Drill bit with concave spurs and having triangular center point

Details Drill bit with concave spurs and having triangular center point Drill bit with concave spurs and having triangular center point

1991-04-05

1991-10-29

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

408213, 408225, B23B 5104

Patent

active

050611275

ABSTRACT:
An improved drill bit for wood boring or boring in other relatively soft material, having a generally cylindrical shaft (20), with a flattened blade portion at one end (24). The blade portion (24) is broad and flat with essentially parallel side surfaces (41, 42) and having negatively beveled edges along the length of such side surfaces, such side surfaces giving way to a modified end edge. The modified end edge includes a center point, with a length of one half to several times the thickness of the blade, and said point (34) is centered on the end edge and is made with a triangular shape with a vee groove from the center of the base to the middle of the vertex. (35). Outer spurs of rectangular cross section (29 and 30) with a concave tip and a negative bevel away from the leading edge are located on the lateral extremities of the end edge. Radially extending cutting surfaces (45 and 46) with a negative bevel away from the leading edge (37 and 38) extend at right angles from the base of the center point to the inside edge of the outer spurs.

REFERENCES:
patent: 124089 (1872-02-01), Shepardson
patent: 2543206 (1951-02-01), Smith
patent: 2627292 (1953-03-01), Kronwall
patent: 2689131 (1954-09-01), Priest
patent: 2782824 (1957-02-01), Robinson
patent: 2794468 (1957-06-01), Huxtable
patent: 3477481 (1969-11-01), Czerniewicz
patent: 3543820 (1970-12-01), Tulumello
patent: 3920350 (1975-11-01), Southall
patent: 3997279 (1976-12-01), Porter
patent: 4286904 (1981-09-01), Porter et al.
patent: 4480951 (1984-11-01), Regensburger
patent: 4878786 (1989-11-01), Hedgepeth
patent: 4950111 (1990-08-01), Thomas

Affiliated with

Also associated with

Rating

Drill bit with concave spurs and having triangular center point does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Drill bit with concave spurs and having triangular center point , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drill bit with concave spurs and having triangular center point will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1396282