KR101928693B1 - Connecting device for circular columns - Google Patents

Abstract

The present invention relates to a hinge connecting device for a circular strut, comprising: a first bracket portion installed in a circular strut; a second bracket portion provide in an end portion of a horizontal frame located between two adjacent circular struts to correspond to the first bracket portion; and a rotation connecting portion rotatably connecting the first bracket portion and the second bracket portion. According to the present invention, the hinge connecting device can be easily installed on a plane surface or even on a sloped surface such that operation time and cost can be reduced, and the operation efficiency can be improved.

Description

Connecting device for circular columns < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge connection apparatus, and more particularly, to a hinge connection apparatus for a circular holding stub that can be installed easily regardless of a terrain, thereby reducing work time and cost and improving working efficiency.

Generally, a fence is installed on the edge of a park, a mountain trail or a road or the center of a road so as to mark a boundary or prevent a specific place from entering, and a stairway of a building, The railings are installed.

These conventional fences are fixed by screwing a fence or a horizontal frame to both sides of the stanchions provided at regular intervals, as disclosed in Registration Practice No. 20-0420140.

However, the terrain in which the fence is installed is also used for a sloping terrain, not a flat terrain.

In order to overcome this problem, a rotatable structure has been developed and used. However, in the case of a column having a circular cross section, as shown in Fig. 1, And the through holes 1a are elongated in the longitudinal direction.

The brackets 2 each having the hinge holes 2a at both ends thereof are passed through the through holes 1a and welded to the hinge holes 2a. 3) is rotatably installed, a fence is provided on the inclined terrain.

However, there is a process of forming the through hole 1a for fixing the circular column 1 to the conventional column 1 and a process of welding the bracket 2 through the through hole 1a, The time and cost are increased, and the surface coating of the circular column 1 is broken at the time of welding, thereby generating rust.

Accordingly, there is an urgent need to develop a technique capable of shortening the time and cost as well as extending the service life by easily installing a fence structure on a circular land in a sloping terrain.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an apparatus and a method for manufacturing a bracket, And a rotation connecting portion for connecting the first bracket portion and the second bracket portion so as to be rotatable, so that it can be installed easily on a sloped surface as well as a flat surface, thereby reducing work time and cost, It is an object of the present invention to provide a circular holding hinge connecting device capable of improving the hinge connection.

According to another aspect of the present invention, there is provided an apparatus for manufacturing a bracket comprising a first bracket provided on a circular support, a second bracket provided on an end of a horizontal frame positioned between the adjacent two circular supports to correspond to the first bracket, And a rotation connection portion for connecting the first bracket portion and the second bracket portion in a rotatable manner.

Preferably, the first bracket portion includes a first base bracket formed in a predetermined arc corresponding to an outer periphery of the circular support, a first fixing bracket protruding from the first base bracket in a pair, And a first fixing part for fixing the first base bracket to the circular support.

The first fixing portion includes a first fixing hole formed in the first base bracket, a first fixing hole having a thread on the inner surface thereof and formed on the circular column to correspond to each of the first mounting holes, And a first fixing bolt screwed to the first fixing hole and the first fixing hole located on a straight line to fix the first base bracket to the circular support.

The second bracket may include a second base bracket positioned at an end of the horizontal frame, a second base bracket disposed on the second base bracket so as to be positioned in the installation space, A second fixing block protruding from the second base bracket to be inserted into the horizontal frame, and a second fixing part fixing the second fixing block to the horizontal frame.

The second fixing part may include a second fixing hole having a thread on the inner side and formed at an end of the horizontal frame into which the second fixing block is inserted, and a second fixing hole screwed into the second fixing hole, And a second fixing bolt for pressing the outer circumferential surface of the second fixing block to fix the second fixing block to the horizontal frame.

The rotation connection portion may include a first hinge hole formed on the first fixing bracket and formed on the same horizontal line, a second hinge hole formed on the second fixing bracket to correspond to the first hinge hole, And a hinge nut which is fastened to an end portion of the hinge bolt passing through the first hinge hole and the second hinge hole. The hinge bolt includes a first hinge hole and a second hinge hole.

The second hinge hole is formed to be long in the protruding direction of the second fixing bracket.

The second hinge hole includes a second horizontal hinge hole formed to be elongated in a protruding direction of the second fixing bracket, and a second vertical hinge hole formed to be long in a direction orthogonal to the second horizontal hinge hole.

And the second vertical hinge hole is formed to pass the middle portion of the second horizontal hinge hole.

In addition, the second hinge holes are formed long, and a plurality of the second hinge holes are formed in the circumferential direction with respect to the center portion.

And rotating means for adjusting the angle of the second bracket portion with respect to the rotation connection portion.

In addition, the pivoting means may include a pivot bushing having a pivoting mounting hole and a bushing head formed on the second fixing bracket, the pivoting bushing being inserted through one end of the pivoting mounting hole and the pivoting bushing protruding through the pivoting mounting hole And a pivoting nut coupled to an end of the bushing and rotatable in the pivoting mounting hole together with the pivoting bushing.

The rotation connection portion may include a first hinge hole formed on the first fixing bracket and formed on the same horizontal line, a second hinge hole formed on the rotation bushing corresponding to the first hinge hole, And a hinge nut which is fastened to an end of the hinge bolt passing through the first hinge hole and the second hinge hole. The hinge bolt includes a first hinge hole and a second hinge hole.

Also, the second hinge hole is formed long.

The second hinge hole includes a second horizontal hinge hole formed to be elongated in the protruding direction of the second fixing bracket, and a second vertical hinge hole formed to be perpendicular to the second horizontal hinge hole.

In addition, the second vertical hinge hole is formed to pass the middle portion of the second horizontal hinge hole.

The second hinge holes are formed long, and a plurality of the second hinge holes are formed in the circumferential direction with respect to the center portion.

And a rotation holding unit for maintaining a rotation angle of the rotation bushing and the second fixing bracket.

The pivotal holding unit may include a pivotal holding groove formed at a predetermined distance along the inner surface of the pivotal mounting hole, a pivotal mounting hole formed in the pivotal bushing to correspond to any one of the pivotal holding grooves, A rotation-sustaining ball, a part of which protrudes outward from the outer end of the rotation-sustaining groove to be seated in the rotation-sustaining groove, and a protrusion formed on the outer end of the rotation-setting hole to prevent the rotation-sustaining ball from being detached to the outer end of the rotation- The rotation holding spring provided on the rotation mounting hole to press the rotation holding ball in the outward direction and the rotation holding spring to prevent the rotation holding spring from being released to the inner end of the rotation setting hole, And a rotation holding bolt threaded into the inside end of the rotation setting hole.

The pivotal holding unit may include a plurality of first rotation holding protrusions formed along the periphery of the pivot mounting hole and a second pivot holding protrusion formed on the bushing head of the pivoting bushing to correspond to the first pivot holding protrusion, .

As described above, the circular holding hinge connecting apparatus according to the present invention is a very useful and effective invention that can be installed easily on a sloped surface as well as a flat surface, thereby reducing work time and cost and improving working efficiency .

1 is a view showing a hinge connection apparatus according to the present invention,
FIG. 2 is a view showing a separated state of the hinge connecting apparatus according to the present invention,
FIG. 3 is a view showing a first bracket part, a second bracket part, and a rotation connecting part according to the present invention,
FIG. 4 is a view showing another embodiment of the rotation connecting portion according to the present invention,
5 is a view showing another embodiment of the rotation connection part according to the present invention,
6 is a view showing a hinge connection apparatus of another embodiment according to the present invention,
FIG. 7 is a view showing a rotating means according to the present invention,
FIG. 8 is a view showing another embodiment of the rotation connection portion of FIG. 6 according to the present invention,
FIG. 9 is a view showing a rotation holding unit of the rotation means according to the present invention,
10 is a view showing another embodiment of the pivotal holding unit according to the present invention,
Fig. 11 is a view showing the installation state of the horizontal frame by the turning means according to the present invention. Fig.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention.

Throughout the specification, when an element is referred to as "comprising" or " including ", it is meant that the element does not exclude other elements, do. Further, the term "part" described in the specification means a unit for processing at least one function or operation. Also, the terms " a or ", "one "," the ", and the like are synonyms in the context of describing the invention (particularly in the context of the following claims) May be used in a sense including both singular and plural, unless the context clearly dictates otherwise.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a view showing a hinge connecting apparatus according to the present invention, FIG. 2 is a view showing a state of disconnection of a hinge connecting apparatus according to the present invention, FIG. 3 is a view showing a first bracket unit and a second bracket according to the present invention, FIG. 4 is a view showing another embodiment of the rotation connection part according to the present invention, FIG. 5 is a view showing still another embodiment of the rotation connection part according to the present invention, and FIG. 6 is a view showing a hinge connection device according to another embodiment of the present invention, FIG. 7 is a view showing a rotation means according to the present invention, and FIG. 8 is a view showing another embodiment of the rotation connection portion of FIG. 10 is a view showing another embodiment of the pivotal holding unit according to the present invention, and Fig. 11 is a perspective view of the pivotal holding unit according to the present invention. Fig. Of the horizontal frame A diagram showing a device status.

As shown in the figure, the circular holding hinge connection device 10 includes a first bracket part 300, a second bracket part 400, and a rotation connection part 500.

The first bracket part (300) is installed in the circular support (100).

The second bracket part 400 is provided at an end of the horizontal frame 200 positioned between two adjacent circular pillars 100 corresponding to the first bracket part 300.

A plurality of horizontal frames 200 are provided between the two circular pillars 100, and a plurality of wires, chains, and the like are provided between the horizontal frames 200.

The rotation connection part 500 is provided to connect the first bracket part 300 and the second bracket part 400 in a rotatable manner.

According to the circular holding hinge connection apparatus 10, the first bracket unit 300 can be easily installed at a necessary position in the outer periphery of the circular support 100, and the second bracket unit 400 can be easily installed in the horizontal frame 200 ).

The first bracket part 300 and the second bracket part 400 can be easily connected to each other by the rotation connection part 500 so that the working efficiency can be improved in any area.

3, the first bracket unit 300 includes a first base bracket 310, a first fixing bracket 320, and a first fixing unit 330. As shown in FIG.

The first base bracket 310 is formed with a constant arc corresponding to the outer periphery of the circular support 100.

The first fixing brackets 320 are protruded from the first base bracket 310 in a pair, and a mounting space 340 is formed therebetween.

The first fixing part 330 is provided to fix the first base bracket 310 to the circular support 100.

The first fixing part 330 includes a first fixing hole 332, a first fixing hole 334, and a first fixing bolt 336.

A plurality of first installation holes 332 are formed in the first base bracket 310.

The first fixing holes 334 are formed on the circular support 100 so as to correspond to the first installation holes 332 with threads on the inner side.

The first fixing bolt 336 is screwed to the first fixing hole 332 and the first fixing hole 334 positioned in a straight line to fix the first base bracket 310 to the circular column 100 do.

Here, the horizontal frame 200 is a hollow circular tube.

The second bracket part 400 includes a second base bracket 410 and a second fixing bracket 420, a second fixing block 430 and a second fixing part 440.

The second base bracket 410 is located at the end of the horizontal frame 200 and is formed in a circular shape.

The second fixing bracket 420 is protruded from the second base bracket 410 so as to be positioned in the installation space 340.

The second fixing block 430 is protruded from the second base bracket 410 to be inserted into the horizontal frame 200.

The second fixing part 440 is provided to fix the second fixing block 430 to the horizontal frame 200.

The second fixing portion 440 is composed of a second fixing hole 442 and a second fixing bolt 444.

The second fixing hole 442 has a thread on the inner side and is formed at the end of the horizontal frame 200 into which the second fixing block 430 is inserted.

The second fixing bolt 444 is screwed to the second fixing hole 442 so that the inserted end of the second fixing bolt 444 presses the outer circumferential surface of the second fixing block 430, .

The rotation connection portion 500 includes a first hinge hole 510 and a second hinge hole 520, a hinge bolt 530, and a hinge nut 540.

The first hinge holes 510 are formed on the first fixing brackets 320, and are formed on the same horizontal line.

The second hinge hole 520 is formed in the second fixing bracket 420 so as to correspond to the first hinge hole 510.

The hinge bolt 530 is installed through the first hinge hole 510 and the second hinge hole 520 located on a straight line.

The hinge nut 540 is fastened to the end of the hinge bolt 530 passing through the first hinge hole 510 and the second hinge hole 520.

Here, the second hinge holes 520 are elongated in the protruding direction of the second fixing bracket 420.

The connection position of the first bracket part 300 and the second bracket part 400 can be adjusted by the second hinge hole 520, so that it can be easily installed corresponding to the topography.

Meanwhile, as shown in FIG. 4, the second hinge hole 520 'of another embodiment includes a second horizontal hinge hole 522' and a second vertical hinge hole 524 '.

The second horizontal hinge hole 522 'is elongated in the protruding direction of the second fixing bracket 420.

The second vertical hinge holes 524 'are elongated to be orthogonal to the second horizontal hinge holes 522'.

Here, the second vertical hinge hole 524 'is formed so as to pass through the middle portion of the second horizontal hinge hole 522'.

It goes without saying that the second vertical hinge hole 524 'may be formed to pass through the middle portion of the second horizontal hinge hole 522' so as not to be orthogonal to the second horizontal hinge hole 522 '.

The hinge bolt 530 may be positioned at any one of the second horizontal hinge hole 522 'and the second vertical hinge hole 524' so that the horizontal frame 200 is inclined at a predetermined angle It can be installed or leveled.

As shown in Fig. 5, the second hinge holes 520 " of another embodiment are elongated, and a plurality of hinge holes 520 "are formed circumferentially with respect to the center.

The hinge bolt 530 can be positioned in any one of the plurality of second hinge holes 520 '' formed in the circumferential direction, so that the hinge bolt 530 can be more easily connected corresponding to various terrains.

In other words, the horizontal frame 200 may be inclined at an angle or horizontally.

Each of the second hinge holes 520 "

Accordingly, the connection positions of the first bracket part 300 and the second bracket part 400 can be connected differently, so that it is possible to easily install the first bracket part 300 in correspondence with the installation terrain even if it is not an expert.

Further, a second latching hole 522 " is formed at an outer end of each of the second hinge holes 520 " to extend at least one side of the second latching hole 522 " so that the hinge bolt 530 is hooked.

Accordingly, the first bracket part 300 and the second bracket part 400 can be firmly connected to each other, so that it is possible to maintain firmness even for long-time use.

6, the circular holding hinge connection device 10 of another embodiment further includes a rotation means 600. [

The circular holding hinge connection apparatus 10 of another embodiment includes the first bracket unit 300, the second bracket unit 400 and the rotation connection unit 700, and the first bracket unit 300 and the second bracket unit 300, (400) are as described above and their explanation is omitted.

The rotation unit 600 is provided to adjust the angle of the second bracket unit 400 with respect to the rotation connection unit 700.

7, the pivoting means 600 includes a pivoting bushing 620 and a pivoting nut 630. As shown in Fig.

The rotation mounting hole 610 is formed in the second fixing bracket 420.

The rotary bushing 620 has a bushing head 622 and is installed through one end of the rotary installation hole 610.

The pivoting nut 630 is coupled to the end of the pivoting bushing 620 protruding through the pivoting mounting hole 610 and is rotatable together with the pivoting bushing 620 in the pivoting mounting hole 610.

Of course, the rotating bushing 620 contacting the inner surface of the rotation mounting hole 610 may be provided with a bearing, and the bearing may be made of a resin material having a plurality of balls or a low frictional force.

It is preferable that such a bearing is made of a fluororesin and installed in the rotating bushing 620.

6 and 7, the rotary connector 700 includes a first hinge hole 710 and a second hinge hole 720, a hinge bolt 730, and a hinge nut 740. [

The first hinge holes 710 are formed on the first fixing brackets 320 and are formed on the same horizontal line.

The second hinge hole 720 is formed in the rotation bushing 620 so as to correspond to the first hinge hole 710.

The hinge bolt 730 is installed through the first hinge hole 710 and the second hinge hole 720 located on a straight line.

The hinge nut 740 is fastened to the end of the hinge bolt 730 passing through the first hinge hole 710 and the second hinge hole 720.

Here, the second hinge hole 720 is formed long in one embodiment, and is formed long in the protruding direction of the second fixing bracket 420.

The connection position of the first bracket part 300 and the second bracket part 400 can be adjusted by the second hinge hole 720, so that it can be easily installed corresponding to the terrain.

Meanwhile, the second hinge hole 720 'of another embodiment shown in FIG. 8 is composed of a second horizontal hinge hole 722' and a second vertical hinge hole 724 '.

The second horizontal hinge hole 722 'is elongated in the protruding direction of the second fixing bracket 420 and the second vertical hinge hole 724' is elongated to be orthogonal to the second horizontal hinge hole 722 ' .

Here, the second vertical hinge holes 724 'are formed to pass through the middle portion of the second horizontal hinge holes 722'.

It goes without saying that the second vertical hinge hole 724 'may be formed so as to pass the middle portion of the second horizontal hinge hole 722' so as not to be orthogonal to the second horizontal hinge hole 722 '.

The hinge bolt 730 can be positioned at any one of the second horizontal hinge hole 722 'and the second vertical hinge hole 724', so that the hinge bolt 730 can be more easily connected corresponding to various terrains.

Further, the second hinge holes 720 "of another embodiment are formed long, and a plurality of the second hinge holes 720 " are formed circumferentially with respect to the center.

The hinge bolts 730 can be positioned in any one of the plurality of second hinge holes 720 'formed in the circumferential direction, so that the hinge bolts 730 can be more easily connected corresponding to various terrains.

Here, a second latching hole 722 " is formed at one end of each of the second hinge holes 720 " so as to extend from one side or the other, so that the hinge bolt 730 is hooked.

Accordingly, the first bracket part 300 and the second bracket part 400 can be firmly connected to each other, so that it is possible to maintain firmness even for long-time use.

As shown in FIG. 9, the rotation unit 600 further includes a rotation holding unit 640.

The rotation holding part 640 is provided to maintain the rotation angle of the rotation bushing 620 and the second fixing bracket 420.

The rotation holding portion 640 includes a rotation holding groove 641 and a rotation setting hole 642, a rotation holding ball 643, a separation preventing blade 644, a rotation holding spring 645, and a rotation holding bolt 646 do.

The rotation holding grooves 641 are formed at regular intervals along the inner surface of the rotation setting hole 642. [

And is formed in the pivot bushing 620 so as to correspond to any one of the pivot mounting holes 642 and the pivot holding grooves 641.

The rotation-sustaining ball 643 is positioned in the rotation-setting hole 642, and a part thereof protrudes outward from the outer end and is seated in the rotation-holding groove 641.

The release braking tongue 644 is protruded from the outer end of the rotation bore 642 to prevent the rotation holding ball 643 from being detached to the outer end of the rotation bore 642.

The rotation holding spring 645 is provided on the rotation setting hole 642 so as to press the rotation holding ball 643 in the outward direction.

The rotation holding bolt 646 prevents the rotation holding spring 645 from being released to the inside end of the rotation mounting hole 642 and is screwed into the inside end of the rotation mounting hole 642 so as to adjust the pressing force, do.

It is a matter of course that a thread is formed on the inner surface of the inner end of the rotation mounting hole 642 to which the rotation holding bolt 646 is fastened.

Further, it is preferable that a polygonal wrench groove or a driver groove is formed in the outer end surface of the rotation holding bolt 646 and it is easily fastened using a corresponding wrench or a screwdriver.

According to the pivotal holding unit 640, the connection angle of the first bracket unit 300 and the second bracket unit 400 can be adjusted, and the connected angle can be maintained, so that the rigidity can be maintained.

Meanwhile, as shown in FIG. 10, the rotation holding portion 640 'of another embodiment includes a first rotation holding projection 642' and a second rotation holding projection 644 '.

A plurality of first rotation holding protrusions 642 'are formed along the periphery of the rotation setting hole 642.

The second rotation holding projection 644 'is formed in the bushing head 622 of the rotation bushing 620 so as to correspond to the first rotation holding projection 642'.

According to the pivotal holding unit 640 ', not only the angle of connection between the first bracket unit 300 and the second bracket unit 400 can be adjusted, but also the connected angle can be maintained to maintain the rigidity.

The mounting state of the turning means 600 having the second hinge holes 720, 720 ', 720 "and the pivotal holding portions 640, 640' of the respective embodiments is the same as that of the horizontal frame 200, May be installed at an angle to be inclined or in a horizontal position.

Of course, since the second hinge holes 720, 720 ', 720 "are elongated, the position of the hinge bolt 530 can be adjusted to correspond to the length of the horizontal frame 200.

The installation height of the horizontal frame 200 in a horizontal state can also be adjusted.

The installation angle of the horizontal frame 200 can be maintained at an angle by the pivotal holders 640 and 640 'of the respective embodiments, and it is possible to extend the service life as well as the rigidity.

10: hinge connection device 100: circular holding
200: horizontal frame 300: first bracket part
400: second bracket part 500, 700: rotation connection part
600: rotating means 640:

Claims (10)

A first bracket part 300 installed on a circular support;
A second bracket part 400 provided at an end of a horizontal frame positioned between the adjacent two circular supports to correspond to the first bracket part; And
And a rotation connection portion (700) for connecting the first bracket portion and the second bracket portion in a rotatable manner,
The first bracket part (300)
A first base bracket 310 formed at a predetermined arc corresponding to an outer periphery of the circular support;
A first fixing bracket (320) protruding from the first base bracket in a pair, and having an installation space formed therebetween; And
And a first fixing part (330) for fixing the first base bracket to the circular support,
The first fixing part (330)
A plurality of first mounting holes (332) formed in the first base bracket;
A first fixing hole (334) having a thread on the inner side and formed in the circular support to correspond to each of the first installation holes; And
And a first fixing bolt (336) screwed to the first fixing hole and the first fixing hole, which are located on a straight line, for fixing the first base bracket to the circular support,
The horizontal frame is a hollow circular tube,
The second bracket part (400)
A second base bracket 410 positioned at an end of the horizontal frame;
A second fixing bracket 420 protruding from the second base bracket to be positioned in the installation space;
A second fixing block 430 protruding from the second base bracket to be inserted into the horizontal frame; And
And a second fixing part (440) for fixing the second fixing block to the horizontal frame,
The second fixing portion 440 may be formed of,
A second fixing hole 442 having a thread on the inner side and formed at an end of the horizontal frame into which the second fixing block is inserted; And
And a second fixing bolt (444) screwed into the second fixing hole, the inserted end of the second fixing bolt (444) pressing the outer circumferential surface of the second fixing block to fix the second fixing block to the horizontal frame,
And rotating means (600) for adjusting the angle of the second bracket portion with respect to the rotation connection portion,
The rotating means (600)
A rotation mounting hole (610) formed in the second fixing bracket;
A rotary bushing 620 having a bushing head and installed at one end of the rotary mounting hole; And
And a pivot nut (630) coupled to an end of the pivot bushing protruding through the pivot mounting hole to be rotatable in the pivot hole together with the pivot bushing,
The rotation connection portion 700 includes:
A first hinge hole 710 formed on each of the first fixing brackets and formed on the same horizontal line;
A second hinge hole 720 'formed in the pivot bushing to correspond to the first hinge hole;
A hinge bolt (730) installed through the first hinge hole and the second hinge hole, which are positioned on a straight line; And
And a hinge nut (740) fastened to an end of the hinge bolt passing through the first hinge hole and the second hinge hole,
The second hinge holes 720 'are elongated, and a plurality of the second hinge holes 720' are formed in the circumferential direction with respect to the central portion, so that the hinge bolts 730 can be positioned in any one of them, In addition,
A second latching hole 722 " is formed at an outer end of each of the second hinge holes 720 " so as to extend from one side or the other, so that the hinge bolt 730 is engaged,
And a rotation holding unit 640 for maintaining a rotation angle of the rotation bushing 620 and the second fixing bracket 420,
The rotation holding unit 640,
A rotation holding groove (641) formed at regular intervals along the inner surface of the rotation setting hole;
A rotation setting hole (642) formed in the rotation bushing to correspond to any one of the rotation holding grooves;
A rotation-sustaining ball 643 which is located in the rotation-setting hole, a part of which protrudes outward from the outer end and is seated in the rotation-holding groove;
(644) protruding from the outer end of the pivoting mounting hole to prevent the pivoting ball from being detached to the outer end of the pivoting mounting hole;
A rotation holding spring (645) provided on the rotation setting hole to press the rotation holding ball in an outward direction; And
And a rotation holding bolt (646) screwed into the inside end of the pivot mounting hole so as to prevent the pivot holding spring from being released to the inside end of the pivot mounting hole and adjust the pressing force, Connection device. delete delete delete delete delete delete delete delete delete

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