The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 1986
Filed:
Oct. 23, 1985
Robert H Whittaker, Derry Township, Westmoreland County, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
Drilling apparatus for trepanning a difficult to work material. A drill member includes a very thin wall cylindrical cutting head integral with a shank portion, with the assembly being machined from the same piece of stock to insure concentricity. A fluid supply collar includes lower and upper Teflon washer inserts which surround the shank portions and which are held in place respectively by a shoulder of the cutting head and a chuck or other holder of a machine which rotates the drill member. Fluid supplied to the collar is directed through radial and axial passageways in the drill member to the lower margin thereof, and which lower margin includes a continuous abrading surface on the inside, outside and edge thereof. The length of shank extending from the holder is extremely short due to the dimension of the collar thereby resulting in high stiffness to insure for concentricity during drilling operations. A power down feed arrangement is provided so that the drill member is advanced into the workpiece at a predetermined constant rate.