The word impact makes sense that in this particular type of crusher some impaction is being used for crushing of rocks. In normal types of crusher pressure is generated for the crushing of rocks. But, impact crushers involve an impact method. The first Vertical Shaft Impact Crusher was invented by Francis E. Agnew in 1920s. They are designed to be used in secondary, tertiary or quaternary stage crushing. The crushers are suitable for a wide range of applications including the production of high-quality manufactured sand, well-formed aggregates and industrial minerals. Crushers can also be used for shaping or removal of soft stone from aggregate.