JPH0756488Y2 - Arm cap for antenna - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna arm cap, which facilitates the manufacture of a cap that is attached to a cut end of an antenna arm formed of a pipe material to close the opening and that has a hole inside the arm. The purpose of the present invention is to form a cap mounted state that responds to dimensional errors and is stable and has a good appearance in any state.

[0002]

2. Description of the Related Art It is common to use a pipe material in order to reduce the weight and cost of an antenna arm. The antenna arm formed of this pipe has an opening formed at its cut end, so that rainwater or other It has been widely practiced to apply a cap integrally formed with a cap portion to one end of a cylindrical body in order to prevent the entry of the air and prevent the generation of wind noise when the wind blows.

However, there is some error in the inner hole diameter of the antenna arm provided with such a cap, and if the outer diameter of the insertion portion of the cap inserted into the inner hole of the arm having such an error is constant, it is inserted. It is not possible to do so, or there is a disadvantage that a stable engagement with the inner hole of the arm cannot be obtained and the arm is dropped and lost.

Therefore, engaging ridges are formed along the axial direction at the arm inner hole insertion portion of the cap, or in fact 3-
As disclosed in Japanese Patent No. 26644, ring-shaped projections having a small tip end are formed in multiple stages on the outer surface of the inner-hole insertion portion of the cap, and when the cap is inserted, the ring-shaped projections are formed in the arm inner-hole surface. It has been announced that it will be locked in multiple stages.

[0005]

However, in the prior art as described above, in the case where the engaging protrusion is formed axially in the inner hole insertion portion of the cap, if the engaging protrusion is high, the arm inner hole is formed. When inserted, the ridge is scraped off at the end of the inner hole, and the scraped ridge is exposed on the outer surface of the arm. The arm cap is sandwiched between the caps and the mounting of the arm cap is not stable, and there are disadvantages such that the cap floats up and is easily removed.

Further, in the above-mentioned Japanese Utility Model Publication No. 3-26644, since the projections in the circumferential direction of the insertion portion of the cap, which are thin, are bent and engaged, they are attached as described above. Even if there is no disadvantage, the mold for manufacturing becomes complicated and expensive, the manufacturing man-hours are also increased and it is expensive, and even if it is pushed into the collar of the cap at the time of mounting, if this pushing pressure is released, the above-mentioned As described above, the ring-shaped ridges whose tip ends are curved backward in the pushing direction act to return the ridges to the engaging positions of the ridges of the ridges in the arm inner hole to restore the cap collar and the arm edge. There is a defect that it is easy to form a gap between them.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the problems in the prior art as described above, and it is easy and inexpensive to manufacture, and always has a good appearance. I succeeded in getting clothes,
It is as follows.

In an arm cap integrally formed with an insertion portion to be inserted into the arm inner hole and a cap portion at one end side of the insertion portion, a plurality of engaging protrusions extending along the axial direction are formed on the peripheral surface of the insertion portion. An arm cap for an antenna, characterized in that a groove is formed on each of the inner surfaces of the caps on the base end side of the engaging projections.

[0009]

In the arm cap integrally formed with the insertion portion to be inserted into the arm inner hole and the crown portion on one end side of the insertion portion, a plurality of engaging protrusions extending along the axial direction are formed on the peripheral surface of the insertion portion. By disposing the cap, the cap can be smoothly inserted into the inner hole of the arm, and the inner edge of the inner hole of the arm can be scraped off for proper insertion and fixing.

As described above, since the grooves are formed on the inner surface of the crown portion on the base end side of the engaging projections arranged in the arm inner hole insertion portion of the cap, the projections scraped off at the time of insertion as described above. The groove waste is received in the groove so that the protrusion waste is not exposed outside the cap. Moreover, since the projection waste is received in the groove, the arm edge and the cap of the cap are closely attached, and the cap can be mounted stably and in a good appearance.

Since the engaging ridges as described above are along the axial direction, a simple mold that can be moved and operated in the axial direction of the cap will suffice as the mold for manufacturing. The work can be simplified and the cost can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention as described above will be described with reference to the accompanying drawings.
In the case of a cap applied to an elliptical or oval arm, the oval or oval inner hole insertion portion 1 has a cap 2 formed on one end side, and the cap 2 has a brim shape. A substantially uniform protrusion relationship is formed in the entire circumferential direction of the insertion portion 1. As shown in the drawing, the insertion portion 1 forms the hollow portion 5.

In addition, in the illustrated case, four engaging projections 3 are arranged at equal intervals on the peripheral surface of the above-mentioned insertion portion 1,
These engaging ridges 3 are formed with the crown portion 2 side as a base portion and the tip portions are appropriately shallowly formed, but a groove portion 4 is formed on the inner surface of the crown portion 2 on the base end side.

FIGS. 3 and 4 show another embodiment according to the present invention. As is apparent from FIG. 4, both the insertion portion 1 and the crown portion 2 have a perfect circular shape, and the other engaging protrusions. The structural relationship between the strip 3 and the groove portion 4 is the same as that shown in FIGS.

5 and 6 show another embodiment according to the present invention. That is, in this embodiment, the insertion portion 1 and the crown portion 2 are both formed in a rectangular shape and are applied to the cut end portion of the arm formed by the rectangular pipe, and the engaging protrusion 3 and the groove portion 4 are used. It is as shown in the drawing that the constitutional relation of is the same as that of FIGS.

That is, in any of these embodiments, the plurality of engaging projections 3 provided appropriately allow the dimensional error of the arm inner hole when inserted into the inner hole of the arm, At least the engaging projection 3 forms a close engagement state, and when the projection 3 is scraped off by the hole edge when inserted into the inner hole of the arm, the shavings are received in the groove 4 and the cap 2 The bottom surface of the arm is prevented from being sandwiched between the arm and the edge of the arm or protruding to the outside, so that a stable and well-fitted mounting relationship can be formed and maintained.

The usage state of the cap according to the present invention as described above is as shown in FIGS. 7 and 8. As shown in FIG. 7, the base end portion of the primary radiator support arm 11 of the parabolic antenna 10 and As shown in FIG. 8, caps 6 are attached to both ends of the arm 13 of the television antenna 12, respectively.
As described above, it prevents the intrusion of rain and dew and the generation of wind noise.

[0018]

According to the present invention as described above, the end of the antenna arm of this kind formed of a pipe material can be stably and accurately engaged, and its manufacture is easy and low. This is a device which has a large effect industrially because it can be provided at a low cost and can form a good-looking antenna arm.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment according to the present invention.

FIG. 2 is a bottom view of what is shown in FIG.

FIG. 3 is a partially cutaway side view of another embodiment according to the present invention.

FIG. 4 is a bottom view of what is shown in FIG.

FIG. 5 is a partially cutaway side view of still another embodiment according to the present invention.

FIG. 6 is a bottom view of what is shown in FIG.

FIG. 7 is a side view showing an example of using the cap according to the present invention.

FIG. 8 is a perspective view showing another example of its use.

[Explanation of symbols]

 1 Inner hole insertion part 2 Crown cover part 3 Engagement protrusion 4 Groove part 5 Hollow part 6 Cap (product of the present invention) 10 Parabolic antenna 11 Its arm 12 Television antenna 13 Its arm

Claims (1)

[Scope of utility model registration request] 1. An arm cap integrally formed with an insertion portion to be inserted into an arm inner hole and a cap portion at one end side of the insertion portion, wherein a plurality of axial engagement projections are provided on a peripheral surface of the insertion portion. An arm cap for an antenna, characterized in that grooves are formed on the inner surface of the cap portion on the base end side of the engaging projections.