Patent ID: 8347451

Claim:
A free-of-bearing rotational positioning device for a dewatering basket of a non-treading type wringer bucket, comprising: a) a bucket body having an opening at the top thereof, a projecting seat being extended from the bottom of the bucket body toward inside; b) a support shaft made of metal material, the lower portion of the support shaft being covered and secured by the projecting seat, the upper portion thereof jutting out of the top of the projecting seat to create a connection part, a recessed part being formed at the center of the connection part; c) a positioning element made of elastic/flexible material, the main body of the positioning element having a conic part at the top thereof, the conic part being tapered upward, the center of the positioning element having a shaft hole with an internal diameter corresponding to the external diameter of the recessed part such that the positioning element fits into the recessed part of the support shaft, a positioning surface being formed at the bottom of the conic part and extended outward from the periphery of the support shaft; and d) a dewatering basket formed by a plastic injection molding process and having a plurality of dewatering holes at the periphery and the bottom thereof, the dewatering basket further having a driven seat at the center of the bottom thereof, wherein, during the formation of the driven seat, the center of the bottom of the driven seat encloses a shaft holder with an opening directed downward and made of non-metal material, and the shaft holder consists of a lower sleeve and an upper sleeve engaging into the lower sleeve, and an engagement groove having a larger diameter is formed within the central portion of the shaft holder, and an end stop is positioned within the top of the upper sleeve, whereby the driven seat tends to slip from top to bottom over the connection part of the support shaft, and after the lower sleeve passes through positioning element in a compression manner, the positioning surface of the positioning element is stretched into the engagement groove when returning to its original shape; in this way, the dewatering basket can be protected from loosening from the support shaft when rotated thereon; moreover, the end stop of the upper sleeve lies against the top portion of the support shaft, thus creating a rotating center; thus, the whole contact point of the dewatering basket is concentrated at the rotating center, thereby reducing the frictional resistance between the shaft holder and the support shaft and therefore permitting a smooth rotation.