Silencer and a method for forming and attaching a silencer to a blower pipe

Abstract

A method of forming and attaching a silencer to a blower pipe involves a silencer that has an inner pipe with many silencer holes and a sound absorption material extending longitudinally around its outer periphery. The blower pipe may be connected to a blower so that a high speed air stream passe through an interior of the inner pipe. The method has the steps of forming the inner pipe by resilient deformation of a flexible member (such as a pair of thin plates or a helically-formed flexible strip) that has a stress-free length preventing it from inserted into the blower pipe without first being deformed. Then, the resiliently-deformed flexible member is introduced into the blower pipe, and the silencer is attached to the blower pipe using a resilient restoring force that was caused by the resilient deformation.

Dependencies are inferred from the claim text.