SPECIFICATION F

We have worked with combination spring and neoprene hangers for over 45 years. This serial arrangement of materials is extremely effective. Our older designs, and many of the standard designs of our competitors had the common fault of not allowing enough angular hanger rod misalignment. The rod could strike the side of the hanger box where the rod passes through the hole and short circuit the spring. In order to solve the problem, it was necessary to design a new series of springs that were relatively short and larger in diameter so we could enlarge the size of the hole in the bottom of the hanger box. Another improvement was the molding of a LDS Rubber cup that sockets the spring and provides a protective bushing where the rod passes through the hanger box hole. The thirty degree requirement is a way of describing this clearance and the callout of a scale drawing of the hanger to show this capability is the only assurance that no one will submit a look alike that does not have this important capability.

Hangers shall consist of rigid steel frames containing minimum 11/4”(32mm) thick LDS rubber elements at the top and a steel spring with general characteristics as in specification B seated in a steel washer reinforced LDS rubber cup on the bottom. The LDS rubber element and the cup shall have LDS rubber bushings projecting through the steel box. In order to maintain stability the boxes shall not be articulated as clevis hangers nor the LDS rubber element stacked on top of the spring. Spring diameters and hanger box lower hole sizes shall be large enough to permit the hanger rod to swing through a 30° arc from side to side before contacting the cup bushing and short circuiting the spring. Submittals shall include a hanger drawing showing the 30° capability. Hangers shall be type 30N as manufactured by Mason Industries, Inc.