JP3890938B2 - Antenna mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antenna mounting structure in, for example, a radio apparatus for stationary installation, and more particularly to an antenna mounting structure that does not change the directivity direction semipermanently once the directivity direction of the antenna is adjusted.
[0002]
[Prior art]
For example, in an unmanned gas usage monitoring system, there are a large number of wireless transmission / reception slave units that detect the usage amount of gas for each house and transmit the detected usage amount of gas individually to the wireless transmission / reception master unit. Is provided. These wireless transmission / reception base units and slave units are provided with an antenna that is rotatably supported by the device casing, and the antennas are rotated and adjusted so that the antennas are directed toward each other in order to improve the sensitivity of the antenna. Thus, data is surely transmitted from these stationary radio transmission / reception slave units to the radio transmission / reception master unit.
[0003]
[Problems to be solved by the invention]
However, in the conventional antenna mounting structure described above, the antenna is simply mounted on the case of the wireless transmission parent device and the child device so that the antenna can be adjusted once. Depending on the situation, the pointing direction may be changed intentionally or accidentally. When such a situation occurs, since it is an unmanned monitoring system, the antenna directivity direction remains changed, and there is a problem that the sensitivity of the antenna decreases.
[0004]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an antenna mounting structure in which the pointing direction of the antenna once adjusted is not changed. is there.
[0005]
[Means for Solving the Problems]
In order to achieve this object, according to the present invention, the end of the rotation shaft provided at the base portion of the antenna is supported and fixed in the device housing, so that the rotation shaft is supported rotatably about the axis. The antenna mounting structure has an engagement member that is pivotally attached to the rotation shaft, and the rotation is restricted by fitting the engagement member into a fitting recess that is detachably engageable with the engagement member. An anti-rotation member held in such a manner that the engagement member can be freely engaged with and disengaged from the anti-rotation member in a rotational direction of the rotation shaft, and the engagement member is disc-shaped. The outer peripheral portion is provided with a number of engaging projections formed at equal intervals in the circumferential direction, the rotation preventing member is provided with a circular hollow portion, and the engaging projection is provided on the outer periphery of the hollow portion. A number of engaging recesses to be engaged are provided, and the anti-rotation is provided by a cover attached to the device housing. Is obtained by regulating the falling off from the fitting recess of the device housing member.
Therefore, when the direction of the antenna is adjusted, the rotation of the rotation shaft is restricted by engaging the engagement protrusion of the engagement member with the engagement recess of the rotation preventing member. Next, the rotation of the rotation prevention member is restricted by the apparatus housing by fitting the rotation prevention member into the fitting recess of the apparatus housing, and the fall of the rotation prevention member from the enclosure is restricted by attaching a cover to the apparatus housing. Is done.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a base station for wireless transmission / reception employing the antenna mounting structure according to the present invention, and FIG. 2 is a front view of the base station for wireless transmission / reception. FIG. 3 is a perspective view of the main part showing the antenna mounting structure according to the present invention, FIG. 4 shows the same locking member, FIG. 3 (a) is a front view, and FIG. 3 (b) is a side view. FIG. 5 is a side view of the main part, in which FIG. 5A shows a state where the cover is removed, and FIG. 5B shows a state where the cover is attached. 6 is a cross-sectional view taken along line VI-VI in FIG. 1. FIG. 6A shows a state where the cover is removed, and FIG. 6B shows a state where the cover is attached.
[0009]
As shown in FIG. 1, FIG. 2, and FIG. 6, what is denoted by reference numeral 1 as a whole is a base unit for wireless transmission / reception, which is a flat and box-shaped device housing 2 that opens upward, and the opening of this device housing 2 And a flat cover 3 that is attached to the apparatus housing 2 so as to cover the bottom and open downward.
[0010]
As shown in FIG. 3, a pair of fitting recesses 21, 21 are provided on the outer surfaces of both sides of the device housing 2, and these fitting recesses 21, 21 are formed in a square shape in a side view. As shown in FIG. 6, support holes 22 and 22 (one support hole 22 is not shown) are drilled in the center of the fitting recesses 21 and 21, and the upper end of the device housing 2 extends over the entire circumference. A slit-like recess 23 is provided. A protrusion 24 having a relatively low height is erected on the bottom of the apparatus housing 2 corresponding to the support hole 22. The protrusion 24 comes into contact with the protrusion 24 and is higher than the protrusion 24. Is erected.
[0011]
As shown in FIG. 3 and FIG. 6, both side portions and the back surface portion of the surrounding wall portion of the cover 3 are formed in a skirt shape, and are formed so as to expand outward from a substantially central portion. U-shaped grooves 31 and 31 (one U-shaped groove 31 is not shown) having a width larger than the diameter of a rotating shaft 41 described later and opened below are formed on both sides of the enclosure wall portion of the cover 3. A tongue piece 32 is provided on the ceiling of the cover 3 so as to protrude downward over the entire circumference. In addition, a pair of ribs 33, 33 projecting vertically downward are provided on both side edges of the U-shaped groove 31 inside the cover 3.
[0012]
Reference numerals 4 and 4 denote a pair of antennas. A rotation shaft 41 is provided at the base so as to be orthogonal to the extending direction of the antenna 4, and a flat support is formed at one end of the rotation shaft 41. The pieces 42 are continuously provided, and the rotation shaft 41 is supported by the support pieces 42 so as to be rotatable around the axis. An engaging member 43 is pivotally attached to the rotating shaft 41, and 12 pairs of engaging protrusions 44 are engaged with an outer peripheral portion of the engaging member 43 at an equal angle (30 °) in the circumferential direction. A joint recess 45 is provided.
[0013]
The rotating shaft 41 of the antenna 4 is engaged with the support hole 22 from the outside of the apparatus housing 2, and the support piece 42 is placed on the protrusion 24 by being abutted against the abutting piece 25, and is projected by a screw. 24 is fixed. When the support piece 42 is fixed on the protrusion 24, the rotation shaft 41 is supported by the support piece 42 so as to be rotatable around its axis, and as shown in FIG. Is positioned in the fitting recess 21.
[0014]
Reference numeral 5 denotes a rotation prevention member, which is formed in a square in a front view whose outer shape is slightly smaller than the outer shape of the fitting recess 21 of the apparatus housing 2, and a circular hollow portion 51 is provided in the center portion. On the outer periphery, 12 pairs of engagement recesses 52 and engagement protrusions 53 are provided at equal intervals (30 °) in the circumferential direction. The pitch (30 °) in the circumferential direction between the engagement protrusions 53 is formed to be the same as the pitch in the circumferential direction between the engagement protrusions 44 of the engagement member 43 described above, and the outer shape of the engagement recess 52 is engaged. It is formed slightly larger than the outer shape of the protrusion 44. Further, as shown in FIG. 4A, the distance D between the tips of the opposing engaging projections 53 is formed larger than the diameter of the rotating shaft 41, and the anti-rotation member 5 is axially aligned with the rotating shaft 41. It is inserted through to be movable.
[0015]
In such a configuration, in order to rotate and adjust the directivity direction of the antenna 4, the antenna 4 is gripped and the rotation shaft 41 is rotated to determine the directivity direction of the antenna 4. Next, the rotation prevention member 5 is moved in the direction of arrow A in FIGS. 3 and 6A so that the rotation prevention member 5 is fitted in the fitting recess 21 of the apparatus housing 2. At this time, the engaging projection 44 of the engaging member 43 is engaged with the engaging recess 52 of the rotation preventing member 5 by rotating the rotating shaft 41 in the clockwise and counterclockwise directions by 30 °. Therefore, when the rotation preventing member 5 is fitted in the fitting recess 21 of the apparatus housing 2, the rotation of the rotation preventing member 5 is restricted, and the rotation of the engaging member 43 engaged therewith is also restricted. Therefore, the rotation of the antenna 4 around the axis of the rotation shaft 43 is restricted.
[0016]
When the cover 3 is attached to the apparatus housing 2 in this state, the U-shaped groove 31 of the cover 3 is loosely inserted into the rotation shaft 41, and the entire rotation prevention member 5 is covered by the rib 33 as shown in FIG. Is pressed against the wall surface of the recessed fitting portion 21 and the movement of the rotation preventing member 5 in the axial direction of the rotation shaft 41 is restricted, so that the fitting state between the rotation preventing member 5 and the engaging member 43 is maintained. Since this state is covered by the cover 3, the antenna 4 is not intentionally or accidentally rotated around the axis of the rotation shaft 43 by a third party.
[0017]
In particular, since the movement of the anti-rotation member 5 is regulated by the cover 3 attached to the apparatus housing 2 to regulate the rotation of the rotation shaft 41, a special for regulating the movement of the anti-rotation member 5 By eliminating the need for such a member, not only the number of parts is reduced, but also the structure is simplified. Further, the engagement between the engagement member 43 and the rotation preventing member 5 is made by a large number of engagement projections 44 provided on the outer peripheral portion of the engagement member 43 and a large number of engagement recesses 52 provided on the outer periphery of the hollow portion 51. It is what I do. Accordingly, the interval between the engaging protrusions 44 adjacent to each other and the interval between the engaging recesses 52 can be reduced, and the pitch of the adjustment angle of the antenna 2 can be reduced, so that the sensitivity of the antenna 2 can be improved. it can.
[0018]
FIG. 7 is a perspective view of an essential part showing a second embodiment of the present invention.
The second embodiment is different from the first embodiment described above in that the anti-rotation member 5 is provided with a notch 55 formed in a width B communicating with the hollow 51 and the fitting recess 21. This is in the point that the protruding strip 25 to which the notch 55 is fitted is provided at the center of the lower portion. The width B of the notch 55 is formed slightly larger than the diameter of the rotation shaft 41.
[0019]
With this configuration, after the rotation shaft 41 is attached to the device housing 2, the anti-rotation member 5 can be fitted and inserted into the rotation shaft 41 through the notch 55. Improved workability. As with the first embodiment described above, the anti-rotation member 5 inserted into the rotation shaft 41 is fitted into the fitting recess 21 of the device housing 2 and simultaneously the anti-rotation member 5. The engagement protrusions 44 of the engagement member 43 are engaged with the engagement recesses 52. At this time, the notch portion 55 of the rotation preventing member 5 is fitted into the protrusion 25 of the device housing 2, so that the reduction in the rigidity of the rotation preventing member 5 due to the provision of the notch 55 is the protrusion. 25. Therefore, after that, even if the antenna 4 is forced to rotate, the rotation can be reliably restricted.
[0020]
In this embodiment, the engagement member 43 and the rotation prevention member 5 are engaged by the engagement of the engagement protrusion 44 and the engagement recess 52. The hollow portion 51 of the member 5 may be a polygon that engages with each other, or the hollow portion 51 may have a shape provided with only one side of the polygon, and various design changes are possible. In addition, the fitting recess 21 and the anti-rotation member 5 which is fitted to the concave portion 21 and whose rotation is restricted are formed in a square shape, but other polygonal or circular anti-rotation protrusions are formed on the outer peripheral portion. What protruded may be sufficient, and the point should just be the structure which regulates rotation of the rotation prevention member 5 fitted to the fitting recessed part 21. FIG.
[0021]
【The invention's effect】
As described above , according to the present invention, since the directivity of the antenna once adjusted is not changed by mistake, the sensitivity of the antenna can be maintained. In addition, since the interval between the engaging protrusions adjacent to each other can be reduced, the pitch of the adjustment angle of the antenna can be reduced, so that the sensitivity of the antenna can be improved. Further, not only the number of parts is reduced, but also the structure is simplified.
[Brief description of the drawings]
FIG. 1 is a plan view of a base station for wireless transmission and reception employing an antenna mounting structure according to the present invention.
FIG. 2 is a front view of a radio transmission / reception master device adopting the antenna mounting structure according to the present invention. FIG. 3 is a perspective view of a main part showing the antenna mounting structure according to the present invention.
4A and 4B show a detent member in the antenna mounting structure according to the present invention, where FIG. 4A is a front view and FIG. 4B is a side view.
5A and 5B are side views of the main part of the antenna mounting structure according to the present invention, in which FIG. 5A shows a state where the cover is removed, and FIG. 5B shows a state where the cover is attached.
6 is a cross-sectional view taken along the line VI-VI in FIG. 1. FIG. 6A shows a state where the cover is removed, and FIG. 6B shows a state where the cover is attached.
FIG. 7 is a perspective view of a main part showing a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Radio | wireless transmission / reception base unit, 2 ... Apparatus housing, 3 ... Cover, 4 ... Antenna, 5 ... Anti-rotation member, 21 ... Fitting recessed part, 22 ... Support hole, 25 ... Projection body, 31 ... U-shaped groove , 41 ... rotating shaft, 42 ... support piece, 43 ... engagement member, 44, 53 ... engagement protrusion, 45, 52 ... engagement recess, 51 ... hollow part, 55 ... notch.

Claims (1)

An antenna mounting structure in which an end portion of a rotation shaft provided at a base portion of an antenna is supported and fixed in an apparatus housing so that the rotation shaft is rotatably supported around an axis line. And an anti-rotation member which is held so as to be restricted from rotating by being engaged with an engaging recess provided in the apparatus housing so as to be detachable from the engaging member. The engaging member can be freely engaged with and disengaged from the rotation preventing member in the rotational direction of the rotating shaft, and the engaging member is formed in a disc shape so that the outer peripheral portion is equiangular in the circumferential direction. A plurality of engaging projections formed at intervals, a circular hollow portion provided in the rotation preventing member, and a plurality of engaging recesses engaging with the engaging projections on the outer periphery of the hollow portion. The anti-rotation member is removed from the fitting recess of the device housing by a cover attached to the housing. Antenna mounting structure, characterized in that the regulating.

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