A linear actuator (1) with the protection mechanism includes: a motor case (10) having a case member (11) with a bottom plate (111) on which a through hole (114) is formed; a drive mechanism (20) accommodated in the case member (11); a transmission mechanism (30) having a machine core (31), a bearing (32), a base seat (33) with an extending plate (332) on which a penetrated hole (333) is formed, and a fasten unit (34) with a head part (341), the machine core (31) is connected to the drive mechanism (20), the bearing (32) is disposed on the base seat (33) and sheathes the machine core (31), the fasten unit (34) is fastened with the bottom plate (111); and a protection structure (40) sheathing the fasten unit (34) and disposed between the bottom plate (111) and the head part (341).

An adjustable desk includes four extendable legs and an open-sided adjustable frame. The open-sided adjustable frame provides an open space between two of the extendable legs such that the open-sided adjustable frame is suitable for supporting a U-shaped desktop.

Height adjustable angled desks are disclosed herein. An example height adjustment system includes a drive system including: a worm gearbox; a motor operatively coupled to the worm gearbox to drive the worm gearbox; and an output shaft operatively coupled to the worm gearbox, the output shaft extending in a first horizontal direction; and an interconnection gearbox coupled to the drive system, the interconnection gearbox to convert rotation of the output shaft to rotation of an interconnection shaft in a second horizontal direction different than the first horizontal direction, the interconnection gearbox including a first cover coupled to a second cover of the worm gearbox, the output shaft extending through the interconnection gearbox.