Coupling element for connecting the flanged ends of ducts

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Description

FIG. 1 is a perspective view taken from the top and one side of a coupling element for connecting the flanged ends of ducts in the closed state;

FIG. 2 is a perspective view from the opposite side of the coupling element in the closed state; and,

FIG. 3 is a perspective view of the coupling element in the open state.

The bottom of the design is a mirror image of the top.

Referenced Cited
U.S. Patent Documents
3023032 February 1962 Johnston et al.
3338599 August 1967 Hallman
3677517 July 1972 Root et al.
4077434 March 7, 1978 Sieckert et al.
4564227 January 14, 1986 Murck
Foreign Patent Documents
2038434 July 1980 GBX
Patent History
Patent number: D335173
Type: Grant
Filed: Jun 22, 1990
Date of Patent: Apr 27, 1993
Inventors: Stefan Leufstedt (S-271 44 Ystad), Carl-Eric Jaderberg (S-393 23 Kalmar)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Lisa Lichtenstein
Law Firm: Merchant & Gould Smith, Edell, Welter & Schmidt
Application Number: 7/542,165
Classifications
Current U.S. Class: Vent, Ductwork, Or Element Thereof (D23/393)