DE8508047U1 - Lifting device - Google Patents

Description

EUROPEAN PATENT ATTORNEY TELEPHONE CÖ711J a44OOa

MANDATAIRE EN BREVETS EUROPtENS TRLEX 7 al βββ ra * ok d

7032 Sindelfingen -ρ 49 -

Lifting device for loads

The invention relates to a lifting device for loads such as wall or ceiling mounting, consisting of a particular mobile floor frame, a vertical mast and a lifting platform guided on the mast, which by means of a is height adjustable in a lower area of the mast supported lifting device.

Lifting devices of the aforementioned type are mainly used in the interior construction of buildings, halls and the like lifting of certain heights or components to be laid on the ceiling, for example sections of ventilation ducts, Cable ladders for electrical. Installations, suspended ceilings and their individual parts, etc.

In an assembly lift known from DE-GM 84 04 119 the mast, which is designed for lifting heights of up to 8 m, can be composed of several partial lengths, with the lowest Mast base is attached to the chassis frame. There is a roller carriage encompassing the mast, to which the lifting platform is attached is lifted by means of a hand-operated cable winch, taking into account the accident prevention regulations No area of the lifting platform except for the cable winch arranged on one side of the conveyor mast are sufficient. For this reason, the lift is designed as a fork that extends on one side of the mast executed. As a result of the loads acting on the conveyor mast on one side, bending moments result, which means greater strength make it necessary with increased effort and weight.

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In addition, the forces acting on one side of the mast via the lifting fork also require a correspondingly wide range Support base on the chassis frame.

In view of the fact that, in spite of the various measures, there is only a limited degree of security is and the assembly lift is not approved for the transport of people, the known construction arises as' relatively expensive, especially as difficult to transport.

The invention is based on the object of a lifting device for loads corresponding to the general ones mentioned at the beginning To the extent to simplify construction that by using an improved construction principle a Lightweight construction can be used, the device can be collapsed in the smallest of spaces and with a small amount of space Workload can be achieved relatively quickly large lifting heights.

To solve this problem, it is proposed according to the invention that the mast be at least three telescopic into one another includes slidable guided tubular sections, that at the lower mast section with the largest pipe cross-section to this parallel a hydraulic cylinder with one on his downwardly extendable piston rod end mounted rope pulley is attached over the one from the lower end outgoing from the middle mast section, through a pulley mounted at the upper end of the lower mast section deflected and fixed at its other end rope is guided,

that extends between the upper and middle mast sections, and that of the upper one, the lifting platform load-bearing mast section by means of a second rope extending from its lower end, which is extends between the middle and upper mast sections and has one at the top of the middle Mast section is in drive connection.

According to the basic idea of the invention, the lifting device can be opened by using a telescopic mast to merge the narrowest space. Since the lifting device is automatically actuated with the aid of the hydraulic cylinder, Due to the accident prevention regulations, it is possible to move one to opposite sides of the conveyor mast Attach a lifting platform that extends evenly or runs symmetrically to the mast axis. Based on these Symmetry in connection with the telescopic version of the mast allows the center of gravity of any loads Concentrate or align the mast axis so that only small bending moments occur and a cost-saving one Lightweight construction is made possible.

Advantageously, the hydraulic cylinder can also be relatively short and thus priced, because it is only half the length of the lower mast section extends. The rope pulley at the end of the piston rod acts on the one attached at one end Rope corresponding to a drive transmission in the transmission ratio 2: 1, so that with half the length of the lower hydraulic cylinder a double stroke is available for extending the middle mast section. The upper mast section is about his

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Cable connection as fast as the middle mast section adjusted in height. The hydraulic cylinder is operated either via a small, Easy to use hand pump or with the help of an electrically driven pump of any type.

According to one embodiment of the lifting device according to the invention the telescopic mast sections can be nested cylinder tubes, and the middle and upper Mast sections can have longitudinal grooves made from the outside for receiving the cable extending from their lower end contain. The mutual guidance here requires a certain amount of processing effort, but it is not necessary additional guide and support means.

According to a preferred embodiment, the telescopic Mas tab .schnitte each have a rectangular cross-section and are like this to each other through guide means out that between them each on a cross-sectional side space for the lower end of the lower and upper Mast sections of outgoing ropes remains. With this construction, simple, largely unprocessed Use rectangular tubes from a series production or made of folded and longitudinally welded sheet steel, whereby on the special conditions for accommodating the ropes between the adjacent mast sections are easy to take into account can be taken.

Appropriately, on all four sides of the upper ends of the lower and middle mast sections to horizontal Axles mounted rotatable guide rollers, which rest on the next smaller mast section, and also are on all four sides of the lower ends of the mast sections resting against the inner wall of the next larger mast section Bearing guide rollers.

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The guide rollers preferably consist of ball bearings which are each fastened between the mast sections upper and lower support plate pairs are arranged on transverse pins.

An extremely simple way of assembling and disassembling the device is also given by the fact that the hydraulic cylinder with its closed end ar _: a

ρ * connection from the side of the lower mast section

attached and secured in the vicinity of its other end mutual buckling. Appropriately extends

the hydraulic cylinder near its lower end through an opening on the side of the lower mast section attached holding device. In this way, the cylinder is secured against buckling and can be used after removal

* its holder in the form of a cross pin at the upper end

■ exchanged: or discarded.

There is a particularly advantageous feature of the invention cloth in the inexpensive but appropriate combination of the hydraulic primary drive and the one driven by it Cable pulls of simple design. A simple structure also results from the fact that the piston rod mounted on the free end of the piston rod Rope pulley over the adjustable stroke length between strips attached to the side of the lower mast section or floor frame is secured against rotation of the piston rod.

Characteristic according to a further advantageous feature of the lifting device according to the invention for each rope and each pulley a second rope or a second pulley is provided in parallel or coaxially, and if so the lower ends of the middle and upper mast sections side by side at the same height, cross bolts for hanging of the respective pairs of cables, this results in a symmetrical arrangement of the cables with symmetrical

Applying force to the individual mast sections achieves «which even out the stresses, increasing canting helps to eliminate and finally also complies with the accident prevention regulations with the double rope breakage protection .

GeintiS κΪΓιβϊ uevüjTäüyten ÄUssfühiünyοίϋϊϊΓι can döx. "Lower

Mast section be part of a central support body of the floor frame at its lower end. Preferably the support body comprises two recordings connected to one another at obtuse angles in the horizontal plane, in the horizontal plane Arms with ground rollers arranged at the ends can be inserted.

Further features and advantages of the invention emerge from the following description of exemplary embodiments of the lifting device according to the invention in conjunction with the drawings showing essential details, and from the demands. The individual features can be individually or collectively in any combination in be realized an embodiment of the invention. It demonstrate

Fig. 1 is a side view of an embodiment of the

lifting device according to the invention in the extended state,

FIG. 2 is a plan view of the base frame of the lifting device according to FIG. 1,

Fig. 3 is a plan view of the lifting platform of the lifting device according to Fig. 1,

Fig. 4 is a partially sectioned side view

of the lifting device according to FIG. 1 in the retracted state and

Fig. 5 is a broken side view corresponding to a direction of view from the right of the lifting

in via. Λ.

In the exemplary embodiment shown, the lifting device includes the invention, a floor frame 10 with a sufficient boom width to the lifting mast extending therefrom and the To give the lifting platform sitting on it a good stability. According to FIG. 2, the floor frame consists of a middle support body 18, the two in the horizontal plane obtuse-angled with their apices connected to one another Has recordings 16. The receptacles 16 can consist of pipe sections into which the tubular frame arms 12 introduced and secured with the aid of a connector 22. At the ends of the frame arms 14 are, if necessary lockable floor rollers 12 pivotable about vertical axes stored. The two obtuse-angled receptacles 16 are welded to a lower mast section 20, which in the present case Example is designed as a tube with a square cross-section. According to Fig. Ί the pipe extends downwards to beyond the welded support body 18.

In the lower mast section 20, two mast sections with a smaller cross section are accommodated in a telescopically displaceable manner, which can be adjusted in height by a lifting device described below. At the top of the extended Lifting mast, a lifting platform 84 is attached, which can be designed variably according to FIG. 3.

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With reference to Flg. 4 and 5 one recognizes that in the tubular lower mast section 20, a tubular middle mast section 36 with a rectangular length Cross-section taken 1st. The rectangular shape comes about that according to Flg. 4 on the right between A space 35 lur rope guide remains in the outer and middle mast section. All three other rare there are uniform distances from the inner wall of the lower mast section 20.

Likewise, the tubular upper mast section 78 is executed with a rectangular cross-section, in accordance with FIG. 4 on the right side to the inner wall of the middle Mast section 36 to form a space 45 for accommodating the drive ropes.

A hydraulic cylinder that serves as a drive for the height adjustment 24 has an upper connection eye 28, to which it is connected to two bearing plates 32 by means of a transverse axis 30 or is suspended on the right side in Fig. 4 at the upper end of the lower mast section are welded on. The hydraulic cylinder 24 is via the connection opening 25 with its line, not shown, of a hydraulic hand pump or the like.

In the area of its lower end, the hydraulic cylinder is attached to the side of the mast section 20 in an opening Guide plate added and secured. Also on guide plate 34 are ends 52 of two Ropes 42 held, which are guided and deflected over two pulleys 38 at the free end of the piston rod 26. The rope pulleys 33 are mounted on both sides of the piston rod 26 on a common transverse axis 40.

The two ropes 42, which are guided parallel to one another, extend upwards through the deflection around the rope pulleys 38 the guide plate 34 up to a fixed upper pulley 44. The pulleys 44 are on a common transverse axis 46, which extends through the two support plates 32, on which the hydraulic cylinder 24 is suspended. The ropes 42 run after their deflection on the upper pulleys 44 through the space 35 between the mast sections 20 and 36 to the lower end of the central mast section 36.

According to FIG. 4, in the area of the lower end of the central idast section 36, a transverse section is provided for each cable 42 Bolts 50 attached. The bolts 50 protrude into the space 35 and serve as a connection or Suspension for an eyelet or eye splice attached to the lower end of the ropes.

It can be seen that when the piston rod 26 is extended, the cables 42 due to the fixed points at the ends 52 and on the pulleys 44 are pulled with twice the gear ratio compared to the cylinder stroke, so that the middle Mast section is accordingly quickly raised or extended. When retracting the piston rod 46 through opening a drain valve, not shown, moves the middle mast section due to its own weight and the loads resting on him quickly.

The lifting movements of the middle mast section are guided by upper and lower guide rollers. In Fig. 1 is when fully extended, the minimum distance between these upper and lower guide rollers is shown. At the upper end of the lower mast section 20 support plate pairs 54 are welded on all four sides, between which

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in each case a ball bearing ring 56 is mounted on a transverse axis 58, see FIG. 4. On the side on which the Rope pulleys and the hydraulic cylinder 24 are arranged, there are two outer support plates 55, as shown in FIG. which together with the bearing plates 32 form supports for two further guide rollers 56. The arrangement of double guide rollers on this side is in view of that over there the pulleys and ropes exerted deflection forces sensible.

At the lower end of the central mast section 36 is a lower bearing arrangement consisting of all four Support plate pairs 60 assigned to the sides for guide rollers or ball bearing rings 62 supported therein on transverse axes, which are attached to the inner walls of the lower mast section 20, preferably apply with pretension and roll off; this also applies to the upper guide rollers 56, which are attached to the Unroll the outside of the central mast section.

It can also be seen from FIGS. 4 and 5 that the upper »4a rod also cut 78 in the vicinity of its lower end Contains cross bolts 64, which protrude with one end into the space 45 to there as a suspension for the lower Ends of operating cables 70 to serve. The ropes 70 are guided over pulleys 72 between two support plates 74 at the upper end of the central mast section are stored. The other ends 76 of the cables 70 held together to form a use are on cross bolts between the Bearing plates 32 held at the upper end of the lower mast section. If the middle mast section extends upwards as shown in FIG. 2, the pull on the lower one Mast section fixed ropes 70 up the upper mast section at the same speed; like the middle one Mast section advances.

The guide means for the upper mast section 78 are also analogous to those for the middle mast section designed. At the upper end of the central mast section there are pairs of supporting plates 80 on three adjacent sides welded, between which guide rollers or ball bearing rings 82 are mounted, which are preloaded on abut the upper mast section 76. The pair of bearing plates T4 for the pulleys 72 is extended upwards to in between 5 to store a wider roller 83 with two guide rings. At the lower end of the upper mast section are attached to all four sides facing pairs of support plates 66, in which ball bearing rings or Guide rollers 68 are mounted, which bear against the inside of the central mast section.

The lifting platform 84, which is fastened to the upper mast section 78, for example with the aid of a plug connection, can correspondingly 3 consist of a tubular main beam 88, in which extendable beams 90 with cross beams 92 are held. The cross members can also consist of tubular receptacles and have extendable end sections 94 be provided.

2, 4 and 5 are laterally on the lower mast section two vertical guide strips 86 attached or welded, between which the piston rod 26 mounted pulleys 38 to and fro according to FIG. 4 and thereby to a rotation together with the Piston rod 26 are prevented.

Claims (17)

DIPL ... NG. WILFRID RAECK '· · ..! . \ t. #: I ^ J ·! ": ,, MO .... ™ * .." MANDATAIRE EN BREVETS EUROPEENS TELEX 7 Bi ββο raaoscd M. Fröhlich 7032 SindelfIngen - F 49 - Claims 1.Lifting device for loads, e.g. wall or ceiling mounting, consisting of a particularly mobile floor frame, a vertical mast and a lifting platform guided on the branch, which is height-adjustable by means of a lifting device supported in a lower area of the mast,
characterized, that the mast is at least three telescopic into one another comprises displaceably guided tubular sections (20, 36, 78), that on the lower mast section (20) with the largest pipe cross-section parallel to this a hydraulic cylinder (24) with a piston rod end that can be extended downwards at the sexnem mounted pulley (38) is attached, over which one from the lower end of the central mast section (36) outgoing, deflected by a rope pulley (44) mounted on the upper end of the lower mast section and at its other end fixed rope (42) is guided, which extends between the upper and middle Mast sections (20 or 36) extends, and that the upper, the lifting platform (84) supporting mast section (78) by means of a second rope (70) extending from its lower end and extending between the middle and upper mast sections and over a at the upper end of the central mast section (36) mounted deflection roller (72) runs with the central mast section (36) is in drive connection. MM » 2. Lifting device according to claim 1, characterized in that the telescopic mast sections (20, 36, 78) one inside the other are guided cylinder tubes, and that the middle and upper mast section from the outside introduced longitudinal grooves for receiving each of which contains ropes extending from its lower end, 3, lifting device according to claim 1, characterized in that the telescopic mast sections (20, 36, 78) are rectangular Have cross-sections and are guided by guide means to each other so that between them in each case a cross-sectional side space for the from the lower end of the lower and upper mast sections (36 and 78) emanating Ropes (42, 70) remain. 4. Kebeg jrat according to claim 3, characterized in that on all four sides of the upper ends of the lower and middle mast sections (20 and 36, respectively) around horizontal axes (58) rotatable guide rollers (56, 82) are mounted for the next smaller mast section, and that on all four sides the lower ends of the upper and middle mast section (78 and 36, respectively) on the inner wall of the next larger mast section adjacent guide rollers (62, 68) are mounted, 5, lifting device according to one of the preceding claims, characterized characterized in that the hydraulic cylinder (24) has a stroke length which is substantially half the length corresponds to the lower mast section (20), 6. Lifting device according to one of the preceding claims, characterized in that the hydraulic cylinder (24) with its closed end at a side of the
Is attached lower mast section outgoing connection and secured in the vicinity of its other end against lateral buckling. 7. Lifting device according to claim 6, characterized in that that the hydraulic cylinder (24) near its lower It ends through an opening in a holding device attached laterally to the lower mast section (20) (34) extends. 8. Lifting device according to one of the preceding claims, characterized in that the at the free piston rod end (26) mounted pulley over the adjustment stroke between the side of the lower mast section or the floor frame fastened strips (86) are secured against twisting of the piston rod, 9. Lifting device according to one of claims 4 to 8, characterized characterized in that the guide rollers (56, 82) consist of ball bearings, each between the Mast sections attached upper and lower support plate pairs (54, 80) are arranged on transverse pins. 10. Lifting device according to claim 9, characterized in that "the guide rollers with bias on the associated The surface of the mast section to be guided. 11. Lifting device according to one of the preceding claims, characterized in that in the region of the lower ends of the middle and upper mast sections (36 and 78, respectively), bolts extending transversely through the mast section (50 or 64) are attached, which protrude on one side into the cable guide space and as a pull hook for Recording of the rope ends arranged at the respective rope end 12. Lifting device according to one of the preceding claims, characterized in that to each rope (42, 70) and to each rope pulley (38, 44, 72) parallel or coaxial in each case a second rope or a second pulley are provided, and that at the lower ends the middle and upper mast sections (36 and 78) next to each other at the same height two cross bolts for Suspending the respective pairs of cables are provided. 13. Lifting device according to one of the preceding claims, characterized in that the lower mast section (20) is part of a middle one at its lower end The support body (13) of the floor frame is. 14. Lifting device according to claim 12, characterized in that that the support body (18) is two obtuse angles in the horizontal plane comprises connected receptacles (16), in the horizontal arms (14) with arranged at the ends Ground rollers (12) can be inserted. 15. Lifting device according to claim 1, characterized in that that the mast consists of the lower and middle mast section and the lift on the middle mast section connected. 16. Lifting device according to claim 1, characterized in that that the upper mast section contains one or more telescopically extendable mast sections in addition. 17. Lifting device according to one of the preceding claims, characterized in that the or the upper mast sections are connected to the remaining mast by cables or other drive means.