EP0336136B1 - Embout de tournevis - Google Patents
Embout de tournevis Download PDFInfo
- Publication number
- EP0336136B1 EP0336136B1 EP89104230A EP89104230A EP0336136B1 EP 0336136 B1 EP0336136 B1 EP 0336136B1 EP 89104230 A EP89104230 A EP 89104230A EP 89104230 A EP89104230 A EP 89104230A EP 0336136 B1 EP0336136 B1 EP 0336136B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- intermediate section
- length
- screwdriver bit
- screwdriver
- 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
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims 3
- 238000011084 recovery Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
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 insert 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.
- These screwdriver bits should not be able to transmit excessive torque peaks when used in machine screw chucks.
- the insert is a single-use item for tightening screws. It can only be used to a limited extent.
- the object of the invention is based on the object of designing a generic screwdriver insert in a technically simple manner so that torque peaks acting on the screwdriver insert do not lead to any deformation of the screwdriver tip section, the service life is increased and working with machine screwdrivers is considerably facilitated.
- a generic screwdriver insert of increased utility value is specified. If higher torque peaks become effective on the screwdriver insert, for example caused by abruptly occurring drive force peaks or by different properties of the material receiving the screw, the intermediate section between the drive end section and the output end section allows an elastic twist / torsion.
- the intermediate section is an elastically flexible element with a corresponding resilience after the load peak has been overcome. It can withstand greater moments, even with repeated loading. It takes up deformation work and partially stores it in the form of potential energy and returns it when the load is released.
- the intermediate section acts as a damper so that torque peaks are not directly proportional to the screwdriver tip section. This is reflected in the particularly long service life of the screwdriver insert and the screw.
- the intermediate section twists.
- the length and cross section of the intermediate section can be designed in such a way that any energy peaks are always absorbed under load. It is advantageous if the ratio (with normal steel as material for DIN-standardized use) of diameter to length of the intermediate section is in the range between 0.5 and 0.2 or the length of intermediate section 10 corresponds approximately to 3 times the diameter.
- a further possibility to vary the torsional moment of resistance of the intermediate section is to provide an axial cavity in the intermediate section, which starts from the polygonal section.
- the axial cavity can be selected to have a different size and a different length to change / adapt the torsional resistance moment of the intermediate section. This makes it possible, for example, to produce screwdriver bits of identical design with different intermediate sections, with regard to its torsional resistance.
- the intermediate section is preferably a round section stepped in relation to the polygonal section. Screwdriver bits for the transmission of low torques require a correspondingly smaller intermediate section.
- the number 1 denotes a screwdriver bit in DIN standard (size 2).
- a Phillips screw 2 illustrated in FIG. 1 can be rotated with this.
- the latter is composed of a screw shaft 4 having a thread 3 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 an intermediate section 10 which is circular in cross section and which has the aforementioned screwdriver tip section 9 and the drive send range 11 connects to each other.
- the length of the polygonal section 11 corresponds approximately to that of the intermediate section 10.
- Steel with resilient properties for example chromium-nickel steel, is used to produce the screwdriver insert. It is made by cold forming.
- the force-transmitting depth of penetration into the screw is generally only about a maximum of half of the section ts From and is also DIN-standardized for the test torques.
- the elastic ring 16, arranged in an inner groove 15 of the machine chuck 13 bears and thereby pulls the screwdriver bit 1 into the machine chuck 13 until the striking surface 17 at the bottom of the machine chuck 13 is present.
- This holder can compensate for considerable tolerances due to the pulling-in torque, which in turn accommodates the production of the insert 1 as a whole by means of the cold deformation (which is never so absolutely precise).
- the total length of the screwdriver bit 1 shown is 25 mm in accordance with the DIN standard.
- the one minus the polygonal section is about 17 mm.
- the intermediate section 10 (including section S) and output end section thus take up approximately 70% of the total length of the insert 1.
- the length of the zone S is approximately half the length of the section Ab and approximately just the length of the output end section which can be immersed in the screw; the remaining length of the intermediate section 10 from the roots 8 "to the step 16 is slightly more than twice the length of this output end section Ab or slightly more than four times the length of the zone S.
- the length of the intermediate section 10 plus zone S is therefore approximately 11 mm, the one plus the output end section 9 is 17 mm, the one up to the level of the normal screw insertion depth is about 14 mm.
- the diameter of the middle section is about 4 mm.
- the intermediate section 10 which is responsible for the torsional rigidity of the corresponding (common tool steel) material
- the ratio of diameter to length is accordingly 0.3
- This ratio creates a torsional property which, for the transmission of power from a machine screwdriver to a screw, brings about considerable improvements in that load peaks are cushioned, reaching the torque which leads to plastic deformation or the breaking torque of such screwdrivers
- This is preceded by a considerable elastic torsion, which has a flattening effect as a restoring torque via considerable rotation angle energy peaks and can be demonstrated by the size of the return rotation angle when the deformation torque or the breaking torque is reached.
- this reverse rotation angle is 2 degrees; in the solutions designed according to the invention, however, at 3.5-8 degrees.
- the torsion in use also has the effect that deformation of the screw engagement surfaces of the ribs 8 is prevented.
- the screwdriver bit 1 is set in such a way that its screwdriver tip 7 positively engages in the Phillips screw 6 of the Phillips screw. If larger energy peaks occur during the screwing in of the Phillips screw, caused e.g. due to a rapid increase in counterforce on the screw, this leads to a torsion of the intermediate section 10 that remains in the elastic range, primarily on its range T. Its torsional section modulus is also smaller than the section modulus against deformation in the screwdriver tip section 9 Energy peaks are accordingly eliminated, so that the screwdriver tip 7 is protected from excessive stress combined with an increased service life.
- the second embodiment of the screwdriver insert 18 illustrated in FIG. 3 largely corresponds to the configuration described above.
- the same components are therefore provided with the same reference numbers.
- an axial cavity 19 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 possibility for the torsional modulus of the intermediate section 10 is obtained, so that torsion of the same may occur even at a very low load.
- a variation in such an embodiment can be obtained by choosing axial cavities of different sizes in diameter.
- the torsional section modulus of the intermediate section can be determined by its shape and cross-sectional size 6. It is therefore possible to optimally adapt to the most varied of conditions.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Dowels (AREA)
Claims (7)
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 (fr) | 1989-10-11 |
EP0336136B1 true EP0336136B1 (fr) | 1992-05-13 |
EP0336136B2 EP0336136B2 (fr) | 1998-03-11 |
Family
ID=6349389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89104230A Expired - Lifetime EP0336136B2 (fr) | 1988-03-10 | 1989-03-09 | Embout de tournevis |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0336136B2 (fr) |
JP (1) | JPH02503405A (fr) |
AT (1) | ATE75982T1 (fr) |
DE (1) | DE58901364D1 (fr) |
ES (1) | ES2032619T5 (fr) |
WO (1) | WO1989008536A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8418587B2 (en) | 2008-11-07 | 2013-04-16 | Milwaukee Electric Tool Corporation | Tool bit |
USD711719S1 (en) | 2009-11-06 | 2014-08-26 | Milwaukee Electric Tool Corporation | Tool bit |
US10022845B2 (en) | 2014-01-16 | 2018-07-17 | Milwaukee Electric Tool Corporation | Tool bit |
Families Citing this family (7)
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 |
EP0741633B1 (fr) * | 1994-01-26 | 1998-12-16 | Vermont American Corporation | Lame pour un tournevis a moteur |
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 |
US11638987B2 (en) | 2017-12-01 | 2023-05-02 | 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 EP EP89104230A patent/EP0336136B2/fr not_active Expired - Lifetime
- 1989-03-09 WO PCT/EP1989/000247 patent/WO1989008536A1/fr unknown
- 1989-03-09 AT AT89104230T patent/ATE75982T1/de active
- 1989-03-09 ES ES89104230T patent/ES2032619T5/es not_active Expired - Lifetime
- 1989-03-09 DE DE8989104230T patent/DE58901364D1/de not_active Expired - Lifetime
- 1989-03-09 JP JP1504883A patent/JPH02503405A/ja active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8418587B2 (en) | 2008-11-07 | 2013-04-16 | Milwaukee Electric Tool Corporation | Tool bit |
US8800407B2 (en) | 2008-11-07 | 2014-08-12 | Milwaukee Electric Tool Corporation | Method of manufacturing a tool bit |
US9849570B2 (en) | 2008-11-07 | 2017-12-26 | Milwaukee Electric Tool Corporation | Tool bit |
US10065294B2 (en) | 2008-11-07 | 2018-09-04 | Milwaukee Electric Tool Corporation | Tool bit |
US11407090B2 (en) | 2008-11-07 | 2022-08-09 | Milwaukee Electric Tool Corporation | Tool bit |
USD711719S1 (en) | 2009-11-06 | 2014-08-26 | Milwaukee Electric Tool Corporation | Tool bit |
US10022845B2 (en) | 2014-01-16 | 2018-07-17 | Milwaukee Electric Tool Corporation | Tool bit |
Also Published As
Publication number | Publication date |
---|---|
EP0336136A1 (fr) | 1989-10-11 |
ES2032619T3 (es) | 1993-02-16 |
EP0336136B2 (fr) | 1998-03-11 |
JPH02503405A (ja) | 1990-10-18 |
ES2032619T5 (es) | 1998-07-01 |
WO1989008536A1 (fr) | 1989-09-21 |
DE58901364D1 (de) | 1992-06-17 |
ATE75982T1 (de) | 1992-05-15 |
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