Patent ID: 8595941
Filing Date: 2013-12-03
Classification: B26B

Abstract:
1. An assisted-opening knife comprising: a holder being elongated and hollow, and having a slit longitudinally formed on one side thereof and a front opening formed on a front end thereof; a blade slidably mounted in the holder for being expanded out of or retracted into the holder through the front opening; a blade carrier mounted in the holder and having a slot longitudinally formed thereon, wherein the slot includes an expanded portion formed adjacent to a rear end of the slot and the expanded portion includes a bevel surface inclining downwardly from the slot in a rearward direction and a horizontal surface formed between the bevel surface and the rear end of the slot; a slider assembly mounted in the holder and comprising: a sliding seat having a protrusion extended outside the holder through the slit and having one side fixed to one side of the blade; a sliding piece slidably mounted within the slot and having one side fixed to another side of the sliding seat; a thumb stud fixed to the protrusion; a fixing piece having one side fixed to another side of the sliding piece; and a locking member pivotally mounted on another side of the fixing piece and having an engagement portion transversely protruding from a rear bottom edge of the locking member and held in the expanded portion of the slot; a stopper pivotally mounted on the blade carrier at a position adjacent to the front opening for engaging with the fixing piece and preventing the blade from being pushed back into the holder when the blade is fully expanded out of the holder; and a spring having a rear end tied to the locking member and a front end tied to a front portion of the blade carrier; thereby, when the blade is fully retracted into the holder, a tensile force of the spring forces the engagement portion to be slid onto the horizontal surface of the expanded portion through the bevel surface.