JPH048653Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotary antenna arm support device for a television radio wave receiving antenna.

[Conventional technology]

In order to best receive television radio waves indoors, an indoor antenna with an antenna arm rotatably attached to a support has been proposed. For example, as shown in FIG.
5 and a nut 56 to be rotatably attached to the support portion 52. In the figure, 57 is a UHF element, and 58 is a UHF element.
It is a VHF element, and in this case, the height position of the UHF element 57 is adjusted by the antenna arm 53. However, the element height position that I had chosen was antenna arm 5.
It would be a problem if it changed when you let go of 3, so
As shown in FIG. Also around the bolt holes 62 on the side surface, locking projections 60 of the support portion 52, locking grooves 63 that engage and disengage from the locking grooves 61, and locking projections 64 are formed alternately.

[The problem that the idea aims to solve]

When attaching the antenna arm 53 to the support part 52, spread the bifurcated part 54 and insert it into the support part 52 so that the locking protrusions 60 and 64 do not interfere with each other.
Since the bolt holes 59 and 62 of both are aligned and then the locking protrusion and the locking groove of the other side are fitted, assembly is troublesome and time consuming, which is not preferable. Further, since the locking protrusions are engaged with each other, the antenna arm 53 can be adjusted in stages, and there may be cases where the antenna arm cannot be set at a desired elevation angle. In addition, when the antenna arm 53 is rotated, the locking protrusions collide with each other, producing noise, and the bifurcated portion 54 repeatedly widens and pinches, resulting in a short service life of the antenna arm.

The present invention has been developed in view of the above points, and is a rotary antenna arm support device that allows easy assembly of the antenna arm to the support and fixation of the elevation angle, and also allows stepless and quiet setting of the elevation angle of the antenna arm. The purpose is to provide.

[Means to solve the problem]

In order to achieve this purpose, the rotary antenna arm support device according to the present invention removably engages both outer surfaces of the support and both inner surfaces of the bifurcated portion of the antenna arm using an engaging protrusion and an engaging groove. and in which the antenna arm is rotatably attached to the support using bolts and nuts, both outer surfaces of the support and both inner surfaces of the bifurcated part of the antenna arm are aligned with the bolt hole axis except for a predetermined rotation angle range. Vertical plane and no,
In a predetermined rotation angle range, one of the support body and the antenna arm is a protruding slope whose circumferential direction is sloped, and the other is a concave slope that engages with the protruding slope.

A spring member may be interposed between the nut screwed into the bolt and the outer surface of the bifurcated portion of the antenna arm.

[Effect]

The antenna arm is assembled by fitting the recessed slopes or protruding slopes on both inner surfaces of the bifurcated portion into the protruding slopes or recessed slopes of the support, and when the inner surfaces of the bifurcated portion are in full contact with both outer surfaces of the support, tighten the bolts and nuts. Attach to a support. Now, if the antenna arm is rotated in the direction in which the locking steps of the protrusion slope and the recess slope are separated from each other, the slope of the bifurcated part will ride on the slope of the support body, opening the bifurcated part, and the elastic force will cause it to move against the slope. A frictional force is generated. When the antenna arm is rotated to a desired elevation angle by overcoming this frictional force, the antenna arm is fixed to the support with bolts and nuts.

The elevation angle of the antenna arm is set within the range where the antenna arm and the slopes of the support body are in contact with each other, so the elevation angle can be selected steplessly and no noise is emitted. When fixing the antenna arm at the desired elevation angle, Even if you release your hand from the antenna arm, the antenna arm will not rotate due to the frictional force generated on the slope. Also, when the antenna arm rotates in one direction, the two forks will either widen or become narrower, so unless the direction of rotation is changed frequently, the two forks will widen and become narrower while the antenna arm is being operated. Never repeat.

〔Example〕

Embodiments of the present invention will be described based on the drawings. In Figures 1 to 3, a synthetic resin stand 1
The outer surface 3 of the semicylindrical support portion 2 protruding upward;
3, the axis of the bolt hole 4 horizontally installed is a vertical plane 5 except for a predetermined rotation angle range on one side of the lower half, and in the predetermined rotation angle range, the circumferential direction is sloped and the radial direction is The heights are approximately equal or have slopes in both the circumferential and radial directions, and the bolt holes 4
A protruding slope 6 having a locking step 6b is formed on a perpendicular line extending downward from the lower end of the opening end. However,
The slope of the protruding slope 6 is determined so that the frictional force on the slope generated when the recessed slope 12 of the bifurcated portion 9 rides on the protruding slope overcomes the weight of the antenna arm 7.

On the other hand, the antenna arm 7 made of synthetic resin has a UHF element installed horizontally at its tip, and has a bifurcated part 9 with a bolt hole 8 at its base.
, flat surfaces 11, 11 that can slide on the vertical planes 5, 5 of the support part 2, and corresponding to the protruding slopes 6, 6 of the support part 2 when the antenna arm 7 is vertically taken with the forked part 9 facing down. A recessed slope 12 that is in full contact with the protruding slope 6 is formed at the position where the projection slope 6 is formed. When attaching this antenna arm 7 to the support part 2, the recess slope 1
The slopes 12a, 12a of 2 and 12 are the protruding slopes 6, 6
The spring washer 17 was fitted onto the slopes 6a, 6a of the concave portion so that the locking steps 12b, 12b of the recess slopes 12, 12 were in full contact with the locking steps 6b, 6b of the protruding slopes 6, 6, respectively. By inserting the bolts 13 into the bolt holes 8 and 4, inserting the coil spring 14 therein, and tightening the seat nut 15, the antenna arm 7 will be perpendicular to the support part 2, as shown in FIGS. 4 and 5. At the same time, the inner surface 10 of the bifurcated portion 9,
10 and the entire outer surfaces 3, 3 of the support portion 2 are in close contact with each other.

Now, when the antenna arm 7 is rotated counterclockwise from the state shown in FIG. 4, the slope 6a of the protrusion slope 6
The contact surface (indicated by crossed diagonal lines) of the recess slope 12 and the slope 12a decreases (FIG. 6). In this state, the slope 12a of the concave slope 12 climbs up the slope 6a of the protrusion slope 6, so the bifurcated portion 9 opens, and the bifurcated portion 9 opens.
Frictional force is generated on the slopes 6a and 12a due to the elastic force generated in the curve. The antenna arm 7 is rotated to overcome this frictional force to adjust the elevation angle, and the antenna arm 7 is fixed to the support portion 2 at a desired elevation angle position. In this fixing operation, the antenna arm 7 does not rotate due to the frictional force even if the hand is removed from the antenna arm 7, so that it is easy to fix the antenna arm to the support at a desired elevation angle. Further, in this case, although the bifurcated portion 9 is open on both sides as shown in FIG. 7, the seat nut 15 can be fastened stably because the coil spring 14 is inserted.

In addition, when the surface contact between the slopes of the protrusion slope 6 and the slope of the recess 12 is completed (FIG. 8), the plane 11 of the bifurcated portion 9
Since the antenna arm 7 is in line contact with the locking stepped portion 6b of the support portion 2, the antenna arm 7 may rotate under its own weight. Therefore, the antenna arm elevation angle adjustment range is a range in which the slope 12a of the recess slope 12 and the slope 6a of the protrusion slope 6 come into surface contact.

Furthermore, as the spring 14 interposed between one outer surface 16 of the bifurcated portion 9 and the seat nut 15, a plate spring, a spring washer, or the like may be used in addition to a coil spring.

[Effect of idea]

Since the present invention is configured as described above, it produces the following effects.

On the rotating and sliding surfaces of the support body and the antenna arm, a recessed slope or a protruding slope is formed on a part of the flat surface that completely contacts the protruding slope or recessed slope of the other side, so that the elevation angle of the antenna arm can be adjusted steplessly. , no noise is produced during elevation adjustment. Moreover, the antenna arm can be inserted into the support without opening its bifurcated parts, making it easy to attach it to the support.Also, the antenna arm does not rotate even if you release your hand within its elevation angle adjustment range. The work of fixing to a support body at a desired elevation angle can be easily performed.

By interposing a spring member between the nut screwed onto the bolt and the outer surface of the fork part of the antenna arm, the nut can be fastened stably even if the fork part is elastically deformed.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the assembly of the embodiment of the present invention, Fig. 2 is a view in the direction of arrow A in Fig. 1, Fig. 3 is a view in the direction of arrow B in Fig. 1, and Figs. 4 is a front view of the antenna arm that takes the maximum elevation angle, FIG. 5 is a right side view with the same part cut away, and FIG. 6 is a front view of the antenna arm that takes an intermediate elevation angle. 7 is a right side view with the same part cut away, FIG. 8 is a front view of the antenna arm that takes the lowest elevation angle, FIG. 9 is an illustrative view of an indoor antenna, and FIG. 10 is an explanatory diagram of the assembly of a conventional product. 2... Support body, 3... Outer surface, 5, 11... Plane, 6... Protruding slope, 7... Antenna arm, 1
0... Inner surface, 12... Recess slope, 13... Bolt, 14... Spring member, 15... Nut, 16...
...Outer surface of the bifurcated part.

Claims (1)

[Claims for Utility Model Registration] 1. Both outer surfaces 3, 3 of the support body 2 and both inner surfaces 10, 10 of the bifurcated portion of the antenna arm 7 are removably engaged with each other through an engaging protrusion and an engaging groove, and In the structure in which the antenna arm 7 is rotatably attached to the support body 2 with bolts 13 and nuts 15, both outer surfaces 3, 3 of the support body 2 and both inner surfaces 10, 10 of the bifurcated portion of the antenna arm 7 are fixed at predetermined positions. A plane perpendicular to the bolt hole axis except for the rotation angle range 5, 5,
11, 11, and in a predetermined rotation angle range, one of the support body 2 and the antenna arm 7 is a protruding slope 6 whose circumferential direction is sloped, and the other is a concave slope 12 that engages with the protruding slope 6. A rotary antenna arm support device featuring: 2. The rotary antenna arm support device according to claim 1, wherein a spring member 14 is interposed between the nut 15 screwed onto the bolt 13 and the outer surface 16 of the bifurcated portion of the antenna arm 7.