Coupling ring for ventilation ducts

- Lindab AB
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Description

FIG. 1 is a front perspective view of a circular coupling ring of the new design.

FIG. 2 is a rear perspective view of the coupling ring of the new design with a rear double-lip element.

FIG. 3 is a rear view of the coupling ring.

FIG. 4 is a side view of the coupling ring.

FIG. 5 is a front view of the coupling ring.

FIG. 6 is an end view of the coupling ring; and,

FIG. 7 is a cross-section of the coupling ring, showing said rear element, section line VII—VII in FIG. 5.

Claims

The ornamental design for a coupling ring for ventilation ducts, as shown.

Referenced Cited
U.S. Patent Documents
D231356 April 1974 Kurr
5129690 July 14, 1992 Meinig et al.
5983496 November 16, 1999 Hermanson
Foreign Patent Documents
2 311 031 June 1998 GB
Other references
  • AccuFlange: Round & Oval Duct Connection System, Accu Duct Mfg., product brochure, 1998, pp. 1-32.
  • LindabRekt, Instruction manual, Lindab Nord AB, May 20, 1998, pp. 1-4.
  • Rektangulara kanalsystem, Lindab Rekt, product brochure 2000, pp. 1-8.
  • Introduction to the Rectangular Duct Construction Schedules, HVAC Duct Construction Standards Metal and Flexible—2 nd ed., SMAGNA Section 1.8 ff., pp. 1.12-1.43.
Patent History
Patent number: D456071
Type: Grant
Filed: Jan 17, 2001
Date of Patent: Apr 23, 2002
Assignee: Lindab AB (Bastad)
Inventors: Lars-Åke Mattsson (Båstad), Kenneth Lennartsson (Torekov), Sten Högman (Grevie), Carl-Gustaf Sondén (Ängelholm)
Primary Examiner: Mitchell Siegel
Attorney, Agent or Law Firm: Weingarten, Schurgin, Gagnebin & Lebovici LLP
Application Number: 29/135,758
Classifications
Current U.S. Class: Vent, Ductwork, Or Element Thereof (D23/393)
International Classification: 2304;