Mine roof bolt anchor
Patent 5885031 Issued on March 23, 1999. Estimated Expiration Date: 
December 8, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 8, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesBinder-injecting rockbolt Reusable anchor Mine roof expansion anchor Mine roof expansion anchor shell and leaf Expansion assembly for mine roof bolts Mine roof expansion anchor and bail element Hybrid eccentric wedge anchor Patent #: 5413441 InventorApplicationNo. 986842 filed on 12/08/1997US Classes:405/259.4, Bolt having wedge expander405/259.1, Rock or earth bolt or anchor411/32, Made up of plural expansible segments or sections411/349, Securing means rotatable about fastener element or rotatably engageable by tool-rotatable headed fastener element411/354Wedge-securing meansExaminersPrimary: Taylor, Dennis L.Attorney, Agent or FirmForeign Patent References
International ClassE21D 021/00AbstractAn anchor for a mine roof bolt incorporates a single large rib at the top of a segmented shell. This single large rib is forced into the wall of the bore hole by the downward movement of an associated threaded camming nut during the first few revolutions of the roof bolt. The remainder of the outer surface is generally smooth or unserrated and provides a large bearing surface which is urged against the bore hole wall upon further rotation of the bolt. The camming nut has a specific shape flaring substantially near its upper end such that a relative large area of the bore hole wall below the rib is forced into compression.Field of SearchRock or earth bolt or anchorWith settable material feature Breaking canister or packet Bolt having wedge expander Including sleeve and distinct tapered expander (e.g., anchor bolt type) Circumferential rib Having rotation preventing means Groove and follower Made up of plural expansible segments or sections Securing means rotatable about fastener element or rotatably engageable by tool-rotatable headed fastener element Wedge-securing means At least one of the formations comprises a surface eccentric to the longitudinal axis of the nuts | |
