Browse Prior Art Database

Centering Fixture

IP.com Disclosure Number: IPCOM000091186D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Wilke, MA: AUTHOR

Abstract

Centering device 10 includes three eccentric cams 12 carried on respective shafts 14 as seen in the front at A. As viewed from the rear at B, each shaft 14 carries a timing pulley 16. These are interconnected by timing belt 18 to cause cams 12 to rotate in unison upon actuation of lever 17 in the direction of arrow 20 away from stop 21 and against the biasing force of spring 19. Cams 12 confine a retained circular object concentrically within the cylinder defined by the axes of shafts 14. By biasing cams 12 in one rotational direction, such serve to lock the retained object in position. Device 10 finds particular utility in centering large objects.

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Centering Fixture

Centering device 10 includes three eccentric cams 12 carried on respective shafts 14 as seen in the front at A. As viewed from the rear at B, each shaft 14 carries a timing pulley 16. These are interconnected by timing belt 18 to cause cams 12 to rotate in unison upon actuation of lever 17 in the direction of arrow 20 away from stop 21 and against the biasing force of spring 19. Cams 12 confine a retained circular object concentrically within the cylinder defined by the axes of shafts 14. By biasing cams 12 in one rotational direction, such serve to lock the retained object in position. Device 10 finds particular utility in centering large objects.

To retain a specific part, cams 12 are constructed to define a cylinder equivalent to the minimum tolerance past outside diameter at the maximum radial inward projection and to define a cylinder equivalent to the maximum tolerance part outside diameter when rotated 180 degrees to the minimum radial inward projection. The normal small part tolerance results in very accurate centering without the use of precision fixture components. In this condition, any cylindrical part within the range of part tolerance can be received and retained while the maximum locking force is generated.

If a part retained by device 10, as viewed at A, is worked upon by a tool rotating counterclockwise, the locking force is increased as the part is retained. The holding power of device 10 can also be enhanced by adding a slight...