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公开(公告)号:US3773311A
公开(公告)日:1973-11-20
申请号:US3773311D
申请日:1971-09-27
Applicant: HARTWELL CORP
Inventor: POE L , HENRICHS B
CPC classification number: B64D11/003 , E05F1/1253 , E05F5/02 , E05Y2600/41 , E05Y2900/502 , E05Y2900/538
Abstract: A control device for overhead doors, pivoted about a horizontal axis at or near their upper ends, the control supplementing the closing force to produce an essentially constant closing force, this being accomplished by compound levers backed by a spring, the spring and levers occupying an overcenter position when the door is fully open to yieldably retain the door in its fully open position, and the control also including an extensible and retractable damping means operable, during closing movement, to maintain a relatively slow but constant speed, the damping means releasing its damping resistance, as the door approaches its closing position, to facilitate latching the door.
Abstract translation: 一种用于顶棚门的控制装置,在其上端处或附近绕水平轴线枢转,所述控制装置补充关闭力以产生基本上恒定的关闭力,其由弹簧支撑的复合杆实现,弹簧和杠杆占据一个 当门完全打开以便将门保持在其完全打开位置时,该控制器还包括可延伸和可缩回的阻尼装置,其在关闭运动期间可操作以保持较慢但恒定的速度,阻尼装置将其释放 阻尼阻力,当门接近其关闭位置时,便于锁定门。