Patent ID: 9591808
Date: 2017-03-14
CPC Classifications: A01G

Claim:
1. A gardening shears comprising: a first blade; a driving arm having a top end pivotally connected with the first blade, and an external guide groove; two handles, one of the handles having a top end fixedly connected with a bottom end of the first blade and the other of the handles having a top end fixedly connected with a bottom end of the driving arm; a second blade pivotally connected with the first blade and provided with a sliding groove having a side wall, and a plurality of positioning recesses linearly arranged at the side wall of the sliding groove; a link arm having a first pivot end pivotally connected with the driving arm via a first shaft, a second pivot end pivotally connected with the second blade via a second shaft which is slidable in the sliding groove of the second blade and engageable with one of the positioning recesses, and a stop notch located between the first and second pivot ends and adjacent to the first pivot end; a spring installed between the driving arm and the first pivot end of the link arm; and a switching device including a control latch upwardly and downwardly moveable in the external guide groove of the driving arm and being at a distance from the first pivot end of the link arm, a moveable plate disposed at the driving arm and connected with the control latch, and a stop pin connected with a top portion of the moveable plate, and the stop pin being moveable to stop at the first pivot end of the link arm or engage with the stop notch of the link arm when the driving arm is pivotally turned relative to the first blade; wherein the moveable plate and stop pin synchronously move upwards and downwards along with the upward and downward movement of the control latch, and the link arm is not synchronously moved upwards and downwards along with the upward and downward movement of the control latch; and wherein the switching device further comprises first and second fixed plates mounted inside the driving arm and located at two opposite sides of the moveable plate, respectively; the first fixed plate has a first internal guide groove corresponding to the external guide groove of the driving arm; the second fixed plate has a second internal guide groove corresponding to the first internal guide groove; the control latch includes a latching member upwardly and downwardly moveable in the external guide groove of the driving arm and the first internal guide groove of the first fixed plate, and a sleeve upwardly and downwardly moveable in the second internal guide groove.