| 摘要 |
A retractable work station suitable for use with a computer keyboard has a parallel swing-link suspension for selectively moving a working platform surface from a fully retracted position, to an advanced working position, while maintaining unchanged the inclination of the platform surface. The apparatus is equipped with a brake for immobilizing the linkage in any desired intermediate position. The platform is adjustably secured to a moveable frame portion of the apparatus so that the inclination of the work platform can be selectively adjusted. One embodiment incorporates tension springs to urge the platform towards either one or the other of its bi-stable positions i.e. fully retracted or fully extended. An inverted embodiment of the apparatus maintains itself in a selected one of its two bi-stable positions without the need for springs. The shape of the respective links of the suspension assures the maintenance of an adequate free space over the platform when retracted, for storage of a keyboard apparatus thereon. |
