Patent ID: 11927038
Assignee: SHANG TIAN ALUMINUM CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 6:
7. A method of operating the locking device as claimed in claim 1, wherein the sash is slidable along a horizontal direction within the frame between a third position and a fourth position; the method comprises:
turning on the switch to control the block to move from the first position to the second position and to allow the block to move in a direction away from the mounting groove to protrude out of the vertical surface of the sash; simultaneously, the block drives the linkage member to disengage from the frame;
holding and pushing the block in the horizontal direction to slide the sash between the third position and the fourth position;
holding and pushing the block in the horizontal direction to slide the sash to the third position;
controlling the block to move the block from the second position to the first position and to allow the block to return back to the mounting groove and to move the linkage member to a position where the linkage member is engaged with the frame, thereby locking the sash to the frame.