DE19707428A1 - Jig for centre boring of broken off threaded shaft i.e. bolt - Google Patents

Jig for centre boring of broken off threaded shaft i.e. bolt

Info

Publication number
DE19707428A1
DE19707428A1 DE19707428A DE19707428A DE19707428A1 DE 19707428 A1 DE19707428 A1 DE 19707428A1 DE 19707428 A DE19707428 A DE 19707428A DE 19707428 A DE19707428 A DE 19707428A DE 19707428 A1 DE19707428 A1 DE 19707428A1
Authority
DE
Germany
Prior art keywords
broken
jig
screw
bolt
thread
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.)
Granted
Application number
DE19707428A
Other languages
German (de)
Other versions
DE19707428C2 (en
Inventor
Zbigniew Jablonski
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.)
Jablonski Zbigniew 50127 Bergheim De
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 DE19707428A priority Critical patent/DE19707428C2/en
Publication of DE19707428A1 publication Critical patent/DE19707428A1/en
Application granted granted Critical
Publication of DE19707428C2 publication Critical patent/DE19707428C2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
    • B23B47/28—Drill jigs for workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2247/00—Details of drilling jigs
    • B23B2247/12—Drilling jigs with means to affix the jig to the workpiece

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

The jig (1) comprises one piece and has a central hole to align the drill bit (4). One end has a male thread to screw into the hole containing the broken shaft. If the shaft is broken off outside the threaded hole then the jig is reversed and a female thread is secured over the broken shaft. The jig enables a central hole to be bored into the broken shaft. This can be threaded with a left hand thread and the broken section pulled out using the left hand thread.

Description

Es ist bekannt, daß das Herauslösen einer abgebrochenen Schraube bzw. eines Gewindebolzen verursacht in der Praxis größere Probleme. Es gibt zwar im Handel Hilfswerkzeuge wie Linksdreher (Schraubenausdreher), jedoch muß zuerst die zu entfernende Schraube angebohrt werden. Ein zentrisches Bohren mit der Handbohrmaschine ist fast unmöglich, auch unter Zuhilfenahme eines Körners. Es resultiert meistens bei kleineren Schrauben eine Beschädigung der Gewindegänge. Es verbleibt danach nur noch eine Vergrößerung des Gewinde- Nenndurchmessers.It is known that loosening a broken screw or a threaded bolt causes larger in practice Problems. There are auxiliary tools such as Left-handed (screw extractor), but first the removing screw are drilled. A centric one Drilling with the hand drill is almost impossible, even under Using a grain. It usually results in smaller ones Screw damage to the threads. It remains after that only an increase in the nominal thread diameter.

Dieses vorgenannte Problem wird mit der Maßnahme des Anspruchs 1 gelöst.This aforementioned problem is solved with the measure of claim 1 solved.

In den seltensten Fällen liegt die abgescherte (tordierte) Bruchfläche einer Schraube bündig zur Körperkante (Abbildung "A" und "B"). Sie befindet sich darüber oder darunter, d. h., je nach Abbruchart verbleiben 1-2 Gewindegänge. Diese werden zur Anbringung der Bohrvorrichtung genutzt.In the rarest of cases is the sheared (twisted) Fracture surface of a screw flush with the edge of the body (Figure "A" and "B"). It is above or below, i.e. that is, depending on There are 1-2 thread turns left. These become Attachment of the drilling device used.

Es genügt, die Bohrvorrichtung anzubringen um ein zentrisches Bohren zu erzielen. It is sufficient to attach the drilling device around a central one To achieve drilling.  

Die Abbildung der Erfindung zeigt eindeutig eine Vorrichtung zum Entfernen einer abgebrochenen Schraube deren Stumpf weit hinter der Gewindeeingangsfläche zurück steht. Die durch das US-PS 2,281,164 geschützte Vorrichtung, besteht aus einer Gewindehülse die außen Rechts- und innen Linksgewinde hat, und aus einem Gewindestift der auf der Druckseite Schneidekerben hat.The illustration of the invention clearly shows a device to remove a broken screw its stump wide behind the thread entry surface. The through that US Patent 2,281,164 protected device, consists of a Threaded sleeve that has a right-hand thread on the outside and left-hand thread on the inside, and from a grub screw on the pressure notches on the pressure side Has.

Wie abgebildet, wird zuerst die Gewindehülse Fig. 3 eingeschraubt, danach der Gewindestift Fig. 4 in die Hülse links eingedreht bis sich die Kerben 13-14 Fig. 5 in den Schraubenstumpf eingefräst haben. Danach wird der verbliebene Stumpf aus dem Werkstück entfernt.As shown, the threaded sleeve Fig. 3 is first screwed in, then the set screw Fig. 4 is screwed into the sleeve on the left until the notches 13-14 Fig. 5 have milled into the screw stump. The remaining die is then removed from the workpiece.

Solche Abbruchfälle wie in der Fig. 1 dargestellt, sind in der Praxis sehr selten, bzw. kommen in der Regel nicht vor.Such cases of termination as shown in FIG. 1 are very rare in practice, or do not usually occur.

Die Erfindung ist nicht gleich mit der von mir angemeldeten Bohrvorrichtung.The invention is not the same as the one I registered Drilling device.

Claims (1)

Variable Bohrvorrichtung für zentrisches Bohren, zur Entfernung defekter und/oder abgebrochener Schrauben bzw. Gewindebolzen, dadurch gekennzeichnet, daß die Bohrvorrichtung aus einem Stück besteht, wobei die eine Seite mit Innengewinde, die andere Seite mit Außengewinde und in der Mitte eine Bohrführung ausgeführt ist, um eine zentrische Bohrung in der abgebrochenen Schraube bzw. dem Gewindebolzen zu erreichen. Mit Hilfe eines handelsüblichen Linksdreher (Schraubenausdreher) wird der Abbruch herausgedreht.Variable drilling device for centric drilling, for removing defective and / or broken screws or threaded bolts, characterized in that the drilling device consists of one piece, one side with an internal thread, the other side with an external thread and a drilling guide in the middle, to achieve a central bore in the broken screw or threaded bolt. Using a commercially available left-handed screwdriver, the demolition is unscrewed.
DE19707428A 1996-04-01 1997-02-25 Centering tool for centering a drill bit, usable for the removal of defective or broken screws, threaded bolts or the like. Expired - Lifetime DE19707428C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19707428A DE19707428C2 (en) 1996-04-01 1997-02-25 Centering tool for centering a drill bit, usable for the removal of defective or broken screws, threaded bolts or the like.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29606049U DE29606049U1 (en) 1996-04-01 1996-04-01 Variable drilling device for central drilling, for removing defective and / or broken screws or threaded bolts
DE19707428A DE19707428C2 (en) 1996-04-01 1997-02-25 Centering tool for centering a drill bit, usable for the removal of defective or broken screws, threaded bolts or the like.

Publications (2)

Publication Number Publication Date
DE19707428A1 true DE19707428A1 (en) 1997-10-02
DE19707428C2 DE19707428C2 (en) 1998-07-30

Family

ID=8022034

Family Applications (2)

Application Number Title Priority Date Filing Date
DE29606049U Expired - Lifetime DE29606049U1 (en) 1996-04-01 1996-04-01 Variable drilling device for central drilling, for removing defective and / or broken screws or threaded bolts
DE19707428A Expired - Lifetime DE19707428C2 (en) 1996-04-01 1997-02-25 Centering tool for centering a drill bit, usable for the removal of defective or broken screws, threaded bolts or the like.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE29606049U Expired - Lifetime DE29606049U1 (en) 1996-04-01 1996-04-01 Variable drilling device for central drilling, for removing defective and / or broken screws or threaded bolts

Country Status (1)

Country Link
DE (2) DE29606049U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105835002A (en) * 2016-04-29 2016-08-10 湘电风能有限公司 Fractured bolt withdrawing device
DE102018007607A1 (en) * 2018-09-26 2020-03-26 Thomas Rothe Device and method for non-destructive dismantling of a threaded sleeve

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29705347U1 (en) * 1997-03-25 1997-05-15 Jablonski, Zbigniew, 50859 Köln Center drill bushing which can be attached by means of a press stroke to make holes in flush-cut / twisted screws or threaded bolts in order to remove them
DE102005042619A1 (en) * 2005-09-07 2007-03-08 Udo Starke Guide screw for correct fitting of drill to remove screw stubs has boring to act as guide for drill and is screwed into remaining usable threads above break-off point
CN103551630A (en) * 2013-10-16 2014-02-05 山推工程机械股份有限公司 Combined drilling jig and use method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2281164A (en) * 1941-02-19 1942-04-28 Howard S Maling Device for removing broken studs
US2408450A (en) * 1944-03-24 1946-10-01 V Ray Van Wey Broken stud remover

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2281164A (en) * 1941-02-19 1942-04-28 Howard S Maling Device for removing broken studs
US2408450A (en) * 1944-03-24 1946-10-01 V Ray Van Wey Broken stud remover

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105835002A (en) * 2016-04-29 2016-08-10 湘电风能有限公司 Fractured bolt withdrawing device
DE102018007607A1 (en) * 2018-09-26 2020-03-26 Thomas Rothe Device and method for non-destructive dismantling of a threaded sleeve
DE102018007607B4 (en) 2018-09-26 2022-02-17 Thomas Rothe Device and method for non-destructive dismantling of a threaded sleeve

Also Published As

Publication number Publication date
DE29606049U1 (en) 1996-06-13
DE19707428C2 (en) 1998-07-30

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8364 No opposition during term of opposition
8320 Willingness to grant licences declared (paragraph 23)
8327 Change in the person/name/address of the patent owner

Owner name: JABLONSKI, ZBIGNIEW, 50127 BERGHEIM, DE

R071 Expiry of right