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Round-pipe-starter-fitting

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Round pipe starter fitting

Details

Inventors: Kauffman, Melvin E.;
Assignee: Tru-Fit Mfg., Inc. (Lathrop, CA)
Primary Examiner: Callaghan; Thomas F.
Assistant Examiner:
Attorney, Agent or Firm: Jacobson; Harvey B.

A tubular body is provided having first and second ends and the first end includes structure for connection with one end of a tubular duct while the second end of the body defines a peripherally extending and outwardly opening groove. A pair of semi-annular sheetmetal sections have their inner peripheral portions edgewise engaged and seated within the groove at the first end of the tubular body and the semi-annular sections are of slightly greater than 180.degree. in angular extent and have their opposite ends overlapped and joined together. The semi-annular sections, after being joined together, define an annular collar mounted on the first end of the tubular body against removal therefrom and the side of the annular collar facing outwardly of the first end of the tubular body has an annular resilient gasket mounted thereon whose outer side includes an adhesive coating for adhesive securement to a duct wall about an opening formed in that duct wall.

DETAILED DESCRIPTION Conventionally, in the heating and air conditioning duct field various interdigitated flange sections must be cut and bent from those areas of a main duct wall defining an opening therein and a mounting flange portion of a tubular fitting to be registered with the opening for communicating a branch duct with the interior of the main duct.
The flange portions of the main duct are then secured to corresponding portions of the fitting by sheet metal screws and the flange portions of the fitting are secured to the sheet metal duct wall about the opening by sheet metal screws.
This type of connection is subject to considerable air leakage and is time consuming to effect.
In addition, other types of duct fittings of substantially one-piece construction heretofore have been provided for substantially airtight adhesive connection with the wall area of a duct disposed about an opening formed therein for joining a branch duct to a main duct.
However, these previously known forms of adhesive equipped fittings are expensive to produce and still require the utilization of attaching screws which are time consuming to install.
Accordingly, a need exists for an improved form of fitting for joining and communicating a branch duct to a main duct and its interior.
The connecting fitting of the instant invention includes a tubular body having first and second ends with the first end including structure for telescopic connection with one end of a branch duct.
The second end of the tubular body defines a peripherally extending and outwardly opening groove and a substantially annular sheet material collar assembly has its inner periphery tightly seated in the aforementioned groove.
The side of the collar assembly remote from the first end of the tubular body includes an annular gasket mounted thereon having an adhesive outer surface for adhesive securement to the outer surface of the wall portion of a main duct disposed about an opening formed therein.
The annular collar assembly includes a pair of substantially semi-annular sheet material sections of slightly greater than 180

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