EP0940228A2 - Schraubenausdreher - Google Patents
Schraubenausdreher Download PDFInfo
- Publication number
- EP0940228A2 EP0940228A2 EP99104364A EP99104364A EP0940228A2 EP 0940228 A2 EP0940228 A2 EP 0940228A2 EP 99104364 A EP99104364 A EP 99104364A EP 99104364 A EP99104364 A EP 99104364A EP 0940228 A2 EP0940228 A2 EP 0940228A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- screw
- flank
- stump
- notch
- extractor
- 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
Links
Images
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.
- 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 depth of imprint.
- 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 circumferential stop leads to a reduced screwing depth of the screw extractor a torsionally rigid connection between screw extractor and Screw stump.
- the squish flanks 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 land 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 areas 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 on 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. There is therefore an at least three-dimensional plastic 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 winding removed from the screw-in zone.
- the recess depth affects the polar section modulus of the remaining cross section practically not or only slightly.
- Chip formation should be avoided in any case 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.
- 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 achieved, so that the screw stump is easy can be turned out of its threaded seat.
- the notch only to lay down to 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 not 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 to the rear or in The screwing direction can be shifted towards the front in the center. This leads to an increased digging effect and also with pinched edges, the effect itself 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 notches 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 runs straight cylindrical.
- the entire screw zone 4 is tapered the cone angle 6 tapers towards the tip 5. With this cone tip such screw extractor 1 in the axial Drilled hole 11 of the torn screw stub 10. Since the direction 8 of the winding 7 is 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 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 not be 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, device 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 long 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.
- Fig. 3 shows an embodiment, at which the squeeze flank 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 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)
Abstract
Description
- Fig.1
- ein erstes Ausführungsbeispiel der Erfindung,
- Fig.2
- die Wirkungsweise der Erfindung bei einem Ausführungsbeispiel gemäß Fig.1,
- Fig.3
- ein weiteres Ausführungsbeispiel der Erfindung,
- Fig.4
- das Ausführungsbeispiel gemäß Fig.3 entlang der Blickrichtung IV.
- 1
- Schraubenausdreher
- 2
- Antriebsschaft
- 3
- länglich zylindrischer Übergangsbereich
- 4
- Einschraubzone
- 5
- Spitze
- 6
- Kegelwinkel
- 7
- Windungen
- 8
- Windungsrichtung
- 9
- Gewinderichtung
- 10
- Schraubenstumpf
- 11
- axiale Bohrung
- 12
- Einkerbung
- 13
- Tiefe der Einkerbung
- 14
- Quetschflanke
- 15
- auflaufende Flanke
- 16
- ablaufende Flanke
- 17
- Gewindehöhe
- 18
- Außendurchmesser
- 19
- Grunddurchmesser
- 20
- außermittiger Versatz
- 21
- Tangente an Umfangskante
- 22
- eingeschlossener Winkel
Claims (6)
- Schraubenausdreher (1) zum Ausdrehen von Schraubenstümpfen (10) abgerissener Schrauben, wobei der Schraubenausdreher (1) eine sich kegelartig (6) zur Spitze (5) verjüngende Einschraubzone (4) mit mehreren zueinander dicht benachbarten und parallel verlaufenden Windungen (7) aufweist, die entgegengesetzt zur Gewinderichtung (9) des herauszudrehenden Schraubenstumpfs (19) verlaufen und mittels welcher sich der Schraubenausdreher (1) soweit in eine axiale Bohrung (11) im Schraubenstumpf (10) einzieht, daß er zusammen mit dem Schraubenstumpf (10) ein Drehverbundstück (1 + 10) bildet, wobei in der Einschraubzone (4) zumindest eine quer über mehrere Windungen verlaufende Einkerbung zur Erhöhung des in den Schraubenstumpf (10) eingeleiteten Drehmoments vorgesehen ist, welche Einkerbung lediglich zwei Flanken aufweist, die zueinander praktisch senkrecht stehen und von denen die eine als auflaufende Flanke (15) und die andere als ablaufende Flanke (16) ausgerichtet ist, dadurch gekennzeichnet, daß1.1 die auflaufende Flanke (15) als Quetschflanke (14) ausgebildet ist, die von einer Vielzahl von zueinander dicht benachbarten Anschnittflächen mit den dreiecksflächigen Querschnitten eines mehrgängigen Spitzgewindes gebildet wird, und daß1.2 die Einkerbung die Windungen (7) um ein höchstens so großes Wegstück außermittig versetzt anschneidet, daß der Winkel (22) zwischen der Quetschflanke (14) und der Tangente (21) an die Umfangskante der Quetschflanke (14) 90 Grad plus/minus 20 Grad beträgt.
- Schraubenausdreher nach Anspruch 1, dadurch gekennzeichnet, daß die Quetschflanke (14) mit einem Radius von weniger als 2mm in die ablaufende Flanke (16) übergeht.
- Schraubenausdreher nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Einkerbung (12) mit der Axialrichtung des Schraubenausdrehers (1) zusammenfällt.
- Schraubenausdreher nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Quetschflanke (14) als kreisabschnittförmiger Anschnitt ausgebildet ist.
- Schraubenausdreher nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Einkerbung (12) praktisch senkrecht zu den Windungen steht (6).
- Schraubenausdreher nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß sich jeweils zwei Einkerbungen (12) paarweise gegenüberliegen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19809252 | 1998-03-05 | ||
DE19809252A DE19809252C2 (de) | 1998-03-05 | 1998-03-05 | Schraubenausdreher |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0940228A2 true EP0940228A2 (de) | 1999-09-08 |
EP0940228A3 EP0940228A3 (de) | 2003-01-15 |
EP0940228B1 EP0940228B1 (de) | 2004-02-18 |
Family
ID=7859696
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99104364A Expired - Lifetime EP0940228B1 (de) | 1998-03-05 | 1999-03-04 | Schraubenausdreher |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0940228B1 (de) |
AT (1) | ATE259692T1 (de) |
DE (2) | DE19809252C2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1534473A1 (de) * | 2002-07-01 | 2005-06-01 | Alden Corporation | WERKZEUG ZUM ENTFERNEN VON SCHRAUBEN MIT BESCHûDIGTEN K PFEN |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013101293A1 (de) * | 2013-02-08 | 2014-08-28 | Lin Fu-Hua | Lösewerkzeug |
EP3292958B1 (de) * | 2016-09-09 | 2019-11-20 | Hubitools S.A. | Ausziehverfahren für eine sicherungsschraube und auszieher zur anwendung des verfahrens |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1754736A (en) * | 1929-12-28 | 1930-04-15 | Greenfield Tap & Die Corp | Screw extractor |
US1863046A (en) * | 1931-07-11 | 1932-06-14 | Cleveland Twist Drill Co | Extractor |
DE625735C (de) * | 1930-12-19 | 1936-02-14 | Greenfield Tap And Die Corp | Werkzeug zum Entfernen abgebrochener Schrauben |
US3263533A (en) * | 1964-08-27 | 1966-08-02 | Textron Ind Inc | Screw extractor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2480648A (en) * | 1947-11-03 | 1949-08-30 | Delmar C Harer | Stud extractor and method of making the same |
DE4334471A1 (de) * | 1993-10-10 | 1995-04-13 | Michael Dipl Ing Fuessel | Schraubenausdreher |
-
1998
- 1998-03-05 DE DE19809252A patent/DE19809252C2/de not_active Expired - Fee Related
-
1999
- 1999-03-04 EP EP99104364A patent/EP0940228B1/de not_active Expired - Lifetime
- 1999-03-04 AT AT99104364T patent/ATE259692T1/de not_active IP Right Cessation
- 1999-03-04 DE DE59908542T patent/DE59908542D1/de not_active Expired - Lifetime
Patent Citations (4)
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 |
US3263533A (en) * | 1964-08-27 | 1966-08-02 | Textron Ind Inc | Screw extractor |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1534473A1 (de) * | 2002-07-01 | 2005-06-01 | Alden Corporation | WERKZEUG ZUM ENTFERNEN VON SCHRAUBEN MIT BESCHûDIGTEN K PFEN |
EP1534473A4 (de) * | 2002-07-01 | 2007-04-18 | Alden Corp | WERKZEUG ZUM ENTFERNEN VON SCHRAUBEN MIT BESCHûDIGTEN K PFEN |
Also Published As
Publication number | Publication date |
---|---|
DE19809252A1 (de) | 1999-09-16 |
DE19809252C2 (de) | 2000-04-06 |
EP0940228B1 (de) | 2004-02-18 |
ATE259692T1 (de) | 2004-03-15 |
EP0940228A3 (de) | 2003-01-15 |
DE59908542D1 (de) | 2004-03-25 |
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