US546041A - Twist-drill - Google Patents
Twist-drill Download PDFInfo
- Publication number
- US546041A US546041A US546041DA US546041A US 546041 A US546041 A US 546041A US 546041D A US546041D A US 546041DA US 546041 A US546041 A US 546041A
- Authority
- US
- United States
- Prior art keywords
- drill
- axis
- twist
- center
- grooves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 210000000088 Lip Anatomy 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000006011 modification reaction Methods 0.000 description 4
- 230000000875 corresponding Effects 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/909—Having peripherally spaced cutting edges
- Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
- Y10T408/9097—Spiral channel
Definitions
- WITNESSES I l/vm mfl 4% fig .Q/ Z9 012M v Arm/Mm,
- the object of my invention is to produce a twist-d rill in which the true cut of the tool extends to its axis.
- I so modify the cross-sectional shape as to produce two outting-edges, one of which is of the usual character, but extends inward to the axis of the drill.
- the modification of cross-section consists in having one of the grooves extend to the axis, while the opposite one is of such shape as to leave a sufficiently substantial connection on that side of the axis between the two sides of the drill.
- FIG. 1 is a side view of a drill embodying my invention
- Fig. 2 an end view,and Fig. 3 a section, through any portion of the drill.
- Figs. 4, 5, and 6 are views, respectively, similar to Figs. 1 2, and 3, showing a somewhat modified form of my invention.
- Figs. 7 and 8 show sections of two other modifications embodying the sameinvention. Referring to Fig. 3, this section shows the drill to have two spirally-cut angular grooves,
- Figs. 4.,- 5, and 6 show a drill formed in a similar manner, except the shapes of the grooves are somewhat modified, so as to obtain a lighter drill, and illustrate how the circular relief indicated by lines o b and a d used in some of the present drills may also be obtained in my drill.
- Fig. 7 illustrates the accomplishment of my invention by two rectangular V-shaped grooves a 0 b and c n 01
- Fig.8 shows how the cutting-edges a O and c n may be radial without necessarily being diametrically opposite each other.
- the entire cuttingedge a 0 should be a straight line. It might also be a curve, provided it runs to the axis of the drill, and a practically sharp angle is procured there.
- Atwist drill having two grooves opposite each other, one groove being V-shaped and I In testimony whereof I have hereunto subhaving its apex in the axis of the drill. scribed my name.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Description
(No Model.) 7
0. TYBHRG. TWIST DRILL.
No. 546,041. Patented Sept .10, 1895.
WITNESSES: I l/vm mfl 4% fig .Q/ Z9 012M v Arm/Mm,
OLUF TYBERG, or BROOKLYN, NEW YORK.
TWI lST-DRI LL.
SPECIFICATION forming part of Letters Patent No. 546,041, dated September 10, 1895..
- Applica i n fi October 2, 189 Serial No. 524,748. (No model.)
To ctZZ whom it may concern.-
Be it knownthat I, OLUF TYBERG, a subject of the King of Denmark, residingin Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Twist-Drills, of which the following is a specification, reference being had therein to the accompanying drawings.
In twist-drills as heretofore made, so far as I am aware, neither of the cuttingedges extends to the axial center of the drill, and usually the two cutting-edges are tangential to a small circle of which the axis is the center. The center portion, therefore, of such drills must remove the stock by a crushing or scraping action only, resulting in a retardation of the feed and development of considerable frictional heat.
The object of my invention is to produce a twist-d rill in which the true cut of the tool extends to its axis. To this end I so modify the cross-sectional shape as to produce two outting-edges, one of which is of the usual character, but extends inward to the axis of the drill. The modification of cross-section consists in having one of the grooves extend to the axis, while the opposite one is of such shape as to leave a sufficiently substantial connection on that side of the axis between the two sides of the drill. I am aware that in twist-drills in which neither of the grooves extends to the axis it has been proposed to grind a chamfer on the stock connecting the two sides of the drill and to thus attempt to extend the cutting-edge to or closer to the axis. Such an operation is, however, difficult, requires a sharp-edged grinding wheel or tool, and is unsatisfactory in results. I am also aware that it has been proposed to make a twist-drill in which one of the grooves is extended beyond the axis, thus removing the central portion of the drill entirely. In such case a core corresponding to this central portion would remain in the center of the hole unless the hole be drilled entirely through the stock. Such a drill would be difiicult to start, not having a center, and it would be practically impossible to grind it. In the accompanying drawings, Figure 1 is a side view of a drill embodying my invention; Fig. 2 an end view,and Fig. 3 a section, through any portion of the drill. Figs. 4, 5, and 6 are views, respectively, similar to Figs. 1 2, and 3, showing a somewhat modified form of my invention. Figs. 7 and 8 show sections of two other modifications embodying the sameinvention. Referring to Fig. 3, this section shows the drill to have two spirally-cut angular grooves,
one of which a O b has its apex in the center or axis of the drill throughout its entire 5.
length, while the other groove 0 np' d is shaped so as to leave sufficient stock around the other portion of the center to connect the two sides of the drill which carry the cuttinglips or cutting-edges. These lips a 0 and c o are shown in Figs. 1 and 2. When grinding the drill and relieving the stock behind the lips, it is possible to grind in such a manner as to procure two perfect cutting-edges, both running directly to the axis of the drill, by removing the stock in front of the cuttingedge 0 0, as indicated in Fig. 1 byline o n. This, however, is not absolutely necessary, as it is sufficient if only'one cutting-edge a 0 runs directly to the center, which the shape of the groove a 0 b will always insure.
Figs. 4.,- 5, and 6 show a drill formed in a similar manner, except the shapes of the grooves are somewhat modified, so as to obtain a lighter drill, and illustrate how the circular relief indicated by lines o b and a d used in some of the present drills may also be obtained in my drill.
Fig. 7 illustrates the accomplishment of my invention by two rectangular V-shaped grooves a 0 b and c n 01 Fig.8 shows how the cutting-edges a O and c n may be radial without necessarily being diametrically opposite each other.
It is not essential that the entire cuttingedge a 0 should be a straight line. It might also be a curve, provided it runs to the axis of the drill, and a practically sharp angle is procured there.
I claim as my invention- 1. Atwist drill having two grooves opposite each other, one groove being V-shaped and I In testimony whereof I have hereunto subhaving its apex in the axis of the drill. scribed my name.
2. Atwist drill havin one groove shaped so 7 as to form an angle with its apex in the axis OLUF T1 BERG 5 of the drill, While another is so shaped as to Witnesses:
leave a substantial connection between the I FRANK S. OBER, two sides of the drill. 1 EDWARD O. DAVIDSON.
Publications (1)
Publication Number | Publication Date |
---|---|
US546041A true US546041A (en) | 1895-09-10 |
Family
ID=2614785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US546041D Expired - Lifetime US546041A (en) | Twist-drill |
Country Status (1)
Country | Link |
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US (1) | US546041A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2587980A (en) * | 1947-04-14 | 1952-03-04 | Nat Tool Salvage Company | Drill |
US3037329A (en) * | 1957-09-20 | 1962-06-05 | Cincinnati Milling Machine Co | Method and apparatus for grinding drills |
US4116580A (en) * | 1977-04-08 | 1978-09-26 | Mcdonnell Douglas Corporation | All cutting edge drill |
US4968193A (en) * | 1986-08-18 | 1990-11-06 | Black & Decker Corporation | Self-centering drill bit with pilot tip |
US5078554A (en) * | 1989-01-24 | 1992-01-07 | Masao Kubota | Drill |
US5288183A (en) * | 1986-08-18 | 1994-02-22 | Black & Decker Inc. | Self-centering drill bit with pilot tip |
-
0
- US US546041D patent/US546041A/en not_active Expired - Lifetime
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2587980A (en) * | 1947-04-14 | 1952-03-04 | Nat Tool Salvage Company | Drill |
US3037329A (en) * | 1957-09-20 | 1962-06-05 | Cincinnati Milling Machine Co | Method and apparatus for grinding drills |
US4116580A (en) * | 1977-04-08 | 1978-09-26 | Mcdonnell Douglas Corporation | All cutting edge drill |
US4968193A (en) * | 1986-08-18 | 1990-11-06 | Black & Decker Corporation | Self-centering drill bit with pilot tip |
US5288183A (en) * | 1986-08-18 | 1994-02-22 | Black & Decker Inc. | Self-centering drill bit with pilot tip |
US5078554A (en) * | 1989-01-24 | 1992-01-07 | Masao Kubota | Drill |
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