Patent Number: 6,945,867

Title: Movable grating control

Abstract: A grating assembly drive means is connected to control the movement of themovable grating between OPEN and CLOSED positions relative to a fixedgrating. The drive means moves the movable grating through yieldableconnection when moving toward CLOSED position, whereby when such movementis blocked by a foreign object the movable grating stops without damagingthe object or the drive. On the other hand movement by the drive meanstoward OPEN position is direct after removal of any slack caused by aprevious yielding.

Inventors: Park; Chan-Woo (Thornhill, ON, CA)

Assignee:

International Classification:

Expiration Date: 09/20/2013