Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent
1976-12-02
1978-07-04
Shapiro, Jacob
Boring or penetrating the earth
Below-ground impact members
With releasable means to detachably retain telescoping...
37 81, 175171, 299 89, 408204, E21D 2100
Patent
active
040980871
ABSTRACT:
A method of, and bolt for, supporting a structure such as a mine or tunnel roof or side wall or the like. The method typically comprises providing an elongate annular anchoring bolt defining a central longitudinal passage therethrough and having cutting edges in an inwardly extending region at its leading end and in outwardly protruding areas at spaced positions along and around its outer surface for cutting into the structure to be supported, and openings in the bolt adjacent to at least some of the cutting edges for permitting material that is cut away from the structure to proceed into the central passage and out through its trailing end, the outer diameter of the bolt being smaller at its leading end and progressively larger along its length to the trailing end, pressing the leading end of the bolt against a surface of the structure to be supported, applying axial and rotational forces against the bolt to drive its cutting edges against and into the structure along approximately parallel helical paths and to penetrate into the hole formed by the cutting until only a short minor portion of the bolt remains outside of the structure, and then applying a final axial force against the bolt sufficient to upset inwardly a portion of the bolt at its leading end and to drive the remaining portion of the bolt at the trailing end into the hole.
REFERENCES:
patent: 2786284 (1957-03-01), Todd
patent: 2930199 (1960-03-01), Jarund
patent: 3250170 (1966-05-01), Siegel
Battelle Development Corporation
Bissell Barry S.
Dunson Philip M.
Shapiro Jacob
LandOfFree
Anchoring bolt and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Anchoring bolt and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anchoring bolt and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-271938