E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
61/67
E21D 23/08 (2006.01) E21D 23/00 (2006.01) E21D 23/10 (2006.01)
Patent
CA 1136871
TUNNEL ROOF SUPPORTING APPARATUS ABSTRACT OF THE DISCLOSURE The invention relates to a self-advancing roof supporting apparatus for providing temporary support of a portion of the roof of a tunnel, for example in an underground mine such as a coal mine. When tunnels are being extended, temporary roof supports need to be erected whilst the newly excavated material is removed and perm- anent roof supports installed. The apparatus of the invention has means engageable upon the permanent roof-supports to suspend the apparatus therefrom, and preferably has two relatively slidable gripp- ing devices (5) or sets of devices to enable the apparatus to be advanced or withdrawn along the tunnel. - 1 -
328055
Harding John D.
Westell & Hanley
LandOfFree
Roof supports does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Roof supports, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Roof supports will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-22879