Rotatable reconfigurable table for holding and supporting contoured workpieces

• US 5,121,907 A
• Filed: 06/21/1991
• Issued: 06/16/1992
• Est. Priority Date: 06/21/1991
• Status: Expired due to Fees

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Engwall, Dwight L.
• Primary Examiner(s): Watson, Robert C.
• Application Number:
  US07/718,634
• Time in Patent Office: 361 Days
• Field of Search: 269/266, 269/71, 269/130-132, 269/296, 269/46, 269/21, 254/134
• US Class Current: 269/21
• CPC Class Codes: B23Q 1/035 with an array of longitudinally movable rods defining a reconfigurable support surface
• CPC Class Codes: B25B 11/00 Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders for holding or positioning work for welding, soldering, or cutting by applying heat locally B23K37/04; specially adapted to machine tools B23Q3/00

Abstract

A reconfiguration table, for holding and supporting a contoured workpiece while work is performed thereon comprising a frame defining a perimeter and a plane; a plurality of support elements disposed in spaced array within the frame perimeter, each element having an end and being independently translatable in a direction substantially perpendicular to the plane, the ends of the elements cooperating to define a support surface for the workpiece; clamp members, supported by the frame, for selectively locking the elements in position to define the support surface; attaching members, supported by the frame independently of the support elements, for holding the workpiece on the support surface; and a gear reducer and motor for rotating the frame with the workpiece supported thereon about an axis parallel to the plane of the frame.

Claims

1. A reconfiguration table for holding and supporting a contoured workpiece while work is performed thereon, the table comprising:

a frame defining a perimeter and a plane;

a plurality of support elements disposed in spaced array within the frame perimeter, each element having an end and being independently translatable in a direction substantially perpendicular to the plane, the ends of the elements cooperating to define a support surface for the workpiece, wherein translation of each support element relative to the plane of the frame is effected solely by gravity;

means, supported by the frame, for selectively locking the elements in position to define the support surface;

means, supported by the frame independently of the support elements, for holding the workpiece on the support surface; and

means for rotating the frame with the workpiece supported thereon about an axis parallel to the plane of the frame.

4. The reconfiguration table of claim 1 wherein the locking means comprises a plurality of locking members for selectively engaging and disengaging respective support elements.

5. The reconfiguration table of claim 4 further comprising a pneumatic cylinder connecting locking members.

6. The reconfiguration table of claim 1 wherein the holding means comprises a vacuum cup supported by the frame for selective movement into airtight engagement with a workpiece disposed in contact with the support surface and a low pressure source in fluid communication with the vacuum cup.

7. The reconfiguration table of claim 1 wherein the holding means comprises a vacuum cup supported by the frame for selective movement into airtight engagement with a workpiece disposed in contact with the support surface and a low pressure source in fluid communication with the vacuum cup.

8. The reconfiguration table of claim 1 wherein the holding means comprises means for releasably attaching the workpiece to the frame at predetermined positions on the periphery of the workpiece.

2. A reconfiguration table for holding and supporting a contoured workpiece while work is performed thereon, the table comprising:

a frame defining a perimeter and a plane;

a plurality of support elements disposed in spaced array within the frame perimeter, each element having an end and being independently translatable in a direction substantially perpendicular to the plane, the ends of the elements cooperating to define a support surface for the workpiece;

means, supported by the frame, for selectively locking the elements in position to define the support surface;

means, supported by the frame independently of the support elements, for holding the workpiece on the support surface;

means for rotating the frame with the workpiece supported thereon about an axis parallel to the plane of the frame; and

detachable members for biasing each support element in a common direction relative to the plane of the frame.

3. The reconfiguration table of claim 2 wherein the detachable members for biasing are tensioned shock cords.

9. The reconfiguration table of claim 2 wherein the holding means comprises means for releasably attaching the workpiece to the frame at predetermined positions on the periphery of the workpiece.

15. The reconfiguration table of claim 2 wherein the detachable members for biasing are tensioned shock cords.

16. The reconfiguration table of claim 15 further comprising a pneumatic cylinder connecting locking members.

17. The reconfiguration table of claim 2 wherein the holding means comprises a vacuum cup supported by the frame for selective movement into airtight engagement with a workpiece disposed in contact with the support surface and a low pressure source in fluid communication with the vacuum cup.

10. A method for holding and supporting a contoured workpiece having a surface on which work is to be performed and an opposed non-work surface, the method comprising the steps of:

disposing the non-work surface of the workpiece in aligned relation with a spaced array of individual support elements releasably fixed within a frame, wherein the workpiece is below the frame, each element having an end and being disposed for independent translation in a direction perpendicular to a plane defined by the frame, the ends of the elements cooperating to define a support surface when released;

releasing the support elements for translation by gravity to contact positions wherein the ends thereof contact the other surface of the workpiece and self-adjust to define a support surface conforming to the contour of the non-work surface;

attaching the workpiece to the frame while in contact with the support surface;

locking the support elements in position to define the support surface; and

rotating the frame with the workpiece attached thereto to a desired position for working on a surface thereof.

11. The method of claim 10 wherein the attaching step is carried out by placing a vacuum cup moveably supported by the frame into contact with the non-work surface of the workpiece and conducting low pressure to the vacuum cup to attach the workpiece to the frame.

12. A method for holding and supporting a contoured workpiece having a surface on which work is to be performed and an opposed non-work surface, the method comprising the steps of:

disposing the non-work surface of the workpiece in aligned relation with a spaced array of individual support elements releasably fixed within a frame, each element having an end and being disposed for independent translation in a direction perpendicular to a plane defined by the frame, the ends of the elements cooperating to define a support surface when released and the support elements being biased in a common direction, wherein the disposing step is carried out by placing the non-work surface of the workpiece into contact with the ends;

releasing the support elements for translation to contact positions wherein the ends thereof contact the non-work surface of the workpiece and self-adjust to define a support surface conforming to the contour of the non-work surface, and wherein the releasing step permits the weight of the workpiece to translate the elements against the bias to define the support surface;

attaching the workpiece to the frame while in contact with the support surface;

locking the support elements in position to define the support surface; and

rotating the frame with the workpiece attached thereto to a desired position for working on a surface thereof.

13. The method of claim 12 wherein the attaching step comprises securing the periphery of the workpiece to the periphery of the frame.

14. The method of claim 12 wherein the support elements are biased with tensioned shock cords.