Abstract A self-advancing mine roof support has a first or main roof supporting member and a second roof supporting member movable relatively to said first roof supporting member in the direction of advance of the support. The second roof supporting member has laterally extensible means on elements for abutting similar extensible means or elements or an adjacent support. The abutting means or elements serve to guide the supports during their advance and also prevent the caving of the roof between adjacent supports. Conveniently the second roof supporting member constitutes a connecting element for connecting a roof-engaging member, at the forward part of the second roof supporting member, to the first or main roof supporting member, the first or main roof supporting member having guiding and pivotal supporting means for the second roof supporting member or connecting element. Conveniently the second roof supporting member or connecting element is of shieldlike construction so that, in conjunction with a shield-like construction of the rear of the base of the support, it prevents mineral flushing into the support. The second supporting member or connecting element may be supported on a prop which is tiltable towards the mineral face so as to advance the second roof supporting member.
A mine roof support with a base plate on which prop means carry a first roof supporting member and with a second roof supporting member in front of the first roof supporting member which is movable relatively thereto towards the working face and carried by connecting elements of shield-like construction arranged on either side of the first roof supporting member, said connecting elements are guided longitudinally and pivotally supported at their rear ends on both sides of the first roof supporting member at a distance below the roof engaging surface thereof, are pivotally connected with their forward ends to the second roof supporting member and are supported by further prop means which is attached to the base plate and tiltable in a direction towards the working face, wherein the connecting elements are provided with laterally extensible shield parts which are guided in slot guides in the connecting elements and which slot guides extend transversely to the direction of advance of the support.
Claim 2
Dependent Claim
162 words
A mine roof support with a base plate on which prop means carry a first roof supporting member and with a second roof supporting member in front of the first roof supporting member which is movable relatively thereto towards the working face and carried by connecting elements of shield-like construction arranged on either side of the first roof supporting member, said connecting elements are guided longitudinally and pivotally supported at their rear ends on both sides of the first roof supporting member at a distance below the roof engaging surface thereof, are pivotally connected with their forward ends to the second roof supporting member and are supported by further prop means which is attached to the base plate and tiltable in a direction towards the working face, wherein the connecting elements are provided with laterally extensible shield parts which are guided in slot guides in the connecting elements and which slot guides extend transversely to the direction of advance of the support.
Claim 3
Dependent Claim
60 words
A mine roof support as claimed in claim 1 wherein the first roof supporting member is in the form of a box, open at its lower part and the lower edges of which have horizontal flanges in which there are said slot guides for the rear ends of the connecting elements between the first and the second roof supporting members.
Claim 4
Dependent Claim
64 words
A mine roof support as claimed in claim 1 wherein the first roof supporting member has at its front end an extension which is extended below the second roof supporting member and which covers the space between the front edge of the first roof supporting member and the rear edge of the second roof engaging member on each possible advance distance between both mmembers.
Claim 5
Dependent Claim
25 words
A mine roof support as claimed in claim 1 wherein the connecting elements are provided with pressure-medium cylinders for extending the laterally extensible shield parts.
Claim 6
Dependent Claim
42 words
A mine roof supports as claimed in claim 1 wherein the laterally extensible shield parts have on their outwardly directed edges support plates arranged on a vertical plane and which are used for abutting on similar support plates of neighbouring support assemblies.
Claim 7
Dependent Claim
22 words
A support assembly as claimed in claim 3 wherein the upper surface of the extension is inclined downwardly towards the working face.