Abstract: The present invention discloses a mobile phone holder with an automatic clamping function. The mobile phone holder includes a base and an automatic clamping mechanism. The automatic clamping mechanism includes a clamping arm, a gear, a one-way ratchet, a key spring, a button, and a driving component. The clamping arm is slidably mounted on the base, a clamping space is defined between the clamping arm and the base, the clamping arm is provided with a rack portion, the gear is rotatably mounted in the base, the rack portion is engaged with the gear, the one-way ratchet is mounted above the gear, the one-way ratchet rotates along with the gear, the key spring is elastically clamped between the gear and the one-way ratchet, ratchet teeth are disposed on the upper end of the one-way ratchet, a clamping slot is disposed on the base, the button is mounted above the one-way ratchet.

Abstract: The present invention discloses an expansion chassis for a notebook computer, including: a base, wherein the base is provided with a plug-in area, and a first circuit board is disposed inside the base; a plug-in mechanism including a plurality of plug-in interfaces electrically connected to the first circuit board; a clamping mechanism including a fixed clamping arm and a movable clamping arm, the fixed clamping arm is provided with a connecting plug, and the movable clamping arm is provided with a fixed structure; and a second circuit board, wherein the second circuit board is electrically connected to the first circuit board, the connecting plug is electrically connected to the second circuit board, the upper surface of the base is in contact with the bottom surface of the notebook computer, and the upper surface of the base is matched with the bottom surface of the notebook computer to form surface contact.