US129543A - Improvement in merchantable bars for twist-drills - Google Patents
Improvement in merchantable bars for twist-drills Download PDFInfo
- Publication number
- US129543A US129543A US129543DA US129543A US 129543 A US129543 A US 129543A US 129543D A US129543D A US 129543DA US 129543 A US129543 A US 129543A
- Authority
- US
- United States
- Prior art keywords
- bar
- drills
- bars
- twist
- merchantable
- 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
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 210000000088 Lip Anatomy 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000126 substance Substances 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
- My invention consists of a metallic bar, of uniform thickness throughout, so shaped and twisted its entire length asto produce and leave on each of its sides a spiral groove of such a form as that one side, or half of each groove, will be radial, or nearly so, to the axis of said bar by presenting a straight line from a point near the center of the bar to its outer edge or circumference, and the other side or half of each groove be curvated by presenting a circular line from the inner edge of the straight portion outward to its periphery, the object being the construction of steel bars of such a character, condition, and shape as that, when cut transversely into sections, and one end of a section ground at the ordinary angle for such purposes and hardened, atwist-drill will be formed of a superior kind, cheaply, without forging or other process of manufacture.
- Figure- 1 represents a perspective "iew of my improved bar.
- Fig. 2 represents a trans.- vcrse section of the same;
- Fig. 3 a transverse section, enlarged for the purposes of explanation.
- my improved bar I take an ingot or thick piece of metal, preferably good cast-steel, and, after heating it to a suitable temperature, draw it down or reduce it, by
- This finished bar A has not only a spiral groove, B, on each side and its entire length, but is so shaped with respect to its transverse section as that one side, 0, or half of each groove, presents a straight line from a point, 0, near the center of the bar to its circumference D in the direction of, or parallel to, its radius, and the other side, F, of each groove 13 is curvated or presents a curved line from the central point e outward to the edges of the bar, which edges, or those parts P between the grooves B, are circumferential, or describe the arc of a regular circle, D.
- This bar gives it all the strength possible consistent with room sufficient forthe easy passage of the borings or cuttings, and carries with it its entire length those qualities that make it readily and easily adapted to the purposes for which it is intended.
- a metallic bar of uniform thickness throughout, so shaped and twisted its entire length as to produce and leave on each of its sides a spiral groove of such a form as that one side, or half of each groove, will be radial, or nearly so, to its axis of rotation by presenting a straight line from a point near the center of the bar to its outer edge or circumference, and the other side or half of each groovebe curvated by presenting a curved line from said central point to the periphery, substantially as shown and described, for the purposes set .forth.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Description
' J. w. ELL'S.
Improvement in Merchantable Bars for Twist-Drills..
Patented July 16,1872.
Inv 9111: or
PATENT QFFIGE.
JOSIAH W. ELLS, OF PITTSBURG, PENNSYLVANIA.
lMPROVEMENT IN MERCHANTABLE BARS FOR TWIST-DRILLS.
Specification forming part of Letters Patent No. 129,543, dated July 16, 1872.
Specification describing certain Improvements in Mcrchantable Bar-Steel, invented by JOSIAH W. ELLs, of Pittsburg, in the county of Allegheny and State of Pennsylvama.
My invention consists of a metallic bar, of uniform thickness throughout, so shaped and twisted its entire length asto produce and leave on each of its sides a spiral groove of such a form as that one side, or half of each groove, will be radial, or nearly so, to the axis of said bar by presenting a straight line from a point near the center of the bar to its outer edge or circumference, and the other side or half of each groove be curvated by presenting a circular line from the inner edge of the straight portion outward to its periphery, the object being the construction of steel bars of such a character, condition, and shape as that, when cut transversely into sections, and one end of a section ground at the ordinary angle for such purposes and hardened, atwist-drill will be formed of a superior kind, cheaply, without forging or other process of manufacture.
To enable others to make steel bars in accordance with my invention, I will proceed to describe their mode of construction and necessary shape by reference to the accompanying drawing, wherein Figure- 1 represents a perspective "iew of my improved bar. Fig. 2 represents a trans.- vcrse section of the same; Fig. 3, a transverse section, enlarged for the purposes of explanation.
To construct my improved bar I take an ingot or thick piece of metal, preferably good cast-steel, and, after heating it to a suitable temperature, draw it down or reduce it, by
successive steps or stages or repeated passages between properly-constructed rolls having grooves of gradually-diminishing size and requisite form, until it is brought to such a state and condition, with respect to external dimensions, as is best calculated to give it its general and final shape by the process or operation of twisting, which peculiar shape .is clearly indicated in the transverse sections represented by the drawing, Figs. 2 and 3, the twisting of the bar being accomplished by causing the reduction and shaping rolls to force it, as it leaves them in its last pass, through a die or guide so constructed, arranged, and made to operate with relation thereto as to give and produce in said bar a proper and desirable amount of spiral curvature, shown in the drawing, Fig. 1. This finished bar A has not only a spiral groove, B, on each side and its entire length, but is so shaped with respect to its transverse section as that one side, 0, or half of each groove, presents a straight line from a point, 0, near the center of the bar to its circumference D in the direction of, or parallel to, its radius, and the other side, F, of each groove 13 is curvated or presents a curved line from the central point e outward to the edges of the bar, which edges, or those parts P between the grooves B, are circumferential, or describe the arc of a regular circle, D.
,This construction or form of bar is such as to admit of its being cheaply and expeditious ly converted into twist-drills, 850., in the manner hereinbefore stated, regardless of whatever portion of the bar they may be taken from, so that the straight or radial sides 0 of each groove B will constitute the cutting parts of the drill and present a straight edge or lip to the metal or other substance being operated on, while the opposite or curved side F will gather and facilitate the discharge of the borings or chips. I
The form of this bar gives it all the strength possible consistent with room sufficient forthe easy passage of the borings or cuttings, and carries with it its entire length those qualities that make it readily and easily adapted to the purposes for which it is intended.
Claim.
I claim as a new, improved, and merchant able article of manufacture A metallic bar, of uniform thickness throughout, so shaped and twisted its entire length as to produce and leave on each of its sides a spiral groove of such a form as that one side, or half of each groove, will be radial, or nearly so, to its axis of rotation by presenting a straight line from a point near the center of the bar to its outer edge or circumference, and the other side or half of each groovebe curvated by presenting a curved line from said central point to the periphery, substantially as shown and described, for the purposes set .forth.
JOSIAH W. ELLS. Witnesses:
ED. M. JOHNSTON, B. WELDON.
Publications (1)
Publication Number | Publication Date |
---|---|
US129543A true US129543A (en) | 1872-07-16 |
Family
ID=2198961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US129543D Expired - Lifetime US129543A (en) | Improvement in merchantable bars for twist-drills |
Country Status (1)
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US (1) | US129543A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050163578A1 (en) * | 2002-04-03 | 2005-07-28 | Tbt Tiefbohrtechnik Gmbh + Co | Drilling device provided with a multi-bladed drilling tool, especially a deep drilling tool |
-
0
- US US129543D patent/US129543A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050163578A1 (en) * | 2002-04-03 | 2005-07-28 | Tbt Tiefbohrtechnik Gmbh + Co | Drilling device provided with a multi-bladed drilling tool, especially a deep drilling tool |
US7476066B2 (en) * | 2002-04-03 | 2009-01-13 | Tbt Tiefbohrtechnik Gmbh + Co. | Drilling device provided with a multi-bladed drilling tool, especially a deep drilling tool |
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