Scroll member for scroll type fluid displacement apparatus

Abstract From the Canadian patent

A scroll type fluid displacement apparatus is disclosed in which a pair of scrolls interfit at an angular and radial offset each, scroll including a circular end plate and a spiral element. The outer wall surface of each spiral element, which extends from an outer terminal end of the spiral element to the point of contact with the outer terminal end of the opposed spiral element at the orbital position where the sealed off fluid pockets are initially formed is a, rough unfinished surface. Accordingly the time for manufacturing, each spiral element is reduced and waste of material which is produced when the scroll surfaces are finished by turning is decreased.