Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent
1998-01-16
2000-07-04
Lillis, Eileen Dunn
Boring or penetrating the earth
With tool shaft detail
Helix or helically arranged structure
175394, E21B 1044
Patent
active
060824727
ABSTRACT:
An earth displacement drill is provided including a drill tube which can be driven for rotary movement and a boring tip connected thereto, wherein the boring tip has a cylindrical part which adjoins the drill tube and has at least two helical strips uniformly distributed around the circumference, which climb upwardly at a shallow angle, with the flat side of the strips preferably extending substantially parallel to the radius at the relevant position and in particular only over a fraction of the circumference of the cylindrical part. The boring tip also has a tapering part located beneath the cylindrical part and having at least two arched surfaces which are uniformly distributed around the tapering part. These arched surfaces expediently extend approximately parallel to the vertical and preferably more steeply than the helical strips. Moreover, they preferably extend only over a fraction of the periphery of the tapered part and terminate radially outwardly at least in the vicinity of the start of an associated helical strip. Such an earth displacement drill is improved in that the arched surfaces have lower edges which adjoin flat helical surfaces in a substantially step-free manner. The flat helical surfaces extend continuously to the lower edge of the cylindrical part and to the upper edge of the following arched surface as viewed opposite to the direction of rotation. The flat helical surfaces in each case form a step with the following arched surface as viewed opposite to the direction of rotation.
REFERENCES:
patent: D183237 (1958-07-01), Aven
patent: 3703214 (1972-11-01), Boehm et al.
patent: 4623025 (1986-11-01), Verstraeten
patent: 4949795 (1990-08-01), McDonald et al.
Fundex N.V.
Kreck John
Lillis Eileen Dunn
LandOfFree
Earth displacement drill does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Earth displacement drill, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Earth displacement drill will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1477770