone.

[Means to solve the problem]

In order to achieve this objective, the present invention includes a drive cord for raising and lowering the antenna, a cord feeding mechanism that is operated by a forward and reverse electric motor to feed out and pull the drive cord, and a cord feeding mechanism that extends from the feeding mechanism toward the side opposite to the antenna. An antenna drive device comprising a free drum around which a drive cord is wound, the free drum having an annular cord storage groove whose one end face is open facing the fixing member, and an open end of the cord storage groove. The present invention is characterized in that a flange-like or a plurality of claw-like cord restraints protruding from the outer periphery toward the inner periphery are integrally formed, and a guide is provided for guiding the drive cord obliquely from the outside to the free drum.

[Effect]

With the above configuration, the drive cord guided to the free drum via the guide can be wound in multiple rows on the cord storage groove, and no thrust is applied to the fixing member due to the cord restraint.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 3, reference numeral 1 denotes a housing of the antenna driving device, and within this housing 1 is fixed an electric motor 2 that rotates forward and backward, and a code feeding mechanism operated by this electric motor 2. 3 is accommodated. This code feeding mechanism 3 is connected to the shaft 4 of the electric motor 2.
A worm shaft 5 is connected to the worm shaft 5, a worm wheel 6 that meshes with the worm shaft 5 is pivotally supported by a housing 7 described later, a V-groove wheel 8 is provided coaxially with the worm wheel 6, and a V-groove wheel 8 is provided opposite to the worm wheel 8. A drive cord 10 for raising and lowering the antenna is held between a pinch roller 9 and a pinch roller 9 disposed at the antenna.

The pinch roller 9 is pivotally connected to the arm 11,
The arm 11 has one end pivotally supported by the housing 7, the other end connected to the housing 7 by a tension spring 12, and the pinch roller 9 is pressed against the V-groove wheel 8 side. The housing 7 is movable in the direction of movement of the drive cord 10, with upper corner portions 7a and 7b supported by support portions 1a and 1b of the casing 1, and lower lateral portions 7c and 7d formed into partitions fixed within the casing 1. The engaging recess 7 is supported on a plate (fixing member) 13 to restrict movement in the vertical and horizontal directions, and is formed on the opposite side of the pinch roller 9 of the housing 7.
An engaging element 14 is removably engaged with one of the elements e and 7f, is supported on the housing 1 side, and is pressed against the engaging recess 7e by a spring 15.

Further, one end of the drive cord 10 held between the V-groove wheel 8 and the pinch roller 9 extends outside the housing 1 via a guide tube 16 and is connected to a telescopic rod antenna (not shown).
0 is curved in an arc shape by a guide 21, which will be described later, and is wound around the free drum 17. As shown in FIG. 3, the free drum 17 is rotatably attached to the housing 1 by a pivot 18 at its center, and a cord storage groove 19 whose upper end surface is open close to the partition plate 13 is attached to the pivot 18. A collar-shaped cord restrainer 20 is integrally provided with the free drum 17 and is formed in a ring shape concentric with the free drum 17 from the outer periphery of the open end of the storage groove 19 toward the inner periphery. Further, a guide body 21 is provided on the side of the partition plate 13 opposite to the free drum 17 to guide the drive cord 10 to the free drum 17 obliquely from outside. As shown in FIG. 1, this guide body 21 has a semicircular shape in plan view, and has an arcuate drive cord guide groove 21a.
The drive cord 10 guided by the drive cord guide groove 21a is guided into the storage groove 19 through an opening provided in the partition plate 13.

As shown in FIGS. 4 and 5, a switch operator 26 is protruded from the housing 7, and this operator 26 corresponds to a three-pole switch mechanism 22 provided in the circuit of the electric motor 2. As shown in FIGS. This switch mechanism 22
A fixed contact plate 23 is fixed at the center, and movable contact plates 24 and 25 are arranged on both sides of the fixed contact plate 23, and the operator 26 is inserted between both movable contact plates 24 and 25. By moving the operator 26 in accordance with the movement of the housing 7, the movable contact plate 2
4 and 25 can be separated from the fixed contact plate 23.

Next, the operation of the drive device of the embodiment configured as described above will be explained. When the electric motor 2 is rotated forward with the antenna in the contracted state, the shaft 4 rotates in the direction of the arrow in FIG. 1, and the worm wheel 6 is rotated at a reduced speed via the worm shaft 5 with a relatively large torque.
Therefore, the V-groove wheel 8 provided coaxially with the worm wheel 6 rotates in the direction in which the drive cord 10 is fed out, and the drive cord 10 is moved outward from the housing 1 by the action of the V-groove wheel 8 and the pinch roller 9. It is extended and the antenna is extended. When a load exceeding a predetermined value is applied to the drive cord 10 due to the antenna reaching its extension limit, the rotation of the worm wheel 6 integrated with the V-groove wheel 8 is restricted, and the housing 7 moves into the engagement recess 7e. and engager 14
1 and moves downward as shown by the arrow in FIG. As the switch operator 26 moves along with this movement, the operator 26 separates the movable contact plate 24 that was in contact with the fixed contact plate 23 from the fixed contact plate 23 to stop the motor 2, and the movable contact plate 25 is brought into contact with the fixed contact plate 23 by its elasticity, and the motor 2 is connected to the reversing circuit.

When a switch mechanism (not shown) that is different from the switch mechanism 22 is operated in this state, the electric motor 2 is reversed, the V-groove wheel 8 and the pinch roller 9 retract the drive cord 10, and the antenna is reduced.
When a predetermined load or more is applied to the drive cord 10 at the contraction limit, the housing 7 moves upward, the engagement recess 7e is engaged with the engagement member 14, and the switch operator 26 moves the movable contact plate 25 to the fixed contact plate 23. The movable contact plate 24 is brought into contact with the fixed contact plate 23 to connect the motor 2 to the normal rotation circuit.

By the above-described operation, the drive cord 10 is paid out from the cord storage groove 19 of the free drum 17 or wound into the storage groove 19. When the drive cord 10 is wound up, it is guided by the guide groove 21a of the guide body 21 and the cord retainer 20 is shaped like a collar.
The drive cord 10 is guided into the storage groove 19 from the inner peripheral side thereof, is supported by the outer periphery of the storage groove 19 by the elasticity of the drive cord 10 itself, and is wound inside the storage groove 19. In this case, if the collar-shaped cord restrainer 20 is not provided, the drive cord 10 will cause the free drum 17 and the partition plate 1 which is a fixed member to
Thrust is applied between 3 and free drum 17.
Since the rotation of the drive cords 10 receives a large resistance, the drive cords 10 cannot be wound in one row in the radial direction of the storage groove 19 and even up to the opening thereof, but in this embodiment, the drive cords 10 protrude from the outer periphery of the storage groove 19 toward the inner periphery. Since the flange-shaped cord restrainer 20 is integrally provided, the drive cord 1
0 and the partition plate 13, and even after the drive cord 10 reaches the opening of the storage groove 19 and comes into contact with the cord restrainer 20, the drive cord 10 is not pushed toward the center of the already wound part. It can be wound, ie, wound in multiple rows in the radial direction of the free drum 17. Therefore, in this embodiment, the expansion and contraction stroke of the antenna, that is, the diameter and thickness of the free drum 17 relative to the winding length of the drive cord 10 can be made smaller than that without the cord restrainer 20, and this also makes it possible to The housing 1 of the device, that is, the entire drive device can be made smaller.

In the present invention, as shown in FIG. 6, instead of a collar-like cord restrainer extending all around the circumference, a plurality of claw-like cord restrainers 20a are integrally provided in the circumferential direction of the free drum 17 at predetermined intervals. You can also use it as a cord restrainer.
This has the advantage that the free drum 17 can be molded more easily than the case where the free drum 17 is provided with a mold.

[Effect of idea]

As explained above, the present invention has a flange-like or a plurality of claw-like cord restraints that protrude inward from the outer periphery of the open end of the annular cord storage groove provided in the free drum, which is integrally formed with the free drum. Although this free drum has a simple structure in which the drive cord is guided diagonally from the outside by a guide, compared to the free drum without the cord restraint, the free drum has a much shorter free time with respect to the expansion and contraction stroke of the antenna, that is, the winding length of the drive cord. This has the advantage that the diameter and thickness of the drum can be reduced, and the antenna driving device can also be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, Fig. 3 is a cross-sectional explanatory view of the free drum section, Fig. 4 and Figure 5 is a plan view and side view of the switch mechanism, and Figure 6 is a side view of the switch mechanism.
The figure is a plan view of a free drum according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Housing, 1a, 1b... Support part, 2... Electric motor, 3... Cord feeding mechanism, 4... Shaft, 5...
Worm shaft, 6... Worm wheel, 7... Housing, 7a, 7b... Upper both corner parts, 7
c, 7d...lower both sides, 7e, 7f...engaging recess, 8...V groove wheel, 9...pinch roller,
10...Drive code, 11...Arm, 12
... tension spring, 13 ... partition plate (fixing member),
14... Engagement element, 15... Spring, 16... Guide tube, 17... Free drum, 18... Pivot, 19
... Cord storage groove, 20, 20a ... Cord retainer, 21 ... Guide body, 21a ... Drive cord guide groove, 22 ... Switch mechanism, 23 ... Fixed contact plate, 24, 25 ... Movable contact plate, 26...Switch operator.

Claims (1)

[Claims for Utility Model Registration] A drive cord for raising and lowering the antenna, a cord feeding mechanism that is operated by a forward and reverse electric motor to feed out and retract the drive cord, and a drive cord extending from the feeding mechanism to the side opposite to the antenna. In the antenna drive device, the free drum is provided with an annular cord storage groove whose one end face is open facing the fixing member, and the cord storage groove has a ring-shaped cord storage groove that extends from the outer periphery of the open end of the cord storage groove to the inner periphery. 1. An antenna driving device characterized by integrally forming a flange-like or a plurality of claw-like cord restrainers projecting to the side, and provided with a guide for guiding a drive cord obliquely from the outside with respect to the free drum.