JPH11193681A - Elevation frame and opening frame with leg opening function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevation frame and an opening frame with a leg opening function, capable of sufficiently improving the storing and carrying properties of the elevation frame and the opening frame and giving a better appearance in storage and carriage by storing auxiliary supports in supports. SOLUTION: Right and left auxiliary supports 21, 22, 32, 33 can be fitted throughout sectionally U-shaped right and left supports 17, 18, 29, 30 at a position of the maximum contraction and the storing and carrying properties of an elevation frame 15 and an opening frame or a working scaffold base using these can, therefore, be improved. In appearance, the right and left auxiliary supports 21, 22, 32, 33 does not significantly project sideways from the right and left supports 17, 18, 29, 30 and so users and purchasers are interested in a compact figure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting frame and an opening frame having an open leg function used for a ladder, a stepladder serving as a ladder, a stepladder, a work platform, a work tower, and the like.

[0002]

2. Description of the Related Art There is a lifting frame 80 shown in FIG. 10 as an example of a lifting frame used for a ladder, a stepladder, a stepladder, a scaffold work table, a work tower, and the like. This lifting frame 8
0, as shown in the figure, a pair of columns 81, 82 extending in the vertical direction at intervals in the width direction, a plurality of stepping bars 83 suspended laterally at intervals between the columns 81, 82, 8
A lower connecting pipe 87 for connecting the lower ends of the first and second columns 82 and 82; a lower end extending downward from the lower end surfaces of the first and second columns 81 and 82 so that the lower end thereof is pivotally supported by the outer surfaces of the columns 81 and 82; Auxiliary supports 85, 86 that can be installed on the surface 84, and an extending amount that is extended and contracted between the auxiliary columns 85, 86 and the lower connecting pipe 87 to regulate the amount of the auxiliary columns 85, 86 extending in the width direction. It is composed of adjusting tubes 88 and 89. FIG. 10 shows a case in which the lifting frame 80 is used as a support leg of the scaffolding work table, and the upper ends of the columns 81 and 82 are connected to one end of the top plate 79.

Each of the auxiliary columns 85 and 86 has the same structure symmetrical to the left and right, and is pivotally supported on the outer surfaces of the columns 81 and 82 so as to be capable of swinging. Telescoping leg 91 which can be freely inserted, and a fixing device 92 which is attached to the lower part of the inner surface of the oscillating leg 90 and can fix the telescoping leg 91 to the oscillating leg 90
It is composed of

With the above-described configuration, the amount of extension of the auxiliary columns 85 and 86 of the lifting frame 80 can be adjusted by appropriately adjusting the amount of expansion and contraction of the extension amount adjusting tubes 88 and 89. At both ends of the lower connecting pipe 87, fixing devices 93 that can fix the overhang amount adjusting pipes 88 and 89 at arbitrary expansion and contraction positions are attached.
Therefore, the lifting frame 80 can be used in a stable state in a form corresponding to the place of use.

[0005] Although this is not shown, a pair of columns extending in the vertical direction at intervals in the width direction, and
A lower connecting pipe for connecting the lower ends to each other, and an auxiliary column which is pivotally supported at the upper end to the outer surface of the column and whose lower end extends downward from the lower surface of the column and can be installed on the floor surface. The same applies to an opening frame which is provided between the auxiliary support and the lower connecting pipe so as to be extendable and contractible, and comprises an overhang amount adjusting pipe for controlling the amount of the auxiliary support in the width direction.

[0006]

However, the lifting frame and the opening frame having the leg opening function described above still have the following problems to be solved. That is, each of the columns 81 and 82 of the lifting frame 80 and the swinging legs 90 of the auxiliary columns 85 and 86 usually have a hollow cylindrical cross section. On the other hand, the lifting frame 80
The upper ends of the swinging legs 90 are pivotally supported on the supporting columns 81 and 82 via brackets 94 protruding outward. Therefore, as shown by phantom lines in FIG.
Even when 6 is moved to the position where the overhang amount adjusting tubes 88 and 89 are at the maximum retracted position, the inner surface of the fixing device 92 comes into contact with the outer surfaces of the columns 81 and 82. That is,
Since the auxiliary columns 85 and 86 protrude laterally from the columns 81 and 82, the storage and transportability of the lifting frame 80 could not be sufficiently improved. Further, since the lifting frame 80 does not have a clean form, it is inferior in aesthetics. This is the same for the opening frame formed of the rectangular frame.

[0007] The present invention has been made in view of such circumstances, and by making it possible to store the auxiliary column in the column, it is possible to sufficiently enhance the storage and transportability of the lifting frame and the opening frame. Further, it is an object of the present invention to provide a lifting frame and an opening frame having an open leg function that can also improve the appearance during storage and transport.

[0008]

According to the present invention, there is provided a semiconductor device comprising:
The lifting frame having the described leg-opening function, a pair of struts extending in the vertical direction at intervals in the width direction, a plurality of step beams crossed at intervals between the struts, and a lower end of the strut A lower connecting pipe connecting the two, and an auxiliary support that is pivotally supported at the upper end thereof in the middle of the support and has a lower end extending downward from the lower end surface of the support and installed on the floor surface, An elevating frame having an open leg function, which is provided between the auxiliary support and the lower connecting pipe so as to be extendable and retractable and regulates an extension amount of the auxiliary support in a width direction; Is formed in a U-shaped cross section that opens laterally, and the cross section of the auxiliary strut is formed in a shape that can be fitted into the U-shaped cross section, and the overhang amount adjusting tube is at a maximum retracted position. At this time, the auxiliary column is inserted into the column.

The lifting frame having the leg opening function according to the second aspect is the lifting frame having the leg opening function according to the first aspect,
The auxiliary column includes a swing leg swingably supported on an outer surface of the support column, a telescopic leg slidably fitted into the swing leg, and an auxiliary leg attached to a lower portion of an inner surface of the swing leg. A fixing device capable of fixing the telescopic leg to the swinging leg; and a through hole through which the fixing device can be fitted is formed at a lower end portion of the support post. Through the support.

An opening frame having a leg opening function according to a third aspect of the present invention comprises a pair of columns extending in the vertical direction at intervals in the width direction, and an upper and lower connecting pipe connecting the upper and lower ends of the columns. An auxiliary column having an upper end swingably supported at a middle portion of the column and a lower end extending downward from a lower end surface of the column to be installed on a floor surface; and the auxiliary column and the lower connecting pipe. In the opening frame having a leg-opening function, which is configured to extend and contract between the supporting column and a projecting amount adjusting tube for regulating the projecting amount in the width direction of the auxiliary column, the cross section of the column is laterally The auxiliary column is formed in an open U-shaped cross section, and a cross section of the auxiliary column is formed so as to be fittable in the U-shaped cross section. When the overhang amount adjusting tube is at the maximum retracted position, the auxiliary column is Is inserted into.

The opening frame having the leg opening function according to the fourth aspect is the opening frame having the leg opening function according to the third aspect,
The auxiliary column includes a swing leg swingably supported on an outer surface of the support column, a telescopic leg slidably fitted into the swing leg, and an auxiliary leg attached to a lower portion of an inner surface of the swing leg. A fixing device capable of fixing the telescopic leg to the swinging leg; and a through hole through which the fixing device can be fitted is formed at a lower end portion of the support post. In the maximum retracted position, the fixing device includes the fixing hole. Through the support.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Hereinafter, a lifting frame and an opening frame having a leg opening function according to an embodiment of the present invention will be described with reference to FIGS. In this embodiment, the lifting frame and the opening frame are applied to the work scaffold A. As shown in FIG. 1, the work scaffold A is substantially
A scaffold plate 11 formed of a horizontally long rectangular plate having a work floor surface 10 on the upper surface, and upper ends thereof are respectively foldably connected to left and right ends of the scaffold plate 11 via folding connection mechanisms 12 and 13, and a lower end thereof is a floor. A lifting frame 15 and an opening frame 16 are provided on the surface 14.

The lifting frame 15 is shown in FIG. 1 and FIG.
4 and a pair of left and right columns 17 extending vertically at predetermined intervals in the width direction and extending at the upper end to the left end of the scaffolding plate 11 via the folding coupling mechanism 12 in the side view shown in FIG. , 18, a plurality of treads 19, which are vertically spaced between the left and right supports 17, 18, and a lower connecting pipe 20 for connecting the lower ends of the left and right supports 17, 18 to each other
The upper end is a middle part of the left and right columns 17, 18 and is pivotally supported on the outer surface thereof, and the lower end extends downward from the lower end surfaces of the left and right columns 17, 18 to form a floor surface. 14 and left and right auxiliary columns 21 and 22 and left and right auxiliary columns 2
Left and right, which are interposed between the first and second connecting pipes 20 and the lower connecting pipe 20, and regulate the widthwise extension of the left and right auxiliary supporting columns 21 and 22.
Right overhang amount adjusting tubes 23 and 24 are provided.

The left and right auxiliary columns 21 and 22 are shown in FIGS.
As shown in FIG. 5, each of the telescopic legs has a telescopic tube structure in which the telescopic legs 26 are slidably inserted into the swinging legs 25, and the telescopic legs 26 are fixed at arbitrary telescopic positions. A locking device 27 is provided at the lower portion of the inner surface of the swing leg 25. Also, as shown in FIGS. 1 and 3 to 5,
A telescopic tube structure is formed by slidably inserting the left and right overhanging amount adjusting tubes 23 and 24 into both ends of the lower connecting tube 20 to form a telescopic tube structure. 24 is provided with a fixing device 28 that can fix the 24 at an arbitrary telescopic position.

On the other hand, as shown in FIG.
A pair of left and right struts 29, 30 and left and right struts 2, which extend in the vertical direction at predetermined intervals in the width direction and whose upper ends are connected to the right end of the scaffold plate 11 via the folding connection mechanism 13
A lower connecting pipe 31 connecting the lower ends of 9, 30 to each other;
Upper connecting pipe 30 for connecting the upper ends of right supports 29 and 30 to each other
a, the upper end is a middle part of the left and right columns 29, 30 and is pivotally supported on the outer surface thereof, and the lower end extends downward from the lower end surfaces of the left and right columns 29, 30 to form a floor. The surface 14 includes left and right auxiliary columns 32 and 33 that can be in contact with the ground, and left and right extension amount adjusting tubes 34 and 35 that regulate the width of the left and right auxiliary columns 32 and 33 in the width direction. Note that, in the present embodiment, the upper connecting pipe 30a is formed by the right end of the scaffold plate 11.

As shown in FIG. 1, each of the left and right auxiliary columns 32, 33 has a telescopic tube structure in which a telescopic leg 37 is slidably inserted into a swing leg 36 in a nested manner. In addition, a fixing device 38 capable of fixing the telescopic leg 37 at an arbitrary telescopic position is provided below the inner surface of the swing leg 36. The telescopic tube structure is formed by slidably inserting left and right overhanging amount adjusting tubes 34 and 35 into both ends of the lower connecting tube 31 to form a telescopic tube structure. It is provided with a fixing device 39 that can fix 34, 35 at any telescopic position.

The present invention relates to a working scaffold A having the above-described structure, in which the lifting frame 15 and the opening frame 16 are described in detail with reference to FIGS. The cross sections of the left and right columns 17, 18, 29, and 30 are formed into U-shaped cross sections that open laterally, and the cross sections of the left and right auxiliary columns 21, 22, 32, and 33 are described above. When the left and right overhang amount adjustment tubes 23, 24, 34, 35 are at the maximum retracted position,
Left and right auxiliary columns 21, 22, 32 and 33 are left and right columns 1
It is characterized in that it is fitted into 7, 18, 29, 30.

Hereinafter, the relationship between the left support column 17 of the lift frame 15 and the left auxiliary support column 21 will be described. The relationship between the right support column 18 and the right auxiliary support column 22 of the lifting frame 15 and the opening frame 1
6 left and right supports 29 and 30 and left and right auxiliary supports 32 and 33
The same applies to the relationship, so that the description is omitted. As shown in FIGS. 1 and 5 to 8, the left support 17 is
It consists of a channel member that opens laterally. That is, the left support column 17 is formed of a bottom plate 40 and a pair of side plates 41 and 42 extending laterally from both side edges thereof, and has a storage space 43 having a width W and a depth D therein. Are formed.

On the other hand, as shown in FIGS. 7 and 8, the left auxiliary column 21 has a telescopic leg 26 forming an inner tube inserted slidably into a swinging leg 25 forming an outer tube. Oscillating leg 25 and telescopic leg 26
Both have a hollow rectangular cross section. And the swing leg 25
Has a width w that is slightly smaller than the width W of the storage space 43 of the left support column 17 and the storage space 43 described above.
Has a height H of about 4/3 of the depth D of Note that the depth D and the height H can be set to another ratio, for example, equal. Therefore, as shown in FIGS. 4 and 6, by laterally moving the left auxiliary column 21, the left auxiliary column 21 can be almost completely fitted into the storage space 43.

As shown in FIGS. 1, 5 and 6,
The upper end of the left auxiliary column 21 is fitted into the left column 17 and is pivotally supported by the left column 17 by a pivot 44. On the other hand, the left support 17 connected to the lower connecting pipe 20
A rectangular through hole 45 is formed at the lower end of the fixing device 27, and the area of the through hole 45 is sufficiently larger than the projection area of the fixing device 27 as viewed from the side.

As shown in FIG. 9, in the present embodiment, the opening surface 47 of the distal end opening portion 46 of the left overhanging amount adjusting tube 23 is adjusted to the inclination angle of the left auxiliary column 21 at the maximum expanded position. The bottom plate 48 is formed with a notch opening 50 for allowing a connecting ear piece 49 to be described later to swing. Further, pivot insertion holes 51 and 52 are formed on both side walls of the distal end opening 46.

On the other hand, at the lower end of the swinging leg 25 of the left auxiliary column 21, a pair of connecting ear pieces 49 is projected from a surface 53 corresponding to the distal end opening 46 of the left overhanging amount adjusting tube 23. In both connecting ear pieces 49, a vertically long through-hole 54 extending parallel to the surface 53 is formed in a front view in FIG.

Then, the above-described connecting ear piece 49 is inserted into the distal end opening 46 of the left overhanging amount adjusting tube 23, and
With the lower part of the through hole 54 aligned with the pivot insertion holes 51 and 52, the pivot 55 is passed through the pivot insertion hole 51, the through hole 54 of both connecting ear pieces 49, and the pivot insertion hole 52, and then the tip screw is screwed. By screwing a nut 56 onto the portion, the distal end opening 46 of the left overhanging amount adjusting tube 23 is pivotally connected to the lower end of the swing leg 25.

With the above configuration, as shown in FIGS. 1 and 5, the left and right auxiliary columns 21, 2
When the fixing device 28 is loosened from the state where the leg 2 is opened, and the left and right auxiliary columns 21 and 22 swing around the pivot 44 and move toward the left and right columns 17 and 18, the left and right overhanging amounts are obtained. The adjusting tubes 23 and 24 are gradually fitted into the lower connecting tube 20,
In conjunction with this fitting, the left and right auxiliary columns 21 and 22 are stored in the storage space 43 of the left and right columns 17 and 18 from the upper end to the lower end. And also in the last stage, the fixing device 27 passes through the through hole 45 and the left and right columns 1
Because it advances inside 7, 18, the left and right auxiliary columns 21,
The lower end of 22 is also completely stored in the storage space 43, and can assume the maximum retracted position shown in FIGS.

Although not shown, the left and right support columns 32 and 33 in the opening frame 16 can be similarly set to the maximum retracted position. In FIG. 4, the telescopic legs 26 of the left and right auxiliary columns 21 and 22 are also fitted into the swing legs 25.

As described above, in the present embodiment, the left and right auxiliary columns 21, 22, 32, 33 at the maximum retracted position.
Are left and right columns 17, 18, 29, 3 having a U-shaped cross section.
Since it is possible to fit the entirety into the inside of the frame 0, it is possible to improve the storage and transportability of the lifting frame 15, the opening frame 16, and the work scaffold A. Also, in appearance,
Left and right auxiliary columns 21, 22, 32 and 33 are left and right columns 1
Since it does not protrude greatly from 7, 18, 29, 30 to the side, a compact impression can be given to the user and the purchaser.

In the present embodiment, as shown in FIGS. 1, 7 to 9, the left and right auxiliary columns 21, 22, 32, 3
3 is a beveled inclined surface 57 on both outer corners,
58, the left and right auxiliary columns can be formed in a more compact shape as compared with the case where the horizontal cross section is a perfect rectangular cross section.
6 and the work scaffold A can be made compact in appearance. In addition, since the acute angle portion can be reduced, the safety at the time of transporting the elevating frame 15, the opening frame 16, and the work scaffolding base A can be improved.

Other configurations in the illustrated embodiment will be described. As shown in FIGS. 1, 3 to 6, both ends of the lower connecting pipes 20, 31 and the left and right columns 17, 18, 2
The connection with 9 and 30 is reinforced by a reinforcing bracket 59.

Further, in the work scaffold A shown in FIG. 1, the fixing devices 27 and 38 are described in
It has a configuration similar to that of the fixing device disclosed in Japanese Patent No. 177460. That is, rack grooves are provided on the outer surfaces of the telescopic legs 26, 37, and the fixing devices 27,
The rack teeth provided in the bracket 38 and urged in the engagement direction by a spring are detachably engaged. Therefore, the height from the floor surface 14 to the scaffold plate 11 is adjusted by engaging the rack teeth with the rack grooves by the fixing devices 27 and 38 after extending the telescopic legs 26 and 37 by an arbitrary length. Can be.

The fixing devices 28 and 39 shown in FIG.
It has the same configuration as the fixing device disclosed by the present applicant in Japanese Patent Application Laid-Open No. Hei 9-177460. That is, in FIG. 3, a leaf spring is bent and stored in a U-shape inside the ends of the left and right overhang amount adjusting tubes 23 and 24, and a convex portion is formed at one end of the leaf spring. The projections are engaged with holes formed in the left and right overhanging amount adjusting tubes 23 and 24, respectively.
A positioning pin 60 is attached to the other end of the leaf spring, and a positioning hole 61 provided on the side wall of the lower connecting tube 20 and through holes provided in the left and right overhang amount adjusting tubes 23 and 24 can be inserted. The lower connecting pipe 20 is provided with positioning holes 61 and 62.

With this configuration, the distal end of the positioning pin 60 is pushed into the inside of the lower connecting pipe 20 to release the fitting state between the positioning pin 60, the positioning hole 61 and the through hole, so that the left and right overhanging amounts are obtained. The adjusting tubes 23 and 24 can be slid freely. Also,
When the positioning pins 60 come to the positions of the positioning holes 62 by sliding the left and right overhanging amount adjusting tubes 23 and 24, the positioning pins 60, the positioning holes 62 and the through holes are fitted again, and the left and right overhangs. The amount adjustment tubes 23 and 24 are prevented from sliding with respect to the lower connecting tube 20 so that the left and right overhang amount adjustment tubes 23 and 24 can adjust the amount of protrusion to the left and right outside. In the present embodiment, since the positioning holes 61 and 62 are provided at two locations on the left and right, the left and right overhanging amount adjusting tubes 23 and 24 can be restricted to two positions.

As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the configuration described in the above embodiments, and is described in the claims. The present invention also includes other embodiments and modifications that can be considered within the scope of the matters.

[0033]

According to the lifting frame and the opening frame having the opening leg function according to the first to fourth aspects, the auxiliary column can be entirely fitted into the column having the U-shaped cross section at the maximum retracted position. In addition, it is possible to improve the storage and transportability of a lifting frame, an opening frame, and a work scaffold using the same. In addition, since the auxiliary struts do not protrude significantly laterally from the struts, a compact impression can be given to the user and the purchaser.

In the lifting frame and the opening frame having the leg opening function according to the second and fourth aspects, a fixing device for fixing the swinging leg and the telescopic leg constituting the auxiliary column can be fitted into the lower end of the column. A through-hole is formed, and at the maximum retracted position, the fixing device can advance inside the support through the through-hole, so that the elevating frame, the opening frame, Can be made into a compact shape, and the storage and transportability thereof can be further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a working scaffold provided with an elevating frame having an open leg function and an opening frame according to an embodiment of the present invention.

FIG. 2 is a front view of a working scaffold including an elevating frame having an opening function and an opening frame according to an embodiment of the present invention.

FIG. 3 is a side view of the working scaffolding provided with an elevating frame and an opening frame having a leg opening function according to an embodiment of the present invention at a maximum expanded position.

FIG. 4 is a side view at a maximum retracted position of a work scaffold having an elevating frame having an opening function and an opening frame according to an embodiment of the present invention.

FIG. 5 is an enlarged front sectional view of a main part of a lifting frame at a maximum expanding position.

FIG. 6 is an enlarged front sectional view of a main part of a lifting frame at a maximum retracted position.

FIG. 7 is a sectional view taken along line II of FIG. 5;

8 is a sectional view taken along line II-II in FIG.

FIG. 9 is an enlarged exploded perspective view of a main part of a lifting frame at a maximum expanding position.

FIG. 10 is a perspective view of a conventional work scaffold having an opening frame having a leg opening function.

[Explanation of symbols]

Reference Signs List A Work platform D Storage space depth H Swing leg height W Storage space width w Swing leg width 10 Work floor surface 11 Scaffolding board 12 Folding connection mechanism 13 Folding connection mechanism 14 Floor 15 Lifting frame Reference Signs List 16 Opening frame 17 Left support 18 Right support 19 Stepping bar 20 Lower connecting pipe 21 Left auxiliary support 22 Right auxiliary support 23 Left overhang amount adjustment tube 24 Right overhang amount adjustment tube 25 Swing leg 26 Telescopic leg 27 Fixing device 28 Fixing device 29 Left support 30 Right support 30a Upper connecting pipe 31 Lower connecting pipe 32 Left auxiliary support 33 Right auxiliary support 34 Left overhang adjustment pipe 35 Right overhang adjustment pipe 36 Swing leg 37 Telescopic leg 38 Fixing device 39 Fixing device 40 Bottom plate 41 Side plate 42 Side plate 43 Storage space 44 Axis 45 Through hole 46 Tip opening 47 Opening surface 48 Bottom plate 49 Connecting ear piece 50 Notch opening 51 Pivot Communication holes 52 pivot through hole 53 surface 54 through hole 55 pivot 56 nut 57 chamfered inclined surfaces 58 beveled inclined surface 59 the reinforcing bracket 60 positioning pin 61 positioning holes 62 positioning holes

Claims (4)

[Claims] 1. A pair of struts extending in the vertical direction at intervals in the width direction, a plurality of treads suspended laterally at intervals between the struts, and a lower connection for connecting lower ends of the struts. A pipe, an auxiliary column whose upper end is swingably pivoted to a middle portion of the column and whose lower end extends below the lower end surface of the column and can be installed on the floor surface; and the auxiliary column and the lower portion. An elevating frame having an open leg function, which is formed to be stretchable between the connecting pipe and an extension amount adjusting pipe that regulates an extension amount of the auxiliary support in the width direction, wherein a lateral cross section of the support is The auxiliary column is formed in a U-shaped cross section that opens toward the side, and the cross section of the auxiliary column is formed into a shape that can be fitted into the U-shaped cross section, and when the overhang amount adjustment tube is at the maximum retracted position, the auxiliary column is The leg opening function characterized by being inserted into the support post Lifting frame for. 2. The swinging leg according to claim 1, wherein the auxiliary pillar is swingably supported on an outer surface of the pillar, a telescopic leg is slidably fitted into the swinging leg, and an inner surface of the swinging leg. A fixing device attached to a lower portion and capable of fixing the telescopic leg to the swinging leg; a through-hole through which the fixing device can be fitted is formed at a lower end portion of the support post; The lifting frame with a leg opening function according to claim 1, wherein a device is advanced into the inside of the column through the through hole. 3. A pair of columns extending in the vertical direction with an interval in the width direction, an upper and lower connecting pipe connecting the upper and lower ends of the column, and an upper end swingable to a middle part of the column. An auxiliary column, which is pivotally supported and whose lower end extends below the lower end surface of the column, and which can be installed on the floor surface, and which is opened and contractible between the auxiliary column and the lower connecting pipe, In an opening frame having a leg-opening function constituted by an overhang amount adjusting tube for regulating an overhang amount of the support in the width direction, a cross section of the support is formed into a U-shaped cross section opened laterally, and The auxiliary leg is characterized in that a cross section of the auxiliary column is formed so as to fit into the U-shaped cross section, and the auxiliary column is inserted into the column when the overhang amount adjusting tube is at the maximum retracted position. Opening frame with function. 4. The swinging leg, wherein the auxiliary strut is swingably supported on an outer surface of the strut, a telescopic leg is slidably fitted into the swinging leg, and an inner surface of the swinging leg. A fixing device attached to a lower portion and capable of fixing the telescopic leg to the swinging leg; a through-hole through which the fixing device can be fitted is formed at a lower end portion of the support post; 4. The open frame with a leg opening function according to claim 3, wherein a device extends inside the support through the through hole.