Rebecca F Woodruff

US Patent:

43915973, Jul 5, 1983

Filed:

Jul 21, 1982

Appl. No.:

6/400528

Inventors:

Alireza Piramoon - Santa Clara CA
Rebecca J. Woodruff - San Mateo CA

Assignee:

Beckman Instruments, Inc. - Fullerton CA

International Classification:

B04B 912

US Classification:

494 20

Abstract:

A centrifuge rotor is provided which has a circumferential wall and a plurality of spaced arms which radiate outward from the center to the circumferential wall. A plurality of buckets are mounted on the rotor, one between each arm. Each bucket has two outwardly extending pivot pins situated on a common axis. A plurality of hangers are mounted in the spaced arms of the rotor. Each hanger comprises an elongated housing containing an opening which is transverse to the longitudinal dimension of the housing for receiving the pivot pin of a bucket. A longitudinal bore intersects the opening and contains a spring for exerting a clamping force on the pivot pin when the rotor is stopped. This prevents the bucket from rocking when being loaded or unloaded, but does not prevent the bucket from pivoting to a horizontal position when the rotor is rotating, nor does it prevent the bucket from resuming a vertical position when the rotor is stopped. The opening in the hanger for receiving the pivot pin of a bucket is intersected by an elongated longitudinal slot. The pivot pin is movable in this slot when the centrifugal force acting on both the bucket and the pin overcomes the clamping force of the spring.

US Patent:

43893740, Jun 21, 1983

Filed:

Jun 29, 1981

Appl. No.:

6/278772

Inventors:

John H. Sutton - Belmont CA
Rebecca J. Woodruff - Fremont CA

Assignee:

Beckman Instruments, Inc. - Fullerton CA

International Classification:

B01L 906

US Classification:

422104

Abstract:

A centrifuge tube holder capable of being manually assembled and disassembled without separate tooling to provide not only ease of cleaning, but also interchangeability of parts to accommodate various sized centrifuge tubes. The tube holder arrangement provides proper support with a minimum of parts to create a lighter weight assembly for use in a centrifuge rotor.