EP2016017B1 - Supporting arm for a lifting platform - Google Patents

Abstract

The subject matter of the invention relates to a support arm for a lifting platform, comprising at least one relatively wide support arm and an extension arm telescopically slidable therein, the arms each having torsionally rigid and flexurally stiff hollow profiles, a support bearing at the rear end of the accommodating arm for the pivotable hinging connection to a lifting carriage of a column and a bearing foot at the free end of the respective extension arm. A cost-effective production of support arms in different sizes and shapes is obtained by cutting at least the accommodating arm from a steel panel blank and forming it into a hollow profile and providing it with at least one transverse reinforcement.

Description

The invention relates to a support arm for a lift, in particular a stand or pillar lift, with at least one wider pick-up arm and a telescopically displaceable extension arm, each consisting of torsionally and rigid hollow profiles, wherein at the rear end of the pickup support a support bearing is provided via which the support arm is pivoted horizontally to the lifting of a column, and wherein at the free end of the inner Auszugsarms Auflagerfuß is fixed, can be arranged on the various support elements and secured.

Such support arms are known in particular in connection with so-called. Stand-lifts for motor vehicles. At the lifting of a pillar two support arms are articulated on sufficiently rigid bearing assemblies, so that each support arm can be pivoted individually in the horizontal plane. Thus, the appropriate uprising or support elements can be positioned in the respective prescribed positions under the vehicle floor, not only a pivoting of the respective support arms is required, but these must also be adjustable in length, which is achieved by a telescopic design of each support arm. Accordingly, there is a support arm of an inner receiving arm and a coaxial extraction arm, which is longitudinally slidably received in the rearwardly hinged to the lifting arm receiving arm. Since the cantilevered telescopic arms introduce the load of a motor vehicle to be lifted on the support bearing in the lifting and thus in the column, the support arms must have a sufficiently high torsional and bending stiffness to secure support and support of the overlying motor vehicle even when fully extended guarantee. To achieve sufficient rigidity exist so far used supporting arms made of extruded hollow profiles in Vollmantelausführung usually made of relatively high quality steels. The extruded hollow profiles were obtained as starting material from press shops and further processed to support arms of different sizes.

From the DE-A-2 222 035 is a support arm for a car lift known, which is designed as a telescopic pivot arm and carries at its free end a vertically adjustable in several stages Auflagerfuß. Each swivel arm consists of an extruded profile rail with the top open C-shaped cross section and is hinged at its inner end via a pivot bearing on a raised and lowered truss. On the swivel arm a drawer arm is guided manually displaceable, which is formed from a sheet steel blank to a downwardly open C-shaped cross-section and at the two legs of a bottom plate is welded. On the free end portion of the extension arm, an intermediate piece is welded, which is part of an adjustment mechanism for a support plate of the adjustable Auflagerfußes together with bolts and an outer bracket.

In addition to the relatively high cost of extruded profile materials, it is disadvantageous that the manufacturers of lifts and thus their support arms are tied to the sizes and types of the respective profile material, so that the support arms can not be adapted to the specific needs of a specific lift.

The object of the invention is to create a support arm for a lift, which can be produced inexpensively and in almost any size and shape with relatively little effort.

This object is achieved by the features of claim 1.

The support arms according to the invention can be manufactured much more cost-effective than the existing extruded profiles support arms. In addition, the support arms according to the invention can be produced by relatively simple molding operations in a variety of variants and profile cross sections, which was not possible with conventional support arms because of the binding to predetermined cross sections of the particular extruded profile used. To produce the support arms according to the invention are used as starting material hot or cold rolled steel sheets each having a suitable wall thickness in the range of 5.0 to 12.0 mm. From these steel sheets blanks of suitable shape are cut out, which is preferably done by laser cutting. On technically simple and effective bending machines, these flat sheet metal blanks become round or square hollow profiles cold formed. The cross sections of the respective receiving arms and the associated extension arms are chosen so that the respective extension arm can be moved axially displaceable and with relatively little transverse play in the pickup arm.

Although the two arm parts of each support arm, i. the receiving arm and the extension arm, may also have circular or otherwise rounded cross-sections, it is more expedient if at least the wider receiving arm has a square hollow profile and preferably has on its underside a continuous longitudinal slot of predetermined width. The square hollow profile achieves a torsion-proof longitudinal guidance of the extension arm in the wider receiving arm.

In order to give the support arms the necessary strength in lifting operation, each longitudinally slotted hollow profile of a wider receiving arm and also a movable therein extension arm is provided with at least one transverse reinforcement, which may be formed in different ways. If the longitudinal slots of the respective arm have only a relatively small width, point or seam-like welded joints of the edges may be expedient. The positive connection of the two bent, the longitudinal slot limiting longitudinal edges leads to a high torsional and bending stiffness of the respective Tragarmteils, which is comparable to that of a conventional extruded hollow profile. Production-technical and functional advantages are provided as stirrups formed transverse stiffeners, which preferably cover the longitudinal slot in the free end portion of the respective receiving arm and on the outside of the hollow profile permanently, e.g. by welding, are attached.

To obtain a high-strength and easily pivotable articulation of the support arm according to the invention on the lifting of a column, the provided at the inner end of the receiving arm bearing consists of several simple design items that by simple Cutting and bending operations can be produced inexpensively and firmly connected to a stable support bearing construction, in particular welded, are. Expediently, the end-side support bearing on the receiving arm has a transverse plate fixed permanently to the end edges of the hollow profile and two bearing plates arranged at a transverse distance on the arm end, in whose mutually aligned bores a pin formed on the lifting carriage engages. Suitably, a bent longitudinally aligned bearing plate is mounted on the upper side of the receiving arm, which is welded to the transverse plate, for example, or otherwise firmly connected and has the bearing bore in its projecting end portion.

The drawer arm is expediently also designed as a square hollow profile with underside longitudinal slot and carries at its inner insertion end a transverse plate which has a small clearance to the underside of the receiving arm. At the outer end of the Auszugsarms a support plate is fixed by two transverse plates each with welded joints.

To obtain sufficient extension lengths, the support arms can also be formed multi-telescopic, i. in addition to the inner receiving arm and the outer extension arm have a central arm portion which is guided on the one hand slidably in the receiving part and on the other hand serves for longitudinally displaceable receiving the Auszugsarms. This middle arm part also consists of a bent profile produced by bending deformation of a flat sheet metal blank with a continuous longitudinal slot and transverse reinforcement.

Fig. 1

schematisch die Säule einer Kraftfahrzeug-Säulenhebebühne in perspektivischer Darstellung;

Fig. 2

den Ausschnitt A in Fig. 1 in vergrößerter perspektivischer Darstellung,

Fig. 3a bis e

eine Ausführung des erfindungsgemäßen Tragarms in mehreren Darstellungen;

Fig. 4a bis e

ein anderes Ausführungsbeispiel eines erfindungsgemäßen Tragarms in mehreren Darstellungen.

Fig. 5

eine Variante des in Fig. 3a bis e dargestellten Tragarms.

Fig. 6

eine Variante des in Fig. 4a bis e dargestellten Tragarms.

In the following, embodiments of the invention will be described in detail with reference to the drawing. Show it:

Fig. 1

schematically the column of a motor vehicle pillar lift in perspective view;

Fig. 2

the detail A in Fig. 1 in an enlarged perspective view,

Fig. 3a to e

an embodiment of the support arm according to the invention in several representations;

Fig. 4a to e

another embodiment of a support arm according to the invention in several representations.

Fig. 5

a variant of in Fig. 3a to e illustrated support arm.

Fig. 6

a variant of in Fig. 4a to e illustrated support arm.

In the Fig. 1 illustrated column 1 belongs to a double post lift for motor vehicles, but may also be part of a so-called. Four pillars lift. On the designed as a flat steel construction or extruded light metal profile dimensionally stable and sustainable column body 2, a bottom plate 3 is fixed, which is firmly anchored, for example by bolts in the foundation. Within the casing of the column 1, a threaded spindle is arranged, which runs in lower and upper pivot bearings and carries a nut which is connected to a unit called lifting 5 aggregate. The upper end of the threaded spindle is connected to the output shaft of an electric motor 4, which drives the threaded spindle, so that the mother mounted thereon performs lifting and lowering movements.

On the lifting and lowering lift 5, a support bearing assembly 6 is mounted, each having a support bearing 7, 8 for each a horizontal support arm 9, 10. The two support arms 9, 10 are formed the same, so that in the following only one of the two support arms 9, 10 used on each column 1 will be described.

In Fig. 3 is an embodiment of a support arm 9 in a perspective view (a), in the axial longitudinal section (b), in plan view (c), in side view (d) and in an enlarged section (Z in b) shown.

The illustrated support arm 9 is shorter than the support arms 8, 9 in Fig. 2 , but structurally similar to these arm versions. The support arm 9 has as main components a receiving arm 11 and a drawer arm 12, both of which consist of a square steel profile and on its underside have a continuous longitudinal slot, as shown Fig. 3e seen. Both arms 11, 12 are formed from cold or hot rolled flat material, preferably a steel sheet, having thicknesses of <5 mm to> 12 mm.

The receiving arm 11 has at its front end portion of a molded steel sheet bracket 13, which - as from Fig. 3e seen - the formed in the bottom longitudinal slot 14 covered. As shown, the bracket 13 constituting a stiffening element has a C-shaped cross-section and is permanently attached to the outer wall of the receiving arm 11, for example by welding seams 15.

The support bearing 7 includes an upper double-angled bearing plate 17, which has the same width as the receiving arm 11, and is made for example by laser cutting from a sufficiently stable sheet steel blank. The elongate bearing plate 17 has a double angled shape and consists of a rear half-round portion 18 which is fixed to the upper side of the receiving arm 11, for example, welded, from an inclined ascending central portion 19 and from a parallel to the longitudinal axis 23 of the receiving arm 11 aligned end portion 20, in which a bore 21 for receiving a journal 22 (FIG. Fig. 2 ) is trained. On the inner end side of the receiving arm 11 is a perpendicular to the longitudinal axis 23 of the receiving arm extending transverse plate 24 permanently, for example by welding, fixed, the upper edge is fixed to the underside of the tab-like projecting end portion 20 of the bearing plate 17. As in particular from Fig. 3b and 3d can be seen, in the lower third of the transverse plate 24, a further plate 25 permanently, for example by welding, attached, in the one with the Bore 21 aligned bearing bore 26 for receiving the journal 22 ( Fig. 2 ) is trained.

In this embodiment, the extension arm 12 also consists of a square hollow profile, as is made Fig. 3e evident. At the rear end of Auszugsarms 12 serving as a stop block-like flat iron 30 is permanently attached, for example by welding, which slides with its upper side on the underside of the upper wall of the receiving arm 11 with little clearance on the upper edge, as is apparent from Fig. 3b is apparent. The height of this flat bar 30 is matched to the vertical diameter of the extension arm 12 so that a largely tilt-free sliding fit in the interior of the receiving arm 11 is achieved. At the free end of the extension arm 12, a support plate 31 is mounted centrally between an upper and a lower block-like flat iron 33. In the projecting part of this support plate 31, a bore 34 is formed, in which a suitable support member 31 a ( Fig. 2 ) can be used. The two block-like flat bars 32, 33 are permanently connected to the central support plate 31 and also to the walls of the extension arm 12 and form an end-side transverse reinforcement of the extension arm 12, which ensures its sufficient bending and torsional rigidity.

This in Fig. 4a to 4e illustrated embodiment of the support arm 9 according to the invention corresponds in its technical concept and also its structural design as far as possible according to the embodiment Fig. 3a to 3e , so that the same components are also designated by the same reference numerals. To increase the extension length, the in Fig. 4 Support arm shown on a telescopically extendable middle part 40, which is made in the same technology as the rear pickup arm 11 and the front extension arm 12 by laser cutting a sheet steel blank and bending forming a square profile or extruded light metal hollow section. At the front end of this middle part 40 is outside a bow-shaped transverse reinforcement 41, which is permanently connected to the outer walls of the hollow profile, for example by welding.

In Fig. 5 is a variant of in Fig. 3a to 3e illustrated support arm 9 shown as a further embodiment of the invention. This illustrated support arm 9 can on the column 1 after Fig. 1 or be used on another suitable pillar or stator construction of a lifting device. The constructive training and also the mode of operation of this variant Fig. 5 corresponds to those of in Fig. 3a to 3e shown support 9. Different in the execution according to Fig. 5 compared to the execution Fig. 3 is that at the free end of the receiving arm 11 in its upper portion, a cutout 36 is formed, which is bounded by two oblique end edges 37 of the two side walls and a recessed transverse edge 38 of the upper horizontal top wall of the receiving arm 11. By this design measure collisions with certain cantilevered components of the vehicles to be lifted, for example, with so-called. Swellers avoided.

This in Fig. 6 illustrated embodiment of the invention corresponds to the support arm 9 after Fig. 4a to 4e , so that the same components are identified by the corresponding reference numerals. To avoid collisions with protruding vehicle parts, this variant proves Fig. 6 depending on a section 42 and 43 at the free end of the central arm 40 and the receiving arm 11, which - in the same manner as in the variant according to FIG Fig. 5 - Are bounded by two lateral beveled edges 44, 45 and a recessed upper transverse edge.

The invention is not limited to the embodiments described above and shown in the drawing. Thus, instead of the square profiles shown, the receiving arm and / or the extension arm have another profiled cross-sectional shape. Although the bow-like transverse stiffeners 13, 41 from manufacturing technology For reasons of particular advantage, other elements, such as welds can be used instead of this stiffening bracket. Changes are also possible with respect to the support bearing 7 shown, although this design is inexpensive and offers manufacturing advantages. Modifications of individual components should be made so that the individual components can be molded and assembled from simple starting materials during operation to achieve the desired high flexibility with respect to a variety of different embodiments.

Claims (8)

1. A supporting arm for a lifting platform, comprising

   - at least one, relatively wide accommodating arm (11) and an extension arm (12) which can be displaced telescopically therein, the arms each being produced from torsionally rigid and flexurally stiff hollow profiles,

   - a supporting bearing (6) at the rear end of the accommodating arm (11) for pivotable articulation on a lifting carriage (5) of a column (2), and

   - a bearing foot (31a) at the free end of the respective extension arm (12), wherein

   - at least the extension arm (11) is cut from a steel-panel blank and formed into the hollow profile,

   - at least one transverse reinforcement (13) is provided at least on the accommodating arm (11), and

   - at least the accommodating arm (11) has a square hollow profile and a continuous longitudinal slit (14) in one wall.
2. The supporting arm according to claim 1,
   characterized in that
   the transverse reinforcement (13) is formed as a weld seam or as a bracket having a C-shaped cross-section which covers the longitudinal slit (14) and is permanently fixed to the outer wall of the accommodating arm (11).
3. The supporting arm according to claim 1 or 2,
   characterized in that
   the support bearing (7, 8) at the end of the respective accommodating arm (11) has a transverse plate (24) permanently fixed to the end ridges of the hollow profile and two bearing plates (20, 25) disposed at a transverse distance at the arm end.
4. The supporting arm according to claim 3,
   characterized in that
   a bent bearing plate (17) running lengthwise is attached to the upper surface of the accommodating arm (11), which bearing plate is firmly connected to the transverse plate (24) and has a bearing bore (21) at its front end part (20).
5. The supporting arm according to any one of the preceding claims,
   characterized in that
   a block-like stop (30) is attached to the rear end of the extension arm (12), which slides with the upper surface thereof with a clearance on the lower surface of the upper wall of the accommodating arm (11).
6. The supporting arm according to any one of the preceding
   claims,
   characterized in that
   the extension arm (12) is formed by multiple bending from a steel-panel blank into a square hollow profile longitudinally slit on one side and has a support plate (31) provided with an accommodating bore (34) for a support disc at the free end thereof.
7. The supporting arm according to any one of the preceding
   claims,
   characterized in that
   a telescope arm part (40) is disposed between the accommodating arm (11) and the extension arm (12), which arm part is guided in a longitudinally shiftable manner in the accommodating arm (11) and in which the extension arm (12) is movable in a longitudinally shiftable manner.
8. The supporting arm according to claim 7,
   characterized in that
   a cutout (36; 42, 43) defined by bevelled edges (37, 38; 44, 45) on both sides is formed in the upper portion at the free end of the accommodating arm (11) and the telescope arm part (40), respectively.

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