Patent ID: 8863394

Claim:
A folding knife, comprising: a blade; a pivot; a handle comprising a first panel, a second panel, and a third panel, wherein a portion of the blade that is adjacent to a first end thereof is pivotally connected between the first panel and the second panel by the pivot at a position adjacent to an end of the handle, such that a second end of the blade is rotatable about the pivot and can be rotated out of the handle or be rotated into and received in the handle, the second panel being provided with a resilient locking arm, the resilient locking arm having a first end fixed to the second panel and a second end extending slantingly toward the first panel, wherein while the blade is being rotated out of the handle, a lateral surface of the resilient locking arm that is adjacent to the second end thereof is pressed against a lateral surface of the blade, and once the blade is rotated out of the handle completely, the second end of the resilient locking arm is pressed against the first end of the blade to secure the blade in a fully opened state, the resilient locking arm further having a first engaging portion; and a positioning plate movably positioned between the second panel and the third panel, corresponding in position to the resilient locking arm, and displaceable along a longitudinal direction of the resilient locking arm, the positioning plate having a first end jutting out of the handle, there being a restoring spring disposed between a second end of the positioning plate and the second panel or the third panel, the positioning plate further having a second engaging portion corresponding in configuration to the first engaging portion, wherein when the blade is fully opened and the second engaging portion is moved into engagement with the first engaging portion, the second end of the resilient locking arm is forced to disengage from the first end of the blade, thus allowing the blade to be rotated into and received in the handle, and when the blade is fully opened and the second engaging portion is moved out of engagement with the first engaging portion, the second engaging portion presses against the resilient locking arm such that the second end of the resilient locking arm remains pressed against the first end of the blade and thereby prevents the blade form being rotated into and received in the handle.