Preceding guard rail holder for a scaffolding system

Abstract

Preceding guardrail holder for a scaffolding system, configured for cooperation with guardrails provided with a fastening hook at a longitudinal end. The preceding guardrail holder includes a first and a second cross connection element extending perpendicular to a mounting plate and a retaining plate, which cross connection elements are mutually spaced apart and together bound a fastening hook receiving space for receiving in the fastening hook receiving space the fastening hook of a first guardrail. The distance between the first and the second cross connection element is such that, if the fastening hook is received in the fastening hook receiving space and the first guardrail is not supported otherwise, a recess on a radial inner side of the fastening hook rests on the first cross connection element, and a radial outer side of the fastening hook abuts against the second cross connection element, the first guardrail thereby being wholly supported by the single preceding guardrail holder.

1 . A preceding-guardrail holder for a scaffolding system comprising standards, ledgers and substantially tube-shaped guardrails, wherein the preceding-guardrail holder is configured for cooperation with the guardrails of the scaffolding system,
 wherein each guardrail at a longitudinal end thereof is provided with a fastening hook which has a curvature around a curvature axis which is perpendicular to a longitudinal axis of the guardrail, wherein the fastening hook on a radial inner side is provided with a recess, wherein the distance of the recess to a point on a radial outer side of the fastening hook gradually increases from a first point on the radial outer side to a second point on the radial outer side of the fastening hook, wherein the second point is more remote from a center of the guardrail than the first point,   wherein the preceding-guardrail holder is provided with a mounting plate and a retaining plate which extends substantially parallel to the mounting plate, wherein the mounting plate and the retaining plate are mutually connected by a first and a second cross connection element extending perpendicular to the mounting plate and retaining plate, wherein the two cross connection elements are mutually spaced apart and together bound a fastening hook receiving space for receiving in the fastening hook receiving space the fastening hook of a first of said guardrails,   wherein the distance between the first and the second cross connection element is such that, if the fastening hook is received in the fastening hook receiving space and the first guardrail is not supported otherwise, the recess on the radial inner side of the fastening hook rests on the first cross connection element and the radial outer side of the fastening hook abuts against the second cross connection element, the first guardrail thereby being wholly supported by the single preceding-guardrail holder.   
     
     
         2 . The preceding-guardrail holder according to  claim 1 , wherein the distance between the first and the second cross connection element is such that, if the first guardrail is supported merely by the preceding-guardrail holder, the first guardrail makes an angle of 20° to 70° with the horizontal. 
     
     
         3 . The preceding-guardrail holder according to  claim 1 , configured for cooperation with a second guardrail of said guardrails, wherein, if the first guardrail extends on a first side of the preceding-guardrail holder and the recess of the first guardrail engages the first cross connection element, the second guardrail extends on a second side of the preceding-guardrail holder and the recess of the second guardrail engages the second cross connection element, wherein the second side of the preceding-guardrail holder is located opposite the first side of the preceding-guardrail holder. 
     
     
         4 . The preceding-guardrail holder according to  claim 3 , wherein the first cross connection element and the second cross connection element are placed at a same height. 
     
     
         5 . The preceding-guardrail holder according to  claim 1 , wherein, if the fastening hook is received in the fastening hook receiving space, the first and the second cross connection element are perpendicular to the longitudinal direction of the first guardrail, parallel to the curvature axis. 
     
     
         6 . The preceding-guardrail holder according to  claim 1 , further provided with a first fastening protection above the fastening hook receiving space, configured for hindering a taking-out of the fastening hook of the first guardrail out of the fastening hook receiving space other than partly by a turning of the first guardrail around the curvature axis. 
     
     
         7 . The preceding-guardrail holder according to  claim 3 , 
 further provided with a first fastening protection above the fastening hook receiving space, configured for hindering a taking-out of the fastening hook of the first guardrail out of the fastening hook receiving space other than partly by a turning of the first guardrail around the curvature axis,   wherein the first fastening protection is also configured for hindering a taking-out of the fastening hook of the second guardrail out of the fastening hook receiving space other than partly by a turning of the second guardrail around the curvature axis.   
     
     
         8 . The preceding-guardrail holder according to  claim 6 , wherein the first fastening protection has a first position in which the first fastening protection hinders a taking-out of the fastening hook out of the fastening hook receiving space other than partly by a turning of the first and possibly second guardrail around the curvature axis, and wherein the first fastening protection has a second position in which the first fastening protection allows taking-out of the fastening hook partly by a translation of the first and possibly second guardrail. 
     
     
         9 . The preceding-guardrail holder according to  claim 3 , further provided with a first fastening protection above the fastening hook receiving space, configured for hindering a taking-out of the fastening hook of the first guardrail out of the fastening hook receiving space other than partly by a turning of the first guardrail around the curvature axis, and 
 further provided with a second fastening protection above the fastening hook receiving space, configured for hindering a taking-out of the fastening hook of the second guardrail out of the fastening hook receiving space other than partly by a turning of the second guardrail around the curvature axis.   
     
     
         10 . The preceding-guardrail holder according to  claim 9 , wherein the second fastening protection has a first position in which the second fastening protection hinders a taking-out of the fastening hook out of the fastening hook receiving space other than partly by a turning of the second guardrail around the curvature axis, and wherein the second fastening protection has a second position in which the second fastening protection allows taking-out of the fastening hook partly by a translation of the second guardrail. 
     
     
         11 . The preceding-guardrail holder according to  claim 6 , wherein the first fastening protection and/or possibly the second fastening protection is a tipping closure. 
     
     
         12 . The preceding-guardrail holder according to  claim 6 , wherein the first fastening protection and possibly the second fastening protection is provided on the mounting plate. 
     
     
         13 . The preceding-guardrail holder according to  claim 1 , wherein the mounting plate is provided with screw holes for the purpose of mounting the preceding-guardrail holder to a standard. 
     
     
         14 . An Asssembly for arranging a temporary preceding guardrail on a scaffolding system comprising standards and ledgers, the assembly comprising a substantially tube-shaped guardrail and a first preceding-guardrail holder according to  claim 1 , wherein the guardrail at a first longitudinal end is provided with a first fastening hook which has a curvature around a first curvature axis which is perpendicular to a longitudinal axis of the guardrail, wherein the first fastening hook on a radial inner side thereof is provided with a recess, wherein the distance of the recess to a point on a radial outer side of the first fastening hook gradually increases from a first point on the radial outer side to a second point on the radial outer side of the first fastening hook, and wherein the second point is more remote from a center of the guardrail than the first point. 
     
     
         15 . The assembly according to  claim 14 , wherein the guardrail at a second longitudinal end thereof is provided with a second fastening hook which has a curvature around a second curvature axis which is parallel to the first curvature axis, wherein the second longitudinal end is located opposite the first longitudinal end of the guardrail and wherein the curvature of the second fastening hook is opposite to the curvature of the first fastening hook, wherein the second fastening hook on a radial inner side thereof is provided with a recess, wherein the distance of the recess to a point on a radial outer side of the second fastening hook gradually increases from a first point on the radial outer side to a second point on the radial outer side of the second fastening hook, and wherein the second point is more remote from a center of the guardrail than the first point. 
     
     
         16 . The assembly according to  claim 14 , further comprising a second preceding-guardrail holder. 
     
     
         17 . The assembly according to  claim 14 , wherein the first fastening hook and possibly the second fastening hook is implemented as a plate-shaped hook. 
     
     
         18 . The assembly according to  claim 17 , wherein the distance between the mounting plate and the retaining plate of the first preceding-guardrail holder and possibly the second preceding-guardrail holder is such that in the fastening hook receiving space two plate-shaped hooks are receivable. 
     
     
         19 . The assembly according to  claim 15 , further comprising a first preceding-guardrail post which on or near an upper side thereof is provided with the first preceding-guardrail holder and at a lower side thereof is configured to be supported by a bracket of the scaffolding system, or a temporary bracket on the scaffolding system, and a second preceding-guardrail post which on or near an upper side thereof is provided with a second preceding-guardrail holder and at a lower side thereof is configured to be supported by a bracket of the scaffolding system, or a temporary bracket on the scaffolding system. 
     
     
         20 . A scaffolding system comprising standards, ledgers and the assembly according to  claim 14 . 
     
     
         21 . A method for arranging a temporary preceding guardrail on a scaffold, the method comprising:
 providing scaffolding parts comprising standards, ledgers and floor parts;   providing the assembly according to  claim 19 ;   building up a first scaffold bay which comprises four standards, at least two transverse ledgers and a floor on a first floor level;   coupling the first preceding-guardrail post to the scaffold bay;   hooking the guardrail by the first fastening hook thereof into the first preceding-guardrail holder;   hooking the second fastening hook of the guardrail into the second preceding-guardrail holder; and   coupling the second preceding-guardrail post to the scaffold bay for placement of a preceding guardrail for the purpose of protection of a second scaffold bay which is above the first scaffold bay.