06959494 is referenced by 17 patents and cites 67 patents.

A folding knife having a blade and integral tang pivotally mounted to a handle with a cantilever spring fixedly attached at one end to the handle and extending to a free, terminal end having a lobed portion. A camming member fixed to the tang has a camming surface spaced from the pivot axis extending through the tang. The lobed portion of the spring contacts the camming surface when the blade is in the fully closed position and remains in contact throughout a first portion of the blade movement toward the open position. The spring is out of contact with the camming surface during a second portion of blade movement, from the end of the first portion to the fully open position. Momentum developed by spring force applied to the camming member during the first portion of blade movement is sufficient to move the blade through the second portion of its movement to the fully open position. Cooperative stop portions on the tang and handle define the limits of blade movement to fully open and closed positions, and resiliently lock the blade in the fully open position.

Title
Folding blade knife with spring assisted pivoting feature
Application Number
10/680751
Publication Number
6959494 (B2)
Application Date
October 7, 2003
Publication Date
November 1, 2005
Inventor
William J Taylor
Marietta
GA, US
Agent
Bond Schoeneck & King PLLC
George R McGuire
Assignee
Camillus Cutlery Company
NY, US
IPC
B26B 001/04
View Original Source