| 摘要 |
<p>An umbrella frame is described having dome ribs, each including an inner section, a telescopic middle section, and an outer section hingedly connected to the middle section for movement between a position colinear with the middle section and a position with the outer section folded over the middle section. A geats is slidable on the inner section, and a stretcher member is hinged to the main runner as well as to the geats. A second geats member is slidable on the inner section and is connected to the end of the middle dome rib section. An auxiliary runner is slidable on the stick between the main runner and the crown. A strut member is hinged to the auxiliary runner and to the stretcher member, and a control link is hinged to the stretcher member, a short distance from the hinge of the first geats, and at the other end the control link member is pivotally connected to an inner extension of the outer dome rib section. Such a construction allows, as the main runner is slid on the stick away from the crown, the dome ribs to pivot downwardly to a position parallel with the stick as the first geats member slides on the inner dome rib section, leaving the middle dome rib section and the outer dome rib section fully extended, and as the runner is further moved on the stick away from the crown, it will cause the first geats to slide on the dome rib section away from the crown, and a control link will cause the outer dome rib section to fold onto the middle dome rib section.</p> |
