Appeal No. 95-3883
Application No. 08/147,987
3, 5 and 6. These are the only claims remaining in the
application.
The claimed invention is directed to a composite anchor
having an anchoring rod and a cartridge filled with hardenable
bonding agent which secures the anchoring rod in a borehole.
Typically, such devices are used as rock bolts in underground
mining. When such bolts are used in the roof and one of the
hardenable components is a liquid, the problem of leakage out
of the borehole before the anchor is fixed has been
recognized. Appellants' invention, which uses mineral mortar,
places a thixotropic agent in the water that hardens the
mortar. The thixotropic agent maintains the water in a gel or
paste-like state until the gel is sheared by movement of the
anchoring rod.
Claim 1, reproduced below, is further illustrative of the
claimed subject matter.
1. A composite anchor, comprising a rotatable anchoring
rod; a crushable cartridge filled with two components of a
hardenable bonding agent which include a mineral mortar
component and a water component separated from one another by
crushable separating means provided with a thixotropic agent
which is paste-like unless it is subjected to shear forces,
said thixotropic agent being amorphous, pyrogenic silicic acid
admixed with said water component in a proportion of 0.5% to
10%; and means for rotating said anchoring rod and screwing
2
Page: Previous 1 2 3 4 5 6 7 Next
Last modified: November 3, 2007