| 摘要 |
The invention relates to a control key, consisting of a fixed casing, a push-button mounted for sliding in the casing and magnetic means for returning the push-button to its rest position. The casing comprises a hollow center part opened towards the top and of which the bottom is at least partly closed off by a wall of predetermined thickness, to form a housing for a permanent magnet. The said push-button is hollow on the inside so as to cap the said center part, and is provided at its lower end with a plate of magnetic material, closing off the hollow inside of the push-button beyond the said wall. The invention finds an application in keyboard installations. |
