DISPLAY LIFTING DEVICE

摘要

A display lifting device includes: a body; an adjusting unit having big and small wheels coaxially disposed on the body, a shaft fixed to the body, and a rock arm pivotally fixed to the shaft and having first and second arms; a spring having one end fixed to the body; a first rope member wound on the small wheel and having two ends connected to the first arm and the other end of the spring, respectively; and a second rope member wound on the small and big wheels and having one end connected to the second arm, and a sliding unit for carrying a display such that the display is movable between a first position and a second position. Since the sum of torques produced on the first and second arms is kept equal to zero, the display can stop at any position between the first and second positions.

主权项

1. A display lifting device, comprising:
a body; an adjusting unit having a wheel group having a big wheel and a small wheel coaxially disposed on the body, a shaft fixed to the body, and a rock arm member pivotally fixed to the shaft and having a first arm and a second arm extending outward from the shaft; a spring having a first end fixed to the body; a first rope member wound on the small wheel and having one end connected to the first arm and the other end connected to a second end of the spring; a second rope member wound on the small wheel and the big wheel and having one end connected to the second arm; and a sliding unit connected to the other end of the second rope member and used for carrying a display such that the display is movable between a first position and a second position, wherein a first angle is formed between the first rope member and the first arm and a second angle is formed between the second rope member and the second arm, when the display moves from the first position toward the second position, the second rope member is pulled to cause the second arm and the first arm to pivotally rotate relative to the shaft and thereby cause the first rope member to stretch the spring such that the first angle and the second angle vary with extension of the spring, thus keeping a sum of torques produced on the first arm and the second arm with respect to the shaft equal to zero.