Browse Prior Art Database

Uni-Adjustable Double Joint

IP.com Disclosure Number: IPCOM000042195D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Beurer, FC: AUTHOR

Abstract

The improvement allows the tolerances on parallel or perpendicular related machined surfaces 10 to be relaxed. The vertical axis 12, such as the Z axis of a robot, can be adjusted to absolute perpendicularity to a given horizontal plane. In connection with robots the uni-adjustable double joint allows adjusting to obtain absolute perpendicularity of the vertical joint axis 12 to the horizontal joint axis 14, which in turn is parallel to and moves laterally in an established horizontal plane. The joint consists of a plastic shim stock sheet 16 sandwiched between the double-joint machined surfaces 10 to maintain a basic parallel plane relationship while under slight preload at three adjustable points 18, as shown in Figs. 1 and 2.

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Uni-Adjustable Double Joint

The improvement allows the tolerances on parallel or perpendicular related machined surfaces 10 to be relaxed. The vertical axis 12, such as the Z axis of a robot, can be adjusted to absolute perpendicularity to a given horizontal plane. In connection with robots the uni-adjustable double joint allows adjusting to obtain absolute perpendicularity of the vertical joint axis 12 to the horizontal joint axis 14, which in turn is parallel to and moves laterally in an established horizontal plane. The joint consists of a plastic shim stock sheet 16 sandwiched between the double-joint machined surfaces 10 to maintain a basic parallel plane relationship while under slight preload at three adjustable points 18, as shown in Figs. 1 and 2. The plastic shim stock 16 is retained between the horizontal and vertical joints with a bolt 20, nut 22, cotter pin 24 and spherical seated washer 26 located so that the focal point 28 of the seat of the spherical washer 26 intersects the center line 12 of the axis of the vertical joint and the bolt center line 30, perpendicular to the center line 14 of the joint of the horizontal axis, in the normal position. Three jacking screws 32 are adjusted against the lugs to set the center line axis of the vertical joint to obtain absolute perpendicularity to an established horizontal plane, and still maintain proper rigidity.

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