US 11,692,355 B1
External vents
Roger Cline, Bluemont, VA (US); and Mark Maclean-Blevins, Westminster, MD (US)
Assigned to LIFETIME TOOL & BUILDING PRODUCTS, LLC, Winchester, VA (US)
Filed by Lifetime Tool & Building Products, LLC, Winchester, VA (US)
Filed on Feb. 22, 2021, as Appl. No. 17/180,977.
Application 17/180,977 is a division of application No. 16/369,338, filed on Mar. 29, 2019, granted, now 10,927,550.
Int. Cl. E04D 13/143 (2006.01); E04D 13/00 (2006.01)
CPC E04D 13/143 (2013.01) [E04D 13/004 (2013.01)] 5 Claims
OG exemplary drawing
 
1. Apparatus comprising:
a vent housing structure and a duct connector,
the vent housing structure having first connectors,
the duct connector having second, complementary, connectors,
the first connectors comprising first openings with first ledges,
the second connectors having piercings and sloping parts formed in a surface of the duct connector, and the sloping parts having second ledges,
the vent housing structure and the duct connector being configured for relative sliding on each other to align the first openings with the second sloping parts,
whereupon when the first openings and the sloping parts are aligned, the second sloping parts enter the first opening and place the second ledges in position to contact the first ledges, permanently preventing withdrawal or separation of the vent housing structure and the duct connector.