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US 5,001,808 AGranted
Shielded castor with spring
OwnerChin-Fu Chunginventor
Life of this patent
Estimating the term…
Abstract
A castor, which can efficiently absorb shock and the ball wheel of which can be alternatively received in or protruding beyond a cup-like shield thereof for positioning or moving. The caster comprises a sleeve which is secured to a hoop on the frame of a baby-walker for receiving a spring and a central shaft which comprises a ball wheel on the bottom. The sleeve comprises a Z-shaped track on its wall surface for the sliding and positioning therein of a lateral guide which is inserted therethrough and secured to the central shaft. A cup-like shield is secured to the bottom end of the sleeve to protect the ball wheel.
Claims3
A castor, including
- a sleeve secured to a circular hoop on the frame of a baby-walker by means of screws, having a Z-shaped track on its wall surface and an inner flange on its bottom end;
- a cup-like shield secured to the bottom end of said sleeve;
- a central shaft comprising a collar on its upper end and being movably fastened in said sleeve with its collar stopped against said inner flange;
- a lateral guide inserted through said Z-shaped track and secured to said central shaft permitting its one end to protrude beyond said sleeve;
- a spring received in said sleeve with its one end stopped against the bottom surface of said circular hoop and its other end stopped against said collar;
- and
- a ball wheel secured to the bottom end of said central shaft by means of an universal knuckle.
4 more elements
Dependencies are inferred from the claim text.