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An apparatus which includes a swivel base formed of a first plate and a second plate. The first and second plates each have a central aperture which is defined by a hook-shaped section of the second plate which extends over an interior edge of the first plate defining the first plate\s central apert

An apparatus which includes a swivel base formed of a first plate and a second plate. The first and second plates each have a central aperture which is defined by a hook-shaped section of the second plate which extends over an interior edge of the first plate defining the first plate\s central aperture. The hook-shaped section is preferably circumferentially continuous and fixes the first and second plates together while allowing for sliding engagement between the first and second plates. Bearing members, such as circumferentially spaced ball bearings are provided externally to the hook section and between the plates to facilitate sliding and load distribution. One of the plates includes hollow reception ports for holding the bearing circumferentially in place with respect to that plate while the opposite plate has a continuous riding ring in which the bearings are free to rotate. Each plate has an interior and exterior, preferably horizontal, plate section, and an intermediate section sloping between the adjacent, integral edges of the plate\s interior and exterior sections. One manner of assembling the swivel base is described as well as an assembly including two structures to which the exterior sections of the plates are secured.

대표청구항 ▼

A swivel base, comprising: a first plate having an external peripheral edge and an internal circular edge; and a second plate having an external peripheral edge and a hook-shaped internal section defining an opening in said second plate, which hook shaped internal section includes a first component

A swivel base, comprising: a first plate having an external peripheral edge and an internal circular edge; and a second plate having an external peripheral edge and a hook-shaped internal section defining an opening in said second plate, which hook shaped internal section includes a first component in contact with a first side of said first plate, a second, intermediate component extending across said internal circular edge, and a third component in contact with a second side of said first plate, the internal circular edge of said first plate being slideable within said hook-shaped internal section, and said hook shaped component engaging said first plate so as to prevent separation of said first plate and second plate in a direction along a central axis of a hole defined by the internal circular edge for a 360°range of rotation positions assumable by said plates with respect to each other.