초록 ▼

A load lifting device for small watercraft has a vertical post having a lower post portion extending downwardly in the water from the top of the dock and rigidly mounted thereto and having an upwardly extending rectilinear extension and a vertically moveable cradle cantilevered off the post with a w

A load lifting device for small watercraft has a vertical post having a lower post portion extending downwardly in the water from the top of the dock and rigidly mounted thereto and having an upwardly extending rectilinear extension and a vertically moveable cradle cantilevered off the post with a winch at the top of the extension connected to the cradle for raising and lowering it; the upwardly extending extension of the post being mounted on the lower post portion for rotation relative thereto so that when the cradle is moved vertically to a position carried by the extension it may revolve with such extension to swing a watercraft carried by the cradle over the dock or the water as desired. A lock is provided for preventing the post and extension from rotating during transition of the cradle between the two.

대표청구항 ▼

A load lifting device for raising or lowering a load and when raised swinging it about a vertical axis for further raising or lowering comprising, in combination: an elongated vertical post member of polygonal cross-section having an upper end; a post extension member of the same polygonal cross-sec

A load lifting device for raising or lowering a load and when raised swinging it about a vertical axis for further raising or lowering comprising, in combination: an elongated vertical post member of polygonal cross-section having an upper end; a post extension member of the same polygonal cross-sectional configuration as the post member and forming an extension of the post member and mounted coaxially on the upper end thereof for rotatable movement about their common axis and having an upper end; a winch mounted on the upper end of said extension member and carried thereby for rotation therewith; a load supporting cradle cantilevered on one of said members and extending laterally therefrom and having an upwardly facing load supporting surface; means for supporting the cradle on said members for vertically sliding movement therealong and transition between the post member and the extension member; hoisting means extending between said winch and cradle for raising and lowering the cradle upon operation of the winch; and means for supporting said extension member on the post member for rotatable movement thereon when the cradle is cantilevered off the extension member whereby the cradle, winch and hoisting means may be conjointly swung around the axis of said members.