Patent ID: 8773868

Claim:
A holder for supporting an add-on card on a main circuit board, and electrically grounding the add-on card, wherein a grounding element is disposed at an edge of the add-on card, the holder comprising: a main-body, disposed on the main circuit board, wherein the main-body comprises a front side, a rear side, and a top side; a support portion protrudes from the front side; and the support portion provides a supporting surface for supporting the edge of the add-on card; a moving-arm, comprising a support block and an extension block, wherein the extension block is connected to the support block; the support block is disposed on the front side of the main-body in a movable manner; an upper edge of the support block and the supporting surface are arranged in the same plane for supporting the edge of the add-on card; and the moving-arm moves to make the extension block protrude from the main-body with a gap existing between the extension block and the main circuit-board; a fixed metal piece, disposed on the main-body and electrically grounded, wherein a part of the fixed metal piece extends to a location between the support block and the front side; and a moving metal piece, having a part disposed on the support block and located between the support block and the front side for contacting with the fixed metal piece, and the other part extending to the extension block, so that at least a part of the moving metal piece is exposed corresponding to the front side.