JPS6349928Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slidable inner and outer tube device in a multi-stage telescopic antenna device, and more particularly to an inner and outer tube device suitable for preventing sliding and rotational performance from deteriorating over time.

Conventionally, the lower end of the antenna element, which can be expanded and contracted in multiple stages,
The antenna element is pivoted to the tip of a base metal fitting that is housed in the guide pipe so as to be freely protrusive and retractable in the axial direction and is rotatably supported relative to the guide pipe, so that the antenna element can be tilted and rotated, and the directionality of the antenna can be adjusted after being pulled out from the guide pipe. In addition to making it possible to define
2. Description of the Related Art Multi-stage telescoping antenna devices are generally known that are capable of holding an antenna element in that state after its directionality has been determined.

By the way, in this type of antenna device, sliding is required to be smooth and light when the base metal is pulled out and the antenna element is extended, and the rotation of the base metal after being pulled out is also required to be smooth. Strong resistance is required for the rotation of the base metal in order to prevent the base metal from rotating due to the weight of the antenna element even if the set on which the antenna device is attached is tilted with the antenna element extended or tilted. . However, none of the conventional devices was fully satisfactory.

Therefore, in some cases, the lower end of the base metal fitting is press-fitted into a press-fitting metal fitting that is divided vertically and horizontally to generate a strong elastic force to obtain a large rotational resistance, and also to generate a smooth and light sliding force. In order to achieve this, it has been proposed that two elastic spring pieces are interposed between the press-fit fitting and the guide pipe. This type of antenna device can provide smooth and light sliding and strong rotation holding force that cannot be obtained with conventional devices.

By the way, as this type of elastic spring piece, the first
As shown in Figure a, the spring piece 1 has a gutter-like shape with a circular arc cross section and a protrusion 1a at the lower end, or as shown in Figure 2 a, the central part of the gutter-like shape with a circular arc cross section curves outward and has a protrusion 2a at the lower end. A spring piece 2 is used, and the protrusions 1a and 2a are press-fitted into the recess 3a of the press-fit fitting 3 to support the spring pieces 1 and 2 at one point on the press-fit fitting 3, and both ends A of the spring piece 1 or the center of the spring piece 2 are The portion B is brought into pressure contact with the guide pipe 4.

In an antenna device having such a spring piece, in order to make effective use of the sliding dimension within the guide pipe, it is preferable to configure the internal sliding portion to be as short as possible. However, when the dimensions of the press-fit fitting are shortened and a spring piece is placed on its outer surface, from a macroscopic perspective, the subtle opening and closing movements of the high-pressure elastic part of the split part of the press-fit fitting directly affects the spring piece, causing the spring to break. This causes fluctuations in the sliding force between the piece and the guide pipe, and even though grease is applied to the assembly at the time of assembly, the fluctuation may cause the oil film of the grease to break and cause a seizure phenomenon during sliding.

In addition, since the press-fit fitting is structured so that it cannot rotate relative to the guide pipe, the contact points A and B between the spring pieces 1 and 2 and the guide pipe 4 shown in Figs. 1 and 2 are always the same part. This increases the likelihood that shavings will be generated due to wear and friction of the parts, making it more likely that seizure will occur.

Furthermore, as mentioned above, the spring piece is not in contact with the press-fit metal fitting and the guide pipe over its entire surface, and is supported by the press-fit metal fitting at one point via its protrusion. Therefore, the gap between the press-fit metal fitting and the guide pipe fluctuates in size due to the subtle opening and closing movement of the split part of the press-fit metal fitting. If this gap becomes wider, the spring piece is likely to shift left and right with its protrusion as a fulcrum. This fluctuation makes the sliding friction even more unstable, exacerbating problems such as seizure.

The present invention was developed in view of the current situation, and its purpose is to prevent the spring pieces from shifting to the left or right and from running out of oil, thereby providing stable sliding resistance. It is an object of the present invention to provide a slidable inner and outer tube device such as a telescopic antenna device.

The present invention provides press-fit fittings in the slidable inner and outer tube devices of the above-mentioned known multi-stage telescopic antenna device.
A cylindrical portion is integrally provided following a large-diameter flange at one end, and a vertical groove and a horizontal groove are formed in the cylindrical portion of the press-fit fitting.
At least one pair of recesses are provided on the outer surface of the cylindrical portion, and an axial notch is formed in the peripheral edge of the flange, and an axial slide rib on the inner surface of the guide pipe is engaged with the notch. The friction column of the base metal fitting is press-fitted into the inside of the press-fit fitting from the flange side to prevent the press-fit fitting from rotating relative to the guide pipe, and the gap between the inner surface of the guide pipe and the cylindrical portion of the press-fit fitting is Insert the elastic spring piece into the inner surface of the cylindrical part of the press-fit fitting, and insert the inward protrusion of the oil sump from the outer surface of the elastic spring piece toward the inner surface to the inner surface of the oil sump, which is recessed with approximately the same size and shape as the recess. It is characterized by being fitted with.

The present invention will be explained below based on an embodiment shown in FIGS. 3 and 4.

In the figure, reference numeral 11 denotes a multi-stage expandable and retractable antenna element, and a base end fitting 11a fixed to the base end of the antenna element 11 is pivotally attached to a base metal fitting 13 via a set screw 12, and a cutter of the base metal fitting is attached. It is freely tiltable in the direction of the groove 13a. This base metal fitting 13 is
A distal end portion 13b protrudes upward from a press-fit fitting 14 to be described later and to which the proximal end fitting 11a is pivotally attached;
and a small-diameter rod-shaped friction column 13c that is press-fitted into the shaft to obtain a strong rotational torque.On the outer peripheral surface of the friction column 13c, an engagement groove 16 and an oil groove 17, in which a locking ring 15 to be described later engages, are respectively provided. It is provided.

The press-fit fitting 14 serves as an inner tube of an inner and outer tube device that is slidable relative to each other, and includes a cylindrical portion 14a and an annular collar portion 14b integrally provided at its upper end.
As shown in FIG. 4, this press-fit fitting 14 slides up and down into a guide pipe 18 as an outer tube of an inner-outer tube device with the friction column 13c of the base metal fitting 13 press-fitted therein. Possibly installed. The flange portion 14b is provided with notches 19 at two locations at equal intervals in the circumferential direction, and a cutout portion 19 is provided in the notch portion 19 so as to face the inner surface of the guide pipe 18 and pass through it in the axial direction. A slide rib 20 is fitted to prevent the press-fit fitting 14 from rotating.

This guide pipe 18 is formed by expanding a cylindrical tube with a diameter larger than a specified size using a small-diameter circular hole die and a ribbed plug to form a tube body having a slide rib 20 integrated in the axial direction on the inner surface side, It is formed by cutting out the slide rib 20 at the upper end of this tubular body and providing a constricted part 21. And the aperture part 2
1 prevents the press-fit fitting 14 from coming out of the guide pipe 18.

On the other hand, the cylindrical portion 14a of the press-fit fitting 14 has a vertical groove 22 at a position corresponding to one of the notches 19, and also corresponds to the engagement groove 16 of the friction column 13c press-fitted into the press-fit fitting 14. Horizontal groove 2 at the position where
3 are provided respectively, and the vertically divided grooves 22
This ensures a strong elastic force on the cylindrical portion 14a, and the press-fit fitting 14 of the friction column 13c is secured by the C-shaped synthetic resin locking ring 15 which is snap-fitted into the horizontal groove 23 and the engagement groove 16. There are measures being taken to prevent this from happening.

Further, a rectangular recess 24 and a through hole 25 are provided in the diametrically opposed portions of the cylindrical portion 14a, and elastic spring pieces 26 are respectively provided on the outer surfaces of these. There is.

This elastic spring piece 26 is formed in the shape of a gutter with an arcuate cross section, and a concave oil reservoir 27 is provided in the center thereof by pressing or the like to form a protrusion to be fitted into the concave part 24 inside. Further, below the oil reservoir 27, a projection 28 is formed by press working or the like to be press-fitted into the through hole 25 and fix the elastic spring piece 26 to the outer surface of the cylindrical portion 14a. The depth of the oil reservoir 27 is 0.5 mm when the gap between the members is 0.5 mm and the thickness of the elastic spring piece 26 is about 0.3 mm.
It is enough.

In FIG. 4, reference numeral 29 denotes a guide metal fitting fixed to the lower end of the guide pipe 18 by caulking in order to install the guide pipe 18 in a set (not shown).

When assembling, first, the friction column 13c of the base metal fitting 13 is press-fitted into the press-fitting metal fitting 14, and the two are connected by the locking ring 15. Then, an elastic spring piece 26 is attached to the outer surface side of the cylindrical portion 14a, and the tip portion 1
The base end fitting 11a of the antenna element 11 is pivotally attached to the antenna element 3b via a set screw 12.

Next, these assemblies are inserted into the guide pipe 18 from the lower end side, and then the guide pipe 1
A guide fitting 29 is caulked and fixed to the lower end of 8. Then, the guide pipe 18 is attached to a set (not shown) via this guide fitting 29.

When using, first grasp the tip of the antenna element 11 and remove the antenna element 11 and base metal fitting 13.
The distal end portion 13b of the guide pipe 18 is pulled out.
At this time, the elastic spring piece 26 slides on the inner surface of the guide pipe 18, but the elastic spring piece 26
Press fit fitting 1 at two points with oil reservoir 27 and protrusion 28
4, it is possible to stably fix it without causing any shift fluctuations from side to side. In addition, lubricating oil (usually grease) is supplied from an oil reservoir 27 to the sliding part between the elastic spring piece 26 and the guide pipe 18.
Since oil is constantly supplied, an oil film is uniformly formed between the sliding surfaces, effectively preventing oil from running out. Although the elastic spring piece 26 and the guide pipe 18 are in point or line contact, there is always a uniform oil film between the opening surface of the oil reservoir 27 and the inner peripheral surface of the guide pipe 18 due to the surface tension of the lubricating oil. is formed, a stable sliding force is ensured even if the press-fit fitting 14 expands and contracts.

Next, the antenna element 11 is tilted from its base end, and the base metal fitting 13 is rotated to set the antenna in a predetermined direction. Here press-fit fitting 14
does not rotate due to the engagement between the notch 19 of the flange 14b and the slide rib 20 of the guide pipe 18, so the friction column 13c of the base metal fitting 13 rotates within the press-fit fitting 14. And at this time,
Since the cylindrical portion 14a of the press-fit fitting 14 is provided with a vertical groove 22, a clamping pressure that provides sufficient rotational resistance between the friction column 13c and the friction column 13c is secured, and the friction column 13c is provided between these sliding surfaces. Since sufficient lubricating oil (usually grease) is supplied from the oil groove 17, smooth rotation can be obtained.

In the above embodiment, the oil reservoir 27 and the recess 24 into which it is fitted are described as having a rectangular shape, but there is no restriction on the shape as long as the oil can be uniformly applied to the sliding surface. Further, in the embodiment described above, the recess 24 has a concave shape with a bottom, but it may be in the shape of a hole without a bottom. When using the hole-shaped recess 24 in this way, the oil reservoir 27
By communicating the oil film 17 of the friction column 13c with the oil film 17 of the friction column 13c through a hole or the like, it becomes possible to share the lubricating oil between the two.

In the above embodiment, the present invention is applied to a structure having a spring piece 26 between the press-fit fitting (inner tube) 14 at the base end of the base fitting 13 and the guide pipe (outer tube) 18. The present invention can also be applied to a structure in which a spring is interposed between each unit antenna element (inner and outer tube) of the antenna element 11. Further, the present invention can be applied to sliding inner/outlet tube devices other than multi-stage telescopic antenna devices.

In addition, if the element and the spring piece are extremely thin, a through hole-shaped oil reservoir is provided in place of the dish-shaped oil reservoir 27, and the cylindrical portion 1 corresponding to this oil reservoir is provided.
There is also a method of not providing holes in 4a. In this case, oil can be stored by the thickness (depth) of the through hole.

As is clear from the above description of the embodiments, according to the present invention, an oil reservoir recess is formed in the recess provided on the outer surface of the cylindrical portion of the press-fit fitting, from the outer surface to the inner side of the elastic spring piece. By fitting the inward protrusion obtained by the method and making the dimensions and shape of this protrusion approximate the dimensions and shape of the recess, the spring piece is stably positioned and held on the outer surface of the cylindrical part. In addition, by storing oil in the oil sump recess of the spring piece, the oil can be supplied little by little between the spring piece and the inner surface of the guide pipe to provide sufficient lubrication. It is possible to maintain smooth sliding in a well-lubricated state. In addition, in the present invention, since the press-fit fitting has vertical grooves and horizontal grooves in its cylindrical portion, it can be elastically deformed, and the elastic spring piece can be inserted between the base metal fitting and the guide pipe. It is easy to adapt to the optimal shape for retention, and the notch on the flange of the press-fit fitting engages with the slide rib on the inner surface of the guide pipe, allowing smooth axial movement without rotation. It can be caused to slide.

[Brief explanation of drawings]

FIG. 1a is a perspective view showing an example of a spring piece used in a conventional device, FIG.
3 is a perspective view showing another example of a spring piece used in a conventional device, FIG. FIG. 4 is a sectional view showing the assembled state of FIG. 3. 11... Antenna element, 13... Base metal fitting, 13
c...Friction column, 14...Press-fit fitting (inner pipe), 14
a... Cylinder part, 18... Guide pipe (outer pipe), 2
2...Vertical groove, 24...Recess, 25...Through hole, 26...Elastic spring piece, 27...Recess (oil reservoir), 28...Protrusion.

Claims (1)

[Scope of utility model registration request] The friction pillar of the base metal fitting that supports the base end of the antenna element is press-fitted into the inside of the cylindrical press-fitting fitting inserted into the guide pipe so as to be slidable and secured, and the inner surface of the guide pipe and the outer surface of the press-fitting fitting are pressed. In a slidable inner and outer tube device of a multi-stage telescopic antenna device in which an elastic spring piece with an arcuate cross section is inserted between the press-fit fitting 1 and
4 to the large diameter flange 14b at one end and then to the cylindrical part 14a.
In addition to being formed by an integrally provided
A vertical groove 22 and a horizontal groove 23 are formed in the cylindrical portion 14a of the press-fit fitting 14, and at least one pair of recesses 24 are provided on the outer surface of the cylindrical portion, while an axial notch is formed on the periphery of the collar portion. 19 and an axial sliding rib 20 on the inner surface of the guide pipe 18.
is engaged with the notch 19 to prevent rotation of the press-fit fitting with respect to the guide pipe, and the press-fit fitting 14
The friction column 13c of the base metal fitting 13 is press-fitted into the inside of the base metal fitting 13 from the side of the flange 14b, and the elastic spring piece 26 is inserted into the gap between the inner surface of the guide pipe 18 and the cylindrical portion 14a of the press-fitting fitting. The inward protrusion of the oil reservoir 27, which is recessed in the recess in substantially the same size and shape as it goes from the outer surface to the inner surface of the elastic spring piece, is engaged with the recess 24 on the inner surface of the cylindrical portion of the press-fit fitting. Features an inner and outer tube device.