| 摘要 |
548,980. Sliding and folding doors. EDUCATIONAL SUPPLY ASSOCIATION, Ltd.,and LEONARD, J. W. July 25, 1941, No. 9485. [Class 65 (i)] A sliding and folding door d is operated by one or more electric motors e mounted on the end posts' a, b and controlled by switches f which are automatically actuated to stop the motor, when the door is nearly fully open, by slidable spring-pressed rods l which engage each other at n and move cams o to depress switch rods g. Specification 512,135 is referred to. |
