Method for pillar recovery in chamber-and-pillar working and...

Details Method for pillar recovery in chamber-and-pillar working and... Method for pillar recovery in chamber-and-pillar working and...

2006-08-24

2009-06-02

Kreck, John (Department: 3672)

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

C405S290000

Reexamination Certificate

active

07540693

ABSTRACT:
Methods for pillar recovery in chamber-and-pillar working materials in underground stratified beds are disclosed. Additionally, tubbing units for pillar recovery in chamber-and-pillar working of materials in underground stratified beds are disclosed. An extraction device is aligned obliquely to pillar galleries located between the pillars and the roof is supported in front of the retreat face of the extraction device with a plurality of tubbing units, each tubbing unit being adjustable in height and width and movable through operation of a vehicle. The tubbing units may be moved through other tubbing units that are set, and reset in another position.

REFERENCES:
patent: 3328966 (1967-07-01), Creuels et al.
patent: 3505823 (1970-04-01), Bell
patent: 3855802 (1974-12-01), Alacchi
patent: 3892100 (1975-07-01), Jamison
patent: 4026118 (1977-05-01), McCay, Jr.
patent: 4143991 (1979-03-01), Stafford
patent: 5584611 (1996-12-01), Clonch
patent: 30 09 923 (1980-03-01), None
patent: 32 38 256 (1982-10-01), None

Affiliated with

Also associated with

Rating

Method for pillar recovery in chamber-and-pillar working and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for pillar recovery in chamber-and-pillar working and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for pillar recovery in chamber-and-pillar working and... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4091738