# Constant-force spring

Constant-force spring

A constant-force spring is a spring for which the force it exerts over its range of motion is a constant. That is, it does not obey Hooke's law. Generally constant-force springs are constructed as a rolled ribbon of spring steel such that the spring is relaxed when it is fully rolled up. As it is unrolled, the restoring force comes primarily from the portion of the ribbon near the roll. Because the geometry of that region remains nearly constant as the spring unrolls, the resulting force is nearly constant. A conical spring can be made to have a constant rate by creating the spring with a variable pitch. Putting a larger pitch in the larger OD coils and a smaller pitch in the smaller OD coils will force the spring to collapse all the coils at the same rate when compressed.

Wikimedia Foundation. 2010.

### Look at other dictionaries:

• Spring (device) — Helical or coil springs designed for tension Compression sp …   Wikipedia

• Constant speed propeller — Cutaway constant speed propeller hub …   Wikipedia

• Force-based algorithms — Force based or force directed algorithms are a class of algorithms for drawing graphs in an aesthetically pleasing way. Their purpose is to position the nodes of a graph in two dimensional or three dimensional space so that all the edges are of… …   Wikipedia

• Force — For other uses, see Force (disambiguation). See also: Forcing (disambiguation) Forces are also described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate …   Wikipedia

• spring — springlike, adj. /spring/, v., sprang or, often, sprung; sprung; springing; n., adj. v.i. 1. to rise, leap, move, or act suddenly and swiftly, as by a sudden dart or thrust forward or outward, or being suddenly released from a coiled or… …   Universalium

• Force field (chemistry) — In the context of molecular mechanics, a force field (also called a forcefield) refers to the functional form and parameter sets used to describe the potential energy of a system of particles (typically but not necessarily atoms). Force field… …   Wikipedia

• Spring scale — A spring scale is a weighing scale used to measure force, such as the force of gravity, exerted on a mass or the force of a person s grip or the force exerted by a towing vehicle. This force is commonly measured in newtons, for which one newton… …   Wikipedia

• Spring Offensive — This article is about the World War I German offensive of 1918. For the 1972 Spring Offensive during the Vietnam War, see Easter Offensive. German Spring Offensive, 1918 Part of the Western Front of World War I …   Wikipedia

• Spring-loaded camming device — A spring loaded camming device (also SLCD, cam or friend) is a piece of rock climbing or mountaineering protection equipment. It consists of three or four cams mounted on a common axle or two adjacent axles, so that pulling on the axle forces the …   Wikipedia

• spring constant — noun A characteristic of a spring which is defined as the ratio of the force affecting the spring to the displacement caused by it …   Wiktionary