Patent ID: 8191601

Claim:
A screen device comprising: a pair of slide guide frames; and a rotatable roller pipe arranged between the pair of slide guide frames, each slide guide frame of the slide guide frames being free at both ends thereof, and capable of development from and reception in both a stationary frame and a slide bar slidable relative to the stationary frame, the roller pipe being capable of sliding in a sliding direction of the slide bar, the roller pipe having one end of each of a first and second screen fixed thereto to enable the first and second screens to be wound around and pulled out from the roller pipe, the roller pipe having a coil spring disposed therein, the roller pipe being configured to rotate and slide in the sliding direction of the slide bar to accumulate an elastic restoring force in the coil spring when the slide bar is slid to pull out the first and second screens, the accumulated elastic restoring force being capable of being released to cause the first and second screens to be wound around the roller pipe, the roller pipe being capable of sliding toward the stationary frame, and the slide bar also being capable of sliding toward the stationary frame, wherein a weight is configured and arranged so as to move in a height direction simultaneously with the development and reception of the slide guide frames, and the weight is configured and arranged so as to brake reception of the slide guide frames due to an increase in potential energy and promote development of the slide guide frames due to a decrease in potential energy.