Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent
1974-10-02
1977-03-08
Moon, Charlie T.
Boring or penetrating the earth
With tool shaft detail
Shaft carried guide or protector
29522, 175408, 408 83, 408202, E21B 1710, E21C 900
Patent
active
040108074
ABSTRACT:
A substantially cylindrical hole is drilled into a support structure, and the end of the hole remote from the point of entry of the drilling tool into the structure is enlarged in its cross-sectional area so as to provide abutment surfaces for spreading portions of a fastening element inserted into the hole subsequently to the drilling thereof. The drilling tool includes a drill shaft, and a drill bit connected to the free end of the drill shaft and having lateral cutting edges. The cutting edges may diverge in direction axially away from the drill shaft and a collar may be provided on the drill shaft which, in cooperation with the inner surface bounding the hole forms a fulcrum for a lever-type angular displacement of the drilling tool for increasing the cross-sectional area of the remote end of the hole. The collar may be mounted on the drill shaft for displacement between a plurality of axially spaced positions and for arresting in any one of these positions so as to adjust the drilling tool to a particular depth of the hole to be drilled.
REFERENCES:
patent: 1170221 (1916-02-01), Craven
patent: 1283740 (1918-11-01), Groff
patent: 1336800 (1920-04-01), Vincent
patent: 2583429 (1952-01-01), Johnson
patent: 2794468 (1957-06-01), Huxtable
patent: 2833168 (1958-05-01), Nelson
patent: 2903920 (1959-09-01), Blecha
patent: 2932196 (1960-04-01), Sledz
patent: 3372610 (1968-03-01), Johansson
patent: 3403594 (1968-10-01), Newell
patent: 3477481 (1969-11-01), Czerniewicz
Moon Charlie T.
Striker Michael J.
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