| 摘要 |
FIELD: mechanics.SUBSTANCE: trackball contains in the housing the kinematically connected among themselves driving ball and two mutually perpendicular driving rollers on axes of which the code wheels and the related coordinate converters are fixed, and the threaded hole is made in which the threaded bushing with a corrugated fillet in the upper part and a conic hole for the driving ball supported by kinematically connected two driving and one thrust rollers is installed. In the zone of contact of the driving ball with the conic surface of the hole of the threaded bushing the groove is made which fixes the circular gasket from elastic material. On an external surface of the housing the marking is made which indicates the positions of the threaded bushing at which the driving ball is completely free for rotation for movement of the cursor and at which the bushing fixes the ball to provide splash proofing.EFFECT: decrease of mechanical impact on structural elements.4 cl, 3 dwg |
