Importance

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Abstract

A rotary support device comprising an under ring including a horizontal portion and a peripheral wall, the wall projecting upward from the inner periphery of the horizontal portion and being inclined either outward or inward, the wall being formed with a guide groove in a peripheral surface thereof, and an upper ring including a horizontal portion and a peripheral wall, the upper ring wall projecting downward from the inner periphery of the horizontal portion and being inclined along the inclined under ring wall, the upper ring wall being formed with a guide groove in a peripheral surface thereof. The two rings are fitted to each other with a row of balls rollably fitted in their respective guide grooves. The grooved wall portion of each ring has a side edge partially covering the balls from above or below in engagement therewith. The two rings are engaged with each other inseparably and rotatably by the balls. The device is assembled by placing a multiplicity of balls in an annular arrangement into the guide groove of one of the under and upper rings, arranging the two rings as opposed to each other concentrically with the balls interposed therebetween and prevented from falling off as by grease, and pressing the rings against each other to elastically deform the ring walls and thereby fit the balls into the guide grooves of the rings.

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First Claim