| 摘要 |
A canopy garage door opener including a mechanism for interconnecting a horizontal, rectilinear reciprocating carriage drive means to a canopy door having a first axis fixed to the door and movable vertically in a guide means and a pair of crank arms pivoted at the top of a door opening and to a horizontal axis fixed with respect to the door. The mechanism includes a lever pivoted to the carriage forming part of a quadrangular link assembly pivoted to the door at one apex and connected by another link to the door from an adjacent apex. Guard means including fixed and movable plates are disposed on both sides of the mechanism to shield it, the movable plates being pivotally connected to the mechanism and being rotated by a cam and follower connection to the fixed plates. |
