FR2597920A1 - Device enabling a ladder to be hung and displaced on a roof and ladder fitted with these elements - Google Patents

Abstract

The present invention relates to a device enabling a roof ladder to be hung from a ridge beam or from a chimney. The device according to the invention consists of main parts: two steel tubes 4, 7, sliding one into the other. A universal female tube 4, which can receive two interchangeable male tubes 7, 7' and which forms the clever part of the invention. The female tube is fitted at one of its ends with two hooks enabling it to be fastened to a ladder. The composition of this ladder is the following: a starting element, one or more intermediate elements, and a terminal element from which the female tube of the invention is hung. These intermediate elements are equipped with a tenon enabling them to be coupled, and with two arms fitted at their ends with a catch bolt closure device which holds them fastened one to another. A removable wheel 48 made from aluminium alloy, fitted at its periphery with five rubber rollers and held by a fork, is fastened to the end of the uprights of the terminal ladder. Its simple system makes it possible, by pushing the assembly, to climb the steps produced by the rows of tiles without difficulty.

Description

The present invention relates to a device for adding
expensive a roof ladder, a ridge or a chimney, and trav
go around them in any weather: -sun rain
snow or ice, as well as on very steep roofs, in all
safety, and without dangerous operation.

The mounting on steep or icy roofs is carried out
usually with the help of so-called "flat ladders".

The mooring of these being often difficult, even dangerous, because very often, it is already necessary to go up on the roof to remove tiles or other materials used for the cover so as to create steps, and to go to slip ropes in the attic to moor them around a joist or rafter.

This. work often requires the mobilization of several people.

Some of these moorings are done even by attaching these so-called ladders to the gutters, hence a possible uprooting of this. fixing means
The device according to the invention overcomes these dangerous drawbacks.

The device according to the invention consists of three main parts:
1) Two steel tubes sliding one inside the other. A universal female tube, which can receive two interchangeable male tubes and forming the clever part of the invention.

The female tube is provided at one end with two hooks allowing it to be fixed to a ladder.

 2) The making of the device according to the invention of the male tubes is different from each other.

One has one of these bent ends in the shape of a cane, allowing it to be hung on the back of a ridge, without resting directly on it.

The second of these male tubes, has at one of its ends a hollow square welded perpendicularly where inside slides another square of greater length, and acting as an arm.

It is this arm which allows it to be hung on the back of a chimney.

3) A ladder formed by removable elements S. of a length of two meters ten, made of aluminum alloy. These elements allow
extend this so-called ladder as needed.

The composition of this scale is as follows: A starting element,
one or more intermediate elements, and a terminal where comes
hook the female tube of the invention first.

These intermediate elements are provided with a tenon allowing them to be coupled, and with two arms provided at their ends with a bolt closure keeps them integral with one another.

Only the intermediate elements can receive another at their two ends. The starting and ending elements having at one of their extremities a rubber pad protecting them from shocks.

The intermediate elements are provided at one end of their uprights, a rectangular aluminum alloy rectangular form the stud, and their two arms mentioned (lines two and three).

 4) A removable aluminum alloy wheel fitted at its periphery with five rubberized castors, held by a fork, is attached to the uprights of the terminal ladder. Its simple system makes it possible, by pushing the assembly, to climb the steps occupied by the rows of tiles without difficulty.

The transport of this device and according to the invention is carried out by holding the element making up the edge-surf ladder. Said wheel is therefore arranged in the longitudinal direction relative to the rungs. This means that once the ladder is laid flat on the roof, this wheel is also flat and therefore does not interfere with the rest of the work.

 Its principle of use is easy to understand: When you push the whole device and according to the invention 1,2,3 or 1,3,4 The rollers act as a bearing, but as soon as one of them abuts a step caused by a row of tiles or other roofing material, this rotates the wheel which is positioned on another caster, and so on.

5) This assembly can be pushed from the edge of the roof or from an open sky when this assembly is carried out by the roof spaces
You can see the overview on Pu. 1/11 Fig.l.

 In (1) and according to the invention, the drawing represents the steel part provided with its arm intended to be moored at the rear of a chimney. This arm can be replaced by the (1 ') cane-shaped, and intended for mooring, behind the ridge.

 In (2) and according to the invention, the drawing represents the end part of the ladder element now at its upper edge, the device according to the invention (1), which is transported to it according to the device of the invention (3).

On PL.2 / 11 Fig.2 there is an overview of the present invention shown on PL.1 / 11 (1). The detail of these different parts is: (4) is the universal female tube intended to receive:
Either the male tube (7) or the (7 '), fitted with its two flat steel hooks (5 and 5a). These hooks maintain this tube (4) on the scale. They are welded to it: One at the end (4a) of the female tube (4). The opening of this hook is directed in the opposite direction to this end (aa). The hook (5a) is directed in the same direction as the (5), and is welded at a distance of 300 millimeters from axis to axis (25a). (This dimension corresponds to the interior side of the half-belt painter Fig. 3 (25B) .They are drilled in their axis with a hole (5B) Fig. 5 PL. 2/11 corresponding to the dimension included bottom of the half-belt hook (5), and the inner side of the key (17 ) thus allowing the passage of the rung (25). On the side of the holes drilled in these hooks (5 and Sa), a nut (lisa) is welded allowing the screwing of a key (18) with a diameter of 10 millimeters, Fig. 2,3,4,5 of the same plate.

On PL.4 / 1 Fig.7 representing a hook (5 or 5a) in front view shows in (10) a bending corresponding to the rounding of the female tube (4) thus ensuring better maintenance during welding.

The keys intended for screwing in these hooks are: The (17).

 PL.2 / 11 Fig. 2,3,5. Their clamping possibility is equal to the length between the washer (20) serving as a stop and the outer side of the nut (15a) Fig.5 plus the thickness of the flat bracket (6).

This removable bracket (6) is used in the maintenance of the assembly -ble according to the invention (1 and 2), as shown in Fig.l PL.l / 11.

It also ensures the position of the device (1) on the (2) either against the right upright or that of the left. See Pu.11 / 11 Fig. 31,32,33
The key (18) is used for the length adjustment of the male tubes (7) and Fig. 2A (7 '). We will take into account during the manufacture of this key (18): The diameter of the tube (4), the thickness of the flat bracket (6) and the welded nut (15).

In order to benefit from a meticulous length adjustment, the female tube (4) will be pierced with several holes (16) of 11 millimeters in diameter and an interval (INTl6Y of 150 mmben starting from (16C ') which is a 47 mm
The male tubes (7, 7r) Fig.2 PL.2 / 11 and Fig.2A PL.3 / 11 are of a smaller diameter than the inside of the female tube (4), of two ml- limestones allowing to slide freely inside it will be pierced at the same dimensions as the fla).

How is the male tube (7) made?
At one of its ends is welded perpendicularly ut. certified hollow (12) reinforced by two brackets (8). On one of the faces' 12aj,
A hole of 11 millimeters in diameter has been drilled so as to weld it
a nut (15a) threaded at the same pitch as the nuts (15). and intended for
receive a key (19) which will ensure by its blocking keeps it
of the sliding square (9) forming the arm. As shown in Fig. 1PL3 / 11,
PL.2 / 11 Fig.2 the sides of this hollow square (9) will be less than
sides of the hollow square (12> 1 millimeter, thus promoting its free movement. At each end of this arm (9l, a hole (21a) is
drilled and tapped so as to receive a threaded rod with a round head (21)
which will serve as a stop, and prevent it from coming out of its slide 12).

PL. 3/11. This plate represents the second male tube / which we
can interchange with (7), depending on whether you want to work in the middle
of the roof hung on the ridge or the chimney. The right part
going from the end (16CA ') in (B) will be the same as that of (7)
PL.4 / 11 Fig.6 we have the detail of the different component parts
the device according to the invention, which is shown in PL.1 Fig.l (1-J
It is therefore sufficient to give each their respective dimensions.

To know first of all that this device is entirely in "STEEL"
treated to 100 Kg of resistance per square millimeter.

PL. 4/11 Fig. 6. The female tube (4) has a length of 1000 mil
limestones, its outside diameter is 38 millimeters and interior of
32 millimeters. It therefore has a wall 3 millimeters thick, strong enough to support loads of 3 to 400 kg (useful loads in traction). This weight is never reached, because if there are heavy materials to approach the roof, it is the work of a crane.

The hooks (5 and 5a) will be made from flat steel of
6 millimeters thick and 30 millimeters wide. They will be rounded off as follows: 20 millimeters from one end com
will start the half-painter who will have an internal diameter of 30 milli
meters planned to receive rungs with an outside diameter of 28 millimeters, ie: 30 X 3.1416: 2 = 47 min. After this half-painter the
remaining length will be 45 millimeters. In PL. 4/11 Fig. 6
note that the hooks (5 and 5a) have rounded corners (Ag), dc
so as not to injure during transport or assembly of this device
The nuts (15a) will be welded on the outside to the half-painter and on
the hole provided for this purpose and drilled along an axis of 79 millimeters.

from the inside of the half-painter. the other nuts 1 ^,
will be welded to each hole, and on the same side as the hooks; 5
and 5a) so that the keys PL.2 / 11 Fig. 2,394.5 are turned
born on the side opposite the roof.

 PL.4 / 11 Fig.6 The male tube (7) will have a length of 1060 milli meters. This dimension takes account of the squaring reinforcements (8), which could cause the folding to a minimum inside the female tube (4). Its outside diameter will be 30 millimeters and inside diameter 24 millimeters, a wall thickness equal to that of the female tube (7).

At one of its ends, a hollow square (12) 70 millimeters long is welded. Its exterior sides will be 35 millimeters and interior 26 millimeters. This gives a wall thickness of 4.5 millimeters necessary for its mechanical strength to maintain the square (9).

 Pu.2 / 11 Fig.2 and PL.4 / 11 Fig 6 We see that this square (12) is reinforced by two brackets (8) representing a triangular piece of 50 millimeters side. These brackets reinforce both the hollow square (12) and the end of the male tube (7).

Inside this square (12) slides the hollow square (9) serving as an arm. Its length is 350 millimeters, its outer sides 25 millimeters and inner 17 millimeters, thus offering a wall thickness of 4 millimeters necessary for its mechanical strength.

PL.3 / 11 Fig.2A This plate represents the: male tube (7a). Making it is simple. It has the same diameter as the tube (7), its developed length is from (16CA ') to (B) 1060 mm from (B) to (B') llomm from (B ') to (L) 157mm and from (L ) to (1) 300 millimeters. In (B) its radius is 70 millimeters, the (A) 140 millimeters. These two quarter rounds will be made the opposite of each other and in the same alignment as the holes used for the length adjustment. Set back from (1), 50 millimeters, a hole 11 millimeters in diameter is drilled in the same alignment as the holes (16 '). On the inside of this hole a nut (15'a) is welded, thus allowing the screwing the key (18 '). A tube length (I) of 300 millimeters in length, 23 millimeters in outside diameter and 17 millimeters in inside diameter, will be used if an extension is required. It will be pierced with three holes of 11 millimeters in diameter. This device is represented
PL.1 / 11 Fig. 1 (1 ') showing the attachment to the ridge.

It is not impossible that other elements come to bear on the elements forming the scale. Take for example: Two devices, which according to the invention would be moored to two neighboring chimneys of only a few meters, and whether a ladder or a board is placed transversely, this could serve as a bridge!
In this case the devices (1 and 2) or (1 'and 2) could serve as
rack. We could work on the entire width of the
roof, "provided that these devices are strong enough
for this overload. "

PL. 5/11 Fig. 2 The keys (17,18,19), as well as that PL. 3/11 Fig. 2A
(18 ') will have a sufficient height shown in Fig. 5 PL.2 / 11 (H17)
to pass the hand. The length of the same keys will be (H17)
8- centimeters. The ring (20) will have an internal diameter of 10 milli
meters and exterior of 30 millimeters. It will serve as a stop when
tightening. It will be welded.

This device of the invention will be protected from corrosion by a
phosphate layer, one anti-rust layer and two layers of
lacquer of a showy color "ORANGE" which can perhaps avoid a false
- hangs maneuver.

PL.5 / 11 Fig.8,9,10, According to the invention represents the different
elements making up the scale. We note that these three elements are
of the same shape, but that their ends are different.

this is due to the fact that there is a terminal element Fig. 8, an interm
Fig. 9 and a starting Fig. 10.

Let's start with the element of Fig. 8 which is the terminal represented
ent PL.1 / l1 Fig.l (2) and showing according to the invention the principle of
fixing the hanging system to the chimney (1) supported by the (3) quf: aasunr the movement on the roof.

This element Fig.8 is composed of two uprightsA aluminum alloy
minium. (Light and rot-resistant resistant alloy). 2100 millimeters
long and of a hollow rectangular section having for external dimensions
rear: 65 X 30 millimeters and interiors of 54 X 24 millimeters don
nant a wall thickness (24A) of 3 millimeters. This thickness
is provided for mechanical resistance, which will be done flat and not
standing like an ordinary ladder.

The edges (26) of the uprights (24) will have according to the invention a
special profile shown PL.7 / 11 Fig. 16A in the shape of a "U". This profile
will be used to accommodate the rubber band (26a). The depth of this "U"
will be 5 millimeters now perfectly and laterally
rubber bands. In the axis of these edges (26) holes are
planned. they will be drilled every 130 millimeters starting from the prem
-ier, which is pierced to it at an axis (32B) distant from the end (32G) by 10 mm
they will be used to house the shoulder cone (32) shown in PL.7 / 11
Fig.16B and Fig.16A.

 PL. 5/11 Fig. 8. At the end of the uprights of the terminal element and only to these, on their internal face halfway between the end (28a) and the rung (25), that is to say: 136: 2 = 68 millimeters, a hole (27) is drilled there, it only crosses the first wall. It is provided for fixing the wheel presented PL.l / ll Fig.l (3) and which according to the invention serves as a bearing in transport on the roof.

In the same faces of the uprights, but this time in all of the uprights (24) elements for the passage of the rungs (25) passing right through the axis of the faces, holes are provided. There are 7 of them per upright, and are executed as follows: PL.5 / 11 Fig.9. The first is located at a distance from the end (28a) to the axis (25C) of 150 millimeters then in succession, going towards the axes (25B) every 300 millimeters.

 PL.5 / 11 Fig.8 and 10. These elements have rubber end caps at one of their ends (28). This is done to protect them from shocks, which they might receive, but also to avoid injury.

These tips have a special shape, shown. PL.7 / 11 Fig.16 (18) so as to dodge the shoulder cone (32) used to hold the rubber band (26a). This shape will be the same as that of the cut (B) Fig.17 (35) of the same board representing a truncated "A" this groove will be made from (28B) Fig. 16 to a depth I 2 centimeters in the direction of the end of the nozzle. The height will be the same as that of the cone (32). Their projecting end will be rounded and notched. It will overflow so as to form a shoulder abutting the end piece of the upright. The part located inside the upright will be glued using a vulcanizing glue making them integral with the uprights.

PL.7 / 11 Fig.16,17,18 We see the rubber band (26a). It will be in semi-hard rubber of light color, and in order to solidify it we will arm it with a canvas of synthetic fibers. It will be molded as follows: One side will have shoulder cones intended for its fixing, the side resting on the roof will be provided transversely with notches, as shown in Fig.16B (26D) PL.7 / 11 and which will have a depth of 2 millimeters, and will be of trapezoidal shape having like bases 5 X 3 millimeters. they will be spaced from each other by 3 millimeters and will be 416 per beard
Their ends (268) will be bevelled so as not to be damaged during transport or installation on the roof. profile will be the same as that shown PL.7 / 11 Fig.16A (26a)
From (26 ') to (26) 5 millimeters and from (26) inside 5 millimeters, i.e. a total thickness of 10 millimeters. The ridge thus made will have a depth of 3 millimeters.

The truncated cones (32) will have as base diameters (A) 14 and (B) 19 millimeters, (C) will be 15 millimeters thus offering a shoulder of 2 millimeters on the diameter, The height (B) (B ' ) 10 millimeters and will be arranged so as to enter the holes provided for this purpose in the edge of the uprights (26).

 PL. 5/11 Fig. 9 scale (25) and PL. 6/11 Fig. 15 '. The steps (25) will be cylindrical in shape having an overall length of 410 millimeters, an outer diameter of 28 millimeters and an inner diameter of 20 millimeters. As shown in Fig. 15 'PL.6 / 11, these steps will be reduced at their two ends so as to form at (25E) a shoulder intended to keep them locked. This shoulder will be 2 - millimeters which will bring these ends to a diameter of 24 millimeters, and will be riveted in the same way as shown in (25 ') thus ensuring their perfect maintenance. The dimension between (25E) is 340 millimeters.

 PL.6 / 11 Fig.15B shows the rung (33). This rung will serve as a spacer and a meeting point for the arms (29) .It is composed of two parts 1) the (33triera a smooth axis, 24 millimeters in outside diameter and 18 millimeters inside. It will have the same length as the others rungs, and will be riveted in the uprights in the same way.

2) Will be the rung (33 ') Fig.15B Its overall length will be 345 millimeters, its outside diameter of 36 millimeters and interior diameter of 30 millimeters. Its ends between (33'a) and (33'B) thus (33B) and (33a) will undergo a reduction reducing their outside diameter to 31 millimeters allowing them to penetrate inside the hole (29a) of the arm (29 ) Fig. 24 PL.9 / 11 but their internal diameter should not be reduced beyond 30 millimeters allowing this spacer to rotate freely around its axis (33). See Figure in detailed section PL.6 / 11 Fig. 15
PL.5 / 11 The intermediate elements Fig.9 will be made in the same way as the terminal element Fig.8, with the only difference that one of their ends will be fitted with a hanging system, which according to the invention, will allow the coupling of several elements.

This system is circled and marked (Det.II) is detailed Pu. 6/31 Fig. 13, 14,15, as regards how to fold or hang the arms (29) and PL. 7/12 Fig. 17 , 18 for the post (31).

The detail of the PL.9 / 11 arm closure system Fig. 23,24
Let's start with the post (31) PL.7 / 11 Fig. L7. These posts are made of solid aluminum alloy. At the start, they have the shape of a rectangular parallelepiped of 200 X 54 X 24 millimeters. These tenons (31) have one of their edges machined according to section B, in the form of a "A" truncated to allow the passage of the cone to shoulder (32). These tenons will be pressed into one of the ends of the uprights (24) at half their length, ie 100 millimeters, and will be held in position by 5 aluminum rivets of 6 millimeters in diameter, riveted at their ends on the uprights. (24) .In order to facilitate the fitting of these tenons (31) into another element, they will be chamfered (31 ') over a width of 3 millimeters and their thickness will be reduced by a few tenths by polishing.

The hooks PL.8 / 11 Fig. 19 and PL.6 / 11 Fig. 13 and 14 Will be conf
ected according to the details Fig. 23,24 PL.9 / 11. They will include a detailed closing and opening system PL.8 / 11 Fig.20,21,22, which according to the invention will make them - integral with each other.

The arms (29) will be the: part (29) shown PL.9 / 11 Fig.24 in aluminum alloy "TYPE C 7". Why C 7? Because it does not cause an electrical phenomenon on contact with steel.

The length of these arms will be 368 millimeters overall. At their widest end, a 31 millimeter diameter hole will be drilled through which the spacer (31 ') will pass Fig.15B PL.6 / 11. -. C.ez; e memq will be rounded off starting from the center (29a) it will have a radius of 30 millimeters. Starting from the point of the tangent with the diameter, its length (29a) and up to (29 ') will be 285 millimeters. As shown in Fig. 13 and 14 PL.6 / 11, this length is provided to pass behind the first rung of another element Fig. 13 or to be folded over the last rung advent of the same element Fig. 14 thus avoiding hanging or obstructing during transport or even injuring yourself.

Starting from the tangent points (29L) and (29L ') up to (291) the width will decrease regularly to reach in (291) 14 millimeters,
From point (291) the side (29 ') will be rounded to the same diameter as the holes (29a) and on 1/4 of the round, the remaining length will be 12 mm, which corresponds to the location of a rung . The side (29D) will simply have an angle cut according to the shape of a triangle having for sides 24 millimeters.

This half of the arm which begins in (A) and comes in (29 ') will be reinforced Far a sheet of stainless steel 2 millimeters thick
This reinforcement will be stamped, so as to form a fork which will maintain it from each side. In (29 '), the part (L41') will exceed 12 mil limeters, so as to form a cage whose internal dimensions will be 14 X 12 millimeters, and which will serve to house the mechanism
This reinforcement will be fixed using stainless steel rivets, and will be 9 in number distributed in the same way as shown in Fig. 23 PL.9 / 11
Note that they will all be at a distance parallel to the edges (41A) and (41B) of 6 millimeters except the (46d) which will be centered in the width (29D, 29d '). Starting from the end (41D) -, (46a and 46h) will be 7 7 millimeters, the (46b) 52, (46c) 110, (46j) 60, (46i) 125 milli meters, starting from the edge of the fold (47), (46e and 46f ) 19 mm.

According to this Fig. 23, the parts (43 and 43 ') will be folded at 900 with respect to (L41 and L41a), and (L41 and L41a) with 900 with respect to (L41') which will become the back of the compartment. See PL.8 / 11 Fig. 22.

 Pu.9 / 11 Fig. 23 The parts (43 and 43 ') will be started in (44 and 44') in the form of a 1/2 round 8'5 millimeter in diameter, which will allow the passage of the filtered rod (38 ) and will prevent the spring; from; exit (4S, 45 "3- = thickness of metal necessary for bending.

 PL.8 / 11 Fig.20 we have the principle of locking the arms (29) on the rung (25).

Fig. 22 of the same board shows us the cage (41) in which will be housed: The spring (40) inside which will pass the filtered rod (38) of the bolt (30). At the start the latch (30) is a rectangular parallelepiped of 57 X 14 X 12 millimeters. it is machined so as to leave a square forming the bolt (30 ') of 15 millimeters, a rod (38) of 8 millimeters in diameter and a thread (38') of 10 millimeters long with a pitch of 8/10. The end (39) is bevelled at 450 for easy attachment. At the rear of this cage, a flat steel iron (36) is provided serving both as a zipper puller (30) and as a spacer on the arms (29). Its length is 332 millimeters, its rectangular section is: 16 X 6 millimeters. At its ends a hole (42) is drilled in the axis and 7 millimeters from the edges. The assembly will be retained by a nut (37) which will screw up to the bottom of the thread.

 PL.8 / 11 Fig.21 section C shows the system with the bolt removed.

 The spring (40) will be formed by an enticorrosion treated steel wire of 1 millimeter in diameter, and will form a spiral of 8'5 millimeters of inner diameter, over a length of 40 millimeters. Its turns will be 10 in number so that once folded it does not exceed 11 millimeters, and does not interfere with the opening once compressed.

This arm system according to the invention will be mounted on the intermediate elements and the starting element. PL. 5/11 Figs. 9 and 10.

The starting element will have the same device as the intermediate element only at its opposite end to the hanging device, it will have rubber end caps, which will be manufactured and maintained in the same way as the terminal element Fig.8 . They will penetrate inside the uprights to a depth of 50 millimeters and exceed as much. Their overall length will be 100 millimeters.

the terminal element PL.5 / 11 Fig.8 will have at its end mooring side of the invention (1), and placed between the advent last echelon and the last, an aluminum foil (22) which will be folded in "U" shape see details Fig.11 and 12, which will serve as a squaring reinforcement for this element. The sides forming the "U" will have a height of 45 millimeters, and will be riveted on the inside of the uprights (24) using aluminum rivets (23) (pope type rivets). There will be 11, 6 at the top and 5 at the bottom Fig.ll distributed according to the division. This aluminum sheet could possibly be used to
removing tools PL.11 / 11 Fig.31.

oversight. <PL.6 / 1l Fig.15 section A. In (33A), the riveting will be done so as to act as a stop preventing the arms (29) from rubbing the rivets (34 and 34 ') and serving as attachment to the post ( 31), when opening or closing thisNix-ci. It will have a 5 millimeter overhang in (33) and from this riveting to the uprights a set of 2 millimeters on each side
The third element of the invention is the star-shaped "WHEEL" of its 5 casters, and presented Pu.1 / 11 Fig.1 (3) and facilitating the rolling of the present invention on the roof, climbing the steps caused by the rows tiles without difficulty.

 PL.10 / 11 Fig. 27 and in section D Fig. 27 detail of the wheel.

It is made of aluminum alloy type C7 (this alloy does not cause an electrical phenomenon on contact with steel). Its diameter is 100 millimeters, its thickness is 20 millimeters. It pivots with the help of a bearing (49) housed in its center. It is of the so-called roller type. Its outside diameter is 34 millimeters and its axis (50) of 10 millimeters, allowing the passage of a filtered rod in stainless steel of the same diameter.

At its periphery, and in the shape of a pentane, are arranged 5 casters, held by forks in stainless steel forming a "U", two millimeters thick, and 20 millimeters of IpLe.

They will be placed in a groove (52) of 20 X lm llimetrea
Who will keep them from turning. Keeping them in place will be ensured by a threaded stainless steel rod with a hexagonal head of 10 mu.

long, and 6 millimeters in diameter. During the screwing of these we will interpose between the head of the filtered rod and the fork, a serrated washer, which will avoid loosening, due to vibrations.

The length of these forks (52) will be: From (52) å (52 ') Fig. 27 36 mil limestones, and Fig. 26 (52) to (52a) 32 millimeters. There will be 5 per wheel. They will maintain at their end a caster which will have an outside diameter of 40 millimeters and which will be formed known as follows:
PL.10 / l1 Fig.27 by a ring (55) in hard rubber of light color, 10 millimeters thick and 24 millimeters wide. This ring will be vulcanized on a needle bearing (54) of 22 millimeters in diameter and 24 millimeters in width, with an inner diameter of 7 millimeters. The wheel and fork assembly will be joined by a stainless steel rod with an exagonal head, and threaded at the other end for only 5 millimeters, it will be held in place by a flat nut which
will abut at the bottom of the thread, thus avoiding putting a lock nut.

PL.10 / 11 Fig. 27 see section D. Once assembled, this wheel will have an overall outside diameter of 192 millimeters. It will be held in a fork PL.10 / 11 Fig.26 (59) having a suitable profile to also adapt to the uprights of the ladder, as shown in Fig.26 (58). The upper part will be profiled in the form of a hollow rectangular parallelepiped having internal dimensions: 100 X 71
X 31 millimeters so as to allow the uprights (24) to penetrate freely. In (58A), a stainless steel plate will form the bottom serving as a spacer. I1 must therefore be taken into account for the interior of the rectangle (58) 71 X 31. This plate will be installed after stamping the upper part (58 ') Fig. 26 and 27 and which will serve as the nut housing (60) Fig. 30, so as to be riveted Fig.29. This plate (59) will be electrically welded over its entire length, and on two sides, as shown in section D Fig.27 from (59) to (59a).

The length of this fork will start from: (59) at its estremite 65) of 126 millimeters. the ends (65) will be rounded along a radius from the axis (50) of 26 millimeters. Its edges (57) and "7 ') will descend from (59) and (59a) at an angle to the tangent with the (65), and will be reinforced by a rib in represe arrdie: -i" - "
E Fig. 28 10 millimeters wide and a 3-millimeter arrow around their entire edges.

This wheel will be assembled with the fAT pAT a threaded rod <tè-
Hexagonal stainless steel 10 millimeters in diameter and penetrates the axis of the bearing (50) as well as that of the forks. In order to be able to block this filtered rod, and to avoid crushing, spacers (62 and 62 ') Fig. 26 are provided. It will be held by two flat nuts, one tightening, the other acting as a lock nut.

PL.10 / ll Fig. 27, in (58 ') the profile given by stamping is made so as to accommodate the nut which will allow the screwing of the filtered rod (61') which will block its device on the uprights (24) of the scale. This device according to the invention is composed as follows:
PL.10 / 11 Det III Fig. 29 and 30. A nut and a threaded rod with stainless steel fins.

The nut (60) Fig, 30 seen in section will be of hexagonal shape with a diameter of 27 millimeters. Its thickness in (65 and 65 ') will be 13 millimeters
In (65) it will form a shoulder of 3 millimeters. The part (60 ') represents strips which will be riveted inside the profile (58' as shown in Fig. 29 and will thus prevent it from coming out of its support
They will have a thickness at the base (65) of 3 millimeters, and at (60 ') 1'5 millimeters. This nut will penetrate in (58 ') Fig. 26 and 27 into a hexagonal hole thus preventing it from turning during the screwing. Hole shown in dots Fig. 29 (64).

The stamping <58 ') will be circular in shape and will have a sufficient depth to accommodate the riveting, thus avoiding any rough edges detrimental to the passage of the upright (24). To secure this fork on the uprights, a threaded rod with fins Fig. 27 (61 ') which, by screwing, will penetrate into the hole (27) of the upright (24) will serve as a spindle. The fins of this filtered rod will have the shape of a rectangular parallelepiped of 60 X 19 X 6 millimeters.

 The devices according to the invention are clearly explained and understood on reading their detailed descriptions above, of a preferred embodiment. One can apply modifications of details to their constructions without departing from one's mind. It goes without saying that this description is not limiting and that the appended claims must be interpreted in their broadest sense.

Claims (7)

 1) Ladder device for mounting on roofs, cara  -ctérisé in that it comprises elements (2) equipped with pins (31) and  arms (29) provided with bolts (30) allowing them to abut, and provided with  devices (1 and 1 ') clinging to an object protruding from the roof  chimney or spanning the ridge and mooring by pressing on the slope  opposite supported by a star wheel of 5 castors which ensures the  transport.  2) Ladder element device according to claim 1  characterized in that it comprises pins (31) allowing them to be  mate, and arms (29) mynis of bolts (30) making them integral  one another.  3) device which according to claims 1 and 2 is characterized in  c that it has notched rubber bands (26a) providing it with  better adhesion to the roof, and which are retained on the uprights  (24) by shoulder cones (32).  ensures positioning either against the upright, left or right,  which makes it solid with this element as well as the square (6) in  (5) which fit onto the steps (25) as well as two keys (17)  (4) can receive one of the male tubes (7Ou7a) having two hooks  at its end and forming one of the devices (1 or the), a female tube  4) Device according to claim 1 characterized in that is fixed  5) device which according to claim 4 is characterized in  that the male tube (7) has at one end a perpendicular arm  (9) transversely sliding ensuring a width adjustment on the  mooring point, and that the tube (7a) has a rounded shape allowing it to span  the ridge to hang on by pressing on the opposite slope.  6) Device which according to claims 1,4 / 5 comprises a tube  female (4) and male tubes (7, 7a) characterized in that it comprises  holes ensuring their length adjustment according to the importance of  their mooring point and which are kept in position thanks to the  keys (17,18) as well as the bracket (6) which ensures its position  on the scale either on the right or left upright.  7) Device according to claim 1 allowing the transport of  all the devices on the roof characterized in that it  includes a wheel (48) spangled with 5 castors and fixing it on one of the  uprights allowing it to climb smoothly the steps involved  by the rows of tiles, as well as its free mobility on a roof  snowy.