Classifications

• • E—FIXED CONSTRUCTIONS
  • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
  • E06C—LADDERS
  • E06C7/00—Component parts, supporting parts, or accessories
  • E06C7/006—Devices for preventing access

Definitions

• the present invention belongs to the field of safety devices with regard to lower access to ladders or the like.
• the scales concerned are those which generally run along an infrastructure (wall, post, pylon, etc.).
• the present invention intends to propose a device for controlling and prohibiting access which is universal, and therefore applicable to all types of ladders, in particular those mentioned above.
• the subject of the invention is a device for controlled access to an upper zone, comprising: a ladder plane with a mean plane, extending between a lower zone free of access for a user and said upper zone; a means of prohibiting or preventing the use of at least one rung of this ladder, formed by a panel; and means for connecting the panel to the ladder which make it possible to place the panel in a first state, applied against a face of the ladder, and in a second state, remote from this face of the ladder.
• Said panel is shaped so as to have a common cross section of which at least a part is close to the mid-plane of the ladder and which includes a cutout for the passage of said bar when the panel is in its first state.
• this panel is to make unusable, in any case for a correct support, some of the rungs of the ladder so that, for the user, generally equipped with work shoes (and not climbing shoes), it is not possible to place one's foot on a rung (and even to grasp it correctly) when the panel is flat against one face of the ladder, whether it is the access face of the latter or the face opposite this access face
• the part which is close to the mid-plane of the ladder, the one which is cut out is a central part in the case of ladders with rungs housed between two side uprights.
• the running section of the panel has two cut-out parts on each side of a central rib covering this amount.
• this central upright is at the same time a guide rail for a safety harness, the panel is located on the face of the ladder opposite to its access face.
• This arrangement has the advantage of applying to all scales, even those close to a supporting infrastructure, because there is always a space sufficient between this infrastructure and the ladder (15 to 20 cm to allow proper unimpeded support of the foot on the rung) in which the panel can be moved away from the ladder.
• the invention is also advantageous in the case of ladders provided on their access face with passive safety means such as crinolines or rails or cables. Its cooperation with the other face is not hampered by these constructions reported on the ladder.
• the invention also finds an interesting application in inclined ladders.
• the panel implemented in the invention has several advantages. It is an extremely simple manufacturing panel that can be obtained from a flat sheet, by bending or bending and cutting or punching. It can thus form the basis of more sophisticated locking devices such as normally closed locking devices, whether or not they are crossed by authorized users, so that no passage is left free of access and provided with a locking mechanism. opening for the user to cross them in the opposite direction. In its simplest version, it can be installed either on one of the two sides of the ladder.
• FIG. 1 represents an embodiment of a panel implemented in the device of the invention
• Figure 2 is a view of a common cross section of the panel according to Figure 1;
• FIG. 3 illustrates an access device according to the invention in which the panel of the preceding figures is connected to the scale by hooks;
• FIG. 4a illustrates a first example of common section of a panel according to the invention
• FIG. 4b illustrates a second example of a common section of a panel according to the invention
• FIG. 4c illustrates a third example of common section of a panel according to the invention.
• FIG. 4d illustrates a fourth example of common section of a panel according to the invention.
• FIG. 4e illustrates a fifth example of common section of a panel according to the invention.
• FIG. 5 illustrates the first state of a panel according to a first embodiment of the device according to the invention
• FIG. 6 illustrates the first state of a panel according to the first embodiment of the device according to the invention
• Figure 7 is a panel according to a second embodiment of the invention.
• Figure 8 is a panel according to a third embodiment of the invention.
• Figure 9 is a panel according to a fourth embodiment of the invention.
• Figure 10 illustrates an embodiment of the invention with a central upright ladder.
• the regulated access device to a protected upper zone represented in FIGS. 1 to 3 comprises a ladder 1, here surmounted by a safety cage 2.
• the mean plane of the ladder is denoted P in FIGS. 2 and 3.
• This middle plane is that which passes approximately halfway through the rungs 3 of the ladder.
• It also includes a panel 4 whose length is sufficient to cover several rungs 3 of the ladder 1 and whose width is at least substantially that of the ladder taken between the uprights la and 1b.
• This panel is shaped so that its common cross section shown in Figure 2 has a central portion 4a which, in the case of these figures, crosses the average plane P of the ladder.
• the function of this configuration is to make the rungs 3 of the ladder 1 inaccessible by making it impossible to support the foot or hold the hand.
• the central part then occupies the space between the bars by preventing the foot or the hand of the user from penetrating this space to bear correctly on the lower bar or to grip the latter.
• the bars are then housed in cutouts 5 provided in this central part 4a, when the panel is in its first state, which allows the central part to partially occupy the interbar space.
• the central part 4a intended to extend between the uprights 1a, 1b when the panel 4 is in its first state, is here flat in shape and extends between two longitudinal edges 4b of the panel 4 which are themselves intended to extend opposite each of the uprights 1a, 1b.
• the longitudinal edges 4b are here parallel to the central part 4a and are connected to the latter by intermediate portions 4c inclined with respect to the central part 4a.
• Figures 4a to 4e illustrate different variants of current sections for panels 4 according to the invention.
• the conformation of the panel 4 can be obtained by bending, stamping bending (FIG. 4e). It will be noted that some foldings also have the secondary function of stiffening the panel 4.
• FIG. 4a represents an alternative embodiment of the panel of FIG. 2. In FIG. 4a, it can be seen that the intermediate portions are perpendicular to the central part.
• the panel has substantially the same shape as the panel of Figure 2 except that the central part is provided with a longitudinal rib of triangular shape extending along a median longitudinal plane of the central part.
• the rib and the intermediate portions project from the same main surface of the central part.
• FIG. 4c represents an alternative embodiment of the panel of FIG. 4b.
• the longitudinal rib comprises a flat bottom connected to the central part of the panel by inclined sides.
• the panel 4 comprises a central part having a dihedral shape connecting directly to the longitudinal edges.
• the panel 4 comprises a central part having a curved shape connecting directly to the longitudinal edges.
• Figures 5 and 6 illustrate the two states of a device according to the invention in which the means for connecting the panel 4 to scale 1 consist of rods 10a, 10b so that the panel can be brought closer ( Figure 5 ) or away ( Figure 6) from the ladder parallel to itself. These figures do not illustrate the means for immobilizing the panel in each of these two states, means which are within the reach of a person skilled in the art.
• Figures 7, 8 and 9 illustrate three variant embodiments of the invention particularly suited to inclined ladders.
• one of the edges longitudinal panel 4 is hinged to one of the uprights 1a, 1b of the ladder by means of hinges 11 and 12.
• the hinge axis XX is thus parallel to the uprights of the ladder. Its application to an inclined ladder has the advantage, the panel 4 being intended to cover the front face of the ladder, to benefit at least partially from gravity to return, after opening, against the ladder in its first state.
• the panel 4 is articulated to scale around an axis YY parallel to the bars, by its lower part and more precisely by means of arms 13 and 14 extending the panel 4 downwards at the bottom. -beyond its lower part so that, when it is in its second state, as shown, the lower part of the panel 4 is sufficiently spaced from the ladder for the user's foot to be able to take proper support on the first bar discovered.
• the panel 4 is articulated to scale also around a transverse axis YY by the two arms 15 and 16 which extend its upper part to, as before, allow correct support of the foot of the user on the last bar discovered by the panel in its second state.
• the panel is located at the rear of the ladder so that the effect of gravity tends to place the panel in its second state.
• the device represented schematically in FIG. 10 relates to a ladder 17 with rungs 18 extending on either side of a central upright 19.
• the panel 20, here represented in the second state of the device (panel remote from the scale), is then shaped to include a central rib 21 and two side parts with cutouts 22 to accommodate the bars 18 when the device is in its first state.
• the central rib 21 delimits a housing for receiving part of the central upright 19 when the panel 4 is in its first state.
• connection of the panel to the scale at the central upright 19 can be achieved by means of hooks or an articulation, high or low. .
• the invention is not limited to the exemplary embodiments described above but on the contrary covers any alternative embodiment in accordance with the scope defined by the claims.
• the invention also finds an application if ordinary bars are replaced by steps, that is to say wide bars.
• the sheet metal forming the panel is corrugated parallel to its length to “meander” over the entire surface of each step at the level of the cutout.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Ladders (AREA)

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• 2020
  • 2020-09-30 FR FR2010000A patent/FR3114604B1/fr active Active
• 2021
  • 2021-09-08 WO PCT/EP2021/074732 patent/WO2022069174A1/fr unknown
  • 2021-09-08 EP EP21777227.6A patent/EP4222336A1/de active Pending
  • 2021-09-08 WO PCT/EP2021/074730 patent/WO2022069173A1/fr unknown
  • 2021-09-08 EP EP21773764.2A patent/EP4222335B1/de active Active

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