Lifting device

Abstract

The invention relates to a lifting device for lifting and lowering a work platform (2) relative to a base support (3), comprising: a base support (3); a work platform (2); at least one first fixed linear guide (4.1) fastened at an acute angle to the base support (3) and at least one second fixed linear guide (4.2) fastened at the same acute angle to the base support (3) in mirror symmetry to the first fixed linear guide (4.1); at least one first movable linear guide (5.1) connected at an opposite acute angle to the work platform (2) and at least one second movable linear guide (5.2) connected at the acute angle to the work platform (2) in mirror symmetry to the first movable linear guide (5.1); and at least one first slider element (6.1) having a first sliding block (6a) which is mounted in longitudinal adjustable guide on the first fixed linear guide (4.1) and a second sliding block (6b) which is mounted in longitudinal adjustable guide on the first movable linear guide (5.1); and at least one second slider element (6.2) having a third sliding block (6c) which is mounted in longitudinal adjustable guide on the second fixed linear guide (4.2) and a fourth sliding block (6d) which is mounted in longitudinal adjustable guide on the second movable linear guide (5.2).

Description

Technical Field

[0001] The present invention relates to a lifting device for raising and lowering a work platform relative to a base support. Background Technology

[0002] Patent document EP1190981A1 describes a scissor lift platform having a lower frame, an upper frame forming a working plane or platform, and a scissor mechanism acting between the lower and upper frames. The scissor mechanism includes intersecting inner and outer scissor members that can be operated to raise and lower the upper frame. At least one pair of intersecting scissor members is equipped with a drive device. One scissor member is equipped with two curved rails, while the other scissor member is equipped with two carriages, slides, etc., that can move towards and away from each other along the curved rails as a drive device.

[0003] Patent document EP2019076A1 describes a scissor lift device having at least two pairs of scissor arms connected by pivot shafts, wherein the pivot shafts are arranged between corresponding end sections of the scissor arms and have actuators for raising and lowering the scissor arms by means of a traction member. The scissor lift device is equipped with two coupling bridges connected by guides and push rods pivotally arranged on the coupling bridges, each push rod being pivotally connected to one scissor arm. At least one coupling bridge carries a steering roller for the traction member, and one coupling bridge is equipped with push rods connected to one scissor arm on the same side of the pivot shaft, while the other coupling bridge is equipped with an expansion body that rests against two arcuate contact rails, each associated with one scissor arm, on the side of the pivot shaft opposite to the push rods. Summary of the Invention

[0004] The object of the present invention is to provide a lifting device for raising and lowering a work platform relative to a base support, the lifting device having a compact structure in the lowered state and being composed of machine components that are as simple as possible, and in particular, inexpensive.

[0005] The object of the present invention is achieved by a lifting device for raising and lowering a work platform relative to a base support, the lifting device comprising: - Basic support structure - Work platform - At least one first fixed linear guide rail fastened to the base support at an acute angle, and at least one second fixed linear guide rail fastened to the base support at the same acute angle in a mirror-symmetric manner with the first fixed linear guide rail. - At least one first liftable linear guide rail connected to the work platform at opposite acute angles, and at least one second liftable linear guide rail connected to the work platform at an acute angle in a mirror-symmetric manner to the first liftable linear guide rail, and - At least one first slider element having a first sliding block and a second sliding block, the first sliding block being longitudinally adjustable and guided on a first fixed linear guide rail, and the second sliding block being longitudinally adjustable and guided on a first liftable linear guide rail, and - At least one second slider element having a third slider and a fourth slider, the third slider being longitudinally adjustable and guided on a second fixed linear guide, and the fourth slider being longitudinally adjustable and guided on a second liftable linear guide.

[0006] The base support can have a base plate, a load-bearing frame, or other supporting components, through which the entire lifting device can be positioned in the desired location. The desired location can be a fixed area, such as the floor of a building or workshop. However, the lifting device may also not be fixedly installed, but rather mounted on a vehicle. For this purpose, the lifting device can be secured to the vehicle's running gear or chassis using the base support. The base support of the lifting device can also be a component of the vehicle if necessary. The vehicle can be, for example, an unmanned transport vehicle, especially an autonomous vehicle. The vehicle can be equipped with omnidirectional wheels, for example, so that the lifting device can not only move on a plane, but also rotate or steer about any point of rotation. In this regard, the base support can also include or constitute fasteners to enable the lifting device to be secured to the vehicle.

[0007] A work platform can constitute a closed-plane workbench or support platform. For example, objects, such as components in a manufacturing and / or assembly environment, can be stored and transported on this work platform. Such objects can be received by raising the work platform. These transported objects can be lowered back down by lowering the work platform. If necessary, a lifting device can also be used to precisely position a raised object relative to another object in its relative height. However, a work platform can also be constructed from a frame or other support structure that requires height adjustment relative to a base support. If necessary, the lifting device can be a component integrated into a larger device or machine, its task being to perform lifting movements. Here, the work platform can form a connector on which a height-adjustable component can be mounted. In this case, the work platform's function is to adjust the height of the connected component.

[0008] At least one first fixed linear guide and a second fixed linear guide are fastened to the base support. In the simplest embodiment, one first fixed linear guide and one second fixed linear guide may be sufficient if necessary. In an improved embodiment, exactly two first fixed linear guides and exactly two second fixed linear guides may be fastened to the base support. In this embodiment, the first pair of first fixed linear guides and second fixed linear guides may be arranged in one side edge region of the lifting device, or in one side edge region of the base support and the work platform, while the second pair of first fixed linear guides and second fixed linear guides may be arranged in the opposite side edge region of the lifting device, or in the opposite side edge region of the base support and the work platform. In another extended embodiment, for example, to withstand very high loads, three or more pairs of first fixed linear guides and second fixed linear guides may be arranged in one side edge region of the lifting device, or in one side edge region of the base support and the work platform.

[0009] Each of the first fixed linear guides is fastened to the base support at an acute angle. This means that the first fixed linear guide extends at an acute angle with respect to the horizontal plane of the base support, and this longitudinal extension defines the adjustment direction of the first slider element, which is adjustablely mounted on the first fixed linear guide. Here, each of the first fixed linear guides is rigidly fastened to the base support. That is, the first fixed linear guide cannot move, rotate, or pivot relative to the base support.

[0010] Similarly, each of the second fixed linear guides is fastened to the base support at an acute angle. This means that the second fixed linear guide extends at an acute angle with respect to the horizontal plane of the base support, and this longitudinal extension defines the adjustment direction for the second slider element, which is adjustablely mounted on the second fixed linear guide. Here, each of the second fixed linear guides is rigidly fastened to the base support. That is, the second fixed linear guide cannot move, rotate, or pivot relative to the base support.

[0011] The size of the acute angle can be freely chosen in principle. Specifically, it can be within the range of 5 to 45 degrees. Here, the size of the acute angle determines the proportional relationship between the linear movement length of each slider element along the fixed linear guide and the lifting height performed by the work platform when adjusting the slider element. Here, the ratio of the linear movement length of each slider element along the fixed linear guide to the lifting height performed by the work platform when adjusting the slider element is linear throughout the entire adjustment stroke. This is a particular advantage of the lifting device according to the invention compared to known scissor lift embodiments. In common scissor lifts, the angle of attack of the scissor varies continuously depending on the configuration, where at a lower initial position, the scissor is in a very flat angular position, and the scissor must be moved out of this angular position to occupy a larger angular position. This results in a sharply increased driving force in the drive of the scissor lift for automatically driving the scissor to raise the scissor platform, i.e., the work platform. Therefore, in known scissor lifts, the drive must also be designed to be relatively powerful in order to be able to move the scissor even from a lower initial position. Therefore, hydraulic drives are usually installed there; however, the disadvantage is that they require expensive additional equipment and are relatively large in size, so the overall structural dimensions of the lifting device cannot be particularly flat.

[0012] However, the lifting device according to the invention is based on a different lifting principle, in which the lifting speed and lifting force are linearly related. Therefore, even at the lower position of the working platform, especially at the lowest position, the driving force is constant while the lifting speed remains constant. Consequently, a less powerful drive can be used, resulting in a lower cost and smaller structural size. The result is a lifting device with a particularly low structural height at a lower initial position.

[0013] The acute angles of the first and second fixed linear guides are always arranged in opposite directions. This means, for example, that the first fixed linear guide extends obliquely upward from the edge region of the base support toward the center of the lifting device, while the second fixed linear guide extends obliquely upward from the opposite edge region of the base support toward the center of the lifting device. Therefore, the first fixed linear guide rises toward the second fixed linear guide. Here, the longitudinal extensions of the first and second fixed linear guides are preferably located in the same vertical plane. Accordingly, the second fixed linear guide is arranged in a mirror-symmetric manner relative to the first fixed linear guide.

[0014] In a modified embodiment, a first fixed linear guide rail extends obliquely upwards from the middle region of the lifting device toward the edge region of the base support, and a second fixed linear guide rail extends obliquely upwards from the same middle region of the lifting device toward the opposite edge region of the base support. Thus, the first fixed linear guide rail rises away from the second fixed linear guide rail. Here, the longitudinal extensions of both the first and second fixed linear guide rails are preferably located in the same vertical plane. In this case, the second fixed linear guide rail is also arranged in a mirror-symmetrical manner relative to the first fixed linear guide rail.

[0015] The first and second liftable linear guides are connected to the work platform. The first liftable linear guide is arranged at an acute angle opposite to that of the first fixed linear guide. Similarly, the second liftable linear guide is arranged at an acute angle opposite to that of the second fixed linear guide.

[0016] The first slider element includes a first sliding block and a second sliding block. The first sliding block and the second sliding block are connected to each other through the first slider element.

[0017] The second slider element includes a third slider block and a fourth slider block. The third slider block and the fourth slider block are interconnected through the second slider element.

[0018] In one embodiment variation, the first and second liftable linear guides are also rigidly connected to the work platform, and the first and second sliding blocks can also be rigidly connected to each other. If necessary, the first and second sliding blocks can be manufactured as a single-piece first slider element. Similarly, the third and fourth sliding blocks can also be rigidly connected to each other. If necessary, the third and fourth sliding blocks can also be manufactured as a single-piece second slider element.

[0019] The lifting motion of the first and second liftable linear guides originates from the rigid connection between their respective liftable linear guides and the work platform, and thus rises or falls together with the work platform, or originates from at least the end sections of each liftable linear guide that are coupled to the work platform, rising or falling together with the work platform.

[0020] To raise and lower the work platform relative to the base support, the at least one first slider element and the at least one second slider element are adjusted relative to each other in a horizontal plane. In this regard, the horizontal plane extends parallel to the plane of the work platform or parallel to the plane of the base support.

[0021] If the first fixed linear guide rail extends obliquely upward from the edge region of the base support toward the center of the lifting device, and the second fixed linear guide rail also extends obliquely upward from the opposite edge region of the base support toward the center of the lifting device, then the lifting of the work platform relative to the base support is achieved by moving the first and second slider elements toward each other. Correspondingly, the lowering of the work platform relative to the base support is achieved by moving the first and second slider elements away from each other.

[0022] If the first fixed linear guide rail extends obliquely upward from the middle region of the lifting device toward the edge region of the base support, and the second fixed linear guide rail extends obliquely upward from the middle region of the same lifting device toward the opposite edge region of the base support, then the lifting of the work platform relative to the base support is achieved by moving the first and second slider elements away from each other. Correspondingly, the lowering of the work platform relative to the base support is achieved by moving the first and second slider elements toward each other.

[0023] The relative movement of the first and second slider elements, both towards and away from each other, can be automatically achieved by at least one drive mechanism. In principle, an electric drive, a hydraulic drive, or a pneumatic drive can be selectively used for this purpose. An electric drive is particularly suitable for achieving a very compact structure with as few drive components as possible.

[0024] The selected drive unit may have a corresponding motor that generates driving torque. The drive unit can include a variety of articulated couplings and / or transmission types to convert the driving torque provided by the motor into a couple that causes the first and second slider elements to move in opposite directions, respectively. Therefore, the drive unit may include a spindle driven by the motor's driving torque, transmitting a corresponding linear axial force to the first and second slider elements. However, the drive unit may also include ropes, chains, or belts that convert the motor's driving torque into corresponding linear motion of the first and second slider elements.

[0025] The first fixed linear guide, the second fixed linear guide, the first liftable linear guide, and / or the second liftable linear guide can each be composed of a corresponding profile guide, which has an external guide surface. The corresponding first sliding block, second sliding block, third sliding block, and / or fourth sliding block can be formed by a guide slide that runs on the corresponding profile guide, which has a built-in mating guide surface.

[0026] Each profile guide rail can be, for example, a T-shaped guide rail or a guide rail of other designs, such as having a C-shaped or circular profile. The corresponding profile guide rail can be constructed as a single rail, or, for example, as a double rail with two profile bodies. Sliding films can be respectively provided between each profile guide rail and its corresponding first, second, third, and / or fourth sliding blocks to minimize friction between the sliding pairs.

[0027] Alternatively, the first fixed linear guide, the second fixed linear guide, the first liftable linear guide, and / or the second liftable linear guide can each be composed of a corresponding profile groove guide, which has a built-in guide surface; while the corresponding first sliding block, second sliding block, third sliding block, and / or fourth sliding block can each be formed by a slot wedge (Nutenstein) running in each profile groove guide, which has an external mating guide surface.

[0028] Here, each profile guide rail can also be, for example, a T-slot guide rail or other designed slot guide rails, such as having a C-shaped or circular profile. Each profile slot guide rail can be constructed as a single rail, or for example, as a double rail having two profile bodies. Sliding films can be respectively provided between each profile slot guide rail and its corresponding first sliding block, second sliding block, third sliding block and / or fourth sliding block, so as to keep the friction between the sliding pairs as small as possible.

[0029] The acute angles between the base support and the first fixed linear guide, the base support and the second fixed linear guide, the working platform and the first liftable linear guide, and the working platform and the second lifting linear guide can be between 5 degrees and 40 degrees, especially between 10 degrees and 20 degrees.

[0030] In the embodiment where the first and second liftable linear guides are rigidly fastened to the work platform, not only are the acute angles of the fixed linear guides constant, but the acute angles of the liftable linear guides are also always constant.

[0031] In an embodiment where the first and second liftable linear guides are pivotally mounted on the work platform, only the acute angle of the fixed linear guide is constant. In this embodiment, the liftable linear guides pivotally mounted on the work platform can also have an angle greater than 40 degrees.

[0032] The lifting device may have at least one drive unit designed to automatically adjust at least one first slider element and at least one second slider element relative to each other.

[0033] The relative movement of the first and second slider elements, both towards and away from each other, can be automatically achieved by at least one drive mechanism. In principle, an electric drive, a hydraulic drive, or a pneumatic drive can be selectively used for this purpose. An electric drive is particularly suitable for achieving a very compact structure with as few drive components as possible.

[0034] The selected drive unit may have a corresponding motor that generates driving torque. The drive unit can include a variety of articulated couplings and / or transmission types to convert the driving torque provided by the motor into a couple that causes the first and second slider elements to move in opposite directions, respectively. Therefore, the drive unit may include a spindle driven by the motor's driving torque, transmitting a corresponding linear axial force to the first and second slider elements. However, the drive unit may also include ropes, chains, or belts that convert the motor's driving torque into corresponding linear motion of the first and second slider elements.

[0035] The at least one drive device may be designed to cause the at least one first slider element and the at least one second slider element to adjust synchronously in opposite directions.

[0036] To ensure that the work platform maintains its horizontal orientation during raising and / or lowering without tilting in an undesirable manner, and / or to ensure that the motion mechanism (Kinematik) does not skew or jam, the movements of the first and second slider elements can be coupled. This coupling can be achieved mechanically, for example, through corresponding coupling joints or through a transmission mechanism.

[0037] If the first slider element moves by its own first driver and the second slider element moves by its own second driver, then these two drivers, for example in the case of an electric driver, can also be coupled by control technology.

[0038] The drive unit may include a motor and a spindle driven by the motor, which adjustably couples the first slider elements relative to each other to the second slider element.

[0039] This motor-spindle unit may, for example, include an electric motor. In one specific embodiment, the spindle may be designed as an extension of the motor shaft. This means that the spindle will not shift relative to the motor housing in its axial direction. In this embodiment, the spindle may, for example, carry a lead screw nut, which can be linearly adjusted in the axial direction relative to the spindle by rotational movement of the motor-driven spindle. For example, the lead screw nut may be connected to or constructed as a single piece with a first slider element, while the motor housing may be connected to a second slider element.

[0040] In an alternative specific implementation variation, the spindle can be axially adjustable and mounted inside the motor housing. This means that when the motor shaft (which is designed to be hollow, in which the spindle operates) rotates, the spindle is adjusted axially relative to the motor housing. In this case, one end of the spindle can be rotatably coupled to a first slider element, for example, while the motor housing can be connected to a second slider element.

[0041] The first liftable linear guide rail can be fastened to the work platform at a fixed acute angle, and the second liftable linear guide rail can be fastened to the work platform mirror-symmetrically with the first liftable linear guide rail at the same fixed acute angle, wherein the first sliding block and the second sliding block are rigidly connected to each other to form the first slider element, and the third sliding block and the fourth sliding block are rigidly connected to each other to form the second slider element.

[0042] Not only the rigid connection between the first and second fixed linear guides, but also the rigid connection between the first and second adjustable linear guides ensures the precise parallel orientation of the work platform relative to the base support. If the base support is set on a horizontal plane, it also ensures that the work platform is always precisely horizontal at each adjustable lifting height.

[0043] At least one first drive device may be integrated into a first fixed linear guide rail and / or a first liftable linear guide rail, and is designed to drive and adjust a first slider element; and at least one second drive device may be integrated into a second fixed linear guide rail and / or a second liftable linear guide rail, and is designed to drive and adjust a second slider element.

[0044] In this implementation, the first and second drive units can be linear drives. Each linear drive can be an electric linear drive. Each linear drive can be driven by a spindle, belt, toothed belt, or rack. The required motor can be an electric motor.

[0045] The at least one first linear driver and at least one second linear driver may be coupled in a controlled manner, for example, in the case of an electric driver, such that the lifting motion on the first fixed linear guide and the first liftable linear guide can be matched with the lifting motion on the second fixed linear guide and the second liftable linear guide, i.e., synchronized.

[0046] The first liftable linear guide rail can be pivotally mounted on the work platform at an acute angle, and the second liftable linear guide rail can be pivotally mounted on the work platform at an acute angle, mirror-symmetric to the first liftable linear guide rail; and / or, in order to form the first slider element, the first sliding block and the second sliding block are rotatably hinged to each other, and in order to form the second slider element, the third sliding block and the fourth sliding block are rotatably hinged to each other.

[0047] In this particular extension of the invention, the work platform can be tilted in a targeted manner by adjusting the first and second slider elements differently. Nevertheless, the raising and lowering of the work platform in a purely horizontal orientation can still be performed through the synchronized movement of the first and second slider elements. Attached Figure Description

[0048] Specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Specific features of these exemplary embodiments may be considered individually or in combination as general features of the invention, regardless of where they are specifically mentioned herein. Wherein: Figure 1 A perspective view of a basic embodiment of the lifting device according to the present invention is shown; Figure 2 A first embodiment of the lifting device is shown, which has a fixed linear guide rail that is rigidly fastened and a liftable linear guide rail, in a raised configuration. Figure 3 It shows that according to Figure 2 The first embodiment of the lifting device has a fixed linear guide rail that is rigidly fastened and a liftable linear guide rail, which is in a lowered configuration. Figure 4 A second embodiment of the lifting device is shown, comprising a fixed linear guide rail rigidly fastened thereto and a movable linear guide rail movably mounted on a work platform, in an inclined upward configuration; and Figure 5 It shows that according to Figure 4 A second embodiment of the lifting device has a fixed linear guide rail that is rigidly fastened and a movable linear guide rail that is movably mounted on the work platform, and is in a lowered configuration. Detailed Implementation

[0049] exist Figures 1 to 5 Different embodiments of the lifting device 1 are shown in the figure.

[0050] Each lifting device 1 is used to raise and lower the work platform 2 relative to the base support 3, thereby achieving a compact structure in the lowered state, and the lifting device 1 is composed of the simplest possible mechanical components.

[0051] Figure 1 A lifting device 1 is shown for raising and lowering a work platform 2 relative to a base support 3. The lifting device 1 has a base support 3 and a work platform 2.

[0052] The lifting device 1 includes at least one first fixed linear guide rail 4.1 fastened to the base support 3 at an acute angle and at least one second fixed linear guide rail 4.2 fastened to the base support 3 at the same acute angle as the first fixed linear guide rail 4.1.

[0053] In this embodiment, the lifting device 1 has exactly two first fixed linear guides 4.1 and exactly two second fixed linear guides 4.2. In this implementation, the first pair of first fixed linear guides 4.1 and second fixed linear guides 4.2 can be arranged in a lateral edge region of the lifting device 2, or in a lateral edge region of the base support 3 and the work platform 2, and the second pair of second fixed linear guides 4.1 and second fixed linear guides 4.2 can be arranged in the opposite lateral edge region of the lifting device 1, or in the opposite lateral edge region of the base support 3 and the work platform 2.

[0054] The lifting device 1 also includes at least one first liftable linear guide rail 5.1 connected to the work platform 2 at opposite acute angles and at least one second liftable linear guide rail 5.2 connected to the work platform 2 at an acute angle in a mirror-symmetric manner to the first liftable linear guide rail 5.1.

[0055] In this embodiment, the lifting device 1 has exactly two first liftable linear guides 5.1 and exactly two second liftable linear guides 5.2. In this implementation, the first pair of first liftable linear guides 5.1 and second liftable linear guides 5.2 can be arranged in a lateral edge region of the lifting device 2, or in a lateral edge region of the base support 3 and the work platform 2, and the second pair of first liftable linear guides 5.1 and second liftable linear guides 5.2 can be arranged in the opposite lateral edge region of the lifting device 1, or in the opposite lateral edge region of the base support 3 and the work platform 2.

[0056] The lifting device 1 also includes at least one first slider element 6.1, which has a first sliding block 6a and a second sliding block 6b, wherein the first sliding block is longitudinally adjustable and guided on a first fixed linear guide rail 4.1, and the second sliding block is longitudinally adjustable and guided on a first liftable linear guide rail 5.1.

[0057] The lifting device 1 also includes at least one second slider element 6.2, which has a third sliding block 6c and a fourth sliding block 6d, wherein the third sliding block is longitudinally adjustable and guided on a second fixed linear guide rail 4.2, and the fourth sliding block is longitudinally adjustable and guided on a second liftable linear guide rail 5.2.

[0058] In this embodiment, the first fixed linear guide 4.1, the second fixed linear guide 4.2, the first liftable linear guide 5.1, and the second liftable linear guide 5.2 are formed from corresponding profile guides, which have external guide surfaces. The corresponding first sliding block 6a, second sliding block 6b, third sliding block 6c, and fourth sliding block 6d are formed from guide slides running on their respective profile guides, and the guide slides have built-in mating guide surfaces.

[0059] However, the arrangement of each guide rail can also be reversed.

[0060] Therefore, the first fixed linear guide 4.1, the second fixed linear guide 4.2, the first liftable linear guide 5.1, and the second liftable linear guide 5.2 can be composed of corresponding profile groove guides. The profile groove guides have built-in guide surfaces, wherein the corresponding first sliding block 6a, second sliding block 6b, third sliding block 6c, and fourth sliding block 6d are formed by groove wedges running in their respective profile groove guides, and the groove wedges have external mating guide surfaces.

[0061] The acute angles between the base support 3 and the first fixed linear guide 4.1, between the base support 3 and the second fixed linear guide 4.2, between the work platform 2 and the first liftable linear guide 5.1, and between the work platform 2 and the second liftable linear guide 5.2 can each be between 5 degrees and 40 degrees, particularly between 10 degrees and 20 degrees. In the illustrated embodiment, each acute angle is approximately 13 degrees.

[0062] The size of the acute angle determines the proportional relationship between the linear movement length of each slider element 6.1, 6.2 along the fixed linear guide rails 4.1, 4.2 and the lifting height performed by the working platform 2 when adjusting the slider elements 6.1, 6.2. Here, the ratio of the linear movement length of each slider element 6.1, 6.2 along the fixed linear guide rails 4.1, 4.2 to the lifting height performed by the working platform 2 when adjusting the slider elements 6.1, 6.2 is linear over the entire adjustment stroke. This is a particular advantage of the lifting device 1 according to the present invention compared to known scissor lift embodiments.

[0063] The lifting device 1 according to the invention is based on a different lifting principle in which the lifting speed and lifting force are linearly related. Therefore, even at the lower position of the working platform 2, especially at the lowest position of the working platform 2, the driving force is constant while the lifting speed remains constant. Thus, a less powerful drive can be used, resulting in a lower cost and smaller structural size. As a result, a lifting device 1 with a particularly low structural height can be provided at a lower initial position.

[0064] The lifting device 1 has at least one drive device 7, which is designed to automatically adjust at least one first slider element 6.1 and at least one second slider element 6.2 relative to each other.

[0065] At least one drive device 7 may be designed to synchronously adjust at least one first slider element 6.1 and at least one second slider element 6.2 in opposite directions.

[0066] In the illustrated embodiment, the drive device 7 includes a motor 8 and a spindle 9 driven by the motor 8, the spindle adjustingly coupling a first slider element 6.1 and a second slider element 6.2 relative to each other.

[0067] According to Figure 2 and Figure 3 In this embodiment, the first liftable linear guide 5.1 is fastened to the work platform 2 at a fixed acute angle, and the second liftable linear guide 5.2 is fastened to the work platform 2 mirror-symmetrically with the first liftable linear guide 5.1 at the same fixed acute angle. The first sliding block 6a and the second sliding block 6b are rigidly connected to each other to form the first slider element 6.1, and the third sliding block 6c and the fourth sliding block 6d are rigidly connected to each other to form the second slider element 6.1.

[0068] Replacement Figure 2 The single independent drive device 7 shown may include at least one first drive device 7.1, which may be integrated into the first fixed linear guide 4.1 and / or the first liftable linear guide 5.1, and is designed to drive the adjustment of the first slider element 6.1, or the first sliding block 6a and / or the second sliding block 6b; and at least one second drive device 7.2 may be integrated into the second fixed linear guide 4.2 and / or the second liftable linear guide 5.2, and is designed to drive the adjustment of the second slider element 6.2.

[0069] This independent first drive unit 7.1 and second drive unit 7.2 in Figure 4 and Figure 5 The variant implementation shown may be useful.

[0070] Here, the first liftable linear guide 5.1 can be pivotally mounted on the work platform 2 at an acute angle via the first rotary bearing 10.1, and the second liftable linear guide 5.2 can be pivotally mounted on the work platform 2 at an acute angle mirror-symmetric to the first liftable linear guide 5.1 via the second rotary bearing 10.2.

Claims

1. A lifting device for raising and lowering a work platform (2) relative to a base support (3), comprising: - Basic support (3). - Work platform (2), - At least one first fixed linear guide (4.1) fastened to the base support (3) at an acute angle and at least one second fixed linear guide (4.2) fastened to the base support (3) at the same acute angle as the first fixed linear guide (4.1). - At least one first liftable linear guide rail (5.1) connected to the work platform (2) at opposite acute angles and at least one second liftable linear guide rail (5.2) connected to the work platform (2) at the acute angles mirror-symmetric to the first liftable linear guide rail (5.1), and - At least one first slider element (6.1) having a first sliding block (6a) and a second sliding block (6b), the first sliding block being longitudinally adjustable and guided on the first fixed linear guide rail (4.1), and the second sliding block being longitudinally adjustable and guided on the first liftable linear guide rail (5.1), and - At least one second slider element (6.2) having a third slider (6c) and a fourth slider (6d), the third slider being longitudinally adjustable and guided on the second fixed linear guide (4.2), and the fourth slider being longitudinally adjustable and guided on the second liftable linear guide (5.2).

2. The lifting device according to claim 1, characterized in that, The first fixed linear guide (4.1), the second fixed linear guide (4.2), the first liftable linear guide (5.1) and / or the second liftable linear guide (5.2) are composed of corresponding profile guides. The profile guides have external guide surfaces, and the corresponding first sliding block (6a), second sliding block (6b), third sliding block (6c) and / or fourth sliding block (6d) are respectively composed of guide slides running on the corresponding profile guides. The guide slides have built-in mating guide surfaces.

3. The lifting device according to claim 1, characterized in that, The first fixed linear guide (4.1), the second fixed linear guide (4.2), the first liftable linear guide (5.1) and / or the second liftable linear guide (5.2) are composed of corresponding profile groove guides. The profile groove guides have built-in guide surfaces, and the corresponding first sliding block (6a), second sliding block (6b), third sliding block (6c) and / or fourth sliding block (6d) are formed by groove wedges running in the corresponding profile groove guides. The groove wedges have external mating guide surfaces.

4. The lifting device according to any one of claims 1 to 3, characterized in that, The acute angles between the base support (3) and the first fixed linear guide (4.1), the acute angles between the base support (3) and the second fixed linear guide (4.2), the acute angles between the working platform (2) and the first liftable linear guide (5.1), and the acute angles between the working platform (2) and the second liftable linear guide (5.2) are all between 5 degrees and 40 degrees, especially between 10 degrees and 20 degrees.

5. The lifting device according to any one of claims 1 to 4, characterized in that, The lifting device (1) has at least one drive device (7) designed to automatically adjust the at least one first slider element (6.1) and the at least one second slider element (6.2) relative to each other.

6. The lifting device according to claim 5, characterized in that, The at least one drive device (7) is designed to synchronize the at least one first slider element (6.1) and the at least one second slider element (6.2) in opposite directions.

7. The lifting device according to any one of claims 5 to 7, characterized in that, The drive device (7) includes a motor (8) and a spindle (9) driven by the motor (8), the spindle adjustingly coupling the first slider element (6.1) and the second slider element (6.2) relative to each other.

8. The lifting device according to any one of claims 1 to 7, characterized in that, The first liftable linear guide (5.1) is fastened to the work platform (2) at a fixed acute angle, and the second liftable linear guide (5.2) is fastened to the work platform (2) mirror-symmetrically with the first liftable linear guide (5.1) at the same fixed acute angle. The first sliding block (6a) and the second sliding block (6b) are rigidly connected to each other to form the first slider element (6.1), and the third sliding block (6c) and the fourth sliding block (6d) are rigidly connected to each other to form the second slider element (6.2).

9. The lifting device according to any one of claims 1 to 8, characterized in that, At least one first drive device (7.1) is integrated in the first fixed linear guide (4.1) and / or in the first liftable linear guide (5.1) and is designed to drive the adjustment of the first slider element (6.1); and at least one second drive device (7.2) is integrated in the second fixed linear guide (4.2) and / or in the second liftable linear guide (5.2) and is designed to drive the adjustment of the second slider element (6.2).

10. The lifting device according to claim 9, characterized in that, The first liftable linear guide (5.1) is pivotally mounted at an acute angle on the work platform (2), and the second liftable linear guide (5.2) is pivotally mounted at an acute angle on the work platform (2) in a mirror-symmetric manner with the first liftable linear guide 5.1 (5.1); and / or, in order to form the first slider element (6.1), the first sliding block (6a) and the second sliding block (6b) are rotatably hinged to each other, and in order to form the second slider element (6.2), the third sliding block (6c) and the fourth sliding block (6d) are rotatably hinged to each other.

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