Patent ID: 6089520
Filing Date: 2000-07-18
Classification: F16M,Y10S

Abstract:
A swivel base structure comprising a bottom support adapted to be placed on a surface and a movable tray movably supported on the bottom support and adapted to support thereon an article to be swivelled, the bottom support comprising a raised circular wall defining therein a recess with a post extending therefrom at a center of the recess defined by the circular wall, the circular wall having a ring-like inner inclined face which is concave to be corresponding to a ring segment of a sphere having a given radius and a substantially vertical face connecting between the inclined face and bottom of the recess, the post having an expanded retaining member formed thereon, a slit being formed on the inclined face to define a resilient, cantilever type member which has a free end having a side lug extending therefrom toward the post and partially into the recess, the side lug being elastically deformably moveable relative to the inclined face, the movable tray comprising a concave member corresponding to a portion of a sphere having the substantially same radius of the sphere defining the inclined face of the wall to be supported on the inclined face of the wall, the concave member having an elongated slot formed thereon with a width smaller than the retaining member but larger than the post, the slot having a widened section having a width sufficient to receive the retaining member therethrough to allow the post to move along the slot and allow the movable tray to rotate about the post, a rib being provided on an underside of the concave section of the movable tray so that when the movable tray is supported on the inclined face of the bottom support, the rib elastically deforms the side lug of the resilient member downward to define a passage for allowing the rib to slide over the resilient member and into the recess, the side lug of the resilient member having formed thereon an inverted L-shaped catch and the rib of the movable tray having an L-shaped paw corresponding to and engageable by the inverted L-shaped catch to prevent the movable tray from disengaging from the bottom support.