Coupling ring for ventilation ducts
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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 and a rear double-lip 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.
FIG. 7 is a cross-section of the coupling ring at the central straight portion of the same, showing said front and rear elements, section line VII—VII in FIG. 5.
FIG. 8 is a front perspective view of an oval coupling ring according to a second embodiment of the new design with a narrow front element and a rear double-lip element.
FIG. 9 is a perspective view of the coupling ring of the new design.
FIG. 10 is a rear view of the coupling ring.
FIG. 11 is a side view of the coupling ring.
FIG. 12 is a front view of the coupling ring.
FIG. 13 is an end view of the coupling ring; and,
FIG. 14 is a cross-section of the coupling ring at the central straight portion of the same, showing said front and rear elements, section line XIV—XIV in FIG. 12.
Claims
The ornamental design for a coupling ring for ventilation ducts, as shown.
2 311 031 | June 1998 | GB |
- 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 1.8ff., pp. 1.12-1.43.
Type: Grant
Filed: Jan 17, 2001
Date of Patent: Aug 20, 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: 29/135,765
International Classification: 2304;