Three-stage lifting device

Abstract

Three-stage lifting device, characterized in that it comprises: a gas spring, a release element, an inner tube, a middle tube and an outer tube; wherein the middle tube is arranged on the outside of the inner tube, the outer tube is arranged on the outside of the middle tube, and the inner tube is connected to the middle tube and the outer tube respectively via a synchronization assembly; wherein a first connecting plate is provided on the middle tube and a second connecting plate is provided on the outer tube, the cylinder tube of the gas spring is attached to the first connecting plate and the telescopic rod of the gas spring is guided through the first connecting plate and connected to the second connecting plate;wherein the release element is movably attached to the second connecting plate and the release element is arranged opposite the release pin arranged on the telescopic rod, wherein the release element is designed to displace the release pin when actuated.

Description

Technical field The present application relates to the technical field of lifting columns, in particular a three-stage lifting device. State of the art With the rapid development of smart home applications, medical care, and RV conversions, lifting stands are becoming widely used in height-adjustable tables, chairs, and hospital beds. Users can adjust the device to a suitable height according to their needs, improving comfort and ease of use. Currently, conventional lifting stands are driven by electric motors. Their structure comprises multi-stage, nested sleeves, an electric motor, a reduction gear, and a spindle drive. The electric motor is mounted in the innermost or outermost sleeve. The output shaft of the electric motor is connected to the spindle via the reduction gear, and the spindle interacts with a nut. When the electric motor rotates under power, the spindle moves the nut along the axial direction, thereby extending or retracting the multi-stage sleeves sequentially, thus achieving height adjustment. However, the electric motor drive requires the equipment to include an electric motor, reduction gearbox, spindle, control unit and wiring harness, which not only results in a large number of components and a complex structure, but also, since these transmission and control components all have to be integrated into the limited space of the sleeve, the overall volume of the sleeve is relatively large, making it difficult to implement applications with strict space requirements, such as ultra-flat furniture or confined conversion spaces, and limiting the flexibility of use. Content of the utility model To solve the aforementioned technical problems, the present application provides a three-stage lifting device which reduces the overall volume and increases the flexibility of use. The technical solution provided in the present application is described below: The present application provides a three-stage lifting device comprising: a gas spring, a release element, an inner tube, a middle tube, and an outer tube; wherein the middle tube is arranged externally on the inner tube, the outer tube is arranged externally on the middle tube, and the inner tube is connected to the middle tube and the outer tube, respectively, via a synchronization assembly; wherein a first connecting plate is provided on the middle tube and a second connecting plate is provided on the outer tube, the cylinder tube of the gas spring is attached to the first connecting plate, and the telescopic rod of the gas spring passes through the first connecting plate and is connected to the second connecting plate;wherein the release element is movably attached to the second connecting plate and the release element is arranged opposite the release pin arranged on the telescopic rod, wherein the release element is designed to displace the release pin when actuated. In an optional embodiment, a mounting tube is provided on the first connecting plate, with the cylinder tube of the gas spring being arranged inside the mounting tube. In an optional embodiment, the synchronization assembly comprises a first connecting cable, a second connecting cable, a first pulley, a second pulley, and a connecting element; wherein the first pulley is arranged at an end of the mounting tube facing away from the first connecting plate, the connecting element is arranged on an inner wall of the inner tube, one end of the first connecting cable is connected to the connecting element, and the other end of the first connecting cable, after being deflected around the first pulley, is connected to the second connecting plate; wherein the second pulley is arranged on the first connecting plate, one end of the second connecting cable is attached to the upper end of the inner tube, and the other end of the second connecting cable, after being deflected around the second pulley, is connected to the stop plate arranged on the outer tube. In an optional design, the stop plate is attached to an end of the outer tube facing away from the second connecting plate. In an optional design, a third connecting plate is provided at the upper end of the inner tube, with the second connecting cable being attached to the third connecting plate. In an optional embodiment, a fixing sleeve is provided at one end of the mounting tube facing away from the first connecting plate, with the first roller being attached to the fixing sleeve. In an optional embodiment, the release element comprises a release lever and a pedal, wherein a mounting block is provided on the second connecting plate, the release lever is movably attached to the mounting block, one end of the release lever rests against the release pin and the pedal is attached to the other end. In an optional embodiment, the three-stage lifting device further comprises sliding linings, wherein the sliding linings are arranged in the gap between the inner tube and the middle tube as well as in the gap between the middle tube and the outer tube. In an optional configuration, the first connecting rope or the second connecting rope is designed as a wire rope, UHMW-PE rope, polyarylate fiber rope or polyimide rope. In an optional design, the mounting tube and the first connecting plate are connected to each other by a screw connection. From the foregoing technical solutions, it is evident that the present application has the following advantageous effects: By arranging a gas spring within the structure of the three-stage telescopic tubes (outer tube, middle tube and inner tube), wherein the cylinder tube of the gas spring is attached to the first connecting plate arranged on the middle tube and the telescopic rod of the gas spring is passed through the first connecting plate and is connected to the second connecting plate of the outer tube, and by arranging a release element on the second connecting plate, which is arranged opposite the release pin of the telescopic rod, a lifting movement between the outer tube and the middle tube can be achieved by the interaction of the release element with the gas spring;Since the inner tube is connected to both the middle and outer tubes via the synchronization assembly, during a lifting movement between the outer and middle tubes, the inner tube is coupled to a synchronous lifting movement. Compared to a conventional electric motor drive, the present application uses a gas spring drive, which reduces the number of components within the three-stage telescopic tubes, simplifies the structure, reduces the overall volume of the three-stage telescopic tubes, and increases the flexibility of use. Description of the drawings Fig. 1: Schematic sectional view of a three-stage lifting device according to the present application; Fig. 2: Schematic representation of a three-stage lifting device according to the present application; Fig. 3: Further schematic representation of a three-stage lifting device according to the present application; Fig. 4: Schematic representation of a three-stage lifting device according to the present application; Fig. 5: Further schematic representation of a three-stage lifting device according to the present application; Fig. 6: Schematic representation of a three-stage lifting device according to the present application; Fig.7 : Schematic representation of a three-stage lifting device according to the present application; in the drawings, the following are designated: gas spring 01, release element 02, inner tube 03, middle tube 04, outer tube 05, first connecting plate 06, second connecting plate 07, cylinder tube 08, telescopic rod 09, release pin 10, mounting tube 11, first connecting cable 12, second connecting cable 13, first roller 14, second roller 15, connecting element 16, stop plate 17, third connecting plate 18, fixing sleeve 19, mounting block 20, sliding surface 21. Examples of implementation In the present application, the terms “top”, “bottom”, “left”, “right”, “front”, “back”, “tip”, “bottom”, “inside”, “outside”, “middle”, “vertical”, “horizontal”, “transverse” and “longitudinal” denote positional relationships based on the positional relationships shown in the drawings and serve only to describe relative positional relationships between individual parts or components, without specifically restricting the concrete installation position of the parts or components. Furthermore, the aforementioned terms can have other meanings besides indicating location or positional relationships. For example, the term "above" can, in certain cases, also denote an assignment or connection relationship. For a person skilled in the art, the specific meanings of these terms in the present application are understandable according to the respective circumstances. Furthermore, the terms "assembly," "arrangement," "provision," "connection," and "being connected" are to be interpreted broadly. For example, they may refer to a permanent connection, a detachable connection, or a one-piece assembly; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection via an intermediate medium, or to an internal connection between two devices, elements, or components. The specific meanings of the foregoing terms in this application are understandable to the person skilled in the art, depending on the circumstances. Furthermore, the structures, proportions and sizes shown in the drawings of the present application serve only to illustrate the content disclosed in the description, to facilitate understanding and reading by the person skilled in the art, and do not constitute a limitation of the implementable conditions of the present application, so that they are not of technical significance; any changes to structures, proportions or sizes, provided that they do not affect the effects and purposes achievable by the present application, remain within the scope of protection of the technical content disclosed in the present application. The technical solution of the present application is described clearly and completely below with reference to the drawings of the present application; obviously, the described embodiments represent only a part of the embodiments of the present application and not all embodiments. All further embodiments that a person skilled in the art obtains on the basis of the embodiments of the present application without inventive step fall within the scope of the technical content disclosed in the present application. In view of the problems inherent in conventional electric motor-driven lifting stands, namely the need for a large number of individual components, the complexity of the structure resulting in a large overall volume and low flexibility of use, the present application proposes a three-stage lifting device which serves to reduce the overall volume and increase the flexibility of use;The present application uses a gas spring as a drive source, enabling the sequential extension and retraction of a three-stage telescopic tube, and is suitable for applications such as height-adjustable tables, height-adjustable chairs, medical equipment, and motorhome-integrated furniture where a large stroke for height adjustment is required. The specific structure of the present application is described below: With reference to Figures 1, 2, 3, 4, 5, 6 to 7, the present application provides an embodiment of a three-stage lifting device, comprising: a gas spring 01, a release element 02, an inner tube 03, a middle tube 04, and an outer tube 05;wherein the central tube 04 is arranged externally on the inner tube 03, the outer tube 05 is arranged externally on the central tube 04, and the inner tube 03 is connected to the central tube 04 and the outer tube 05 respectively via a synchronization assembly; wherein a first connecting plate 06 is provided on the central tube 04 and a second connecting plate 07 is provided on the outer tube 05, the cylinder tube 08 of the gas spring 01 is attached to the first connecting plate 06, and the telescopic rod 09 of the gas spring 01 is guided through the first connecting plate 06 and is connected to the second connecting plate 07; wherein the release element 02 is movably attached to the second connecting plate 07, and the release element 02 is arranged opposite the release pin 10 arranged on the telescopic rod 09, wherein the release element 02 is controllable to actuate the release pin 10. The inner tube 03, the middle tube 04, and the outer tube 05 are each sleeves with open ends, their inner diameter increasing in steps. The middle tube 04 is slidably mounted on the inner tube 03, and the outer tube 05 is slidably mounted on the middle tube 04. The inner tube 03, the middle tube 04, and the outer tube 05 are arranged coaxially and can move relatively telescopically in the axial direction. The inner tube 03 is connected to the middle tube 04 and the outer tube 05 via the synchronization assembly to achieve a three-stage coupling. The specific structure of the synchronization assembly is described in detail in the following embodiments. The gas spring 01 is designed as a lockable gas spring 01 (self-locking gas spring 01) and comprises a cylinder tube 08, a telescopic rod 09 and a release pin 10 arranged at the end section of the telescopic rod 09. The release pin 10 serves to control the opening and closing of the internal valve of the gas spring 01. With regard to the outer tube 05, a second connecting plate 07 is fixedly attached to the lower end of the outer tube 05, the second connecting plate 07 serving to attach the release element 02 and the release element 02 being rotatably mounted on the second connecting plate 07; a stop plate 17 is attached to the other end of the outer tube 05, the stop plate 17 serving to limit excessive lifting of the central tube 04.With respect to the central tube 04, a first connecting plate 06 is fixedly attached to the lower end of the central tube 04 (the end facing the second connecting plate 07), with the cylinder tube 08 of the gas spring 01 being attached to the first connecting plate 06; a through-hole is provided in the first connecting plate 06, and the telescopic rod 09 of the gas spring 01 is passed through the through-hole and fixedly connected to the second connecting plate 07, the type of connection being a threaded connection, a welded connection, or a snap-fit ​​connection using a connecting head. Since the telescopic rod 09 is fixedly connected to the second connecting plate 07 and the cylinder tube 08 is fixedly connected to the first connecting plate 06, a telescopic movement of the gas spring 01 results in a relative displacement between the cylinder tube 08 (which carries the central tube 04) and the telescopic rod 09 (which carries the outer tube 05). It should be noted that in this embodiment the gas spring 01 is arranged in a reversed installation position, i.e. the cylinder tube 08 is located at the top (attached to the lower end of the central tube 04), and the telescopic rod 09 extends downwards, penetrates the first connecting plate 06 and is directly attached to the second connecting plate 07. The release element 02 is plate-shaped or rod-shaped and movably attached to the second connecting plate 07. In this embodiment, the release element 02 is connected to the second connecting plate 07 and can rotate about the connection point. One end of the release element 02 is in a position opposite the release pin 10 (with both potentially abutting each other), while the other end extends outside the outer tube 05 to allow actuation by the user. When the user exerts an external force on the release element 02, the end of the release element 02 abutting the release pin 10 depresses the release pin 10. In the present embodiment, the arrangement of the gas spring 01 within the structure of the three-stage telescopic tubes (outer tube 05, middle tube 04 and inner tube 03), wherein the cylinder tube 08 of the gas spring 01 is attached to the first connecting plate 06 on the middle tube 04 and the telescopic rod 09 of the gas spring 01 is passed through the first connecting plate 06 and is connected to the second connecting plate 07 of the outer tube 05, and the arrangement of the release element 02 on the second connecting plate 07, wherein the release element 02 is arranged opposite the release pin 10 of the telescopic rod 09, results in a lifting movement between the outer tube 05 and the middle tube 04 through the interaction of the release element 02 with the gas spring 01;Since the inner tube 03 is connected to the middle tube 04 and the outer tube 05 via the synchronization assembly, the inner tube 03 is coupled to a synchronous lifting movement between the outer tube 05 and the middle tube 04. In contrast to a conventional electric motor drive, the gas spring 01 is used as the drive in the present application, thereby reducing the number of components within the three-stage telescopic tube, simplifying the structure, reducing the overall volume of the three-stage telescopic tube, and increasing its flexibility of use. In an optional embodiment, a mounting tube 11 is provided on the first connecting plate 06, wherein the cylinder tube 08 of the gas spring 01 is arranged inside the mounting tube 11. In this embodiment, the mounting tube 11 serves to protect the cylinder tube 08 of the gas spring 01, wherein the mounting tube 11 is attached to the first connecting plate 06 and a receiving space is provided inside the mounting tube 11, the size of which corresponds to the cylinder tube 08 of the gas spring 01, wherein the cylinder tube 08 is fixed in the receiving space. With further reference to Fig. 2 and Fig.In this optional embodiment, the synchronization assembly comprises a first connecting cable 12, a second connecting cable 13, a first pulley 14, a second pulley 15, and a connecting element 16; wherein the first pulley 14 is arranged at an end of the mounting tube 11 facing away from the first connecting plate 06, the connecting element 16 is arranged on the inner wall of the inner tube 03, one end of the first connecting cable 12 is connected to the connecting element 16, and the other end of the first connecting cable 12, after being deflected around the first pulley 14, is connected to the second connecting plate 07; wherein the second pulley 15 is arranged on the first connecting plate 06, one end of the second connecting cable 13 is attached to the upper end of the inner tube 03, and the other end of the second connecting cable 13, after being deflected around the second pulley 15, is connected to the stop plate 17 arranged on the outer tube 05. In this embodiment, one end of the mounting tube 11 is attached to the first connecting plate 06, and the other end extends into the interior of the central tube 04, with the first roller 14 arranged at the free end. The first roller 14 is freely rotatable about its axis. The connecting element 16 is attached to the inner wall of the inner tube 03, wherein the connecting element 16 can have a block-shaped, ring-shaped or hook-shaped mounting form and serves to fasten one end of the first connecting rope 12. One end of the first connecting rope 12 is firmly connected to the connecting element 16 on the inner wall of the inner tube 03, and the other end extends from the connecting element 16 towards the mounting tube 11, is deflected around the first roller 14 arranged at the end of the mounting tube 11, changes direction, is led back downwards and is finally firmly connected to the second connecting plate 07 on the outer tube 05. The first roller 14 and the second roller 15 are each arranged on opposite sides of the mounting tube 11, with the second roller 15 being arranged on the first connecting plate 06 (e.g. on the top or on the side surface), wherein the second roller 15 is freely rotatable about its axis. The stop plate 17 is attached to an end of the outer tube 05 opposite the second connecting plate 07, with a portion of the stop plate 17 projecting into the outer tube 05. This projecting portion limits the stroke of the intermediate tube 04 to prevent it from detaching from the outer tube 05. The position of the stop plate 17 corresponds to the end section of the second connecting cable 13 and serves to connect it to the other end of the second connecting cable 13. One end of the second connecting rope 13 is attached to the upper end of the inner tube 03, and the other end extends from the upper end of the inner tube 03 towards the first connecting plate 06, is deflected around the second roller 15 arranged on the first connecting plate 06 and is finally firmly connected to the stop plate 17 on the inner wall of the outer tube 05. In this optional embodiment, the stop plate 17 is attached to an end of the outer tube 05 facing away from the second connecting plate 07. The stop plate 17 is connected to the outer tube 05 by means of a snap-fit ​​connection or screws. If the outer tube 05 is cylindrical, the stop plate 17 can also be connected to the outer tube 05 by means of a threaded connection. In this optional embodiment, a third connecting plate 18 is provided at the upper end of the inner tube 03, with the second connecting cable 13 being attached to the third connecting plate 18. In this embodiment, an adjusting screw is provided on the third connecting plate 18, wherein the second connecting cable 13 is connected to the adjusting screw. In this optional embodiment, a fixing sleeve 19 is provided at an end of the mounting tube 11 facing away from the first connecting plate 06, with the first roller 14 being attached to the fixing sleeve 19. In this embodiment, the fixing sleeve 19 is arranged on the outside of the mounting tube 11 and the fixing sleeve 19 is also connected to the mounting tube 11 by a screw connection. With further reference to Fig. 4 and Fig. 5, in an optional embodiment the release element 02 comprises a release lever and a pedal, wherein a mounting block 20 is provided on the second connecting plate 07, the release lever is movably attached to the mounting block 20, one end of the release lever rests against the release pin 10 and the pedal is attached to the other end. In this embodiment, the release lever is movably connected to the mounting block 20 and can rotate around the connection point. One end of the release lever rests against the release pin 10, and the other end is attached to the pedal, which has a non-slip structure so that the user can press the pedal downwards by actuating it with their foot, thereby actuating the release lever and the release pin 10 to open the internal valve of the gas spring 01, thus controlling the extension or retraction of the telescopic rod 09. It should be noted that the release element 02 can be in a horizontal or inclined position, with the pedal being located above the release pin 10 in the inclined position. In an optional embodiment, the three-stage lifting device comprises remote sliding pads 21, wherein the sliding pads 21 are arranged in the gap between the inner tube 03 and the middle tube 04 and in the gap between the middle tube 04 and the outer tube 05. In this embodiment, sliding fits are provided between the inner tube 03 and the middle tube 04, as well as between the middle tube 04 and the outer tube 05. To ensure a uniform lifting process and simultaneously reduce radial impact and friction noise between the tube components, the sliding lining 21 is arranged in the gaps between adjacent sleeves. The sliding friction linings 21 are made of wear-resistant materials with self-lubricating properties, with optional materials including polytetrafluoroethylene (PTFE), oiled polyoxymethylene (POM), polyamide (PA) and polyetheretherketone (PEEK). In an optional embodiment, the first connecting rope 12 or the second connecting rope 13 is designed as a wire rope, UHMW-PE rope, polyarylate fiber rope or polyimide rope. In an optional embodiment, the mounting tube 11 and the first connecting plate 06 are connected to each other by a screw connection.

Claims

A three-stage lifting device, characterized in that it comprises: a gas spring, a release element, an inner tube, a central tube, and an outer tube; wherein the central tube is arranged on the outside of the inner tube, the outer tube is arranged on the outside of the central tube, and the inner tube is connected to the central tube and the outer tube, respectively, via a synchronization assembly; wherein a first connecting plate is provided on the central tube and a second connecting plate is provided on the outer tube, the cylinder tube of the gas spring is attached to the first connecting plate, and the telescopic rod of the gas spring is guided through the first connecting plate and connected to the second connecting plate;wherein the release element is movably attached to the second connecting plate and the release element is arranged opposite the release pin arranged on the telescopic rod, wherein the release element is designed to displace the release pin when actuated. Three-stage lifting device according to claim 1, characterized in that a mounting tube is provided on the first connecting plate and the cylinder tube of the gas spring is arranged inside the mounting tube. Three-stage lifting device according to claim 2, characterized in that the synchronization assembly comprises a first connecting cable, a second connecting cable, a first pulley, a second pulley and a connecting element; wherein the first pulley is arranged at an end of the mounting tube facing away from the first connecting plate, the connecting element is arranged on an inner wall of the inner tube, one end of the first connecting cable is connected to the connecting element and the other end of the first connecting cable, after being deflected around the first pulley, is connected to the second connecting plate; wherein the second pulley is arranged on the first connecting plate, one end of the second connecting cable is attached to the upper end of the inner tube and the other end of the second connecting cable, after being deflected around the second pulley, is connected to the stop plate arranged on the outer tube. Three-stage lifting device according to claim 3, characterized in that the stop plate is attached to an end of the outer tube facing away from the second connecting plate. Three-stage lifting device according to claim 3, characterized in that a third connecting plate is provided at the upper end of the inner tube and the second connecting cable is attached to the third connecting plate. Three-stage lifting device according to claim 3, characterized in that a fixing sleeve is provided at an end of the mounting tube facing away from the first connecting plate and the first roller is attached to the fixing sleeve. Three-stage lifting device according to one of claims 1 to 6, characterized in that the release element comprises a release lever and a pedal, wherein a mounting block is provided on the second connecting plate, the release lever is movably attached to the mounting block, one end of the release lever rests on the release pin and the pedal is attached to the other end. Three-stage lifting device according to claim 1, characterized in that the three-stage lifting device comprises remote sliding pads, wherein the sliding pads are arranged in the gap between the inner tube and the middle tube as well as in the gap between the middle tube and the outer tube. Three-stage lifting device according to claim 3, characterized in that the first connecting rope or the second connecting rope is designed as a wire rope, rope made of ultra-high molecular weight polyethylene (UHMW-PE) rope, polyarylate fiber rope or polyimide rope. Three-stage lifting device according to claim 2, characterized in that the mounting tube and the first connecting plate are connected to each other by a screw connection.

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