| 摘要 |
<p>The contrivance being patented results from extreme practicality for the stopping of a door, since it is actuated by the handle of the door itself. By lowering the handle the piston becomes loose and the door can be moved, when the handle is deactivated the door is locked in the desired position. The contrivance consists of three groups of elements A, B, C, located in the thickness of the door. <IMAGE></p> |
