Supporting and lifting device for substrates in vacuum
A pin assembly for lifting and supporting substrates according to the invention comprises a roller glide for a lift pin with rollers reducing the friction of the vertical pin movement, a ball bearing sole plate with elastic suspension for re-centering the sole plate after one coating cycle and a ball-bearing pin head that lowers the friction between the pin and the substrate and minimizes lateral forces that the substrate can apply on the pin.
1 . Pin assembly for lifting and supporting substrates comprising:
A lift pin ( 1 ) having a top and a bottom end;
the top end being construed to receive and support a substrate ( 4 );
the bottom end being construed to be actuated by an elevator system ( 3 a );
the lift pin being movably sustained by a guide,
wherein said guide comprises a roller glide to reduce the friction of the pin movement in a vertical axis.
2 . Pin assembly according to claim 1 , wherein the roller glide comprises six rollers arranged in a bushing.
3 . Pin assembly according to claim 1 , wherein the roller glide is being mounted on the reactor bottom.
4 . Pin assembly according to claim 1 , wherein the roller glide comprises rollers made from material allowing low wear and low friction.
5 . Pin assembly according to claim 2 , wherein the roller glide and the bushing are made of the same material.
6 . Pin assembly according to claim 1 , wherein the bottom end of the lift pin ( 1 ) is, at least during the lifting operation, in contact with the the elevator system via a sole plate.
7 . Pin assembly according to claim 6 , wherein the sole plate comprises a top plate ( 7 ) being laterally movable relative to said elevator system.
8 . Pin Assembly according to claim 6 , wherein the sole plate further comprises a ball holding plate ( 8 ) with balls ( 9 ) being arranged beyond the top plate ( 7 ).
9 . Pin assembly according to claim 6 , wherein the ball holding plate ( 8 ) is laterally movable relative to said elevator system.
10 . Pin assembly according to claims 7 or 9 , wherein the lateral movement of top plate ( 7 ) and holding plate ( 8 ) is facilitated by elastic bearings ( 7 a, 8 a ).
11 . Pin assembly according to claim 1 , wherein the top end of the lift pin ( 1 ) further comprises a clearance being construed to hold a rolling ball ( 14 ).
12 . Pin assembly according to claim 11 , wherein the rolling ball ( 14 ) is supported by a ball bearing ( 13 ).
13 . Pin assembly according to claim 11 , further with a retaining ring ( 12 ) partially covering the clearance and preventing the lift pin from falling through the roller glide.