Fume hood

Claim 2

In a fume hood employing laterally slidably closure means for the access opening thereof, the combination of a fume hood housing cooperable with a plurality of movable closure members to form a chamber, with said members forming at least a part of a sidewall of such chamber and movable laterally relative to said housing and one another to provide an opening in such wall by means of which access may be effected to the chamber inTerior, means for discharging auxiliary air adjacent the exterior of said closure members comprising a duct structure disposed above said chamber and having a discharge opening adjacent the top of said closure members, and means cooperable with said first means responsive to lateral movement of said closure members for operatively varying the amount of auxiliary air discharged therefrom in response to changes in the relative positions of said closure members, said air varying means comprising damper members arranged to extend across the duct structure forming a damper assembly operative to control the amount of air therethrough, and means for effecting movement of said damper member in response to movement of said closure members.

Claim 3

A fume hood as defined in claim 1, wherein said means for effecting damper movement comprises respective members, each rigidly connecting a respective damper member to the corresponding closure member whereby such damper member is movable with the associated closure member.

Claim 4

A fume hood as defined in claim 3, wherein said damper means are coextensive in lateral width with the associated closure members, said dampers being spaced upwardly from the adjacent hood structure to form an air bypass opening through which air may flow when said dampers are in closed positions, said chamber being provided with an opening therein communicating with said bypass opening whereby said bypass air may flow into said chamber.

Claim 5

A fume hood as defined in claim 3, wherein said chamber opening is disposed adjacent the top edge of said closure members.

Claim 6

A fume hood as defined in claim 4, wherein said duct structure is divided laterally by respective baffle members operative to direct air flow resulting from an open damper member to adjacent the open closure member carrying such damper.

Claim 7

A fume hood as defined in claim 4, wherein said duct structure has a generally L-shaped portion, extending across the housing at the top thereof and downwardly across the housing at said closure members with said duct having a discharge opening disposed adjacent the tops of said closure member at the exterior thereof, and deflector means extending across the duct and disposed to direct air passing through the damper assembly through such discharge opening, said baffle members being disposed at each side of said deflector means.

Claim 8

A fume hood as defined in claim 6, wherein the baffles at one side of said deflector means are aligned with respective baffles at the opposite side thereof, a pair of aligned baffles being disposed substantially in alignment with the respective junctures of adjacent closure member when the latter are in closed positions.

Claim 9

In a fume hood employing laterally slidable closure means for the access opening thereof, the combination of a fume hood housing cooperable with a plurality of movable closure members to form a chamber, with said members forming at least a part of a sidewall of such chamber and movable laterally relative to said housing and one another to provide an opening in such wall by means of which access may be effected to the chamber interior, duct means communicating adjacent end with the chamber interior and at the opposite end exteriorly of the chamber for discharging auxiliary air adjacent the exterior of said closure members, means for discharging auxiliary air into said duct intermediate the ends of the latter, and means responsive to lateral movement of said closure members for operatively varying the amount of auxiliary air discharged from said duct to the hood exterior in response to changes in the relative positions of said closure members, said auxiliary air varying means comprising damper members, defining a part of a wall of such duct, operative to control air flow therethrough, and means for effecting movement of said damper means in response to the movement of said closure members, said duct having an opening therein for the flow of auxiliary air into said duct irrespective of the setting of said auxiliAry air-varying means.

Claim 10

In a fume hood employing laterally slidable closure means for the access opening thereof, the combination of a fume hood housing cooperable with a plurality of movable closure members to form a chamber, with said members forming at least a part of a sidewall of such chamber and movable laterally relative to said housing and one another to provide an opening in such wall by means of which access may be effected to the chamber interior, duct means communicating adjacent end with the chamber interior and at the opposite end exteriorly of the chamber for discharging auxiliary air adjacent the exterior of said closure members, means for discharging auxiliary air into said duct intermediate the ends of the latter, and means responsive to lateral movement of said closure members for operatively varying the amount of auxiliary air discharged from said duct to the hood exterior in response to changes in the relative positions of said closure members, said auxiliary air varying means comprising damper members, defining a part of a wall of such duct, operative to control air flow therethrough, and means for effecting movement of said damper means in response to the movement of said closure members, said duct having an opening therein for the flow of auxiliary air into said duct irrespective of the setting of said auxiliAry air-varying means.

Claim 11

In a fume hood employing laterally slidable closure means for the access opening thereof, the combination of a fume hood housing cooperable with a plurality of movable closure members to form a chamber, with said members forming at least a part of a sidewall of such chamber and movable laterally relative to said housing and one another provide a vertically extending opening in such wall by means of which access may be effected to the chamber interior, means for providing a discharge of auxiliary air laterally along the adjacent exterior of the upper portions of said closure members, and control means cooperable with said first means, responsive to lateral movement of said closure members, for restricting auxiliary air discharge therefrom when said closure members are in closed positions and effecting an auxiliary air discharge therefrom adjacent the upper end of such a vertically extending opening resulting from relative movement of a closure member.

Claim 12

In a fume hood employing laterally slidable closure means for the access opening thereof, the combination of a fume hood housing cooperable with a plurality of movable closure members to form a chamber, with said members forming at least a part of a sidewall of such chamber and movable laterally relative to said housing and one another provide a vertically extending opening in such wall by means of which access may be effected to the chamber interior, means for providing a discharge of auxiliary air laterally along the adjacent exterior of the upper portions of said closure members, and control means cooperable with said first means, responsive to lateral movement of said closure members, for restricting auxiliary air discharge therefrom when said closure members are in closed positions and effecting an auxiliary air discharge therefrom adjacent the upper end of such a vertically extending opening resulting from relative movement of a closure member.

Claim 13

A fume hood as defined in claim 9, wherein said control means is constructed to vary the amount of auxiliary air so discharged in response to changes in the size of such vertically extending opening resulting from changes in the relative positions of said closure members.

Claim 14

In a fume hood employing laterally slidable closure means for the access opening thereof, the combination of a fume hood housing cooperable with a plurality of movable closure members to form a chamber, with said members forming at least a part of a sidewall of such chamber and movable laterally relative to said housing and one another to provide a vertically extending opening in such wall by means of which access may be effected to the chamber interior, duct means extending laterally across such sidewall above said closure members, said duct means communicating adjacent one end with the chamber interior and at the opposite end exteriorly of the chamber for discharging auxiliary air adjacent the exterior of the upper portions of said closure members, means for discharging auxiliary air into said duct means intermediate the ends of the latter, and respective means for each closure member, responsive to lateral movement of the associated closure member, for controlling the discharge of auxiliary air adjacent the upper portion of the associated closure member, and operative to correspondingly vary the amount of auxiliary air so discharged from said duct means to the hood exterior, in response to changes in the relative positions of said closure members, said duct having an opening therein for the flow of auxiliary air into said duct means irrespective of the setting of said auxiliary air-controlling means.

Claim 15

In a fume hood employing laterally slidable closure means for the access opening thereof, the combination of a fume hood housing cooperable with a plurality of movable closure members to form a chamber, with said members forming at least a part of a sidewall of such chamber and movable laterally relative to said housing and one another to provide a vertically extending opening in such wall by means of which access may be effected to the chamber interior, duct means extending laterally across such sidewall above said closure members, said duct means communicating adjacent one end with the chamber interior and at the opposite end exteriorly of the chamber for discharging auxiliary air adjacent the exterior of the upper portions of said closure members, means for discharging auxiliary air into said duct means intermediate the ends of the latter, and respective means for each closure member, responsive to lateral movement of the associated closure member, for controlling the discharge of auxiliary air adjacent the upper portion of the associated closure member, and operative to correspondingly vary the amount of auxiliary air so discharged from said duct means to the hood exterior, in response to changes in the relative positions of said closure members, said duct having an opening therein for the flow of auxiliary air into said duct means irrespective of the setting of said auxiliary air-controlling means.

Claim 16

A fume hood as defined in claim 11, comprising duct means communicating with said first duct means and the interior of said chamber for directing auxiliary air in said first duct means into the chamber interior.