External vents

Abstract

A sloped roof vent has a coated steel plate with a raised center and a gasket receiver is formed around a central hole. A structural body is crimped with a gasket in the receiver. The body has an outer wall extending downward over the receiver. A sloping wall extends inward and a vertical wall supports a second sloping wall with an inner rim. A damper staked to an axle covers the rim. Inserts keep the damper from chattering and fully closing. Wind walls prevent outer drafts from lifting the damper. Two fasteners attach caps to the outer wall. Lanced and pressed ledges on a push-in hose connector permanently engage windows on the inner rim of the structural body. A snap-in screen and a hose connector reducer complete a package.

Claims

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.

2. The apparatus of claim 1, wherein the duct connector is tubular, the vent housing structure comprises a tubular element which is configured to engage with the duct connector, the first openings are windows having borders and second sloping parts are pressed from tubular surfaces of the duct connector at the piercings, and wherein upon relative sliding of the exhaust connection and the duct connector, the borders of the windows or the pressed sloping parts or both are automatically deformed until and reformed when the pressed sloping parts extend into the windows.

3. The apparatus of claim 2, wherein the vent housing structure comprises a covered vent structure having a round wall, and the duct connector has a round wall is adapted for connecting to the round wall of the covered vent structure.

4. A system for providing forced exhaust through a penetration in a building surface comprising a covered vent structure, a duct connector to a duct from an exhaust source within the building, to direct an exhaust flow from the building, the covered vent structure being provided with at least one opening perpendicular to the exhaust flow direction, the at least one opening comprising a rigid window structure situated at an upstream side of the opening and a recessed guide portion tapered in an upstream direction for alignment with the duct connector adapted to extend through the building surface for connection to a duct from the exhaust source with the building, the duct connector being provided with integrally formed inward pierced openings, the pierced openings having formed on an upstream end of the duct connector, and the pierced portion being sloped toward a downstream end of the duct connector, wherein when the downstream end of the duct connector is slidably engaged with the upstream end of the covered vent structure, and the sloped pierced and bent inward portions align with the window portions and both are stretched during engagement until the duct connector enters the windows of the covered vent structure, whereupon both portions return to their original shapes and become permanently locked together.

5. The apparatus of claim 3, wherein once connected, the vent housing structure and the duct connector form an inseparable closed duct path to allow the flow of exhaust gases from a source within a building to a terminal exit opening outside of the building, isolating and preventing leakage of the exhaust gases within the building.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is an exploded view of parts of the vent.

(2) FIG. 2 shows the parts and assembly steps.

(3) FIG. 3 is a perspective view of the vent structural molding.

(4) FIG. 4 is a cross section side view of the vent structural molding.

(5) FIG. 5 is a side view of the duct connector.

(6) FIG. 6 is a detail of the duct connector.

(7) FIG. 7 is a perspective view of the damper.

(8) FIG. 8 is a cross-section view of a damper stop.

(9) FIG. 9 is a perspective view of the outer metal vent cover.

(10) FIG. 10 is a side cross section of the inner molded vent cover.

(11) FIG. 11 is a perspective view of the removable screen.

(12) FIG. 12 is a cross sectional view of a duct connector adapter.

(13) FIG. 13 is an isometric view of the roof mounted forced air exhaust vent apparatus ready for installation on a sloped roof surface, adapted for use with shingled, slate, or tile roof covering materials.

(14) FIG. 14 is a view of the roof mounted forced air exhaust vent apparatus ready for installation on a sloped roof surface, adapted for use with metal roof covering materials.

(15) FIG. 15 shows a connection between the housing structure and the duct connector.

DETAILED DESCRIPTION

(16) The new roof vent 1 has a flashing plate base 10 that is large and flat at the bottom 11 and has a deep drawn raised central portion 13 that supports a housing structural body 30 inside a premium acrylonitrile styrene acrylate (ASA) subcap 70 within a galvanized steel KYNAR polyvinylidene fluoride (PVDF) coated outer cap 80. The inner and outer caps are joined to the housing structural body 30 with machine grade marine grade stainless steel clip 90 and black oxide stainless steel screws 95.

(17) In one embodiment a rectangular large flat bottom has nailing slots at its sides, which are for use on a shingle roof. The slots are replaced with dimples or holes 17 all around for screwing to metal roofs. A duct connector 100 quickly and permanently attaches to the internal housing structure.

(18) FIG. 1 is an exploded view of the roof vent. The flashing plate 10 is a 24 gauge galvanized, primed and KYNAR-coated plate with screw holes 17 or preparatory dimples along all edges, including the rounded top edge 19. A large flat base 11 has a deep drawn raised central portion 13 with a top gasket receiver crimping groove 15 that receives an ethylene polypropylene diene monomer (EPDM) gasket 20. The gasket is inserted in the top groove 15 of the base 10. The groove is crimped around the gasket after it is inserted on a downward protruding rim 41 in the housing structural body 30, as shown in FIG. 2.

(19) The angled middle wall 31 of the housing structure 30 allows for condensation drainage. The built-in wind walls 33 are separated by drainage openings 35. EPDM noise plugs 60 inserted in the upper wall 38 of the housing structure 30 eliminate clatter of the aluminum damper 50. The noise reducer plugs 60 hold the damper 50 slightly open and allow a small amount of warm air flow outward between the lower edge of the damper 50 and the sloped upper wall 38 of housing structure 30, helping prevention of freezing of condensate in winter.

(20) Situated on sloped upper wall 38 at the terminal airflow exit from housing structure 30 is a raised inner rim 39 which acts to prevent condensate drainage on sloped upper wall 38 from entering the airflow exit bore connected to the exhaust duct from the interior living space of the building. The perimeter of the lower edge of damper 50 is sized to be larger than the perimeter of the raised inner rim 39 and is positions such that when in the closed condition the perimeter of the lower edge of damper 50 completely circumscribes the raised inner rim 39. This predetermined sizing and positioning permits any condensate which may form on the underside of damper 50 from warm moist natural air movement from within the living spaces of the building to drain and drip from the lower edge perimeter of the damper 50 onto the sloped upper wall 38 and drain outward and downward onto sloped surface 31 and out onto the roof surface. When in use the damper 50 is opened rotationally about damper axle 51 held in recess 56 by differential air pressure. When in the open and in-use condition any condensate which forms on the damper 50 will drain along the inner surfaces of the domed damper to the lowest portion of the perimeter and drip off onto sloped upper surface 38 and drain downward and outward on the roof surface. Condensate drainage is again protected from entering the exhaust duct by raised inner rim 39. Damper axles 51 are situated outside of the lower edge perimeter of damper 50 such that no dripping of condensate can flow to or enter the recess 56 which captures and provides bearing surfaces for axle 51 on either side of damper 50.

(21) The deep drawn domed shaped damper 50 has a passivated stainless steel axle 51 fixed to one side of the damper. The domed shaped geometry provides structure and rigidity even though the damper is formed of thin lightweight materials.

(22) Subcap 70 is made of a premium ASA polymer that provides extreme performance for a lifetime of service. A 24 gauge galvanized steel KYNAR-coated outer cap 80 provides long life protection of the assembly. Joined together, the inner and outer caps are cap assembly 85.

(23) Two marine grade stainless steel fastener clips 90 slide-up grooves 91 in outer sides 32 of the housing structure 30. Black oxide stainless steel threaded fasteners 95 extend through openings 97 in sides of the outer cap 80 and the subcap 70 and tightly engage the caps with the clips 90 on the housing structure 30. Removing fasteners 95 enables the caps to be lifted, which is important for clothes dryer vent cleaning.

(24) A screen 110 is provided for connection between the inner cap 70 and the housing structure 30. The duct connection pipe 100 to be inserted before installation completes the roof vent 1 assembly.

(25) A pressure sensitive very high bond (VHB) seal 120 is also provided for metal roof application.

(26) FIG. 2 shows assembly of the roof vent. The roof vent is assembled after the large flashing plate 10 has the deep drawn central portion 13 formed with an inward crimping gasket receiver 15. The housing structure 30 is shown in an inverted position with its downward protruding rim 41 ready to receive EPDM rubber gasket 20. The detail “A” of the inverted housing structure 30 shows a Tinnerman clip 90 being placed over the edge in the recesses 91 of the outer side wall 32 of the housing structure 30.

(27) The housing structure 30 with the gasket 20 in place is turned right side up, and the gasket 20 with the inserted inner rim ring 41 is pushed into the gasket receiver 15 in the top of the flashing plate 10. The gasket receiver is then crimped tightly and permanently with a crimping machine, holding the gasket 20 and the housing structure 30 connected permanently with the flashing plate 10.

(28) Detail “B” shows one of the receiving holes 61 for receiving the plugs 60 that are noise reducers and damper stops for preventing full closure of the damper 50. Detail “B” also shows the internal duct connector receiving holes 45 that permanently secure the duct connector pipe 100 to the housing structure 30.

(29) The next step is adding the damper 50 with its stainless-steel axle 51 held in recesses 56 at the top of upward projections 55 on the housing structure 30. Outward ends of stainless-steel axle 51 are held and rotate within recesses 56 when the damper 50 is forced open by differential pressure. The positioning of recesses 56 at the top of upward projections 55 is outside of the main perimeter of the domed shaped damper 50 and any condensate which may form and drain from the inner surfaces of domed shaped damper 50 will drain downward and away from the recesses 56 thereby aiding in the prevention of moisture accumulation within recesses 56 which might freeze during cold temperatures potentially preventing proper operation of the damper 50.

(30) The metal outer vent cap 80 is mounted on the inner ASA plastic subcap 70, forming a cap assembly 85. The combined vent caps 80 and 70 in cap assembly 85 are joined in the vent assembly 1 with a torque controlled screw machine tightening the black oxide coated threaded stainless steel fasteners 95 in the marine grade stainless steel fastener clips 90 on the housing structure 30.

(31) After inspection 2 of the assembled parts, the assembled roof vent 1 is wrapped and packaged with separately wrapped VHB seal 120, screen assembly 110, duct connector 100 and a duct adapter 130 for connecting the vent assembly 1 with a duct connector 100 to a smaller vent duct.

(32) As shown in FIGS. 3 and 4, the housing structure 30 has a raised annular sloped middle wall 31 which drains water and condensate outward from the structure. A surrounding outer wall 32 is spaced outward from the raised central part 13 of the flashing plate 10, as shown in FIGS. 1 and 2. A raised vertical wall 37 of the housing structure 30 supports a flat sloping upper wall 38 and an inner rim 39 which underlie the damper. This raised inner rim 39 has a smaller perimeter than the terminal lower edge of the damper 50 so that any and all condensate formed on the underside of the domed metal damper 50 will drain to the outside of raised inner rim 39 onto sloping upper wall 38 where it can drain downward and out of the vent onto the roof surface. In this manner the larger perimeter of damper 50 and the smaller perimeter of inner rim 39 act to prevent condensate from draining backwards into the duct from the living space of the building. A front of the vertical wall 37 has raised wind walls 33 which deter incoming wind from lifting the damper 50. Drain openings 35 between the wind walls 33 drain any condensate from upper wall 38. Noise-reducing damper stops 60 are permanently plugged into holes 61 in the upper wall 38 to prevent clatter and to slightly raise the lower edge of damper 50 relative to upper wall 38 to allow rising warm air to prevent freezing of condensate.

(33) The down flow prevention damper 50 is manufactured from a thin sheet metal and covers the inner rim 39. An inner perimeter of damper 50 is larger than the outer perimeter of the inner rim 39. Damper 50 is pivotally coupled to displace angularly about an axle 51. Axle 51 allows the domed damper 50 to rotate to a closed position when no forced air exhaust is flowing and to an open position when forced exhaust flow is present. The mass of the damper 50 closes it when no positive air flow exhaust is present. The domed shape of damper 50 coupled with its enlarged inner perimeter allows any condensate which might form on the inner domes surface to flow outward to points peripherally outside the inner rim 39 that the damper covers, thereby preventing condensate from running back down into the exhaust conduit hose. The sloped upper wall 38 receives the dripped condensate and guides it down towards the terminal exit of the vent apparatus 1 and down and onto the sloped roof.

(34) Slight recesses 91 in the outer sides 32 of the housing structure 30 receive Tinnerman clips 90. Holes 113 in the front of the housing structure 30 shown in FIG. 3 receive tabs 112 at the bottom of the screen 110, as shown in FIG. 11. The upward projecting posts 55 at the rear of the housing structure body 30 have receiver grooves 56 for holding ends of the axle 51 of the damper 50, as shown in FIGS. 2, 3, 4 and 7.

(35) FIG. 5 is a side view of the duct drop connector 100. The duct connector 100 is easily, quickly and permanently connected to support body 30 of vent 1. The duct connector is an important part that allows an entire roof vent assembly to be packaged and protected for shipping and then to be easily, quickly and permanently assembled in the vent for connecting the vent to a building vent duct or hose before installation of the vent on a roof. The duct connector 100 has small pierced and bent inward connections 101 with sloped tops 103 and flat bottoms 105, as shown in the bottom view detail of FIG. 6. As the duct connection is inserted over the round wall 42 on the housing structure 30, the sloped tops 103 push inward on walls of the structure body 30 until the flat bottoms 105 of duct connector 100 project through windows 45 in the downward extending round wall 42 of the housing structure 30. The flat bottoms 105 engage the windows 45, in a one-way locking fashion, preventing withdrawing of the duct connector from the housing structure 30 once installed.

(36) In some applications a polymeric label with pressure sensitive adhesive on one side may be utilized by wrapping the label circumferentially around the pierced end of the duct connector 100 providing instructions for the installation and physically closing and blocking fluid communication which might be possible through the openings formed when piercing the feature 101 in the duct connection tube 100.

(37) FIG. 7 is a detail of the anodized aluminum damper 50 crimped and staked to the axle 51.

(38) FIG. 8 is a cross-sectional enlarged view of the resilient damper stop plug 60.

(39) FIG. 9 is an inside perspective view of the galvanized steel KYNAR-coated outer cap 80. Tabs 82 are permanently bent inward to secure the outer cap 80 to the inner cap 70. The outer cap 80 is made from deep drawn zinc coated galvanized steel covered with a KYNAR PVDF coating. Holes 97 in sides receive fasteners. The outer cap fits tightly over the inner cap 70.

(40) FIG. 10 is a side cross-sectional view of the ASA polymer inner cap 70. The inner cap 70 is made out of ASA polymer to tightly fit inside the outer cap 80. Aligned holes 97 in sides of caps 80 and 70 receive fasteners. The sides 73 of the inner cap 70 fit tightly around the outer wall 32 of the housing structure 30, as shown in FIG. 3. Inner elements 75 rest on angled middle wall 31 of the housing structure 30 and provide a stopping surface for the Cap assembly 85 when installed. Likewise, the top surfaces of upper projections 55 of the housing structure 30 provide another stopping surface allowing the inner surface of polymer inner cap 70 to rest when cap assembly 85 is installed. The structure provided by these stopping surfaces positions the cap assembly 85 correctly for alignment of holes 97 in the cap assembly 85 and the speed nut fastener 90 affixed to the housing structure 30. In addition, the structure provided by these stopping surfaces prevents damage due to high forces applied to the top of cap assembly 85, for example a person stepping on the vent inadvertently.

(41) FIG. 11 is a perspective view of a screen assembly 110 that fits in the outer vent opening between the structural body 30 and the inner cap 70. The frame 111 has tabs 112 to fit in holes 113 in the structural body 30 shown in FIG. 3. A hole 114 connects to clip 115 in inner cap 70 shown in FIG. 10.

(42) FIG. 12 shows a cross-section of a 4″ to 3″ reducer 130, as shown in FIG. 2.

(43) FIG. 13 shows a vent 1 with a flashing plate 12 with nailing slots 14 configured for mounting on a shingled roof.

(44) FIG. 14 shows a vent 1 with a flashing plate 12 with fastener holes or indentations 17 configured for mounting on a metal roof.

(45) FIG. 15 shows a detail of the housing structure 30. The bent inward connections 101 of duct connector 100 protrude through the windows 45 in the housing inner cylindrical wall 47.

(46) It is important to note that the cross-sectional area for air flow through the vent changes in a manner to always increase with each transition through the device. As such, the cross-sectional area for flow at the duct connection is the smallest flow area in the device. The geometry of the domed damper 50 acts to shape the airflow and reduce drag and the cross-sectional area open for flow beneath the damper 50 when opened is larger than the cross-sectional area at the duct connection. The cross-sectional area open for flow though the screen assembly 110 is again larger than the cross-sectional area for air flow beneath the damper 50 when opened. Finally, the cross-sectional area for air flow at the terminal exit from the vent with the screen assembly 100 removed is larger than the cross-sectional area for air flow through the screen assembly 110. This cascading to ever larger cross-sectional areas for air flow through the device serves to keep the drag or pressure drop through the device minimized.

(47) While the invention has been described with reference to specific embodiments, materials of construction, modifications and variations of the invention may be constructed without departing from the scope of the invention, which is defined in the following claims.