way for more innovations. One of these being the thumb hole: a Spyderco patent where the user presses the pad of his thumb against a hole and opens the blade by rotating his thumb similarly to using the thumb-stud. Another innovation of Sal Glesser, Spyderco founder, was the clip system, which he named a "Clip-it". Clips are usually metal or plastic and similar to the clips found on pens except thicker. Clips allow the knife to be easily accessible, while keeping it lint-free and unscathed by pocket items such as coins. Assisted opening systems have been pioneered by makers like Ken Onion with his "Speed-Safe" mechanism and Ernest Emerson's Wave system, where a hook catches the user's pocket upon removal and the blade is opened during a draw. . One of the first one handed devices was the automatic spring release, also known as a switchblade. An innovation to pocket knives made possible by the thumb-stud is the replaceable blade insert developed in 1999 by Steven Overholt (U.S. Patent no. 6,574,868), originally marketed by TigerSharp Technologies and as of 2007 by Clauss.
Legal issues
Main article: Knife legislation
Pocketknives are legal to own in most countries, but they face legal restrictions on their use. While pocketknives are almost always designed as tools, they do have the potential to become weapons. In some jurisdictions it is illegal to conceal knives larger than a certain size, or with certain locking or opening mechanisms. They are often banned or heavily restricted in secure areas, such as schools and airports. Switchblades and other "auto-openers" are banned from interstate shipment by the U.S. Government and prohibited entirely in some states, although certain statutes allow an exception permitting ownership by the handicapped, military, and police.
It is illegal to carry knives in public in the United Kingdom without "good reason". This term is not defined, but examples of "religious duty", "national dress" and "requirement of employment or hobby" are given. It is up to a police officer's individual discretion, and ultimately a magistrate to decide whether or not the requirements of "good reason" are met.. Folding knives with blades of 3 inches or less may be carried without needing to provide "good reason" so long as the blade is not capable of being locked in the open position. However, it is illegal to have the intention of using any object in public as a weapon, meaning that even a knife that is legal to carry without needing 'good reason' may still be found to be illegal if the police officer has grounds to suspect it will be used as a weapon.
References
^ Lake, Ron; Centofante, Frank; Clay, Wayne (1995). How to Make Folding Knives/a Step-By-Step How-To: A Step-By-Step How-To. Krause. pp. 190. ISBN 0873413909.
^ Stewart, Ron; Ritchie, Roy (2000). Big Book of Pocket Knives: Identification & Values. Collector Books. pp. 348. ISBN 978-1574321784.
^ Horvth, Lszl; Kovcs, Tibor; Szab, Mikls (1987). Transdanubia I (Corpus of Celtic Finds in Hungary) (v. 1). Akademiai Kiado. pp. 3841. ISBN 978-9630538077.
^ Emerson, Ernest R. (2003), "Grandpa Gave a Part of Himself With That First Knife", Sporting Knives 2003: 5459, ISBN 0-87349-430-X
^ Barlow, Edson. "Our Knife". www.barlowgenealogy.com. http://www.barlowgenealogy.com/Edson/barlowknife.html. Retrieved 2008-11-18.
^ "History of Barlow Knives". Advantage-Advertising,LLC. http://www.barlow-knives.com/history.htm.
^ Pacella, Gerard (2002). 100 Legendary Knives. Krause Publications. p. 101. ISBN 978-0873494172.
^ Price, C. Houston; Mark D. Zalesky (2008). The Official Price Guide to Collector Knives, 15th edition. House of Collectibles. pp. 164166. ISBN 978-0375722806.
^ a b c Dick, Steven (1997), The Working Folding Knife, Stoeger Publishing Company, pp. 280, ISBN 9780883172100
^ Terzuola, Bob (2000). Title The Tactical Folding Knife: A Study of the Anatomy and Construction of the Liner-Locked Folder. Krause Publications. p. 158. ISBN 978-0873418584.
^ Hopkins, Cameron (2000), "The Worse it Gets, the Better We Like It", American Handgunner Magazine 25 (157): 9293
^ Walker, Greg (1993). Battle Blades: A Professional's Guide to Combat/Fighting Knives. Krause Publications. p. 210. ISBN 978-0873473274.
^ Hartink, A.E. (September 30, 2005). Complete Encyclopedia of Knives. Lisse, The Netherlands: Chartwell Books. pp. 448. ISBN 9781854091680.
^ a b Delavigne, Kenneth (2004). Spyderco Story: The New Shape of Sharp (Hardcover). Colorado: Paladin Press. p. 312. ISBN 1-581-60060-7.
^ Young, Robert (2001). "Secrets of the Blade". Black Belt 39 (4): 9297.
^ "British Knife Collectors Guild 'The Law' page". http://www.bkcg.co.uk/guide/law.html. Retrieved 2006-11-19.
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Knife manufacturers
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Knifemakers
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Categories: Pocketknives | Backpacking
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