US 4,064,784 A · Drill tip and threaded fastener

Abstract

A drill tip formed from two elements, each being one-half of a concave-convex spade-like element, the elements being joined integrally, the elements presenting a cutting edge which is a continuous curve extending from one side of the tip to the other through the pilot end of the tip.

Drawings

Claims16

Dependent claims

A drill tip mounted on a shank comprising,

a pair of cutting elements,
each being one-half of a concave-convex spade-like element,
said elements being oppositely facing and integrally joined at the axis of said shank, the juncture of said elements forming a web in said tip,
each of said elements presenting an outboard curvilinear cutting edge which smoothly merges into said an arcuate pilot end, said curvilinear cutting edges and said arcuate pilot end forming a continuous curved cutting edge extending from one side of the shank to the diametrically opposite side thereof, said continuous cutting edge lying in a single plane generally parallel to the axis of said shank.

1 more element

Dependencies are inferred from the claim text.

Abstract

Drawings

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Drawings

Claims16

Dependent claims

A drill tip mounted on a shank comprising,

a pair of cutting elements,
each being one-half of a concave-convex spade-like element,
said elements being oppositely facing and integrally joined at the axis of said shank, the juncture of said elements forming a web in said tip,
each of said elements presenting an outboard curvilinear cutting edge which smoothly merges into said an arcuate pilot end, said curvilinear cutting edges and said arcuate pilot end forming a continuous curved cutting edge extending from one side of the shank to the diametrically opposite side thereof, said continuous cutting edge lying in a single plane generally parallel to the axis of said shank.

1 more element

Dependencies are inferred from the claim text.

Description2,848 words

Summary1,149 words

#This invention relates to a drill tip, and more particularly, the invention is directed to a drill tip for a drill screw.

#There are disclosures in the prior art of a wide variety of drill screw configurations and drill tips associated with the drill screws. Some of these are on the market. While there are a great many variations and configurations, generally they have certain common characteristics. At the pilot end of the screw, that is, the leading or front end of the screw, the end is configurated similarly to the pilot end of a twist drill. The pilot end has two cutting surfaces terminating in cutting edges. The cutting edges either come to a point or are slightly spaced from the axis of the screw and are interconnected by a chisel edge. The cutting edges form an angle usually about 118.degree., that is, each edge is at 59.degree. to the axis of the screw.

#A pair of flutes beginning at the cutting edges wind helically along the length of the shank for chip clearance. The shank has screw threads which begin rearwardly of the flutes. The threads have a greater diameter than the diameter of the drill tip and are adapted to be threaded into a metal plate after the drill portion of the screw has formed a hole.

Brief description of the drawings11 figures

#The several objectives and features of the invention will become more readily apparent from the following detailed description taken in conjunction with the accompanying drawings in which:

#FIG. 1 is a side elevational view of a drill screw having the drill tip of the present invention;

#FIG. 1A is an enlarged view of the encircled area of FIG. 1;

Detailed description1,490 words

#Referring to the drawings, a drill screw indicated at 10 has a head 11 at its rearward end, a shank 12 which is threaded at 13 and a drill tip 14 at its forward or leading end.

#While the drill tip 14 is shown in association with a drill screw, it is to be understood that the drill tip can be used in conjunction with other types of shanks as, for example, a plain, cylindrical shank, for the purpose only of forming holes in metallic plates.

#The head 11 as shown in FIGS. 1 and 2 is slotted as at 18 for receipt of a screw driver implement or bit chucked into a power drill. The screw can be fitted with any type of head suitable for use with and adapted to be received in a power drill for rotation by the power drill.

Drill tip and threaded fastener

Life of this patent

Abstract

Drawings

Claims16

Drill tip and threaded fastener

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims16

Description2,848 words

Drawings

Classification5 codes

Life of this patent

Description2,848 words