Title: Earth auger and method for driving piles and the like by means of said earth auger

Abstract: An earth auger is disclosed in which an auger shaft is provided with freely expansible and contractible rotary blades in such manner that said rotary blades may expand automatically when said auger shaft is rotated in the forward direction and may contract automatically when said auger shaft is rotated in the reverse direction. Also a method for driving piles and the like is disclosed which comprises the steps of positioning a pile or shoring adjacent to said auger shaft and above said blades, advancing said pile or the like into an earth bore excavated by said rotary blades, and filling said bore excavated by the rotary blades with mortar or the like.

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Inventors: Asayama, Kingo (Hirakata, JA)

Application Number: 465091
Filing Date: 1974-04-29
Publication_date: 1976-02-17
Assignee: Kabushiki Kaisha Takechi Koumusho (Osaka, JA)
Primary Class(es): 405/238 52/155, 52/160, 175/171, 405/248
Other Classes:
US Patent Ref:

2912228	Nov, 1959	Kandle	175/292.
3420320	Jan, 1969	Washita	61/53.
3422629	Jan, 1969	Watts	61/53.
3499293	Mar, 1970	Kato	61/53.
3530675	Sep, 1970	Turzillo	61/53.
3742717	Jul, 1973	Wey	61/53.
3864923	Feb, 1975	Turzillo	61/53.

Other Refs:
Primary Examiner: Shapiro, Jacob
Assistant Examiner:
Attorney: Price, Heneveld, Huizenga & Cooper