EP0940228B1 - Extracteur de goujons - Google Patents

Extracteur de goujons Download PDF

Info

Publication number
EP0940228B1
EP0940228B1 EP99104364A EP99104364A EP0940228B1 EP 0940228 B1 EP0940228 B1 EP 0940228B1 EP 99104364 A EP99104364 A EP 99104364A EP 99104364 A EP99104364 A EP 99104364A EP 0940228 B1 EP0940228 B1 EP 0940228B1
Authority
EP
European Patent Office
Prior art keywords
screw
flank
extractor
stump
notch
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
EP99104364A
Other languages
German (de)
English (en)
Other versions
EP0940228A2 (fr
EP0940228A3 (fr
Inventor
Reiner Ranft
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.)
Robert Schroeder GmbH and Co KG
Original Assignee
Robert Schroeder GmbH and Co KG
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 Robert Schroeder GmbH and Co KG filed Critical Robert Schroeder GmbH and Co KG
Publication of EP0940228A2 publication Critical patent/EP0940228A2/fr
Publication of EP0940228A3 publication Critical patent/EP0940228A3/fr
Application granted granted Critical
Publication of EP0940228B1 publication Critical patent/EP0940228B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/18—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same withdrawing broken threaded parts or twist drills

Definitions

  • the invention relates to screw extractors according to the preamble of claim 1.
  • screw extractors are known from DE-PS 625 735.
  • Such a screw extractor tries to from the torn screw stump by means of oversized chip detection to produce a rotary joint. You go from the consideration that an oversized chip detection too a tight fit of the tool in the screw stump.
  • a screw extractor assumed the screw-in zone to a pinching Deformation of the edge of the hole in the screw stump leads to so long until the torque-increasing measures Rotational blockage of the screw extractor achieved in its bore becomes.
  • the advantage of the invention is that the thread core diameter almost completely or completely preserved remains so that the one at risk of torsional fracture Place of the screw extractor not or only insignificantly is weakened.
  • the invention is to be distinguished from so-called Chip drainage channels, as usual with taps and are known.
  • the invention is based on the fact that only one local chip removal in the area of the screwed-in screwing zone not happened.
  • the squeezing flank of the notch runs flat, so to speak into the threaded zone in the screw zone Screw stump on. This takes place at most slight plastic deformation of the inner edge areas in the Screw stump where the further squeezing flanks are then finalize.
  • the main direction of loading is in the screw stump practically in the circumferential direction as soon as the crushing edges have reached a certain impression depth.
  • the crushing flanks therefore do not lead to cutting to a upsetting effect, which is ultimately a perimeter stop in the screw stump.
  • the perimeter stop is formed between the crushing flank and the compressed one Counter surface in the screw stump.
  • the circumference stops at a reduced screwing depth of the screw extractor a torsionally rigid connection between screw extractor and Screw stump.
  • the crushing edges are mainly from the triangular surfaces of the cut turns, with their tips immediately after approaching the Work the screw stump into the material of the screw stump. Larger areas of the area are becoming increasingly common Triangular surfaces in the pressure position, so that very short angles of rotation be covered until they are fixed.
  • The is essential for the invention Combination of a variety of close to each other, preferably immediately adjacent triangular surfaces in connection with a rake angle that is not less than 70 degrees and not should be greater than 110 degrees.
  • a rake angle that is taken into account is preferred the manufacturing tolerances should be 90 degrees.
  • Tightly adjacent triangular surfaces in the sense of the present Registration are those whose width at the foot is greater than is the distance between two adjacent triangular surfaces.
  • a such a constellation is obtained through a multi-course Pointed thread, the individual turns of which are practically immediate lie next to each other without the foot areas of the Coils of flat zones with the core diameter at the respective Thread point occur.
  • This combination therefore leads primarily to the desired crushing effect, because the triangular cross sections of the individual threads of the thread with increasing broadening of your Dig the front surface into the material of the screw stump. This creates an at least three-dimensional plastic one Deformation of the material of the screw stump caused by sole chip formation cannot be described.
  • the outer geometry of the screw extractor remains obtained in principle according to the present invention. It will only longitudinal recesses running across the turn removed from the screw-in zone.
  • the recess depth affects the polar section modulus the remaining cross section practically not or only slightly.
  • Chip formation should be avoided in any case in order to a defined state of engagement between the crushing flank and Screw stump to come.
  • the invention uses the basic idea that with The screw extractor is increasingly drawn into the screw stump larger diameter areas of the screw zone in the Hole in the screw stump. To this The turned core is expanded in this way axial bore while maintaining a relative twist between screw extractor and screw stub.
  • this inner edge zone now runs Effect the pinch edge in and will -da it has the higher hardness - in the material of the screw stump push in circumferentially.
  • the squeeze edge therefore causes a combinatorial Effect due to disproportionate deformation of the axial bore, because in addition to the deforming effect of the screw-in zone in the radial direction also in the circumferential direction local deformation. It therefore arises from one certain screw-in depth a torsionally rigid rotating connection piece, which is only on the outer circumference of the torn off Screw stub is held during the breakaway torque over the screw extractor into the rotating connection piece is initiated.
  • the defined torsionally rigid connection between Screw extractor and screw stub can be done this way easily the breakaway torque of the torn screw stump can be reached, so that the screw stump is easy can be turned out of its threaded seat.
  • the notch to lay only on the basic diameter of the turns and especially when unscrewing screws with a small diameter, e.g. for screws up to 8 mm, the notches no deeper than about 2/3 of the tooth height of the turns.
  • the optimal depth of the notch can also be the angle between the crushing flank and the tangent to be varied on the peripheral edge of the squeeze flank that the greatest possible burial effect without peeling effect on the axial bore.
  • the squeezing flank should preferably be counter to the screwing direction of the screw extractor backwards or in The screwing direction can be moved to the front in the center. This leads to an increased digging effect and also with crushed edges, the cutting effect due to its angular geometry would have to the primary burial effect. In each Trap should be the formation of chips in the screw stump be avoided.
  • the off-center offset to the front or to the rear should at most be so large that the Angle between the crushing flank and the tangent to the Circumferential edge of the crushing flank not less than 70 degrees and no greater than 110 degrees.
  • Such squeezing flanks can e.g. with side milling cutters getting produced. You can run the entire length of the Screw-in zone run or only locally. By using it the indentations run from disc milling cutters their axial lower and upper ends into those there Turns out. Nevertheless, the desired effect is without achieved further. Because the local upsetting of the screw stump due to the running crushing edge in the 1/10 mm range is, in principle, it is not necessary either Notch run over the entire length of the screw-in zone allow.
  • the figures show a screw extractor 1 for unscrewing of screw stumps 10 torn screws.
  • the screw extractor 1 has at its upper end a drive shaft 2, which is used to put on a tap wrench serves. Such screw extractors are always only manually inserted.
  • the drive shaft 2 continues forward into one oblong-cylindrical transition area 3.
  • the transition area 3 no thread is provided.
  • the transition area 3 is straight cylindrical.
  • the entire screw zone 4 runs like a cone the cone angle 6 tapers towards the tip 5.
  • This cone tip is such a screw extractor 1 in the axial Drilled hole 11 of the torn screw stub 10. Since the direction 8 of the winding 7 opposite to Thread direction 9 of the torn screw stub 10 runs, can the broken screw stump 10 screwed out of its threaded hole with some skill become.
  • the notch 12 runs across several turns 7 and points in the direction of rotation of the rotating composite, consisting of Screw extractor 1 and screw stub 10, one in the Axial bore 11 of the screw stump 10 rising crushing flank 14 on.
  • the direction of rotation of the rotating joint 1 + 10 coincides with the screwing-in direction of the screw-in zone 4.
  • the notch 12 has a leading edge 15 with which the notch 12 incorporated into the material of the screw stump 10 and a trailing edge 16, which is in the direction of rotation of the Screw extractor 1 prepared this effect.
  • the rising edge 15 consequently determines the depth 13, with which the notch 12 in the material of the screw extractor is introduced.
  • This insertion depth 13 should practically no deeper than the thread height 17, that is half the difference between the outer diameter 18 of the screw extractor and the basic diameter 19.
  • the screw extractor Since the screw extractor is used correctly while squeezing the edge material of the axial bore 11 worked into the screw stump 10, from the rising flank 15 of a certain screw-in depth, which is referred to here as the squeeze flank, with increasing increasing engagement zone in the wall of the screw stump 11 and pushes the material of the screw stump like this a long time before the screw extractor 1 in the circumferential direction is rigidly connected. This crucial phase the unscrewing process ultimately determines success. As long as the breakaway torque of the screw stump 10 has not yet been exceeded is, the screw extractor 1 must continue in the Material of the screw stump.
  • the figures show exemplary embodiments, where the depth 13 of the notch 12 is no more than that Double the thread height is 17.
  • Figure 2 shows an embodiment, at which is the longitudinal direction of the notch 12 with the axial direction of the screw extractor coincides.
  • FIG 3 shows an exemplary embodiment, in which the notch 12 is practically perpendicular to the Direction of the turns 7 is.
  • the figures show the special case that the Crimp edge 14 offset off-center by a distance (20) is. This means that the rising edge 15 is not on their largest possible lever arm engages the axial bore 11. There is therefore also a certain additional squeezing effect, because the undesirable cutting effect the rising edge 15 is additionally prevented.
  • the off-center offset 20 can also be in the millimeter range lie.
  • Such notches 12 serve the purpose of the invention fully.
  • Crimp edge 15 with a small radius of up to pass about 2 mm into the trailing flank 16.
  • Fig. 3 shows an embodiment, at which the squeeze edge 14 is part of a circular segment Bleed is how easy it is by use a side milling cutter in such screw extractors 1 can be produced.
  • Fig. 2 also shows additional measures for prevention a cutting effect caused by the crushing edge 14 should not be achieved exactly. For this purpose it closes the squeeze flank 14 with the tangent 21 on its peripheral edge an angle 22, which is 90 degrees here.
  • the only decisive factor is the use of the deformation of the Material of the screw stump due to the burr effect the pinch edge 14 causes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Disintegrating Or Milling (AREA)
  • Heterocyclic Compounds That Contain Two Or More Ring Oxygen Atoms (AREA)
  • Materials For Medical Uses (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Rotary Pumps (AREA)
  • Automatic Assembly (AREA)

Claims (6)

  1. Extracteur de vis (1) pour extraire des bouts (10) de vis cassées, lequel extracteur de vis (1) présente une zone filetée (4) qui va en diminuant suivant une forme conique (6) jusqu'à la pointe (5) et qui est pourvue de plusieurs spires (7) très rapprochées et parallèles qui s'étendent en sens inverse par rapport au sens de filetage (9) du bout de vis à extraire (10) et grâce auxquelles l'extracteur de vis (1) pénètre dans un perçage axial (11) réalisé dans le bout de vis (10), jusqu'à former avec ce dernier une liaison tournante (1+10), étant précisé qu'il est prévu dans la zone filetée (4) au moins une entaille qui s'étend transversalement sur plusieurs spires pour augmenter le couple introduit dans le bout de vis (10) et qui présente seulement deux flancs qui sont pratiquement perpendiculaires l'un par rapport à l'autre, l'un étant conçu comme un flanc de butée (15) et l'autre comme un flanc arrière (16),
       caractérisé en ce que le flanc de butée (15) est conçu comme un flanc de pression (14) qui est formé par plusieurs surfaces de coupe très rapprochées présentant les sections transversales triangulaires d'un filetage triangulaire multiple,
       et en ce que l'entaille des spires (7) est excentrée au maximum suivant une distance qui est telle que l'angle (22) entre le flanc de pression (14) et la tangente (21) du bord périphérique de celui-ci soit égal à 90° ± 20°.
  2. Extracteur de vis selon la revendication 1, caractérisé en ce que le flanc de pression (14) se prolonge par le flanc descendant (16) suivant un rayon de moins de 2 mm.
  3. Extracteur de vis selon la revendication 1 ou 2, caractérisé en ce que l'entaille (12) coïncide avec le sens axial de l'extracteur de vis (1).
  4. Extracteur de vis selon la revendication 1 ou 2, caractérisé en ce que le flanc de pression (14) est conçu comme une découpe en forme de segment de cercle.
  5. Extracteur de vis selon l'une des revendications 1 à 4, caractérisé en ce que l'entaille (12) est pratiquement perpendiculaire (6) aux spires.
  6. Extracteur de vis selon l'une des revendications 1 à 5, caractérisé en ce que deux entailles (12) se font face par paires.
EP99104364A 1998-03-05 1999-03-04 Extracteur de goujons Expired - Lifetime EP0940228B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19809252A DE19809252C2 (de) 1998-03-05 1998-03-05 Schraubenausdreher
DE19809252 1998-03-05

Publications (3)

Publication Number Publication Date
EP0940228A2 EP0940228A2 (fr) 1999-09-08
EP0940228A3 EP0940228A3 (fr) 2003-01-15
EP0940228B1 true EP0940228B1 (fr) 2004-02-18

Family

ID=7859696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99104364A Expired - Lifetime EP0940228B1 (fr) 1998-03-05 1999-03-04 Extracteur de goujons

Country Status (3)

Country Link
EP (1) EP0940228B1 (fr)
AT (1) ATE259692T1 (fr)
DE (2) DE19809252C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI746632B (zh) * 2016-09-09 2021-11-21 比利時商赫比工具公司 用於取出車輪用安全螺絲的方法、執行該方法的取出器及工具組以及取出器及工具組的用途

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6761089B2 (en) * 2002-07-01 2004-07-13 Proqual, Llc Tool for removing screws with damaged heads
DE102013101293A1 (de) * 2013-02-08 2014-08-28 Lin Fu-Hua Lösewerkzeug

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1754736A (en) * 1929-12-28 1930-04-15 Greenfield Tap & Die Corp Screw extractor
DE625735C (de) * 1930-12-19 1936-02-14 Greenfield Tap And Die Corp Werkzeug zum Entfernen abgebrochener Schrauben
US1863046A (en) * 1931-07-11 1932-06-14 Cleveland Twist Drill Co Extractor
US2480648A (en) * 1947-11-03 1949-08-30 Delmar C Harer Stud extractor and method of making the same
US3263533A (en) * 1964-08-27 1966-08-02 Textron Ind Inc Screw extractor
DE4334471A1 (de) * 1993-10-10 1995-04-13 Michael Dipl Ing Fuessel Schraubenausdreher

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI746632B (zh) * 2016-09-09 2021-11-21 比利時商赫比工具公司 用於取出車輪用安全螺絲的方法、執行該方法的取出器及工具組以及取出器及工具組的用途

Also Published As

Publication number Publication date
EP0940228A2 (fr) 1999-09-08
ATE259692T1 (de) 2004-03-15
DE19809252C2 (de) 2000-04-06
DE19809252A1 (de) 1999-09-16
DE59908542D1 (de) 2004-03-25
EP0940228A3 (fr) 2003-01-15

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