Patent ID: 12245696

REFERENCE NUMERALS

1. desktop;2. lifting column;3. drive device;4. crossbeam;5. side plate;6. retaining plate;7. first bevel gear;8. second bevel gear;9. first spline;10. first screw;11. first bearing;12. second spline;13. second screw;14. positioning housing;15. second bearing;16. bearing seat;17. mounting plate;18. lead screw;19. lifting column tubular component;20. gearbox.

DETAILED DESCRIPTION

Hereinafter, the technical solutions of the present disclosure will be explained and illustrated through embodiments with reference to the accompanying drawings. However, the embodiments are only preferred embodiments of the present disclosure, not all of them. Other embodiments derived by those skilled in the art without exercise of inventive work based on the examples in the embodiments all fall within the protection scope of the present disclosure.

In the description of the present disclosure, it needs to be understood that the orientational or positional relationships indicated by the terms “inner,” “outer,” “upper,” “lower,” “left,” and “right,” refer to those orientational and positional relationships based on the drawings, which are intended only for facilitating description of the disclosure and simplifying relevant illustrations, but not for indicating or implying that the devices or elements compulsorily possess those specific orientations and are compulsorily configured and operated with those specific orientations; therefore, such terms should not be construed as limitations to the present disclosure.

As illustrated inFIGS.1to8, in this embodiment, a lifting desk comprises: a drive device3, a gearbox20, a desktop1, a crossbeam4, and a lifting column2, the crossbeam4being attached to the desktop1, the lifting column2being connected to the crossbeam4, the gearbox20comprising a gear assembly, the drive device3being in driving engagement with the gear assembly, the gear assembly being in driving engagement with the lifting column2; the lifting desk further comprises a retaining plate6, the retaining plate6being fixedly attached to the desktop1, the gearbox20being connected to the retaining plate6.

In this embodiment, the retaining plate6is screw-connected to the desktop1, the gearbox20is screw-connected to the retaining plate6, and the retaining plate6is disposed between the gearbox20and the desktop1; upon assembly, a screw may be mounted downward from above the retaining plate6to connect the retaining plate6to the gearbox20, and a screw may be mounted upward from below the retaining plate6to connect the retaining plate6to the desktop1, whereby mounting and retaining of the gearbox20are facilitated. In addition, the lifting desk further comprises a side plate5, a through-hole being configurable on the side plate5, a screw passing through the hole on the retaining plate6and the through-hole on the side plate5to connect the side plate6to the desktop1; in this way, the side plate5may further limit the retaining plate6from being displaced, whereby secureness of the mounted retaining plate6is enhanced.

The retaining plate6comprises a first section and a second section which are bent relative to each other. The first section is connected to the gearbox20and the second section is connected to the drive device3, such that the retaining plate6may not only connect the gearbox20but also connect the drive device3; in this way, the drive device3may be secured relative to the desktop1. A bend angle between the first section and the second section may be 90°, in which case the drive device3may be securely mounted along the horizontal direction, whereby mounting of the drive device3is facilitated.

In this embodiment, the lifting desk comprises a desktop1and two lifting columns2, and the drive device3simultaneously drives the two lifting columns2to move via a transmission assembly. The transmission assembly comprises two hexagonal rods and one drive rod, the two hexagonal rods being respectively connected to two gearboxes20, two ends of the drive rod being respectively connected to the two hexagonal rods, such that the drive device3may drive, via the hexagonal rod, the lifting column2proximal thereto to move, and drive, via movement transfer by the drive rod, the lifting column2distal therefrom to move.

Each gearbox20comprises an upper housing, a lower housing, and a gear assembly, the upper housing and the lower housing being screw-connected to form a cavity, the gear assembly being disposed in the cavity; the gear assembly comprises a first bevel gear7and a second bevel gear8, the first bevel gear7being connected to the hexagonal rods and circumferentially positioned such that the drive device3may drive, via the hexagonal rod, the first bevel gear7to rotate. The axis of the first bevel gear7is perpendicular to that of the second bevel gear8such that when the straight line where the motor shaft of the drive device3is located becomes perpendicular to the straight line where the lead screw18of the lifting column2is located, the drive device3may still drive the lifting column2to move via the gear assembly, which also allows for horizontal mounting of the drive device3, whereby mounting of the drive device3is facilitated.

The second bevel gear8has a shoulder extended axially, a first bearing11being provided on the shoulder; an inner race of the first bearing11may be interference-fitted with the shoulder and an outer race thereof may be interference-fitted with the lower housing, such that the first bevel gear7is rotatable within the lower housing, and with support by the first bearing11, steadiness of the first bevel gear7is enhanced.

A first hole is provided inside the second bevel gear8, the first hole being coaxial with the second bevel gear8; a first spline9has a positioning seat extended circumferentially, the positioning seat being inserted into the first hole; the first spline9abuts against the first bearing11along the axial direction; the positioning seat has a hexagonal cross section which is fitted with the first hole, such that the first bevel gear7may bring the first spline9to rotate synchronously. A screw hole is provided at one end of the positioning seat. The lifting desk comprises a first screw10. The first screw10is connected to the screw hole on the positioning seat. The axis of the first screw10coincides with that of the second bevel gear8. The first screw10has a round head with a cross-sectional area greater than that of the first hole such that the head of the first screw10may block the second bevel gear8from moving towards the head side of the first screw10; meanwhile the first screw10enables tight clamping of the second bevel gear8, the first bearing11, and the first spline9, allowing for axial positioning of the three.

The first spline9and the second spline12may be fitted in a female-male fashion; or, the first spline9may have a plurality of protrusions extended axially and spaced apart from each other, and the second spline12has a plurality of protrusions extended axially, the protrusions of the second spline12being axially fitted into the spacings between the plurality of protrusions of the first spline9such that the first spline9and the second spline12are interleaving-fitted to enable circumferential positioning. In the case of female-male fitting fashion between the first spline9and the second spline12, the female spline is sleeved outside the male spline such that the male spline may be radially positioned by the female spline, whereby connection secureness between the first spline9and the second spline12is reinforced.

In this embodiment, the first spline9is a male spline and the second spline12is a female spline. The lifting column2is in driving engagement with the gear assembly by fitting the second spline12into the first spline9. The lower housing has a positioning ring extended axially, such that when the second spline12is fitted into the first spline9, the positioning ring is sleeved outside the second spline12to enable radial retaining of the second spline12, whereby the first spline9and the second spline12are positioned more steadily.

The second spline12is sleeved over the lead screw18. A second hole is provided on the second spline12, the second hole being coaxial with the second spline12. The front end of the lead screw18is of a hexagonal shape and fitted with the second hole such that the second spline12and the lead screw18are circumferentially positioned. A screw hole is provided at the front end of the lead screw18. The lifting desk comprises a second screw13, the second screw13being inserted into the screw hole on the lead screw18. The head of the second screw13is of a round shape with a cross-sectional area greater than that of the second hole, whereby axial movement of the second spline12is limited, which prevents the second spline12from slipping off from the front end of the lead screw18.

The lifting column2comprises a lead screw18, a lifting column tubular component19, a mounting plate17, and a locking device, the locking device being detachably connected to the lead screw18, the mounting plate17being tightly clamped between the locking device and the lifting column tubular component19. The locking device may be a thread-fastening device or a rotation-snapping knob, or a press-snapping button. The locking device may comprise a housing, a bearing being configurable between the housing and the locking member inside such that the housing is rotatable relative to the locking member. A locking action of the locking member may bring the housing to move axially to press the mounting plate tightly. The lifting column tubular component19refers to a tubular component of the lifting column2, which may be a tubular component telescoped during lifting of the lifting column2or a tubular component non-telescoped during lifting of the lifting column2. The locking device may be coupled to the lead screw18and configured to press the mounting plate17tightly on a front end face of the lifting column tubular component19, whereby the mounting plate17may be fixed. Alternatively, the mounting plate17may be pressed tightly on the front end face of the lifting column tubular component19by pressing the second spline12tightly.

Since the mounting plate17is nonrotatable relative to the lead screw18, a second bearing15and a bearing seat16for securely holding the bearing are provided on the lead screw18, the bearing seat16being connected to the mounting plate17, the second bearing15being configured such that rotation of the lead screw18does not bring the bearing seat16and the mounting plate17to rotate. Furthermore, the second bearing15, the bearing seat16, and the mounting plate17may be sequentially clamped tightly between the locking device and the lifting column tubular component19; or, the second spline12, the second bearing15, the bearing seat16, and the mounting plate17may be sequentially clamped tightly between the locking device and the lifting column tubular component19.

A positioning housing14is sleeved outside the second spline12. The positioning housing14may envelop the second spline12inside to protect the second spline12. Provision of the positioning housing14may prevent the second spline12from being damaged or broken in case of collisions and may also enhance steadiness of the lifting desk. A gap exists radially between the second spline12and the positioning housing14such that rotation of the second spline12does not cause friction with the positioning housing14affecting service life of the second spline12. The positioning housing14is attached to the bearing seat16and the mounting plate17; this not only enables fixation of the positioning housing14but also encapsulates the front end of the lifting column2such that the lifting column2may be shipped and mounted as an entirety, thereby facilitating assembly and shipping of the lifting desk.

In this embodiment, the locking device refers to the second screw13with the second spline12abutting against the positioning housing14. The second screw13presses the mounting plate17tightly between the second screw13and the lifting column tubular component19by sequentially pressing the second spline12, the positioning housing14, and the bearing seat16tightly. In this embodiment, the positioning housing14comprises two first positioning lugs oppositely arranged, the bearing seat16comprises two second positioning lugs oppositely arranged, and on the mounting plate17are provided two first through-holes oppositely arranged. Corresponding first positioning lugs, corresponding second positioning lugs, and corresponding first through-holes are connected. The first positioning lugs, the second positioning lugs, and the first through-holes may be screw-connected therebetween. By positioning via the two first positioning lugs and the two second positioning lugs, steadiness of the mounting plate17and the lifting column2may be further enhanced, and rotation of the mounting plate17may be further limited.

In this embodiment, the mounting plate17is a U-shaped plate, comprising a bottom plate and two side plates, the bottom plate abutting against the lifting column tubular component19, each side plate having a positioning protrusion extended horizontally, the positioning protrusion being connected to the crossbeam4; this design enables connection of the lifting column2to the crossbeam4. The U-shaped space in the mounting plate17is adapted to accommodate the first spline9, the second spline12, the second bearing15, and the bearing seat16.

What have been described above are only embodiments of the present disclosure; however, the protection scope of the present disclosure is not limited thereto. A person skilled in the art should understand that the disclosure includes, but is not limited to, the contents described in the drawings and the embodiments. Any modifications without departing from the functions and structural principles of the disclosure will be included within the scope of the claims.