JPS6033609Y2 - Electric telescopic antenna device for automobiles - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric telescopic antenna device for automobiles.

[Conventional technology]

Although there are various types of electric antenna devices of this type, at present they are only installed in luxury cars.

[Problem that the invention attempts to solve]

There are reasons for this as described below.

First, an antenna that automatically expands and contracts is convenient, but it has a complicated structure, requires a large number of parts, and a large number of processing steps, which not only increases the chance of failures, but also increases the number of failures compared to normal manual antennas. Therefore, the cost increases by about w times.

Therefore, at a time when there is a call for resource saving and cost reduction in all parts of the military, it is only being used in a small number of luxury cars that pursue comfort.

Second, there is a strong tendency for modern cars to seek comfort by adding additional equipment. For example, many cars now have air conditioners, power steering equipment, etc. installed as standard in the engine compartment, so the motor drive part of the antenna There is no longer any room for installation in a large, spacious space.

Moreover, due to recent pollution control measures, complex devices and wiring have been incorporated into various parts including the engine room.
There is no space to install the motor drive unit.

In addition, when looking for possible locations for installation, we found that the mounting plate is thin in order to save resources and reduce the weight of the vehicle body, making it difficult to install conventional large and heavy electric telescopic antenna devices even in large passenger vehicles. With no changes in the current situation, it is becoming almost impossible to install them on popular cars.

[Means for solving problems]

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to attach a multi-stage antenna pole to an antenna storage tube that is telescopically inserted above the frame and cover, and to attach it to the support shaft inside the frame. A rotary drum having a spur gear on its outer circumferential surface is rotatably mounted, and one end of a flexible drive cord wound around the rotary drum is connected to the multi-stage antenna, and the spur gear is connected to a fixed shaft in the frame. A small spur gear and a worm wheel are inserted in close proximity to each other so as to be rotatable, and a protrusion of an engagement plate loosely fitted on a fixed shaft and biased by the elasticity of a coil spring is inserted between the worm wheel and the small spur gear into a worm wheel. A torque limiter that elastically contacts the protrusion in the arc-shaped engagement groove of the spur gear from the through hole of the wheel.
By providing the device and engaging the worm of the drive motor with the worm wheel, the number of parts can be reduced, the size and weight can be reduced, and the product price can be made low, thereby promoting the spread of this type of electric telescopic antenna. be.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 to 3, the electric telescopic antenna device 1 for automobiles of the present invention has a frame 2 and a cover 3 assembled together with their hands together, and an antenna housing tube 4 screwed to the upper inside of the frame 2. A telescopic multi-stage antenna pole 5 is slidably inserted into the antenna storage pipe 4, and a support shaft 6 protruding inward from the frame 2 has a spur gear 7 on its outer peripheral surface. A rotating drum 8 is rotatably mounted.

One end is fixed to this rotating drum 8 and a flexible drive cord 9 is wound around it, the other end of this drive cord 9 is connected to the uppermost part of the multistage antenna 5, and the inner surface of the frame 2 is fixed. A small spur gear 11 that meshes with the spur gear 7 and a worm wheel 12 are rotatably inserted into the shaft 10.

A torque limiter device 13 is provided between the rotation transmission path of the worm wheel 12 and the small spur gear 11, and the worm 15 of the drive motor 14 is connected to the worm wheel 12.
It is made up of a combination of.

Both the frame 2 and the cover 3 have a flat shape, are integrally molded by die-casting, and are assembled together by a fixing screw 22 screwed into the support shaft 6 and other screws.

Note that the hole 32 at the bottom of the cover 3 is for draining water.

The antenna housing tube 4 is made of a metal pipe or the like, is inserted into the upper mounting hole 23 and the housing hole 24 of the frame 2, and is fixed with a set screw 25.

The multi-stage antenna pole 5 is constructed such that thinner parts are slidably inserted in succession into a thicker pipe-shaped antenna pole, and do not come out in the extending direction.

The rotating drum 8 is made of polypropylene, for example, and is integrally molded with the spur gear 7 having a large outer circumferential surface, and forms a winding drum 26 on the outer circumferential surface of a U-shaped annular groove.

The flexible drive cord 9 has one end fixed to the winding drum 26, and is wound around the winding drum 26 several times, and the other end is led out from the guide part 27 of the frame 2 and connected to the multistage antenna pole 5. It is joined to the bottom end of the top one.

The drive motor 14 can be rotated in either forward or reverse direction by operating a switch.

Further, the torque limiter device 13 is a mechanism that transmits rotational force below a certain torque and does not idle and transmit rotation when a load exceeds the specified torque.As shown in FIG. 4, 1. An engagement plate 16 is loosely fitted to the fixed shaft 10, and the engagement plate 16 is biased by a coil spring 17 compressed between the engagement plate 16 and a spring seat 29 corresponding to the stepped portion 28 of the fixed shaft 10.
Insert the protrusion 18 of the engagement plate 16 into the engagement groove 20 on the side surface of the small spur gear 11 through the through hole 19 of the worm wheel 12, and make it abut against the side surface of the protrusion 21 as a discontinuous part of the engagement groove 20. It is configured as follows.

Note that the protrusion 18 has a coil spring 17 in the engagement groove 20.
The engagement plates 16 are brought into frictional contact due to the elasticity of the engagement plate 16, but the elasticity for this contact may be obtained by constructing the engagement plate 16 from an elastic metal plate.

The small spur gear 11 includes a nut 30 screwed into the fixed shaft 10 and a plurality of washers 3 interposed between them.
1 to prevent it from falling out.

Next, the operation of the antenna device having the above configuration will be explained.

When extending the multi-stage antenna pole 5, when the drive motor 14 is rotated in the forward direction, the rotation is converted into a large torque by the worm 15 and the worm wheel 12 due to the large reduction ratio, and the projection 18 is turned into the engagement groove 20. Part 21
is transmitted from the small spur gear 11 to the spur gear 7.

Here, the rotating drum 8 rotates counterclockwise, unwinds the drive cord 9, pushes it upward, and sequentially extends the multi-stage antenna pole 5 while sliding it.

When the multi-stage antenna pole 5 reaches its maximum extension position, it will not extend any further, so the rotational torque of the rotating drum 8 as a load on the drive motor 14 increases.

Therefore, the protrusion 18 of the engagement plate 16
7, climbs over the protrusion 21, is displaced in the direction of the arrow in FIG. Engagement groove 20
It is idling inside.

If the drive motor 14 is switched off in this state,
At that point, the antenna extension operation is completed.

Furthermore, when the multi-stage antenna pole 5 is to be reduced in size, a switch may be operated to rotate the drive motor 14 in the opposite direction.

In this way, the rotating drum 8 winds up the drive cord 9, so that the multi-stage antenna pole 5 descends sequentially from the upper stage and is housed inside the antenna housing tube 4 in a contracted state.

Even when the multi-stage antenna pole 5 is completely reduced, the torque limiter device 13 performs an idling operation in the same manner as in the above case, thereby avoiding overload of the rotational drive system and protecting the drive motor 14.

If the drive motor 14 is turned off at this point,
The reduction operation will be completed.

[Effect of idea]

The electric telescopic antenna device for automobiles of the present invention provides the following unique effects.

(1) Since the rotating drum, spur gear, worm wheel, and small spur gear are housed in substantially the same plane, the external dimensions of the device are extremely small, and the entire device can be made thin.

Therefore, the product of the present invention can be installed even in a narrow space of a car.

(2) The rotation of the drive motor is controlled by a worm gear and a combination of a large spur gear with the same diameter as the rotating drum and a small spur gear, allowing a high reduction ratio to be obtained with a small number of gear trains.
Even if the torque of the drive motor is small, sufficient torque and expansion/contraction speed are ensured.

For this reason, the drive motor does not need to be a dedicated large-sized motor as in the past, and can be constructed from, for example, a commercially available standard motor for toys.

For this reason, manufacturing becomes inexpensive, and further downsizing and weight reduction are possible.

(3) The torque limiter device uses a small spur gear, a worm wheel, and a part of a fixed shaft, and combines a coil spring and a simple engagement plate, so it can be assembled, manufactured, and maintained with few parts. It is easy to use and works reliably.

(4) Since the rotating drum integrally forms the spur gear and the take-up cylinder, it is strong and durable despite being subjected to a relatively large driving torque.

(5) In addition to the above-mentioned effects, since the component parts share many functions and are organically combined, this device becomes inexpensive, compact and lightweight, and can be popularized in popular cars.

[Brief explanation of drawings]

FIG. 1 is a plan view of the electric telescopic antenna device for automobiles of the present invention, FIG. 2 is a side view of the same device with the cover removed, and FIG. 3 is a sectional view taken along line A-A in FIG. 2. FIG. 4 is an exploded perspective view of the torque limiter device. 1... Electric telescopic antenna device for automobiles, 2...
...Frame, 3...Cover, 4...
... Antenna shrink tube, 5 ... Multi-stage antenna pole, 6 ... Support shaft, 7 ... Spur gear, End ... Rotating drum, 9 ... ... Drive code, 10 ... Fixed shaft, 11 ... Small spur gear, 12 ... Worm wheel, 13.
... Torque limiter device, 14 ... Drive motor, 15 ... Worm, 16 ...
・Engagement plate, 17... Coil spring, 18.
...Protrusion, 19...Through hole, 20...
...Engagement groove, 21...Protrusion.

Claims (2)

[Scope of utility model registration request] (1) Attach an antenna storage pipe into which a multi-stage antenna pole is inserted telescopically above the frame and cover, and attach a rotary drum having a spur gear on its outer circumferential surface to the spindle in the frame, and rotate the drum. Connect one end of a flexible drive cord wrapped around the drum to the multi-stage antenna, and connect it to the fixed shaft within the frame.
A small spur gear and a worm wheel that mesh with the spur gear are rotatably inserted in close proximity, and an engagement plate that is loosely fitted on a fixed shaft and biased by the elasticity of a coil spring is inserted between the worm wheel and the small spur gear. A torque limiter device is provided in which a protrusion is brought into elastic contact with a protrusion in an arcuate engagement groove of a spur gear from a through hole of a worm wheel, and a worm of a drive motor is engaged with the worm wheel. Electric telescopic antenna device for automobiles. (2) An electric telescopic antenna device for an automobile according to claim 1, which is formed by integrally molding a rotating drum and a spur gear.