ADJUSTABLE TENSIONING DEVICE FOR CIRCULAR SCREENS

• US 3,776,382 A
• Filed: 04/30/1973
• Issued: 12/04/1973
• Est. Priority Date: 04/30/1973
• Status: Expired due to Term

• Current Assignee: BLAW KNOX Company
• Original Assignee: Edward S. Wright, John W. Angstadt, Otto C. Krolopp
• Inventors: Wright, Edward S., Angstadt, John W., Krolopp, Otto C.
• Primary Examiner(s): Lutter, Frank W.
• Assistant Examiner(s): Hill, Ralph J.
• Application Number:
  US05/355,916
• Time in Patent Office: 218 Days
• Field of Search: 209/279,280,350,351,403,404,405,408,412,413,361 108/127.1,128.1,415.1 140/109
• US Class Current: 209/403
• CPC Class Codes: B07B 1/48 Stretching devices for screens
• CPC Class Codes: B07B 1/49 stretching more than one screen or screen section by the same or different stretching means

Abstract

There is disclosed a novel circular screen frame assembly comprised of a screen, a support ring and an annular clamping and tensioning assembly. In one embodiment of the present invention, the annular clamping and tensioning assembly is comprised of a clamping ring and a tensioning ring. The support ring is adapted to be positioned and held within the housing of the sifter assembly. The clamping ring circumferentially secures the screen to the tensioning ring with the resulting annular clamping and tensioning assembly being positioned about the support ring with adjustable fixing means. Tensioning of the circular screen is effected either by the horizontal or vertical displacement of the annular clamping and assembly with reference to the support ring about a plurality of points about the rings.

Claims

1. A circular screen frame assembly for a circular screening assembly which comprises:

a support ring means;

a circular screen means; and

an annular clamping and tensioning means for positioning and adjustably tensioning said screen means about said support ring means.

2. The assembly as defined in claim 1 wherein said annular clamping and tensioning means is comprised of a clamping ring means and a tensioning ring means.

3. The assembly as defined in claim 2 wherein said screen means is affixed between said clamping ring means and said tensioning ring means by a plurality threaded fasteners means and wherein said tensioning ring means is moved relative to said support ring to effect tensioning of said screen member.

4. The assembly as defined in claim 3 wherein said support ring includes an upwardly extending leg member means over which said screen means is disposed.

5. The assembly as defined in claim 4 wherein selected portions of said clamping ring means and said tensioning ring means are moved in a plane normal to the screen means by said plurality of threaded fasteners disposed about the periphery of said ring means.

6. The assembly as defined in claim 4 wherein said tensioning ring means is an inflatable tube means. 7. The assembly as defined in claim 2 wherein the upper surface of said ring means is above the lower portion of an oversized particulate outlet conduit.

8. The assembly as defined in claim 2 wherein a horizontal leg means of said support ring is positioned between cylindrical side walls of said screening assembly rigidly affixed to one another by a removable clamping means.

9. The assembly as defined in claim 8 wherein a gasket means is provided between the extended portion of said horizontal leg means and said removable clamping means.

10. The assembly as defined in claim 2 wherein said screen means is affixed to a leg means of said support ring means.

11. The assembly as defined in claim 10 wherein said leg means of said support ring means is vertical leg means thereof and is affixed by a plurality of threaded fastener means.

12. The assembly as defined in claim 11 wherein said tensioning ring means is movable in a plane normal to said screen means.

13. The assembly as defined in claim 12 wherein said tensioning ring means is movably disposed with respect to said support ring in a plane parallel to said vertical leg means of said support ring.

14. The assembly as defined in claim 10 wherein said leg means of said support ring means is a horizontal leg means thereof and is affixed by a plurality of threaded fastener means.

15. The assembly as defined in claim 14 wherein said clamping ring means is disposed between said horizontal leg means of said support ring means and a vertically extending leg means therefor and said clamping ring means is radically adjustable.