FR2689561A1 - Ladder to wire. - Google Patents

Abstract

The invention relates to a cable ladder which includes two longitudinal side posts or beams which are kept mutually spaced apart by a number of rungs or rungs which are spaced along the length of the side posts. According to the invention, in order to increase the bending resistance and the resistance to torsion of the ladder to be wired, the lateral uprights (1, 1 ') have lateral reinforcing beads (4, 4') and at the less some of the rungs (3, 3 ') are attached in the area of these beads (4, 4'). The invention applies in particular to ladders.

Description

The present invention relates to a ladder to wire such a ladder

  cabling comprises two longitudinal lateral uprights or beams, often having wings directed outwards and which are held mutually spaced by connecting side members, called rungs or rungs of the ladder, which are distributed spaced along the scale. Usually, the lateral uprights and / or the rungs have cavities to save weight, respectively, to facilitate the fixing of the connections.

  by fastener / bolt to hold cables, tubes, etc. on the ladder.

  Known ladders of this type have the disadvantage of not withstanding the load in their main plane (horizontal plane, before mounting) without becoming oblique Bending resistance and torsion resistance are deficient. Therefore, the object of the present invention is to construct a ladder to be wired of the type indicated, so that its general mechanical and static resistance can be increased substantially by simple and inexpensive means. This objective is achieved by constructing the ladder to be wired so that the side posts have reinforcing beads and at least

  part of the rungs is attached in the area of these beads.

  Thus, according to the invention, the beams of the ladder to be wired have a number of side reinforcing beads or bulbs which are formed directly in the plate material, at least some of the ladder ladders at their ends being welded. to the lateral uprights in the zone

  o are these lateral reinforcing beads.

  By embossing / stamping / stamping these side beads, the flexural strength and torsional strength of the ladder are increased substantially relative to conventional ladders having corresponding dimensions. Further increase in scale strength is obtained. by welding the rungs to two adjacent beads, which makes

  minimum the risk of bending inwards or outwards.

  However, a sufficient increase in strength and stability can only be obtained if, at each level, a bead is assigned to each end or if a single bead exists for each end of a step.

for every second step.

  The invention will be better understood and other purposes, features, details

  and benefits of it will become clearer during the description

  explanatory text which follows with reference to the accompanying schematic drawings given solely by way of example illustrating an embodiment of the invention and in which: FIG. 1 is a perspective view of a portion of a ladder to be cabled constructed according to a embodiment of the present invention, in oblique view from above; and FIG. 2 shows, in plan view, the ladder portion to be wired of the

figure 1.

  The scale to be wired shown in FIGS. 1 and 2 comprises two lateral longitudinal uprights 1, 1 'having lateral restriction wings 2, 2' which are directed towards the outside. The lateral uprights 1, 1 'have, as it is known, a large number of openings which are not essential in the present invention and which, therefore, are not designated by numbers

individual reference.

  The lateral amounts 1, i 'of the scale are mutually maintained

  spaced apart by lateral connecting members in the form of steps 3, 3 '.

  According to the invention, the lateral uprights 1, 1 'have a certain number of lateral beads 4 which are embossed or embossed in the plate material of the lateral uprights 1, 1' and which are distributed along the length of these

  Inward stamping side, these beads are designated by 4 '.

  The lateral beads 4, 4 'in themselves cause a significant increase in flexural strength and torsional strength.

  lateral amounts and consequently the scale.

  According to a preferred embodiment of the invention, the lateral reinforcing beads 4, 4 'are distributed in such a way that pairs of beads on each lateral upright 1, 1' are placed in the zone of the fixing of the steps 3, 3 Thus, in this embodiment, each step 3, 3 'can be welded into the area of two adjacent side beads 4, 4' which

  further increases the resistance and stability of the ladder.

  However, a sufficient increase in the torsional strength / flexural strength of the ladder is obtained when the steps 3, 3 'are welded in the zone of a bead (on each lateral upright or even if only

  some of the steps are welded in the area of these beads).

Claims (3)

  A ladder to be cabled of the type comprising two lateral longitudinal uprights or beams, held mutually spaced by lateral connecting members in the form of rungs or bars which are distributed spaced along the length of said lateral uprights, characterized in that the uprights side members (1, 1 ') have side reinforcing beads (4, 4') and in that at least a portion of the steps (3, 3 ') are attached in the area said beads (4, 4 ').   Wire ladder according to claim 1, characterized in that the reinforcing lateral beads (4, 4 ') are stamped / embossed / embossed in the plate material of the lateral uprights (1, 1') and that the rungs (3, 3 ') are welded to the side posts (1, 1') in the area of the beads (4, 4 ').   3 cable ladder according to claim 2, characterized in that at the welding zone of each step (3, 3 ') on each lateral upright (1, 1') is   assigned at least one reinforcing bead and preferably two (4, 4 ').