EP0336136B2 - Schraubendrehereinsatz - Google Patents
Schraubendrehereinsatz Download PDFInfo
- Publication number
- EP0336136B2 EP0336136B2 EP89104230A EP89104230A EP0336136B2 EP 0336136 B2 EP0336136 B2 EP 0336136B2 EP 89104230 A EP89104230 A EP 89104230A EP 89104230 A EP89104230 A EP 89104230A EP 0336136 B2 EP0336136 B2 EP 0336136B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- intermediate section
- length
- screwdriver
- screwdriver bit
- 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
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
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
-
- 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
- B25B15/00—Screwdrivers
-
- 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
- B25B15/00—Screwdrivers
- B25B15/001—Screwdrivers characterised by material or shape of the tool bit
-
- 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
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
Definitions
- the invention relates to a screwdriver bit according to the preamble of claim 1 (see 2.B EP-A-0221279)
- a twistable zone serves as a predetermined breaking point.
- the intermediate section breaks when a target torque is reached.
- the object of the invention is based on the object of a generic screwdriver insert to design in a technically simple manner so that acting on the screwdriver bit Torque peaks do not cause deformation of the screwdriver tip section that Lifespan increased and working with machine screwdrivers is considerably easier.
- a generic screwdriver insert is of increased height Use value specified. If higher torque peaks are effective on the screwdriver insert, for example caused by abruptly occurring drive force peaks or by different Condition of the material receiving the screw, the intermediate section between Drive end section and output end section an elastic twist / torsion.
- the intermediate section provides an elastic flexible element with corresponding resilience after overcoming the peak load. It endures larger Moments, even with repeated loads. He absorbs deformation work and partially stores it in the form of potential energy and releases it when it is relieved back again.
- the intermediate section acts as a damper, so that torque peaks are not directly proportional to Screwdriver tip section take effect. This does in a particularly long service life of the screwdriver insert and the screw noticeable.
- the intermediate section twists.
- the screwdriver tip can be the intermediate section in its length and its cross-section are designed so that any energy peaks are always absorbed under load will.
- the ratio at normal steel as material for DIN-standardized use
- the ratio corresponds in particular the length of the intermediate section about 3 times hers Diameter.
- a further possibility to solve the task according to the invention is one Provide axial cavity in the intermediate section by the Polygonal section runs out. The axial cavity can be changed / adjusted of the torsional resistance moment of the intermediate section can be chosen differently in diameter and also of different lengths.
- the intermediate section is preferably one opposite the polygonal section stepped circular section. Screwdriver bits to transmit low torques a correspondingly smaller intermediate section.
- the number 1 denotes a screwdriver bit in DIN standard (size 2). With this one Phillips screw 2 illustrated in Fig. 1 are rotated. The latter consists of one a thread 3 having screw shaft 4 and a countersunk head 5, which contains the cross recess 6.
- the screwdriver tip 7 is designed in accordance with the cross recess 6 and the associated DIN standard. This has four driving ribs 8 arranged in the same circumferential distribution and thus forms the output end region 9 (screwdriver tip section). This is followed by a circular cross section Intermediate section 10, which the aforementioned screwdriver tip section 9 and the drive end portion 11 connects with each other.
- the force-transmitting depth of penetration into the screw is generally sufficient only about a maximum of half of section Ab and is in any case DIN-standardized for the test torques.
- At the conical step 12 from the circular cross section of the intermediate section 10 to the polygonal section 11 rests on the elastic ring 16, arranged in an inner groove 15 of the machine chuck 13, and pulls thereby inserting the screwdriver 1 into the machine chuck 13 until the thread surface 17 at the bottom of the Machine feed 13 is present.
- This bracket can have considerable tolerances because of the pulling moment compensate for what in turn the production of insert 1 overall by way of (never so absolutely accurate cold deformation to be carried out.
- the total length of the screwdriver bit 1 shown is 25 in accordance with the DIN standard mm.
- the one minus the polygonal section is about 17 mm.
- the intermediate section 10 (including the Section S) and output end section thus take up approximately 70% of the total length of the insert 1.
- the length Zone S is approximately half the length of the section Ab and approximately just the length of the in Screw submersible output end section; the remaining length of the intermediate section 10 from the roots 8 '' up to level 16 a little more than twice the length of this output end section Ab or somewhat more than four times the length of zone S.
- the length of the intermediate section 10 plus zone S is therefore approx. 11 mm, the one plus the output end section 9, ie 17 mm, the one up to the level of the normal screw insertion depth approx.
- the screwdriver bit 1 is attached in such a way that his screwdriver tip 7 positively engages in the Phillips 6 of the Phillips screw.
- this leads to a resistance that remains in the elastic range Torsion of the intermediate section 10, primarily on its area T. Its torsional modulus is also less than the section modulus Screwdriver tip section 9. Large energy spikes are accordingly eliminated so that the screwdriver tip 7 Protected against excessive loads remains associated with an increased service life.
- the second embodiment of the screwdriver bit 18 illustrated in FIG. 3 largely corresponds the design described above.
- the same components are therefore provided with the same reference numbers.
- an axial cavity 19 now extends from the polygonal section 11 which extends over the intermediate section 10 and ends before the tip section 9 or the zone S.
- a change or adaptation option for the torsional modulus is obtained of the intermediate section 10, so that torsion of the same may occur even at very low loads.
- a variation can be obtained in such an embodiment in that the diameter is different large axial cavities can be selected.
- the torsional modulus of the intermediate section can be determined by its shape and cross-sectional size 6 determine. It is therefore an optimal adaptation to a wide variety of circumstances possible.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Dowels (AREA)
Description
Claims (7)
- Schraubendrehereinsatz mit endständigem Antriebsbereich zum Einstecken in ein Maschinenfutter, einem Zwischenabschnitt und einem Antriebsbereich mit einer Schraubendreherspitze (7), die für den Eingriff in Kreuzschlitzschrauben in gleicher Umfangsverteilung angeordnete Mitnahmerippen (8) aufweist, deren Scheitel (8') radial über den Querschnitt des Zwischenabschnitts (10) überstehen, dadurch gekennzeichnet, daß der Zwischenabschnitt eine tordierbare Zone aufweist, daß das Verhältnis von Durchmesser zu Länge des gleichbleibenden Querschnitts besitzenden Zwischenabschnitts (10) kleiner als 0,5 und größer als 0,2 ist und der Quotient aus Verdreh-Fließgrenze und Torsionsmodul der tordierbaren Zone T derart ist, daß bis zum Erreichen des zur plastischen Verformung/Bruch führenden Drehmomentes der aus der elastischen Rückstellkraft des Zwischenabschnitts (10) resultierende Rückdrehwinkel bei 3,5 bis 8 Grad liegt, ausgenommen solche Schraubendrehereinsätze, bei welchen das Verhältnis von Durchmesser zu Länge des Zwischenabschnitts kleiner/gleich 0,253 ist, und ausgenommen solche, bei welchen der Rückdrehwinkel kleiner als 4,1 Grad ist.
- Schraubendrehereinsatz nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis von Durchmesser zu Länge des ca. 14 mm langen Zwischenabschnitts kleiner als 0,5 ist.
- Schraubendrehereinsatz nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Verhältnis Durchmesser zu Länge des bis zu den Scheiteln (8') der Rippen (8) reichenden Zwischenabschnitts (10) 1:3 beträgt und bis zur Schraubendrehereinsatz-Spitze (9') ca. 1:4.
- Schraubendrehereinsatz nach einem oder mehreren der vorhergehenden Ansprüche, gekennzeichnet durch eine Axialhöhlung (19) im Zwischenabschnitt (10).
- Schraubendrehereinsatz nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Scheitel (8') der Mitnahme-Rippen (8) bis zu ihrer Wurzel eine Zone S bilden, deren dynamische Torsionfestigkeit kleiner ist als diejenige des restlichen Zwischenabschnitts (10).
- Schraubendrehereinsatz nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Zwischenabschnitt (10) in gleichbleibendem kreisrunden Querschnitt bis zu einer kegelstumpfförmigen Übergangsstufe (16) zum Mehrkantabschnitt (11) reicht, welche Übergangsstufe nur ca. 1/7 der Länge des Zwischenabschnitts (10) einnimmt, und auf dieser Länge den Übergang auf den etwa doppelt so großen Querschnitt des Mehrkantabschnitts (11) bringt mit einem Kegelwinkel von etwa 50°.
- Schraubendrehereinsatz nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Durchmesser des Zwischenabschnitts (10) größer ist als die Länge der Zone S und etwas kleiner als die Länge (Ab) des Abtriebsendabschnitts (9) ist.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89104230T ATE75982T1 (de) | 1988-03-10 | 1989-03-09 | Schraubendrehereinsatz. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3807972 | 1988-03-10 | ||
DE3807972 | 1988-03-10 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0336136A1 EP0336136A1 (de) | 1989-10-11 |
EP0336136B1 EP0336136B1 (de) | 1992-05-13 |
EP0336136B2 true EP0336136B2 (de) | 1998-03-11 |
Family
ID=6349389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89104230A Expired - Lifetime EP0336136B2 (de) | 1988-03-10 | 1989-03-09 | Schraubendrehereinsatz |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0336136B2 (de) |
JP (1) | JPH02503405A (de) |
AT (1) | ATE75982T1 (de) |
DE (1) | DE58901364D1 (de) |
ES (1) | ES2032619T5 (de) |
WO (1) | WO1989008536A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4243608C2 (de) * | 1992-12-22 | 2000-10-19 | Werner Hermann Wera Werke | Werkzeug |
US5535867A (en) * | 1993-11-01 | 1996-07-16 | Coccaro; Albert V. | Torque regulating coupling |
DE69415348T2 (de) * | 1994-01-26 | 1999-04-29 | Vermont American Corp | Schraubendreheinsatz für den gebrauch mit einem elektrischen schraubenzieher |
CN102271870A (zh) | 2008-11-07 | 2011-12-07 | 米沃奇电动工具公司 | 刀头 |
USD711719S1 (en) | 2009-11-06 | 2014-08-26 | Milwaukee Electric Tool Corporation | Tool bit |
DE102010038210A1 (de) | 2010-10-15 | 2012-04-19 | Wera-Werk Hermann Werner Gmbh & Co. Kg | Drehmomentübertragungsvorrichtung zur Verwendung mit einem Drehschlagschrauber |
US8955418B2 (en) | 2013-03-08 | 2015-02-17 | Black & Decker Inc. | Threaded fastener driving tool |
US10022845B2 (en) | 2014-01-16 | 2018-07-17 | Milwaukee Electric Tool Corporation | Tool bit |
WO2019109098A1 (en) | 2017-12-01 | 2019-06-06 | Milwaukee Electric Tool Corporation | Wear resistant tool bit |
USD921468S1 (en) | 2018-08-10 | 2021-06-08 | Milwaukee Electric Tool Corporation | Driver bit |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2619860A (en) * | 1946-08-14 | 1952-12-02 | Jr Ralph E Gray | Flexible tool with predetermined overload yielding means |
US2501386A (en) * | 1947-11-13 | 1950-03-21 | Gibbs George Gordon | Portable power transmitting unit and changeable toolholder |
DE1603708A1 (de) * | 1966-02-17 | 1970-09-17 | Bauer & Schaurte Schrauben U M | Verfahren zum Anziehen von Schrauben |
DE2231949A1 (de) * | 1971-07-26 | 1973-02-08 | Xerox Corp | Drehmomentwerkzeug |
SE7316910L (sv) * | 1973-12-14 | 1975-06-16 | Irvator Ab | Momentverktyg, serskilt momenthylsnyckel. |
DE3538675A1 (de) * | 1985-10-31 | 1987-05-07 | Werner Hermann Wera Werke | Schraubendrehereinsatz |
-
1989
- 1989-03-09 JP JP1504883A patent/JPH02503405A/ja active Pending
- 1989-03-09 ES ES89104230T patent/ES2032619T5/es not_active Expired - Lifetime
- 1989-03-09 EP EP89104230A patent/EP0336136B2/de not_active Expired - Lifetime
- 1989-03-09 WO PCT/EP1989/000247 patent/WO1989008536A1/de unknown
- 1989-03-09 DE DE8989104230T patent/DE58901364D1/de not_active Expired - Lifetime
- 1989-03-09 AT AT89104230T patent/ATE75982T1/de active
Also Published As
Publication number | Publication date |
---|---|
EP0336136A1 (de) | 1989-10-11 |
DE58901364D1 (de) | 1992-06-17 |
WO1989008536A1 (en) | 1989-09-21 |
ES2032619T5 (es) | 1998-07-01 |
EP0336136B1 (de) | 1992-05-13 |
ES2032619T3 (es) | 1993-02-16 |
ATE75982T1 (de) | 1992-05-15 |
JPH02503405A (ja) | 1990-10-18 |
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