Abstract: Gear-driven shears include two grips, the fixed jaw, and the movable jaw and gear wheel module. The fixed jaw and the first grip are connected together at a joint of plate assembly module. The corresponding ends of movable jaw and the second grip are installed on the first pivot axle and second pivot axle of the plate assemble module. The characteristic of the invention is that one curved plate is installed additionally on one side of the movable jaw. Its first end is also installed on the first pivot axle of the plate assembly module sharing the same rotating point with the movable jaw. Meanwhile it is installed on the first edge of the curved plate together with the first tooth edge of the movable jaw. The second edge of the curved plate is equipped with wedge, which is locked in the notch on one side of the movable jaw. The middle section of curved plate is made into a curve.

Abstract: A gear-drive shear comprises two grips, the fixed jaw, and the movable jaw and gear wheel module. The fixed jaw and the first grip are connected together at a joint of plate assembly module. The corresponding ends of movable jaw and the second grip are installed on the first pivot axle and second pivot axle of the plate assemble module. This gear wheel module consists of two gears. They are installed between the corresponding ends of the movable jaw and the second grip on the plate assembly module respectively, among which, the same sides of these two gears jointly mesh with the tooth edge of the second grip, while the other side of the second gear wheel meshes with the tooth edge of the movable jaw. The characteristic of the invention is that one curved plate is installed additionally on one side of the movable jaw. Its first end is also installed on the first pivot axle of the plate assembly module sharing the same rotating point with the movable jaw.

Abstract: A pair of pipe shears includes a fixed jaw and a movable jaw pivoted with the fixed jaw. The fixed jaw is provided with a pipe-locating structure including two locating members, each being formed of a seat block and a back block. The seat block is provided with an arcuate skidproof surface while the back block is provided with a front inclined surface. The arcuate skidproof surface and the front inclined surface work in tandem to locate securely a pipe which is acted on by the blade of the movable jaw.

Abstract: A pivoting structure is provided to pivot together a first working block, a cutting blade, and a second working block of a pair of shears in such a manner that the cutting blade and the second working block work against each other to effect the scissors action. The pivoting structure includes a first locating slot disposed in the first working block, a pivot located in the first locating slot, a second locating slot disposed in the second working block, and a nut engaged with the pivot and located in the second locating slot.

Abstract: A pivoting structure is provided to pivot together a first working block, a cutting blade, and a second working block of a pair of shears in such a manner that the cutting blade and the second working block work against each other to effect the scissors action. The pivoting structure comprises a first locating slot disposed in the first working block, a pivot located in the first locating slot, a second locating slot disposed in the second working block, and a nut engaged with the pivot and located in the second locating slot.