Patent ID: 7987601

Claim:
A folding tool, comprising: a first side plate and a second side plate, said first and second side plates defining a storage space therebetween and said first and second side plates having a dorsal portion; an elongate plate formed in the dorsal portion of one of said first or second side plates, said elongate plate provided with a pushing pressure toward said storage space and having a tip with a convex portion; a blade foldably attached between the first and second side plates at a tang portion of said blade, and said blade foldable between a first state in which the blade is stored in the storage space, and a second state in which the blade is in an open state, said blade having a concave portion on the tang portion of said blade that engages with the convex portion of the elongate plate when the blade is in the open state to lock said blade in said open state, wherein when said blade is locked in the open state and pressure is applied to said blade to fold it toward the first state, the engagement between the convex portion of the elongate plate and the concave portion of the tang portion of the blade causes tension to be applied to said elongate plate in a direction that is substantially parallel to the longitudinal axis of said elongate plate.