Boring or penetrating the earth – Below-ground impact members
Reexamination Certificate
2002-10-09
2009-12-01
Bomar, Shane (Department: 3676)
Boring or penetrating the earth
Below-ground impact members
C175S414000, C166S242600, C285S333000
Reexamination Certificate
active
07624822
ABSTRACT:
A thread joint for transmitting percussive forces includes a male thread on a male member and a female thread on a female member. The male member includes a first portion including an outer surface having a maximum first outer cross section, a second portion having a second maximum outer dimension, and a third portion having the male thread formed thereon. The second portion is disposed axially between the first and third portions. The male thread includes a thread start and a thread end. The third portion terminates in an axially facing first end surface. The female member has a recess in which the female thread is formed, the female thread having a mouth defined by a ring-shaped second end surface. The recess includes a cylindrical inner surface disposed between the second end surface and the female thread. The inner surface faces the cylindrical center portion of the male member. The inner surface has a diameter at least as large as the second maximum outer cross-sectional dimension, and smaller than the first maximum cross section. A first imaginary cylinder constituting an axial extension of the inner surface intersects the first portion of the male member, and a second imaginary cylinder constituting an axial extension of an outermost surface of the female member extends outside of the first portion of the male member.
REFERENCES:
patent: 3645570 (1972-02-01), Johansson et al.
patent: 4968068 (1990-11-01), Larsson
patent: 5785360 (1998-07-01), Nordfeldt et al.
patent: 6767156 (2004-07-01), Larsson
patent: 7185721 (2007-03-01), Carlstrom et al.
patent: 2002/0074797 (2002-06-01), Liljebrand et al.
patent: WO 82/03653 (1982-10-01), None
patent: WO 87/04487 (1987-07-01), None
Liljebrand Per-Olof
Olsson Urban
Olsson, legal representative Monica
Bomar Shane
Drinker Biddle & Reath LLP
Sandvik Intellectual Property AB
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