Abstract: A screw rod self-locking device includes a one-way bearing and a mounting seat, and an inner hole of the one-way bearing is sleeved at an end of a screw rod. A mounting hole for receiving the one-way bearing is disposed on the mounting seat, and the one-way bearing is rotatably fitted into the mounting hole along a circumferential direction. An adjusting mechanism for adjusting a circumferential locking force of the mounting hole for the one-way bearing is disposed on the mounting seat so as to adjust a size of a friction force between an outer wall of the one-way bearing and an inner wall of the mounting hole. A height-adjustable leg and a height-adjustable desk applying the same are further provided. In this way, a size of a self-locking friction force to be overcome during backward rotation of a screw rod can be self-defined, thereby guaranteeing consistency of product performances.

Abstract: A height-adjustable desk includes a desk board and a base. Two first lifting arms and one second lifting arm are disposed between the desk board and the base. The two first lifting arms are disposed at both sides of the desk board respectively. The second lifting arm is located between the two first lifting arms and spatially intersected with the two first lifting arms to be distributed in an X shape. The upper ends of the two first lifting arms are rotatably connected to a first end of the desk board, and the lower ends of the two first lifting arms are slidably connected to a first end of the base. The upper end of the second lifting arm is slidably connected to a second end of the desk board, and and the lower end of the second lifting arm is hinged to a second end of the base.

Abstract: A screw rod self-locking device includes a one-way bearing and a mounting seat, and an inner hole of the one-way bearing is sleeved at an end of a screw rod. A mounting hole for receiving the one-way bearing is disposed on the mounting seat, and the one-way bearing is rotatably fitted into the mounting hole along a circumferential direction. An adjusting mechanism for adjusting a circumferential locking force of the mounting hole for the one-way bearing is disposed on the mounting seat so as to adjust a size of a friction force between an outer wall of the one-way bearing and an inner wall of the mounting hole. A height-adjustable leg and a height-adjustable desk applying the same are further provided. In this way, a size of a self-locking friction force to be overcome during backward rotation of a screw rod can be self-defined, thereby guaranteeing consistency of product performances.

Abstract: A height-adjustable desk includes a desk board and a base. Two first lifting arms and one second lifting arm are disposed between the desk board and the base. The two first lifting arms are disposed at both sides of the desk board respectively. The second lifting arm is located between the two first lifting arms and spatially intersected with the two first lifting arms to be distributed in an X shape. The upper ends of the two first lifting arms are rotatably connected to a first end of the desk board, and the lower ends of the two first lifting arms are slidably connected to a first end of the base. The upper end of the second lifting arm is slidably connected to a second end of the desk board, and and the lower end of the second lifting arm is hinged to a second end of the base.