| 主权项 |
1. A set of retrievable anchors comprising:
a plurality of substantially planar dead man plates, each plate comprising a perimeter, an upper side and an underside, a first aperture and a second aperture, the first aperture being located in the plate nearer geometric center or center of mass of the plate than the location of the second aperture, the second aperture disposed between the first aperture and the perimeter, for each plate having a first end and a second end, the cord disposed in the plate such that the cord traverses the underside of the plate with the first end of the cord passing through the first aperture and the second end of the cord passing through the second aperture; a tensioning member disposed along the cord between the first and second apertures on the underside of the plate, the tensioning member being larger in size than the first and second apertures, such that selectively exerting a force on the first end of the cord away from the plate causes the tensioning member to press against the underside of the first aperture near the geometric center or center of mass of the plate to provide an anchoring force at the first aperture independent of the second aperture and such that selectively or alternatively exerting a force on the second end of the cord away from the plate causes the tensioning member to press against the underside of the second aperture to provide a retrieval force at the second aperture independent of the first aperture; and one or more of the cords for bounding the plurality of substantially planar dead man plates stacked together in a storage position. |
