FI59150B - MED HJUL FOERSEDD STEGE SOM KAN OMVANDLAS TILL EN SKOTTKAERRA - Google Patents

Description

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Belgium-Belgien (BE) 0 / l66l78 Proven-Styrkt (71) (72) Gilbert Loix, Chaussee Brunehault 22, B-hk62 Wihogae,

Be 1 gi a-B e 1 gi en (BE) (7M Berggren Oy Ab (5 * 0 Wheeled dowels that can be converted into trolleys - Med hjul försedd Stege som kan omvandlas account en Skott-kärra

The invention relates to wheeled ladders which can be converted into push carts and which consist of a pair of parallel bars on each side, between which pairs of steps are arranged so as to be rotatable so that they always remain parallel to the platform, whatever the inclination of the handles in a vertical position, the rods and support arms being pivotally attached to two horizontal parallel arms arranged at the top of the ladder, and which ladder, in its assembled position, forms a continuous plane consisting of the sum of the widths of the steps and almost the length of the rods.

There are already ladders with the steps remaining horizontal regardless of the angle of inclination of the ladder, and especially for access bridges connecting port piers to floating piers or vessels located below and able to move vertically relative to the piers depending on the tides, but in this case 59150 is not provides a continuous plane designed to support a large load, which requires that the load be distributed over almost the entire length of both arms.

In addition, actual ladders with handles and support arms and pivoting steps are already known, so that they always remain parallel to the ground, regardless of the inclination of the handles with respect to the ground. In such ladders, the handles and support arms or members are articulated to the horizontal arms at the upper end of the ladder, and the handles and arms and steps are pivotable. Examples of patents in which ladders of this type are disclosed are English Patents 577,185 and 974,654, U.S. Patents 3,446,311 and 3,731,761, and French Patents 1,060,402.

However, none of these known ladders exhibits horizontal arms according to the invention, consisting of hollow shaped bodies in which the pivot axes of the rods and support arms are arranged, and the upper ends of the rods and support arms rest on the upper wall of the hollow horizontal arm . None of these known ladders also show ladders that can be converted into push carts.

The features of the invention appear from the following claims. The primary advantage of the invention is that the ladder can be well secured with its structure according to the invention in both its step and push cart positions.

In order to illustrate the structure of the ladder according to the invention and the advantages of the invention, some embodiments of the invention are described below:

Fig. 1 is a side view of a ladder according to the invention, Fig. 2 is an enlarged side view of the same ladder as in Fig. 1 but mounted in a cart position, Fig. 3 shows a partial profile sectional view of one step of the ladder to illustrate the attachment of steps to the handlebars, 59149

Fig. 10 shows a sectional view similar to Figs. 2, 3, but on a slightly larger scale and with a different extension part.

Figure 11 shows this extension part in a perspective view.

Figure 1 illustrates the wall of the container with the number 1 «and the number 2 a number of plates, preferably aluminum plates 3, 4, which form a protective layer of the insulating layer 5, which insulating layer is, for example, mineral wool. The plates 3, 4 are fastened, for example, with pop rivets to annular rails 6 of substantially cross-section extending annularly around the tank wall 1, which are supported by ends of supports 7 arranged in horizontal rows and projecting perpendicularly from the wall 1. The supports are supported at their inner end by a strip 8 tightened around the tank wall 1, which presses against the tank wall 1 against the unfolded flange 9 of the inner end of the supports.

Each support consists of a main part 10 and an extension part 11. The main part 10 is U-shaped in cross-section and has two parallel, downwardly directed arms 12 and an outwardly directed flange 13 at its outer end.

The extension portions 11 are also U-shaped in cross-section and have two parallel, downwardly directed branches 14. The outer end of the extension portion 11 has an upwardly bent flange 15 which engages a U-shaped rail 6 and has two opposing support heels 16 at its inner end. is arranged in the operating position to engage the branches 11 of the main part 10. The waist 17 connecting the two forks 14 in the extension part 11 is provided with a row of transverse slots 18, 19, 20 to which the main flange 13 is arranged to engage depending on the desired length 7, 22 or 22 and 3) required for insulating layer 5.

When a thin insulating layer 5 is required, only the main part 10 of the support is used, and the rail 6 is suspended on the bridge flange 13. If a thicker insulating layer is required, an extension part 11 is used, which is mounted on the main part 10, as shown in Fig. 5, i.e. below the lower edge of the forks 12, in addition to which it is checked that the flange 13 adheres to the gap 18 or 19, as the case may be. When the thickest layer 5 is required, work 4 59150

In addition, the washer 18 prevents the side walls 16 from rubbing against the handles 1, 2. These walls 16, as shown in Fig. 5, are of sufficient height to allow the axis of rotation of the rod 1, i.e. the rod 15, to be displaced relative to the axis of rotation of the second rod 2, the rod 15.

In order to be able to shape the ladder, they are provided with support arms consisting of two plate or form bars 19, 20 attached to a axis of rotation 21 between the horizontal arms 3. It should be noted that the axis of rotation 21 is not located on the center line of the arms 19, 20 , but eccentrically with respect to these arms. The support arms are provided with a vertical wing 22 (Figs. 7, 8, 9) in such a way that the support arms 19, 20 can move from a position below the horizontal arm 3 (Fig. 1) to a rest position above the horizontal arm 3 (Fig. 2).

Between the support arms 19, 20, which arms have to act as guide arms for the trolley, a stiffening grid 23 is placed and a transverse axis 24 perpendicular to the support arms 19, 20, which generally has a tube from which the trolley can be pushed or pulled.

In order to move the carts, they are provided with wheels: wheels 25 fixed at the front, fixed to the lower handles 1, and wheels 26 pivoting at the rear, fixed (not shown) under a fixed step 10 in a known manner.

Since the trolleys must be secured and in order to maintain a secured opening angle in the ladder, they are equipped with a locking system as shown in Figures 7, 8, 9. There are four locking points marked with circles 27, (Figure 7) and 2 £>, 29, 30 (Figure 9).

The horizontal arms 3 are hollow shaped bodies inside, inside which are placed the axes of rotation 4, 5 of the rods 1 and 2 and the axis of rotation 21 of the support arms 19 and 20. The horizontal parts of these shaped arms acting as horizontal arms 3 are cut so as to release the rods 1 and the arms 19 and 20. to move. Only the upper 5 59150 horizontal part 31 and the lower, smaller horizontal part 32 are left on the arms 3.

In the cart position (Fig. 7), the lower rod 1 is locked against the upper rod 2 by a latch 33, the notch 34 of which falls on the protruding stop 35 on the side of the rod 1. However, this locking at point 27, which is not absolutely necessary, is provided to prevent the possible end of the opposite end of the horizontal arms 3 from rising when one has to lean heavily on one end of said arms via support arms 19, 20, in case ladders are used as carts. are unloaded.

When the support arms 19, 20 is raised to the arrow 36 direction (Figure 7), they operate in the first trolley ohjausvarsina (not shown) and then (figure 8) when the latch 33 is released and the support arms 19, 20 pivoting motion is continued direction of arrow 37 in the direction of their ends which is preferably is provided with a roller 38, have to push the lower rod 1, trying to turn it vertically.

However, when the rod 1 is turned vertically, the Super rod 2 also turns vertically and at the same time, of course, the horizontal arms 3 rise. Support arms 19, 20 turning the continuation of the arrow 39, is achieved the position as shown in Figure 9, wherein the support arms, the ends of the horizontal arms 3 horizontal portion 31 against (circle 29) as well as alisten the beams 1, the ends 40 (circle 29) and ylisten shafts ends 41 (circle 30) .

Once this position is reached, the turn is locked and it is impossible to close the ladder to a smaller recline. In order to keep the ladder at this closing angle and to prevent the reclining angle from opening, a locking arm 42 is arranged, preferably on both sides, fixed to the side of the lower arms 1 and having a notch 43 in the locking arm 42 for interlocking with a projecting stop 44 on the inside so as to obtain a locking point (circle 28, Fig. 9).

59150

In order for the locks to take place automatically, for example, the end 45 of the freely pivotable latch 33 on the shaft 5 is cut obliquely. When the steps are changed to their trolley position, this head 45 has to slide from a certain position (Fig. 8) down to the stop 35 and then in its final position (Fig. 7), with the notch 34 at the stop 35, falling locked onto the stop, and unlocking automatically as before explained.

Likewise, the notch 43 automatically falls over the stop 44. To this end, the locking arm 42, pivoting freely on the pivot axis 6 of the lower link 1, extends past this axis all the way to the pivot axis 7 of the upper link 2 in such a way that its end 46 has to rest on this axis 7 (Figs. 7 and 8). Thus, the locking bar 42 cannot fall vertically, but instead remains almost horizontal, so that the diagonally cut end 47 of this arm, from a certain position of the angle of closure, from the position shown in Fig. 8, rests against the stop 44 and the notch 43 finally falls against the stop. 44 on. Unlocking from this lock is not automatic, but is achieved by lifting the locking arms 42.

As shown in Fig. 9, the ends 40 and 41 of the rods 1 and 2 are also cut obliquely and at a certain angle so that they can rest completely on the inner surface 31 of the horizontal arms 31. However, a second cut 48 must be made at the ends 41 of these rods. The same applies to the ends 49 of the support arms 19, 20, which must have a beveled cut 50 so that they do not lean against the Alis rods 1.

Preferably, and in order to be able to move the ladder easily, the lower ends of the upper handles 2 are provided with small rollers 51 (Figures 1 and 2) so that the ladder can be rolled by these rollers by slightly lifting them from the horizontal arms 3.

If the ladder is to be used permanently as a staircase, with the upper step 10 acting as a workbench, the stairs should preferably be provided with a lowerable footrest 52 on which the worker stands to stand, thus ensuring the weight of the steps.

7 59150 This platform 52 can be fastened, for example, articulated from its arm 53 to a crossbar 24.

In order to keep this pallet lowered, an additional crossbar 54 (Fig. 2) can be arranged between the support arms 19, 20, to which the fastening strip 55 placed at the end of the pallet 52 can engage. The crossbar 54 can also act as a response 44.

When the ladder is used as a staircase on a permanent basis, it can still be provided, as shown in Figure 1, with a box 56 in which "tools can be stored and attached to the pivot axes of the sub-arms 1 in such a way that, like steps 8, the box 56 remains horizontal .

Although the support arms 19, 20 or the lower arms 1 do not have to be locked, they are completely prevented from continuing to turn in the ladder position (see circle 29), the width of the horizontal part below the horizontal arms 3 may also be such that, as shown in Fig. 9, the support arms 19, 20 on the one hand and the lower arms 1 on the other hand also rest on one or the other edge of this horizontal part, respectively.

It is clear that the invention is not limited to the embodiments described above and shown in the drawing, but without departing from the scope of the following claims, changes can be made, in particular to the locking system, by incorporating auxiliaries other than rollers 51, footrest 52 and toolbox 56, or by means of notches , with screw threads, etc.) for one or more pallets or file benches.

Although the device according to the invention can be made of any known material, it is preferably made of aluminum shaped bars, from which an extremely light and completely aesthetic device can be obtained. In this sense, the fastening devices for the different fastening points, as shown in Fig. 2, are also pivot pins and shafts for rotation and rivets flattened with a punch. On the other hand, the various pivoting and articulated shafts which require the use of washers are covered either by the outer surface of the horizontal arms 3 or by the side walls 15.

Claims (3)

8 59150 A wheeled ladder which can be converted into trolleys, consisting of a pair of parallel bars (1, 2) on each side, between which pairs are arranged steps (8) pivotable relative to the handles so that they always remain parallel to the ground, whether the bars are inclined to the ground support arms (19, 20) for holding the ladder in an upright position, the handles (1, 2) and the support arms (19, 20) being pivotally attached to two horizontal parallel arms (3) arranged at the top of the ladder, and which in their assembled position form a continuous a plane consisting of the sum of the widths of the steps (8) and almost the length of the handles (1, 2), characterized in that the horizontal arms (3) consist of hollow shaped bodies inside which the handles (1, 2) and the support arms (19, 20) the pivot axes (4, 5, 21) are arranged so that the drawbars and the support arms are inclined at their upper ends so that they, the drawbars and the support arms, form are parallel to and rest on the horizontal inner surfaces of said moldings (3), and that the support arms (19, 20) are positioned on the pivot axis (21) between the horizontal arms (3) eccentrically with respect to the center line of the support arms so that the support arms are connected to the pivot axis (21) by vanes (22) perpendicular thereto to move the support arms from a support position below the horizontal arms (3) to a rest position above them. Ladder according to Claim 1, characterized in that a locking arm (42) is arranged between the lower bars (1, 2) and the support arms (19, 20), the pivot axis (6) of which simultaneously acts as the pivot axis of the lower bar (1). extended to extend past this shaft (6) to the pivot axis (7) of the upper rod (2) in such a way that the locking arm (42) rests on this shaft (7) remaining almost horizontal and that the other end of the locking arm is bevelled so as to rest on the support arm ( 19, 20) to a fixed stop (44) until its notch (43) interlocks with said stop. 9,59150 Ladder according to claim 2, characterized in that the freely pivotable latch (33) is arranged on at least one pivot axis (5) of the upper handles (2), said latch having a notch (34) and a bevelled end (45) 1, 2) from a certain position rests on a protruding stop (35) fixed to the lower handles (1) until its notch (34) interlocks with said stop.