Abstract: A tree pruner has a extension rod, a cutting set and a pull cord. The cutting set is mounted on the top end of the extension rod and has a stationary blade, a pivoting blade, an actuating lever and a pinion gear. The stationary blade is securely connected to the top end of the extension rod. The pivoting blade is pivotally attached to the stationary blade and has multiple driven teeth. The actuating lever is pivotally attached to the stationary blade and has multiple actuating teeth. The pinion gear is rotatably mounted on the stationary blade and engages the driven teeth on the pivoting blade and the actuating teeth on the actuating lever. Accordingly, the cutting set can easily cut off a tree branch, and the force applied to the pull cord is magnified at the blades of the tree pruner.

Abstract: A pair of pruning shears has two bodies pivotally mounted together with a pivot, a spring connected between the bodies, and a lock device arranged near the pivot. The lock device comprises a step hole defined in one of the bodies near the pivot, a locking hole defined in the other body, a latch post moveably mounted in the step hole, a biasing member to support the latch post, and a knob. The knob is rotatably mounted on the body with the step hole. The knob has a bottom abutting the latch post and a cavity defined in the bottom. When the bodies are pushed toward to each other, the step hole will align with the locking hole. The latch post can be pushed to engage with the locking hole by the bottom of the knob. This can provide a secure positioning effect to the latch post. The latch post will not escape from the locking hole when the pruning shears bump with another object.