HERBERT B SINGER
Engineering in Randolph, MA
License number
Massachusetts 23940
Issued Date
Jan 29, 1971
Expiration Date
Jun 30, 2006
Type
Mechanical Engineer
Address
Address
Randolph, MA 02368
Professional information
Compression Molding Of Porous Retainers
US Patent:
4408807, Oct 11, 1983
Filed:
Feb 11, 1981
Appl. No.:
6/233396
Inventors:
Herbert B. Singer - Randolph MA
Assignee:
The Charles Stark Draper Laboratory, Inc. - Cambridge MA
International Classification:
F16C 3344, B28B 108
US Classification:
308187
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.