JPH0681107U - Rod antenna - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a telescopic rod antenna with which the small diameter rod 10 can be easily replaced. [Structure] Conductive plates 16 and 16 are provided at the base end of the small-diameter rod 10 so as to be engaged along the outer peripheral wall. This conductive plate 1
The small-diameter rod 10 in which 6 and 16 are arranged is replaced by the large-diameter rod 1.
8 is slidably fitted and inserted. The large-diameter rod 18 cuts and raises the tongue piece 20 with the free end projecting outward facing the insertion direction of the small-diameter rod 10. Further, the cap 22 fitted to the large-diameter rod 18 allows the small-diameter rod 10 to penetrate, but does not allow the conductive plates 16 and 16 to penetrate, and the engaging window into which the tongue piece 20 is inserted and engaged. 26 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a retractable rod antenna that allows a small diameter rod to be easily replaced.

[0002]

[Prior art]

 A telescopic rod antenna is widely used as an on-vehicle antenna. The rod antenna may be washed by an automatic car washer or the like while it is still extended, or it may be damaged by mischief or the like. Therefore, it is desirable that the structure be such that a damaged rod antenna can be replaced.

[0003]

[Problems to be solved by the device]

 However, in the conventional replacement of the rod antenna, it is necessary to remove the entire rod antenna from the vehicle body or disassemble the whole body, and the replacement work is complicated.

The present invention has been made in view of such circumstances of the prior art, and an object thereof is to provide a rod antenna in which a small-diameter rod of the rod antenna can be easily replaced from the outside.

[0005]

[Means for Solving the Problems]

 In order to achieve such an object, the rod antenna of the present invention has a small hole formed at one end of a small diameter rod, and a conductive plate having a protrusion inserted into and engaged with the small hole is provided on the outer periphery of the small diameter rod. The small-diameter rod, which is arranged alongside the wall, is fitted slidably into the large-diameter rod, and the conductive plate is arranged on the large-diameter rod. The tongue piece is cut and raised so that the end faces the insertion direction of the small diameter rod, and the small diameter rod is allowed to penetrate through the fitting side end of the large diameter rod, but the conductive plate is not allowed to penetrate. A cap having a tongue is fitted into the cap, and an engaging window is formed in which the tongue piece is inserted and engaged.

Further, a bent portion for cutting and raising the tongue piece from the large-diameter rod may be formed in a linear shape.

[0007]

[Work]

 When the tongue piece cut and raised on the large-diameter rod engages with the engagement window of the cap, the conductive plate provided on the small-diameter rod is prevented from coming off by the pinching part of the cap. It cannot be pulled out from the large diameter rod. Then, if the tongue piece is pressed inward to release the engagement with the engaging window, the small diameter rod can be pulled out together with the cap from the large diameter rod.

Further, if the bent portion for cutting the tongue piece from the large-diameter rod is formed in a straight line, even if the tongue piece is pressed inward, bending stress acts evenly on the bent portion and elastically deforms. , Elasticity is not lost by plastic deformation.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of an essential part of an embodiment of a rod antenna of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is an enlarged perspective view of a tongue piece.

In FIGS. 1 to 3, small holes 12, 12 are formed in the base end portion of the small diameter rod 10. Then, conductive plates 16 and 16 having arcuate cross-sections provided with projections 14 and 14 which are inserted into and engaged with these small holes 12 and 12 are arranged along the outer peripheral wall of the base end portion of the small diameter rod 10. It The conductive plates 16 and 16 are engaged with the small-diameter rod 10 by the projections 14 and 14 and are relatively immovable in the axial direction. The conductive plates 16 and 16 are curved so as to slightly swell in the radial direction of the small-diameter rod 10 and have elasticity in the radial direction. The electrical connection of the large diameter rod 18 is ensured.

Then, the small-diameter rod 10 provided with the conductive plates 16 and 16 is fitted and inserted into the large-diameter rod 18. A tongue piece 20 is cut and raised at an end portion of the large-diameter rod 18 on the fitting side so that a free end thereof projects outward. The tongue piece 20 is formed so that its free end faces in the insertion direction of the small diameter rod 10. Further, the cap 22 is fitted to the fitting-side end of the large-diameter rod 18. The cap 22 is provided with a squeezing portion 24 that allows the small-diameter rod 10 to penetrate, but does not allow the conductive plates 16 and 16 to penetrate, and faces the tongue piece 20 of the large-diameter rod 18. An engagement window 26 is formed in which the tongue piece 20 can be inserted and engaged.

Further, the bent portion 20a where the tongue piece 20 is cut and raised from the large-diameter rod 18 is formed in a linear shape by a press or the like.

In assembling the rod antenna of the present invention having the above structure, the small diameter rod 10 is first penetrated through the cap 22, and then the projections 14, 14 are inserted into the small holes 12, 12, so that the conductive plates 16, 16 are reduced in diameter. It is arranged on the rod 10. Then, the small diameter rod 10 provided with the conductive plates 16 and 16 is fitted and inserted into the large diameter rod 18. Further, the cap 22 is fitted to the large-diameter rod 18 so that the engaging window 26 faces the tongue piece 20. When the engagement window 26 faces the tongue piece 20, the free end of the tongue piece 20 projects into the engagement window 26 due to the elasticity of the tongue piece 20.

In this structure, when the small-diameter rod 10 is pulled out from the large-diameter rod 18, the conductive plates 16 and 16 are prevented from moving at the pinching portion 24 of the cap 22, and the cap 22 is tongue-shaped. The movement is blocked by. As a result, the small diameter rod 10 cannot be pulled out from the large diameter rod 18.

When the small-diameter rod 10 is inserted into the large-diameter rod 18, the conductive plates 16, 16 arranged on the small-diameter rod 10 are slid while being in contact with the inner peripheral wall of the large-diameter rod 18. It Therefore, the small-diameter rod 10 can extend and contract with respect to the large-diameter rod 18.

Further, by pressing the tongue piece 20 inward to release the engagement with the engagement window 26, the cap 22 can be pulled out from the large-diameter rod 18. As a result, the small diameter rod 10 can be easily pulled out from the large diameter rod 18.

Therefore, the small-diameter rod 10 cannot be pulled out from the large-diameter rod 18 unless the tongue piece 20 is pushed inward, but it can be easily pulled out by only pushing the tongue piece 20 inward. Easy to replace.

By the way, if the tongue piece 20 is simply raised from the cylindrical large-diameter rod 18, the bent portion has an arc shape, and the bending stress is evenly applied to the bent portion by the inward pressing of the tongue piece 20. However, the elasticity that causes plastic deformation to project outward is likely to be lost. Therefore, as shown in FIG. 3, in the rod antenna of the present invention, since the bent portion 20a of the tongue piece 20 has a linear shape, the bending stress is uniformly applied to the bent portion 20a when pressed inward. Due to the action of, the plastic deformation hardly occurs and the elasticity is not lost. Then, even if the tongue piece 20 is repeatedly pressed inward, the small diameter rod 10 can be repeatedly replaced by elastically protruding outwardly.

The large-diameter rod 18 and the small-diameter rod 10 in the above embodiment can be used for most of the rod antenna if they are applied to the rod of the maximum diameter at the antenna base end portion of the rod antenna and the rod of the next stage. Can be exchanged. And, of course, as long as it is a multi-stage rod antenna, it may be applied to any stage.

[0020]

[Effect of device]

 As described above, since the rod antenna of the present invention is constructed, it has the following special effects.

The small diameter rod is prevented from being pulled out by the tongue piece cut and raised in the large diameter rod, and the small diameter rod can be easily pulled out by pressing the tongue piece inward, so that the small diameter rod can be replaced. It's extremely easy. Further, the structure of the present invention is relatively simple in structure, can be easily reduced in diameter, and can be manufactured at low cost, which is suitable for mass production.

Further, if the bent portion of the tongue piece is formed in a linear shape, the bending stress is applied evenly to the bent portion by the inward pressing, so that the small-diameter rod is wound without losing elasticity. It can be returned and converted.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an embodiment of a rod antenna of the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is an enlarged perspective view of a tongue piece.

[Explanation of symbols]

 10 Small Diameter Rod 12 Small Hole 14 Protrusion 16 Conductive Plate 18 Large Diameter Rod 20 Tongue 20a Bent Part 22 Cap 24 Clamping Part 26 Engagement Window

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nakajo Ikuzo 1112 Shinnohara, Tomioka City, Gunma Yokoo Tomioka Factory

Claims (2)

[Scope of utility model registration request] 1. A small hole is bored at one end of a small diameter rod, and a conductive plate having a projection inserted into and engaged with the small hole is arranged along the outer peripheral wall of the small diameter rod. The small-diameter rod in which is mounted is slidably fitted and inserted into the large-diameter rod, and the free end projecting outward at the fitting-side end of the large-diameter rod faces the insertion direction of the small-diameter rod. The tongue piece is cut and raised, and a cap having a pinching portion that allows the small-diameter rod to penetrate but does not allow the conductive plate to penetrate is fitted to the fitting-side end portion of the large-diameter rod. A rod antenna characterized in that an engaging window for inserting and engaging with is formed. 2. The rod antenna according to claim 1, wherein a bent portion for cutting and raising the tongue piece from the large-diameter rod is formed in a linear shape.