Crown cage for ball bearing and dental hand piece including the

Details Crown cage for ball bearing and dental hand piece including the Crown cage for ball bearing and dental hand piece including the

1998-07-06

1999-08-24

Lewis, Ralph A.

Dentistry

Apparatus

Having motor or means to transmit motion from motor to tool

384523, F16C 3344

Patent

active

059417048

ABSTRACT:
A crown cage is applied to a ball bearing for high-speed rotation for a dental hand piece or the like. The cage has a cylinder formed by injection molding of a thermoplastic resin, and pockets for holding balls that are formed at a predetermined circumferential pitch in the cylinder. A first recess including a gate cutting trace at the time of molding, and second recesses for correcting rotational imbalance of the cylinder caused by the first recess, are formed in the cylinder. The recesses have almost the same shape, and are arranged at a predetermined circumferential pitch.

REFERENCES:
patent: 1650853 (1927-11-01), Rouanet
patent: 3918778 (1975-11-01), Jacobson et al.
patent: 4322879 (1982-04-01), Warchol
patent: 5199799 (1993-04-01), Masuda et al.
patent: 5575570 (1996-11-01), Uchiyama et al.

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