Coupling ring for ventilation ducts

- Lindab AB
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Description

FIG. 1 is a front perspective view of an oval coupling ring according to a first embodiment of the new design with a front element.

FIG. 2 is a rear perspective view of the coupling ring of the new design.

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 at the central straight portion of the same, showing said front 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
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: D475781
Type: Grant
Filed: Dec 13, 2001
Date of Patent: Jun 10, 2003
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: 29/152,352
Classifications
Current U.S. Class: Vent, Ductwork, Or Element Thereof (D23/393)
International Classification: 2304;