Patent ID: 8888030

Claim:
A paper shredder comprising: a casing; a shredding knife assembly disposed within said casing; a paper placement platform disposed over said shredding knife assembly for supporting said paper stack; a feeding roller assembly arranged between said paper placement platform and said shredding knife assembly and exposed through said paper placement platform for feeding said paper stack to said shredding knife assembly; an upper cover; and a pressing structure, said pressing structure being disposed under said upper cover, wherein said pressing structure comprises: a base plate to be contacted with a paper stack; and a retractable member connected with said base plate and said upper cover, and comprising: a push rod; a first sleeve comprising a first hollow portion, wherein said push rod is inserted into said first hollow portion of said first sleeve; and an elastic element disposed within said first hollow portion of said first sleeve, wherein when said paper stack is contacted with said base plate to push said push rod, said push rod is transferred through said first hollow portion of said first sleeve, and said elastic element is pushed by said push rod, so that said elastic element generates an elastic force to press said paper stack.