Offset drilling machine

Details Offset drilling machine Offset drilling machine

1978-06-19

1981-01-27

Leppink, James A.

Tool driving or impacting

Swinging arm causes advance with means to guide rectilinear...

175 57, E21B 1504

Patent

active

042469740

ABSTRACT:
Apparatus for drilling a pier hole under the ledge of a building foundation to permit lifting the foundation for relevelling of the building, the apparatus having an adjustable drill support frame to drill downwardly. A transmission and drill bit depending from said drill support frame and a crowd bar adapted to move the drill bit under the foundation once the top of the drill bit is has passed the bottom of the foundation. By moving the drill bit under the foundation this permits a more vertical shaft providing better support for the foundation.

REFERENCES:
patent: 1071477 (1913-08-01), Stowe
patent: 2217300 (1940-10-01), Templeton
patent: 2320775 (1943-06-01), Garner
patent: 2468319 (1949-04-01), Adams
patent: 2558642 (1951-06-01), Clark et al.
patent: 2959398 (1960-11-01), Troche
patent: 4066134 (1978-01-01), Karns

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