用于自动调平画框或镜框。
专利摘要
公开了一种自动调平画框和镜框的框架水平仪。可枢转的加重摆用作重力参考以控制锁，当框架不水平时，该锁解锁框架相对于另一侧向上倾斜的一侧上的缆线的延伸。可延伸缆线被放出直到框架再次水平，此时可延伸缆线被锁定并防止进一步延伸。当框架侧相对于另一侧向下倾斜或框架水平时，可延伸缆线被锁定并防止在该侧延伸。
Original abstractA frame leveler is disclosed that automatically levels picture frames, and mirror frames. A pivotable, weighted bob is used as a gravity reference to control a lock that unlocks the extension of a cable on the side of a frame that is tilted up with respect to the other side, when the frame is not level. The extensible cable is let out until the frame is once again level, at which point the extensible cable is locked and prevented from extending further. When the frame side is tilted down with respect to the other side, or the frame is level, the extensible cable is locked and prevented from extending on that side.
专利附图（8）
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