November 29, 2010

CRK Umnumzaan : "Head of the family"


The Umnumzaan is a folding knife designed by Chris Reeve. The name "Umnumzaan" is derived from the Zulu language, meaning "Head of the family," or "Boss".


The Umnumzaan use a version of the Integral Lock developed by Reeve in 1987. This lock utilizes a ceramic ball that serves two functions; the ball acts as the interface between the blade locking surface and the integral locking arm as the knife assumes the open position. The ball also mates with a detent in the blade in the closed position.


The thumb lug on the Umnumzaan is used for opening the knife blade, as well as serving as the stop pin that contacts the titanium handle slabs upon lockup. Around each lug is a polyurethane o-ring that acts as a shock absorber to cushion the shock of opening, and reduce the audible noise of opening.


The Umnumzaan blade pivot is implemented with a pivot screw and pin, and is supported by perforated phosphor bronze thrust washers. The functions of the perforations are to reduce friction due to a reduction in surface area relative to that of a solid washer, and to increase the duration of use between cleanings by housing lubricant in the perforations.



Specifications:
• Blade material: CPM S30V Steel
• Blade hardness: 58-59 HRC
• Blade finish: Stonewash
• Blade length: 3.675 in (93.3 mm)
• Blade thickness: 0.140 in (3.6 mm)
• Handle length: 4.77 in (121 mm)
• Handle material: 6AI4V Titanium
• Fittings: 303 Stainless Steel



The pocket clip is sink down in the handle.


Closed, the blade can be used as a glass breaker.


A solid lock-up is provided by the integrall lock.



The Umnumzaan was introduced at the 2008 Blade Show and International Cutlery Fair, and was named the 2008 Blade Show "Overall Knife of the Year."