A lifting table stand includes a pair of telescopic columns, a carrier, an actuation module and a passive mechanism. Each telescopic column includes multiple tubes adapted to sheathe with each other and move telescopically relative to each other. The carrier includes a beam straddling the telescopic columns and a pair of support members perpendicularly connected to two ends of the beam. The actuation module includes a receiving member detachably installed to the beam and a driver connected to the receiving member. The passive mechanism includes a transmission shaft and a pair of gear sets installed in the tubes. The transmission shaft passes the driver and is connected to each gear set. Since the receiving member is detachably installed to beam, the actuation module may be changed to different types to control the elevation of the lifting table stand.

A leg structure of an electric table includes a pair of support assemblies (10), multiple horizontal rods (20) and a pair of drive assemblies (30). The support assemblies (10) are arranged spacedly and parallelly to each other. Each support assembly (10) includes a connecting rod (11) and a pair of telescopic posts (12). Each telescopic post (12) is connected and fixed to the connecting rod (11). Each horizontal rod (20) is separately connected to each support assembly (10) and is parallel to each other. Each drive assembly (30) is separately received in each support assembly (10) for driving each telescopic post (12) to ascend or descend. Therefore, the leg structure of an electric table may be easily assembled and the whole structure is stable.

A leg structure of an electric table includes a pair of support assemblies (10), multiple horizontal rods (20) and a pair of drive assemblies (30). The support assemblies (10) are arranged spacedly and parallelly to each other. Each support assembly (10) includes a connecting rod (11) and a pair of telescopic posts (12). Each telescopic post (12) is connected and fixed to the connecting rod (11). Each horizontal rod (20) is separately connected to each support assembly (10) and is parallel to each other. Each drive assembly (30) is separately received in each support assembly (10) for driving each telescopic post (12) to ascend or descend. Therefore, the leg structure of an electric table may be easily assembled and the whole structure is stable.

A lifting table stand includes a pair of telescopic columns, a carrier, an actuation module and a passive mechanism. Each telescopic column includes multiple tubes adapted to sheathe with each other and move telescopically relative to each other. The carrier includes a beam straddling the telescopic columns and a pair of support members perpendicularly connected to two ends of the beam. The actuation module includes a receiving member detachably installed to the beam and a driver connected to the receiving member. The passive mechanism includes a transmission shaft and a pair of gear sets installed in the tubes. The transmission shaft passes the driver and is connected to each gear set. Since the receiving member is detachably installed to beam, the actuation module may be changed to different types to control the elevation of the lifting table stand.

A lifting table stand includes a pair of telescopic columns, a carrier, an actuation module, and a passive mechanism. Each telescopic column includes multiple tubes adapted to sheathe with each other and move telescopically relative to each other. The carrier includes a beam straddling the telescopic columns and a pair of support members perpendicularly connected to two ends of the beam. The actuation module includes a receiving member detachably installed to the beam and a driver connected to the receiving member. The passive mechanism includes a transmission shaft and a pair of gear sets installed in the tubes. The transmission shaft passes the driver and is connected to each gear set. Since the receiving member is detachably installed to beam, the actuation module may be changed to different types to control the elevation of the lifting table stand.

An electric table stand, a coupling thereof, and an electric table with the electric table stand; the electric table stand includes a holder, two support legs, and a transmission apparatus. The two support legs are detachably connected to two ends of the holder and parallel to each other. Each of the support legs includes a screw rod and a first transmission shaft driving the screw rod to rotate. The transmission apparatus is assembled in the holder, and includes a motor, a second transmission shaft driven by the motor and at least one coupling. The coupling includes a first joint connected to the first transmission shaft, a second joint connected to the second transmission shaft, and a flexible body flexibly pushing the second joint to be correspondingly connected to the first joint.

An electric lifting device includes one driving mechanism and at least two transmission mechanisms, the two transmission mechanisms cooperating mutually and connected through a transmission bar assembly, with one transmission bar assembly driven by the driving mechanism. Each transmission mechanism includes a gearbox, a first driving gear, a second driving gear with axes of the first and second driving gears being crossed vertically, and lifting table legs disposed below at least two of the transmission mechanisms and driven by the second driving gear of the corresponding transmission mechanism to be lifted synchronously. The present invention employs only one driving mechanism, and with respect to the structure employing multiple driving mechanisms, the electric lifting device in the present invention can not only prevent interference to guarantee higher consistency, but also reduce devices to lower the difficult in control, thereby significantly reducing the cost.

A frame for sit-stand-tables comprising a longitudinal member (3), two height-adjustable legs (6, 7) with at least two telescopic profiles, namely an outer and an inner profile, and with a driving mechanism, driven by a motor unit (39), comprising an electric motor (46) and a gear. According to the invention the motor unit (39) is arranged in the longitudinal member (3) and connected to the driving mechanism in the height-adjustable legs (6, 7). Thus, a frame with a simplified construction is achieved. The construction of the legs (6, 7) can be simplified and at the same time the dimensions can be reduced, as it is not necessary to take the building-in of a motor into the legs into consideration. As both legs (6, 7) are driven by a joint motor unit (39), the electric control can also be simplified as it will not have to drive the two legs synchronously.

A lifting table stand includes a pair of telescopic columns, a carrier, an actuation module, and a passive mechanism. Each telescopic column includes multiple tubes adapted to sheathe with each other and move telescopically relative to each other. The carrier includes a beam straddling the telescopic columns and a pair of support members perpendicularly connected to two ends of the beam. The actuation module includes a receiving member detachably installed to the beam and a driver connected to the receiving member. The passive mechanism includes a transmission shaft and a pair of gear sets installed in the tubes. The transmission shaft passes the driver and is connected to each gear set. Since the receiving member is detachably installed to beam, the actuation module may be changed to different types to control the elevation of the lifting table stand.

A height adjustable desk includes a work surface, a first telescoping leg, a second telescoping leg, a driving device, and a switch device. The first telescoping leg and the second telescoping leg are connected to the work surface, and are driven by the driving device to lift or low the work surface to any desired height. The switch device is mounted on the first telescoping leg to be activated when the work surface is moved to a predetermined position. The switch device will turn the motor off to stop the work surface when the switch device is activated.