| 摘要 |
PROBLEM TO BE SOLVED: To provide a shielding device with a simple composition, which can control an automatic travel speed of a shielding material and has a speed control part with reduced noise during operation.SOLUTION: A shielding device opens and closes a shielding material 4 by a rotation of a wind-up shaft 10 and has a speed control part 36 that controls an automatic travel speed of the shielding material 4. The speed control part 36 comprises a housing, which stores a viscous fluid, and a travel member, which is stored in the housing and moved by the rotation of the wind-up shaft 10. The movement of the travel member accompanies change of a resistance force received by the travel member from the viscous fluid.SELECTED DRAWING: Figure 1 |
