Boring or penetrating the earth – Cutter element laterally shiftable below ground – Pivoted about substantially longitudinal axis
Patent
1975-11-06
1977-09-06
Leppink, James A.
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Pivoted about substantially longitudinal axis
61 5352, 175394, E21B 926, E21C 1304, E02D 546
Patent
active
040462056
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 foward 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.
REFERENCES:
patent: 2069482 (1937-02-01), Seay
patent: 2485826 (1949-10-01), Harinck
patent: 2783974 (1957-03-01), Veasman
patent: 2847189 (1958-08-01), Shook
patent: 2912228 (1959-11-01), Kandle
patent: 3864923 (1975-02-01), Turzillo
Kabushiki Kaisha Takechi Koumusho
Leppink James A.
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