Daniel J Groot

US Patent:

6511266, Jan 28, 2003

Filed:

May 2, 2001

Appl. No.:

09/847687

Inventors:

Daniel J. Groot - Tampa FL 33629

International Classification:

B23B 3500

US Classification:

408 1R, 408 97, 408113, 408115 B, 408127, 408200

Abstract:

Holes can be cut squarely through obstructions hidden within a hollow wall by apparatus that may include a flexible guide tube having a work-engaging head at one end; a collared lead screw or other arrangement for bringing the work-engaging head into perpendicular engagement with an obstruction; and a cutting tool for cutting the hole. In a some versions of the invention, two work engaging heads are coaxially attached to the end of the guide tube, inserted into the wall through an access hole, and used to sequentially cut holes through two obstructions. An advantage of this arrangement is that the second, smaller, hole has a large enough diameter to be used for feeding most sorts of flexible lines through the wall. In addition, a panel protecting apparatus is provided so that extensive work can be done within the wall without damaging the margins of the access hole.

US Patent:

20140361028, Dec 11, 2014

Filed:

Jun 11, 2014

Appl. No.:

14/301449

Inventors:

DANIEL J. GROOT - CLEARWATER FL, US

International Classification:

F16L 55/115

US Classification:

220806

Abstract:

A generally cylindrical base () has an upper cylindrical recess (), a lower cylindrical recess () with a diameter less than the diameter of the base to form an annular bearing surface (), and J-shaped locking notches (). An elastomeric sealing member () is positioned within the upper recess in sealing contact with the bearing surface. A pin () extends through the sealing member with end ears () positionable in the J-shaped locking notches for locking and sealing.