EP3013728B1 - Lifting device for lifting and lowering vehicles - Google Patents

Description

The invention relates to a lifting device for lifting and lowering of vehicles, loads or the like, in particular a two-post lift with pivoting support arms.

From the JP S 62 211299 A a lifting device for lifting and lowering of loads is known, which comprises a movable up and down carrier, in which a load-receiving means is provided. The load receiving means comprises two support arms, which are pivotally mounted about a pivot axis on the carrier. To adjust the position of the support arms, a rack gear is provided on each support arm, which are each controlled by a hydraulic cylinder, wherein two switching contacts are provided, and each of the switch contacts is connected to the two hydraulic cylinders to control a simultaneous activation of a pivoting movement of the two support arms.

From the DE 691 07 560 T2 is a two-column lift known, which consists of two lifting columns and with the lifting columns movable up and down carriers. On each carrier two articulated arms are provided as pivotable support arms, which are pivotable and positionable with their load-receiving element below a vehicle to be lifted to the load receiving points located there. To secure the adjusted position of the support arms to the carrier, a locking device is provided, which is unlocked at a lowered support, so that the support arms are freely pivotable. Immediately after the start of a lifting movement of the carrier, the set positions of the support arms are fixed to the support by the locking device, so that the set Tragarmposition remains preserved to the vehicle. This locking device comprises a frusto-conical gear on which a complementarily formed frusto-conical sprocket can be placed. As a result, a vertical movement between the frusto-conical gear and the ring gear for decoupling and subsequent locking is required. Furthermore, the respective support arm may be arranged only in a predetermined pitch with respect to its pivotal position due to the toothing. For long support arms, the grid dimension has the consequence that the load-bearing elements are far apart in locked pivot points, so that exact positioning of the load-bearing elements of the support arms at the receiving points of the respective vehicle is difficult. Analog is from the FR 75 06246 A1 known.

From the US 4,679,660 is a two-post lift known, which consists of two lifting columns, on each of which a carrier is movable up and down. Each carrier receives two pivotable support arms. These support arms can be controlled with respect to their angular position to each other by means of lifting cylinders. Furthermore, in the lowered state of the carrier, an automatic retraction of the support arms with respect to the extended length can be controlled.

From the DE 27 42 518 A1 is a locking device for a pivot arm of a lift out, which acts directly on a piston rod of a piston which is secured between the carrier and the pivot arm. This locking device is only manually operated.

From the US 4,715,477 Furthermore, a two-column lifting device is known, which comprises two pivot arms on a support. On the support, a locking device is provided, which is released in the lowered state of the carrier to release a pivoting movement of the pivot arm. Upon lifting of the carrier is then a locking of the locking device, provided that the pivot arm is positioned in a predetermined position to a locking rod of the locking device, so that a arranged on a hollow cylinder of the locking device detent element engages in a latch on a cylinder rod which guided in the hollow cylinder is.

The invention has for its object to provide a lifting device for lifting and lowering of vehicles, loads or the like, which a simple and quick release and locking the Locking position of the support arms to the carrier in an arbitrary pivot position within the pivoting range of the support arm allows.

This object is achieved by a lifting device according to the features of claim 1. This locking device has the advantage that a direct adjustment of the pivot angle of the support arm is made possible for the carrier. In particular, such a setting device can fix a set pivoting position of the support arm, which is preferably infinitely adjustable, within the pivoting range of the support arm.

The adjusting device, which is designed as a hydraulic or pneumatic cylinder and having double-acting cylinder equal piston surfaces in the chambers of the actuator, which are connected to an overflow, has the advantage that immediately after a movement when closing the two piston chambers or the Overflow line is given an immediate locking of the pivot position of the piston rod of the hydraulic cylinder, whereby the position of the support arm is fixed, to which a piston rod of the hydraulic cylinder engages. Furthermore, no additional storage for a fluid in the hydraulic cylinder is required. In addition, such a locking has the advantage that it is wear-free over the life of the lifting device.

The locking device provides that the adjusting device can be controlled with a switching valve or switching contact. As a result, the adjusting device can be converted in a simple manner from an unlocked or released position to a locked or secured position. For example, to lock the locking position or securing the pivot position of the support arm, the set position of the support arm can be secured to the support only by blocking the switching valve.

A preferred embodiment of the invention provides that the adjusting device as a hydraulic, pneumatic, electric or electromagnetically driven adjusting device or as a linear drive is trained. By such adjusting devices, the pivoting movements of the support arms can be actively initiated relative to the carrier, controlled and preferably kept fixed in an end position. In addition, this advantageous embodiment of the locking device has the advantage that the pivot arm is free of play to the carrier locked.

An alternative embodiment of the invention provides that the adjusting device is designed as a manually operable adjusting device and in particular comprises a hydraulic or pneumatic cylinder. This arrangement allows a pivotal position of the support arm to be adjusted to the support without the supply of external energy and only by manual operation and the hydraulic or pneumatic cylinder can be kept fixed in this end position.

An advantageous embodiment of the invention provides that the overflow line connecting the piston chamber can be controlled by the switching valve. Thus, a simple structure can be given, which also includes a low profile. The switching valve is advantageously designed at least as a two-way valve which blocks or releases at least the overflow line. Consequently, each once taken position can be secured by switching the switching valve.

A preferred embodiment of the lifting device provides that the piston rod of the adjusting device engages remote from the pivot axis of the support arm to the carrier on the support arm. As a result, favorable leverage ratios can be created to accommodate the required torque, which can act on a maximum Tragarmlänge.

The locking device is preferably pivotally provided on the carrier, wherein a housing of the adjusting device is pivotally mounted on a bearing point of the carrier. In this case, the pivot axis of the pivotally received housing is aligned parallel to the axis of rotation of the support arm. Thereby, a compensating movement of the adjusting device due to the point of application of the piston rod away from the axis of rotation of the support arm done.

The housing of the adjusting device preferably has a bearing journal for forming the bearing, which is rotatably mounted in a bore of a bearing plate of the bearing. This represents a structurally simple arrangement and recording of the adjusting device on the carrier.

Preferably, furthermore, the switching valve can be integrated in the bearing. Preferably, an actuating device or longitudinal axis of the switching valve is arranged concentrically to the pivot axis of the journal.

The pivoting movement of the support arm can be controlled manually. In a manual embodiment, the user will push the support arm into the desired pivotal position by hand or foot. Alternatively, the adjusting device can be controlled with a hydraulic pump or an electric drive. In this case, both a separate drive unit and the drive device of the lifting device can be used, which can be provided for lifting and lowering the carrier.

Furthermore, the switching valve is preferably mechanically switchable with a probe element. Thereby, a simple mechanical solution can be created by which the locking device is automatically unlocked in a lowered position of the carrier and immediately after lifting or better after a minimal stroke of the carrier from the lowered position, an automatic locking of the locking device. Alternatively, a switching valve or switching contact can be electrically controlled. Advantageously, a wireless control of the switching valve or switch contact, for example by means of a remote control, can be controlled.

The lifting device preferably has on the support an at least partially closed housing section with a housing bottom, in which the locking device is provided, said housing bottom having an opening in which the feeler element of the switching valve or switch contact is arranged. As a result, a protected arrangement of the locking device can be provided, wherein nevertheless an automatic release during lifting of the carrier Locking position when lowering the carrier and locking is enabled.

For safe actuation of the feeler element, the underside of a housing bottom is preferably provided with a protective cover assigned to the opening, which covers the opening and is designed as a bending tab. As a result, a protected arrangement of the probe element and the associated switching valve or switch contact can be made possible.

Preferably, in a locking position of the locking device, the probe element protrudes downwards from the outside of the housing bottom, and the protective cover, which is preferably designed as a bending tab, lifts off from the outside of the housing bottom at least in the extent of a switching path of the switching valve. As a result, it is visible from the outside that the locking device is in a locking position. In addition, this can be a simple operation of the probe element allows, since when lowering the carrier, the protective cover rests on the bottom or a base plate of the lifting column and actuates the probe element, wherein the probe element itself is protected by the protective cover and remains protected. This arrangement allows in the off-hook state of the carrier and manually actuation of the locking device by pressing the protective cover to the outside or bottom of the case bottom, which automatically returns to release their own locking position.

Alternatively, for example, a cable, a wire rope or the like attack on the probe element or on the protective cover, which has an operating handle, an actuating loop or an actuating element at the opposite end, so that this example, manually remotely controlled. For example, an end adjacent to the control panel, an on and off control of the control of the lifting device or may be provided on the outer sides of the housing.

A further preferred embodiment provides that two pivotable support arms are arranged on the support, the axis of rotation of which is provided in each case adjacent to the lifting axis of the support. As a result, an arrangement can be created, wherein in particular in a symmetrical arrangement, the axes of rotation of the support arms are spaced at the same distance from the vertical axis of the lifting column.

Furthermore, it is preferably provided that an actuatable by a control of the lifting device actuator comprises at least one control device which is preferably wirelessly controlled. Such an arrangement has the advantage that the operator can control one or more such lifting devices by means of a preferably designed as a remote control unit. Alternatively or additionally, a positioning of the support arms to the load-receiving points on the vehicle can also take place via such a remote control. Furthermore, the carrier is preferably movable up and down along a lifting column or on a lifting ram of a stamping platform or of a half-scissors lift or a double-scissor lifting platform. This arrangement can be used in many ways and adapted to the particular design of the carrier.

Furthermore, the support arms of the load-bearing element preferably have at least two support arm sections, which are pivotably connected to one another and are positioned with one another in the swivel position with at least one locking device. This embodiment of the support arms may be provided as an alternative to a telescopic support arm. In this case, a first support arm, which is arranged on the carrier, as well as at least one further Tragarmabschnitt each be in their pivot position on the load receiving point on the vehicle or the load adjustable.

A further advantageous embodiment of the lifting device provides for two or more lifting columns associated with each other in pairs to form a two-column lifting platform or a multi-column lifting platform. These lifts are advantageously each self-sufficient, so that the opposing lifting devices connecting control lines or static components are dispensable.

• Figur 1 eine perspektivische Ansicht einer eine Zweisäulen-Hebebühne bildenden Hebevorrichtung,
• Figur 2 eine schematische Seitenansicht des Tragarmes und des Trägers der Hebevorrichtung mit einer Verriegelungsvorrichtung in einer verriegelten Position,
• Figur 3 eine schematische Ansicht von oben auf den Tragarm und Träger mit der Verriegelungsvorrichtung gemäß Figur 2,
• Figur 4 eine schematische Seitenansicht der Verriegelungsvorrichtung im Teilschnitt,
• Figur 5 eine schematische Seitenansicht des Tragarmes mit einer Verriegelungsvorrichtung in einer entriegelten Position,
• Figur 6 eine schematische Ansicht von oben einer alternativen Ausführungsform eines Tragarms des Lastaufnahmeelementes,
• Figur 7 eine perspektivische Ansicht einer Verlängerung an einem Tragarm, und
• Figur 8 eine schematische Ansicht des Tragarmes und des Trägers der Hebevorrichtung mit einer Verriegelungsvorrichtung in einer verriegelten Position gemäß Figur 2 mit einer Handentriegelungsvorrichtung.

The invention and further advantageous embodiments and developments thereof are described in more detail below with reference to the examples shown in the drawings and explained. The features to be taken from the description and the drawings can be applied individually according to the invention individually or in combination in any combination. Show it:

• FIG. 1 a perspective view of a two-column lift forming lifting device,
• FIG. 2 a schematic side view of the support arm and the carrier of the lifting device with a locking device in a locked position,
• FIG. 3 a schematic top view of the support arm and carrier with the locking device according to FIG. 2 .
• FIG. 4 a schematic side view of the locking device in partial section,
• FIG. 5 a schematic side view of the support arm with a locking device in an unlocked position,
• FIG. 6 a schematic top view of an alternative embodiment of a support arm of the load-bearing element,
• FIG. 7 a perspective view of an extension to a support arm, and
• FIG. 8 a schematic view of the support arm and the carrier of the lifting device with a locking device in a locked position according to FIG. 2 with a manual unlocking device.

In FIG. 1 For example, a two-post lift 11 is shown in perspective, which comprises two associated lifting devices 12. This lifting device 12 comprises a lifting column 14, which is firmly connected, for example, with a base plate 16 which is fixedly connected to a substrate. A carrier 17 is along a Hubachse 15 of the lifting device 11 provided movable up and down. The carrier receives a load-receiving means 18. The load-receiving means 18 comprises a housing portion 19, which is at least partially closed, at the respective outer ends of the support arms 21 are pivotally received about a vertical pivot axis 22. These support arms 21 may be formed telescopically and have the pivot axis 22 opposite load-receiving elements 23 and provisions to arrange various load-bearing elements 23 interchangeable thereon.

The carrier 17 further receives a drive device 25. This may be formed electro-hydraulically, hydraulically or mechanically and has according to the illustrated embodiment, a hydraulic unit. This drive device 25 is monitored and controlled by a controller 26. For energy supply, for example, at least one accumulator 27 may be provided. The controller 26 operates advantageously wirelessly. In particular, a remote control may be provided to control the lifting devices 12. In particular, the two mutually associated and opposite lifting devices 12 wirelessly communicate with each other to ensure, for example, a simultaneous initiation of a lifting and lowering movement and a mutual monitoring of synchronization or the like. Alternatively, 12 supply lines and / or control lines may be provided between the two lifting devices, so that both control signals and a power supply are made possible by cable.

The carrier 17 is sleeve-shaped or cartridge-shaped and surrounds the lifting column 14. In this arrangement, it is therefore provided that the drive spindle or the hydraulic cylinder for raising and lowering the carrier 17 is disposed within the lifting column 14. The hydraulic cylinder is supported on the one hand at a lower end of the lifting column 14 and the base plate 16 and engages the upper, inner end portion of the carrier 17. To guide the carrier 17 to the lifting column 14 guide elements 29 are provided in between which may for example be designed as a roller or sliding elements or as a combination thereof. Between the lifting column 14 and the carrier 17 further comprises a fall arrester 32 is provided, by which after the activation of a lifting movement of the carrier 17, a deactivation or a Stromlosschaltung an adhesive magnet of the fall arrest occurs and a locking element makes a backup of the set stroke position.

An alternative embodiment of the lifting device 12 provides that the lifting columns have a U-shaped cross section, within which the carrier is guided movable up and down, wherein the at least partially closed housing portion 19 in analogy to the lifting device 12 according to FIG. 2 is arranged on the carrier 17 to receive the support arms 21.

Another alternative embodiment of the lifting device 11 may be that instead of the lifting column and the carrier movable up and down, a lifting ram of a punching stage is provided, wherein the carrier is arranged at the upper end of the lifting ram on which the support arms 21 are provided.

Furthermore, a further alternative embodiment of the lifting device 11 may be provided, in which the up and down movable carrier by means of a half scissors or double scissors, which in turn are actuated with a hydraulic cylinder, is moved up and down, on which the support arms 21 may be arranged.

In FIG. 2 is a front view of the support 17 with an open housing portion 19 is shown in which a front cover 34 (FIG. FIG. 1 ) is removed from the housing portion 19. In the housing portion 19 of the carrier 17, a locking device 37 is provided which engages the support arm 21. By means of this locking device 37, a set pivot position of the support arm 21 can be fixed, so that the adjusted pivot position of the support arm 21 is maintained at a load point on a vehicle.

The locking device 37 comprises an actuatable adjusting device 38, which is designed according to the embodiment as a hydraulic cylinder 39. This hydraulic cylinder 39 comprises a piston rod 41 whose one outer end engages remote from the pivot axis 22 on the support arm 21. The hydraulic cylinder 39 comprises a bearing pin 43, which engages in a bore 44 of a bearing plate 45, whereby a bearing 42 is provided for the pivotable mounting of the hydraulic cylinder 39. The hydraulic cylinder 39 is held secured to the bearing 42 by a securing element 46. In the exemplary embodiment, this may for example be a socket pin, a screw or the like, which is fastened in an upper part of the housing portion 19 and acts on a housing 40 of the hydraulic cylinder 39 and fixed to the bearing 42.

The adjusting device 38 may alternatively comprise a pneumatically driven or electrically or electromagnetically driven adjusting device and / or a reciprocating piston 39 to the hydraulic cylinder. Alternatively, a linear drive can be provided, which in turn can be driven electrically, pneumatically or hydraulically. An adjusting movement or a movement of the adjusting device 38 can be controlled by a switching valve 54 or a switching contact, whose operation will be described below. Alternatively, the adjusting movement can also be driven only via a control device of the lifting device 12.

In FIG. 3 is a schematic view from above of the lifting device 12 is shown, wherein an upper part of the housing portion 19 is removed to illustrate the arrangement and positioning of the locking device 37 within the housing portion 19. The bearing 42 is formed by the bearing plate 45, which is fixed to both the front cover 34 and to a rear cover 35. The hydraulic cylinder 39 engages with a free end of the piston rod 41 on the support arm 21 remote from the pivot axis 22. Due to the pivotable arrangement of the hydraulic cylinder 39 to the bearing 42, the housing 40 of the Hydraulic cylinder 39 perform a compensating movement or pivotal movement relative to the bearing 42, whereby an unobstructed pivoting of the support arm 21 is made possible within the intended pivoting range.

The bearings 42 for receiving the hydraulic cylinder 39 are spaced so far from each other that the piston rods 41 of the hydraulic cylinder 39 do not interfere with each other.

In FIG. 4 a schematic enlarged sectional view of the locking device 37 is shown. This comprises the at least one hydraulic cylinder 39, which is designed as a double-acting cylinder. This has a piston 47, whose respective chamber 49, 50 facing piston surface is the same size. The chamber 49 and chamber 50 are connected directly to one another by an overflow line 52, wherein a switching valve 54 is provided in the overflow line 52, which releases a flow in the overflow line 52 in one switching position and blocks the overflow line 52 in another switching position. The switching valve 54 further includes a sensing element 55, by which the switching valve 54 is manually controllable according to a first embodiment. Such a locking device 37 allows automatic release and locking of a pivotal position of the support arm 21 to the carrier 17 during lifting and lowering of the carrier 17 of the lifting device 12, as described below with reference to FIG Figures 2 and 5 is described.

Alternatively, both the switching valve 54 or the switching contact in an electrically controlled adjusting device 38 are also controlled wirelessly.

The FIG. 2 shows a schematic side view of a support arm 21 with the locking device 37 in a raised position or during a lifting or lowering phase of the carrier 17 to the lifting column 14th FIG. 5 shows a side view of the support arm 21 and the locking device 37 in a lowered position, that is, that the locking device 37 is unlocked or released.

In the presentation according to FIG. 2 the locking device 37 is in a locked position. The switching valve 54 blocks the transmission line 52, so that a sliding movement of the piston rod 41 due to the double-acting hydraulic cylinder 39 is not possible. Rather, the set pivot position of the support arm 21 to the carrier 17 is maintained. Due to the use of such a hydraulic cylinder 37, any pivotal position of the support arm 21 can be taken to the support 17 and adjusted.

In a lower housing bottom 57 of the housing section 19 (FIG. FIG. 2 ), an opening 58 is provided, through which the probe element 55 protrudes at least slightly relative to an outer side of the housing bottom 57. Associated with this opening 58, a protective cover 61 can be provided which, for example, is designed in strip form as a bending tab. This protective cover 61 is lifted off from the outside of the housing bottom 57 by the feeler element 55, which is arranged in a locked position of the locking device 37. During a downward movement of the carrier 17 in a starting position of the lifting device 12 for loading and unloading a vehicle or loads the protective cover 61 comes to rest on the base plate 16, whereby the sensing element 55 is actuated and the switching valve 54 from a locking or locking position in one Unlocked position is transferred. In this unlocking position, the overflow line 52 is not interrupted, that is, the support arm 21 is freely pivotable and displaced in a piston chamber 49 working fluid is displaced directly into the opposite piston chamber 50 or vice versa. Preferably, an oil or otherwise incompressible medium is provided as the working medium.

Thus, when lowering the carrier 17 with the load receiving device 18, an automatic unlocking of the locking device 37 is made possible.

This automatic locking of the locking device 37 also takes place during a lifting movement or a lifting movement of the carrier 17 to the lifting column 14. After example the support arms 21 are positioned to load receiving points of a vehicle or a load and a lifting movement of the carrier 17 is driven, takes place immediately after lifting the support arm 21 from the lowered position locking the adjusted pivot position of the or the support arms 21. The hub, after this Locking occurs, for example, over the length of the probe element 55 or the switching path of the switching valve 54 is adjustable.

The release and locking of the locking device 37 may alternatively be effected by a sensor or a proximity switch which is provided on the lifting device 12. In this case, on the one hand can be used as a reference point of the underground floor, on which the lifting device 12 is mounted. Alternatively, a reference point can be given within the lifting device 12, that is to say that, for example, in the case of a height measurement or measurement of the lifting movement, a locking or unlocking can be controlled.

Furthermore, alternatively, a pivoting movement of the support arm 21 can be controlled by motor, for example, by a hydraulic pump of the drive means of the hydraulic cylinder 39 is driven via an input and Ausfahrbewegung for adjusting the pivotal position of the support arm 21.

In FIG. 6 an alternative embodiment of a support arm 21 is shown to the above embodiments. This support arm 21 comprises a first support arm portion 66 and a second support arm portion 67, which are pivotally connected to each other via a hinge connection 68. At the outer end of Tragarmabschnittes 67, for example, the load-receiving element 23 is arranged. Alternatively, another support arm section could be arranged on the hinge or be telescopic. Between the first and second support arm portion 66, 67, for example, the locking device 37 engages in an analogous manner, as is provided between the first support arm portion 66 and the carrier 17. Thus, by means of the two locking devices 37, both support arm sections 66, 67 can move relative to the carrier 17 in their position with respect to the load-receiving element 23 Load handling points targeted and flexibly aligned and controlled.

In FIG. 7 a further preferred embodiment of a support arm 21 is shown with a load-receiving element 23 to which an extension 71 of the support arm 21 is attached. The extension 71 has a U-shaped or fork-shaped receiving portion 72 which engages around the load-receiving element 23 on both sides. In a bore shown on the load-receiving element 23 (FIG. FIG. 3 ), a bolt 73 is inserted, for example, from above, whereby the extension 71 is secured to the load-receiving element 23 pivotally. The extension 71 has the bolt 73 opposite a bore 74, in which interchangeable a support member, for example, with a rubber pad, can be used, which is provided for attachment to load receiving points of a vehicle. Due to the extension 71 an adaptation to different sized bodies can be made possible in addition. For safely receiving the extension 71, for example in the in FIG. 7 shown angular arrangement to the support arm 21, the load-receiving element 23 comprises support surfaces 76, which also in FIG. 3 are shown in plan view. These support surfaces 76 form an enlarged support surface for the extension 71 in different angular positions and ensure that no rotation of the extension 71 to the support arm 21 occurs at a load occurring. Such extensions 71 may have different sizes in which the distance between the bore 74 and the bolt 73 varies.

In FIG. 8 the locking device 37 of the carrier 17 of the lifting device 12 is equipped with a handling device 80, which regardless of the position of the load receiving 18 with respect to the lifting height allows manual actuation of the locking device 37 to change the support arms 21 in its pivotal position.

This manual unlocking device 80 comprises an actuating handle 81, which can be arranged, for example, on an upper side of the housing section 19. From this operating handle 18, a cable 82 extends through a first bore 83 in the upper housing portion and through a bore 83 in the housing bottom 57, so that the opposite end preferably removably engages the free deflectable end of the protective cover 61. As a result of this arrangement, when the actuating handle 81 is lifted relative to the housing section 19, the protective cover 61 is positioned against the underside of the housing bottom 57, as a result of which the feeler element 55 transfers the switching valve 54 from a locking position into an unlocking position in order subsequently to pivot the support arm 21. Upon release of the operating handle 81, the protective cover 61 is due to the restoring force of the switching valve 54 or due to the formation of the protective cover 61 in the in FIG. 2 shown initial position, and the set pivot position of the support arm 21 is fixed.

Alternatively, the cable 82 can also act directly on the feeler element 55.

The operating handle 81 may also be positioned at a different location of the lifting device 12, such as in the area of the drive control 25 or the housing of the drive control 35 and on the carrier 17.

Furthermore, by means of an actuating handle 81, the locking devices 37 of the left and right support arm 21 can be unlocked at the same time. For this purpose, a cable guide can be provided, for example, within the carrier 17 by means of deflection rollers.

Claims (15)

1. Lifting device for lifting and lowering vehicles, loads or similar, having a support (17) which is movable up and down, on which a load receiving means (18) is provided, wherein the load receiving means (18) has at least one support arm (21) which is mounted on the support (17) to be pivotable around a pivot axis (22), and having a locking device (37) which fixes the support arm (21) with respect to the support (17) in an adjusted position, wherein the locking device (37) is released in the lowered state of the support (17) and is locked during lifting of the support (17) and secures the adjusted pivot position of the support arm (21) with respect to support (17), characterised in that the locking device (37) comprises at least one operable positioning device (38) which acts to position the support arm (21) with respect to the support (17) in a pivot position, is formed as a hydraulic or pneumatic cylinder having a double-acting cylinder having two equal sized piston surfaces (48) on the piston (47) in the chambers (49, 50) which are connected to each other with an overflow line (42)and that the positioning device (38) is controllable with a switching valve (54) or switching contact is autonomously transferable into a locking position and fixes the adjusted pivot position of the support arm (21).
2. Lifting device according to claim 1, characterised in that the positioning device (38) is formed as a hydraulic, pneumatic, electric or electromagnetic, driven positioning device or as a linear drive.
3. Lifting device according to claim 1, characterised in that the positioning device (38) is formed as a manually operable hydraulic or pneumatic cylinder.
4. Lifting device according to claim 1, characterised in that the pivot position of the support arm (21) is infinitely variable using the positioning device (38).
5. Lifting device according to claim 1, characterised in that a traversing movement of a piston rod (41) in the hydraulic cylinder (39) is controllable by the switching valve (54) arranged in the overflow line (52).
6. Lifting device according to claim 1, characterised in that the switching valve (54) is formed at least as a two-way valve which releases or blocks at least the overflow line (52).
7. Lifting device according to one of the preceding claims, characterised in that the piston rod (41) of the positioning device (39) strikes the support arm (21) at a distance from the pivot axis (22) of the support arm (21).
8. Lifting device according to one of the proceeding claims, characterised in that a housing (40) of the positioning device (38) is arranged to be pivotable on a bearing surface (42) of the support (17) and preferably the housing (40) of the positioning device (38) has a bearing journal (43) which is mounted rotatably in a bore (44) of a bearing plate (45), wherein preferably an operating direction or longitudinal axis of the switching valve (54) or of the switching contact is arranged concentrically to the pivot axis of the bearing journal (43).
9. Lifting device according to claim 1, characterised in that the pivot movement of the support arm (21) is controllable manually or using a drive device (25), preferably using a hydraulic pump or an electric drive.
10. Lifting device according to claim 6, characterised in that the switching valve (54) is mechanically switchable using a push button element (55) or is controllable using an electromagnetically controllable, preferably wirelessly controllable, switching valve (54) or switching contact and preferably the locking device (37) is provided in an at least partially closed housing section (19) of the support (17), which has a housing base (57) having a through bore (58) in which the push button element (55) of the switching valve (54) or of the switching contact is arranged, preferably a protective cover (61) is provided on an outer side of the housing base (57) which covers the perforation (58) of the housing base (57) and is formed preferably as a bending tab.
11. Lifting device according to claim 10, characterised in that, in a locking position of the locking device (37), the push button element (55) protrudes downwards compared to the outer side of the base (57) and a protective cover (61) which covers the push button element (55) is lifted at least partially compared to the outer side of the housing base (57) and preferably the push button element (55) or the protective cover (61) is operable using a hand unlocking device (80), in particular using a wire rope hoist (82).
12. Lifting device according to claim 1, characterised in that two pivotable support arms (21) are arranged on the support (17), the pivot axes (22) of which are preferably each provided adjacent to a lifting axis (15).
13. Lifting device according to claim 1, characterised in that a drive device (25) controllable by a control (26) is provided which comprises at least one control device which is controllable preferably wirelessly.
14. Lifting device according to one of the preceding claims, characterised in that the support (17) is movable up and down along a lifting column (14) or on a lifting stamp of a stamp platform or a half- or double-scissor platform and preferably the support arm (21) has at least two support arm sections (66, 67) which are connected to each other to be pivotable and are positioned with respect to each other in the pivot position using at least one locking device (37).
15. Use of the lifting device according to one of the preceding claims, characterised in that two or more lifting devices (12) allocated to each other in pairs are provided for the formation of a two-column lifting platform or multi-column lifting platform.

Images