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A Belleville washer is a type of spring shaped like a washer. It is the shape, a cone frustum , that gives the washer its characteristic spring. The "Belleville" name comes from the inventor Julien Belleville who in Dunkerque , France, in 1867 patented a spring design which already contained the principle of the disc spring.
Belleville washer A disc shaped spring commonly used to apply tension to a bolt (and also in the initiation mechanism of pressure-activated landmines) Constant-force spring A tightly rolled ribbon that exerts a nearly constant force as it is unrolled Gas spring A volume of compressed gas. Ideal spring
A washer with a slight conical shape, which provides an axial force when deformed. The surface may be serrated, which will have improved locking capabilities. [4] Curved disc spring Similar to a Belleville, except the washer is curved in only one direction, therefore there are only four points of contact.
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A belleville may supply the designed pre-load, but the bolt may have an additional locking mechanism (loctite, for example) that would fail without the belleville. A fender washer is a flat washer with an oversized O.D. This type of washer distributes the capscrew's clamp-load over a greater area. 209.102.125.87 01:47, 22 Aug 2004 (UTC)
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