Slipjoint


A slipjoint knife is one of the most ubiquitous types of pocketknives. A slipjoint knife consists of a handle with one or more folding blades. These blades are held in position by a strong "backspring" which biases them towards the open and closed position Contrast this with the penny knife, which has no locking mechanism other than friction, or locking knives which mechanically lock the blade in position.

Variants

The United States produced a massive array of slipjoint knife models from the mid-19th century to the present day. The following is a list of representative models and their defining features:
In several countries, such as the United Kingdom, slipjoints are used over locking folders due to laws regarding carrying knives for general use. In Germany, because the use of locking one handed opening knives is restricted, slipjoint knives are a viable alternative.