| 摘要 |
<p>A pull switch for operating installations has a box and a cable (2, 3) which is connected to a plate (6, 7) which moves in a sliding manner, is approximately flat and is fitted in the box. The plate has an opening (10) through which a first cam (11) passes. The first cam is fitted on a spring-loaded camshaft (13) which can move in rotation and has a longitudinal axis which is approximately at right angles to the plane of the plate. Two microswitches are fitted in the housing which interact with a second cam which is fitted on the camshaft. One microswitch is connected to a circuit for supplying power or current to the operating installation. The other microswitch is connected to a signalling circuit. A manual control device is fitted on the camshaft, outside the box. The design is implemented in such a manner that, when the cable is pulled, the flat plate slides and the edges of the opening engage with the first cam and rotate the camshaft, or the camshaft is rotated on rotation of the manual control device, the second cam [lacuna] from a first position in which the supply switch interrupts the power supply, and the operating installation is switched off. Furthermore, the design is implemented in such a manner that the second cam operates the microswitch which is used for signalling when the manual control device is rotated such that the second cam is rotated beyond the first or second position. <IMAGE></p> |
