FR2862678A1 - Foldable ladder for use with swiveling trap door, has three parts including posts and stairs and foldable on each other through articulation unit, where widths of stairs are equal to or greater than widths of posts - Google Patents

Abstract

The ladder has three parts (2-4) with longitudinal posts (6) and stairs, and foldable on each other via an articulation unit, where the widths of the stairs are equal to or greater than the widths of the posts. The stairs pass partly from same side (C1) of the posts in upper part end and pass partly from a side (C2) or side (C1) of the posts in a lower end part. The stairs are intercalated in a folded position. An independent claim is also included for an installation including foldable stairs.

Description

This arrangement of steps characterizes this staircase.

  The use of a steel frame with an angle of 30x30x3 contributes to the thinness of this staircase, it is a characteristic of this staircase.

  This staircase requires the addition of a second trapdoor which will be placed at the same level as the floor of the attic, this trapdoor can be constituted in two or three parts. In the drawing 7/10, it can be seen that the tube ( 17) prevents the hinge (11) of 80mm steel to open (we can put a hinge of 100mm), the staircase thanks to this tube remains rigid, it is another characteristic of this staircase The trapdoor does not play anymore the only role of closure and support and fulcrum as 40 on the other stairs of ancient technique.

  The tube (26) (see drawing 7/10) supporting the steps of width 80mm and numbered from MI to M11 is in aluminum alloy 6060AGS of section 25x25x3, however this tube can also be made of steel of section 25x25x2, in which case we will remove the inner sleeve tube (24) of 18x18x1.5 section steel while directly welding the tube (26) on the hinge.

  It is also possible to use aluminum hinges of 100 mm or more while keeping the reinforcement sleeve tube (24), the tube being shortened compared to the drawing, the aluminum then going beyond the level of the steel and hiding it will then be directly welded by the MIG process on the hinge.

  The axis of rotation (9) in the drawing 6/10 is that of the hardened steel threaded rod 50 diameter 14 (fine pitch) bearing the number (20) in the drawing 8/10 The iron (27) visible on drawing 8/10 will be a hardened steel square hardened by 20mm if the tube (26) is 25x25x2 section steel or so a 19mm hardened steel square if the tube ((26) is from the aluminum section 25x25x3.

  This iron will be tapped for the passage of the threaded rod (20) The two pins (22) prevent the staircase from moving laterally (see drawing 8/10.

  The anti-slip steps are 8/10 mm aluminum (1050A5 alloy) or even 6/10 thick.

  The gusset (25) sheet 3mm thick (see drawing 6/10) which has its identical 60 on the other side reinforces the area where the threaded rod (20) biases the frame.

  The gusset (28) reinforces the place where the weight of the staircase is exerted when it is folded (see drawing 6/10 and 2/10).

  The axis (30) of the drawing 6/10 is the axis of the steel frame and is located 345mm from the outer edge. this axis is of course coincident with the longitudinal axis of the aluminum staircase.

  Y dimension (see drawing 6/10) can be brought to 420mm by changing the dimensions of the mechanisms (15) and (16), see drawing 2/10.

  In (15), the round iron can be replaced by flat section 15x5 or 20x5 and can be shortened the length of the threaded rod.On can also shorten the threaded rod (l 6). This will have the effect of consolidating the staircase. The square iron can be machined to 19mm if the tube (26) 70 is aluminum.

  In point (39) see drawing 3/10, the sheet can be folded inwards and not as shown here to the outside.The word accéssoire more specifically designates the mechanisms (33) see drawing 1/10; (15) see drawing 2/10; (32); (14) see drawing 6/10.

  The word accessories also refers to the parts (16), (32), the pins' the springs (18), (21), 75 (and the pulling pin of length approximately 1000 mm and outer diameter 20 mm fixed at the points (12) and (23), the spring (18) is a torsion spring.

  The word accessories also designates, the sleeve (40), the threaded rod (20), the support (10), the tube (17), the male anti-slip plastic sleeve (3), the mechanism (14), one can also add two latches (not shown) so as not to allow accidental opening of the hatch, it can also add the hardware type compass, the two hinges of 70mm etc, all these accessories can be mounted by the user (sale in kit).

  At line 27, you have to read. replace this angle by aluminum plate section 20x6 (it will be referred to the steel frame). Here the hatch (1) plays the only role of closure.D in all cases we will keep the tubes steel sleeve that we can if it is possible to make hardened steel hardened, heat treated. The tube (17) can be replaced by a steel round iron with a diameter of 16mm and a length of 200mm passing through two 30mm long-sleeve tubes welded to a gusset, this gusset being welded to the 25x25x2 steel tube or the 25x25x3 aluminum tube. on both sides of the hinge to ensure the rigidity of the hinge by empechani the hinge (11) to open. . Line 5.2i1 must read: 18.5mm square instead of 19mm 90 For more rigidity and strength it is preferable even if the tube (26) is made of steel to leave the '1'ube sleeve (24) steel. See lines 65 and 66: of course in this case the length of the 14mm diameter rod (see drawing 7/10) will be lengthened by the necessary length.

  Line 69: Read machined at 18.5mm. The four hinges (11) two left and two straight will be wellmontafin that in no case the three tubular parts (each consisting of 95 two tubes on which the steps go to get attached) can not come out of their hinges.

  These tubular parts have an approximate length of 1000mm. The threaded rods are made of steel, the nylstop type steel nuts except when they are welded. A wooden pole that ends with a steel cap pulls part serves to maneuver the whole assembly. (21) is taken at points (8) and (19).

  The spring of length (not in working position) less than 1000mm and external diameter 20mm is taken at the points (12) and the point (23) on a not shown mechanism fixed on the wood of the frame supporting the hole made in the ceiling; frame attached to the joists.

  The point (12) consists of a partially threaded rod which passes through the tube and the sleeve and is fixed by two nuts, this rod is provided with a ring which allows the pole (provided with a steel tip pulls) stopper) to close the stairs if you are in the attic.

  The nut (34) attached to the aluminum sheet or on the wooden hatch peunet from the attic to close the hatch with the pole. The ring (33) closes the hatch being placed under the attic. An insulating rubber seal visible in the drawing 2/10, which rests on the aluminum angle (31), makes it possible to insulate the hatch which can be insulated (thin material). The steps are riveted on the tube (4 rivets diameter 4mm per step) The threaded sleeve (40) can be provided with two pins.The tube (17) is also pinned (this pin will be provided with a small chain) .the tube (17) will be joined to the staircase by a small chain). Mechanisms (16) and (32) are not shown in drawing 1/10 for clarity.

  Here (system not shown). The staircase (on which we will have fixed a steel rod serving as attachment point) may be equipped with a type of compass fitting to further improve safety during the descent maneuver from the stairs.

  Triangular gussets (41 plates at the four corners of the steel angle frame) characterize this staircase 120 The eight triangular gussets (42) made of 3mm thick steel sheet are welded to the frame (4) to give it a very good high rigidity.

  Threaded steel rods with a diameter of 14mm (see drawing 10/10) can be welded to the arc or soldered once the adjustment and assembly has been carried out. Of course this staircase is also in the area of folding stairs (and retractable). Line 44, read section steel 20x20x2mm.

  Line 52 of the description should read: or a square iron 18.5x18.5mm section hardened hardened steel.

  Line 69 of the description, ii. read: the square iron (43) (see drawing 8/10) can be machined at 18.5x18.5mm section. 130 In all cases (or there will be contact) knowing that the aluminum steel contact produces an electrolysis phenomenon, we will proceed to the heat treatment of the black steel, the steel will be galvanized hot and postlaqué.Les washers will be isolated ( an aluminum part and a plastic part). Galvanized steel welds will be treated against rust Bolts in some cases may follow the same treatment. Suitable rivets will be used. If steel sheet is used, it will be hot-dip galvanized and post-coated. 4 bis

  Description staircase ei aluminum (surte page 4) Anodized aluminum. painted steel if contact with aluminum.

  Line 112: read riveted on the tube (26). Line 86: read, in two round tubes sleeves. Line 44: read (24) steel section 20x20x2.Ligne 46: read the tube (24) farting rappcotici ... 1e140 aluminum tube (26) protruding being longer than the steel tube (24), the aluminum tube set ' then soldered directly to the aluminum hinge. The steel will be painted beforehand (sleeve tubes or other cases as soon as there is a possible contact between steel and aluminum, it may be hot-dip galvanized, or hot-dip galvanized and painted, or covered with a light layer of special plastic paint Steel can be protected (as it is done for the steel axes of the aluminum hinges 145 taking a golden color) Aluminum washers with one or two plasticized faces.

Claims (1)

  A retractable staircase characterized by the location of the steps (see drawing 1/10) relative to each other, the axis of the thirteen steps being all 70 degrees to the plane constituted by the closure hatch, they are all placed on the hatch which gives it a minimum thickness.   This staircase by its thickness removes the box in all cases, from then on A second hatch located in the attic becomes indispensable it will be located at the same level as the floor of the attic, it can be in one, two, or three pieces where it falls.   The 30x30x3 steel frame is made of four corner pieces, it can be screwed wooden boards horizontally or vertically to hide the cut-out of the ceiling or dress the hole left in the ceiling by the cut This frame (2) d overall footprint 1250x690 contributes by its small footprint to Give a low thickP11r to the set also characterizes this staircase.   The existence of the tube (17) allows the hinge (11) not to open and therefore gives the stair 15 the necessary rigidity, it characterizes this staircase; The threaded rod (20) which is cut in the middle at the point (36) of about 3mm is provided at this location with a sleeve (40) which allows the staircase to be dismountable (without damage to the mechanism) and to leave the entire opening for the passage of packages or bulky objects This hardened steel sleeve of outer diameter 25mnim and length 60mrn 20 characterizes this staircase.It allows indeed with other accessories that I will mention further to this staircase to be dismantled and therefore to be sold as a kit.   The 14mm diameter threaded rod is also made of toughened hardened steel.   The tubes used are, depending on the case, aluminum 25x25x3 section 6060AGS alloy or 25x25x2 section steel.   The sheet used to manufacture the steps may have 6 or 10 S / 10 thickness 1050 A5 alloy The hatch will be made of wood or plywood of 1mm thick or aluminum 2mm thick alloy 1050 A5. the hatch can be insulated. made hermetic with the cold Thanks to the current materials of small thickness, to go from 10mm to 2mm thickness makes it possible to reduce the thickness of the assembly of 8mm by allowing the axis of rotation (9) to decrease as much Staircase can also be used in aviation provided that magnesium or titanium metals are taken. This is a characteristic of this staircase.   The word accésoire cited above denotes the springs of traction and torsion, the clamps Servant closing the hatch (l) and mechanisms for fixing the three tubes de3O section 25x25x3 aluminum or 25x25x2 steel between them.   This staircase supports a load of 150kgs.   The four triangular steel gussets (41) are welded to the four corners of the steel frame, on this frame (see various drawings including drawing 6/10), these gussets are 3mm thick. they give the frame more rigidity. These gussets characterize this staircase. . The four triangular steel gussets (4l) are welded to the four corners of the steel frame, on this frame (see various drawings including drawing 6/10), these gussets are 3mm thick, 40 they give greater rigidity to the frame . These gussets characterize this staircase. . Line 12 of the claim, read: this frame (2), see drawingl / 10 or (4) see drawing 6/10.   The location of the steps relative to each other characterizes this staircase.   In the case where an aluminum trapdoor (1) of 2mm thickness is installed, the 15x15x1.5 aluminum corner is replaced by a 6060AGS aluminum alloy plate of rectangular section 20x6mm screwed on a frame. If desired, two other tubes (17) (not indispensable) can be placed on the other two joints between M4 and M5.   The two gussets (25) reinforcing the zone or axis (20) on the frame characterizes this staircase. Other triangular gussets (42) always of thickness 3mm (like the two gussets (25)), of the number of six will reinforce the frame (2) enacier 10.   Y dimension can be reduced to 420mm by shortening the size of the elements (15) and (16). The gusset (28) characterizes this staircase.   The steel or aluminum hinges normally used in locksmithing which can be 80mm or 100mm or 120mm characterize this staircase The threaded rod (20) not end hard hardened steel characterizes this staircase.   Steel tube sleeves of square section (24) reinforcing the joints especially in the case where the tubes (26) are made of aluminum characterize this staircase Square iron (43) hardened hard steel characterizes this staircase The fact that one can in any case remove the clutter caused by the box and Have the stairs under the floor of the attic (thus saving the living space.) This fact characterizes this staircase 25 All steel parts (in contact with aluminum) can also be prepainted (including welds) or hot dip galvanized steel, lacquer thereafter The square iron sleeve (43) can be made of aluminum, but it can also be pre-painted steel or galvanized steel. hot, subsequently lacquered (nostlaquered).   The same shape (the folded section) of the steps (at the same level where the riveting is done) and the shape of the folded section of the step having as axis the longitudinal axis coincidental of the staircase itself, these two different shapes characterize this staircase by allowing the three tubes of square section to be superimposed.   Aluminum steps staircase (continued)   I claim everything that is drawn, all that is drawn characterizes this staircase.All that has been said in the description the solutions brought to the problems of the contact of steel and aluminum 5 characterizes this staircase.However I repeat that, the aluminum will be anodized, this characterizes this staircase, the painted steel if contact with the aluminum (what characterizes this staircase). The steel will be galvanized with hot which characterizes this staircase. The steel can be hot dip galvanized and painted with a special paint, or hot-dip galvanized and lightly coated with plastic (all that has been said in this sentence characterizes this staircase). The steel can be protected as it is done for the steel axes of the aluminum hinges or the steel is in contact with the aluminum which characterizes and staircase. We can even design aluminum tubes (26) 4mm thick profile or even consolidate this profile by ribbing inside of course the shape and dimensions of the sleeve tubes will be modified accordingly, this characterizes this staircase. The aluminum washers will have their two plasticized faces which characterizes this staircase. Line 22 page 5, read: threaded rod (20). The steps can be hot-dip galvanized steel with 6 / 10mm thick non-slip ribs riveted to a steel tube (26) of the same shape and design as the aluminum ones.   The steel steps (with this section folded there characterizes this staircase). The systems (15), (32). (16) characterize this staircase. The threaded rod (20) characterizes this staircase. The gussets (42) and (41) ) characterize this staircase.The three different forms of aluminum steps characterize this staircase (same if they are made of steel) 25 Sleeve tubes (44) characterize this staircase. The hinges (11) of 80mm, 100mm.120mm steel or aluminum characterize this staircase. All that is reported as characterizing this staircase is claimed.