US953883A - Twist-drill. - Google Patents

Twist-drill. Download PDF

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Publication number
US953883A
US953883A US47692009A US1909476920A US953883A US 953883 A US953883 A US 953883A US 47692009 A US47692009 A US 47692009A US 1909476920 A US1909476920 A US 1909476920A US 953883 A US953883 A US 953883A
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United States
Prior art keywords
drill
twist
bar
shank
drills
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Expired - Lifetime
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US47692009A
Inventor
James Wing
Bernard O'reilly
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Individual
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Priority to US47692009A priority Critical patent/US953883A/en
Application granted granted Critical
Publication of US953883A publication Critical patent/US953883A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/005—Cylindrical shanks of tools
    • 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
    • Y10T408/907—Tool or Tool with support including detailed shank
    • 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
    • Y10T408/9098—Having peripherally spaced cutting edges with means to retain Tool to support

Definitions

  • This invention relates more particularly to drills which are constructed by twisting a flat (or approximately flat) bar of steel to the required helical shape and to a separable and interchangeable shank which may be common to a number of drills.
  • the chief object of the invention is economy, both in the manufacture, and also in the use of twist drills; the first being obtained by twisting the helical portion of the drill from a fiat or preferably grooved bar of steel, instead of cutting, grooving or milling the spiral grooves from a solid bar, or from a partially formed spiral bar; the second object namely economy in use by our improved construction, is found in the use of a separable interchangeable shank, by which in the case of broken or damaged drills the loss of a valuable shank portion is avoided, instead of it becoming scrap as in the ordinary twist drills.
  • Figure 1 represents a length of flat steel with a groove on each side, shown in the end view.
  • Fig. 2 the same bar with the grooved portion twisted into helical configuration.
  • Fig. 3 the separable shank, and end view of same.
  • the shank portion A, of the bar, Fig. 1 is left in its flat shape, but is made slightly tapering upon its edges A to conform to the Morse or other standard taper, and we also prefer to give a slight taper to the flat sides of same to a prearranged standard gage.
  • the part B, which is to be twisted may be fiat but as the result of experience Specification of Letters latent.
  • grooves down each of its fiat sides.
  • Such grooves are broad and shallow as shown in the end view Fig. 1, reaching from one edge of the bar (for example) to within a third of its width from the other edge, or thereabout, a-nd'becoming shallower toward the shank.
  • These grooves may be produced by rolling, milling, or other preferred process, and when the bar is twisted by the application of force applied in any approved manner, the grooves produce a cutting edge at the desired angle and leave the maximum of strength atthe back to sustain the torsional strain occurring during drilling.
  • the detachable shank is shown in Fig. 3; it is of tapered configuration to conform to the standard tapers of the several sockets in use, and is provided with a slightly tapered open side slot D, into which the tapering flat end of the drill will fit but leaving a vacant space between the end of the drill and the bottom of the slot D.
  • a twist drill comprising a flat bar having its lower portion twisted into helical form and having its upper portion fiat and slightly tapering upon its flat sides and edges, and an interchangeable shank having an open sided tapering recess to receive said upper portion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Description

J. WiNG & B. OREILLY. TWIST DRILL. APPLICATION FILED FEB. 9, 1909.
\ //v v5 70 P5 w/ TWESSES UNITED STATES PATENT OFFICE.
JAMES WING AND BERNARD OREILLY, OF SHEFFIELD, ENGLAND.
TWIST-DRILL.
T 0 all whom it may concern:
Be it known that we, JAMES WING and BERNARD OREILLY, subjects of the King of Great Britain and Ireland, residing at St. Marys lVorks, Penistone Road, Sheffield, county of York, England, have invented certain new and useful Improvements in Twist- Drills, (for which we have applied for Letters Patent in Great Britain, No. 161 13, dated July 30, 1908,) of which the following is a specification, reference being had to the accompanying drawing.
This invention relates more particularly to drills which are constructed by twisting a flat (or approximately flat) bar of steel to the required helical shape and to a separable and interchangeable shank which may be common to a number of drills.
The chief object of the invention is economy, both in the manufacture, and also in the use of twist drills; the first being obtained by twisting the helical portion of the drill from a fiat or preferably grooved bar of steel, instead of cutting, grooving or milling the spiral grooves from a solid bar, or from a partially formed spiral bar; the second object namely economy in use by our improved construction, is found in the use of a separable interchangeable shank, by which in the case of broken or damaged drills the loss of a valuable shank portion is avoided, instead of it becoming scrap as in the ordinary twist drills.
The sheet of drawings accompanying this specification illustrates our invention.
Figure 1, represents a length of flat steel with a groove on each side, shown in the end view. Fig. 2, the same bar with the grooved portion twisted into helical configuration.
Fig. 3, the separable shank, and end view of same.
The shank portion A, of the bar, Fig. 1, is left in its flat shape, but is made slightly tapering upon its edges A to conform to the Morse or other standard taper, and we also prefer to give a slight taper to the flat sides of same to a prearranged standard gage. The part B, which is to be twisted may be fiat but as the result of experience Specification of Letters latent.
Application filed February 9, 1909.
Patented Apr. 5, 1910.
Serial No. 476,920.
we prepare this part before twisting with a groove 0, down each of its fiat sides. Such grooves are broad and shallow as shown in the end view Fig. 1, reaching from one edge of the bar (for example) to within a third of its width from the other edge, or thereabout, a-nd'becoming shallower toward the shank. These grooves may be produced by rolling, milling, or other preferred process, and when the bar is twisted by the application of force applied in any approved manner, the grooves produce a cutting edge at the desired angle and leave the maximum of strength atthe back to sustain the torsional strain occurring during drilling.
The detachable shank is shown in Fig. 3; it is of tapered configuration to conform to the standard tapers of the several sockets in use, and is provided with a slightly tapered open side slot D, into which the tapering flat end of the drill will fit but leaving a vacant space between the end of the drill and the bottom of the slot D.
When placed in the socket of a drilling machine spindle, the drill is held perfectly true and secure.
We are aware that to produce the spiral part of drills by twisting the material to the desired form in contradistinction to cutting the grooves from the solid bar is not in itself novel, and we do not seek to claim such per 86.
Having now particularly described our said invention we declare that what we claim, is
A twist drill comprising a flat bar having its lower portion twisted into helical form and having its upper portion fiat and slightly tapering upon its flat sides and edges, and an interchangeable shank having an open sided tapering recess to receive said upper portion.
In witness whereof we have hereunto set our hands in presence of two witnesses.
JAMES WING. BERNARD OREILLY. VVitnesses':
Ensor. D. DRURY, BERNARD E. DRURY.
US47692009A 1909-02-09 1909-02-09 Twist-drill. Expired - Lifetime US953883A (en)

Priority Applications (1)

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US47692009A US953883A (en) 1909-02-09 1909-02-09 Twist-drill.

Applications Claiming Priority (1)

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US47692009A US953883A (en) 1909-02-09 1909-02-09 Twist-drill.

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US953883A true US953883A (en) 1910-04-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021005999A1 (en) 2021-12-04 2023-06-07 Mario von Cederstolpe Auger and method of making it

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021005999A1 (en) 2021-12-04 2023-06-07 Mario von Cederstolpe Auger and method of making it

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