Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Superimposed three-dimensional units
Utility Patent
1999-04-01
2001-01-02
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Superimposed three-dimensional units
C052S585100, C052S586100, C052S651070, C187S401000, C187S242000, C187S414000, C414S594000
Utility Patent
active
06167670
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a casing system for dumbwaiters and more particularly to the type that is pre-fabricated and ready for on site assembly.
2. Description of the Related Art
Many dumbwaiter mechanisms have been designed in the past. Typically, these mechanisms require the construction of a shaft with a casing that extends from floor to floor. Due to fire hazard concerns, different jurisdictions require the shaft's casing to provide walls with fire retarding characteristics, typically, no less than 1.5 hours. These nonuniform regulations, along with lack of familiarity with this otherwise useful and time saving apparatus, have limited their use in new buildings and/or made it very expensive to implement. The present invention provides a ready made, stackable casing system that can be adapted to most structural situations.
None of the dumbwaiter systems known to the applicant provide for this novel approach for the installation of a shaft casing. Other patents describing the closest subject matter provide for a number of more or less complicated features that fail to solve the problem in an efficient and economical way. None of these patents suggest the novel features of the present invention.
SUMMARY OF THE INVENTION
It is one of the main objects of the present invention to provide a system of stackable shaft casing assemblies to form a continuous vertical passage through which a dumb-waiter is raised and lowered, and these assemblies can be adapted to practically any dimensions within a reasonable range.
It is another object of this invention to provide a system of stackable shaft casing assemblies that can be readily assembled on site.
It is yet another object of this invention to provide a system of such stackable shaft casing assemblies that is volumetrically efficient for transportation and storage and since it comprises mostly standard components, the inventory logistics are greatly reduced.
Further objects of the invention will be brought out in the following part of the specification, wherein detailed description is for the purpose of fully disclosing the invention without placing limitations thereon.
REFERENCES:
patent: 5980160 (1999-11-01), Vanderklaauw
patent: 6047509 (2000-04-01), Savoic
Reite John
Reite John David
Friedman Carl D.
Horton Yvonne M.
Sanchelima J.
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