Shield for tunneling and mining
AssigneePhilipp Holzmann Aktiengesellschaft
InventorWilfried Krabbe
Life of this patent
Estimating the term…
Abstract
A shield arrangement used for tunneling and mining in which a work chamber has an open front side located at the work face from which material is to be removed in tunneling and mining operations. Pressure is admitted into the work chamber for supporting the work face against crumbling and collapse. The work chamber also has supporting elements for the work face, which are selectively movable into and out of an operative position in which they support the work face. These selectively movable supports serve to replace at least partially, the support provided by the pressure medium admitted into the work chamber. The chamber has a longitudinal axis normal to the open side of the supporting elements which may be in the form of plates.
Claims18
A shield for tunneling and mining, comprising means for forming a work chamber having an open front which in use is located at the work face from which material is to be removed;
- means in said work chamber for removing material from the work face;
- means for admitting into the work chamber a pressure medium which supports the work face against crumbling and collapse;
- and work face supporting elements comprising rack elements interiorly supported and positioned within said work chamber in spaced relation to said work face, said elements being movable within said work chamber so as to engage and be supported against said work face;
- said elements having a first and a second part, said first part, when in the interiorly supported position, being positioned transverse to the longitudinal axis of the cylindrical shield and said first part longitudinally displaceable relative to said shield axis;
- said second part being pivotable relative to said first part said elements being selectively movable into and out of an operative position in which they support the work face in at least parallel replacement of the support afforded by said pressure medium.
Dependencies are inferred from the claim text.