Swivel base structure

• US 6,089,520 A
• Filed: 09/03/1996
• Issued: 07/18/2000
• Est. Priority Date: 09/03/1996
• Status: Expired due to Fees

• Current Assignee: Mag Technology Company Limited
• Original Assignee: Mag Technology Company Limited
• Inventors: Hsu, Tsung Jung, Wu, Wei-Chung
• Primary Examiner(s): Canfield, Robert
• Application Number:
  US08/709,464
• Time in Patent Office: 1,414 Days
• Field of Search: 248/371, 248/919-923, 248/349.1, 248/558
• US Class Current: 248/371
• CPC Class Codes: F16M 11/126 for tilting and panning F16M11/14 takes precedence
• CPC Class Codes: F16M 2200/08 Foot or support base
• CPC Class Codes: Y10S 248/923 Tilting

Abstract

A swivel base includes a stationary bottom support to be placed on for example a desk and a movable tray movably supported on the fixed bottom support to support thereon for example a monitor. The bottom support has a circular wall having an inclined inner face and the movable tray has a concave member corresponding to and slidably supported on the inclined face. A post located at center of a recess defined by the circular wall with an expanded retaining member fixed thereon. An elongated slot is provided on the concave member and has an widened section to receive the penetration of the retaining member for retaining the post within the slot in a movable manner and to allow the movable tray to rotate about the post. A stop block is provided within the recess defined by the circular wall and a corresponding rib is provided on the underside of the concave member to be contactable with the stop block for limiting the rotation of the movable tray about the post. A cantilever type, resilient plate having a side lug formed on a free end thereof is formed on the inclined face to be depressible by the rib. The rib has an L-shaped paw and the side lug of the resilient plate has an inverted L-shaped catch engageable with the L-shaped paw to prevent the movably tray from disengaging from the bottom support.

Claims

1. 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.

2. The swivel base structure as claimed in claim 1, wherein the recess defined by the circular wall comprises a stop block mounted therein to be contactable by the underside rib of the movable tray to limit the rotation of the movable tray about the post.