EP3656967A1 - Sliding safety ladder for working at height against a façade or a post - Google Patents

Abstract

The invention relates to a sliding safety ladder (1) for working at great height, composed of at least one upper plane (4) slidably mounted on a lower plane (5), each formed by uprights (6) connected by bars (7), the upper plane (4) comprising support means (8) on a facade (3) or on a post (2). According to the invention, the ladder (1) comprises a plate (9 ) securing fixed between the two uprights (6) of the upper plane (4), against the last bar (7a), on the side opposite to the support means (8) and along a plane intended to be substantially vertical when the ladder (1) bears against the front (3) or the post (2), the plate (9) has means for securing a user by means of a lifeline.

Description

TECHNICAL AREA

The present invention relates to the technical field of sliding safety ladders for working at high height, and particularly relates to such a ladder designed to perform work at high height selectively against a facade or a post.

PRIOR ART

It is known from the state of the art of sliding ladders composed of at least one upper plane mounted to slide on a lower plane, each of the planes being formed by uprights connected by bars, and intended to be used for working at height. , for example on poles, or facades, supporting, for example, electrical or communication equipment.

In practice, this type of ladder comes to rest on the post or the facade, and does not offer optimal security for the user, since the latter has no fixed point of securing to ensure.

STATEMENT OF THE INVENTION

One of the aims of the invention is therefore to propose a sliding safety ladder for working at great height, which adapts as well to bear on a post as on a facade, and which presents optimum safety in use. .

To this end, a ladder has been developed comprising at least one upper plane mounted sliding on a lower plane, each formed by uprights connected by bars, with the upper plane comprising support means on a facade. or on a pole.

According to the invention, the ladder comprises a securing plate fixed between the two uprights of the upper plane, against the last bar, on the side opposite the means support and according to a plane intended to be substantially vertical when the scale is supported against the facade or the post, the plate has means for securing a user by means of a lifeline.

According to a first particular embodiment, the means for securing a user are in the form of an orifice centered laterally to allow the user to be hooked by means of the lifeline when the ladder is used in front support.

According to a second embodiment, taken individually or in combination with the first embodiment, the means of securing a user are in the form of means, which the plate presents, for the passage of a sling of hooking to the pole and fixing to a lifeline. For example, the means for the passage of the sling are in the form of two tongues vertically extending the plate, folded orthogonally relative to the plate in the direction of the support means of the ladder, and each having an orifice for the attachment of a carabiner for the passage of the sling. This second embodiment makes it possible to stabilize the ladder as much as possible by pressing on a post.

According to a particular embodiment, two upper fins and two lower fins extend laterally the plate and are folded orthogonally with respect to the plate in the direction of the support means of the ladder, each of the fins being fixed laterally to the uprights in order to secure the plate on the uprights of the ladder.

Preferably, the plate comprises two pads each having a layer of elastomeric material, the two pads being arranged in a V to receive the post in support in the hollow of the V.

Advantageously, two tongues are cut from the main plane of the plate and are folded back on the bar side to bear under said bar. In this configuration, the upper plane preferably comprises an additional bar, disposed near the last bar, to grip the tabs between said last bar and the additional bar.

Advantageously, and when the ladder is intended to come into abutment against a facade, said ladder comprises two telescopic stabilization legs articulated relative to each other to present a deployed stabilization position in X. The legs each have a lower end of support on the ground, advantageously equipped with a load distribution cup, and an upper end fixed, for example, on the penultimate bar of the upper plane of the ladder. The X-shaped legs, that is to say crossed, make it possible to absorb the dynamic forces generated during the fall of an insured person by means of the lifeline.

According to a particular embodiment, the uprights of the lower plane each comprise a cleat intended to receive in engagement the end of a tensioning cord connected to the post or to the stabilization legs.

Advantageously, and in the configuration for pressing against a pole, the ladder comprises an anchoring system to a lower portion of the pole, the anchoring system being connected to the sling by a connecting strap.

According to a particular embodiment, the anchoring system is an anchoring strap intended to be tied around the post.

Preferably, the ladder comprises a traction and tensioning system, connected on the one hand to the anchoring strap and, on the other hand to the connecting strap. In this way, after tensioning, the efforts of the ladder are taken up at the foot of the post.

The traction and tensioning system is, for example, in the form of a pawl comprising, advantageously, a visual indicator that a certain tension has been exceeded between the anchoring strap and the connecting strap.

Preferably, the orifice of the securing plate comprises a transverse bar breakable under a certain pressure exerted by a lifeline, in order to produce a fall indicator for the user.

SUMMARY DESCRIPTION OF FIGURES

• [Fig.1] la figure 1 est une représentation schématique en perspective de l'échelle selon l'invention, en appui contre un poteau
• [Fig.2] la figure 2 est une représentation schématique en perspective de l'échelle en appui contre une façade, avec des jambes en X ;
• [Fig.3] la figure 3 est une représentation schématique en perspective de la platine d'assujettissement, vue avant ;
• [Fig.4] la figure 4 est une représentation schématique similaire à celle de la figure 3, en vue arrière ;
• [Fig.5] la figure 5 est une représentation schématique, vue avant de l'extrémité supérieure du plan supérieur de l'échelle, avec la platine fixée entre les montants au niveau du dernier barreau ;
• [Fig.6] la figure 6 est une représentation schématique similaire à celle de la figure 5, vue arrière ;
• [Fig.7] la figure 7 est une représentation schématique similaire à celle de la figure 5, sans les patins en élastomère ;
• [Fig.8] la figure 8 est une représentation schématique similaire à celle de la figure 7, sans le support des patins en élastomère ;
• [Fig.9] la figure 9 est une vue de détail de la fixation de l'échelle à un poteau au moyen d'une élingue, tel qu'illustrée à la figure 1 ;
• [Fig.10] la figure 10 est une vue similaire à celle de la figure 9, l'échelle étant vue en coupe longitudinale ;
• [Fig.11] la figure 11 est une représentation schématique et en perspective de l'échelle selon l'invention, en appui contre un poteau, avec la platine équipée de l'élingue pour l'accrochage au poteau, laquelle est reliée à une sangle de liaison, connectée à un système de traction et de mise en tension, lui-même connecté à une sangle d'ancrage au pied du poteau ;
• [Fig.12] la figure 12 est une représentation schématique illustrant en détail la platine équipée de l'élingue pour l'accrochage au poteau, laquelle est reliée à la sangle de liaison ;
• [Fig.13] la figure 13 est une représentation schématique illustrant en détail le système de traction et de mise en tension, connecté d'une part à la sangle d'ancrage au pied du poteau et, d'autre part à la sangle de liaison.

Other advantages and characteristics will emerge more clearly from the description which follows, given by way of nonlimiting example, of the scale according to the invention, from the appended drawings in which:

• [ Fig. 1 ] the figure 1 is a schematic perspective representation of the ladder according to the invention, in abutment against a post
• [ Fig. 2 ] the figure 2 is a schematic perspective representation of the ladder resting against a facade, with X-shaped legs;
• [ Fig. 3 ] the figure 3 is a schematic perspective view of the securing plate, front view;
• [ Fig. 4 ] the figure 4 is a schematic representation similar to that of the figure 3 , in rear view;
• [ Fig. 5 ] the figure 5 is a schematic representation, front view of the upper end of the upper plane of the ladder, with the plate fixed between the uprights at the level of the last bar;
• [ Fig. 6 ] the figure 6 is a schematic representation similar to that of the figure 5 , back view ;
• [ Fig. 7 ] the figure 7 is a schematic representation similar to that of the figure 5 , without the elastomer pads;
• [ Fig. 8 ] the figure 8 is a schematic representation similar to that of the figure 7 , without the support of the elastomer pads;
• [ Fig. 9 ] the figure 9 is a detail view of the attachment of the ladder to a pole by means of a sling, as illustrated in the figure 1 ;
• [ Fig. 10 ] the figure 10 is a view similar to that of the figure 9 , the scale being seen in longitudinal section;
• [ Fig. 11 ] the figure 11 is a schematic and perspective representation of the ladder according to the invention, in abutment against a post, with the plate equipped with the sling for attachment to the post, which is connected to a connecting strap, connected to a system traction and tensioning, itself connected to an anchor strap at the foot of the post;
• [ Fig. 12 ] the figure 12 is a schematic representation illustrating in detail the plate equipped with the sling for attachment to the post, which is connected to the connecting strap;
• [ Fig. 13 ] the figure 13 is a schematic representation illustrating in detail the traction and tensioning system, connected on the one hand to the anchoring strap at the foot of the post and, on the other hand to the connecting strap.

DETAILED DESCRIPTION OF THE INVENTION

With reference to Figures 1 to 13 , the invention relates to a sliding safety ladder (1) for working at great height. With reference to figures 1 and 2 , this type of ladder (1) is commonly used for interventions on poles (2), such as electrical or communication poles, or on facades (3) of buildings for example.

In general, this type of ladder (1) is composed of at least one upper plane (4) slidably mounted on a lower plane (5). Each plane is formed by uprights (6) connected by bars (7). Of course, the ladder (1) can be made up of more than two sliding planes depending on the height of the work to be carried out.

When the ladder (1) is put in place, the upper plane (4) comes to bear against the post (2) or the facade (3), and for this purpose comprises suitable support means (8) .

With reference to figures 3 and 4 , and in order to guarantee the safety of a user, the ladder (1) comprises a securing plate (9) having means for securing a user by means of a lifeline (not shown). More specifically, and with reference to Figures 5 to 8 , the securing plate (9) is fixed between the uprights (6) of the upper plane (4) at the level and against the last bar (7a), on the side opposite the support means (8) against the facade (3 ) or the post (2). The plate (9) is fixed and oriented so that it is intended to form a substantially vertical plane when the ladder (1) is in abutment against the facade (3) or the post (2). In practice, the plate (9) forms an inclined plane of about 20 ° relative to the uprights (6) of the scale (1).

The plate (9) is in the form of a profiled metal plate, having a main plane (9a), preferably perforated. Two upper fins (10) and two lower fins (11) extend laterally the plate (9) and are folded orthogonally with respect to the plate (9) in the direction of the support means (8) of the ladder (1). Each of fins (10, 11) is fixed laterally to the corresponding upright (6). Two tabs (12) are cut from the main plane (9a) of the plate (9) and are folded up on the side of the bar (7a) to bear under the last bar (7a). With reference to figures 6 and 8 , the upper plane (4) comprises an additional bar (7b), fixed near the last bar (7a), to grip the tabs (12) between said last bar (7a) and the additional bar (7b).

According to a first embodiment, the means for securing a user are in the form of a lower orifice (13) formed on the main plane (9a) of the plate (9). The orifice (13) is centered laterally to allow the user to be hooked by means of a lifeline and a carabiner for example. The orifice (13) of the securing plate (9) comprises a transverse bar (13a) breakable under a certain pressure exerted by the lifeline, in order to produce a fall indicator for the user.

With reference to figures 6 to 10 , the uprights (6) of the upper plane (4) each comprise, at their end, a roller (14) to form the support means (8) on a facade (3). The axis of rotation of the rollers (14) is parallel to the axis of the bars (7) of the ladder (1).

When the ladder (1) is intended to come into abutment against a facade (3), said ladder (1) comprises, in a known manner, two telescopic stabilizing legs (15) articulated with respect to the 'other to present a deployed position of stabilization in X. The legs (15) each have a lower end of support on the ground, advantageously equipped with a cup (28) of load distribution, and an upper end fixed removably , for example, on the penultimate bar (7) of the upper plane (4) of the ladder (1).

Preferably, the ladder (1) comprises at its lower end a compensating stabilizer (29) in the shape of an inverted V, the two branches of which, carrying lockable sliding legs, are fixed to the last bar and are connected to the corresponding upright by fittings. Advantageously, each branch is equipped, in the lower part, with a cup (28) for repairing the loads.

With reference to the figure 5 , and in order to be able to bear against a post (2), the plate (9) also comprises two pads (16) each having a layer of elastomeric material, and arranged angularly with respect to each other to form a V and receive in support the post (2) in the hollow of the V. More precisely and with reference to the figures 5 and 7 , the pads (16) are fixed on a support (17) in V, fixed to the plate (9). The support (17) is in particular positioned in abutment against the last bar (7a) of the upper plane (4) of the scale (1) and is fixed to the plate (9) for example by means of three screws ( 17a), see figures 6 and 7 , passing between the last bar (7a) and the additional bar (7b) to be fixed to the plate (9). In this way, the last bar (7a) and the additional bar (7b) are taken in a vice between the plate (9) and the support (17) in V.

In this configuration of support against a post (2), and according to a second embodiment, taken individually or in combination with the first embodiment, the means of securing a user are in the form of means ( 18) for the passage of a sling (21) for attachment to the post (2) and for attachment to a lifeline, see figure 9 . The means are of any suitable type. For example, the plate (9) comprises two tabs (19) vertically extending the plate (9), folded orthogonally to the main plane (9a) of the plate (9) and each having an orifice (20) for fixing 'a carabiner for the passage of the sling. According to a particular embodiment, these are the upper lateral fins (10) which are extended vertically by two L-shaped tabs (19), which are folded orthogonally inwards. More precisely, after folding, the free end of each of the tongues (19) is located near the main plane (9a) and is folded and fixed thereon. Thus, it is the intermediate portion of each tongue (19), which is in a plane orthogonal to the main plane (9a) of the plate (9), and which has the orifice (20) for fixing the carabiner for the passage of the sling (21).

With reference to figures 11 to 13 , and according to a particular embodiment, the sling (21) can be connected to a connecting strap (22) which is stretched along the post (2) and which is connected to a traction system (23) and tensioning device, in the form of a ratchet. The pawl (23) is connected, on the other hand, to an anchoring system (24) in the form of an anchoring strap intended to be tied around the post (2). Of this In this way, the tensioning of the pawl (23) makes it possible to tension the anchoring strap (24), the connecting strap (22) and the sling (21), and makes it possible to firmly hold the end of the upper plane ( 4) of the ladder (1) against the post (2), and of taking up the efforts of the ladder (1), in particular the forces exerted on the plate (9) in the event of the user falling, directly at the level of the base of the post (2).

Preferably and with reference to the figure 10 , the pawl (23) includes a visual indicator (25) that a certain tension has been exceeded between the anchoring strap (24) and the connecting strap (22) to allow the user to adjust the tension so that adequate.

Whether in front support (3) or post support (2), to put the ladder (1) in tension and improve safety of use advantage, the uprights (6) of the lower plane (5) each include a cleat cleat (26) intended to receive in engagement the end of a tensioning cord (27). This tensioning cord (27) is intended to be connected to the post (2) or to the stabilization legs (15), and to be tensioned.

From the above, the invention allows the ladder (1) according to the invention to have a fixed anchoring point making it possible to provide a user, both for using the ladder (1) in post support (2) than front support (3). The plate comprises for this purpose tabs (19) folded and in which are formed orifices (20) allowing the passage of a sling, and an orifice (13) centered laterally, so that the user can, as desired, attach a lifeline either to the orifice (13) or to a sling passed through the orifices (20) of the tabs (19), depending on whether the ladder is in abutment against a wall or a facade.

Claims (12)

Safety sliding ladder (1) for working at great height, composed of at least one upper plane (4) slidingly mounted on a lower plane (5), each formed by uprights (6) connected by bars (7), the upper plane (4) comprising support means (8) on a facade (3) or on a post (2), characterized in that it comprises a plate (9) securing fixed between the two uprights (6) of the upper plane (4), against the last bar (7a), on the side opposite to the support means (8) and according to a plane intended to be substantially vertical when the ladder (1) is in abutment against the facade (3 ) or the post (2), the plate (9) has means for securing a user by means of a lifeline. Ladder (1) according to claim 1, characterized in that it comprises telescopic stabilization legs (15) articulated relative to each other to present a deployed stabilization position in X, the legs (15) have each a lower end of support on the ground, preferably equipped with a cup (28) for distributing the loads, and an upper end detachably fixed on a bar (7) of the upper plane (4) of the ladder ( 1). Ladder (1) according to one of the preceding claims, characterized in that the means for securing a user are in the form of an orifice (13) centered laterally to allow the user to be hooked by means of the lifeline. Ladder (1) according to one of the preceding claims, characterized in that two upper fins (10) and two lower fins (11) extend laterally the plate (9) and are folded orthogonally with respect to the plate (9) in the direction support means (8) of the ladder (1), each of the fins being fixed laterally to the uprights (6). Ladder (1) according to one of the preceding claims, characterized in that the plate (9) comprises two pads (16) having a layer of elastomeric material, the two pads (16) being arranged in a V to receive the post in support (2) in the hollow of the V. Ladder (1) according to one of the preceding claims, characterized in that the means for securing a user are in the form of means, which the plate (9) has, for the passage of a sling (21) for attachment to the pole (2) and attachment to a lifeline. Ladder (1) according to claim 6, characterized in that the means for the passage of the sling are in the form of two tongues (19) extending vertically the plate (9), folded orthogonally to the plate (9 ) towards the support means (8) of the ladder (1), and each having an orifice (20) for fixing a carabiner for the passage of the sling (21). Ladder (1) according to one of the preceding claims, characterized in that two tongues (12) are cut from the main plane (9a) of the plate (9) and are folded up on the side of the bar (7) to bear under the last bar (7a). Ladder (1) according to claim 8, characterized in that the upper plane (4) comprises an additional bar (7b), disposed near the last bar (7a), to grip the tabs (12) between said last bar (7a ) and the additional bar (7b). Ladder (1) according to one of the preceding claims, characterized in that the uprights (6) of the lower plane (5) each comprise a cleat cleat (26) intended to receive in engagement the end of a setting cord tension (27) connected to the post (2) or to legs (15) of stabilization that includes the scale (1). Ladder (1) according to one of the preceding claims, characterized in that it comprises at its lower end a compensating stabilizer (29) in the form of an inverted V, the two branches of which, carrying lockable sliding legs, are fixed to the last bar and are connected to the corresponding upright by fittings. Ladder (1) according to one of the preceding claims, characterized in that the orifice (13) of the fixing plate (9) comprises a transverse bar (13a) breakable under a certain pressure to produce a drop indicator. the user.

Images