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Liner lock
The Linerlock is a locking mechanism for folding pocket knives. A Linerlock is a folding knife with a side-spring lock that can be opened and closed with one hand without repositioning the knife in the hand. The lock is self-adjusting for wear. The modern Linerlock traces its lineage to the late 19th century, but in the 1980s the design was improved by American custom knifemaker Michael Walker.
==History==
Linerlock knives have been around since the late 19th century. The Cattaraugus liner locking patent, 825,093 was issued on July 3, 1906. After 1923 when the patent expired, it was used by other manufacturers such as in the common military and lineman's issue two-blade electrician’s knife; the Camillus TL-29 for the locking screwdriver-stripper blade, until 2007 when the Camillus Cutlery Company went out of business.
Walker refined and popularized the design, eventually securing a trademark〔SN 73813333〕 for the name "Linerlock" in March of 1990. Walker's improvement to the design was to facilitate true one handed opening of the knife.〔 This was accomplished by removing the weak back spring and adding a heat-treated stop pin to align the blade in the open position.〔 Walker added a detent ball to hold the blade in the closed position using the same spring force from the liner.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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