Method and apparatus for upwardly cutting full cutting face of a shaft without requesting workmen's hands

Patent · Tue Feb 03 00:00:00 EST 1981

OSTI ID:6453914

Jinno, T; Kikuchi, T; Kotake, Y

There is provided a method and apparatus for upwardly excavating a shaft through destructible underground rock. The cutting operation is carried out by full face boring without relying on blasting. An operation for supporting the shaft side wall is carried out by means of frame segments loosely following the advance of the bit. The cutting operation and supporting operation are independent from one another. The diameter of the bit is contracted after the cutting operation to allow the bit to be lowered down through the frame segments.

• Assignee: Dowa Mining Co Ltd (Japan); Koken Boring Machine Co Ltd (Japan)
• Patent Number(s): US 4248312
• OSTI ID: 6453914
• Resource Relation: Patent Priority Date: Priority date 28 Apr 1977, Japan
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ROTARY DRILLS
PERFORMANCE
SHAFT EXCAVATIONS
CONSTRUCTION
ROCK DRILLING
ROTARY DRILLING
UNDERGROUND
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
LEVELS
420206* - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)
422000 - Engineering- Mining & Underground Engineering- (1980-)