Abstract: The present invention relates to a frame width adjusting structure of the paper shredder and is mounted on a paper shredder main body containing a paper shredding tool, a control circuit, and a drive motor. The main body is provided in one side with a retaining piece extending downwards. The frame width adjusting structure comprises two expandable rods parallel to each other and disposed in other side of the main body to be opposite to the retaining piece; a bridging member connecting the outer ends of the two expandable rods and having a receiving cell with an opening that faces downwards; two fixation pillars disposed at top end sin the top of the receiving cell of the bridging member; two connection rods pivoted with bottom ends of the two fixation pillars; a pull handle provided at the outer end with a retaining piece extending downwards and pivoted with other end of the two connection rods.

Abstract: A brush chipper that enables easy and ready access to frequently maintained areas of the chipper comprises a chipper-knife assembly, a feed-roller assembly, and a sliding apparatus that allows the feed-roller assembly to move away from the chipper-knife assembly. This sliding apparatus, preferably, includes at least one track and at least one friction-reducing apparatus. The brush chipper preferably includes a chipper-knife assembly that comprises a knife with at least one threaded opening for attaching the knife to a support. To attach the knife to the support, a bolt threads through the support to secure the knife. The bolt includes a head and a stem, and the support is positioned between the knife and the head of the bolt.

Abstract: The machine comprises a front door, a roll cover having a main roll cover and a feed roll cover, a first fulcrum axis between the main and feed roll covers, and a second fulcrum axis between the feed roll cover and a frame. The front door has a hinge at the upper portion so that it is kept at a self-supporting state when opened. The main roll cover is foldable on the feed roll cover about the first fulcrum axis. The feed roll cover is swung upwardly about the second fulcrum axis and is finally kept at the self-supporting state with the main roll cover folded on the feed roll cover. Where the front door and the roll cover are kept in their self-supporting states, since a pair of rolls and a stock feeder are fully exposed, the remaining stock accumulated in the machine can be removed easily.