Ventilator unit

Claim 2

A ventilator unit mountable over a wall opening to regulate the passage of air through said wall opening and comprising a frame member mountable around said wall opening and provided with an open central section, a cover member for said open central section, means supporting said cover member with the underside surface thereof in overlying relationship with said frame member and for shifting said cover member between alternative closed and open positions relative to said open central section of said frame member, said last-mentioned means including a lever arm section pivotally mounted from said frame member for travel to and fro within said open central section along an arcuate path between a position adjacent to said frame member and at least one other position more remote from said frame member, said cover member having means cooperating with the underside surface thereof to define a slide track receiving said lever arm section and providing a slide track path paralleling the underside surface of said cover member and accommodating sliding movement of said lever arm section relative to said cover member as said lever arm section is being pivoted between said positions, said closed position of said cover member being coordinated to correspond to the position of said lever arm section when the latter is adjacent said frame member and said open position of said cover member being coordinated to correspond to a position of said lever arm section more remote from said frame member.

Claim 3

A ventilator unit mountable over a wall opening to regulate the passage of air through said wall opening and comprising a frame member mountable around said mountable opening and provided with an open central section, a cover member for said open central section, means disposed on opposite respective sides of said cover member pivotally mounting said cover member in overlying relationship with said frame member and providing a pair of pivotal axes for pivotable movements of each of said opposite sides of said cover member between closed and alternatively variable open positions relative to said open central section of said frame member, said last-mentioned means including a pair of pivotable lever arm sections slidably deployed in guide tracks on said cover member and providing said pivotal axes, said guide tracks accommodating sliding relative movements of said lever arm sections and said pivotal axes towards and away from each other thereby varying the relative spacing between said lever arm sections and said pivotal axes while the same are being pivoted to shift said cover member between said closed and open positions.

Claim 4

A ventilator unit mountable over a wall opening to regulate the passage of air through said wall opening and comprising a frame member mountable around said mountable opening and provided with an open central section, a cover member for said open central section, means disposed on opposite respective sides of said cover member pivotally mounting said cover member in overlying relationship with said frame member and providing a pair of pivotal axes for pivotable movements of each of said opposite sides of said cover member between closed and alternatively variable open positions relative to said open central section of said frame member, said last-mentioned means including a pair of pivotable lever arm sections slidably deployed in guide tracks on said cover member and providing said pivotal axes, said guide tracks accommodating sliding relative movements of said lever arm sections and said pivotal axes towards and away from each other thereby varying the relative spacing between said lever arm sections and said pivotal axes while the same are being pivoted to shift said cover member between said closed and open positions.

Claim 5

A ventilator unit as defined in claim 2, wherein each of said lever arm sections provides a pivotal axis about which to pivot said cover member in response to movement of the other of said lever arm sections.

Claim 6

A ventilator unit mountable over a wall opening to regulate the passage of air through said wall opening and comprising a frame member mountable around said wall opening and provided with an open central section, a cover member for said open central section, means disposed on opposite respective sides of said cover member pivotally mounting said cover member in overlying relationship with said frame member and providing a pair of pivotal axes for pivotable movements of each of said opposite sides of said cover member between closed and alternatively variable open positions relative to said open central section of said frame member, said last-mentioned means including a pair of pivotable lever arm sections independently pivotable relative to each other and slidably deployed in guide tracks on said cover member accommodating sliding movements of each of said lever arm sections towards and away from each other as each is being pivoted to shift said cover member between said closed and open positions.

Claim 7

A ventilator unit mountable over a wall opening to regulate the passage of air through said wall opening and comprising a frame member mountable around said wall opening and provided with an open central section, a cover member for said open central section, means disposed on opposite respective sides of said cover member pivotally mounting said cover member in overlying relationship with said frame member and providing a pair of pivotal axes for pivotable movements of each of said opposite sides of said cover member between closed and alternatively variable open positions relative to said open central section of said frame member, said last-mentioned means including a pair of pivotable lever arm sections independently pivotable relative to each other and slidably deployed in guide tracks on said cover member accommodating sliding movements of each of said lever arm sections towards and away from each other as each is being pivoted to shift said cover member between said closed and open positions.

Claim 8

A ventilator unit as defined in claim 4, wherein pivotal movement of one of said lever arm sections pivotally shifts one side of said cover member relative to said frame member and wherein movement of the other of said lever arm sections pivotally shifts the other side of said cover member relative to said frame member.

Claim 9

A ventilator unit as defined in claim 5, wherein movement of each of said lever arm sections pivotally shifts each opposite side of said cover member relative to said frame member.

Claim 10

A ventilator unit as defined in claim 4, wherein said frame member and said cover member are provided with cooperatively aligned seating surfaces on said cover member and said frame member, whereby to snugly seat said cover member against said frame member when said cover member is positioned in closed position relative to said frame member.

Claim 11

A ventilator unit to regulate the passage of air admitted and exhausted through a wall opening comprising, in combination: a frame member defining an open central section through which to accommodate the passage of air through said wall opening, a cover member for selectively regulating the passage of air through said open central section of said frame member, crank means for operatively shifting the positioning of said cover member relative to said open central section of said frame member, said crank means including a pair of axially elongated crank arms longitudinally spanning a medial region of said open central section and mounted from opposite ends of said frame member for pivotal movements about mutually tangential first pivotal axes, intermediate the pivotal mountings thereof said crank arms having elongated eccentric sections radially offset respectively from said pivotal axes and providing a second pair of pivotal axes, said elongated eccentric sections being arranged to pivot about said first pivotal axes between lowered positions with said elongated eccentric sections being offset in substantially oppositely disposed directions and raised positions with said elongated eccentric sections being offset in substantially similarly disposed directions, said cover member being provided with a slide track defining a slide track path disposed transversely of said first pivotal axes and containing said lever arm sections therein and accommodating slidable guided movements along said slide track path, said slide track also accommodating pivotal movements of said cover member about each of said lever arm sections and thereby about each of said second pair of pivotal axes, means for independently pivoting each of said crank means about said first pair of pivotal axes and thereby independently pivotally shifting each of said lever arm sections and each of said second pair of pivotal axes within said guide track, whereby to pivotally urge said cover member between cLosed and open positions corresponding respectively to said lowered and raised positions of said elongated eccentric sections of said crank means.

Claim 12

A ventilator unit to regulate the passage of air admitted and exhausted through a wall opening comprising, in combination: a frame member defining an open central section through which to accommodate the passage of air through said wall opening, a cover member for selectively regulating the passage of air through said open central section of said frame member, crank means for operatively shifting the positioning of said cover member relative to said open central section of said frame member, said crank means including a pair of axially elongated crank arms longitudinally spanning a medial region of said open central section and mounted from opposite ends of said frame member for pivotal movements about mutually tangential first pivotal axes, intermediate the pivotal mountings thereof said crank arms having elongated eccentric sections radially offset respectively from said pivotal axes and providing a second pair of pivotal axes, said elongated eccentric sections being arranged to pivot about said first pivotal axes between lowered positions with said elongated eccentric sections being offset in substantially oppositely disposed directions and raised positions with said elongated eccentric sections being offset in substantially similarly disposed directions, said cover member being provided with a slide track defining a slide track path disposed transversely of said first pivotal axes and containing said lever arm sections therein and accommodating slidable guided movements along said slide track path, said slide track also accommodating pivotal movements of said cover member about each of said lever arm sections and thereby about each of said second pair of pivotal axes, means for independently pivoting each of said crank means about said first pair of pivotal axes and thereby independently pivotally shifting each of said lever arm sections and each of said second pair of pivotal axes within said guide track, whereby to pivotally urge said cover member between cLosed and open positions corresponding respectively to said lowered and raised positions of said elongated eccentric sections of said crank means.

Claim 13

A ventilator unit as defined in claim 8, wherein one of said crank arms raises and lowers one side of said cover member relative to said frame member and wherein the other of said crank arms raises and lowers an opposite side of said cover member relative to said frame member.

Claim 14

A ventilator unit as defined in claim 8, including manipulating means for selectively manipulating each of said crank arms independently of each other.

Claim 15

A ventilator unit as defined in claim 10, including means for releasably locking said manipulating means in a plurality of alternative positions corresponding to selectively variable closed and open positions of the cover member.

Claim 16

A ventilator unit as defined in claim 8, including screening superimposed over said open central section for preventing the passage of insects therethrough.