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US 4,399,741 AGranted
Method of controlling room air flow into a fume hood
AssigneeHamilton Industries, Inc.
InventorJon A. Zboralski
Life of this patent
Estimating the term…
Abstract
A method of controlling room air flow into a horizontal sash type laboratory fume hood. The method includes laterally moving a damper across a room air vent by means of horizontal motion of the sash so that the vent opens and closes in an inverse manner to the sash.
Claims3
A method of controlling room air flow into a fume hood having a horizontally slidable sash and a room air vent comprising the steps of:
- (a) horizontally sliding the sash to change a sash passage into the hood;
- and
- (b) transmitting at least a portion of the sash's sliding movements to the left and at least a portion of the sash's sliding movements to the right into lateral movements of a damper moving the damper across the vent to change a vent passage in an inverse manner to the change in a sash passage;
- wherein the method includes progressively opening and closing the sash while progressively closing and opening the damper, and further includes moving the sash a given horizontal distance before moving the damper, whereby the total travel of the sash is greater than the damper travel.
1 more element
Dependencies are inferred from the claim text.