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Expansion bail anchor and method

a technology of expansion bail and expansion anchor, which is applied in the direction of anchoring bolts, earthwork drilling and mining, mining structures, etc., can solve the problems of affecting the ability of the anchor assembly to properly expand and engage the rock formation, the tendency of the bail-type expansion anchor to bias and become cocked,

Inactive Publication Date: 2009-02-12
FCI HLDG DELAWARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bail-type anchors are traditionally difficult to use with chemical anchoring.
As the resin mixes and cures, the bail of traditional bail-type expansion anchors has a tendency to bias and become cocked, compromising the ability of the anchor assembly to properly expand and engage the rock formation.

Method used

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  • Expansion bail anchor and method
  • Expansion bail anchor and method
  • Expansion bail anchor and method

Examples

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Embodiment Construction

[0024]For purposes of the disclosure, the terms “upper”, “lower”, “right”, “left”, “vertical”, “horizontal”, “top”, “bottom” and derivatives thereof shall relate to the invention as it is oriented in the drawing figures generally. However, it is to be understood that the invention may assume various alternative variations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices and methods illustrated in the attached drawings and described in the written description are simply exemplary embodiments of the invention. Hence, specific dimensions and other physical and spatial characteristics related to the embodiments disclosed herein are not to be considered as unduly limiting the present invention.

[0025]Referring to the drawings, and particularly to FIGS. 1-4, there is shown a mine roof bolt 10 bearing a bail-type expansion assembly 12. The mine roof bolt 10 is shown inserted into a bore hole 14 surrounded by rock str...

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PUM

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Abstract

An expansion anchor assembly for a mine roof bolt having a tapered plug, expansion leaves, a bail and a removable holding ring configured to hold the expansion anchor assembly in an assembled position is disclosed. The tapered plug is configured to be threaded onto the mine roof bolt and defines plug channels to encourage symmetrical resin flow past the tapered plug. The bail defines a medial opening through which the mine roof bolt extends.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to expansion bail-type mine anchors and methods of their use.[0003]2. Description of the Prior Art[0004]In underground mining operations generally, unsupported rock formations may be reinforced by bolts inserted into bore holes that have been drilled into the rock formations. These bolts may then be secured within the bore hole to the rock formations by utilizing an expansion anchor positioned on the distal end of the bolt. The free end of the bolt extending into the mine passageway receives a bearing plate. Rotation of the bolt within the bore hole expands the expansion anchor to engage the rock surrounding the bore hole. The expansion of the expansion anchor brings the bolt under tension and further compresses the rock strata between the bearing plate and expansion anchor to form a beam of rock strata that resists forces that could stress the rock formations. Accordingly, expansion anchor...

Claims

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Application Information

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IPC IPC(8): E21D20/00
CPCE21D21/008E21D20/025
Inventor OLDSEN, JOHN G.STANKUS, JOHN C.BRANDON, DEMREY G.NOVAKOWSKI, MARK F.REILLEY, MICHAEL S.
Owner FCI HLDG DELAWARE