US824346A - Twist-drill. - Google Patents

Twist-drill. Download PDF

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Publication number
US824346A
US824346A US25853005A US1905258530A US824346A US 824346 A US824346 A US 824346A US 25853005 A US25853005 A US 25853005A US 1905258530 A US1905258530 A US 1905258530A US 824346 A US824346 A US 824346A
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United States
Prior art keywords
drill
twist
shank
drills
holder
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Expired - Lifetime
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US25853005A
Inventor
Percy William Fawcett
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Individual
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Priority to US25853005A priority Critical patent/US824346A/en
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Publication of US824346A publication Critical patent/US824346A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/12—Adapters for drills or chucks; Tapered sleeves
    • B23B51/123—Conical reduction sleeves
    • 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
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17957—Friction grip
    • Y10T279/17965—Drill type

Definitions

  • This invention entitled Improvements in twist-drills, relates more particularly to the construction of the shank portion of such drills, which are sometimes parallel, but are usually made tapering to fit into holes of corresponding configuration either in chucks or other like holders for such tools, such drills when in use being carried round by frictional contact between the shank and the holder,
  • My invention is only applicable to twistdrills having such tapered shanks, and the chief objects I have in View are to obtain more perfect contact between the surfaces of the drill-shank and the holder; to avoid any rocking movement of the drill in the socket, and to reduce the area upon the shank, which requires the careful process of surface-grind- 111g.
  • Figure 1 is a front elevation
  • Fig. 2 is a front elevation
  • a twist-drill with tapering shank having the central portion of the shank reduced in diameter, as hereinbefore described and shown.

Description

1 No. 824,346. PATENTED JUNE 26, 1906.
P. W. PAWGETT.
TWIST DRILL.
APPLICATION FILED MAY 2,1905.
'FIG. I.
E7" Z0775. khl w W n0- Mag UNITED STATES PATENT OFFICE.
TWIST-DRILL.
Specification of Letters Patent.
Patented June 26, 1906.
Application filed May 2, 1905. Serial No. 258,530.
To all whom it may concern.-
Be it known that I, PERCY WILLIAM FAW- CETT, a subject of the King of Great Britain and Ireland, and a resident of Middlewood Hall, near Sheffield, county of York, England, have invented a certain new and useful Improvement in Twist-Drills, (for which I have applied for a patent in Great Britain, No. 11,781, dated May 24, 1904,) of which the following is a specification.
This invention, entitled Improvements in twist-drills, relates more particularly to the construction of the shank portion of such drills, which are sometimes parallel, but are usually made tapering to fit into holes of corresponding configuration either in chucks or other like holders for such tools, such drills when in use being carried round by frictional contact between the shank and the holder,
and it is therefore most important that the shanks of the drill should fit the holder accurately, and especially so at the o posite ends.
My invention is only applicable to twistdrills having such tapered shanks, and the chief objects I have in View are to obtain more perfect contact between the surfaces of the drill-shank and the holder; to avoid any rocking movement of the drill in the socket, and to reduce the area upon the shank, which requires the careful process of surface-grind- 111g.
The annexed drawings illustrate my said improvements.
Figure 1 is a front elevation, and Fig. 2
side view, of the shank portion of a twistdrill.
In carrying out my invention instead of making the shank A of the drill D of one continuous taper from end to end, I make the central portion B, which, for example, may be one-third, or thereabout, of its entire length, of reduced diameter, or, if desired, there may be more than one reduced part, the amount of hardened surface requiring to be carefully and accurately ground to size and to the correct angle, being thereby considerablyreduced. Also at the point of junction between the shank A and the body D of the drill I form an annular concave groove C to provide a clearance space between the line of the face of chuck or other drillholder and the drill, with the object of avoiding a right-angle junction or corner, and there fore preventing any tendency for the drill to snap at that point from side strain or the like.
Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is
A twist-drill with tapering shank, having the central portion of the shank reduced in diameter, as hereinbefore described and shown.
In witness whereof I have hereunto set my hand in presence of two witnesses.
PERCY WILLIAM FAWOETT.
Witnesses:
ROBERT F. DRURY, BERNARD E. DRURY.
US25853005A 1905-05-02 1905-05-02 Twist-drill. Expired - Lifetime US824346A (en)

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US25853005A US824346A (en) 1905-05-02 1905-05-02 Twist-drill.

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US25853005A US824346A (en) 1905-05-02 1905-05-02 Twist-drill.

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US824346A true US824346A (en) 1906-06-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989295A (en) * 1958-06-16 1961-06-20 Frank Prox Company Inc Cutter bit and holders and alignment means therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989295A (en) * 1958-06-16 1961-06-20 Frank Prox Company Inc Cutter bit and holders and alignment means therefor

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