| 摘要 |
An umbrella comprising a staff, a canopy, and chords having their outer ends secured to the canopy margin and their inner ends slidable on the staff and being under the influence of a spring while the canopy is moved from folded position to open position and wherein the canopy is under tension when it is open and wherein the canopy, the chords, and a portion of the staff form a stabilizing triangular structure when the canopy is open.
|
