Bob D Oberg

US Patent:

47247509, Feb 16, 1988

Filed:

Dec 4, 1986

Appl. No.:

6/937787

Inventors:

Karen A. Coleman - Surf City NJ
Bob D. Oberg - Buda IL
Gary L. Reinback - Kewanee IL
Robin L. Rediger - Buda IL

Assignee:

Van-Packer Company - Buda IL

International Classification:

F16L 918

US Classification:

98 60

Abstract:

A double-walled chimney comprising inner and outer concentric pipes providing an annular insulating space between them is made up of coaxial end-to-end inner pipes surrounded by concentric, coaxial outer pipes. The inner pipes meet at a junction transverse or radial to the basic axis and are interconnected by an inner, annular ring. The outer pipes stop axially short of meeting so that an annular gap exists that exposes or opens to the junction of the inner pipes. Circumferentially spaced apart spacers are secured to the inner ring and project outwardly as well as axially in opposite directions to engage the outer pipes to keep the latter spaced outwardly from the inner pipes and further to stabilize the outer pipes axially. An outer band connects the outer pipes together and functions also to close the gap between the outer pipes and thus to complete the insulating space at the outer pipe gap.