Self-drilling dowel with an inclined rolling head

Details Self-drilling dowel with an inclined rolling head Self-drilling dowel with an inclined rolling head

1977-12-20

1979-12-11

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Nonsymmetrical bit

175403, 85 68, 408205, 125 20, 145116R, F16B 1300

Patent

active

041778677

ABSTRACT:
A self-drilling dowel consists of a tubular-shaped member with a drilling head at one end. The drilling head is formed of a plurality of teeth each having a tip. The tip of the teeth are all disposed in a single plane inclined at an angle to the axis of the tubular-shaped member. A line perpendicular to the plane containing the tips of the teeth and intersecting the axis of the tubular-shaped member is disposed to the axis at an angle in the range of 4.degree. to 9.degree.. The teeth are formed by a cutter with its center located at an offset position from the axis of the tubular-shaped member. The feed line of the cutter extending through its center can be parallel to the axis of the tubular-shaped member or it can be set angularly to the axis of the tubular-shaped member in the range of 4.degree. to 9.degree. or 81.degree. to 86.degree. depending on whether the cutter is moved generally in the axial direction or transversely to the axial direction of the tubular-shaped member.

REFERENCES:
patent: 443072 (1890-12-01), Chapman
patent: 2606615 (1952-08-01), Pevey et al.
patent: 2827264 (1958-03-01), Sitton et al.
patent: 3204907 (1966-08-01), Mueller et al.
patent: 3467209 (1969-09-01), Chromy
patent: 3592554 (1971-07-01), Takahara

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