JPH04234204A - Telescope type antenna - Google Patents

Abstract

PURPOSE: To obtain a telescopic antenna simplifying the manufacturing and constitution of contact elements and allowed to be used almost without requiring maintenance. CONSTITUTION: The antenna is provided with plural telescopic elements and two telescopic elements, e.g. 11, 12, are mutually mechanically and electrically connected through a spring elasticity contact element 13, which consists of conductive plastic. The element 13 can be provided with smoothness by adding a slidable substance.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a telescoping antenna, which comprises a plurality of telescoping elements, and each two of the telescoping elements are connected to each other via a spring-elastic contact element. It relates to a type of device that is mechanically and electrically coupled and connected to each other.

0002

BACKGROUND OF THE INVENTION A telescopic antenna of the above type is already known (German Patent No. 1955980).
No. Specification). In this telescopic antenna,
The contact element provided between the two telescopic elements is a sleeve welded to the outer side of the inner telescopic element and provided with a slit, which sleeve also spring-elastic contact with the inner wall of the telescoping element. This creates good electrical contact with low contact resistance between both telescope elements, and at the same time provides sufficient frictional force. This frictional force ensures that the damping effect during the telescoping antenna remains as constant as possible during the telescoping antenna over long periods of use. The above-mentioned contact elements and their fixing type allow the telescopic antenna to function satisfactorily, i.e., to work almost without any trouble even under extremely harsh conditions such as high humidity, heavy dirt, and large temperature fluctuations. It has become.

However, this known telescoping antenna also has significant drawbacks. The manufacturing and fixing of the contact elements is very expensive and the regular cleaning of this telescoping antenna using a cleaning cloth or similar impregnated with lubricant and anti-corrosion agent. This means that maintenance work cannot be abandoned. However, in practice, manufacturer-instructed maintenance is often not performed, causing telescoping antennas to deteriorate in performance over time.

0004

SUMMARY OF THE INVENTION It is therefore an object of the invention to improve a telescoping antenna of the type mentioned at the outset in such a way that the production and construction of the contact elements are simplified and it can be used with almost no maintenance. It is an object of the present invention to provide such a telescoping antenna.

[0005]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides that the contact element is made of electrically conductive plastic.

[0006]

The advantages of a telescoping antenna of the type according to the above means are not only that the contact element can be produced relatively easily and that it can be handled relatively easily; It also provides mechanical and electrical connections and connections between telescope elements that require little maintenance.

[0007]The handling of the contact elements is simple, since they only need to be fitted onto the respective inner telescopic element, ie, fixing to the inner telescopic element is no longer necessary. It's based on that. The above generally simplifies the manufacture of telescoping antennas and reduces manufacturing costs.

A preferred field of use for the telescoping antenna according to the invention is vehicle antennas, especially motor vehicle antennas.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, only the inner telescoping element 11 and the outer telescoping element 12 of the telescoping antenna 10 are shown. The inner telescope element 11 has a contact element 13
is fitted over it. This contact element 13 has the shape of an elongated sleeve with a longitudinal slit 14 . Contact element 13 consists of electrically conductive plastic. This contact element 13 is then advantageously manufactured as an injection molded part. The outer telescoping element 12 has a narrowing 15 at its upper end, and the inner telescoping element 11 has a flange-like widening 16 at its lower end. Therefore, the contact element 13 will be
It is held in an inner telescoping element 11.

As shown in FIG. 2, contact element 13
springs up somewhat outwards in the vicinity of the longitudinal slit 14 and comes into resilient contact with the inner wall of the outer telescopic element 12. Advantageously, the contact element 13 not only has good electrical conductivity but also has good and permanent lubricating properties. This lubricating property is advantageously achieved by a graphite-containing plastic.

In the embodiment according to FIGS. 3 and 4,
The sleeve-shaped contact element 20 provided with a slit has an eccentric cross-section such that the area of the longitudinal slit 21 is thicker than the diametrically opposite area. This increases the spring-elastic effect. In addition, wear that may occur in relatively thick areas does not have any effect on the overall strength of the contact element.

In a further embodiment according to FIG. 5, the sleeve-like contact element 25 provided with slits has a plurality of projections 2 which are advantageously evenly distributed over the outer circumference.
6. By means of these projections 26 a reliable contact with the respective outer telescopic element 12 is achieved.

The contact element 30 according to FIG. 6 has the shape of an elongated sleeve, but is not provided with slits. This sleeve-like contact element 30 may be
It is also possible to have a cross-sectional shape as shown in FIG.

The sleeve-shaped contact element 35 according to FIG. 7 consists of a tubular member 36. At one end 37, this tubular member 36 has at least one notch 38 extending in the longitudinal direction and widens outwardly in a conical manner. The contact element 35 is thereby somewhat spring-elastic in the region 39, with which it is possible to achieve a good contact formation and damping effect as described above for the telescopic element of a telescopic antenna. .

[Brief explanation of the drawing]

1 is a longitudinal section through two telescope elements shown cut away with contact elements; FIG.

FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1;

FIG. 3 shows a cross-sectional view of an eccentrically configured contact element;

4 is a cross-sectional view of a telescoping antenna with the contact element of FIG. 3; FIG.

FIG. 5 shows a cross-sectional view of a contact element with a longitudinal slit and an external convexity;

FIG. 6 shows a cross-sectional view of a contact element without slits;

FIG. 7 shows a longitudinal section through a contact element which is provided with a slit only at one end and is slightly enlarged;

[Explanation of symbols]

10 Telescopic antenna, 11, 12
Telescope element, 13 Contact element, 1
4 vertical slit, 15 narrow part,
16 enlarged portion, 20 contact element,
21 vertical slit, 25 contact element,
26 convex portion, 30 contact element, 35
contact element, 36 tubular member, 37 end, 38 notch, 39 range

Claims (10)

[Claims] 1. A telescoping antenna comprising a plurality of telescoping elements, each two of which are mechanically and mechanically connected to each other via a spring-elastic contact element. In the electrically coupled and connected type, the contact element (13)
A telescopic antenna characterized in that the antenna is made of conductive plastic. 2. Telescoping antenna according to claim 1, characterized in that the contact element (13) has the shape of an elongated sleeve. Claim 3: The contact element (13) has a vertical slit (14
) The telescopic antenna according to claim 1 or 2, characterized in that it has a. 4. Telescoping antenna according to claim 1, characterized in that the contact element (13) is an injection-molded plastic part. 5. Telescoping antenna according to claim 1, characterized in that the contact element (20) has an eccentric cross section between the inner wall and the outer wall. . 6. Telescopic antenna according to claim 1, characterized in that the contact element (25) has convex portions (26) distributed around the outer periphery. . 7. The contact element (35) has one end (37
4. The telescoping antenna according to claim 1, wherein the telescopic antenna is conically widened at . 8. The contact element (35) has one end (37
8. Telescoping antenna according to claim 7, characterized in that it has a notch (38) extending in the longitudinal direction of the contact element (35) in ). 9. Telescoping antenna according to claim 1, characterized in that the plastic for the contact element has sliding properties due to the addition of a slipping substance. 10. The telescopic antenna according to claim 9, wherein the slippery substance is graphite.