| 摘要 |
A door operator mechanism includes a spring biased piston 5 having a non-return valve 6 in its end face slidably disposed in a hydraulic cylinder 3 and coupled to a door lever arm through a pinion shaft 11, a pinion gear 9, and a tooth rack 7 on the piston. If the door is opened beyond a normal angle a rod member 16 disposed within the spring 4 engages and compresses a resilient member 15 disposed between one end of the cylinder and the spring. The resilient member has a higher coefficient of resiliency than the spring and thus is not initially compressed thereby, and its restraining force increases sharply at high compression ratios, to thereby increasingly resist door overtravel.
|
