Pre-installed handrail for temporary scaffolding

Abstract

This invention provides a pre-positioned handrail for temporary scaffolding that allows the hook to be positioned at the interference point earlier than conventional designs. [Solution] The lower side of the hook member 32 has a hook 36 that protrudes so as to be able to lock onto the lower surface of the upper latching fitting 70. When the hook member 32 is in the first position, the hook 36 does not interfere with the upper latching fitting 70, and when the hook member 32 is in the second position, it is positioned in an interfering position below the lower surface of the upper latching fitting 70. As the latch portion 30 transitions to engaging with the upper latching fitting 70, the hook member 32 swings from the first position to the second position by sliding against the upper surface of the upper latching fitting 70. As a result, the hook is positioned in the interfering position earlier.

Description

Technical Field

[0001] The present invention relates to a front handrail for a temporary scaffold.

Background Art

[0002] A front handrail for a temporary scaffold is known from the handrail of Patent Document 1. The front handrail for a temporary scaffold is configured such that latching insertion portions provided at both ends of a horizontal member are latched to latching fittings provided on a pair of columns respectively. Further, in the front handrail for a temporary scaffold, a pair of cross members whose upper ends are pivotally attached to mounting fittings fixed to both ends of the horizontal member are arranged in a crossed manner, and their lower ends are attached to latching fittings provided on a pair of columns respectively.

[0003] Further, the mounting fitting is provided with a latching piece that is pressed by the upper end of the cross member toward the latching fitting side and is located on the plate of the latching fitting. With the above configuration, when each cross member provided on both mounting fittings is rotated, the latching piece is pressed against the latching fitting from the outside by the upper end portions of both cross members, and the hook portion of the latching piece is located below the latching fitting. As a result, even if both latching insertion portions fitted into the latching fitting attempt to move upward (attempt to come off), the hook portion of the latching piece catches on the lower end of the latching fitting, thereby preventing the upward movement of both latching insertion portions.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, the above-mentioned temporary scaffolding handrail is designed so that, only when each bracing member is rotated, the upper ends of both bracing members press the latching piece against the latching fitting from the outside, causing the hook portion of the latching piece to be positioned below the latching fitting (hereinafter referred to as the interference position). Therefore, when the bracing members are not rotated, the latching piece hangs loosely, which is undesirable.

[0006] It is preferable that the movement of the latching piece to the position of interference with the latching fitting be carried out as early as possible. The object of the present invention is to solve the above problems and provide a pre-positioned handrail for temporary scaffolding that allows the hook to be positioned at the interference position earlier than in conventional methods. [Means for solving the problem]

[0007] To solve the above problems, the present invention provides a temporary scaffolding handrail that is positioned between a pair of support columns, each having a U-shaped hook fitting in a flat cross section, arranged vertically at a predetermined interval, and comprising a handrail member that is positioned horizontally by the hook fittings being hooked onto the upper hook fittings, and a pair of diagonal bracing members that are arranged intersecting each other by the second connecting portion being attached to the lower hook fittings of the support columns at their upper ends which are pivotably attached to each of the first connecting portions, and at their lower ends the second connecting portion is attached to the lower hook fittings of the support columns, and the first connecting portion has a hook member at a first position The hook member is positioned to swing freely between the first and second positions, and the upper side of the hook member has an engaging projection that protrudes so as to be able to abut against the upper surface of the upper latching fitting, and the engaging projection has a sliding contact surface that causes the hook to swing from the first position to the second position by sliding against the upper surface of the upper latching fitting while the hook is transitioning to engage with the upper latching fitting, and the lower side of the hook member has a hook that protrudes so as to be able to lock onto the lower surface of the upper latching fitting, and the hook is positioned so as not to interfere with the upper latching fitting when the hook member is in the first position, and is positioned in an interfering position below the lower surface of the upper latching fitting when the hook member is in the second position.

[0008] Furthermore, it is preferable that the hook member has a biasing means for positioning it in the first position. Furthermore, the biasing means may be the weight portion of the hook member, which is positioned to constantly apply rotational force to the first position.

[0009] Furthermore, the weight portion may be formed as a bulge on the upper part of the hook member, so that it is always positioned to apply rotational force to the first position. Furthermore, it is preferable that the upper end of each bracing member has a locking portion that prevents the hook member, which is located in the second position, from rotating to the first position when the bracing members are arranged to intersect each other.

[0010] Furthermore, it is preferable that the first connecting portion has a holding portion for holding the hook member in the first position. [Effects of the Invention]

[0011] According to the present invention, the hook can be positioned at the interference location earlier than in conventional methods. [Brief explanation of the drawing]

[0012] [Figure 1] This is a front view of a temporary scaffolding handrail according to one embodiment of the present invention, when attached to opposing support columns. [Figure 2] This is a front view showing the folded state of a temporary scaffolding handrail according to one embodiment. [Figure 3] This is a perspective view of the first connecting portion of one embodiment. [Figure 4] (a) and (b) are perspective views of a hook member according to one embodiment. [Figure 5] This is a partially broken cross-sectional view of the first connecting portion, showing its state before insertion into the latching mechanism. [Figure 6] This is a partially broken cross-sectional view of the first connecting portion, showing it in the state of being inserted into the latching fitting. [Figure 7]It is a partial fracture cross-sectional view of a first connecting part showing the state after being hooked to a hooking fitting. [Figure 8] It is a partial fracture cross-sectional view of a first connecting part showing the state when the cross members intersect each other. [Figure 9] It is a perspective view of a second connecting part of an embodiment. [Figure 10] It is an explanatory view of a state where a second connecting part of an embodiment is fitted to a hooking fitting. [Figure 11] It is an explanatory view of a state where a wedge member is inserted into a hooking city after a second connecting part of an embodiment is fitted to a hooking fitting.

Mode for Carrying Out the Invention

[0013] (Embodiment) Hereinafter, a temporary scaffold front handrail of an embodiment embodying the present invention will be described with reference to FIGS. 1 to 11. Hereinafter, the temporary scaffold front handrail will be simply referred to as the front handrail.

[0014] <Hooking fitting 70> First, the hooking fitting 70 will be described. As shown in FIG. 1, a plurality of hooking fittings 70 are arranged at predetermined intervals in the vertical direction on the four sides of the outer peripheral surface of the support column 68.

[0015] Each hooking fitting 70 is formed in a U-shaped cross-section by a pair of side walls 70a whose base ends are integrally fixed to the support column 68 and a connecting wall 70b that connects the tips of the side walls 70a. The hooking fitting 70 has a hooking hole 72 surrounded by the pair of side walls 70a, the connecting wall 70b, and the support column 68. The connecting wall 70b is arranged obliquely so as to approach the outer peripheral surface of the support column 68 as it goes downward.

[0016] <Front handrail 10> As shown in FIGS. 1 and 2, the front handrail 10 includes a rod-shaped handrail member 20 and rod-shaped cross members 50A and 50B. The handrail member 20 and the cross members 50A and 50B are made of metal pipes. The handrail member 20 is horizontally arranged when both ends are attached to the upper hooking fittings 70 respectively provided on the pair of support columns 68.

[0017] First connecting portions 22 and 23 are provided at both ends of the handrail member 20. The first connecting portion 22 has the same configuration when viewed in the direction in which the handrail member 20 extends to the left and right, and when the left and right sides are reversed, so the first connecting portion 22 will be described below as shown in Figures 3, 5 to 7. In the first connecting portion 23, the same components as those constituting the first connecting portion 22 are given the same reference numerals, and their descriptions are omitted.

[0018] <First connecting part 22> As shown in Figure 3, the first connecting portion 22 in this embodiment is composed of a connecting fitting 25. The connecting fitting 25 is formed in a U-shape in cross-section by a pair of side walls 27 and a connecting wall 28 that connects both side walls 27, and extends in the vertical direction. In this embodiment, the connecting wall 28 is arranged to connect both side walls 27 from approximately the center to the lower part in the vertical direction of both side walls 27, but the configuration is not limited to this. For example, the connecting wall 28 may connect both side walls 27 from the upper to the entire lower part.

[0019] The upper ends of each side wall 27 are positioned to sandwich the outer peripheral surface of the end of the handrail member 20 and are integrally fixed by welding or the like. As shown in Figure 3, in the side walls 27, notches 29 are formed in the region close to the connecting wall 28, extending upward from the lower end. In the side walls 27, the portion closer to the connecting wall 28 than the notches 29 and the connecting wall 28 form a downward-facing latch portion 30.

[0020] As shown in Figure 7, the latch portion 30 can be inserted into and detached from the latching hole 72 of the latching fitting 70 until the end surface 29a of the notch portion 29 is locked to the upper end surface of the connecting wall 70b of the latching fitting 70.

[0021] As shown in Figures 3, 5 to 8, a plate-shaped hook member 32 is supported between the two side walls 27 by a shaft 33 so as to be able to swing between a first position and a second position, which will be described later. In this embodiment, the shaft 33 is a bolt fixed to the two side walls 27 in cooperation with a nut 33a, as shown in Figures 4(a) and 4(b), but a pin or the like may also be used.

[0022] As shown in Figure 5, the mounting position of the hook member 32 is near the end surface 29a of the notch 29. As shown in Figures 4(a) and 4(b), the hook member 32 has a recess 34 formed between the upper and lower sides of the hook portion 30. Due to this recess 34, the upper part of the hook member 32 has an engaging projection 35 that protrudes so as to be able to abut against the upper surface of the connecting wall 70b of the fastening fitting 70, as shown in Figure 7, and a hook 36 is formed on the lower side.

[0023] As shown in Figures 4(a) and 4(b), the engaging projection 35 has a weight portion 37 that is formed to bulge out toward the latch portion 30 at the upper part of the hook member 32. The weight portion 37 constantly applies rotational force to the hook 36, positioning the hook member 32 to the first position, i.e., the position where the engaging projection 35 engages with the inner surface of the latch portion 30 (see Figure 5). The weight portion 37 corresponds to a biasing means.

[0024] As shown in Figure 5, in the latch portion 30, the portion 31 that engages the engaging projection 35 with the inner surface of the latch portion 30 corresponds to the holding portion that holds the hook member 32 in the first position. The lower surface of the engaging projection 35 (i.e., the upper inner surface of the recess 34) is a sliding contact surface 35a. With the hook member 32 in the first position, the sliding contact surface 35a can slide against the upper surface of the connecting wall 70b of the fastening fitting 70 provided on the support column 68 while the latch portion 30 is being inserted from above into the fastening hole 72 of the fastening fitting 70, as shown in Figure 6.

[0025] From the initial state where the sliding contact surface 35a is in contact with the upper surface of the connecting wall 70b of the latching fitting 70, when the latch portion 30 is moved further downward against the biasing force of gravity from the weight portion 37, the hook member 32 is pressed upward via the sliding contact surface 35a. As a result, the hook member 32 is made to swing counterclockwise in Figure 6. Due to the counterclockwise swing of the hook member 32 (engaging projection 35), the sliding contact surface 35a slides against the upper surface of the connecting wall 70b of the latching fitting 70. This allows the engaging projection 35 to move to the second position (see Figure 7).

[0026] As shown in Figure 7, the second position of the engaging projection 35 is the position in which the fastening fitting 70 is engaged in the recess 34 and the hook 36 can be locked to the lower surface of the fastening fitting 70. With the above configuration, when the hook member 32 shown in Figure 5 is in the first position, the hook 36 does not interfere with the fastening fitting 70. Also, as shown in Figure 7, when the hook member 32 is in the second position, the hook 36 is positioned in an interfering position located below the lower surface of the fastening fitting 70.

[0027] <Bracing members 50A, 50B> As shown in Figure 3, the upper ends of the bracing members 50A and 50B are supported by a shaft 51 so as to be able to swing vertically between the lower parts of the side walls 27 of the connecting fitting 25 on the side opposite the latch portion 30 from the notch portion 29. In this embodiment, the shaft 51 is a bolt fixed to the side walls 27 in cooperation with a nut 51a as shown in Figure 3, but it may also be a pin or the like.

[0028] The central portion 54 in the longitudinal direction of the bracing members 50A and 50B is formed into a flat plate shape by crushing the pipe. Because the central portion 54 of the bracing members 50A and 50B is formed into a flat plate shape, as shown in Figure 1, the bracing members 50A and 50B can intersect without their central portions 54 interfering with each other.

[0029] As shown in Figures 5 to 8, a locking member 52 is fixed to the upper end of the bracing member 50A. As shown in Figures 5 to 8, the locking member 52 has an interference portion 53. The interfering portion 53 is positioned so as not to fall within the swing trajectory between the first and second positions of the hook member 32 when the bracing member 50A is in a vertical state as shown in Figure 5.

[0030] Furthermore, as shown in Figures 1 and 8, when the bracing members 50A and 50B are arranged diagonally in a crossing state, the interference portion 53 is formed to enter the swing trajectory and prevent the hook member 32, which is located in the second position, from rotating to the first position. The locking member 52 corresponds to the locking portion.

[0031] <Second connection part> As shown in Figures 1 and 2, second connecting portions 55 and 56 are provided at the lower ends of the bracing members 50A and 50B, respectively. The second connecting portions 55 and 56 have the same configuration when viewed in the left-right direction and reversed horizontally, so the second connecting portion 55 will be described below. In the second connecting portion 56, the same reference numerals are used for components that make up the second connecting portion 55, and their descriptions are omitted.

[0032] As shown in Figures 9 to 11, the second connecting portion 55 has a connecting fitting 57. The connecting fitting 57 comprises a pair of side walls 58 and connecting walls 59 and 60 that connect the upper and lower parts of the side walls 58, respectively. It extends vertically and is formed in a U-shape in cross-section. As shown in Figure 9, the connecting walls 59 and 60 are positioned on the side opposite the bracing member 50A. Each side wall 58 is positioned to sandwich the outer peripheral surface of the lower end of the bracing member 50A and is integrally fixed by welding or the like.

[0033] As shown in Figure 9, openings 61 are formed in both side walls 58, excluding the parts connected by connecting walls 59 and 60. As shown in Figure 10, the openings 61 are sized to allow the fastening fittings 70 to be fitted until the connecting walls 59 and 60 abut against the support columns 68.

[0034] As shown in Figure 9, a pair of bearings 62 and 63, each with a shaft 64 mounted on it, are provided at the upper end of the connecting wall 59 and the upper end of both side walls 58, respectively. A wedge member 65 is positioned between the bearings 62 and 63.

[0035] The wedge member 65 has an elongated hole 65a in the longitudinal direction through which a shaft 64 passes, and is slidable vertically relative to the shaft 64. Hereinafter, with the wedge member 65 positioned vertically as the reference point, the upper end of the elongated hole 65a will be referred to as the upper end and the lower end as the lower end.

[0036] When the wedge member 65 is positioned vertically and the shaft 64 is locked into the upper end of the elongated hole 65a, it is tapered towards the lower end so that it can be inserted into the locking hole 72 of the locking fitting 70, as shown in Figure 11.

[0037] As shown in Figure 11, when the fastening fitting 70 is inserted through the fastening hole 72, the lower end is positioned to pass through the connection wall 60 and the pin 66 installed between the side walls 58.

[0038] On the other hand, when the wedge member 65 moves until the shaft 64 engages with the lower end of the elongated hole 65a, the wedge member 65 disengages from the locking hole 72 of the locking fitting 70, and its length is set so that it can rotate around the shaft 64 above the side walls 58.

[0039] Furthermore, the wedge member 65 can be positioned laterally by rotating it approximately 90 degrees around the shaft 64 with the shaft 64 locked to the lower end of the elongated hole 65a, as shown in Figure 10, and tilting it until it is locked to one of the side walls 58. Hereinafter, the laterally tilted state of the wedge member 65 will simply be referred to as the tilted state (see the dashed line in Figure 9).

[0040] (Effect of the embodiment) The operation of the preceding handrail 10, configured as described above, will now be explained. When attaching a preliminary handrail 10 for a floor above the floor where the worker is located to the support column 68, the worker grasps both bracing members 50A and 50B in a vertical position, as shown in Figure 5, and raises the preliminary handrail 10.

[0041] The following describes the attachment of the first connecting portion 22 on the bracing member 50A side to the support column 68. As shown in Figures 5 to 7, the latch portion 30 of the first connecting portion 22 of the handrail member 20 is inserted into the latch hole 72 of the upper latch fitting 70 of the support column 68. The latch fitting 70 to which the first connecting portion 22 is attached is located above the latch fitting 70 to which the second connecting portions 55 and 56 are attached, and is therefore referred to as the upper latch fitting 70. On the other hand, the latch fitting 70 to which the second connecting portions 55 and 56 are attached is located below the upper latch fitting 70, and is therefore referred to as the lower latch fitting 70.

[0042] Figure 5 illustrates the state before the latch portion 30 is inserted into the locking hole 72 of the upper locking fitting 70. As shown in the figure, the engaging projection 35 is locked to the inner surface of the latch portion 30 at portion 31 of the latch portion 30, so the hook member 32 is in the first position. As a result, the hook 36 does not interfere with the upper locking fitting 70.

[0043] With the hook member 32 in the first position, the worker inserts the latch portion 30 into the latch hole 72 of the upper latch fitting 70 from above, as shown in Figure 6. As a result, while the latch portion 30 is being inserted into the latching hole 72 (during the latching transition), the sliding contact surface 35a of the hook member 32 slides against the upper surface of the connecting wall 70b of the upper latching fitting 70.

[0044] In other words, the latch portion 30 is inserted downward into the latch hole 72 against the biasing force of gravity of the weight portion 37, with the sliding contact surface 35a in contact with the upper surface of the connecting wall 70b until the end surface 29a of the notch portion 29 is locked onto the upper end surface of the connecting wall 70b.

[0045] As a result, the engaging projection 35 of the hook member 32 is pressed upward via the sliding contact surface 35a, causing the hook member 32 to swing counterclockwise in Figure 6. The hook member 32 (engaging projection 35) moves to the second position (see Figure 7) by the counterclockwise swinging motion of the hook member 32.

[0046] As a result, as shown in Figure 7, the upper latching fitting 70 is engaged in the recess 34, so that the hook 36 is positioned below the lower surface of the upper latching fitting 70 and can be engaged with the lower surface of the latching fitting 70, i.e., in an interference position.

[0047] The procedure for attaching the first connecting portion 23 of the bracing member 50B to the upper fastening fitting 70 of the support column 68 is the same as for the bracing member 50A, so the explanation is omitted. As described above, after attaching the first connecting portion 22 of the bracing members 50A and 50B to the upper fastening fitting 70, the second connecting portion 55 at the lower end of the bracing members 50A and 50B is attached to the lower fastening fitting 70.

[0048] The following describes how to attach the second connecting portion 55 on the bracing member 50A side to the support column 68. Note that the wedge member 65 of the second connecting portion 55 is in a tilted position, as shown by the dashed line in Figure 9.

[0049] The worker positions the vertical bracing member 50A shown in Figure 7 at an angle as shown in Figures 8 and 10, and inserts the lower latching fitting 70 into the opening 61 of the connecting fitting 57 of the second connecting section 55.

[0050] When the bracing member 50A is positioned diagonally as shown in Figure 8, the interfering portion 53 of the locking member 52 of the bracing member 50A enters the swing trajectory between the first and second positions of the hook member 32 and is positioned to prevent the hook member 32, which is located in the second position, from rotating to the first position.

[0051] In this state, the worker raises the fallen wedge member 65. Then, as shown in Figure 11, the worker inserts the wedge member 65 into the locking hole 72 of the lower locking fitting 70 until the shaft 64 locks into the upper end of the elongated hole 65a, and positions its lower end through the space between the connecting wall 60 and the pin 66. As a result, the second connecting portion 55 of the bracing member 50A is attached to the lower locking fitting 70.

[0052] The procedure for attaching the second connecting portion 56 on the bracing member 50B side to the lower fastening fitting 70 of the support column 68 is the same as for the bracing member 50A, so the explanation is omitted. This embodiment has the following features.

[0053] (1) The leading handrail 10 is positioned between a pair of support columns 68, each having a flat cross-section U-shaped fastening fitting 70 that is positioned vertically at a predetermined interval. The leading handrail 10 has first connecting parts 22 and 23 at both ends, each having a latching part 30 that is latched to the upper fastening fitting 70, and also has a handrail member 20 that is positioned horizontally by the latching part 30 being latched to the fastening fitting 70.

[0054] The leading handrail 10 includes a pair of diagonal bracing members 50A and 50B whose upper ends are pivotally attached to the first connecting parts 22 and 23, respectively, and which are arranged to intersect each other. The lower ends of the bracing members 50A and 50B have second connecting parts 55 and 56, which are attached to the lower fastening fittings 70 of the support column 68. In addition, hook members 32 are positioned on the first connecting parts 22 and 23 so as to be able to swing between a first position and a second position.

[0055] The upper side of the hook member 32 has an engaging projection 35 that protrudes so as to be able to contact the upper surface of the upper latching fitting 70. The engaging projection 35 has a sliding contact surface 35a that causes the hook member 32 to swing from a first position to a second position by sliding against the upper surface of the upper latching fitting 70 when the latch portion 30 is in the process of engaging with the upper latching fitting 70.

[0056] The lower side of the hook member 32 has a hook 36 that protrudes so as to be able to be locked onto the lower surface of the upper latching fitting 70. When the hook member 32 is in the first position, the hook 36 does not interfere with the upper latching fitting 70, and when the hook member 32 is in the second position, it is positioned in an interfering position below the lower surface of the upper latching fitting 70.

[0057] With the above configuration, as the latch portion 30 transitions to engaging with the upper latch fitting 70, the hook member 32 swings from the first position to the second position by sliding against the upper surface of the upper latch fitting 70. As a result, the hook can be positioned in the interference position at an earlier stage.

[0058] (2) The hook member 32 of this embodiment has a weight portion 37 positioned to always apply rotational force toward the first position, which serves as a biasing means for positioning the hook member 32 in the first position. As a result, when the hook member 32 is in the first position, it can be positioned in a location that does not interfere with the upper latching fitting 70.

[0059] (3) In this embodiment, the weight portion 37 is formed as a bulge on the upper part of the locking member 52, so that it is always positioned to apply rotational force toward the first position. As a result, the weight portion 37 can be easily formed.

[0060] (4) In this embodiment, the upper ends of the bracing members 50A and 50B are provided with a locking member 52 (locking part) that prevents the hook member 32, which is located in the second position, from rotating to the first position when the bracing members 50A and 50B are arranged to intersect each other.

[0061] As a result, in this embodiment, when the bracing members 50A and 50B are arranged to intersect each other, the locking member 52 (locking part) can prevent the hook member 32, which is located in the second position, from rotating to the first position. When the bracing members 50A and 50B are arranged to intersect each other, the latch part 30 can be prevented from detaching from the fastening fitting 70 of the support column 68.

[0062] (5) In this embodiment, the portion 31 to which the engaging projection 35 engages with the inner surface of the latch portion 30 is a holding portion that holds the hook member 32 in the first position. As a result, with the hook member 32 held in the first position, the latch portion 30 can be inserted into the fastening fitting 70 and fastened.

[0063] This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined and implemented to the extent that they do not contradict each other technically.

[0064] In the above embodiment, the biasing means is the center of gravity of the hook member 32 due to the weight portion 37, but it is not limited to this. A spring or the like may be used as the biasing means. For example, a torsion coil spring or the like may be wound around the shaft 33 to constantly apply a rotational force to the hook member 32 to the first position.

[0065] In the above embodiment, the first position was set to the position where the engaging projection 35 engages with the inner surface of the latch portion 30, but the first position may also be set to the position where the hook 36 abuts against the upper end of the bracing member 50A in a vertical state. Alternatively, the first position may be set to the position where it abuts against the locking member 52 provided at the upper end of the bracing member 50A.

[0066] In this case, the locking member 52 provided on the vertically positioned bracing member 50A corresponds to the holding portion. In the above embodiment, the latch portion 30 is configured to be integrated with the connecting fitting 25. Alternatively, it may be modified as follows.

[0067] The latch portion 30 of the connecting fitting is omitted, and a curved portion that curves downward by 90 degrees is formed on the end side of the handrail member 20. Then, the end portion that extends downward from the curved portion is crushed and formed so that it can be inserted into the hooking hole 72 of the latch fitting 70, thereby forming the latch portion.

[0068] In this case, the first connecting portion consists of a hook portion that is curved and flattened at the end of the handrail member, and a connecting fitting fixed to the handrail member. In the above embodiment, the wedge member 65 has a shaft 64 passing through the elongated hole 65a, and is slidable vertically relative to the shaft 64. Instead of this configuration, the shaft 64 and the elongated hole 65a may be omitted, and the configuration may be as follows.

[0069] The wedge member 65 is provided with a locking step (not shown) at its upper end. The locking step (not shown) is formed to lock onto the upper surface of the connecting wall 60 when the lower end of the wedge member 65 is positioned to pass through between the connecting wall 60 and the pin 66. [Explanation of Symbols]

[0070] 10…Pre-installed handrail for temporary scaffolding 20…Handrail components 22, 23...1st connection part 25…Connecting fittings 27...Side wall 28…Connecting wall 29... Notch 29a…Terminal surface 30…Betting section 31...part (holding part) 32... Hook component 33...axis 33a... Nut 34…recess 35…Engagement protrusion 35a…Sliding surface 36... Hook 37… Weight part 50A, 50B... bracing members 51...axis 51a... Nut 52... Locking component (locking part) 53... Interference section 54...Central part 55, 56...Second connection part 57…Connecting fitting 57 58…Side wall 58 59, 60…Connecting wall 61…Opening 62... Bearings 63... Bearings 64...axis 65...Wedge member 65a…long hole 68…post 70…Lock fasteners 70a…Side wall 70b…Connecting wall 72...Latching hole

Claims

1. A temporary scaffolding handrail is positioned between a pair of support columns, each having a flat cross-section U-shaped fastening bracket arranged vertically at predetermined intervals, A handrail member having a first connecting portion at both ends having a latch portion that is latched to the upper latching fitting, and the handrail member being positioned horizontally by the latch portion being latched to the latching fitting, The upper end is pivotally attached to each first connecting portion, and the lower end has a second connecting portion, the second connecting portion being attached to the lower fastening fitting of the support column, thereby comprising a pair of bracing members arranged to intersect each other. A hook member is positioned in the first connecting portion so as to be able to swing between a first position and a second position, The upper side of the hook member has an engaging projection that protrudes so as to be able to abut against the upper surface of the upper fastening fitting, The engaging projection has a sliding contact surface that causes the latch to pivot from the first position to the second position by sliding against the upper surface of the upper latch during the transition of the latch to the upper latch. The lower side of the hook member has a hook that protrudes so as to be able to be locked onto the lower surface of the upper fastening fitting. The aforementioned hook is configured to not interfere with the upper latch when the hook member is in the first position, and to be positioned in an interfering position below the lower surface of the upper latch when the hook member is in the second position, in order to provide a temporary scaffolding handrail.

2. The preceding handrail for temporary scaffolding according to claim 1, wherein the hook member has a biasing means for positioning it at the first position.

3. The preceding handrail for temporary scaffolding according to claim 2, wherein the biasing means is the weight portion of the hook member which is positioned to constantly apply rotational force to the first position.

4. The lead handrail for temporary scaffolding according to claim 3, wherein the weight portion is formed to bulge out on the upper part of the hook member, so that it is always positioned to apply rotational force to the first position.

5. The temporary scaffolding handrail according to any one of claims 1 to 4, wherein the upper end of each bracing member has a locking portion that prevents the hook member located at the second position from rotating to the first position when the bracing members are arranged to intersect each other.

6. The first connecting portion has a holding portion for holding the hook member in the first position, as described in claim 5.

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