US Patent 10524592 Picture hanging device

Devices, systems and methods for hanging one or more objects, such as frames, on a surface. A marking device for marking a surface for hanging one or more objects. The marking device can have a main body portion having first and second arms pivotably attached thereto. The first and second arms, as well as the main body, can each have a marker to mark a target surface. The marking device can optionally have a level indicator and the first and second arms can have markers which can slide along a ruled measure for convenient positioning of marks on the target surface. Optionally, the markers can have biased, retractable, or sheathed marker pins.