Cutlery
Patent
1981-02-11
1983-10-11
Hall, James R.
Cutlery
264 71, 264109, 264126, 308201, 291484C, F16C 3344, B28B 108
Patent
active
044088078
ABSTRACT:
Apparatus and method for direct molding of porous retainers with unobstructed pores for proper lubricant dispensing for use in instrument ball bearings. A method for forming porous ball bearing retainers includes the steps of filling a complex mold with a prescribed quantity of polyamide-imide powder, compressing the powder at high temperatures, and curing the compressed powder for a specified time at high temperatures. A mold for producing such compression molded porous retainers includes a housing having a centrally disposed bore extending longitudinally therethrough. Two plungers are inserted into the bore, one from either end thereof. One of the plungers is spring biased and the inner termination of both plungers are spaced a predetermined distance from one another within the bore. A mandrel is inserted into the bore from one end and passes within both plungers. In this fashion, the inner terminations of the plungers define the top and bottom of the retainer mold cavity. The outer wall of the mandrel defines the inner annular surface of the mold cavity, while the housing bore wall defines the outer annular wall of the mold cavity. Pins project radially inwardly through holes in the housing and mate with holes in the mandrel passing through the mold cavity midway between the cavity top and bottom to define the ball pockets of the retainer mold cavity.
REFERENCES:
patent: 2695425 (1954-11-01), Stott
patent: 3027626 (1962-04-01), Murphy
patent: 3344213 (1967-09-01), Vinson
patent: 3644608 (1972-02-01), Valentine
Hall James R.
The Charles Stark Draper Laboratory Inc.
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