TABLE TOP, NOISE SUPPRESSED CENTRIFUGE

• US 3,804,324 A
• Filed: 10/06/1972
• Issued: 04/16/1974
• Est. Priority Date: 06/27/1972
• Status: Expired due to Term

• Current Assignee: Hans Stallmann, Hartmut Sinn
• Original Assignee: Hans Stallmann, Hartmut Sinn
• Inventors: Stallmann, Hans, Sinn, Hartmut
• Primary Examiner(s): Krizmanich, George H.
• Application Number:
  US05/295,559
• Time in Patent Office: 557 Days
• Field of Search: 233/1R,1B,1C,26,23R,24,113 312/352 220/71,83 248/15,18,20
• US Class Current: 494/14
• CPC Class Codes: B04B 15/02 for cooling, heating, or heat insulating
• CPC Class Codes: B04B 5/0421 pivotably mounted
• CPC Class Codes: B04B 7/02 Casings; Lids shock absorbers, vibration dampers F16F

Abstract

A centrifuging chamber, with a motor therebeneath to drive the centrifuging elements is formed interiorly of a housing, the housing sidewalls, internal structural features of the housing, and support elements for the motor being of structurally hard foamed, or cured foam material, preferably polyurethane cured foam. Where necessary, a metal mesh or grid preferably steel, can be embedded in the housing structure, by foaming the material around the steel reinforcement.

Claims

1. Centrifuge having a housing including sidewalls, a bottom wall, and a removable cover for the housing and comprising also;

means defining a centrifuging chamber (C) within the housing;

a centrifuging rotor (15) rotatably mounted in the chamber; and

motor means (10) mounted in the housing to drive the rotor in the chamber;

wherein the housing sidewalls, the bottom wall, and the cover comprise hard structural plastic foam material of a sandwich structure comprising outer skins of closed cell structure and an intermediate core of at least partly open cell, porous structure, said outer skins being of substantially higher density than said intermediate core.

2. Centrifuge according to claim 1, whErein the hard foam material comprises hardened polyurethane foam.

3. Centrifuge according to claim 1, wherein the sidewalls of the housing and the means defining the centrifuging chamber are a unitary foam molding of hard structural plastic foam material.

4. Centrifuge according to claim 1, wherein the housing is formed with internal projections forming attachment means (11, 21) for the motor, said attachment means being part of a unitary molding comprising said housing and said attachment means (11, 21).

5. Centrifuge according to claim 4, wherein the centrifuge comprises electric switching and circuit elements (7) and the housing is formed with a mounting means for said elements, said mounting means being part of the unitary molding comprising said housing, said attachment means and said mounting means.

6. Centrifuge according to claim 1, wherein said sidewalls have gripping depressions (5).

7. Centrifuge according to claim 1, comprising an internal portion located adjacent the lower portion of the sidewalls and the bottom wall and defining a separate chamber (22), said chamber being open (19) interiorly of the centrifuge to permit access from the chamber to the motor, said chamber permitting storing of electrical connecting cables for the centrifuge motor, or of accessories, within the housing of the centrifuge.

8. Centrifuge according to claim 1, comprising reinforcement means (33) embedded in at least one of the sidewalls and located at least in the region of the centrifuging chamber (C).

9. Centrifuge according to claim 8, wherein the reinforcing means comprises a metal insert.

10. Centrifuge according to claim 9, wherein the metal insert is a steel insert.

11. Centrifuge according to claim 9, wherein the metal insert is perforated or grid or mesh-like.

12. Centrifuge according to claim 1, wherein the cover (3) is formed with an elongated opening (8) to permit removal of the cover and provide for ventilation of the centrifuging chamber (C) and an air deflection plate (23) covering said opening is mounted at the side of the cover facing the chamber (C).

13. Centrifuge according to claim 12, wherein the air deflection plate (23) is shaped to have a small distance from the cover in a central region (24) thereof;

a greater distance from the cover at side regions (25) thereof; and

little distance from the cover at marginal regions (26) there of so that the air deflection plate and the cover will conjointly define a ring-shaped space (28), the opening (8) within the cover being located in the region of the ring-shaped space (28).

14. Centrifuge according to claim 13, wherein the cover (3) has a projecting edge portion (27) overlapping the marginal regions (26) of the air deflection plate (23).

15. Centrifuge according to claim 13, wherein the cover is plate-like to form a cover plate, and internally projecting ribs (29) are located in the ring-shaped space (28) extending from at least one of said plates (3, 23) towards the other plate to subdivide the ring-shaped space in a plurality of noise dampening chambers.

16. Centrifuge according to claim 13, wherein the air deflection plate comprises a thermoplastic extrusion.

17. Centrifuge according to claim 1, wherein said skins of said sandwich structure have a thickness of 1 millimeter or more.

18. Centrifuge according to claim 1, wherein said hard structural plastic foam material has an overall density in the range between 400 and 1,200 kg/m2.

19. Centrifuge according to claim 1, wherein said hard structural plastic foam material has an overall density within the range between 500 and 800 kg/m2.

20. Centrifuge according to claim 1, wherein said hard structural plastic foam material has a closed cell skin portion having a thickness of about one-tenth of the overall thickness of the sidewalls of said housing and wherein said wall thickness is within the range of 1 to several centimeters.