Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1979-10-22
1981-10-20
Holko, Thomas J.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
411 33, 411 75, E21D 2100, F16B 1304
Patent
active
042957605
ABSTRACT:
A series of adjoining cam discs are mounted on a foot having an inclined surface, with the cams surrounding a stem connecting the foot and a head of a diameter to fit within a borehole in rock. The stem extends axially between the head and the foot, while the inclined surface is spaced from the head and is inclined with respect to the axis of the anchor. The head has threads for receiving corresponding threads on a bolt which extends through the foot and stem, while the flat cam discs have a width less than, and a length greater than, the diameter of the borehole. The anchor is moved into the borehole and the cam discs are caused to engage the wall of the borehole, the bolt then being turned to thread the head against the cam discs and force the ends of the cam discs against or into the wall. In one form, the stem has flat sides and apertures in the cam discs have corresponding flat sides, to prevent rotation between the cam discs and the stem, while a non-rotation disc may be mounted on the stem between the cam discs and the inclined surface. This non-rotation disc also has flat inner sides to engage the stem, to stop rotation of the cam discs and stem when the anchor begins to turn with the bolt, after the anchor has been pulled downwardly into the borehole to set the cam discs. In another form, the bolt is rotated to rotate the cams at a sufficient speed to cause then, through centrifugal force, to move toward a position perpendicular to the anchor and thereby engage the bore wall. The inclined surface of the foot engages the cam disc remote from the head to retard movement thereof and also pull it toward the cam discs. Upon further rotation of the bolt, the head is pulled against the cam discs to force the ends thereof against or into the wall. A spiral lock washer may be placed between the head and the cam discs. Other features are also disclosed.
REFERENCES:
patent: 211253 (1879-01-01), Norris
patent: 1212298 (1917-01-01), Weston
patent: 1407570 (1922-02-01), Peirce
patent: 2842999 (1958-07-01), Huston
patent: 2918840 (1959-12-01), Roesler
patent: 3192822 (1965-07-01), Genter
patent: 3727901 (1973-04-01), Textrom
patent: 4011787 (1977-03-01), White et al.
patent: 4037384 (1977-07-01), Molyneux
patent: 4147458 (1979-04-01), Elders
Holko Thomas J.
Law Richard D.
Van Valkenburgh Horace B.
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