Auger and auger type ice making machine using the auger

An assembly of an auger accommodated in a vertically disposed cylindrical refrigerated casing in an auger type ice making machine for scraping an ice layer of thickness t formed around an inner periphery of said refrigerated casing and feeding the scraped ice upwardly, said auger comprising:

• a columnar main body;
• a spiral blade disposed around an outer periphery of said main body;
• said spiral blade including an upper end surface extending radially outwardly from said main body, a lower end surface spaced axially from said upper end surface and extending radially outwardly from said main body, and a tapered surface rectilinearly connecting extreme radially outer ends of said upper end surface and said lower end surface, said tapered surface including a radially innermost portion at said extreme outer end of said upper end surface and a radially outermost portion at said extreme outer end of said lower end surface;
• and
• said tapered surface being formed to have an angle of inclination .theta. which satisfies the following expression relative to the thickness t of the ice layer formed around said inner periphery of said refrigerated casing:
• d1-d2+T.multidot.tan .theta..gtoreq.t
• wherein d1 is a radius of said inner periphery of said refrigerated casing, d2 is a radius of said spiral blade at said extreme end of said lower end surface, and T is a thickness of said tapered surface in an axial direction of said main body.