light structure , assemblable and disassemblable made in aluminum or steel , with circular , square , rectangular or other section , which is made up of three or four elements depending on the height under the ceiling of the worksite . it is a structure bearing on four points : one on the floor , two against the wall and a fourth point vertically opposite the point on the floor against the ceiling , this last point not being essential . the first bearing point , on the floor , very pulled back in relation to the inner wall , leaves a usable work space for placement of carpentry , installation of a stepladder , scaffolding , . . . of the material necessary for the worksite . the two bearing points against the wall are positioned on either side of the bay at eye level , close to the ceiling . a vertical blocking system immobilizes the system . fig1 : complete perspective view of the device according to the invention . fig2 : side view of the lower portion of the device according to the invention . fig3 : side view of the upper portion of the device according to the invention . fig4 : side view of the raising part of the device according to the invention . fig5 : top view of the of the device according to the invention without the raising part . fig6 : complete side view of the device according to the invention . fig7 : side view of the extension of the device according to the invention . fig9 : perspective view of the device according to the invention provided with options . fig1 : side view of a variation of embodiment of an additional structure which the device may comprise . fig1 : perspective view of a console which the device may comprise . fig1 : variation of embodiment of a base which the device comprises . fig1 is a perspective view of the device according to the invention , from the inside of a building . fig2 is a side view of the lower portion of the device according to the invention . it is provided with a base ( 1 ) providing a support surface making it possible to distribute the load . placed on the floor this base allows stability of the device during its assembly . the underside of this base may be provided with a small foam mat with a small thickness ( 2 ) able to prevent damaging the floors . on this base is secured a plate ( 3 ) on which a device is maintained allowing blocking and slight vertical pressuring of any structure from the top and from the bottom once the set of assembly operations are done . this vertical blocking can be done using a system such as a gas cylinder or any other system , in this case in fig1 a mechanical system with reversed threadings of the turnbuckle type ( 4 ). a threaded rod ( 5 ), lower portion of the tightener is secured on the plate ( 3 ). a second threaded rod ( 6 ) making up the upper portion of the turnbuckle is secured at the end of a bar ( 7 ). in the upper portion of the bar ( 7 ), a hole ( 8 ) allows placement of a key ( 9 ). fig3 is a side view of the upper portion of the device according to the invention . it fits into the lower portion by sliding of the bar ( 10 ) inside the bar ( 7 ). at the top of the bar ( 10 ), a hollow part ( 11 ) is secured inside which the bar ( 12 ) fig4 of the raising part can move vertically , the latter part being immobilized using the blocking key ( 13 ) housed in the hole ( 14 ) located on top of the part ( 11 ). on this hollow part ( 11 ) between the two arms ( 15 ) is the anchoring ring ( 16 ) fig1 , 3 and 6 allowing hooking of the operator &# 39 ; s ppe . the two arms ( 15 ) are articulated at one of their ends in ( 17 ) on the part ( 11 ) and several tens of centimeters from this articulation in ( 18 ), a bar forming a spacer ( 19 ) is articulated in ( 18 ) on the arm ( 15 ) and in ( 20 ) on the sliding hollow part ( 21 ). the hollow part ( 21 ) allows , by its upward vertical movement along the bar ( 10 ) thereby abutting against the hollow part ( 11 ), the deployment of the two arms ( 15 ). these two arms ( 15 ) sufficiently spaced apart from each other , in this case perpendicular to each other , are provided , at their other end , with articulations ( 22 ). these articulations receive “ load distributing ” pads ( 23 ) equipped with protective foam ( 24 ) bearing on either side of the opening on the inner wall of the worksite . the articulations ( 22 ) allow contact against a wall , regardless of its state and the folding of the structure . these two arms ( 15 ) are connected to each other by a cable ( 25 ) fig5 by two rings ( 26 ). an elastic tightener ( 27 ) fig5 connects the middle of the cable ( 25 ) at the top of the part ( 11 ) fig3 and 5 to a ring ( 29 ) facilitating bending of the cable during closing of the structure . the arms ( 19 ) fig3 articulated in two points ( 18 ) and ( 20 ) help opening and closing , by means of the handle ( 28 ) secured on the hollow part ( 21 ). the blocking key ( 30 ) housed in the hole ( 31 ) locks the element ( 21 ) in the high position , thereby keeping both arms ( 15 ) supported by the arms ( 19 ) in the open position . fig4 is the side view of the element making it possible to raise the device according to the invention . adjustment of its height is done by sliding its lower bar ( 12 ) inside the bar ( 10 ) and immobilizing it using one of the bores ( 32 ), located on the bar ( 12 ). this raising part is blocked by using the key ( 13 ) housed in the hole ( 14 ). this raising part is provided on top of a plate ( 33 ) able to be articulated , on which is secured a load distributing pad ( 34 ) equipped with foam ( 35 ), in order to avoid destroying the ceiling . this upper element fig3 slides vertically via the bar ( 10 ) in the bar ( 7 ) until the foam ( 35 ) comes into contact with the ceiling . it is immobilized as close as possible thereto via a second blocking key ( 9 ) which is housed in the hole ( 8 ) on this bar ( 7 ) and in the closest hole available on the bar ( 10 ). the vertical blocking immobilizing the structure is done via the turnbuckle ( 4 ). the anchoring ring ( 16 ) located on top fig1 , 3 , 5 , 6 : prevents the rope from dragging on the ground , decreasing the risk of damage thereof decreases , due to its position , the shock force absorbed by the anchoring and the fall factor , which thus cannot be greater than 1 . one recalls that the shock force is much greater than the body weight . it can cause the breakage of the rope , cable or mooring or hurt the individual . there is a shock when the rope blocks the operator . its value depends on the height of the fall . the fall factor is equal to the height of the fall divided by the length of rope used . this must be as low as possible . this anchoring point allows the operator to be connected to the structure via his ppe before mounting the stepladder and to obtain support on the edge of the window or another high up opening . for sites equipped with suspended ceilings , the raising part integrated into the upper element fig2 slides vertically until it reaches the existing ceiling . blocking by captive key ( 13 ) fig3 equips this raising part , which allows plenums of large heights . for sites with under - ceiling heights greater than three meters : an extender fig7 made up of two coupled arms ( 36 ) and ( 37 ) fitting into the arms ( 7 ) and ( 10 ), respectively , makes it possible to raise the entire structure . an additional blocking key ( 38 ) allows its immobilization . the structure fig3 , once folded fig8 , fits into an area corresponding to the lower and upper plates . it is stored in a bag provided with handles and / or straps allowing it to be transported as a backpack . it is easily transportable on the worksite thanks to its small weight . the dimensions can be modified ( decreased or increased ) to meet the needs of less common scenarios . the bulk of this structure can be reduced by half in terms of height once folded if it is made with arms ( 15 ) fig8 and arms ( 10 ) fig8 ( 7 ) fig2 ( 37 ) fig7 coupled to each other . this structure can be provided with additional support points on the floor to increase its stability during assembly and disassembly . a possible copy would consist of replacing the vertical blockage ( turnbuckle ), and the support point at the ceiling , by an additional set of legs and crosspieces limiting the interest of the system but nevertheless procuring the same advantages as the structure presented above . this structure would then be stable in itself , longer to implement , certainly more heavy and bulky but nevertheless can be higher performance because it does not require the presence of a support surface on top . another use of this device would consist , in other scenarios , of lifting loads from the street to the floor concerned by the work fig9 . by using a bar 39 connected from one side on top of the structure to the room ( 11 ) and at the other end with two arms ( 40 ) and ( 41 ) resting in two points on the edge of the window or the opening . these three arms are connected to each other by a connecting portion comprising , in its lower face , a lifting ring on which a return pulley could be installed . this pulley could be used as angle return . it could also be used to avoid friction of the wire used for insurance for an operator working down below the facade outside the building . all of this new structure fig9 together with a hoist could be used as means for lifting loads from the ground . fig1 shows that the bar 39 can be a telescopic structure in order to be adjustable in length , and that the additional lifting structure formed by the bars 39 to 41 can be completed by an additional upper bar 42 , connected to the part which makes it possible to assemble the bars 39 to 41 to each other and bearing on the edge of the wall of the building defining the bay in the upper portion . this bar 42 can have a telescopic structure in order to be adjustable in length and to be equipped with a tightener 43 . the part which makes it possible to assemble the bars 39 to 42 to each other can comprise a pulley on which the lifting cable passes . fig1 shows that the device can also comprise a console 45 including a floor and railing , designed to be placed on the outside of the bay , this console 45 being connected to the device by at least one cable 46 . a tool fall prevention net 47 can be stretched between the bay and the console 45 . fig1 shows a variation of embodiment of the lower base 1 . this base 1 comprises a vertical finger on which the telescopic element 7 is mounted with the possibility of vertical sliding in relation to this base . a spring 50 is engaged on the vertical finger while being inserted between the base 1 and the telescopic element 7 . a pedal 51 is mounted pivoting on the base 1 , and a rod 52 connects the pedal 51 and the telescopic element 7 . actuation on the pedal 51 makes it possible , via the rod 52 , to cause the telescopic element 7 to slide vertically against the elastic force of the spring 50 to make it possible to easily bring the telescopic element 7 into a determined sliding position in relation to the adjacent telescopic element 10 . this determined sliding position can in particular be that in which the holes comprised by one of the telescopic elements 7 come across from the holes comprised by the other telescopic element 10 , in order to make it possible to facilitate the insertion through these respective holes of an immobilization pin 9 of one telescopic element 7 in relation to the other .
this device makes it possible to ensure the security of workers of any trade who operate from the inside of a building , on a wall , through a bay in said wall , while in the vicinity of empty spaces and without damaging the inner or outer existing structures , characterized in that it comprises : according to the invention , the device comprises : a rigid structure to be placed opposite the bay ; two arms connected to the upper part of the structure , intended to bear on the wall , above the bay and on either side thereof , and an anchoring point integral with said structure , located at the upper portion thereof .