Coupling ring for ventilation ducts

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 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.

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Inventors:	Mattsson; Lars-.ANG.ke (B.ang.stad, SE), Lennartsson; Kenneth (Torekov, SE), Hogman; Sten (Grevie, SE), Sonden; Carl-Gustaf (Angelholm, SE)
Assignee:	Lindab AB (Bastad, SE)
Appl. No.:	D/135,765
Filed:	January 17, 2001

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Current U.S. Class:	D23/393
Current International Class:	2304
Field of Search:	;D23/393 ;29/890.15 ;72/82-84,86 ;285/363

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References Cited [Referenced By]

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U.S. Patent Documents

D231356	April 1974	Kurr
5129690	July 1992	Meinig et al.
5983496	November 1999	Hermanson

Foreign Patent Documents

	2 311 031		Jun 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.sup.nd ed., SMAGNA Section 1.8ff., pp. 1.12-1.43..

Primary Examiner: Siegel; Mitchell
Attorney, Agent or Firm: Weingarten, Schurgin, Gagnebin & Lebovici LLP