EP1129977A1 - Platform for material hoist - Google Patents

Abstract

Carriage (6) has a main frame (13) cooperating with the ladder and a secondary frame (14) which is free in translation relatively to the main frame between a high (A) and a low position (B). The secondary frame is attached to one end of the cable (12) so that the carriage is maintained in the high position by the cable tension until when the main frame reaches the lower position.

Description

The present invention relates to material lifts, of the kind of those formed by a ladder or beam structure serving as raceway for a carriage capable of supporting a load, and comprising a motorized cable winch used to tow the carriage along of the raceway, the cable which connects the winch to the carriage passing over a return pulley located on the head of said structure. More in particular, the invention relates to a material hoist of this kind, in which the carriage carries a tilting skip, capable of receiving a material such as concrete that can be spilled by tilting the grab.

Material lifts of the kind considered here, known by example by document FR 2683516 A, allow to bring charges in height, from the ground, in particular to raise construction up to the roof level of a building, during construction or renovation.

When it comes to bringing and pouring concrete at the level of the roof, you can use a dump body hoist, receiving the concrete. When the carriage, pulled by the winch along the path bearing, reaches its upper end position, at top of the ladder or beam structure, the bucket is tilted towards the front to pour the concrete where it is to be poured.

In this particular use of material lifts of the kind here concerned, it is necessary to be able to bring the carriage, and more particularly the bucket, as close as possible to the ground to carry out the concrete loading of the bucket from a concrete mixer current. In addition, with regard to the upper end position carriage, this carriage and its bucket must be brought as close as possible to the upper end of the ladder or beam structure, so that the tilting of the bucket takes place beyond the head of said structure and, in particular, beyond the cable return pulley which is located at this place.

Given the usual sizing of material lifts, and in particular their carts, there is a difficulty here for, on the one hand, being able to bring the grab as low as possible for its loading and, on the other hand, bring the same bucket foremost, beyond of the head of the ladder or beam structure, in order to pour the concrete in front of this head. This problem is particularly related to the fact that the horizontal axis of support and tilting of the bucket occupies usually a fixed position, relative to the carriage.

The present invention aims to solve this problem, by providing a hoist of the kind concerned, including the receptacle or load support, in particular consisting of a tilting skip, can both be brought very close to the ground when the cart is in the end position of low stroke, and be brought very forward when the carriage reaches its high end position, the proposed technical solution remaining simple from the point of view of structure and operation.

• la traction exercée sur le câble maintient le cadre mobile en position haute ou avancée par rapport au châssis principal du chariot, ce châssis pouvant ainsi être entraíné par l'intermédiaire du cadre, et
• seulement lorsque le châssis principal du chariot atteint sa position de fin de course basse, le cadre mobile peut être déplacé en translation relativement audit châssis vers sa position basse ou reculée.

To this end, the invention essentially relates to a material hoist of the type concerned here, in which the carriage comprises, on the one hand, a main chassis directly mounted rolling on the raceway formed by the ladder structure or in beam, and secondly, a movable frame mounted movable in translation, parallel to said raceway, on the main chassis, so as to be able to be moved between a high or advanced position and a low position or moved back relative to this chassis , the movable frame receiving a support or load receptacle, such as a tilting skip, and this movable frame being linked to one end of the cable actuated by the winch, so that:

• the traction exerted on the cable keeps the movable frame in a high or advanced position relative to the main chassis of the trolley, this chassis being able to be driven through the frame, and
• only when the main chassis of the carriage reaches its low end-of-travel position, the mobile frame can be moved in translation relative to said chassis towards its low or retracted position.

Thus, the invention provides a carriage configuration, allowing to a part (movable frame) of this carriage to describe a race extra, and in particular an extra run down, bringing the support or load receptacle very close to the ground, without prevent this support or load receptacle from reaching also very before, when the carriage arrives in the upper end position. The mechanism proposed for this purpose is particularly simple, since it does not requires no special means to move the movable frame relatively the main chassis of the trolley, the cable activated by the winch sufficient to obtaining all displacements, in combination with simple limit stops and contacts.

Admittedly, document EP 0341563 A already provides, in a material lift of the kind concerned, a carriage comprising a chassis main, mounted rolling on the raceway formed by the structure ladder, and a frame movable in translation on the main chassis, parallel to the raceway, but this document does not indicate the purpose of this provision, and in particular it does not explain in which operating circumstances the movable frame would move relative to the main chassis; the movable frame being connected by a spring to the base chassis, it is apparently a simple suspension.

In addition, this document does not specify how the cable traction is linked to the carriage; in particular, it is not specified whether this cable is attached to the base frame or the movable frame, while this point is particularly important for determining the operation of the material lift according to the present invention.

• lorsque le chariot est en position de fin de course basse, la course supplémentaire du cadre mobile vers le bas amène la benne très près du sol, pour faciliter son chargement, notamment son remplissage en béton à partir d'une bétonnière ;
• lorsque le chariot atteint sa position de fin de course haute, la position avancée du cadre mobile sur le châssis principal permet au basculement de la benne de s'effectuer en avant de la tête de la structure en échelle ou en poutre, le déversement du matériau tel que béton se faisant ainsi en avant de la poulie de renvoi du câble.

In a preferred embodiment of the present invention, the load receptacle is a tilting skip, and the mobile frame of the carriage has lateral bearings for supporting and pivoting the tilting skip, the overall configuration then being such that:

• when the carriage is in the lower end position, the additional movement of the movable frame down brings the bucket very close to the ground, to facilitate its loading, in particular its filling with concrete from a concrete mixer;
• when the carriage reaches its upper end position, the advanced position of the movable frame on the main chassis allows the tipping of the bucket to be carried out in front of the head of the ladder or beam structure, the material being spilled such as concrete thus being done in front of the cable return pulley.

To ensure the translational movement of the mobile frame, relative to the main chassis of the carriage, the movable frame comprises advantageously lateral guide rollers, mounted in main chassis side rails; these slides are closed, at less at their upper ends, to form stops which position the movable frame, relative to the main chassis, in its high or advanced position, and which allow the chassis to be driven main through the framework.

The movable frame also advantageously comprises, in its central part, a tab or clevis used for mooring the end corresponding cable operated by the winch.

According to a particular embodiment of the invention, the chassis main carriage consists of two opposite "U" half-chassis, assembled together in a removable manner by their respective side members, formed by angles, the meeting of these angles forming the side rails, in which the movable frame is trapped when the two half-frames are assembled together, while the separation of these two half-chassis allows the assembly or disassembly of the mobile frame.

Figure 1 est une vue d'ensemble, de côté, d'un monte-matériaux conforme à la présente invention, avec indication de plusieurs positions du chariot ;

Figure 2 est une vue en coupe transversale, à échelle agrandie, de ce monte-matériaux avec son chariot ;

Figure 3 est une vue de côté du chariot et de son chemin de roulement, en correspondance avec la figure 2 ;

Figure 4 est une vue en perspective éclatée du chariot seul.

The invention will be better understood with the aid of the description which follows, with reference to the appended diagrammatic drawing representing, by way of example, an embodiment of this material lift:

Figure 1 is an overall side view of a hoist according to the present invention, with indication of several positions of the carriage;

Figure 2 is a cross-sectional view, on an enlarged scale, of this hoist with its carriage;

Figure 3 is a side view of the carriage and its raceway, in correspondence with Figure 2;

Figure 4 is an exploded perspective view of the carriage alone.

Figure 1 shows, schematically, a material lift which includes a structure 1 in the form of a ladder or beam, and more particularly, in the example illustrated, in the form of a truss of triangular section (see also figure 2). Structure 1 is made up of a succession of elements fitted into each other, in particular rectilinear elements, and a curvilinear connecting element or “Knee pad” 2. The lower end of structure 1 rests on the ground 3, while its upper part is located at the level of the roof of a building 4 under construction or renovation. Thanks to the toggle 2, the upper element (s) of structure 1 have a inclination adapted to the slope of the building's roof 4.

Structure 1 forms, by two of its members 5, a path of rolling for a carriage 6, and more particularly for a carriage equipped with a tilting skip 7, pivotally mounted around an axis horizontal 8.

A motorized cable winch 9 is provided at the lower end of the structure 1. The head 10 of the structure 1, opposite the winch 9, is equipped with a return pulley 11, over which passes a cable 12 which is operated by the winch 9 and which is used to tow the carriage 6 along the bearing 5, the end of the cable 12 being linked to the carriage 6 (in a way specified below).

Referring also to FIGS. 2 to 4, we will now describe, in detail, the realization of the carriage 6. This comprises, on the one hand, a main frame 13 and, on the other hand, a movable frame 14, the bucket tilting 7 being carried by the movable frame 14.

The main chassis 13 is itself constituted, like the shows FIG. 4, of two opposite half-chassis in “U” shape 15 and 16, each half-frame 15 or 16 comprising two longitudinal members, formed by angles, connected at one end by a crosspiece. The two half-chassis 15 and 16 are joined and assembled to each other, by screwing, so that their corresponding longitudinal members, joined together, form two slides lateral 17, closed at their upper and lower ends by the sleepers.

One of the half-chassis 15 carries lateral guide rollers 18, grouped in pairs, which take place on either side of the path bearing formed by the structure 1.

The movable frame 14 has two triangular side parts 19, interconnected by crosspieces 20. The two lateral parts triangular 19 carry, respectively, two lateral bearings 21 of support and pivoting of the tilting skip 7, the latter being provided side pins resting in the bearings 21.

The movable frame 14 comprises lateral guide rollers 22, which are engaged and trapped in the side rails 17 of the chassis main 13. Given the length of these slides 17, the frame mobile 14 is movable in translation, on the main chassis 13, between a high or advanced position A (figure 3) and a low or moved back position B (see Figure 1, below). These two positions are defined by stops resulting from the elements (crosspieces) which close the slides 17 at their upper and lower extremities. In particular, an upper stop is formed by the ends of a cross member 23 of the half-frame 15.

One of the crosspieces 20 of the movable frame 14 comprises, in its central part, a tab or clevis 24, projecting from the side opposite the tipping body 7. The end of the cable 12, actuated by the winch 9, is moored to lug or clevis 24, via a pin transverse 25, a parachute device being provided at this location.

When the carriage 6 occupies an intermediate position any on the raceway, the movable frame 14, retained by the cable 12, occupies its high or advanced position A, relative to the chassis main 13, which occupies its lowest position by the effect of gravity. The actuation of the cable 12 by the winch 9, in one direction or in the other, drives the movable frame 14 up or down, the chassis main 13 "following" the frame 14. Thus, the carriage 6 is driven by through its movable frame 14, which carries the tilting skip 7.

When the carriage 6, moved down, reaches its position of lower limit switch (see figure 1, below), the main chassis 13 is first stopped by a stop. From there, the movable frame 14, moved directly by cable 12, can still describe a certain race towards the bottom, bringing it (relative to the main chassis 13) in its position low or remote B. The tilting skip 7, carried by the movable frame 14, is thus brought itself into a low position, very close to the ground 3, which facilitates its loading, in particular its filling with concrete, according to arrow F, from a concrete mixer (not shown).

When the carriage 6, moved upwards, reaches its position of upper limit switch (see Figure 1, above), the movable frame 14 which found in high or advanced position A, relative to the main chassis 13, arrives in a very advanced position, at the level of the head 10 of the structure 1. The tilting of the bucket 7 can then be carried forward of head 10 of structure 1, as shown in the dashed line of figure 1. The pouring of concrete to be poured thus takes place in front of the return pulley 11 of cable 12.

The functioning of the winch 9 is controlled by contacts of limit switch, not shown, which intervene when the carriage 6 reaches its lower and upper limit positions. In particular, the lower limit switch is arranged to be actuated by the movable frame 14 (and not by the main frame 13), to allow frame 14 to carry out its additional downhill stroke, while the chassis 13 is already stopped in its lowest position.

• par des modifications de détail de la structure du châssis principal et/ou du cadre mobile du chariot ;
• par l'application du même dispositif à un chariot dont le support ou récepteur de charge est autre qu'une benne basculante ;
• par l'utilisation de ce dispositif sur un monte-matériaux dont la structure en échelle ou en poutre possède toute inclinaison adaptée, un montage vertical de cette structure n'étant pas à exclure.

One would not depart from the subject of the invention, as defined in the appended claims:

• by modifications of detail of the structure of the main chassis and / or of the mobile frame of the carriage;
• by applying the same device to a cart whose support or load receptor is other than a tilting skip;
• by the use of this device on a material hoist whose ladder or beam structure has any suitable inclination, a vertical mounting of this structure cannot be excluded.

Claims (5)

Material lift, consisting of a ladder or beam structure (1) serving as a raceway (5) for a carriage (6) capable of supporting a load, and comprising a motorized cable winch (9) used to tow the carriage (6) along the raceway (5), the cable (12) which connects the winch (9) to the carriage (6) passing over a deflection pulley (11) located at the level of the head (10) of said structure (1), characterized in that the carriage (6) comprises, on the one hand, a main chassis (13) directly mounted rolling on the raceway (5) formed by the ladder or beam structure (1 ), and on the other hand, a movable frame (14), mounted displaceable in translation, parallel to said raceway (5), on the main chassis (13), so that it can be moved between a high or advanced position ( A) and a low or remote position (B) relative to this chassis (13), the movable frame (14) receiving a support or receptacle for cha rge, such as a tipping body (7), and this movable frame (14) being linked to one end of the cable (12) actuated by the winch (9), so that: the traction exerted on the cable (12) keeps the movable frame (14) in the high or advanced position relative to the main chassis (13) of the carriage (6), this main chassis (13) can thus be driven via the frame (14), and only when the main chassis (13) of the carriage (6) reaches its lower end-of-travel position, the movable frame (14) can be moved in translation relative to said chassis (13) towards its low or retracted position (B). Material lift according to claim 1, characterized in that the load receptacle is a tilting skip (7), in that the movable frame (14) of the carriage (6) carries lateral bearings (21) for support and pivoting of the tilting skip (7), and in that, when the carriage (6) reaches its upper end position, the advanced position (A) of the movable frame (14) on said main chassis (13) allows tilting of the bucket (7) to be carried out in front of the head (10) of the ladder or beam structure (1). Material lift according to claim 1 or 2, characterized in that the movable frame (14) of the carriage (6) comprises rollers lateral guides (22), mounted in lateral rails (17) of the chassis main (13) of the carriage (6), the slides (17) being closed, at least at their upper ends, to constitute stops (23) which position the movable frame (14), relative to the main chassis (13), in its high or advanced position (A), and which allow the drive of the main frame (13) via the frame (14). Material lift according to claim 2 or 3, characterized in that the movable frame (14) of the carriage (6) comprises, in its part central, a tab or yoke (24) used for mooring the end cable (12). Material lift according to any one of the claims 1 to 4, characterized in that the main chassis (13) of the carriage (6) is consisting of two opposite U-shaped half-frames (15, 16), assembled between them in a removable manner by their respective beams, formed by angles, the meeting of these angles forming the side rails (17), in which the movable frame (14) is made prisoner when the two half-frames (15, 16) are assembled together, while the separation of these two half-chassis (15, 16) allows the mounting or dismounting of the movable frame (14).

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