FR2927639A1 - SAFETY GUARD - Google Patents

Abstract

The invention relates to a safety railing (1) which can ensure the safety of work without a hook being detached from a flange hole of a strut even in the case where a load is applied downwards. to a horizontal spacer (5). This railing comprises a horizontal spacer (5), two diagonal spacers (6, 7), a locking hook (8) provided at each of the pivotally connecting ends between the horizontal and diagonal spacers, this hook having at its end distal, an insertion piece configured to include a shoulder portion (10) locking preventing the insert from being released by sliding the hole of a flange secured to the strut when the horizontal spacer (5) bends under the effect of a load exerted downwards as a result of, for example, the fall of a worker attached by his safety belt to this horizontal spacer (5) .Application: Tubular scaffolding, etc.

Description

The present invention relates to a safety guard on a construction site that can be progressively extended and which is mounted between props to which flanges having a hole are fixed vertically at predetermined intervals, from a lower scaffolding platform already in place, so as to constitute a railing leading to a higher scaffolding platform to be then put in place, using the flanges having a hole, props, during the construction of a scaffold in a manner such that the props are installed at intervals of installation of scaffold platforms and that each scaffolding platform is installed between struts adjacent to each other.

As shown in FIG. 14 of the accompanying drawings described below, props 2, carrying at regular vertical intervals flanges 4 having a hole, are provided in length and width. A crosspiece 18 is mounted between a front stay and a rear stay 2 of the stays 2 provided in length and width, with the use of the flanges 4 having a hole (see Figure 2 (bl) of the accompanying drawings and described below. after). An inner scaffold platform 3a is installed between a right cross member and a left cross member 18 while supported by both hands by a worker from below (not shown). The worker connects the two ends of a safety railing 1, consisting of a horizontal spacer 5 and a diagonal brace 6, to the flanges 4 having a hole, from below (which is not no more shown) in such a way that the worker holds a lower end of the diagonal brace 6 and engages a hook 5a at an upper end of the diagonal brace 6 by guiding it remotely. Then, as shown in FIG. 14, the worker M mounts on the inner platform 3a of the scaffold and hooks his safety belt R to the horizontal spacer 5 of the safety railing 1, thus ensuring the means 1. In this state, the worker M carries with both hands, from below, a scaffolding platform 3b to be placed above, as shown, and then installs the platform 3b between the crosspieces. 2. Similarly, as shown, the worker attaches from below the two ends of a safety railing 1 consisting of a horizontal spacer 5 and a diagonal spacer 6 to the flanges 4 having a hole, on an upper side, in such a way that a worker maintains a lower end of the diagonal spacer 6 and engages a hook 5a at an upper end of the diagonal spacer 6 by guiding it at a distance.

Even if it appears a situation in which the worker M falls from the lower platform 3a of the scaffold due to an accident, for example if he loses his balance during the work, the worker M is protected by being suspended by the safety belt R which connects the worker M to the horizontal spacer 5 of the guardrail 1 security, which avoids an unforeseen accident. However, in this case, it was necessary to make the structure of the hook 5a, located at one end of the horizontal spacer, relatively complex to allow the hook 5a at the upper end of the diagonal spacer 6 to be engaged in softly being guided remotely at the same time as the worker M holds the lower end of the diagonal strut 6 as described above, while preventing the hook 5a from easily disengaging or sliding from a hole 4a of the flange 4 once the engagement is made, even if an external load is applied to the guardrail as above. This complicated the manufacture of the hook 5a. The invention has been carried out taking into account the preceding circumstances and it is therefore an object of the invention to provide a safety guard with a simple structure, in which the hook can be easily engaged with the flanges having a hole in being guided remotely and the safety of the operations can be ensured without the hook is released by sliding the hole of the flange of the strut even if a load is applied down to the horizontal spacer. To achieve the above object, there is provided a safety railing 1 according to the invention, which can be extended gradually and is mounted between struts 2 to which flanges 4 having a hole 4a are fixed at predetermined vertical intervals , from a lower scaffolding platform 3 already in place, as a guard rail leading to an upper scaffolding platform 3 to be then put in place, by the use of the flanges 4 having a hole 4a was 2 during the construction of the scaffolding in such a way that the struts 2 are set up at platform installation intervals 3 of the scaffolding and that, then, each scaffolding platform 3 is mounted between 2 adjacent to each other, which it connects, which safety railing according to the invention comprises a horizontal spacer 5, two diagonal struts 6, 7 which intersect each other and which are each connected pi one terminal end at both ends of the horizontal spacer 5, respectively, a locking hook 8 located on one end of the horizontal spacer 5 or on one end of the diagonal struts 6 and 7 in each of the pivotally connecting ends between the horizontal spacer 5 and the diagonal spacers 6 and 7, the locking hook 8 having a distal end constituting an insertion piece 9 insertable into the hole 4a of the flange 4 and being withdrawn from above, a shoulder portion 10 on the insertion piece 9, locking at the circumference 4ao of the hole 4 of the flange and preventing the insertion piece 9 from sliding out of the hole 4a by the fact that the horizontal spacer 5 flexes and that the locking hook 8 is moved horizontally when a load is applied downward on the horizontal spacer 5, and an adapter 12 located on the other end of each diagonal spacer 6, 7 and attachable to the flange 4. In accordance with the safety guard of the present invention, the locking hook 8 is located on the end of the horizontal spacer 5 or on the end of the diagonal struts 6, 7 in each of the mounting ends pivoting between the horizontal spacer 5 and the diagonal struts 6, 7. The distal end of the locking hook 8 constitutes the insertion piece 9 which can be inserted into the hole 4a of the flange 4 and be removed from above. The insertion piece 9 is provided with the shoulder portion 10 locking locking to the circumference of the hole 4a of the flange and preventing the insertion piece 9 to slide out of the hole 4a by the fact that the horizontal spacer 5 flexes and the locking hook 8 is moved horizontally when a downward load is applied to the horizontal spacer 5. As a result, when a worker falls off a scaffolding platform because he loses balance and the like while working with his safety belt connected to the horizontal spacer 5, and that the load P of impact exerted downwards is applied to the horizontal spacer 5 via the seat belt, the horizontal spacer 5 flexes and its end is displaced in the horizontal direction H as represented by the virtual line in FIG. 5 (b) of the accompanying drawings and described hereinafter, whereby the shoulder portion The locking member 9 locks at the circumference 4ao of the hole 4a of the flange 4 and prevents the insertion piece 9 from sliding out of the hole 4a. The safety railing can not be detached from the prop 2, which prevents the worker from falling. Other objects will emerge from the following description.

The invention will be described in more detail with reference to the accompanying drawings by way of non-limiting examples and in which: FIG. 1 (a) is a front view of a safety railing according to the present invention; Fig. 1 (b) is an enlarged view of a portion indicated by the arrow A in Fig. 1 (a); Fig. 1 (c) is an enlarged view of a portion indicated by the arrow B in Fig. 1 (a); Fig. 2 (a-1) is a front view showing a state of the safety railing in use, shown in Figs. 1 (a) to 1 (c); Fig. 2 (a-2) is an enlarged view of a portion indicated by the arrow C in Fig. 2 (a-1); Fig. 2 (a-3) is an enlarged view of a portion of indicated by the arrow D in FIG. 2 (a-1); FIG. 2 (b1) is a plan view showing a state of the safety railing in use; Figure 2 (b-2) is an enlarged view of a portion indicated by the arrow E of Figure 2 (b1); Figure 2 (b-3) is an enlarged view of a portion indicated by the arrow F in Figure 2 (b-1); Fig. 3 (a) is an enlarged view of Fig. 1 (b); Figure 3 (b) is an enlarged sectional view along line G-G of Figure 3 (a); Figure 3 (c) is an enlarged sectional view along the line H-H of Figure 3 (a); Fig. 3 (d) is a sectional view similar to that of Fig. 3 (b) showing another example; Figure 3 (e) is a sectional view similar to Figure 3 (c); Figures 4 (a) and 4 (b) are a front view and an enlarged plan view of a mounting area of a fitting, respectively; Figs. 5 (a) and 5 (b) are explanatory diagrams on an enlarged scale showing the operation of the safety railing; Fig. 6 (a-1) is a front view showing a locking hook of another embodiment; Fig. 6 (a-2) is an enlarged view of a portion of Fig. 6 (a -1); Fig. 6 (bl) is a front view showing a locking hook of another embodiment Fig. 6 (b-2) is an enlarged sectional view along the line AA of Fig. 6 (bl) FIG. 7 (a-1) is a front view showing a locking hook of another embodiment; FIG. 7 (a-2) is a sectional view on an enlarged scale along line 1-1 of FIG. FIG. 7 (a1) FIG. 8 (a1) is a front view showing a locking hook of another embodiment FIG. 8 (a-2) is an enlarged sectional view along line KK of FIG. Fig. 8 (a-1) Fig. 8 (b1) is a front view showing a locking hook of another embodiment; Fig. 8 (b-2) is an enlarged sectional view along the line LL of Fig. 8 (b1); Fig. 8 (c-1) is a front view showing a locking hook of another still another embodiment; FIG. 8 (c-2) is an enlarged sectional view along line MM of FIG. 8 (cl) FIG. 8 (d-1) is a front view showing a locking hook of another still another embodiment; Figure 8 (b-2) is an enlarged sectional view taken along line N-N of Figure 8 (d-1); Fig. 9 (a) is an explanatory diagram showing a state in which an insert of the locking hook shown in Figs. 8 (b-1) and 8 (b-2) is inserted into a hole of a flange; Fig. 9 (b) is an explanatory diagram showing the operation of the insert; Figure 10 (a) is a front view of another safety railing according to the present invention; Fig. 10 (b) is an enlarged view of a portion indicated by the arrow O in Fig. 10 (a); Fig. 10 (c) is an enlarged view of a portion indicated by the arrow P on Figure 10 (a); Fig. 11 (a-1) is a front view showing a state of the safety railing in use, shown in Figs. 10 (a) through 10 (b); Fig. 11 (a-2) is an enlarged view of a portion indicated by the arrow Q of Fig. 11 (a-1); Fig. 11 (a-3) is an enlarged view of a portion indicated by the arrow R in Fig. 11 (a1); Fig. 11 (b-1) is a plan view showing a state of the railing safety during use; Fig. 11 (b-2) is an enlarged view of a portion indicated by the arrow S in Fig. 11 (b-1); Fig. 11 (d-3) is an enlarged view of a portion indicated by the arrow T in Fig. 11 (b-1) Fig. 12 (a) is a front view of yet another embodiment of the safety railing according to the present invention; Fig. 12 (b) is an enlarged view of a portion indicated by the arrow U in Fig. 12; (a) Fig. 12 (c) is an enlarged view of a portion indicated by the arrow V on Fig. 12 (a) Fig. 13 (a-1) is a front view showing a state of the safety railing in use, shown in Figs. 12 (a) to 12 (c); Fig. 13 (a-2) is an enlarged view of a portion indicated by the arrow W in Fig. 13 (a-1); Fig. 13 (a-3) is an enlarged view of a portion indicated by the arrow X in Fig. 13 (a-1); Fig. 13 (b-1) is a plan view showing a state of the safety railing in use; Fig. 13 (b-2) is an enlarged view of a portion indicated by the arrow Y in Fig. 13 (b-1); Fig. 13 (b-3) is an enlarged view of a portion indicated by the arrow Z in Fig. 13 (b-1); and Fig. 14 is an explanatory diagram showing a state in the case where scaffolding platforms and safety railings are mounted between a right strut and a left strut.

Preferred embodiments of the present invention will be described below based on the drawings. Figure 1 (a) is a front view of a safety railing 1 according to the present invention. Figure 1 (b) is an enlarged view of a portion indicated by the arrow A in Figure 1 (a). Figure 1 (c) is an enlarged view of a portion indicated by the arrow B in Figure 1 (a). Fig. 2 (a-1) is a front view showing a state of the safety railing 1 in use. Figure 2 (a-2) is an enlarged view of a portion indicated by the arrow C in Figure 2 (a-1). Figure 2 (a-3) and an enlarged view of a portion indicated by the arrow D in Figure 2 (a-1). Fig. 2 (b-1) is a plan view showing a state of the safety railing 1 in use. Figure 2 (b-2) is an enlarged view of a portion indicated by the arrow E in Figure 2 (b-1). Figure 2 (b-3) is an enlarged view of a portion indicated by the arrow F in Figure 2 (b-1). Figure 3 (a) is an enlarged view of Figure 1 (b). Figure 3 (b) is a sectional view on an enlarged scale along the line G-G of Figure 3 (a). Figure 3 (c) is an enlarged sectional view along the line H-H of Figure 3 (a). Figure 3 (d) is a sectional view similar to Figure 3 (b) showing another example. Figure 3 (e) is a sectional view similar to Figure 3 (c). As shown in FIG. 2, the safety railing 1 can be progressively extended and is mounted from a scaffolding platform 3 already in place as shown in FIG. 2 (a1), as a railing leading to an upper platform 3 of the scaffolding to be then put in place, although it is not shown, using flanges 4, having a hole 4a, of props 2 when a tubular scaffold is constructed of such that struts 2, to which flanges 4 having a hole 4a are fixed at predetermined vertical intervals, are set up at intervals of installation of the platforms 3 of the scaffold and that each scaffolding platform 3 is mounted between struts 2 adjacent to each other, it connects. The guardrail 1 safety comprises a horizontal spacer 5 and two diagonal spacers 6, 7 which intersect each other and which have one end pivotally connected to both ends of the horizontal spacer 5 with a set to screw and nut 13 (bolt) respectively (see Figure 3 (a)). The scaffolding platform 3 is mounted between lateral tie rods (18), which it connects, coupled to the flanges 4 of the props 2, adjacent to each other in the direction of the width of the platform 3 of the scaffolding, as schematically shown in Figure 2 (bl). A locking hook 8 is provided at one end of the diagonal spacer 6, 7, respectively at each pivoting attachment end between the horizontal spacer 5 and the diagonal spacers 6, 7 of the guardrail 1 safety. The locking hook 8 at a distal end which constitutes an insertion piece 9 which can be inserted into the hole 4a of the flange 4 and be removed from above. The insertion piece 9 is provided with a shoulder-locking portion 10 for circumferentially locking 4ao of the hole 4a of the flange 4 (see Figs. 5 (a) and 5 (b)) and preventing the insertion piece 9 to slide out of the hole 4a because the horizontal spacer 5a flexes and the locking hook 8 is moved horizontally when a load is applied down to the horizontal spacer 5. A fitting 12, which is known and which can be attached to the flange 4, is located at the other end of each diagonal spacer 6, 7. As shown in FIGS. 2 (b-2), 2 (b-3) and 3 (a) at 3 (c), the locking hook 8 is configured by a flat hook body 14 welded to one end of the diagonal brace 6 and an insert member 9 composed of a weld pin-like body at an extreme distal end of the flat body 14 of the hook so as to project downwardly therefrom, int rigged. The insertion piece 9 includes a small diameter pin portion 9a at an upper side thereof and a large diameter pin portion 9b at a lower side thereof. A shoulder portion 10 of locking is formed between the small and large diameter pin sections 9a and 9b. The large diameter pin portion 9b of the insertion piece 9 has a lower side forming an insertion guide portion 90 which is tapered downwardly. To attach the insertion piece 9 of the locking hook 8 to the flat hook body 14, as in an example shown in FIGS. 3 (b) and 3 (c), an open groove 14 (a), in which the section pin 9a of small diameter of the insertion piece 9 can be adjusted, is formed on the distal end side of the flat hook body 14, and an upper side of the small diameter pin portion 9a is then housed in the open groove 14a. The pin section 9a of small diameter, once housed in the groove, can then be fixed by welding to the zone of the open groove 14a of the body 14 hook. Another way of connecting the insertion piece 9 to the flat hook body 14 is to provide a hole 14o, in which the small diameter pin portion 9a can be adjusted, at the distal end of the flat hook body 14, to from its lower end surface, as shown in Figures 3 (d) and 3 (e), and accommodate the upper portion of the pin portion 9a of small diameter in the hole 14o and solder as appropriate. The fitting 12 which is provided at the other end of each diagonal spacer 6, 7, as shown in FIGS. 4 (a) and 4 (b), comprises a U-shaped frame member 19 which can be hung on the flange 4 of the strut 2, and a wedge-shaped piece 20 wedged from the top of the u-shaped U-shaped frame member 19 which is hooked to the flange 4, penetrating the shaped frame part 19; U returned and in the hole 4a of the flange 4. The U-shaped frame member 19 is connected fixedly or pivotally to the other end of each diagonal spacer 6, 7 via a console 22. To fix the fitting 12, the u-shaped frame member 19 is brought into engagement with the flange 4 of the stay 2, and a wedge 10 is pushed in from the top of the frame piece 19 U-shaped returned so that it enters the upper and lower holes 19a of the frame part 19 and into the hole 4a of the flange 4, as shown.

When using the safety railing 1 configured as described above, a worker standing on the inner platform 3 of the scaffolding has already set up uprights on one side of the diagonal braces 6, maintaining his inner end.

The worker simply drops and inserts the insertion piece 9 of the locking hook 8, located at the upper end of the diagonal spacer 6, in the hole 4a of the flange 4 on one side of the strut 2 which is placed higher than a position of installation of the upper platform 3 of the scaffolding to be put in place then, by guiding it at a distance by looking upwards. After this, the worker sets up the other diagonal spacer 7 guiding it remotely in the same way. To maintain the horizontal spacer 5 in a horizontal orientation, the worker introduces the insertion piece 9 of the locking hook 8, located at the upper end of the diagonal spacer 7, in a hole 4a of a flange 4 2. The two diagonal struts 6, 7 being crossed, the worker fixes the fitting 12 located at the lower end of each diagonal spacer 6, 7 to a flange 4 at a required height of each strut 2, thereby establishing a state as shown in Figs. 2 (a-1) to 2 (b-3). As described above, the insertion piece 9 of the locking hook 8 protrudes perpendicularly downwards, as shown in Figs. 3 (a) through 3 (e). Consequently, the simple fact of bringing down the locking hook 8 carries out the introduction of the insertion piece 9 into the hole 4 (a) of the flange 4 when the worker holds the lower end of the diagonal spacer 6 to engage the insertion piece 9 of the locking hook 8, located at the upper end of the diagonal spacer 6, in the hole 4a of the flange 4 of the prop 2, as shown in FIGS. (a-1) to 2 (b-3). Consequently, even while being remotely guided from below, the insertion piece 9 can easily be inserted into the hole 4a of the flange 4. After the safety railing 1 has been installed between the adjacent props 2 to one another in a longitudinal direction of the platform 3 of the scaffolding, the upper platform 3 of the scaffolding is put in place. This platform 3 is considered to be mounted between lateral tie rods 18, which it connects, connected to the flanges 4 of the struts 2 adjacent to each other in the width direction of the platform 3 of the scaffolding as schematically shown as Figure 2 (bl). FIG. 5 (a) shows a state in which the insertion piece 9 of the locking hook 8 is introduced into the hole 4a of the flange 4 when the safety railing 1 is installed between the adjacent stays 2 in the manner supra. Since the large diameter pin portion 9b of the insertion piece 9 has a lower side forming an insertion guide portion 90 which is tapered downwards, insertion of the insertion piece 9 into the Hole 4a of the flange 4 from the top becomes softer. FIG. 5 (b) shows the operation of the safety railing 1, in particular of the insertion piece 9. When the worker falls off a platform of the scaffolding because he loses his balance or other while working with his seat belt attached to the horizontal spacer 5 and a load P due to a shock is applied downwards to the horizontal spacer 5 through the seat belt, the horizontal spacer 5 flexes and its end is moved in the horizontal direction H as indicated by a mixed line in Fig. 5 (b). As a result, the shoulder portion 10 for locking the insertion piece 9 is locked at the circumference 4ao of the hole 4a of the flange 4 as shown in solid line in Fig. 5 (b), thereby preventing the insert 9 to disengage by sliding from hole 4a. As a result, the guardrail 1 safety can not separate from the prop 2, which prevents the fall of the worker. Although the insertion piece 9 of the locking hook 8 can easily be inserted into the hole 4a of the flange 4 by being remotely guided from below, as described above, the insertion piece 9 engages the circumference 4ao of the hole 4a of the flange 4 reliably and this prevents the insertion piece 9 from sliding out of the hole 4a if the horizontal spacer 5 or the diagonal brace 6, 7 of the safety railing 1 is subjected to a downward load, thereby preventing the guardrail 1 from falling back from the strut 2. This effectively eliminates the risk of unplanned accidents such as a fall of the worker.

Fig. 6 (a-1) is a front view showing a locking hook 8 of another embodiment. Figure 6 (a-2) is an enlarged view of a portion of Figure 6 (a-1). The locking hook 8 is configured by a flat hook body 14 provided in an integrated manner at one end of the diagonal spacer 6, and an insert piece 9 integrally welded to a distal end side of the flat hook body 14. in order to protrude down. The insertion piece 9 includes a small diameter pin portion 9a at an upper side thereof and a large diameter pin portion 9b at a lower side thereof. The large diameter pin portion 9b has a chamfered upper edge, and the chamfered portion is designated 9c. Figure 6 (b-1) is a front view showing a locking hook 8 of another embodiment. Figure 6 (b-2) is an enlarged sectional view taken along line A-A of Figure 6 (b-1). The locking hook 8 has an insertion piece 9 composed of a pin-like body projecting downward from the distal end of the flat hook body 14 to which it is integrally connected by welding. A small diameter pin portion 9a of the upper side is formed by cutting an inner surface on the upper side of the pin-like body to a required thickness. A non-machined area of the lower side is a pin portion 9b of large diameter of lower side. Thus, a stepped shoulder portion 10 is formed between the small diameter pin portion 9a and the large diameter pin portion 9b. In addition, the large diameter pin portion 9b has a lower side forming an insertion guide portion 90 tapered downward. Fig. 7 (a-1) is a front view showing a locking hook 8 of another embodiment. Figure 7 (a-2) is a sectional view on an enlarged scale along line 1- 1 of Figure 7 (a-1). The locking hook 8 comprises a flat hook body 14 provided in an integrated manner at one end of the diagonal spacer 6 and an insertion part 9 composed of a flat part which projects from an extreme distal side of the flat side. 14 hook with which it is made in one piece. A shoulder portion 10 for locking is formed at a required area on an inner end surface of the flat insert member 9. In addition, an insertion guide portion 9e, narrower than the side of the shoulder shoulder portion 10, is formed at the lower side of the shoulder portion 10 of locking. When the insertion piece 9 of the locking hook 8 is successively composed of a flat portion extending integrally from the distal end of the flat hook body 14, the body 14 of the hook and the insertion piece 9 can be formed into a single plate. Manufacturing is simplified. Figure 7 (b-1) is a front view showing a locking hook 8 of another embodiment.

Figure 7 (b-2) is a sectional view on an enlarged scale along the line J-J of Figure 7 (b-1). The locking hook 8 comprises an insertion piece 9 which is also successively composed of a flat portion extending integrally from the distal end of the flat hook body 14 in the same manner as for the locking hook 8 Figures 7 (a1) and 7 (a-2). A shoulder portion 10 of lock is formed in a required area on an inner end surface of the flat insert member 9. In addition, a tapered insertion guide portion 90, narrower than the side of the shoulder shoulder portion 10, is formed at a lower side of the shoulder portion 10 of locking. Fig. 8 (a-1) is a front view showing a locking hook 8 of another embodiment. Fig. 8 (a-2) is an enlarged sectional view along line K-K of Fig. 8 (a-1). The locking hook 8 is configured by a flat hook body 14 provided in an integrated manner at one end of the diagonal spacer 6, and an insertion piece 9 composed of a pin-like body which is welded to one side. Distal end of the flat hook body 14 to project downwards. The insert 9 is a small diameter pin portion 9a at an upper side thereof and a large diameter pin portion 9b at a lower side thereof. A shoulder portion 10 of locking is formed between the small and large diameter pin sections 9a and 9b. The large diameter side pin portion 9b has a lower side forming an insertion guide portion 90 tapered downwardly. In addition, the large diameter pin portion 9b has a chamfered upper edge constituting a chamfered portion 9c. Figure 8 (b-1) is a front view showing a locking hook 8 of another embodiment. Figure 8 (b-2) is an enlarged sectional view along line L-L of Figure 8 (b-1). The locking hook 8 has the same configuration as the locking hook 8 shown in FIGS. 8 (a-1) and 8 (a-2), except that the upper edge of the large lateral diameter pin portion 9b is not chamfered.

Figure 8 (c-1) is a front view showing a locking hook 8 of another embodiment.

Figure 8 (c-2) is an enlarged sectional view along line M-M of Figure 8 (c-1). The locking hook 8 has an insert piece 9 which is also composed of a spindle-like body welded to a distal end side of a flat hook body 14 integrally provided at one end of the diagonal brace. 6, in order to protrude down. A small diameter pin portion 9a of the upper side is formed by cutting a required area on the inner surface, on the upper side of the pin-like body, over a required length and a required vertical depth, and its lower side is consisting of a pin portion 9b of large diameter on the lower side. Thus, a stepped shoulder portion 10 is formed between the small and large diameter pin sections 9a and 9b. In addition, the large diameter pin portion 9b has a lower side forming an insertion guide portion 90 tapered downward. Figure 8 (d-1) is a front view showing a locking hook 8 of another embodiment. Figure 8 (d-2) is an enlarged sectional view taken along line N-N of Figure 8 (d-1). The insertion piece 9 is composed of a pin-like body which is welded to a distal end side of a flat hook body 14 to project downwardly. The spindle-like body has an upper side constituting a small diameter spindle portion 9a and a lower side constituting a large diameter spindle portion 9b, whereupon a stepped shoulder portion 10b is formed between the spindle portion pin 9a of small diameter and the pin portion 9b of large diameter. The large diameter pin portion 9b has a lower half forming an insertion guide portion 90 tapered downwardly. In addition, the large diameter pin portion 9b has an upper edge constituting a chamfered portion 9c.

Fig. 9 (a) shows a state in which the insertion piece 9 of the locking hook 8 shown in Figs. 8 (b1) and 8 (b-2) is inserted into the hole 4a of the flange 4. The figure 9 (b) shows the operation of the insertion piece 9. When a worker falls off a platform of the scaffolding as he loses his balance or other while working with his safety belt attached to the horizontal spacer 5, and that a load P due to a shock is applied downwards to the horizontal spacer 5 via the safety belt, the horizontal spacer 5 flexed and its end is moved in the direction horizontal H as shown in phantom in Figure 9 (b). As a result, the shoulder portion 10 of locking of the insertion piece 9 is locked at the circumference 4ao of the hole 4a of the flange 4, as shown in solid lines in Fig. 9 (b), which prevents the piece from insertion 9 to slide out of the hole 4a. As a result, this guardrail 1 safety can not be detached from the prop 2, which prevents the fall of the worker. Figure 10 (a) is a front view of a safety railing 11 according to the present invention. Fig. 10 (b) is an enlarged view of a portion indicated by the arrow O in Fig. 10 (a). Fig. 10 (c) is an enlarged view of a portion indicated by the arrow P in Fig. 10 (a). Fig. 11 (a-1) is a front view showing a state of the guard rail 11 in use. Fig. 11 (a-2) is an enlarged view of a portion indicated by the arrow Q in Fig. 11 (a-1). Fig. 11 (a-3) is an enlarged view of a portion indicated by the arrow R in Fig. 11 (a-1). Fig. 11 (b-1) is a plan view showing a state of the guard rail 11 in use. Fig. 11 (b-2) is an enlarged view of a portion indicated by the arrow S in Fig. 11 (b-1). Fig. 11 (b-3) is an enlarged view of a portion indicated by the arrow T in Fig. 11 (b-1). In the safety railing 1 shown in FIGS. 1 (a) to 9 (b), the locking hook 8 is provided at one end on the side of the diagonal struts 6, 7 in each of the pivotally connecting ends between the horizontal spacer 5 and the diagonal spacers 6, 7. In the safety railing 11 shown in FIGS. 10 (a) to 11 (b-3), the locking hook 8 is instead provided at one end of the side of the horizontal spacer 5 in each of the pivotally connecting ends between the horizontal spacer 5 and the diagonal spacers 6, 7. More particularly, in the guard rail 11 safety, the horizontal spacer 5 has its two ends connected using attachment pieces 23, respectively. One end of each diagonal brace 6, 7 is pivotally connected by means of a screw and a nut 13 (a bolt) to each attachment piece 23. Each end of the horizontal brace 5 is provided so that built-in 8 locking hook. The locking hook 8 has a distal end forming an insertion piece 9 to be inserted into the hole 4a of the flange 4 and can be removed from above. The insertion piece 9 is provided with a shoulder-locking portion 10 locking at the circumference 4ao of the hole 4a of the flange 4 and preventing the insertion piece 9 from sliding out of the hole 4a by means of a bending of the horizontal spacer 5 and a horizontal displacement of the locking hook 8 when a load is applied downwards to the horizontal spacer 5. The other end of each diagonal spacer 6, 7 is provided with a fitting 12 which can be fixed to the flange 4. Each locking hook 8 has the same structure as that shown in Figures 3 (a) to 3 (c). The fitting 12 has the same structure as that shown in Figures 4 (a) and 4 (b).

Figure 12 (a) is a front view of a safety railing 21 according to the present invention. Fig. 12 (b) is an enlarged view of a portion indicated by the arrow U in Fig. 12 (a). Fig. 12 (c) is an enlarged view of a portion indicated by the arrow B in Fig. 12 (a). Fig. 13 (a-1) is a front view showing a state of the guard rail 21 in use. Fig. 13 (a-2) is an enlarged view of a portion indicated by the arrow W in Fig. 13 (a-1). Fig. 13 (a-3) is an enlarged view of a portion indicated by the arrow X in Fig. 13 (a-1). Fig. 13 (b-1) is a plan view showing a state of the guard rail 21 in use. Fig. 13 (b-2) is an enlarged view of a portion indicated by the arrow Y in Fig. 13 (b-1). Fig. 13 (b-3) is an enlarged view of a portion indicated by the arrow Z in Fig. 13 (b-1). In the guardrail 21 represented here, a locking hook 8 is provided at one end of the side of the horizontal spacer 5 in each of the pivotally connecting ends between the horizontal spacer 5 and the diagonal struts 6, 7, in the same way as for the safety railing 11 shown in Figs. 10 (a) to 11 (b-3). Each locking hook 8 has the same structure as that shown in Figures 8 (b-1) and 8 (b-2). According to the invention, on the one hand, the insertion piece 9 can therefore be configured to comprise a pin-like body provided to project at a distal end side of a flat hook body 14 and formed of to include a shoulder portion 10 for locking between a small diameter pin portion 9a at an upper side thereof and a pin portion 9b of large diameter at an upper side thereof.

In accordance with the invention, too, the large diameter pin portion 9b may have a chamfered upper edge 9c. Also in accordance with the invention, the large diameter pin portion 9b may have a lower side formed to include a downwardly tapered insertion guide portion 90, whereby the insert piece 9 can be inserted. more smoothly from above in the hole 4a of the flange 4.

According to the invention also, the insertion piece 9 can be configured so that a small diameter pin portion 9a on the upper side is formed by cutting a required area on an inner surface on the upper side. the spindle-like body so as to protrude from the distal end of the flat hook body 14 to a required depth, and a lower side than the small diameter spine section 9a from the upper side is formed in a large diameter pin portion 9b, on the lower side, so that a shoulder portion 10 of locking is formed between the pin portion 9a of small diameter and the pin portion 9b of large diameter. In accordance with the invention also, the insertion piece 9 may be configured to be a flat portion extending integrally from a distal end side of a flat hook body 14 and formed to have a portion shouldered shoulder 10 at a required area on an inner end surface thereof.

According to the invention also, the insertion piece 9 may be formed to include a narrower guide portion 9e of insertion to a lower side of the shoulder portion 10 of locking, whereby the piece 9 of insertion can be introduced more smoothly into the hole 4a of the flange 4, from above.

Also according to the invention, the fitting 12 can be configured by a U-shaped frame member 19 which can be hooked to the flange 4, and by a corner piece 20 pushed in from the top of the frame part. 19 hooked to the flange 4, so as to enter the U-shaped frame member 19 returned and in the hole 4a of the flange 4. It goes without saying that many modifications can be made to the security railing described and shown in depart from the scope of the invention.

Claims (8)

1. Safety railing (1; 11; 21) which can be progressively extended and is mounted between props (2) to which flanges (4) having a hole (4a) are fixed at predetermined vertical intervals, starting from a lower platform (3a) of scaffolding already installed, so as to constitute a guard rail leading to an upper platform (3b) scaffolding to be then implemented, using the flanges, having a hole, props , when constructing a scaffold in such a way that the struts are installed at intervals of scaffolding platform installation and that each scaffolding platform is installed between adjacent struts one to the other. the other, the safety railing being characterized in that it comprises: a horizontal spacer (5); two diagonal braces (6, 7) which cross each other and are pivotally connected at one end to both ends of the horizontal brace, respectively; a locking hook (8) located at one end of the horizontal spacer or at one end of the diagonal struts in each of the pivotal attachment ends between the horizontal spacer and the diagonal braces, the locking hook having a distal end constituting an insertion piece (9) which can be inserted into the hole of the flange and removed from above; a shoulder portion (10) of locking located in the insertion piece, locking at a circumference of the hole of the flange and preventing the insertion piece from sliding out of the hole due to bending of the horizontal spacer and horizontal movement of the locking hook when a load is applied downward to the horizontal spacer; anda fitting (12) at the other end of each diagonal spacer and attachable to the flange. Safety guardrail according to claim 1, characterized in that it comprises a flat hook body (14), and in that the insert (9) is composed of a spindle-like body provided at a distal end of the flat hook body and having a small diameter spindle section (9a) at an upper side thereof and a large diameter spindle section (9b) at a lower side thereof. ci, thus forming a shoulder portion (10) of locking between the spindle sections of small diameter and large diameter. Safety guardrail according to claim 2, characterized in that the spindle section of large diameter has a chamfered upper edge (9c). Safety guardrail according to one of Claims 2 and 3, characterized in that the large diameter spindle section has a lower side formed so as to have a tapered insertion guide portion (9o). the bottom. Safety guardrail according to one of Claims 2 to 4, characterized in that the insert is composed of a spindle-like body projecting from the distal end of the flat body (14). of a hook and having a required area on an inner surface at an upper side thereof, the area being cut-machined to a required depth, thereby forming a small diameter pin portion (9a) on the upper side and forming a a lower side than the small diameter spindle section, a spindle section (9b) of larger diameter on the lower side, so that a stepped shoulder portion (10) is formed between the spindle section of small diameter and the spindle section of large diameter. 6. Safety railing according to claim 1, characterized in that it comprises a flat body (14) decrochet and in that the insert is composed of a flat portion extending in an integrated manner from a distal end side of the flat hook body and a required area on an inner end surface of this flat portion is formed to include a shoulder portion (10) locking. 7. Safety railing according to claim 6, characterized in that the shoulder portion (10) of locking comprises a lower side formed to include a narrower portion (9e) insertion guide. 8. Safety guardrail according to any one of the preceding claims, characterized in that the fitting (12) comprises a U-shaped frame piece (19) returned, capable of hooking to the flange, and a wedge piece (20) driven from the top of the frame member, hooked to the flange, to penetrate into the U-shaped frame member returned and into the hole (4a) of the flange.