| 摘要 |
<p>A gas spring (20) is connectable between a movable object (22) and a relatively fixed object (24) for assisting in moving the movable object between a first position and a second position. The gas spring includes a cylinder (28) having a closed end (32) and an open end (34). A piston rod extends (42) into the cylinder through the open end in a sealing relationship thereto for axial movement relative to the cylinder. A piston assembly (64) is carried by the rod for axial movement within the cylinder. The piston and the rod move in a compression direction when the movable object moves towards its first position and an extension direction when the movable object moves towards its second position. A resilient annular seal (72) carried by the piston assembly has a flexible outer portion configured to provide a gas seal between the piston assembly and the cylinder sufficient to maintain the movable object at a stopped position at any point between its first and second positions</p> |
