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US1536208A - Expansible boring tool - Google Patents

Expansible boring tool Download PDF

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Publication number
US1536208A
US1536208A US2450A US245025A US1536208A US 1536208 A US1536208 A US 1536208A US 2450 A US2450 A US 2450A US 245025 A US245025 A US 245025A US 1536208 A US1536208 A US 1536208A
Authority
US
United States
Prior art keywords
tool
boring tool
expansible
spindle
boring
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
Application number
US2450A
Other languages
English (en)
Inventor
Gosper Amos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US2450A priority Critical patent/US1536208A/en
Application granted granted Critical
Publication of US1536208A publication Critical patent/US1536208A/en
Anticipated expiration legal-status Critical
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
    • B23B51/00—Tools for drilling machines
    • B23B51/0018—Drills for enlarging a hole
    • B23B51/0045—Drills for enlarging a hole by expanding or tilting the toolhead
    • 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
    • Y10T82/00—Turning
    • Y10T82/12—Radially moving rotating tool inside bore
    • Y10T82/125—Tool simultaneously moving axially
    • Y10T82/128—Pivoted to tool-carrier

Definitions

  • his invention- relates 'to an improved expansible boring tool for forming undercut holes in timber and other material, and it has been devised having for its principal object the provision of a boring tool that will accurately and expeditiously bore holes of uniform width for portion of their length but enlarged at their inner ends, while ,simultaneously with thaformation ofthe said enlarged portions counter-sinks are formed at the entrance ends of the holes. Holes so formed are used in the jointing o adjacent members in woodwork bythe use of trenails which are adapted to be expanded at their, end portions, and for various other purposes in joinery.
  • the invention provides an im roved expansible boring tool which is self-contained and furnished with means for stabilizing its operative integers, and means for synchronously returning the cutter and its control member to initial position immediately upon completion of boring.
  • Figure 1 is a perspective view of the improved expansible .boring tool.
  • Figure 2 is a vertical sectional view of the boring tool, showing the arrangement of its integers prior to boring.
  • Figure 3 is a vertical sect-ion showing the arrangement of the tool integers when that portion of the hole of'uniform width is being bored.
  • Figure 4 is a vertical section illustrating the integers of the tool when the lower eX- panded end of the hole isbeing bored and the entrance end of the hole is being countersunk.
  • the improved expansible boring tool comprises a cylindrical casing 2 tted with a screw-cap 3, and having an upper ball bearing 4 and a lower ballV bearing 5 for a spindle 6 which latter is a slidable fit in a 0F MARRICKVILLE, NEAR SYDNEY, NEW
  • a slotway 8 Formed in the lower end of said spindle 6 is a slotway 8, wherein is accommodated a control tongue.9, that is pivoted at its lower end upon a short pin 10 in said slotway.
  • This control ton e has a straight edge ortion 11, which oes not project eX- terior y of the spindle 6 and it is constructed having an upper end ortion 12 that inclines outwardly from said straight edge portion.
  • a tool-holder 13 is formed on, or may be afhxed to, the lowerl end of the pivoted control ton ue 9, and fitted in said toolholder is a oring tool or cutter 14 havin its op osite edges concaved and. thickene at its ower en
  • a bevelled cutting member 15 is formed on the. lower end of the said tool holder 13, and it serves to countersink the upper end of the hole being bored by the tool.
  • a thrust collar 16 Fitted around the spindle 6, beneath the upper ball-bearing 4 is a thrust collar 16 having fibre seating washers 17.
  • a coiled spring 18 encircles the spindle 6 and the upper end of the control tongue 9, and it is seated against the lower ball-bearing 5 and the washers 17 on the thrust collar 16.
  • the tang 7 is first connected to a drilling machine or the like, and the spindle 6 is rotated at comparatively highs eed and moved downwardly through the bearings 4 and 5 in the casing 2 against the tension of the coiled spring 18.
  • the boring tool or cutter 14 is thus brought against the work-piece and it bores a hole of predetermined depth and having uniform width, until such time as the outwardly projecting and inclined portion 12 of the pivoted control tongue 9 is forced inwardly into the slotway 8 by contact with the lower ball bearing 5-see Figure 4.
  • the tool holder 13 is moved slightly outwardly and the boring tool or cutter 14 is inclined to the axis ot the spindle 6 to progressively form a hole portion of increasing width at the lower end of 'the hole portion which is ofI uniform allwidth. Simultaneously with the outward' atI the lower end of the tool holder v13 bears.
  • the lower end of the cylindrical casing is, or mav be, provided having spikes 19 to grip t e work-piece,,and said easing may also be formed having milled portions 20 to enable a tight rip to be maintained upon the tool during oring operations.
  • dii'erent cutters 14 can be interchangeably fitted in the tool-holder 13 and that required adjustments can be made in the integers of the improved expansible boring tool whereby holes of different length and having varying degrees of undercut at their lower ends can be rapidly formed.
  • An expansible boring tool comprising, a casing, an upper and a lower ball-bearing in said casing, a spindle longitudinally movable in said ball-bearings, a slotway formedin said spindle, a tongue pivoted at its lower end in said slotway, an outwardly ⁇ said tongue hobos adapted to contact with the lower ball-bearing when a hole of uniform width of required depth has been bored ⁇ and thus cle-align said cutting tool to undercut the hole and complete the boring operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
US2450A 1925-01-14 1925-01-14 Expansible boring tool Expired - Lifetime US1536208A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US2450A US1536208A (en) 1925-01-14 1925-01-14 Expansible boring tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US2450A US1536208A (en) 1925-01-14 1925-01-14 Expansible boring tool
GB11578/25A GB244333A (en) 1925-05-04 1925-05-04 An improved expansible boring tool

Publications (1)

Publication Number Publication Date
US1536208A true US1536208A (en) 1925-05-05

Family

ID=9988806

Family Applications (1)

Application Number Title Priority Date Filing Date
US2450A Expired - Lifetime US1536208A (en) 1925-01-14 1925-01-14 Expansible boring tool

Country Status (4)

Country Link
US (1) US1536208A (de)
DE (1) DE460098C (de)
FR (1) FR597704A (de)
GB (1) GB244333A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2433976A (en) * 1946-07-09 1948-01-06 Aldrich C Babka Cutting tool
US2495583A (en) * 1945-03-28 1950-01-24 Hugh D Heron Boring tool
US2594671A (en) * 1948-01-27 1952-04-29 Mctyre Henry Internal reverse taper reamer
US3299748A (en) * 1965-03-22 1967-01-24 Sven L Moller Drilling tools
US3661473A (en) * 1969-12-22 1972-05-09 Burr Ban Tool Service Co Extension tool holder
EP0641616A1 (de) * 1993-09-06 1995-03-08 Fischerwerke Arthur Fischer GmbH & Co. KG Bohrvorrichtung zur Herstellung von Bohrlöchern mit Hinterschneidung
EP0729802A1 (de) * 1995-02-28 1996-09-04 Kabushiki Kaisha Miyanaga Bohrer zum Bohren unterschnittener Löcher
US5810523A (en) * 1995-02-28 1998-09-22 Kabushiki Kaisha Miyanaga Apparatus for drilling a hole having an undercut space

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH272338A (de) * 1949-03-01 1950-12-15 Utilis Muellheim Werkzeug & Ap Innenfräser.
CN107983991B (zh) * 2017-12-06 2020-01-10 天津工业大学 一种芳纶纤维增强复合材料钻削装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495583A (en) * 1945-03-28 1950-01-24 Hugh D Heron Boring tool
US2433976A (en) * 1946-07-09 1948-01-06 Aldrich C Babka Cutting tool
US2594671A (en) * 1948-01-27 1952-04-29 Mctyre Henry Internal reverse taper reamer
US3299748A (en) * 1965-03-22 1967-01-24 Sven L Moller Drilling tools
US3661473A (en) * 1969-12-22 1972-05-09 Burr Ban Tool Service Co Extension tool holder
EP0641616A1 (de) * 1993-09-06 1995-03-08 Fischerwerke Arthur Fischer GmbH & Co. KG Bohrvorrichtung zur Herstellung von Bohrlöchern mit Hinterschneidung
EP0729802A1 (de) * 1995-02-28 1996-09-04 Kabushiki Kaisha Miyanaga Bohrer zum Bohren unterschnittener Löcher
US5735650A (en) * 1995-02-28 1998-04-07 Kabushiki Kaisha Miyanaga Drill bit for drilling an undercut hole
US5810523A (en) * 1995-02-28 1998-09-22 Kabushiki Kaisha Miyanaga Apparatus for drilling a hole having an undercut space

Also Published As

Publication number Publication date
FR597704A (fr) 1925-11-27
DE460098C (de) 1928-05-21
GB244333A (en) 1925-12-17

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