Temporary opening / closing safety bar for scaffold

Abstract

To provide a temporary opening / closing safety bar for a scaffold, which can be installed and utilized as a safety measure in a worker entrance / exit opening of a working scaffold temporarily installed in a construction site.SOLUTION: This safety bar is composed of a supporting pipe material 2 installed in a vertical steel pipe on one side of a worker entering / leaving opening part in a state of inclining in the direction for the lower end side to approach the vertical steel pipe by a pipe clamp 3, a movable pipe material 4 inserted into this supporting pipe material so as to rotate and elevate, and a safety bar body 5 connected to an upper end part of the movable pipe material and extending in the horizontal direction on one side. When the safety bar body 5 at the closing limit position is opened, the movable pipe member 4 and the safety bar body 5 are pushed up against the urging force of the spring member 33 as the support roller 24 relatively moves from the lowest position to the highest position of the spiral end surface 22.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an opening / closing safety bar that is temporarily installed in place of a door body at an opening for workers to enter and exit a work scaffold that is temporarily installed at a construction site. [Background technology]

[0002] At construction sites, temporary worker access openings on scaffolding are typically constructed with tall, openable and closable gates made of steel pipes or other materials. However, in locations where the temporary access opening is relatively low or where workers frequently move materials by hand, a simple safety measure is employed in which a single bar is installed at waist height instead of the gate. While no patent documents are available for such a configuration, one end of the bar is pivotally supported around a support shaft so that it can swing up and down and cannot swing downward from a horizontal position. When a worker attempts to pass through, the bar is lifted upward from a horizontal position against gravity, causing it to stand upright. After passing through, the worker releases his or her hand, allowing gravity to return the bar to its original horizontal position. Summary of the Invention [Problem to be solved by the invention]

[0003] In the case of the conventional safety bar described above, which is lifted upward to open the opening for workers to enter and exit, it is not possible to push the door open with one's body as with a typical door, and at least one hand must be used to lift the safety bar, which is inconvenient. Also, a safety bar that can be opened horizontally is conceivable, but this requires a means, such as a torsion coil spring, to return the safety bar to its original closed position after it has been pushed open. Moreover, even a single safety bar that is significantly lighter than a typical door requires a powerful torsion coil spring to reliably maintain the automatic closing action of the torsion coil spring over a long period of time, which not only requires considerable cost but also requires a considerable force to open the door, leaving room for improvement. [Means for solving the problem]

[0004] The present invention proposes a temporary opening / closing safety bar for scaffolding that can solve the above-mentioned conventional problems. To facilitate understanding of the relationship with the embodiments described below, the reference numerals used in the description of the embodiments are enclosed in parentheses to denote the temporary opening / closing safety bar for scaffolding according to the present invention. The reference numerals are a vertically oriented support pipe member (2), a pipe clamp (3) attached to the side of the support pipe member (2) in order to attach the support pipe member (2) to a vertical steel pipe on the scaffolding side, a movable pipe member (4) inserted into the support pipe member (2) so as to be able to rotate on its own axis and move up and down, and a safety bar main body (5) connected to the upper end of the movable pipe member (4) and extending horizontally on one side. A spring (33) is provided to urge the movable pipe (4) and the safety bar main body (5) downward relative to the support pipe (2), and a spiral end surface (22) is formed at the lower end of the movable pipe (4) along the circumferential surface of the movable pipe (4), and a support roller (24) is attached to the support pipe (2) so as to be rotatable around a support shaft (23) along the radial direction of the movable pipe (4) and support the movable pipe (4) via the spiral end surface (22). When the safety bar body (5) is in the closed limit position, the support roller (24) is at the lowest position of the spiral end surface (22), and when the safety bar body (5) in this closed limit position moves to the open position, the support roller (24) moves relative to the spiral end surface (22) from the lowest position to the highest position, and as a result, the movable pipe member (4) and the safety bar body (5) are pushed up against the urging force of the spring member (33). When the pipe clamp (3) is fastened to the vertical steel pipe (38a) on the scaffolding side, the support pipe material (2) is not in a vertical position parallel to the vertical steel pipe (38a), but is configured so that the lower end is inclined in a direction approaching the vertical steel pipe (38a). [Effects of the Invention]

[0005] In the temporary opening / closing safety bar for scaffolding of the present invention, when the support pipe is held in a vertical position, the weight of the movable pipe and safety bar body installed inside the support pipe and the downward biasing force of the spring cause the movable pipe and safety bar body to rotate horizontally while descending together relative to the support pipe until the support roller fits into the lowest position of the spiral end face of the movable pipe, switching the safety bar body to its closed-end position. The pipe clamp is fastened to a vertical steel pipe on one side of the worker access opening so that the safety bar body switched to the closed-end position is oriented across the worker access opening of the work scaffolding. As a result, the support pipe supporting the movable pipe and safety bar body is tilted so that its lower end approaches the vertical steel pipe on the work scaffolding side. Therefore, if the safety bar main body is connected to the movable pipe member at a right angle, the tip of the safety bar main body will be inclined downward, but if the inclination angle is only a few degrees, there is no significant problem in using it as is, but if it is preferable for the safety bar main body to be in a horizontal position, the horizontal safety bar main body can be fixed and integrated with the movable pipe member that is inclined integrally with the support pipe member. Also, from a safety standpoint, it is preferable that the tip of the safety bar main body abuts from inside the aisle against the vertical steel pipe on the opposite side of the worker entrance opening from the side where the pipe clamp is fastened, so that the safety bar main body can only be opened toward the inside of the aisle.

[0006] When the temporary opening / closing safety bar for scaffolding of the present invention is attached to the opening for worker entrance and exit of the work scaffold as described above, the safety bar main body is held in the closed limit position that crosses the opening for worker entrance and exit. Therefore, when a worker enters the work scaffold from outside, the safety bar main body held in the closed limit position is pushed into the work scaffold with the worker's hands or body, causing the open safety bar main body to open with an upward movement that is reverse to the automatic closing movement toward the closed limit position, and when the worker enters the work scaffold and moves away from the opened safety bar main body, the safety bar main body automatically closes toward the closed limit position.

[0007] According to the temporary opening / closing safety bar for scaffolding of the present invention, even if the safety bar body is lightweight and simple, for example, formed from a single steel pipe, the safety bar body is provided with a spring material that biases the safety bar body in the downward direction, thereby reliably switching and holding the safety bar body in the predetermined closed limit position, compared to a configuration that relies solely on gravity acting on the movable pipe member and the safety bar body to lower the safety bar body. Moreover, compared to a configuration that uses a torsion coil spring to provide the rotational force that rotates the safety bar body to the closed limit position, the spring material can be a general compression or tension coil spring that expands and contracts, thereby simplifying the structure and making it inexpensive to implement. Another feature of the present invention is that the support pipe member, which forms the axis of the opening / closing rotation of the safety bar body, is inclined so that the lower end of the support pipe member is opposite the side where the safety bar body is in the closed limit position, i.e., toward the vertical steel pipe of the scaffolding opening to which the support pipe member is attached with a pipe clamp. With this configuration of the present invention, when the safety bar main body is opened from the closed limit position, it tilts diagonally upward, and a diagonally downward rotational force acts to return it to its original closed limit position. This diagonally downward rotational force enhances the rotational force to return it to the closed limit position, which is generated when the spiral end face of the lower end of the movable pipe member is supported by the support roller on the support pipe member. Therefore, when the opened safety bar main body is released, it automatically returns to its original closed limit position, preventing a dangerous situation where it remains in the open position.

[0008] When carrying out the present invention, specifically, the safety bar main body (5) is constructed so as to be freely extendable and contractible, from an outer square pipe material (13) having one end fixed to the movable pipe material (4) and an inner square pipe material (14) fitted into the outer square pipe material (13) so as to be freely inserted and removed, the outer square pipe material (13) is provided with a fixing bolt (15) for fixing the inner square pipe material (14) at any drawn-out position, and a plate material (16) having a top and bottom width and projecting on both the top and bottom sides from the inner square pipe material (14) with the plate surface oriented vertically can be provided at the tip of the inner square pipe material (14). This configuration not only allows the overall length of the safety bar body to be freely adjusted according to the width of the worker access opening of the work scaffold to which the temporary opening / closing safety bar for scaffolding of the present invention is attached, but also prevents a dangerous situation in which the safety bar body is accidentally pushed outward from inside the work scaffold by placing the plate member at the tip of the safety bar body adjacent to the vertical steel pipe located on one side of the worker access opening from the inside of the work scaffold when the safety bar body is in the fully closed position. Moreover, in such a situation, the amount of protrusion of the safety bar body into the work scaffold can be minimized compared to when the tip of the safety bar body itself abuts the vertical steel pipe of the work scaffold, which is preferable in terms of safety. Furthermore, when the safety bar body is shortened to its minimum length for storage or transportation, the plate member prevents the entire inner square pipe member from entering the outer square pipe member, and the plate member can also function as a handle for inserting and removing the inner square pipe member.

[0009] The spring member 33 that urges the movable pipe member 4 and the safety bar main body 5 downward relative to the support pipe member 2 can be assembled in various ways. The most basic assembly method is to install a tension coil spring between the base end of the safety bar main body 5 in the closed limit position and the outer circumferential surface of the support pipe member 2 located below the base end to pull down the safety bar main body 5. In contrast to this configuration, in the present invention, the lower end of a vertical central shaft (31) that extends from inside the movable pipe (4) into the safety bar main body (5) is attached to the lower end of the support pipe (2) that extends below the lower end of the movable pipe (4), and a compression coil spring (34) that serves as the spring material (33) can be fitted onto the central shaft (31) between a spring holder (35) provided at the upper end of the central shaft (31) and the bottom plate (13a) of the safety bar main body (5). With this configuration, the length of the compression coil spring that can be used is limited by the internal space of the safety bar main body, but the compression coil spring to be used and the central shaft that holds the compression coil spring are protected within the internal space without being exposed to the outside of the temporary opening and closing safety bar for scaffolding, thereby avoiding the adverse effects that would occur if the compression coil spring or the like were exposed to the outside.

[0010] When using the above configuration, a large-diameter through-hole (41) is provided in the bottom plate (13a) of the safety bar main body (5), and an inverted gate-shaped spring retainer (42) is provided that passes through the large-diameter through-hole (41) and enters the movable pipe member (4). The compression coil spring (34) passing through the large-diameter through-hole (41) can be fitted to the central shaft (31) between the upper-end spring retainer (35) of the central shaft (31) and the inverted gate-shaped spring retainer (42). With this configuration, the length of the compression coil spring that can be used is not limited by the internal space of the safety bar main body, allowing for the use of a compression coil spring of the required length. Furthermore, the upper-end spring retainer (35) of the central shaft (31) can be positioned outside the safety bar main body (5) through an opening (13c) provided in the top plate (13b) of the safety bar main body (5). This configuration allows the use of a compression coil spring of the required length without using the inverted gate-shaped cross-section spring support seat. In this case, it is desirable to use a cover member to cover the upper end spring support (35) exposed on the outside of the safety bar body (5).

[0011] The upper end of the central shaft (31) is attached to the upper end of the movable pipe (4) and extends downward through the movable pipe (4). A spring holder (45) is provided at the lower end of the support pipe (2) extending downward from the lower end of the movable pipe (4). The central shaft (31) passes through this spring holder (45). The compression coil spring (34) can be fitted to the central shaft (31) between the spring holder (45) and the lower end spring holder (46) of the central shaft (31). This configuration facilitates installation and maintenance of the compression coil spring. Furthermore, when this configuration is adopted, the safety bar main body (5) can be attached to the side of the movable pipe (4) protruding upward from the upper end of the support pipe (2), and the upper end of the central shaft (31) can be fixed to the upper end of the movable pipe (4). This configuration makes it easier to attach the upper end of the central shaft to the movable pipe member. [Brief explanation of the drawings]

[0012] [Figure 1]FIG. 1A is an external view of a work scaffold showing the state in which a temporary opening / closing safety bar for scaffolding of the present invention has been attached to an opening for workers to enter and exit the work scaffolding, and FIG. 1B is a rear view of the temporary opening / closing safety bar for scaffolding shown in FIG. 1A as seen from inside the work scaffolding. [Figure 2] FIG. 2 is a plan view of the temporary opening and closing safety bar for scaffolding shown in FIG. 1B. [Figure 3] FIG. 3 is a vertical cross-sectional elevation view showing details of the pivot support part of the temporary opening / closing safety bar for scaffolding shown in FIG. 1B. [Figure 4] FIG. 4 is an enlarged cross-sectional view taken along line AA in FIG. [Figure 5] FIG. 5 is a vertical cross-sectional elevation view showing details of the pivot support part when the temporary opening / closing safety bar for scaffolding shown in FIG. 1B is opened by 90 degrees toward the inside of the working scaffolding. [Figure 6] FIG. 6 is a partial cross-sectional plan view showing the detailed structure of the safety bar main body. [Figure 7] FIG. 7 is a longitudinal elevation view of a main part showing a first modified example of the structure for incorporating a spring material in the temporary opening and closing safety bar for scaffolding of the present invention. [Figure 8] FIG. 8 is a longitudinal elevational view of the essential parts showing a second modified example of the spring material mounting structure in the temporary opening / closing safety bar for scaffolding of the present invention. [Figure 9] FIG. 9 is a longitudinal elevational view of the essential parts showing a third modified example of the structure for incorporating a spring material in the temporary opening and closing safety bar for scaffolding of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] A preferred embodiment of the present invention will now be described with reference to the accompanying Figures 1 to 6. Reference numeral 1 denotes a temporary opening / closing safety bar for scaffolding constructed based on the present invention, which, as shown in Figures 1B to 3, is composed of a support pipe member 2 oriented vertically up and down, a pipe clamp 3 attached to the side of the support pipe member 2 in order to attach the support pipe member 2 to a vertical steel pipe of the work scaffolding, a movable pipe member 4 inserted into the support pipe member 2 so that it can rotate and move up and down, and a safety bar main body 5 connected to the upper end of the movable pipe member 4 and extending horizontally on one side. The pipe clamp 3 is a conventionally well-known type and is composed of a base member 6 that is bent in an L-shape when viewed from above, an arc-shaped pressure member 8 that is supported on the rising end of the base member 6 by a support shaft 7 so that it can be opened and closed freely, and a fastening bolt nut 10 that is supported on the other end of the base member 6 by a support shaft 9 so that it can swing freely.The fastening bolt nut 10 is closed with the vertical steel pipe sandwiched between the base member 6 and the pressure member 8, and the bolt of the fastening bolt nut 10 is fitted into the bifurcated portion at the free end of the pressure member 8 and the nut is tightened, thereby fastening and fixing the vertical steel pipe between the base member 6 and the pressure member 8.

[0014] A base 11, which is U-shaped in plan view, is welded and fixed to the support pipe 2, and the base member 6 of the pipe clamp 3 is attached to the outer surface of this base 11 with a single bolt and nut 12. To prevent the pipe clamp 3 from rotating freely around the bolt and nut 12, two protrusions 6a and 6b, which are integrally formed by pressing from the bottom surface of the base member 6, fit into two holes provided in the base 11, as shown in Figure 3.

[0015] The safety bar main body 5 is configured to be flexible and retractable, consisting of an outer square pipe member 13, one end of which is fixed to the upper end of the movable pipe member 4, and an inner square pipe member 14, which is fitted in and out of the outer square pipe member 13, and a fixing bolt 15 that passes through the top plate portion near the tip of the outer square pipe member 13 is attached to the top plate portion, and the inner square pipe member 14, pulled out to any position, can be fixed by this fixing bolt 15. In addition, a plate member 16 having a vertical width and projecting from the inner square pipe member 14 on both the top and bottom sides, is provided at the tip of the inner square pipe member 14, with the plate surface oriented vertically.

[0016] 6, a locking means 17 is provided that automatically locks the inner square pipe member 14 to the outer square pipe member 13 when the inner square pipe member 14 is pulled out to its limit relative to the outer square pipe member 13. The locking means 17 comprises a V-shaped leaf spring member 19 with locking pins 18a, 18b attached to the outer surfaces of both ends, pin holes 20a, 20b provided in the left and right side plate portions near the inner end of the inner square pipe member 14, and pin holes 21a, 21b provided in the left and right side plate portions of the outer square pipe member 13 so as to align with the pin holes 20a, 20b when the inner square pipe member 14 is pulled out to its limit relative to the outer square pipe member 13. In the illustrated embodiment, of the pair of locking pins 18a, 18b, only the locking pin 18a on one side is a long locking pin that is long enough to fit from the pin hole 20a in the inner square pipe member 14 to the pin hole 21a in the outer square pipe member 13. Of course, both of the pair of lock pins 18a, 18b may be long lock pins.

[0017] As shown in Figures 3 and 4, a spiral end surface 22 is formed at the lower end of the movable pipe material 4 along the circumferential surface of the movable pipe material 4, and a support roller 24 is attached to the support pipe material 2, which is rotatable around a support axis 23 along the radial direction of the movable pipe material 4 and supports the movable pipe material 4 via the spiral end surface 22.As shown in Figures 1 and 2, when the safety bar main body 5 is in the closed limit position, the support roller 24 is configured to be at the lowest position of the spiral end surface 22 (the position most retracted upward), and when the safety bar main body 5 in this closed limit position opens, the support roller 24 moves relatively from the lowest position of the spiral end surface 22 toward the highest position (the position most protruding downward), so that the movable pipe material 4 and the safety bar main body 5 are pushed up against gravity.

[0018] Specifically, the lower end surface of the movable pipe material 4 is cut so that the end surface which is perpendicular to the circumferential surface of the movable pipe material 4 (perpendicular to the axis) is at a continuous incline of approximately 45° in a side view around the entire circumference, so that the side of the extension direction of the safety bar main body 5 relative to the movable pipe material 4 is at the lowest position (the most upwardly retracted position), and the position 180° away on the opposite side is at the highest position (the most downwardly protruding position), and when the support roller 24 supports the spiral end surface 22 at the lower end of the movable pipe material 4, the circumferential surface of the support roller 24 and the spiral end surface 22 are in contact in a straight line which is parallel to the axis of the support roller 24 and has a length equal to the thickness of the movable pipe material 4. In addition, the support shaft 23 that supports the support roller 24 is threaded into a fixing nut 25 welded to the outer surface of the support pipe material 2 and protrudes integrally from the tip of a bolt 26 that penetrates radially through the peripheral wall of the support pipe material 2, and a small bolt 27 equipped with a backing plate that prevents the support roller 24, which is rotatably fitted onto this support shaft 23, from falling off the support shaft 23 is threadedly fastened to a screw hole provided concentrically on the support shaft 23.

[0019] A support plate 28 is welded to the lower end of the support pipe 2 along the diameter direction, and a through hole is formed in this support plate 28 concentrically with the support pipe 2, and a fixing nut 29 is welded to the inner surface of the support plate 28 concentrically with the through hole. A central shaft 31, formed by a long bolt 30 whose length is close to the distance from the outer surface of the support plate 28 to the top plate portion of the outer square pipe 13 of the safety bar main body 5, is threaded through the fixing nut 29 from the underside of the support plate 28 and inserted approximately concentrically into the movable pipe 4, and the tip of the central shaft 31 is inserted into the outer square pipe 13 of the safety bar main body 5 through a vertical through hole 32 formed concentrically with the movable pipe 4 in the bottom plate portion 13a of the outer square pipe 13 of the safety bar main body 5, which is fixed to the upper end of the movable pipe 4 by welding. At the upper end of this central shaft body 31, a compression coil spring 34 serving as a spring material 33 that urges the movable pipe material 4 and the safety bar main body 5 downward relative to the support pipe material 2 is fitted into the central shaft body 31 between a spring holder 35 using a nut threaded onto the upper end of the central shaft body 31 and the bottom plate portion 13a of the outer square pipe material 13 (safety bar main body 5).

[0020] Therefore, when the support pipe material 2 is held vertically, gravity acting on the movable pipe material 4 and the safety bar main body 5 and the elastic force of the compression coil spring 34 act to lower the movable pipe material 4 and the safety bar main body 5 relative to the support pipe material 2. Therefore, when the support rollers 24 axially supported on the support pipe material 2 are circumferentially separated from the lowest position of the spiral end face 22 at the lower end of the movable pipe material 4, in other words, when the movable pipe material 4 is opened left and right and pushed up by the support rollers 24, a restoring rotational force acts on the movable pipe material 4 relative to the support pipe material 2, and the safety bar main body 5 automatically rotates in a closing direction together with the movable pipe material 4, accompanied by a downward movement centered on the support pipe material 2, to the closed limit position where the support rollers 24 engage with the lowest position of the spiral end face 22, and the safety bar main body 5 stabilizes at the closed limit position.

[0021] 1B and 3, the axis X of the vertical steel pipe (vertical steel pipe 38a in use, described later) gripped by the pipe clamp 3, the axis Y of the support pipe 2, and the central axis Z of the safety bar main body 5 in the closed limit position are located on the same vertical imaginary plane, but the axis Y of the support pipe 2 is not parallel to the axis X of the vertical steel pipe, and the support pipe 2 is tilted by about 2 to 3 degrees in a direction in which the lower end of the support pipe 2 approaches the axis X of the vertical steel pipe. As a result, even without considering the automatic return rotation force to the closed limit position generated by the relationship between the spiral end face 22 at the lower end of the movable pipe 4 and the support roller 24, when the safety bar main body 5 is released after rotating to the left or right from the closed limit position, the gravity acting on the safety bar main body 5 will automatically rotate diagonally downward toward the original closed limit position due to the tilt of the support pipe 2.

[0022] As shown in FIG. 1A , a temporary scaffolding at a construction site is constructed with wall-equivalent framework structures 36 erected on both the left and right sides (or only on the outside) of a worker's passageway and a floor 37 of the worker's passageway inside the wall-equivalent framework structures 36. The wall-equivalent framework structures 36 are constructed from a combination of vertical steel pipes 38 erected at regular intervals and horizontal steel pipes 39 connecting adjacent vertical steel pipes 38, with protective sheet materials such as nets or cloth stretched over them as needed. Between two vertical steel pipes 38 a, 38 b, an opening 40 for workers to enter and exit the worker's passageway floor 37 is secured in the wall-equivalent framework structure 36. Although not shown, a ladder is provided on the outside of the wall-equivalent framework structure 36 to allow workers to ascend and descend between the opening 40 and the ground.

[0023] 1A to 3, the temporary opening / closing safety bar 1 for scaffolding of the present invention, constructed as described above, is erected at an appropriate height above the worker entrance / exit opening 40 of the wall-equivalent framework structure 36. That is, a pipe clamp 3 is fastened to one of the two vertical steel pipes 38a, 38b located on either side of the worker entrance / exit opening 40, for example, the right-hand vertical steel pipe 38a when viewed from the outside, at an appropriate height position, and the inner square pipe member 14 of the safety bar main body 5, which is in the closed-limit position, is moved in and out relative to the outer square pipe member 13 to adjust the overall length of the safety bar main body 5 to a length that allows the tip plate member 16 to be adjacent to the inside of the left-hand vertical steel pipe 38b (the inside of the wall-equivalent framework structure 36), and the inner square pipe member 14 is fixed to the outer square pipe member 13 with the fixing bolts 15. At this time, if the safety bar main body 5 in the closed limit position is attached perpendicular to the movable pipe material 4, the safety bar main body 5 will be tilted downward at the tip by about 2 to 3 degrees relative to the support pipe material 2. However, in this embodiment of the present invention, the angle between the safety bar main body 5 (outer square pipe material 10) and the movable pipe material 4 is set to be about 2 to 3 degrees larger than 90 degrees, so that the safety bar main body 5 in the closed limit position is configured to be in an almost horizontal position.

[0024] 6, the moment the pin holes 21a, 21b of the outer square pipe member 13 overlap the outside of the pin holes 20a, 20b of the inner square pipe member 14, the long lock pin 18a of the pair of lock pins 18a, 18b, which are moving outward due to the elasticity of the V-shaped leaf spring 19, fits into the pin hole 21a of the outer square pipe member 13, preventing further extension of the inner square pipe member 14. To release this locked state and store the inner square pipe member 14 within the outer square pipe member 13, simply press the long lock pin 18a, which is fitted into the pin hole 21a of the outer square pipe member 13, with your fingertip, and store the inner square pipe member 14 within the outer square pipe member 13 in the unlocked state where it is retracted inward from the pin hole 21a of the outer square pipe member 13. In a similar manner, the inner square pipe member 14 can also be removed from the outer square pipe member 13. When the inner square pipe member 14 reaches its maximum retraction position, both the upper and lower ends of the plate member 16 abut against the open end of the outer square pipe member 13, preventing the inner square pipe member 14 from entering further into the outer square pipe member 13.

[0025] Both of the pair of locking pins 18a, 18b may be long locking pins capable of locking, but even if only one of them is a long locking pin, as shown in the figure, if pin holes 20a, 20b are provided in the outer square pipe member 13 so as to match both pin holes 21a, 21b in the inner square pipe member 14, when inserting the V-shaped leaf spring member 19 into the inner square pipe member 14, there is no need to check which of the locking pins 18a, 18b is the long locking pin, and assembly work can be carried out correctly and efficiently.

[0026] According to the temporary opening / closing safety bar 1 for scaffolding of the present invention configured as described above, when no external force is acting on the safety bar main body 5, gravity acting on the movable pipe member 4 and the safety bar main body 5 and the downward elastic force of the compression coil spring 34 cause the support rollers 24 to fit into the lowest position (the position most retracted upward) of the spiral end face 22 at the lower end of the movable pipe member 4, as shown in Figures 3 and 4, i.e., the safety bar main body 5 is stably held in the closed limit position where it is lowest relative to the support pipe member 2. At this time, as shown in Figures 1 and 2, the safety bar main body 5 is in a position horizontally crossing the worker entrance / exit opening 40 of the work scaffolding, and the plate member 16 at the tip of the safety bar main body 5 is adjacent to the inside of the vertical steel pipe 38b on one side of the worker entrance / exit opening 40, so that the safety bar main body 5 cannot open from inside the work scaffolding to the outside. Therefore, even if a worker walking on the floor surface portion 37 of the worker passage within the work scaffold or a worker working on the floor surface portion 37 accidentally leans on the safety bar main body 5 which is in the closed limit position crossing the worker entrance / exit opening 40, there is no risk of the safety bar main body 5 opening and causing the worker to fall or other accidents.

[0027] On the other hand, when a worker enters the work scaffold from the outside via the worker entrance opening 40 using a ladder or the like, the worker can open the safety bar main body 5 toward the work scaffold by pushing the safety bar main body 5, which is in the closed limit position across the worker entrance opening 40, with his or her hand or body toward the inside of the work scaffold. At this time, the opening movement of the safety bar main body 5 occurs when the spiral end surface 22 at the lower end of the movable pipe material 4, which is supported by the support rollers 24 in a fixed position, rotates in conjunction with the rotation of the movable pipe material 4, which rotates integrally with the safety bar main body 5. As a result, the position of the spiral end surface 22 supported by the support rollers 24 moves from the lowest position to the highest position. As a result, as shown in Figure 5, when the safety bar main body 5 opens approximately 90° from the closed limit position, the movable pipe material 4 rotates by approximately half the 180° height movement of the spiral end surface 22 from the lowest position to the highest position, and is pushed up against the downward elastic force of the compression coil spring 34 and the gravity acting on the movable pipe material 4 and the safety bar main body 5.

[0028] When the safety bar body 5 is manually rotated in the opening direction from the closed limit position as described above, the resistance force experienced by the operator during the opening operation, i.e., the resistance force exerted when the spirally inclined spiral end surface 22 at the lower end of the movable pipe member 4 is forced onto the support roller 24 against the downward elastic force of the compression coil spring 34 and the gravity acting on the movable pipe member 4 and the safety bar body 5, acts as a return rotational force that attempts to return the safety bar body 5 to its original closed limit position when the opened safety bar body 5 is released, and the released safety bar body 5 automatically returns to its original closed limit position. At this time, since the movable pipe member 4, which is the rotational axis of the safety bar body 5, is not vertical but is inclined by about 2 to 3 degrees as described above, when the safety bar body 5 is opened from the closed limit position, the safety bar body 5 is subjected to a return rotational force that attempts to return it to its original closed limit position due to the inclination of the rotational axis as described above. In other words, according to the above-mentioned configuration of the present invention, the safety bar main body 5, which is released after opening, can be automatically returned to its original closed limit position reliably by the compression coil spring 34, which acts to increase the gravity acting on the movable pipe material 4 and the safety bar main body 5, and the return rotational force caused by the movable pipe material 4, which is the rotational center axis of the safety bar main body 5, being inclined rather than vertical.

[0029] In the above-described embodiment of the present invention, the length of the compression coil spring 34 that can be used is limited by the internal space of the outer square pipe member 13 in the safety bar main body 5. To solve this problem, as shown in Fig. 7, a large-diameter through-hole 41 can be formed in the bottom plate 13a of the outer square pipe member 13, and a spring retainer 42 with an inverted gate-shaped cross section can be provided that passes through this large-diameter through-hole 41 and enters the movable pipe member 4. The long compression coil spring 34 that passes through the large-diameter through-hole 41 can be fitted onto the central shaft 31 between the spring retainer 42 and the spring retainer 35 consisting of a nut threaded onto the upper end of the central shaft 31. Furthermore, as shown in Fig. 8, the spring retainer 35 at the upper end of the central shaft 31 can be positioned above and outside the outer square pipe member 13 through an opening 13c formed in the top plate 13b of the outer square pipe member 13 in the safety bar main body 5. In this configuration, the required length of compression coil spring 34 can be used without using the inverted gate-shaped cross-section spring holder 42. In this case, it is desirable to use the spring holder 35 exposed to the outside from the opening 13c of the outer square pipe member 13 and the cover member 13d that covers the upper end of the compression coil spring 34. Of course, if necessary, the inverted gate-shaped cross-section spring holder 42 can also be used to enable the use of a longer compression coil spring 34.

[0030] In another embodiment shown in Figure 9, the length of the movable pipe material 4 is increased, and the outer square pipe material 13 of the safety bar main body 5 is attached to the side of the upper end of the movable pipe material 4, a support plate 43 is welded to the upper end of the movable pipe material 4 along the diameter direction, and a fixing nut 44 is welded to the underside of the support plate 43 concentrically with the through hole provided in the center of the support plate 43, and a central shaft body 31 formed by a long bolt 30 is screwed downward through the fixing nut 44 at the upper end of the movable pipe material 4 and penetrates downward through the movable pipe material 4, a spring holder 45 is provided at the lower end of the support pipe material 2 extending below the lower end of the movable pipe material 4, and the central shaft body 31 is passed through this spring holder 45, and a compression coil spring 34 as the spring material 33 can be externally fitted to the central shaft body 31 between this spring holder 45 and a nut-type spring holder 46 at the lower end of the central shaft body 31. As in the previous embodiment, the outer square pipe member 13 of the safety bar main body 5 can also be attached to the upper end of the movable pipe member 4. In this case, the central shaft member 31 can be passed through the outer square pipe member 13 and fixed to the top plate portion of the outer square pipe member 13. Also, in order to enable the compression coil spring 34, which is placed at the lower end of the central shaft member 31, to be positioned as close to the inside of the support pipe member 2 as possible, it is desirable that the spring holder 45 has a gate-shaped cross-section structure that fits inside the support pipe member 2 as shown in the figure.

[0031] It is desirable that the safety bar main body 5 in the present invention be adjustable in length, but it is not limited to one that looks like a single rod. For example, it may be one that uses a strip plate to increase the vertical width, or one that is made up of several pipes aligned in the vertical direction. [Industrial Applicability]

[0032] The temporary opening and closing safety bar for scaffolding of the present invention is installed as a safety measure at the opening for workers to enter and exit a work scaffolding temporarily set up at a construction site, and can be used as a safety bar that can be pushed open by the worker entering or exiting with their hand or body, and can automatically rotate back to the original closed limit position when released by the worker. [Explanation of symbols]

[0033] 1. Temporary opening and closing safety bar for scaffolding 2 Support pipe material 3 pipe clamps 4 Movable pipe material 5 Safety bar body 6 Base material 6a,6b Protrusion 7,9 Support shaft 8 Presser member 10 Fastening bolts and nuts 11 Pedestal 12 bolts and nuts 13 Outer square pipe material 13a Bottom plate part 13b Top plate 13c opening 13d Cover member 14 Inner square pipe material 15 Fixing bolt 16 Board material 17 Locking means 18a, 18b Lock pin 19 V-shaped leaf spring material 20a,20b,21a,21b pin hole 22 Spiral end face 23 Spindle 24 Support roller 25 Fixing nut 26 volts 27 Small bolt 28,43 Support plate 29,44 Fixing nut 30 Long bolt 31 Central shaft body 32 Through hole 33 Spring material 34 Compression coil spring 35, 42, 45, 46 Spring holder 36 Wall-equivalent framework structure 37 Floor of worker passage 38,38a,38b vertical steel pipe 39 Horizontal steel pipe 40 Worker entrance opening 41 Large diameter through hole X: Axis of the vertical steel pipe clamped by the pipe clamp 3 Y: Axis center of support pipe 2 Z: Central axis of safety bar body 5

Claims

1. A temporary opening and closing safety bar for scaffolding is comprised of a support pipe member oriented vertically up and down, a pipe clamp attached to the side of the support pipe member in order to attach the support pipe member to a vertical steel pipe on the scaffolding side, a movable pipe member inserted into the support pipe member so as to be able to rotate and move up and down, and a safety bar main body connected to the upper end of the movable pipe member and extending horizontally on one side, a spring material is provided that urges the movable pipe material and the safety bar main body downward relative to the support pipe material, a spiral end surface is formed at the lower end of the movable pipe material along the circumferential surface of the movable pipe material, a support roller is attached to the support pipe material that is rotatable around a support axis along the radial direction of the movable pipe material and supports the movable pipe material via the spiral end surface, the support roller is configured to be at the lowest position of the spiral end surface when the safety bar main body is in the closed limit position, and when the safety bar main body in this closed limit position opens, the support roller moves relatively from the lowest position to the highest position of the spiral end surface, so that the movable pipe material and the safety bar main body are pushed up against the urging force of the spring material, A temporary opening and closing safety bar for scaffolding, in which when the pipe clamp is fastened to the vertical steel pipe on the scaffolding side, the supporting pipe material is not in a vertical position parallel to the vertical steel pipe, but rather is inclined so that the lower end approaches the vertical steel pipe.

2. 2. A temporary opening / closing safety bar for scaffolding according to claim 1, wherein the safety bar main body is constructed so as to be freely extendable and contractable from an outer square pipe member having one end fixed to the movable pipe member and an inner square pipe member fitted into the outer square pipe member so as to be freely inserted and removed, the outer square pipe member is provided with a fixing bolt for fixing the inner square pipe member at any pulled-out position, and a plate member having an upper and lower width protruding from the tip of the inner square pipe member with the plate surface oriented vertically up and down and protruding on both the upper and lower sides from the inner square pipe member.

3. 3. A temporary opening / closing safety bar for scaffolding as described in claim 1 or 2, wherein a vertical central shaft is provided that passes through the movable pipe material and enters the safety bar main body, the lower end of this central shaft is attached to the lower end of the support pipe material that extends below the lower end of the movable pipe material, and a compression coil spring that serves as the spring material is fitted externally to the central shaft between a spring holder provided at the upper end of the central shaft and the bottom plate portion of the safety bar main body.

4. 4. A temporary opening and closing safety bar for scaffolding as described in claim 3, wherein a large diameter through hole is provided in the bottom plate portion of the safety bar main body, a spring support seat with an inverted gate-shaped cross section is provided which passes through this large diameter through hole and enters into the movable pipe material, and the compression coil spring which passes through the large diameter through hole is fitted externally to the central shaft between the upper end spring support seat of the central shaft body and the inverted gate-shaped cross section spring support seat.

5. 5. A temporary opening and closing safety bar for scaffolding as described in claim 3 or 4, wherein the upper end spring support seat of the central shaft body is arranged outside the safety bar main body through an opening provided in the top plate portion of the safety bar main body.

6. 3. A temporary opening and closing safety bar for scaffolding as described in claim 1 or 2, wherein a central shaft attached to the upper end side of the movable pipe material penetrates through the movable pipe material and passes through a spring support seat provided at the lower end of the support pipe material which passes through the movable pipe material and extends downward from the lower end of the movable pipe material, and a compression coil spring which serves as the spring material is externally fitted on the central shaft body between this spring support seat and the lower end spring support seat of the central shaft body.

7. 7. A temporary opening and closing safety bar for scaffolding as described in claim 6, wherein the safety bar main body is attached to the side of the movable pipe material that protrudes upward from the upper end of the support pipe material, and the upper end of the central shaft body is fixed to the upper end of the movable pipe material.

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