The present invention addresses a method of providing permanent concealed mounting points for a davit or jib crane on top of a roof patio area or large balcony of a high-rise building; specifically, located at the edges of the roof. It is often the case that large heavy equipment, artwork, furniture or the like needs to be lifted from street level up to a roof patio or large balcony. In these cases a crane is needed to lift these items. These items are too awkward and large to load in a building service elevator (e.g., large pieces of art work, sculptures, paintings, pianos, large pieces of custom furniture or cabinetry) and since the high-rise structure is already built and construction is long over, there is no large crane present that can be used for this function.
Currently, the process of bring these items up to the desired location on the roof patio or large balcony involves disassembling, transporting and reassembling modular cranes on the roof patio or balcony where the load is to be brought. These modular cranes are large, difficult to disassemble and reassemble and time consuming and cumbersome to transport in a building cargo elevator. The present invention provides a method where permanent hard points for the base plate of a davit or jib crane are available on the roof patio or large balcony. These hard points are concealed below paver stone surfaces on the roof patio or large balcony when not in use. The jib crane or davit is small (compared with a standard modular crane) and can be stored on the roof or a utility room of the building and taken out and installed on the permanent concealed hard points when needed.
The hard points are attached directly to the concrete roof slab and hidden below the stone pavers that often make up the surface of high-rise building roof patios or large balconies. Specifically, cover plates made of cementitious material or metal are placed over the hard points when not in use and conceal their existence. In this way, there is no unsightly break in the paver stone finish when the hard points are not being used.
The present invention discloses a preferred embodiment of a method for installing and deploying a concealed metal plate assembly acting as a hard point for mounting a davit or jib crane to the roof slab of a roof patio or large balcony covered with stone pavers on a high-rise building. The metal plate assembly lower flange is affixed to the concrete roof slab and its points of contact are covered by a water proofing membrane. The metal plate assembly upper flange has holes configured to line up with the holes in the davit or jib crane mounting plate. The metal plate assembly when affixed is concealed below the metal pedestals on which the pavers are sitting such that a cover plate can sit over the metal plate assembly on the metal pedestals flush with the paver stones.
The present invention will now be described in terms of the presently preferred embodiment thereof as illustrated in the drawings. Those of ordinary skill in the art will recognize that many obvious modifications may be made thereto without departing from the spirit or scope of the present invention.
The invention is associated with the operation of davit or jib crane on a roof patio or large balcony of a high-rise building. Specifically, with a method if installed concealed hard points for the attachment of a davit or jib crane base plate. These hard points are hidden when not in use and covered by a base plate that is flush with the stone pavers making up the base of the roof patio or large balcony.
In a preferred embodiment of the present invention, a metal plate assembly with a lower flange and upper flange (7) is attached at the lower flange to a concrete slab (3) of a high-rise building.
When a load situated on street level needs to be moved to a roof patio or large balcony of a high-rise building where the metal plate assembly “hard points” have been installed into the concrete slab (3) and near the edge of the roof patio or large balcony, the following method is employed. The base plate (1) is removed exposing the upper flange of the metal plate assembly (7).
Once the davit or jib crane is no longer needed, the base plate of the davit or jib crane is unbolted from the upper flange of the metal plate assembly (7) and removed for storage. The bolts, nuts and lock washers used to secure the metal plate assembly upper flange (7) to the base plate of the davit or jib crane (see,
Many uses and configurations of the present invention may be employed. For instance, the davit or jib crane may be mounted in reverse so that its boom does not extend over the side the high-rise building and instead can be used to lift objects on the roof deck or large patio itself Further, while the instant invention in its preferred embodiment is directed to the use of a davit or jib crane type lifting devices, nothing in the claims set out or in this disclosure would preclude and arrangement of metal plate assemblies (7) configured in such a way to provide for the mounting of any number of crane types.
Those of ordinary skill in the art will recognize that the embodiments just described merely illustrate the principles of the present invention. Many obvious modifications may be made thereto without departing from the spirit or scope of the invention as set forth in the appended claims.
This application claims priority to Provisional Application 62/749,969 filed on Oct. 24, 2018.
Number | Date | Country | |
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62749969 | Oct 2018 | US |