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Self-seating-expansion-anchor

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Self-seating expansion anchor

Details

Inventors: White, Claude C.; White, Scott A.;
Assignee:
Primary Examiner: Taylor; Dennis L.
Assistant Examiner: Ricci; John
Attorney, Agent or Firm: Jennings, Carter, Thompson & Veal

An expansion anchor received within a predrilled bore for mounting a platelike panel to a portion of stratum in which the bore is drilled and including a bolt having a head on a lower end thereof, an upper portion, distal the head, defining a set of right hand threads thereon and a lower portion, intermediate the upper portion and the head, defining a set of left hand threads thereon. A destructible thrust nut having at least one groove therein is threadably connected to the lower portion and moves upwardly thereon when the rod is rotated in a clockwise direction. A cutting member, having an annular base supported by the thrust nut for sliding movement along the bolt and a plurality of cutting fingers connected to the base in divergent relation to the bolt, is urged upwardly by the thrust nut when the rod is rotated in the predetermined direction. The cutting fingers have at least one blade extending transversely thereon for cutting a groove in the stratum to expand the diameter of the bore a predetermined depth therein. An expansion nut is threadably connected to the upper portion and moves downwardly thereon to expand the cutting fingers and thereby direct the upwardly mobile cutting blades into the stratum. The downward motion of the expansion nut seats the fingers within the grooves cut thereby and secures the bolt within the bore. A rupturable resin container is provided to dispense catalyst activated resin within the bore to further secure the expansion anchor therein.

DETAILED DESCRIPTION It is the principal object of the present invention to provide an expansion anchor that will expand the diameter of a predrilled bore a predetermined depth therein.
In support of the principal object, another object of the present invention is to provide an expansion anchor that expands within the expanded portion of the bore to secure itself therein.
Yet another object of the present invention is to provide an expansion anchor that maximizes the cutting force exerted thereby.
Still another object of the present invention is to provide an expansion anchor that indicates when a predetermined amount of torquing force has been applied thereto.
These and other objects and advantages of our invention are accomplished through the use of an elongated bolt member having a polygonal head on a lower end thereof.
The bolt member has a set of right hand threads on an end thereof distal the head and a set of left hand threads intermediate the head and the right hand threads.
A thrust nut is threadably connected to the left hand threads and supports an annular base encircling the bolt member.
A plurality of cutting fingers are connected to the annular base and extend upwardly therefrom in divergent relation to the bolt member.
Each cutting finger has a cutting blade on an upper end thereof for cutting in substantially parallel relation to the longitudinal axis of the cutting finger.
An alternate embodiment provides for a plurality of parallel cutting edges extending substantially transverse the longitudinal axis of the cutting finger on an outer side thereof for cutting a groove substantially parallel such longitudinal axis.
An expansion nut is connected to the right hand threads and has a smaller end received intermediate the plurality of cutting fingers.
A plurality of planar surfaces are formed on the smaller end and are each contacted by a radially inward face of one of the plurality of cutting fingers.
The expansion anchor is typically inserted within a predrilled bore in a roof of a mine, such roof being the stratum through which said mine extends

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