EP0182727A2 - Lifting device - Google Patents

Abstract

A lifting device comprising a welded chassis 1 on which is fixed in an articulated manner at its lower part a single vertical tubular post 3 along which moves a movable carriage 16 supporting an elevator drawn by a cable actuated by a manual or electric winch. The length of the post may be increased by inserting nestable elements into one another. The winch is fixed onto a winch support 12 which is connected to the chassis and which locks the post in a vertical position. For transporting and handling the device, the post folds in a horizontal position over the chassis and receives the winch support. For assembly, the winch support is unfolded into a vertical position and locked by means of the two struts 14, then the winch by pulling on the cable directs the post into a vertical position; it remains only to install the pins 6 and 9 for locking the post. The movable carriage may be equipped with a safety brake which locks the carriage and its assembly to the post in the event of the cable breaking. <IMAGE>

Description

The subject of the present invention is an adjustable platform which makes it possible to lower or mount shuttering elements for masonry slabs, or other construction materials, in particular materials.

Until then, in masonry, for the formwork of solid slabs or floors, we use the following different methods wood, bastaings, boards, plywood supported by props, these techniques lead to an excessive consumption of wood, and to a loss of labor time, they are now exceeded.

The other techniques, using prefabricated BA pre-slabs, are expensive and no longer adapt to new designs and architectures of the structures.

Currently, many companies are equipping themselves with rigid modular panels for wall formwork.

These modular panels are perfectly suited to the formwork of solid slabs, but they are rarely used; serious drawbacks appear at the time of formwork removal. Indeed, when the slab is poured, the formwork on the ceiling is necessarily manual in difficult conditions, with constant and progressive insecurity, depending on the height of the slab.

These modular panels are reliable, economical due to their reuse. They are quickly put in place and give very good technical results, but being on the ceiling aggravates the conditions of insecurity, due to their weight.

To overcome these drawbacks, we have imagined a platform that allows you to get the panel from the ceiling, support it during unlocking and lower it mechanically, with precision, flexibility, without effort and with great security.

It is known from French document 2,470,083 a device for lifting and lowering formwork panels. In this device, the column acting as a mast consists of at least two vertical hollow guide columns inside which the wheels of a carriage move. In addition, these columns are fixed and cannot be folded around the base frame without being dismantled.

The system described in Great Britain patent 1 152 470 consists of two notched vertical masts along which a stud bar is fixed.

The device, according to the invention lifting device, comprising a movable receiving platform part moving along a vertical part, characterized in that the vertical part is a single mast.

This platform is suitable for receiving formwork panels or other materials and materials from below.

To adapt the platform to different ceiling heights, the single mast can be adjusted in height by stackable elements, for all heights varying from 2 to 6 m and more.

This platform is foldable, to reduce its size to allow the passage of doors and access to floors. All these elements constituting the device according to the invention are removable to facilitate manual transport, in the case of difficult access to many floors.

DESCRIPTION OF THE DEVICE

This platform consists of elements, identified on the attached drawings, which represent by way of nonlimiting examples an embodiment of this platform.

• Figure 1 is a perspective view showing the entire device in the working position.
• Figure 2 is a perspective view, showing on a larger scale, the articulation of the folded mast.
• Figure 2a is a perspective view showing on a larger scale, the articulation of the mast in the working position.
• Figure 3 is a perspective view, showing on a larger scale the entire carriage.
• Figure 4 is a vertical sectional view of the carriage, in the first variant for manual winch, with the guide rollers.
• Figure 4a is a cross-sectional view of the carriage, and of the single mast.
• Figure 5 is a vertical sectional view showing on a larger scale the trolley, in a second variant, provided with a parachute device for the version of an electric winch device.
• Figure 6 is a perspective view showing the entire device in the mast descent position using the winch for folding the device.
• Figure 7 is a perspective view showing the entire device in the folded position.

The invention will be clearly understood with the aid of the description of the elements which follows:

The device comprises a welded chassis 1 on which a mast 3 is fixed in an articulated manner along which a mobile carriage 16 moves, preferably supporting a platform, under the action of a cable pulled by a manual or electric winch.

The chassis 1 mounted on four steerable wheels 2 provides the platform with great stability.

A single mast 3 elongated in tube form, of rectangular or square section or in profile, is articulated at its base around a horizontal axis; and is adjustable in height by elements 4 which can be dismantled by interlocking; the mast rests on the chassis and is fixed to it by a pin 5 which allows the articulation of the mast around the horizontal axis. A locking system 9 to the winch support 12 keeps the mast in the vertical position, and another locking system 6 to the chassis ensures a second fixing of the mast.

A mast head 10 fits on the upper part of the mast or of the elements, and being removable by interlocking carry the two pulleys 11 cable guide each located on either side of the mast.

The winch support 12 in tube lattice, is articulated 13 on the chassis around two horizontal axes, and held by two struts 14 connecting the upper part of the winch support to the chassis this support thus contributes to the rigidity of the mast and of the 'together, by the locking constituted by the spindle 9. This support carries a manual or electric winch 15.

A mechanically welded mobile carriage 16 slides along the mast by means of four rollers 17, the axes of which are mounted on the carriage and the running surface of which rests on at least two rolling tracks located on two opposite sides of the mast.

This carriage is actuated by a cable 18 winding on the winch.

A winch 15 which winds or unwinds the cable 18 which, passing along the mast and on the pulleys 11 is attached to the mobile carriage and, which has the effect of raising or lowering the mobile carriage.

An arrow 19 in folded sheet metal, platform support, is fixed by stirrups 20 on the mobile carriage.

A receiving platform 21 in folded sheet metal, adjustable in height by pinning 22 on the boom.

• LE CHASSIS 1 est formé de deux longerons parallèles 23 en tube, reliés par un tube 24 sur lequel la partie inférieure du mât sera fixé, et par une traverse 25 qui sert de support du mât, en position couchée pliée.

Detailed description of the elements:

• THE CHASSIS 1 is formed by two parallel longitudinal members 23 in tube, connected by a tube 24 on which the lower part of the mast will be fixed, and by a cross-member 25 which serves to support the mast, in the folded lying position.

At the ends of the two side members 23 four steerable wheels 2 are fixed on plate 26 two wheels are braked at the rear by current means.

On the tube 24 is fixed an articulation of the mast, two flat bars 27 a pin 5 receive the mast.

At the rear of the two flat bars 27 a locking system 6 ensures the mast is locked in the vertical position.

On the crosspiece 25 two tabs and a pin 28 lock the mast in the folded position.

THE VERTICAL MAT 3 is made up of a single profile, of variable height, mast extension elements which can be nested one after the other, of variable height with sleeves, can be fitted at the head of the mast, to allow to have the height of the device, according to the request of the use, so that the platform reaches the height of 2 m to 6 m and more.

The single mast rests on the articulation by the spindle 5 and is blocked by the lock 6 at the rear of the mast in the working position. In the folded position, the mast rests on the cross-member 25 and is locked by the pin 28. At the rear of the mast and at the bottom, a tab 29 welded to the mast, makes it possible to immobilize the carriage 16 by the pin 30 for mounting. or folding, and transporting the device.

THE MATTE HEAD 10 fits at the end of the mast, or to the mast elements. A profile 31 forms the bracket and is U-shaped upside down, inside which there are two pulleys 11 and the passage of the cable. The U-profile is horizontal. A flat iron 32 welded to the upper part of the mast head serves as a stop at the end of the travel carriage 16. The profile 31 has a narrower width than the mast, passes through the mast head right through; and the two upper rear rollers of the carriage, can pass on either side of this profile 31 so that the top of the carriage can coincide with the top of the mast.

THE WINCH SUPPORT 12 in tube lattice, is fixed to the rear end of the chassis by two articulations 13 to allow the folding of the device.

The winch support is held by two struts 14, in tubes fixed by pins, removable.

At the head of the winch support, a fixing is fixed, to lock the mast by a pin 9 in the working position. At the end in the upper part of the winch support, a roller 33 fixed on two welded legs 34 facilitates the deflection and support of the cable 18 at the time of the mast mounting and folding operation.

THE MOBILE TROLLEY 16 in a first variant for manual winch, the trolley is composed of a vertical element 35 made of sheet metal folded in a U shape, this element 35 surrounds the mast on three sides.

Inside this element 35 are fixed four rollers 17, two upper rollers at the rear of the mast, and two lower rollers at the front of the mast, these rollers roll on tracks on the rear and front faces and ends of the mast and mast extension elements are also fixed inside, four studs 36 two upper at the front of the mast, and two lower at the rear of the mast, serve as security, and prevent the carriage from pivoting.

On this carriage is fixed a vertical frame 37 which serves to receive the removable arrow 19.

To reinforce this assembly, gussets 38, are arranged on each side of the element 35; they are formed of a vertical part in shape rectangle welded on one side to the element 35, near the end of the U wing; and of a horizontal part 39 in the shape of a triangle, welded to the upper part of the U wing, and to the upper part of the frame 37.

In these horizontal parts 39 are formed along the frame 37 openings 40 intended to allow the anchoring of the arrow 19.

Below and at the front of the carriage, a pin 41 receives the loop of the lifting cable.

In the ends of the wings of the element 35 are made two holes 42 to allow the passage of the spindle 30 which cooperates with the tab 29 welded to the mast, to allow to immobilize the carriage. The traction of the winch then makes it possible to raise or lower the mast when mounting or folding the device.

THE MOBILE TROLLEY 16 in a second variant, for electric winch is different from that described above.

The manual winch 15 is replaced by an electric motor winch, the control of which is located on the winch support 12.

In this option, a parachute brake device is installed in the mobile carriage 16, and is capable of stopping in the event of a break in the lifting cable, the fall of the carriage, and of its assembly. Precise description of the system (Figure 5).

At the front and inside the carriage 16 an eccentric cam 43 rotates about its axis 44 comes to bear against the mast at the front, and over the entire width of the latter, and blocks the carriage 16.

A spring 45 hooked to the element 35 maintains the feeler 46 in abutment against the cable 18 in tension.

In the event of an operating incident, causing the tension in the cable 18 to decrease, it no longer opposes the pressure the probe 46, integral with the eccentric cam 43; the spring 45 then rotates the cam 43 about its axis 44.

By turning, the eccentric cam 43 comes to bear against the mast 3, the weight of the carriage and of its assembly, being applied on the axis of the cam 44 accentuates its rotation which causes an instantaneous blocking of the carriage.

In this position, the carriage is blocked by jamming on the one hand; by the cam 43 at the front of the carriage and on the other hand, at the rear of the mast by the two upper rollers 17 and two lower studs 36.

A brake lining 47, glued against the cam 43, promotes adhesion in contact with the mast.

After operation of the parachute device, a new tension of the cable 18 lifts the carriage and immediately unlocks the cam, and releases the carriage from the mast.

ARROW 19 is a folded sheet metal assembly provided with two stirrups 20 which hook onto the frame 37 of the mobile carriage 16.

At the end of the jib two vertical tubes 48 serve as platform support and have two pins 22, for adjusting the height of the platform.

THE RECEPTION PLATFORM 21 is a folded sheet assembly, two vertical square tubes 49 are perforated every 5 cm to allow the height of the platform to be adjusted according to use.

These tubes 49 fit into the tubes 48 of the boom.

The platform is fixed by pins 22.

This platform is covered with a rubber plate, to prevent slipping of the supported material.

THE CABLE 18 fixed to the mobile carriage 16, by la.broche 41, goes up along the mast at the front, goes through the two pulleys of the head of the mast 10 and goes down again to wind up with the winch 12.

THE WINCH 12. By turning the crank (s), the cable 18 is wound on the winch drum, or it is unrolled, which has the effect of raising or lowering the mobile carriage 16 and its boom and receiving platform assembly. The winch is fitted with an irreversible automatic brake device.

The manual winch can be replaced by a winch with an electric motor, with electro-brake and load limiter.

DISASSEMBLY OF THE DEVICE

To improve the conditions of use of the device according to the invention, the device is foldable and reduces its size, and facilitates its movement during transport, and allows passage through doors and stairs for access to the floors.

Figure 6 shows the device in the descent or ascent position of the mast.

Figure 7 shows the folded device with its built-in table and boom elements.

• - Dépose de la plateforme de réception 21
• - Dépose de la flèche 19
• - Verrouillage du chariot mobile 16 en position basse, au moyen de la broche 30 à la patte 29.
• - Déverrouillage du mât : dépose de la broche 9 et fixation 6.
• - Descente du mât, sur l'articulation de la broche 5, à l'aide du treuil 15 manuel ou électrique. Le chariot 16 étant verrouillé au mât, le déroulement du câble 18 par le treuil, permet alors de descendre et de retenir le mât, afin que celui-ci se repose horizontalement sur la traverse 25 où il est maintenu et verrouillé à l'aide de la broche 28.
• - Déboîtement de la tête de mât 10.
• - Déboîtement des éléments 4 de mât, puis emboîtement de la tête de mât au mât 3.
• - Pose de la table 21 à l'avant et dessus le châssis 1.
• - Pose de la flèche 19 dans sa position, sur le mât 3 plié.
• - Désacouplement des deux jambes de force 14 du support treuil 12.
• - Articuler le support treuil 12 et le reposer sur la flèche 19.
• - Manoeuvrer le treuil, pour enrouler le câble, qui celui-ci permet de tenir rigide l'ensemble des éléments de l'appareil plié.

Description of disassembly:

• - Removal of the reception platform 21
• - Removal of the boom 19
• - Locking of the mobile carriage 16 in the low position, by means of the pin 30 to the tab 29.
• - Unlocking the mast: removing the pin 9 and fixing 6.
• - Descent of the mast, on the articulation of the spindle 5, using the manual or electric winch 15. The carriage 16 being locked to the mast, the unwinding of the cable 18 by the winch, then makes it possible to descend and retain the mast, so that it rests horizontally on the crosspiece 25 where it is held and locked with pin 28.
• - Mast head disengagement 10.
• - Disengagement of the mast elements 4, then nesting of the mast head to the mast 3.
• - Installation of table 21 at the front and above chassis 1.
• - Installation of the boom 19 in its position, on the folded mast 3.
• - Decoupling of the two struts 14 from the winch support 12.
• - Articulate the winch support 12 and put it back on the arrow 19.
• - Maneuver the winch, to wind the cable, which allows it to hold all the elements of the folded device rigid.

It should be specified that all the elements of the device: (mast, winch support, struts, carriage) are easily removable, by their fixing pins, and allow manual transport by elements, in the case of a very difficult access.

BENEFITS :

The advantages of this device reside in its simplicity, its speed of implementation and disassembly, as well as its ability to adjust, and its possibilities of long-term reuse.

Its moderate weight allows manual transport.

This device according to the invention is used for raising or lowering formwork elements for masonry slabs; it can also be used to raise or lower other objects, including equipment, construction materials.

For example: with two devices, handle iron or wood beams, and mount them on the ceiling for a floor reinforcement.

This device can be used for many similar purposes.

Another variant is to replace the boom 19 by a bucket, a fork, a nacelle or other device; to allow the use of the device as a material lift, stacker, pallet truck, freight elevator, human gondola, or other uses.

A longer boom than that described and shown above with one or more hooks, can be used to transform this manual or electric lifting device into a handling machine to lift loads at heights from 0 to 6 meters and more; and particularly where can not access current machines.

Claims (10)

1 - Lifting device, comprising a movable part, platform 21 moving along a vertical part, characterized in that the vertical part is a single mast. 2 - Apparatus according to claim (1) characterized in that the vertical mast is a rectangular or square section tube which can be extended by several elements, of different dimensions, which fit into each other and which allows pass and adjust the device according to the ceiling heights. 3 - Apparatus according to claim (2) characterized in that the vertical and single mast is articulated at its base on the chassis, for folding the apparatus and locked on the chassis by the fixing 28. 4 - Apparatus according to claims (1) and (2) characterized in that the movable part is connected to the vertical mast by a carriage, comprising four rollers, two upper rollers at the rear of the mast, and two lower rollers at the front of the mast. 5 - Apparatus according to claim (4) characterized in that the carriage can be provided with a parachute brake at the front of the mast and inside the carriage by an eccentric cam 43 which rotates around its axis 44 and comes to rest against the mast at the front and blocks the carriage. 6 - Apparatus according to any one of the preceding claims characterized in that the winch support 12 is articulated at 13 on the frame and which can be folded over the mast when the latter is folded. 7 - Apparatus according to any one of the preceding claims characterized in that the head of the mast 10 returns to the end of the mast, folded position, the cable is wound winch with tension which blocks the winch support, the mast head, and the assembly to the chassis, which facilitates manual handling and transport. 8 - Apparatus according to claim (7) characterized in that the profile 31 of the mast head 10 is a U-shaped iron upside down. 9 - Apparatus according to claims (4) and (5) characterized in that the carriage is composed of a vertical element 35 made of sheet metal folded in a U shape and surrounds the mast on three sides. 10 - Apparatus according to any one of the preceding claims characterized in that the design of the carriage allows to hang at the front thereof various forms of accessories to raise or lower various objects; and by the fact that the design of the mast head allows so that the top of the carriage can coincide with the top of the mast.

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