Power-assisted folding knife

Patent metadata

Field	Value
Publication number	US-11292141-B2
Application number	US-201916728502-A
Country	US
Kind code	B2
Filing date	Dec 27, 2019
Priority date	Jan 19, 2015
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A power-assisted folding knife, including: a blade holder; a blade arranged in the blade holder; a handle rotatably connected to the blade holder; a locking mechanism for locking the blade holder in an unfolded position and/or a folded position; the power-assisted folding knife further includes a power-assisting mechanism connected to the blade holder and the handle, for providing assisting power when unfolding a power-assisted folding knife. The power-assisted folding knife uses an assisting mechanism for providing assisting power when unfolding a folding knife, so as to facilitate easier unfolding of the folding knife and to allow single hand operation; the blade holder can be locked in an unfolded position and/or a folded position to ensure safe use of the power-assisted folding knife.

First claim

What is claimed is:

1. A power-assisted folding knife, wherein the power-assisted folding knife comprises:
a blade;
a power-assisted folding device, comprising:
a handle;
a carrying member used as a blade holder;
wherein the blade is arranged in the blade holder and the blade holder is rotatably connected to the handle about a rotation axis;
wherein the blade holder rotates relative to the handle around the rotation axis in a direction of folding when folding the power-assisted folding knife, and the blade holder rotates relative to the handle around the rotation axis in a direction of opening when unfolding the power-assisted folding knife;
an assisting mechanism connected to the blade holder and the handle;
wherein in at least a part of a stroke of the unfolding process of the power-assisted folding knife, the assisting mechanism generates a torque along the direction of opening relative to the rotation axis;
wherein the assisting mechanism comprises a first end and a second end, the first end being rotatably connected to the handle, and the second end being movably coupled to the blade holder, and during the process of folding or opening the power-assisted folding knife, the second end of the assisting mechanism passes over an extension line of a connection line between the first end and an axis of the handle only once;
wherein in at least a part of the stroke of the folding process of the power-assisted folding knife, the assisting mechanism generates a torque along the direction of folding relative to the rotation axis;
wherein there is a critical position during the process of folding or unfolding the power-assisted folding knife, and after the assisting mechanism passes over the critical position, the direction of the torque generated by the assisting mechanism relative to the rotation axis changes once between the direction of folding and the direction of opening;
wherein during the process of unfolding the power-assisted folding knife, after the second end passes over the critical position, the assisting mechanism generates the torque along the direction of opening relative to the rotation axis to provide assisting power for unfolding the power-assisted folding knife: during the process of folding the power-assisted folding knife, after the second end passes over the critical position, the assisting mechanism generates the torque along the direction of folding relative to the rotation axis to realize self-lock of the power-assisted folding knife;
wherein the assisting mechanism comprises an elastic member, the elastic member is a steel wire;
wherein the blade holder comprises a first portion and a second portion that are oppositely disposed, and the steel wire is arranged between the first portion and the second portion;
the first portion of the blade holder is arranged with a first arc-shaped slot, an axis of the first arc-shaped slot coinciding with the rotation axis; and
a first end of the steel wire is provided with a first curved part passing through the first arc-shaped slot and embedded in an aperture of the handle;
one side of the second portion of the blade holder, which faces toward the blade, is arranged with a slot, and a second end of the steel wire is provided with a second curved part embedded in the slot;
the second end of the steel wire is in the critical position when the second curved part of the steel wire moves to an extension line of a connection line of the first curved part and the rotation axis.

2. The power-assisted folding knife according to claim 1 , wherein the first portion and the second portion of the blade holder are integrated.

3. The power-assisted folding knife according to claim 1 , wherein the power-assisted folding knife further comprises a locking mechanism for locking the blade holder in an unfolded position and/or a folded position; wherein the locking mechanism is a side lock or a back lock.

4. The power-assisted folding knife according to claim 1 , wherein the blade holder is arranged with a blade-pushing pin; when unfolding the power-assisted folding knife, pushing the blade-pushing pin to overcome the torque along the direction of opening generated by the assisting mechanism.

5. The power-assisted folding knife according to claim 1 , wherein the blade is replaceably mounted in the blade holder.

6. The power-assisted folding knife according to claim 5 , wherein the blade is a trapezoidal blade.

7. The power-assisted folding knife according to claim 5 , wherein a portion of the blade holder where the blade is mounted is made as a whole.

Assignees

• Hangzhou Great Star Tools Co Ltd
• Hangzhou Great Star Ind Co Ltd

Inventors

• Wang Weiyi

Classifications

• B26B1/044 Primary

  by a spring tongue snapping behind or into the tang of the blade from a side part of the handle · CPC title

• B26B1/04 Primary

  lockable in adjusted position · CPC title

• B26B5/00

  Hand knives with one or more detachable blades · CPC title

• B26B1/048

  with a locking member being slidable or movable along the handle · CPC title