Roof bolt with helical coil and bail anchor

Details Roof bolt with helical coil and bail anchor Roof bolt with helical coil and bail anchor

1989-06-15

1991-08-27

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Chemical

411902, E21D 2008

Patent

active

050429612

ABSTRACT:
A mine roof anchor assembly usable with a quick-setting resin cartridge inserted into a mine roof opening includes a partially threaded elongated bolt having a head at one end, a bail-type mechanical anchor at the threaded end, and an elongated helical coil having an upper end attached to the bolt and positioned external of and surrounding a substantial length along the bolt. A bearing plate and a two-faced washer can be positioned on the bolt head. Both sides of the washer may be coated with a dry lubricant such as graphite suspended in a resin base.

REFERENCES:
patent: 4100748 (1978-07-01), Hansen
patent: 4187040 (1980-02-01), Donan
patent: 4206060 (1980-06-01), Yamamoto et al.
patent: 4556344 (1985-12-01), White
patent: 4619559 (1986-10-01), Norris
patent: 4746248 (1988-05-01), Lillis et al.
patent: 4861198 (1989-08-01), Stankus
H. N. Maleki et al., "Tension-Torque Relationship for Mechanical Anchored Roof Bolts", Proceedings of the 4th Conference of Ground Control, 7-1987.
Anil Mahyera et al., "Controlled Thrust and Torque Placement of Mechanical Anchor Bolts And Their Relationship to Improved Roof Control", 7-1985.

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