Height-adjustable leg structure

Abstract

To provide a height-adjustable leg structure that allows easy height adjustment work. [Solution] Legs 20-23 arranged at the four corners of a frame-shaped member 01 have base legs 24 and sliding legs 25. A long metal plate beam member 26 is provided between the horizontal frame 3 and the legs, with one end connected to the sliding legs and the other end detachably attached to the horizontal frame. The base leg has guide slots 30 formed in the vertical direction, and the sliding legs have their lower ends slidably connected to the guide slots. One end of the beam member is connected to the sliding legs via hex bolts 28a and the other end is detachably joined to the horizontal frame via square bolts 29a. The guide slots have a linear hole 30a and a first inclined hole 30b at the lower end of the linear hole into which the hex bolt 28a connected to the sliding legs is fitted and locked, and a second inclined hole 30c at the upper end into which the hex bolt is fitted and locked.

Description

[Technical Field]

[0001] The present invention relates to a leg structure for a simple bed or the like used as a bed for disaster victims, for example, in the event of a disaster, and in particular to a height-adjustable leg structure. [Background technology]

[0002] As this type of height-adjustable leg structure, for example, the one described in Patent Document 1 below is known.

[0003] This height-adjustable leg structure is applied to a platform unit in which multiple platforms are laid on the floor of a bathroom washing area to eliminate the step between the bathroom washing area floor and the entrance / exit.The platform has a rectangular surface material, a similarly rectangular board material, a leg attachment material, and a leg body.

[0004] The leg body is composed of a leg member having a height adjustment member and a rubber seat. The leg attachment member has a rectangular thin attachment portion and a screw shaft portion.

[0005] The upper surface of a leg attachment part at any position on the plate has a cutout of the same shape as the attachment part, and below the cutout is a circular through-hole with an inner diameter larger than the shank diameter of the screw shank of the leg attachment part. The depth of the cutout in the through-hole is the same as the thickness of the attachment part, and the screw shank of the leg attachment part is inserted into the through-hole, and the attachment part of the leg attachment material is aligned with the cutout and attached by adhesive or the like, thereby fixing the leg attachment material to the plate.

[0006] The height adjustment member has a screw hole at its upper end that screws into the screw shaft of the leg attachment member, and a screw hole at its lower end that attaches the leg member. The height adjustment member can be screwed in and out of the leg attachment member freely, and at the same time, it can fit seamlessly into and out of the through-hole in the plate material.

[0007] The height of the platform can be adjusted by rotating the height adjusting member forward or backward to change the amount of threading of the leg attachment member. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2004-238887 A (Figs. 2 and 3) Summary of the Invention [Problem to be solved by the invention]

[0009] In the conventional height-adjustable leg structure, as mentioned above, the height of the platform is adjusted by rotating the height adjustment member forward and backward to change the screw length of the leg attachment member. Therefore, to prevent the platform from wobbling, the height of all of the legs must be made uniform. To achieve this, the forward and backward rotation positions (rotation angles) of each height adjustment member must be precisely adjusted, i.e., fine adjustments must be made. This makes the height adjustment process complicated, resulting in a decrease in the efficiency of the height adjustment process.

[0010] The present invention was devised in consideration of the technical problems with the conventional screw-type height-adjustable leg structure, and aims to provide a height-adjustable leg structure that allows the height position of the leg to be adjusted in a uniform, multi-stage manner, thereby making it possible to easily perform height adjustment work and to stably support the supported object. [Means for solving the problem]

[0011] The invention described in claim 1 of the present application is a leg structure arranged on at least both the left and right sides of a supported body and capable of adjusting its height, leg The unit has a base leg whose lower end is placed on a floor surface and a slide leg that is slidable in the up and down direction relative to the base leg, an inclined beam member disposed between the supported object and the leg portion, one end of which is connected to the slide leg via the base leg, and the other end of which is detachably attached to the supported object; The base leg has a guide slot formed in the vertical direction at approximately the center in the width direction, The slide leg has a lower end slidably provided in the guide slot of the base leg via a connecting portion, and has a holding portion at an upper end on which the supported object is placed and held; one end of the beam member is connected to the slide leg via the connecting portion, and the other end is detachably connected to the supported body via a joining portion; The long guide hole of the base leg is characterized by having a linear hole portion formed in a straight line along the longitudinal direction of the base leg, a first inclined hole portion provided at the lower end of the linear hole portion and into which the connecting portion fits and engages when connected to the sliding leg, and a second inclined hole portion provided at the upper end of the linear hole portion and into which the connecting portion fits and engages when connected to the sliding leg. [Effects of the Invention]

[0012] According to the present invention, the height position of the legs can be adjusted in a uniform, multi-stage manner, which simplifies the height adjustment work, improves the efficiency of the height adjustment work, and makes it possible to stably support the supported object with simple work. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view of a ball-proof fence to which the height-adjustable leg structure of the present invention is applied. [Figure 2] FIG. 2 is a plan view of the ball-proof fence used in the present embodiment. [Figure 3] 1A and 1B show a base leg used in this embodiment, in which FIG. 1A is a front view of the base leg, and FIG. 1B is a left side view of the base leg. [Figure 4] 1A and 1B show a sliding leg used in the present embodiment, in which FIG. 1A is a front view of the sliding leg, and FIG. 1B is a right side view of the sliding leg. [Figure 5] 1A, 1B, and 1C show a beam member used in the present embodiment, in which FIG. 1A is a front view of the beam member, FIG. 1B is a right side view of the beam member, and FIG. 1C is a rear view of the beam member. [Figure 6]1A is a front view showing a root angle bolt used in this embodiment, and FIG. 1B is a front view of a wing nut that is screwed onto the root angle bolt. [Figure 7] 10(a) shows the frame-shaped member in a low position, and FIG. 10(b) is an enlarged view showing the right side of FIG. [Figure 8] 10(a) shows the state in which the frame-shaped member is in a low position and the other end of the beam member is removed from the horizontal frame, and FIG. 10(b) is an enlarged view showing the area on the right side of FIG. [Figure 9] 10(a) shows the state in which the frame-shaped member is lifted and the slide legs are slightly slid upward from the base legs, and FIG. 10(b) is an enlarged view showing the right side of FIG. [Figure 10] 10A shows the state in which the frame member is lifted to the maximum and the slide legs are slid to the maximum upper position relative to the base legs, and FIG. 10B is an enlarged view showing the right side of FIG. [Figure 11] 10(a) shows the state in which the other end of the beam member is connected to the horizontal frame at the uppermost position of the frame-shaped member, and FIG. 10(b) is an enlarged view showing the right-hand side portion of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Below is shown an example of the height-adjustable leg structure of the present invention, which is applied to a ball-proof fence used to protect against balls in regular ball games in gymnasiums, etc., and which can be adapted to a bed by knocking down the frame-shaped members and rearranging the legs in the event of a disaster, etc.

[0015] An invention that uses a ball-proof fence as a bed in the event of a disaster is described in Patent Gazette No. 6924457, which was previously filed and patented by the applicant, and this invention applies this to the leg structure at the four corners of the bed.

[0016] FIG. 1 is a front view of a ball-proof fence to which the height-adjustable leg structure of the present invention is applied, and FIG. 2 is a plan view of the ball-proof fence.

[0017] First, the structure of the ball-proof fence will be briefly explained with reference to FIGS. 1 and 2.

[0018] As shown in FIGS. 1 and 2 , a ball-proof fence (ball-proof net) used in this embodiment, for example, to be installed in a gymnasium, includes a pair of vertical frames 1, 2 arranged on both the left and right sides; a lower horizontal frame 3 and an upper horizontal frame 4 arranged and connected vertically between the vertical frames 1, 2; a pair of left and right leg members 6, 7 arranged at the lower ends 1a, 2a of the left and right vertical frames 1, 2, respectively, and divided front and rear around each vertical frame 1, 2; and a net 8 made of synthetic resin, which is a sheet member stretched inside a frame member 01 formed by the connected vertical and horizontal frames 1 to 4. The frame member 01 and the net 8 form a supported structure. The sheet member may be a flexible synthetic resin sheet, instead of a net.

[0019] Both vertical frames 1, 2 are formed of steel pipes, for example, with a diameter of about 49 mm and a height of about 87 cm, and have insertion holes 9, 10 formed therethrough in the axial direction, with open ends formed at the tips of lower end portions 1a, 2a and upper end portions 1b, 2b of each insertion hole 9, 10. Furthermore, both vertical frames 1, 2 have positioning holes 1c, 2c formed therethrough in the radial direction at predetermined positions of each upper end portion 1b, 2b, into which positioning bolts (not shown) are inserted, which will be described later.

[0020] Furthermore, a slit of a predetermined length is formed in each of the upper end portions 1b, 2b along the axial direction (downward) from the edge of the opening end of each insertion hole 9, 10. A restricting piece, which is a protrusion of a rotation-preventing member (not shown), can be fitted into each of these slits from above.

[0021] Both horizontal frames 3, 4 are formed from steel pipes having the same diameter of approximately 49 mm and a horizontal length of approximately 2 m, and both ends are connected by welding to the opposing sides of the upper and lower ends of the vertical frames 1, 2, avoiding the insertion holes 9, 10. These connected horizontal frames 3, 4 and vertical frames 1, 2 form the rectangular frame member 01 that is 87 cm long and 2 m wide.

[0022] As shown in FIG. 2, each of the insertion holes 9, 10 has a circular cross section, and partition plates 11, 12 are fixedly disposed in the axial direction from the opening ends of the upper and lower ends 1a-2b. Each of the partition plates 11, 12 is made of an iron-based metal plate and is fixedly disposed so as to diametrically cross the center of each of the insertion holes 9, 10. Therefore, each of the insertion holes 9, 10 is divided into two parts in the vertical direction, with the first divided hole 9a, 10a on one side and the second divided hole 9b, 10b on the other side each having a semicircular shape in plan view. Each of the partition plates 11, 12 is welded to the inner circumferential surface of each of the insertion holes 9, 10, and its longitudinal length is limited to a predetermined region of each of the lower ends 1a, 2a and the upper ends 1b, 2b.

[0023] As shown in Figure 2, each leg member 6, 7 has a pair of front and rear first leg portions 20, 21 and second leg portions 22, 23 that extend in the front-to-rear direction of each vertical frame 1, 2 perpendicular to the net 8 and are placed on the floor surface F of the gymnasium, and a pair of first and second shaft portions (not shown) that are provided at the opposing ends of the first leg portions 20, 21 and the opposing ends of the second leg portions 22, 23 and are removably inserted into the respective first dividing holes of the respective lower ends 1a, 2a.

[0024] The four legs, the first legs 20, 21 and the second legs 22, 23, are formed with the same structure as shown in Figures 3 and 4 described below, and therefore will be described with the same names and numbers. That is, the four legs 20, 21, 22, 23 each have a base leg 24 whose lower end is placed on the floor surface F, and a slide leg 25 that can slide up and down relative to the base leg 24.

[0025] A cap 27 is attached to the lower end of each base leg 24 of each of the legs 21 to 23 to prevent scratches and impacts on the floor surface F. Each cap 27 is made of rubber or synthetic resin and has a rectangular cup shape, and is detachably fitted onto the tip of each base leg 24 of each of the legs 20 to 23.

[0026] Between approximately the center of the longitudinal upper surface of each leg 20-23 and a predetermined position on the upper surface of the lower horizontal frame 3, a pair of reinforcing beam members 26 (four in total) are disposed in a V-shape. As shown in FIG. 2 and FIG. 5 (described later), these beam members 26 are formed elongated from an iron-based metal material, and one longitudinal end 26a is rotatably connected to the flat upper surface of each leg 20-23 by a hexagon bolt 28a and a nut 28b, which serve as a connecting part. Meanwhile, the other longitudinal end 26b is connected to the lower surface of the lower horizontal frame 3 by a hexagon bolt 29a and a wing nut 29b, which serve as a connecting part. Each of the beam members 26 firmly connects each of the legs 20-23 to the two horizontal frames 3, 4.

[0027] Each of the shafts is formed from an iron-based metal pipe, with its lower end extending vertically a predetermined length from the upper surface of the opposing end of each of the legs 20-23. Each of the shafts is joined to the upper surface of the opposing end of each of the legs 20-23 by welding. Each shaft has a semicircular cross section corresponding to the first divided holes 9a, 10a of each of the insertion holes 9, 10, with a cross-sectional area slightly smaller than that of the first divided holes 9a, 10a. The shafts are removably inserted into the first divided holes 9a, 10a in the axial direction. Each of the shafts has an upper opening closed by a semicircular cover (not shown) made of an iron-based metal plate. Each cover is fixed to the edge of the upper opening of each shaft by welding, thereby ensuring rigidity around the upper opening of each shaft.

[0028] Figure 3 shows a base leg used in this embodiment, (a) is a front view of the base leg, (b) is a left side view of the base leg, Figure 4 shows a sliding leg used in this embodiment, (a) is a front view of the sliding leg, (b) is a right side view of the sliding leg, Figure 5 shows a beam member used in this embodiment, (a) is a front view of the beam member, (b) is a right side view of the beam member, (c) is a back view of the beam member, Figure 6(a) is a front view of a root angle bolt used in this embodiment, (b) is a front view of a wing nut screwed onto the root angle bolt.

[0029] As shown in Figures 3(a) and (b), each of the four base legs 24 is formed in the shape of a long plate made of iron-based metal material, with a long guide hole 30 formed in the vertical direction at approximately the center of the width, and two first and second locking grooves 31, 32 cut out at the upper and lower positions of one side edge 24a on the beam member 26 side.

[0030] As shown in FIG. 3( a), the guide slot 30 includes a linear hole portion 30a extending vertically in a straight line, a first inclined hole portion 30b extending downward and to the right from one side edge 24a at the bottom of the linear hole portion 30a, and a second inclined hole portion 30c extending upward and to the right from one side edge 24a at the top of the linear hole portion 30a at the same inclination angle as the first inclined hole portion 30b. The linear hole portion 30a has a longitudinal length L that guides the sliding movement of the slide leg 25 via the hexagonal bolt 28a and determines the vertical height of the slide leg 25 relative to the base leg 24. The widthwise center line P of the linear hole portion 30a is positioned slightly offset toward one side edge 24a from the widthwise center line P1 of the base leg 24. The first inclined hole portion 30b has the same width and length as the straight hole portion 30a, an inclination angle θ of approximately 60° relative to the center line P, and is formed long toward the other side edge. On the other hand, the second inclined hole portion 30c has approximately the same inclination angle as the first inclined hole portion 30b, but is formed shorter in length than the first inclined hole portion 30b.

[0031] The lower first locking groove 31 is formed in an inclined rectangular shape (diamond shape) from one side edge 24a toward the first inclined hole portion 30b, and the upper second locking groove 32 is formed in an inclined rectangular shape (diamond shape) from one side edge 24a toward the second inclined hole portion 30c. In other words, the first and second locking grooves 31, 32 are set to the same inclination angle as the first and second inclined hole portions 30b, 30c, and are formed in diamond shapes of the same size, so that locking protrusions 33 (described later) of the beam member 26 are fitted into and locked in each locking groove 31, 32 from an oblique direction as appropriate.

[0032] As shown in Figures 4(a) and (b), the sliding leg 25 is made of an iron-based metal material and is formed in an approximately inverted L shape when viewed from the side.It has a leg main body 25a that is arranged in contact with the back surface of the base leg 24 and can slide up and down, and a holding portion 25b that extends approximately horizontally from the upper end of the leg main body 25a.

[0033] Leg body 25a is formed as a thick plate that is long in the vertical direction, with its length L1 set to be approximately the same as the length of base leg 24, and its lower end formed with a bolt insertion hole 25c through which shank 28c of hexagon bolt 28a is inserted. In addition, lightening holes 25d are formed in the surface of leg body 25a along the vertical direction to reduce weight.

[0034] The retaining portion 25b is formed to protrude upward from the leg main body 25a, and has a retaining groove 25e formed on its upper surface along the longitudinal direction, on which the lower part of each of the horizontal frames 3, 4 is placed and held. The retaining groove 25e is formed to have a substantially semicircular cross section in order to hold the lower part of the cylindrical horizontal frames 3, 4.

[0035] 5(a) to 5(c), beam member 26 has a first bolt insertion hole 26c formed at one longitudinal end 26a (the lower end in the figure) through which a shank 28c of hexagon bolt 28a is inserted, while a second bolt insertion hole 26d formed at the other end 26b (the upper end in the figure) through which a cubic anti-rotation portion 29e (described later) of square bolt 29a is fitted. This second bolt insertion hole 26d is formed in a square shape rather than a circular shape, and anti-rotation portion 29e is fitted to restrict rotation of square bolt 29a, allowing it to be tightened to the horizontal frames 3, 4 by rotation of wing nuts 29b.

[0036] Furthermore, a locking protrusion 33 is integrally formed on the outer surface of one end 26a of the beam member 26. The locking protrusion 33 is adapted to be fitted into and locked in the first locking groove 31 and the second locking groove 32 of the base leg 24 from an oblique direction. The locking protrusion 33 is formed in a similar shape to match the diamond shape of each locking groove 31, 32, and is set at an inclination angle of approximately 60° to match the inclination angle θ of the locking grooves 31, 32.

[0037] Furthermore, as will be described later, when the frame member 01 and the net 8 are used as a bed, one end 26a of the beam member 26 is connected to the elongated guide hole 30 of the base leg 24 and the sliding leg 25 by a hexagonal bolt 28a and a nut 28b, but this connection is not firmly tightened by the hexagonal bolt 28a and the nut 28b, but is loosely connected. This allows one end 26a of the beam member 26 and the sliding leg 25 to always slide up and down via the elongated guide hole 30 of the base leg 24.

[0038] The square bolt 29a and wing nut 29b are configured as shown in Figures 6(a) and 6(b), with a cubic anti-rotation portion 29e provided at the joint between the head 29c of the square bolt 29a and the shank 29d (male thread), and as described above, this anti-rotation portion 29e is adapted to fit into the second bolt insertion hole 26d in the other end 26b of the beam member 26. The wing nut 29b has an internally threaded hole 29f that screws onto the shank 29d of the square bolt 29a. Furthermore, as shown in Figure 8 and other figures, the horizontal frames 3 and 4 are formed with circular bolt holes 3a and 4a through which the shank 29d of the square bolt 29a is inserted. [Effect of the ball-proof fence of this embodiment when used as a bed] When the ball-proof fence of this embodiment configured as described above is used as a normal ball-proof fence, for example, in a gymnasium, a net 8 is stretched inside a frame member 01 that is previously made up of vertical frames 1 and 2 and horizontal frames 3 and 4, as shown in Figure 1. The frame member 01 is supported in an upright position on the floor F by inserting the shafts of each pair of front and rear leg members 6 and 7 into the first and second dividing holes 9a, 10a, 9b, 10b on the lower end portions 1a, 2a of the vertical frames 1 and 2.

[0039] Here, one end 26a of each beam member 26 is connected to the legs 20-23 of the leg members 6, 7 with a hex bolt 29a and a nut 29b, respectively, while the other end 26b is fixed to the underside of both ends of the lower horizontal frame 3 with a hex bolt 29a and a wing nut 29b. As a result, each beam member 26 spans between each leg member 6, 7 and the lower horizontal frame 3 in a V-shape, increasing the connection rigidity between the two. Therefore, the entire frame member 01 has high connection rigidity between each leg member 6, 7 and the lower horizontal frame 3 due to each beam member 26, increasing the overall rigidity and allowing it to maintain a stable upright state on the floor F. Therefore, ball-proof fences can be used alone or in multiple rows within a gymnasium.

[0040] When using this ball-proof fence as a bed for victims in the event of a disaster, first, the ball-proof net is tilted in one direction from the use position shown in Figure 1 and the shaft portions of the legs 22, 23 on one side are pulled out from the first dividing holes 9a, 10a of the lower end portions 1a, 2a of each vertical frame 1, 2.

[0041] Thereafter, the extracted legs 22, 23 on one side are grasped and moved toward the upper end portions 1b, 2b of the vertical frames 1, 2, and the shafts on one side are inserted all the way into the second split holes 9b, 10b. This causes the legs 22, 23 and shafts to be attached to the upper end portions 1b, 2b of the vertical frames 1, 2, respectively.

[0042] Next, when the frame-shaped member 01 is returned to a horizontal position, the frame-shaped member 01 is supported at its four corners by the longitudinal tips (caps 27) of the base legs 24 of the four legs 20, 21, 22, and 23 abutting against the floor surface F, making it possible to use it as a bed.

[0043] At this time, one end 26a of each beam member 26 is rotatably connected to the legs 20 to 23 in advance, and the other end 26b is connected and fixed to a predetermined position on the upper horizontal frame 4 by tightening a square bolt 29a and a wing nut 29b, respectively, and the hexagon bolts 28a on the one end 26a side are each slightly tightened. Therefore, the frame-shaped member 01 is stably and firmly supported by the legs 20 to 23 via the beam members 26, and can be effectively used as a stable bed.

[0044] Figures 7 to 11 show the procedure for adjusting the height positions of the frame member 01 and the net 8 (bed) via the leg members, where Figure 7(a) shows the frame member in a low position, (b) is an enlarged view of the right-hand portion of (a), Figure 8(a) shows the frame member in a low position with the other end of the beam member detached from the horizontal frame, (b) is an enlarged view of the right-hand portion of (a), Figure 9(a) shows the frame member in a lifted position and the sliding legs slid slightly upward from the base legs, (b) is an enlarged view of the right-hand portion of (a), Figure 10(a) shows the frame member in a maximum lifted position with the sliding legs slid to the maximum upper position relative to the base legs, (b) is an enlarged view of the right-hand portion of (a), and Figure 11(a) shows the frame member in a maximum upper position with the other end of the beam member connected to the horizontal frame, (b) is an enlarged view of the right-hand portion of (a).

[0045] When the ball-proof net is used as a bed, the vertical height of the frame member 01 can be adjusted via the four legs 20 to 23. Although Figs. 7 to 11 illustrate the two left and right legs 20, 22, the other two left and right legs 21, 23 have the same function.

[0046] That is, for example, when the frame member 01 is adjusted from its lowest position to its highest position, at this lowest position, as shown in Figures 7(a) and 7(b), the slide legs 25 are moved to their lowest positions relative to the left and right base legs 24, and one end 26a of the beam member 26 is positioned in the first inclined hole portion 30b of the guide slot 30 of the base leg 24 via a hexagonal bolt 28a and a nut 28b. Also, the locking protrusion 33 of the beam member 26 is fitted into and locked into the first locking groove 31 of the base leg 24 from an oblique direction.

[0047] In this state, the locking projection 33 at one end 26a of the beam member 26 is securely fitted and locked obliquely into the first locking groove 31 of the base leg 24, and at the other end 26b, the wing nut 29b is tightly fastened to the root bolt 29a, so that the other end 26b is firmly connected to the horizontal frame 3. Therefore, the frame member 01 is stably and securely supported at the lowest position by the four legs 20 to 23. The height of the lowest frame member 01 is set to approximately 35 cm from the floor F.

[0048] Next, to adjust the frame member 01 from this low position to a higher position, as shown in Figures 8(a) and 8(b), first, release the hexagonal bolt 29a and the wing nut 29b, remove the other end 26b of the beam member 26 from the horizontal frame 3, and allow the sliding leg 25 to move up and down. In other words, because the hexagonal bolt 28a and the nut 28b are always screwed in a loose state, the base leg 24, the one end 26a of the beam member 26, and the sliding leg 25 are not tightly connected. Therefore, the sliding leg 25 is allowed to slide up and down. Furthermore, if the beam member 26 is slightly lifted in this state, the locking protrusion 33 comes out of the first locking groove 31, releasing the locking state with the base leg 24. Therefore, the sliding leg 25 becomes movable relative to the base leg 24.

[0049] 9(a) and 9(b), the frame-shaped member 01 (horizontal frame 3) is held and each sliding leg 25 is lifted upward together. At this time, each sliding leg 25 moves upward while the hexagonal bolts 28a and nuts 28b are guided by the linear hole portions 30a of the guide elongated holes 30 of the base leg 24, and the entire sliding leg 25 slides upward relative to the base leg 24. At this time, the linear hole portions 30a are biased in the width direction from the center line P1 in the width direction of the base leg 24, so that the sliding legs 25 move upward in a manner that is closer to the inside in the drawings.

[0050] 10(a) and 10(b), as each sliding leg 25 slides upward, when the hexagonal bolt 28a and nut 28b reach the second inclined hole portion 30c, which is the upper edge of the guide elongated hole 30, the shaft portion 28c of the hexagonal bolt 28a enters the second inclined hole portion 30c, preventing further upward movement and restricting the maximum movement position of each sliding leg 25. In other words, each sliding leg 25 is in a maximally extended state.

[0051] 11(a) and 11(b), one end 26a of each beam member 26 is held and positioned, and the shaft 28c of the hexagon bolt 28a is fitted obliquely into the second inclined hole 30c, while the locking protrusion 33 of the beam member 26 is fitted obliquely into the second locking groove 32 to be locked. After that, the second bolt insertion hole 26d of the other end 26b of the beam member 26 is aligned with the bolt hole 3a of the horizontal frame 3, and the shaft 29d of the hexagon bolt 29a is inserted through the second bolt insertion hole 26d and the bolt hole 3a of the horizontal frame 3, and then tightened with a wing nut 29b.

[0052] As a result, each slide leg 25 is firmly joined to and positioned at a high position relative to the base leg 24. Therefore, the frame member 01 is stably and reliably supported at a high position by the four legs 20 to 23. The height of the frame member 01 from the floor F is approximately 50 cm.

[0053] On the other hand, if it is desired to adjust the frame member 01 to the lowest position described above, the procedure is reversed. That is, the root bolt 29a and wing nut 29b are removed to release the connection of the other end 26b of the beam member 26 to the horizontal frame 3. Then, the hex bolt 28a is used to allow the sliding leg 25 to slide relative to the base leg 24. That is, when the other end 26b is removed and lifted diagonally, the locking protrusion 33 comes out of the second locking groove 32, and at the same time, the hex bolt 28a comes out of the second inclined hole portion 30c of the guide elongated hole 30. This releases the respective engagements and locks, allowing the sliding leg 25 to slide.

[0054] Therefore, while holding the frame-shaped member 01, each sliding leg 25 is slid downward relative to the base leg 24 via the hexagonal bolt 28a and the elongated guide hole 30. As a result, the hexagonal bolt 28a enters the first inclined hole 30b of the elongated guide hole 30, and the locking protrusion 33 engages and locks into the first locking groove 31. This restricts the sliding leg 25 from further downward movement, and the sliding leg 25 is positioned and held at its lowest position by the engagement and locking between the hexagonal bolt 28a and the first inclined hole 30b, and between the locking protrusion 33 and the first locking groove 31. In this state, the other end 26b of the beam member 26 is coupled and fixed to the horizontal frame 3 with the square bolt 29a and the wing nut 29b. Therefore, the frame-shaped member 01 is stably and reliably held at the lowest position by the legs 20 to 23.

[0055] As described above, according to this embodiment, the length of each of the legs 20 to 23 is adjusted in a uniform, multi-stage manner by adjusting the height of the legs 20 to 23 via a plurality of beam members 26, rather than by rotating the legs as in the prior art. This simplifies the height adjustment process. As a result, the efficiency of the height adjustment process for the frame member 01 is improved. In particular, since bed making and bed height adjustment, which are urgently required in the event of a disaster, can be performed efficiently in a short amount of time, this is not only highly convenient, but also allows for rapid response as an emergency bed for disaster victims.

[0056] Moreover, in this embodiment, as described above, when the shank 28c of the hexagon bolt 28a is fitted and locked into the first inclined hole 30b or the second inclined hole 30c, the locking projection 33 of the beam member 26 is fitted and locked into the corresponding first locking groove 31 or the second locking groove 32, thereby sufficiently increasing the stepwise engagement strength of the beam member 26 with the base leg 24. In other words, the locking mechanism of the beam member 26 with the base leg 24 is doubled, thereby obtaining a reliable and strong engagement force between the base leg 24 and the beam member 26 when adjusting the height of the sliding leg 25. As a result, the bed, which is a ball-stop net, can be stably supported on the floor surface F.

[0057] Furthermore, when using a ball-proof net that has been used as a bed as a normal ball-proof fence, the legs 20-23 on the upper end portions 1b, 2b of the vertical frames 1, 2 are grasped and the shafts are pulled out of the second dividing holes 9b, 10b to remove them. Then, the pulled-out shafts are inserted all the way back into the first dividing holes 9a, 10a on the lower end portions 1a, 2a of the original vertical frames 1, 2, and returned to their original positions, allowing for easy use as a ball-proof fence. Furthermore, when converting the normal ball-proof fence into a bed, or when converting the bed into a ball-proof fence, the frame-shaped member 01 can be tilted at a predetermined angle or completely tilted down.

[0058] The present invention is not limited to the configuration of the above-described embodiment. For example, the slide legs 25 and the like can be formed from aluminum alloy metal materials or resin materials other than iron-based metal materials, and such a change in material can reduce the overall weight.

[0059] In the above embodiment, the height positions of the sliding legs 25 are configured to have two levels, upper and lower, but it is also possible to change to a structure with three or four levels. Furthermore, in this embodiment, the height of the upper level of the legs 20 to 23 is 50 cm and the height of the lower level is 35 cm, but these heights can be changed as desired.

[0060] Furthermore, in the above embodiment, the hexagonal bolts 28a and nuts 28b are configured to be always in a relaxed state, but it is also possible to tighten them at the highest or lowest position of the legs 20 to 23, which increases the connection strength of each slide leg 25 to each base leg 24 and enables more stable support of the frame-shaped member 01.

[0061] In addition, in this embodiment, the leg structure is applied when converting a ball-proof net into a bed, but this is not limited to this, and it can also be applied to bathtubs and other structures as in conventional technology. [Explanation of symbols]

[0062] 01...Frame-shaped member (supported body) 1·2...Vertical frame 3·4…Horizontal frame 6·7…Leg member 8...Net (sheet material) 9·10...Through holes 20·21·22·23…legs 24...Base leg 25...Sliding legs 25a…Script font 25b...Holding part 25c...Bolt insertion hole 26...Beam member 26a...One end 26b...Other end 26c...First bolt insertion hole (connection hole) 26d...Second bolt insertion hole (connection hole) 28a...Hexagon bolt (connection part) 28b...Nut (connection part) 29a...Root angle bolt (joint) 29b…wing nut (joint part) 30...Guide slot 30a...Straight hole 30b...first inclined hole part 30c…Second inclined hole part 31...First locking groove 32...Second locking groove 33...Latching protrusion

Claims

1. A leg structure arranged on at least both the left and right sides of the supported body and capable of adjusting the height, The leg portion has a base leg whose lower end is placed on a floor surface and a slide leg that is slidable in the up and down direction relative to the base leg, an inclined beam member disposed between the supported object and the leg portion, one end of which is connected to the slide leg via the base leg, and the other end of which is detachably attached to the supported object; The base leg has a guide slot formed in the vertical direction at approximately the center in the width direction, The slide leg has a lower end slidably provided in the guide slot of the base leg via a connecting portion, and has a holding portion at an upper end on which the supported object is placed and held; one end of the beam member is connected to the slide leg via the connecting portion, and the other end is detachably connected to the supported body via a joining portion; A height-adjustable leg structure characterized in that the long guide hole of the base leg has a linear hole portion formed in a straight line along the longitudinal direction of the base leg, a first inclined hole portion provided at the lower end of the linear hole portion and into which the connecting portion fits and engages when connected to the sliding leg, and a second inclined hole portion provided at the upper end of the linear hole portion and into which the connecting portion fits and engages when connected to the sliding leg.

2. 2. The height-adjustable leg structure according to claim 1, The supported object has a rectangular frame member and a sheet member stretched inside the frame member, A height-adjustable leg structure characterized in that the base leg and sliding leg are respectively arranged at the four corners of the supported body, and the holding portion of the sliding leg places and holds the frame-shaped member.

3. 2. The height-adjustable leg structure according to claim 1, The base leg has at least two locking grooves, an upper groove and a lower groove, formed on one side edge of the beam member side, The beam member is formed of a metal material into a long, narrow plate shape, and has a locking protrusion on the one end side. A height-adjustable leg structure characterized in that when the connecting portion is fitted and engaged into the first inclined hole portion, the locking protrusion is fitted and engaged into the lower locking groove, and when the connecting portion is fitted and engaged into the second inclined hole portion, the locking protrusion is fitted and engaged into the upper locking groove.

4. 4. The height-adjustable leg structure according to claim 3, A height-adjustable leg structure characterized in that the inclination angles of the first inclined hole portion and the second inclined hole portion are set to the same angle as the inclination angles of each engaging groove of the corresponding base leg.

5. 2. The height-adjustable leg structure according to claim 1, The base legs are formed of metal plates that are long in the vertical direction, The slide leg is made of metal or resin and has a generally inverted L-shape in side view, and includes a thick plate-like leg body arranged on the rear side of the base leg so as to be slidable in the vertical direction, and the holding portion extends generally horizontally from the upper end of the leg body, The leg body has a bearing-shaped insertion hole formed at the lower end thereof, and the connecting portion is connected in a loose state to the bearing-shaped insertion hole. A height-adjustable leg structure, characterized in that the holding portion has a holding groove formed on its upper surface for placing and holding the supported object.

6. 2. The height-adjustable leg structure according to claim 1, The connecting portion is composed of a root angle bolt that is removably attached to an attachment hole formed through the supported body, and a wing nut that is screwed onto the shank of the root angle bolt, and when adjusting the extension length of the sliding leg, the wing nut is released from the root angle bolt, leaving one end of the beam member free.This height-adjustable leg structure is characterized by the above.

7. 6. The height-adjustable leg structure according to claim 5, the connecting portion is composed of a connecting bolt inserted into each of the guide elongated hole of the base leg and the insertion hole of the slide leg, and a nut screwed onto the tip of the shaft of the connecting bolt; A height-adjustable leg structure characterized in that the connecting bolt and nut are loosely fastened to the base leg so that the slide leg can slide relative to the base leg.

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