Leo M Linthicum
Electrician at Collins Rd, Colorado Springs, CO
License number
Colorado 797
Issued Date
Feb 19, 1969
Renew Date
Mar 1, 2001
Expiration Date
Feb 28, 2003
Type
Master Electrician
Address
Address
1088 Collins Rd, Colorado Springs, CO 80920
Personal information
See more information about Leo M Linthicum at radaris.comName
Address
Phone
1088 Collins Rd, Colorado Springs, CO 80920
Professional information
Hole Enlargement Apparatus
US Patent:
6305885, Oct 23, 2001
Filed:
Jun 26, 2000
Appl. No.:
9/603100
Inventors:
Leo Linthicum - Colorado Springs CO
International Classification:
B23B 3500, B23B 5104
US Classification:
408 1R
Abstract:
A hole enlargement apparatus which uses a simple spring biased disc to center a larger hole cutter in the existing hole and a disc retention means to ensure that the disc does not fall unretrievably into the enlarged hole. The apparatus is used in conjunction with a conventional large hole cutter of the type having a toothed cylindrical cup, a hub axially secured in a bottom portion of the cup, and a pilot bit axially and removably secured through the hub and cup. The hole enlargement apparatus comprises: a guide member having a disc portion dimensioned to matingly fit within the existing hole, a rim portion connected to a rear portion of the disc portion adapted to seat on the workpiece, and a disc center guide opening dimensioned to slidingly accept a shaft the diameter of the pilot bit; a drill bit replacement shaft having a hub end portion and an opposite disc end portion; a cotter pin carried by the disc end portion of the drill replacement shaft to prevent the guide member from sliding off the disc end portion of the shaft; and, a spring to bias and maintain the disc portion in the existing hole.