| 摘要 |
In a door closure of the type having hydraulic fluid within a cylinder slowing or dampening the rate of retraction of a spring powered piston-piston rod assembly, a final closing kick action wherein a series of enlargements in the cylinder wall disposed near the fully retracted position of the piston allow the hydraulic fluid suddenly to by-pass the piston as it nears such fully retracted position. The closing kick action is disengagable. Where the normal closing rate of the closure is adjustable by rotation of the hydraulic cylinder a lock mechanism prevents the cylinder from inadvertent rotation except when the lock is manually released.
|
