Ball bearing assembly

Details Ball bearing assembly Ball bearing assembly

1992-12-18

1994-09-06

Hannon, Thomas R.

Bearings

Linear bearing

Ball bearing

384905, F16C 2904

Patent

active

053442385

ABSTRACT:
The ball bearing assembly has a total stroke range comprising a first portion where a clearance fit is applied and a second range where an interference fit is applied. The interference stroke range is used to, for example, carry a platform where precise alignment is necessary, and deflections or other movement of the platform must be minimized. Use of the ball bearing assembly to carry a platform holding a semiconductor wafer to be probed is illustrated. After each wafer is probed, the ball cage is reset such that any migration of the ball cage is eliminated so that the clearance and interference stroke ranges return to predetermined values. Further provided are means for rotationally resetting the ball cage, providing for even wear over the entire surfaces of the shaft and housing in their working zones to increase the useful lifetime of the assembly. Also provided are means for maintaining a predetermined interference fit over an extended temperature range, even where the shaft and housing operate at different temperatures.

REFERENCES:
patent: 3688592 (1972-09-01), Kopczynski
patent: 4190870 (1980-02-01), Avina et al.
patent: 4523863 (1985-06-01), Okoshi
patent: 4582369 (1986-04-01), Itoh
patent: 4717265 (1988-01-01), Shioda et al.
patent: 4722617 (1988-02-01), Stella et al.
patent: 4742883 (1988-05-01), Duffy
patent: 4907897 (1990-03-01), Shirotori
patent: 5051002 (1991-09-01), Hanaway
patent: 5158373 (1992-10-01), Hanaway

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