Vibration absorption mounting for a rooftop air handling unit or the like (II)

Claim 1

An improved pre-assembled vibration absorption system for a rooftop mounted air handling unit or the like, comprising, in combination, at least one lower curb having a laterally extending panel adjacent an upper end thereof and edges in said panel cooperating to bound at least one opening of a selected size therein, a cooperating upper curb disposed on said lower curb, said upper curb having a threaded first bolt attached to extend in depending relation therefrom through said lower curb opening and having a bolt head on the lower end thereof, an inverted U-shaped nut threadably disposed on said threaded bolt for threaded adjustment thereon in the length portion between said bolt head and said lower curb opening, said inverted U-shaped nut being oversized in relation to said lower curb opening so as to be adjustable from a position adjacent said bolt head up along said bolt into engaged relation with said edges bounding said opening to thereby cause the bolting of said upper and lower curbs together to facilitate the handling thereof in shipment to a rooftop site, and a compressible spring-actuated lifting device disposed beneath said bolt head adapted to partake of ascending movement upon the loading of such compressible spring comprised of a vertically oriented helical spring, serving as said compressible spring, a cap having a threaded opening therein in covering relation over the upper end of said spring, and a second bolt in threaded engagement in said cap opening extending into the hollow center of said helical spring, said second bolt being positioned beneath said bolt head of said first bolt of said upper curb, whereby upon the threadable adjustment of said U-shaped nut down along said bolt into a position next to said bolt head causing the unbolting of said upper curb from said lower curb and the downward threaded movement of said cap causing the loading of said compressible spring and in turn causing ascending movement in said lifting device, there is ascending movement in said upper curb relative to said lower curb to thereby allow for vibratory movement of said upper curb relative to said lower curb to the extent permitted by said compressible spring of said lifting device.