FLUSH MOUNTED FASTENER FOR PLASMA PROCESSING APPARATUS
First Claim
1. A fastener assembly for use in a plasma processing chamber which avoids parasitic plasma formation when used to attach parts inside the plasma chamber, the fastener assembly comprising:
- a bolt having a tubular body with an axially extending center through hole, a threaded outer surface, and a tool engaging socket at the top of the through hole, the socket configured to engage a tool used to rotate the bolt during insertion of the bolt in a threaded hole;
a pin having a shaft extending a length greater than a length of the through hole, the pin being movable from a lower position at which an upper portion of the through hole is not filled to an upper position at which a top face of the pin is flush with a top face of the bolt;
a spring biasing the pin in the upper position.
1 Assignment
0 Petitions
Accused Products
Abstract
A fastener assembly for parts of a plasma chamber. The fastener assembly includes a bolt with a tool engaging socket and a spring-loaded pin which fits in a through hole of the bolt. When installed, the spring-loaded pin substantially fills the space in the socket and thus prevents parasitic plasma from forming in spaces between opposed surfaces of the pin and bolt. When a tool such as a hex key is inserted into the socket, the spring-loaded pin retracts and the tool rotates the bolt to attach an upper part to a lower part by engaging threads of the bolt with a threaded hole in the lower part.
34 Citations
12 Claims
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1. A fastener assembly for use in a plasma processing chamber which avoids parasitic plasma formation when used to attach parts inside the plasma chamber, the fastener assembly comprising:
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a bolt having a tubular body with an axially extending center through hole, a threaded outer surface, and a tool engaging socket at the top of the through hole, the socket configured to engage a tool used to rotate the bolt during insertion of the bolt in a threaded hole; a pin having a shaft extending a length greater than a length of the through hole, the pin being movable from a lower position at which an upper portion of the through hole is not filled to an upper position at which a top face of the pin is flush with a top face of the bolt; a spring biasing the pin in the upper position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification