FR2946374A1 - Base body for rolling scaffolding structure, has retaining unit having anti-lifting hook portion extended below bottom face of bar with which retaining unit is gripped in utilization configuration of rolling scaffolding - Google Patents

Abstract

The body (6) has a complementary retaining unit i.e. anti-lifting hook (9), forming a retaining stop (10) during displacement parallel to ladders (2) in a spacing direction of the ladders and in a connection direction of the ladders. The retaining unit is arranged in a fixed manner or at a proximity of ends of girders (7) for coupling the corresponding end of each girder to a bar (4) of each ladder. The retaining unit has an anti-lifting hook portion (9A) extended below a bottom face (4A) of the bar with which the retaining unit is gripped in utilization configuration of a rolling scaffolding. Independent claims are also included for the following: (1) a rolling scaffolding structure comprising a base body (2) a method for assembling a rolling scaffolding structure.

Description

The present invention relates to a basic body for producing a scaffolding scaffolding frame, a scaffolding frame incorporating such a base body and a method of mounting said frame.

It relates more particularly to a basic body of the type comprising at least two longitudinal members positionable between two ladders equipped with wheels, and couplable to said ladders for the realization of a rolling scaffolding frame, each spar of the base body being, for maintenance a ladder in the erected state in a position called use configuration of the scaffold in which the amounts of the ladder connected to the base body extend substantially perpendicular to the longitudinal members of the base body, equipped with, or in the vicinity of, each of its ends of at least two retaining members formed one, at least one hook adapted to engage a bar of a ladder for the coupling of the spar to scale the other, a stop said retaining stop adapted to abut against an amount of the ladder in an area of the amount extending above or below the bar in engagement with said hook, said orga retaining nests, said complementary action being, in the configuration of use of the scaffolding, able to form one abutment, during a displacement parallel to themselves scales in the direction of a spacing, the other, when moving parallel to themselves scales in the sense of a rapprochement of said scales.

A scaffold incorporating such a base body is known from FR-2,854,914. This patent describes a simplified structure scaffold in which the connection of the hook to a bar or ladder step is operated by means of a locking point. Indeed, the hook affects the shape of an inverted U coming to be positioned astride a step of the scaffolding. This hook is kept in engagement with the step by means of the locking point articulated to the soul of the U, this comma being supported under said scale step. The opening in the direction of the ground of the hook is obligatory to allow it to come into engagement with the ladder rung because the retaining stop is supported on the amount on either side of the ladder rung so that that any angular displacement of the scale around the crooked bar is prevented. This design requires the presence of an articulated locking member formed here by the locking point. The disadvantage of this solution lies in the fact that, as the scaffolding is a rolling scaffolding, there is a risk that the comma will hit an obstacle during the displacement of the scaffolding on the ground and will, under the effect of this shock, from a locked position to an unlocked position without the operator noticing. The assembly is then no longer secure and the hooks of the base body may, inadvertently, disengage from the bars of the ladders.

An object of the present invention is therefore to provide a base body and a scaffolding scaffolding frame incorporating such a base body whose design avoids any risk of inadvertent separation of the base body from the rest of the frame without harming the simplicity of editing.

For this purpose, the subject of the invention is a basic body of the type comprising at least two longitudinal members which can be positioned between two ladders equipped with wheels, and which can be coupled to said ladders for producing a rolling scaffolding frame, each spar of the body. base being, for the maintenance of a ladder in the erected state in a position called use configuration of the scaffold in which the amounts of the ladder connected to the base body extend substantially perpendicular to the longitudinal members of the body base, equipped at or near each of its ends with at least two retaining members formed of at least one hook adapted to engage a bar of a ladder for coupling from the spar to the ladder, the other, a stop said retaining stop adapted to abut against a ladder amount in a zone of the amount extending above or below the bar in mesh with said hook, said org retaining anes, said complementary action, being, in use scaffolding configuration, able to form one stop, during a displacement parallel to themselves scales in the direction of a spacing, the other, when moving parallel to themselves scales in the sense of a rapprochement of said scales, characterized in that the at least one hook, fixedly arranged at or near each end of a spar for coupling the corresponding end of the spar to a ladder rung, is an anti-lift hook having a hook portion with anti-lift function suitable in scaffold use configuration, s extend below the underside of the ladder bar with which the hook is intended to engage.

The absence of any moving part able to pass from a locked position to an unlocked position on the hook eliminates any risk of inadvertent separation of the spar of the base body, the rest of the frame.

Preferably, the base body further comprises at least two cross members which, when assembled to the side members, form a frame, the retaining stop and the anti-lift function hook portion of each anti-lift hook being offset at least axially in a direction orthogonal to the plane of the frame.

More preferably, the or each hook, fixedly formed at or near each end of a spar for coupling the corresponding end of the spar to a ladder bar, is in the form of a C or an inverted C. Preferably, again, each spar comprises at least one C-hook at one end and an inverted C-hook at the other end, said C hooks facing each other by their opening or their back. In order to simplify the assembly, each spar has, at or near each of its ends, at least two parallel anti-lift retaining hooks, arranged on either side of the retaining stop.

This arrangement makes it possible to have rails that are free of laying direction, as is the case with longitudinal members provided with a single hook at each of their ends.

The subject of the invention is also a rolling scaffolding frame of the type comprising at least two ladders equipped with wheels and a base body comprising at least two longitudinal members positionable between said ladders for the connection of the ladders to one another, characterized in that the basic body is of the aforementioned type.

The subject of the invention is also a rolling scaffolding, of the type in which each retaining stop of a spar is formed of a plate disposed at one end of the spar and extending substantially perpendicular to the longitudinal axis of the spar, this plate, able to come into abutment against the so-called internal face of a ladder upright, being equipped with two wings forming with the flat a U between the branches of which is suitable for inserting said scale amount to be retained, the wings each having at their base an anti-lift hook, characterized in that the additional retaining member is formed by a movable member, such as a pin, which, in the active position, connects the branches of the U to close the insertion housing of the scale amount retained inside said housing.

The invention further relates to a method of mounting a scaffolding scaffolding 20 of the aforementioned type, characterized in that it comprises at least the steps of: - hooking of the two longitudinal members of the base body by one from their ends to the upright of a ladder inclined to the longitudinal members at an angle other than 90 °; 25 - relative angular displacement of the ladder and spars around the axis formed by the crooked ladder bar to a position substantially at right angles to the amounts of ladder and longitudinal members in which the retaining stops of the spars are supported against an amount of the ladder in an area of the upright extending above or below, preferably above, the bar engaged with said hook; repetition of the hooking and angular displacement steps with the other end of the longitudinal members. The invention will be better understood on reading the following description of exemplary embodiments, with reference to the accompanying drawings in which: FIG. 1 shows an overall perspective view of a scaffolding frame according to FIG. invention; Figure 2 shows a perspective view of a base body according to the invention; FIG. 3 represents a perspective view of another embodiment of a basic body according to the invention; Figures 4A, 4B show schematic views of the steps of mounting a frame; Figures 5A to 5C each show a detail view of the anti-lift hook during its positioning on a ladder bar.

As mentioned above, the basic body 6, object of the invention, comprises at least two longitudinal members 7 positionable between two scales 2 equipped with wheels 5. The longitudinal members of the base body 6 are couplable to said scales 2 for the realization a frame 1 of scaffolding rolling. Each spar 7 of the base body 6 is, for the maintenance of a ladder 2 in the erected state in a position, called scaffold utilization configuration, in which the spars 7 of the base body 6 ' extend substantially perpendicularly to the uprights 3 of the ladder connected to the base body, equipped at or near each of its ends with at least two retaining members 9, 10. These retaining members 9, 10 are formed, one shown in 9 in the figures, of at least one hook 9 adapted to engage a bar 4 of a ladder 2 for coupling the spar 7 to the 2 scale, the other, a stop 10, said retaining stop, adapted to bear against an amount 3 of the scale 2 in an area of the amount 3 extending above or below the bar 4 in engagement with said hook 9, preferably above said bar 4. These retaining members, said complementary action, are, in configuration of use of the scaffold, corresponding to the configuration in which the amounts of scale extend perpendicularly to the longitudinal members of the base body, s able to form one stop, during a displacement parallel to themselves of the ladders 2 in the direction of a spacing, the other, during a displacement parallel to themselves ladders 2 in the direction of a rapprochement of said scales. Retainer 10 and hook 9 thus cooperate with each other for the maintenance in the erected position of each scale. In a manner characteristic of the invention, the at least one hook 9, fixedly formed at or near each end of a spar 7 for coupling the corresponding end of the spar 7 to a bar 4 scale, is an anti-lifting hook 9 having a portion 9A hook anti-uplift function apt, in scaffold use configuration, to extend below the underside 4A of the ladder bar 4 with which the hook 9 is intended to engage.

Thus, in this configuration of use of the scaffolding, any traction exerted on the longitudinal members 7 in the direction of a displacement parallel to themselves of the longerons upwards, that is to say in the direction of lifting of said longitudinal members, is prevented because of the conformation of the hooks, a portion of which engages with the underside of the ladder bars, this bottom face being shown at 4A in the figures. Likewise, the positioning of the retaining stop and the anti-retracting hook prevents any angular displacement of the scale around the crooked bar in a direction corresponding to the approach of the amount of scale of the retaining stop but allows this displacement. angular in an opposite direction. Generally, the base body 6 further comprises at least two cross members 8 which, when assembled to the side members 7, form a frame. These cross members 8 may be fixed removably or not to said longitudinal members. The rails 7 extend parallel to each other and are interconnected by said sleepers which themselves extend orthogonally to said longitudinal members. The stopper 10 and the hook portion 9A with anti-lift function of each hook 9 anti-lift are shifted at least axially in a direction orthogonal to the plane of said frame. Thus, in the examples shown, the retaining stop 10 extends above the hook portion 9A with anti-lift function of said hook 9. This retaining stop 10 stops at the opening of the hook to allow the lateral introduction of a ladder bar inside said hook.

Since this limit stop 10 bears against an amount of the ladder only in an area extending either above or below the bar in engagement with said hook, the opening of the hook serving the introduction of the bar inside said hook is kept free and an angular displacement between ladder and longitudinal members to allow this introduction is possible. This is not the case in the state of the art where the equivalent of the restraining stop 10 extends on either side of the amount of the ladder.

The hooks 9 may have various orientations of their opening depending on the chosen embodiment. However, preferably, the or each hook 9 of a spar 7, provided at or near one end of the spar 7, forms an open hook towards the other end of the spar, as shown in FIG. 2.

Generally, the hooks 9, fixedly arranged at or near each end of a spar 7 for the coupling of the corresponding end of the spar 7 to a ladder bar 4, affect one the shape of the spar. a C, the other of an inverted C, said C being preferably face by their opening or by their back.

In Figure 2, the C hooks are facing their opening while in Figure 3, the C hooks are facing their back.

Each abutment 10 for retaining a spar 7 is formed of a flat, disposed at or near one end of the spar 7, and extending substantially perpendicularly to the longitudinal axis of the spar 7, this flat being, in configuration of use of the scaffolding, able to bear against the so-called internal face 3A of the amount of scale, namely the face of the ladder upright facing the other ladder or the so-called external opposite face 3B of said upright .

In the example shown in FIG. 2, the retaining stop 10 is intended to bear against the internal face 3A of the scale upright while in FIG. 3 the retaining stop 10 is intended to bear against the outer face of the ladder upright.

The back of the hook C forming the bottom portion of the hook and the retaining stop 10 are arranged on either side of a plane orthogonal to the spar, this plane corresponding to the receiving plane of the scale 2, the opening of the hook being disposed on the same side of the plane that the retaining stopper at a level is greater than or less than said stop in the horizontal position of the spar. In horizontal position of the spar, each retaining stop therefore extends on the opening side of the hook above or below said opening and is offset relative thereto in a direction transverse to the longitudinal axis of the spar. In the hooked state of the spar at the scale step, the stop extends substantially in a vertical plane perpendicular to the spar, tangent said step, this plane being away from the bottom of the hook formed by the back of the C of a distance at least equal to the sum of the spokes of the bar and the amount.

In the embodiment of FIG. 2, in which the hooks face each other by their opening and the retaining stop is positioned above the ladder hook, an angular displacement of the ladder amounts in the hooked state at the base body about an axis passing through the crooked bar is possible in a single direction, from the erected position of said scales, so that the scales form a V between them. Conversely, with a base body conforming to that shown in Figure 3 in which the hooks face each other by their backs and the retaining stops are formed above said hooks, an angular displacement of said scales around a axis passing through the axis of the crooked bar is possible from the erected position of said scales to a position in which said scales form an inverted V between them. This possibility of angular displacement left by said retaining stop is necessary to allow disengagement of the bar of the hook. Note that in all these embodiments, each hook 9 is adjacent to a stop 10 and retained offset transversely relative to said stop with reference to the longitudinal axis of the spar. In the embodiments of FIGS. 2 and 3, each spar 7 comprises at or near each of its ends at least two parallel anti-lifting upright hooks 9 arranged on either side of the abutment. 10 restraint. In this embodiment, the constituent plate of the retaining stop 10 is equipped with two wings forming with the plate a U between the branches of which is suitable for inserting said scale upright 3 to be retained, an anti-seizing hook 9 being arranged at the base of each wing. Through-holes are also provided at or near the apex of each wing for receiving an additional retaining member 11 whose role will be described hereinafter.

The rolling scaffolding frame obtained thus comprises at least two ladders 2 equipped with wheels 5 and a base body 6 comprising at least two longitudinal members 7 positionable between said ladders 2 for connecting the ladders 2 to each other, this body 6 of base being preferably in accordance with what is described above. In the example shown, the scaffolding frame 1 comprises, for each ladder 2, at least one additional retaining member 11 in the upright position of said ladder 2, said member being an anti-rotation member 2946374 io arranged for, in use configuration of the scaffolding, forming a stop, limiting or preventing the angular displacement of the scale 2 about the axis formed by the bar 4 in hooked engagement with the longitudinal members 7 of the base body, in the sense of a spacing of the amounts 3 of scale of their abutment 5 10 retaining, this additional retaining member 11 or the abutment 10 retaining being formed as a movable member adapted to move from an active position retainer at an inactive position in which the ladder bar 4 can be disengaged from the anti-lift hook 9, after rotation of the ladder 2 along the axis of the bar 4. In FIG. 11 additional restraining organ that e st able to move from an active hold position to an inactive position. Indeed, in this embodiment, each abutment 10 for retaining a spar 7 is formed of a plate disposed at one end of the spar and extending substantially perpendicular to the longitudinal axis of the spar 7. This plate, adapted to come into abutment against the so-called internal face 3A of a ladder upright, is equipped with two wings forming with the flat a U between the branches of which is able to insert said amount 3 scale to remember. The wings each comprise at their base an anti-lifting hook 9. The additional retaining member 20 is formed by a movable member, such as a pin, which, in the active position, interconnects the branches of the U to close the insertion housing of the amount of ladder retained inside. said dwelling. The retaining stop 10 is in turn fixedly formed on the spar 7. In this same FIG. 1, the frame comprises at least one additional retaining member 12 of said ladder in an erected position, this retaining member being formed by a squareness diagonally releasably positionable between the ladders of the scaffolding, this diagonal being, in configuration of use of the scaffolding, fixed by one of its ends to one of the ladders and by its other end to the other scale. The additional pin-type retaining member 11 and the diagonal-like retaining member 12 may be used cumulatively or alternatively.

The method of mounting such a scaffolding frame 1 is as follows. In a first step and as illustrated in FIG. 4A, the operator hooks the two longitudinal members 7 of the base body 6 by one of their ends to the upright 3 of a ladder 2 inclined with respect to the longitudinal members 7 forming a angle different from 90 °. This inclination is necessary because of the presence of the retainers 10 to allow lateral engagement of the ladder bar within said hooks. Once the hooks of the longitudinal members are brought into engagement with the bar of the ladder, the operator angularly moves the ladder 2 and the longitudinal members 7 around the axis formed by the crooked ladder bar 4 to a position substantially at right angles to the uprights 3 of ladder and longitudinal members 7 in which the stops 10 for retaining the beams 7 bear against an amount 3 of the ladder in an area 15 of the upright extending above or below , preferably above, the bar 4 in engagement with said hook 9, as shown in Figure 4B. At this stage, the operator can introduce the additional retaining members 11 into the holes formed in the wings which form with the abutment 10 retaining a U. This positioning is however not mandatory, stability in erect position ladders already being observed in the absence of said retaining members 11. The operator repeats picking operations and angular displacement with the other end of the beams 7, in cooperation with the other scale of said frame, as shown in Figure 4B. Once again, once the hooking and angular displacement operations have been effected to bring the ladder uprights into a position in which they extend substantially at right angles to the longitudinal members 7 of the basic body, it may be proceeded to in place additional retaining members 11 formed by said pins. The operator can also be satisfied with positioning the squaring diagonals 12 as shown in FIG. 1, these diagonals forming an X between said scales. The positioning of both the squaring diagonals and pin-type retaining members 11 ensures double locking of the ladders in an upright position. As illustrated by the sequence of operations described above, the mounting process is extremely simple and can be done in a short time.

Claims (12)

REVENDICATIONS1. Base body (6) of the type comprising at least two longitudinal members (7) positionable between two ladders (2) equipped with wheels (5), and couplable to said ladders (2) for producing a scaffolding frame (1) rolling, each spar (7) of the base body (6) being, for the maintenance of a ladder (2) in the erected state in a position called use configuration of the scaffold in which the amounts (3) of the ladder (2) connected to the body (6) base extend substantially perpendicular to the longitudinal members (7) of the body (6) base, equipped at or near each of its ends of at least two retainers (9, 10) formed of at least one hook (9) adapted to engage a bar (4) of a ladder (2) for coupling the spar (7) to the scale (2), the other, a stop (10) said retaining stop adapted to abut against a post (3) of the scale (2) in a zone of the upright (3) extending above or below use of the bar (4) in engagement with said hook (9), said retaining members, said complementary action being, in configuration of use of the scaffold, able to form one stop during a displacement parallel to themselves ladders (2) in the direction of a spacing, the other, when moving parallel to themselves ladders (2) in the direction of a rapprochement of said scales, characterized in that the at least one hook (9), arranged in a fixed manner at or near each end of a spar (7) for coupling the corresponding end of the spar (7) to a ladder bar (4) , is a hook (9) anti-lifting having a portion (9A) of hook anti-lift function apt, in configuration of use of the scaffold, to extend below the face (4A) from below the ladder bar (4) with which the hook (9) is intended to engage. 2. Body (6) base according to claim 1, characterized in that the body (6) base further comprises at least two cross members (8) which, in the assembled state to the longitudinal members (7), form a frame , the stop (10) retaining and the portion (9A) of the hook with anti-lift function of each hook (9) anti-lifting being shifted at least 13axially in a direction orthogonal to the plane of the frame. 3. Body (6) base according to one of claims 1 and 2, characterized in that the or each hook (9) formed in a fixed manner at or near each end of a spar (7) for the coupling the corresponding end of the spar (7) to a ladder bar (4), has the shape of an inverted C or C. 4. Body (6) base according to one of claims 1 to 3, characterized in that the or each hook (9) of a spar (7) formed at or near one end of the spar (7). ), forms an open hook towards the other end of the spar. 5. Body (6) base according to one of claims 1 to 4, characterized in that each spar (7) comprises at or near each of its ends, at least two hooks (9) retaining anti-lift parallel, arranged on either side of the abutment (10) retaining. 6. Body (6) base according to one of claims 1 to 5, characterized in that each abutment (10) for retaining a spar (7) is formed of a flat disposed at or near a end of the spar (7) and extending substantially perpendicularly to the longitudinal axis of the spar (7), this plate being, in configuration of use of the scaffolding, able to bear against the so-called internal face (3A) the amount of scale namely the face of the ladder amount facing the other ladder or the opposite face (3B) said external said amount. 7. Body (6) base according to claim 6, of the type in which each spar (7) comprises at or near each of its ends, at least two parallel anti-lifting hooks (9) arranged on both sides of the stop (10) retaining, characterized in that said plate constituting the abutment (10) retaining is equipped with two wings forming with the plate a U between the branches which is able to fit said amount (3) scale to remember, a hook (9) anti-rising being provided at the base of each wing. 8. Frame (1) of rolling scaffolding of the type comprising at least two ladders (2) equipped with wheels (5) and a base body (6) comprising at least two longitudinal members (7) positionable between said ladders (2) for the connection of the ladders (2) to one another, characterized in that the base body (6) is in accordance with one of the claims 1 to 7. io 9. frame (1) of scaffolding according to claim 8, characterized in that it comprises, for each scale (2), at least one additional member (11) for holding in the erected position of said ladder (2), said member being a so-called anti-rotation member arranged for, in configuration of use of the scaffolding, forming a stop, limiting or preventing the angular displacement of the scale (2) around the axis formed by the bar ( 4) engaged by hooking with the longitudinal members (7) of the base body, in the direction of a spacing of the amounts (3) of scale of their abutment (10) retaining, this member (11) additional retaining or the retaining stop (10) being in the form of a movable member adapted to move from an active holding position to an inactive position in which the ladder bar (4) can be disengaged from the hook (9) against -soulèvement, after rotation of the scale (2) along the axis of the bar (4). 25 10. Frame (1) scaffolding according to claim 8, characterized in that it comprises at least one additional member (12) for retaining said ladder upright, this retaining member being formed by a squaring diagonal detachably positionable between the ladders of the scaffold, this diagonal being, in configuration of use of the scaffolding, fixed by one of its ends to one of the ladders and by its other end to the other ladder. 11. Scaffolding according to one of claims 8 and 9, the type in which each stop (10) for retaining a spar (7) is formed of a flat disposed at one end of the spar and extending substantially perpendicular to the longitudinal axis of the spar (7), this plate, adapted to bear against the so-called internal face (3A) of a scale upright, being equipped with two wings forming with the plate a U between the branches of which is adapted to insert said amount (3) scale to remember, the wings each having at their base a hook (9) anti-lifting, characterized in that the additional retaining member is formed by a movable member, such a pin, which, in the active position, interconnects the branches of the U to close the insertion housing of the amount of ladder retained within said housing. 12. A method of mounting a frame (1) scaffolding of a rolling scaffold according to one of claims 8 to 11, characterized in that it comprises at least the steps of: - hooking of the two longitudinal members (7) of the body (6) base at one of their ends to the amount (3) of a ladder (2) inclined relative to the longitudinal members (7) at an angle other than 90 °; relative angular displacement of the ladder (2) and longitudinal members (7) around the axis formed by the crooked ladder bar (4) to a position substantially at right angles to the uprights (3) of ladder and longitudinal members (7) in which the stops (10) for retaining the longitudinal members (7) bear against a post (3) of the ladder in a zone of the post extending above or below, preferably above, the bar (4) engaged with said hook (9); - Repetition of the steps of hooking and angular displacement with the other end of the longitudinal members (7).