ELECTRIC LIFTING PLATFORM

Abstract

An electric lifting platform includes a platform table, a two-way screw fixed below a bottom surface of the platform table, a motor including an output end fixedly connected to one end of the two-way screw, a sliding device fixed on the bottom surface of the platform table and parallel to the two-way screw, and two movable frames. First ends of the two movable frames are fixed at positions on the bottom surface of the platform table close to two ends of the platform table, respectively. Second ends of the two movable frames are connected to two screw nuts of the two-way screw, respectively, and also connected to two ends of the sliding device, respectively.

Claims

1. An electric lifting platform comprising: a platform table; a two-way screw fixed below a bottom surface of the platform table; a motor including an output end fixedly connected to one end of the two-way screw; a sliding device fixed on the bottom surface of the platform table and parallel to the two-way screw, the sliding device including two sets of sliding assemblies provided on two sides of the two-way screw, respectively, each of the two sets of sliding assemblies including a sliding rail arranged on the bottom surface of the platform table and parallel to the two-way screw; and two movable frames, first ends of the two movable frames being fixed at positions on the bottom surface of the platform table close to two ends of the platform table, respectively, and second ends of the two movable frames being connected to two screw nuts of the two-way screw, respectively, and connected to two ends of the sliding device, respectively; wherein a length of each of the sliding rails is shorter than a distance between the first ends of the two movable frames.

2. The electric lifting platform according to claim 1, wherein each of the two sets of sliding assemblies further includes: two sliders fixedly connected to the second ends of the two movable frames, respectively.

3. The electric lifting platform according to claim 1, wherein a stroke of each of the sliding rails is greater than or equal to twice of a one-way stroke of the two-way screw.

4. The electric lifting platform according to claim 2, wherein each of the movable frames includes: a connecting plate fixedly connected to one of the screw nuts and one of the sliders; and two linkage assemblies provided at two ends of the connecting plate, respectively, ends of the linkage assemblies being hinged to the platform table.

5. The electric lifting platform according to claim 4, wherein each of the linkage assemblies includes: a primary bar, an end of the primary bar being hinged to an end portion of the connecting plate; and a secondary bar, a first end of the secondary bar being hinged to the bottom surface of the platform table, and a second end of the secondary bar being hinged to a middle portion of the primary bar.

6. (canceled)

7. The electric lifting platform according to claim 5, wherein: the end of the primary bar is a first end of the primary bar; a length of the primary bar is twice of a length of the secondary bar; a distance between a second end of the primary bar and the second end of the secondary bar is greater than or equal to the length of the secondary bar; and a one-way stroke of the two-way screw is greater than or equal to the length of the secondary bar.

8. (canceled)

9. (canceled)

10. (canceled)

11. The electric lifting platform according to claim 5, wherein the end of the primary bar is hinged to an end side surface of the connecting plate.

12. The electric lifting platform according to claim 5, wherein a distance between the two sliding rails is shorter than a distance between the two primary bars of the two linkage assemblies.

13. The electric lifting platform according to claim 1, wherein a length of the two-way screw equals the length of each of the sliding rails.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawing incorporated into the description and constituting a part of the description show the embodiments of the present disclosure, and is used for explaining the principle of the present disclosure in combination with the description. In the drawing, similar reference numerals represent similar elements. The drawing described hereinafter shows some but not all of the embodiments of the present disclosure. A person of ordinary skill in the art can obtain other drawings according to the drawing without any creative effort.

[0020] FIG. 1 illustratively shows a structural diagram of an electric lifting platform according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE PRESENT DISCLOSURE

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described in conjunction with the drawing in the embodiments of the present disclosure. Apparently, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art without any creative effort on the basis of the embodiments in the present disclosure shall fall into the scope of the present disclosure. It is to be noted that, the embodiments in the present application and the features in the embodiments can be combined at will so long as there is no conflict.

[0022] The basic idea of the present disclosure is as follows: two sets of movable frames are driven to move by the movement of a two-way screw, to realize the lifting and descending of a platform table for working; and the movable support and auxiliary guide rail are provided for the movable frames by the cooperation of a sliding rail and sliders provided in parallel to the two-way screw with the two-way screw, to reduce the stress and the wear of the screw, so that the stability of the lifting and descending of the platform table and the unhindered telescoping of the movable frames are simultaneously ensured. The two-way screw is driven to rotate by a motor, and the motor' starting and stopping is controlled by an operating button, so that one-button operation of an electric lifting platform is realized and the operation process is simplified.

[0023] The electric lifting platform of the present disclosure will be described below in detail with reference to the drawings.

[0024] FIG. 1 shows a structural diagram of an electric lifting platform according to an embodiment of the present disclosure, when viewed from the bottom. Referring to FIG. 1, the electric lifting platform includes a platform table 1, a two-way screw 2, a sliding device 5, a motor 3 and two sets of movable frames 4. Wherein, the two-way screw 2 is fixed in parallel to a bottom surface of the platform table 1. To save space, in this embodiment, the two-way screw 2 is fixed on the bottom surface of the platform table 1. An output end of the motor 3 is fixedly connected to one end of the two-way screw 2, and the two-way screw 2 is driven to run by the motor 3. The two-way screw 2 includes a ball screw having opposite threads at two ends and matched screw nuts 21. When the motor 3 rotates forward, the two-way screw 2 is driven to rotate and the two screw nuts 21 run in a same direction or in an opposite direction along the two-way screw 2; and when the motor 3 rotates backward, the two screw nuts 21 run in an opposite direction or in a same direction together with the rotation of the two-way screw 2.The sliding device 5 is fixed on the bottom surface of the platform table 1 and is parallel to the two-way screw 2, and the first ends of the two sets of movable frames 4 are respectively fixed at two ends of the bottom surface of the platform table 1 and the second ends thereof are respectively connected to the two screw nuts 21 of the two-way screw 2 and two ends of the sliding device 5. The movable frames 4 slide along the sliding device 5 together with the rotation of the two-way screw 2, and additional support is provided to the movable frames 4 by the sliding device 5, so that the movable frames 4 are ensured to move stably while the running load of the two-way screw 2 is reduced. The reliable and smooth lifting and descending of the platform table 1 are realized, and the deviation during or after the lifting or descending, which has an impact on both the normal operation of the platform table 1 and the service life of the lifting mechanism, is efficiently avoided.

[0025] In the electric lifting platform of the present disclosure, mainly with the use of the motor 3, the movable frames 4 are driven to move by the driving of the two-way screw 2, and the smoothness of the movement is ensured by the sliding device 5, so that the lifting and descending of the platform table 1 is realized. In the embodiment shown in FIG. 1, threads at two ends of the two-way screw 2 are opposite in direction, thus the two sets of movable frames 4 are arranged in a same direction or in an opposite direction. In another embodiment, a one-way screw 2 having two screw nuts or two screws with the same direction and pitch may be used to respectively drive the two sets of movable frames 4 to move. In this case, the moving directions of the two sets of movable frames 4 are the same, so the mounting directions are the same, to ensure the stability of the platform table 1 during the lifting and descending.

[0026] As shown in FIG. 1, the sliding device 5 includes at least one set of sliding assemblies 50, and each set of sliding assemblies 50 includes a sliding rail 501 and two sliders 502 provided on the sliding rail 501. The sliding rail 501 is arranged on the bottom surface of the platform table 1 and parallel to the two-way screw 2, and the two sliders 502 are fixedly connected to the second ends of the two sets of movable frames 4 respectively. When moving in two opposite directions along the two-way screw 2, the two sets of movable frames 4 slide along the sliding rails 501 by means of the sliders 502 and are fitted with the two-way screw 2 by means of the sliding rails 501, to ensure the smooth running of the movable frames 4 and extend the service life of the two-way screw 2.

[0027] In the embodiment shown in FIG. 1, the sliding device 5 includes two sets of sliding assemblies 50. Two sliding rails 501 are respectively provided on two sides of the two-way screw 2 and in parallel to the two-way screw 2, to ensure the smooth and unhindered movement of the movable frames 4 together with the two-way screw 2 during the rotation of the motor 3, and to efficiently realize the smooth and reliable lifting and descending of the platform table 1 in the case of one power output. In some embodiments, the strokes of the sliding rails 501 are greater than or equal to twice of the one-way stroke of the two-way screw 2, to ensure the moving stroke of the movable frames 4 and to maximize the lifting and descending distances of the platform table 1.

[0028] In the electric lifting platform of the present disclosure, each set of movable frames 4 includes a connecting plate 41 and two pairs of linkage assemblies 42 provided at two ends of the connecting plate 41 in a same direction. The first ends of the linkage assemblies 42 are hinged to the platform table 1 and the second ends thereof are hinged to the connecting plate 41, and the connecting plate 41 is fixedly connected to the screw nuts 21 and the sliders 502 of the sliding device 5. The linkage assemblies 42 perform telescopic moving as the connecting plate 41 moves along the two-way screw 2 and the sliding rail 501 by means of the screw nuts 21, and then the platform table 1 is correspondingly driven to move, so that the smooth lifting and descending of the platform table 1 is realized.

[0029] As shown in FIG. 1, each of the linkage assemblies 42 includes a primary bar 421 and a secondary bar 422, and the lifting and descending of the platform table 1 is realized by the hinged connection between the primary bar 421 and the secondary bar 422 and the changes in the angle between them. As shown, the first end of the primary bar 421 is hinged to an end portion of the connecting plate 41, and the first end of the secondary bar 422 is hinged to the bottom surface of the platform table 1 and the second end of the secondary bar 422is hinged to the middle portion of the primary bar 421. When the two screw nuts 21 are separated from each other due to the operation of the motor 3, driven by the connecting plate 41, the first end of the primary bar 421 and the first end of the secondary bar 422 in a same linkage assembly 41 move towards each other, and the included angle between the secondary bar 422 and the primary bar 421 is gradually reduced, so that the platform table 1 is gradually raised with the support of the primary bar 421. On the contrary, if the two screw nuts 21 move close to each other, driven by the connecting plate 41, the included angle between the secondary bar 422 and the primary bar 421 is gradually increased and the platform table 1 is gradually descended.

[0030] In another embodiment, in order to reduce the requirement on the initial torque of the motor 3, the linkage assembly 42 further includes a tension spring (not shown). The first end of the tension spring is connected to the first end of the primary bar 421 and the second end of the tension spring is connected to the first end of the secondary bar 422, so that a tension is applied between the first end of the primary bar 421 and the first end of the secondary bar 422 in real time. Since the first end of the secondary bar 422 is relatively fixed, that is, the second end of the tension spring is relatively fixed, a spring tension is applied to the first end of the primary bar 421 in real time to get the primary bar 421 close to the secondary bar 422, so as to reduce the initial torque of the motor 3.

[0031] To achieve the lifting and descending of the platform table 1 to the greatest extent, in the electric lifting platform of the present disclosure, the length of the primary bar 421 is greater than or equal to twice of the length of the secondary bar 422, and the distance between the second end of the primary bar 421 and the second end of the secondary bar 422 is greater than or equal to the length of the secondary bar 422, so that when the platform table 1 is descended to the lowest position, the secondary bar 422 and the primary bar 421 are completely overlapped (the two bars can be laterally overlapped in parallel), to minimize the thickness of the electric lifting platform. Meanwhile, the distance between the first end of the primary bar 421 and the second end of the secondary bar 422 is equal to the length of the secondary bar 422, that is, the secondary bar 422 can be completely overlapped with the first end of the primary bar 421, and the platform table 1 is in the highest condition in this case. However, in order to ensure the stability of the platform table 1 in the highest condition, the minimum distance between the first end of the primary bar 421 and the first end of the secondary bar 422 is set to be greater than 0. For example, the distance between the first ends of the linkage assemblies 42 in the two sets of movable frames 4 is greater than the length of the two-way screw 2. In addition, the one-way stroke of the two-way screw 2 can be greater than or equal to the length of the secondary bar 422, to ensure the stroke of the two-way screw 2 meet the requirement on the lifting and descending stroke of the platform table 1. The situation that the lifting height of the platform table 1 is limited due to a too short stroke of the two-way screw 2 can be avoid.

[0032] It is to be noted that, in one embodiment, the cross section of the primary bar 421 can be a U-shaped structure with an internal width greater than the width of the secondary bar 422 and a depth greater than the thickness of the secondary bar 422. When the platform table 1 is in the lowest position, the secondary bar 422 is received within the U-shaped structure of the primary bar 421, so that the thickness of the overall structure can be further reduced and the appearance is improved.

[0033] In addition, the electric lifting platform of the present disclosure can further include a thrust spring (not shown), two ends of the thrust spring are respectively connected to the second ends of the two sets of movable frames 4, and the thrust spring is arranged in parallel to the two-way screw 2. For example, two ends of the thrust spring can be respectively connected to the connecting plates of the two sets of movable frames 4, and the requirement on the initial torque of the motor 3 is reduced by pushing two connecting plates. In the structure shown in FIG. 1, two ends of the thrust spring can be respectively fixed at the first ends of the primary bars 421 (which are in a same side) of the two sets of movable frames 4, or can be respectively fixed on two sliders 502 of a same set of sliding assemblies 50, as long as it is ensured that the telescopic direction of the thrust spring is parallel to the direction of the two-way screw 2. Therefore, it ensures that the direction of the force applied to the movable frames 4 by the thrust spring is consistent with the direction of the force by which the two-way screw 2 drives the movable frames 4 to move, and thus the initial torque of the motor 3 is reduced.

[0034] Since the one-way stroke of the two-way screw 2 is greater than or equal to the length of the secondary bar 422, that is, the one-way stroke of the two-way screw 2 is greater than the maximum moving distance of the movable frames 4. Therefore in order to avoid the movement of the two-way screw 2 driven by the motor 3 exceeding the maximum moving distance of the movable frames 4, the electric lifting platform of the present disclosure further includes a limit switch electrically coupled to the motor 3. For example, the limit switch can be a contact switch or a non-contact switch, for example, a photoelectric limit switch. Exemplarily, a photoelectric limit switch can be provided on a preset position of the two-way screw 2, or a contact switch can be provided on a position, which is close to the first end of the secondary bar 422, of the first end of the primary bar 421.The motor 3 is controlled to stop running by trigger signals from the limit switch, to avoid the damage to the movable frames 4 because of exceeding the maximum stroke of the movable frames 4. The damage to the movable frames 4 will influence the lifting and descending of the platform table 1.

[0035] The electric lifting platform can further include electrical elements such as a power supply and a controller. An electrical box can be provided in the mounting position of the motor 3 on the bottom surface of the platform table 1, and elements such as the motor and the controller can be placed within the electrical box. Such a design can simplify the appearance, realize the integration of the apparatus, efficiently realize dust prevention, extend the service life of electrical elements, and provide for easy maintenance.

[0036] In order to conveniently control and use the apparatus, the electric lifting platform can further include operating buttons provided on a top surface or an edge portion of the platform table 1 and electrically coupled to the motor 3 or the controller. For example, lifting and descending button and memory button can be provided, so that the operation process is simplified and the stepless lifting and descending of the platform table 1 can be realized according to the demand of users.

[0037] The electric lifting platform of the present disclosure can be used for both office desks and other consoles, and efficiently avoids the adverse impact on the body of a user caused by maintaining a posture for a long period of time. For example, when the electric lifting platform is applied on the office desk, the platform can be arbitrarily adjusted from, e.g., about 8 cm to about 37 cm according to the need of the user, and the platform can be adjusted by a corresponding height according to the demand in various different occasions such as conferences explanation, personal work and communication at work. By the operating buttons on the platform table 1, the operation and use is simple and convenient, so that the platform has a broad application prospect.

[0038] The contents described above can be implemented independently or jointly in various ways, and these transformations shall fall into the protection scope of the present disclosure.

[0039] It is to be noted that, as used herein, the relational terms such as first and second are merely used for distinguishing one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between the entities or the operations. Moreover, the terms comprise/comprising, contain/containing, or any other variants thereof are non-exclusive, so that a process, method, object or device containing a series of elements contains not only these elements, but also other elements not explicitly listed, or further contains inherent elements of the process, method, object or device. Without more restrictions, an element defined by the statement comprises an/a . . . does not exclude other identical elements in the process, method, object or device including this element.

[0040] Finally, it is to be noted that the foregoing embodiments are merely used for describing the technical solutions of the present disclosure and not intended to limit the technical solutions of the present disclosure. Although the present disclosure has been described in detail with the foregoing embodiments, it should be understood by a person of ordinary skill in the art that modifications still can be made to the technical solutions described in the foregoing embodiments or equivalent replacements can be made to part of technical features, and these modifications or replacements will not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions in the embodiments of the present disclosure.