Patent ID: 7735710

Claim:
An apparatus for supporting a substrate, comprising: a chamber body; a support plate disposed in the chamber body and having a first side adapted to support the substrate and a first edge bounding a portion of the first side, the support plate rotationally fixed relative to the chamber body; a first body coupled to the support plate and disposed proximate the first edge and rotatable on a first axis parallel to a plane of the first side of the support plate and first edge of the support plate, the first axis fixed in a stationary position relative to the first edge; and a first pushing member radially coupled to a second body having a second axis and the second body is coupled to the first body with the first pushing member adapted to concurrently urge the substrate in a direction parallel to the first side when the first body rotates, wherein the first pushing member further has a roller rotational axis comprising the second axis of the second body, wherein the second body further comprises: a first flange; a second flange; a center portion coupling the first and second flanges; a first hole formed through the first and second flanges coaxial with the first axis of the first body; and a roller disposed between the first and second flanges, the roller having the second axis oriented parallel to the first axis of the first body, the second axis that rotates about the first axis of the first body.