EP0336136A1 - Embout de tournevis - Google Patents

Embout de tournevis Download PDF

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Publication number
EP0336136A1
EP0336136A1 EP89104230A EP89104230A EP0336136A1 EP 0336136 A1 EP0336136 A1 EP 0336136A1 EP 89104230 A EP89104230 A EP 89104230A EP 89104230 A EP89104230 A EP 89104230A EP 0336136 A1 EP0336136 A1 EP 0336136A1
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.)
Granted
Application number
EP89104230A
Other languages
German (de)
English (en)
Other versions
EP0336136B1 (fr
EP0336136B2 (fr
Inventor
Karl Lieser
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.)
Wera Werk Hermann Werner GmbH and Co KG
Original Assignee
Wera Werk Hermann Werner 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6349389&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0336136(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Wera Werk Hermann Werner GmbH and Co KG filed Critical Wera Werk Hermann Werner GmbH and Co KG
Priority to AT89104230T priority Critical patent/ATE75982T1/de
Publication of EP0336136A1 publication Critical patent/EP0336136A1/fr
Publication of EP0336136B1 publication Critical patent/EP0336136B1/fr
Application granted granted Critical
Publication of EP0336136B2 publication Critical patent/EP0336136B2/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
    • 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.
  • the 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 disposable 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.
  • the intermediate section between the drive end section and the output end section allows an elastic twisting lung / torsion.
  • the intermediate section is an elastically flexible element with a corresponding resilience after the load peak has been overcome. It can withstand larger 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 (in the case of normal steel as a 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 of varying 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 externally identical screwdriver bits with different intermediate sections, with regard to its torsional resistance moment.
  • the intermediate section is preferably a round section stepped in relation to the polygonal section. Require screwdriver bits for the transmission of low torques 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 in the same circumferential distribution arranged driving ribs 8 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 connects the aforementioned screwdriver tip section 9 and the drive end region 11 to one another.
  • 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.
  • This protruding apex 8 ' also bring freedom of adjustment with respect to the intermediate section diameter with the same insertion connection conditions for the screw.
  • the force-transmitting depth of penetration into the screw generally only extends to a maximum of about half of the 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 thereby pulls the screwdriver insert 1 into the machine chuck 13 until the brush surface 17 lies against the bottom of the machine chuck 13.
  • 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 way 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 output end section 9 thus 17 mm, the one up to the level of the normal screw-in depth approx. 14 mm.
  • the diameter of the central section is approximately 4 mm.
  • the ratio of diameter to length, which is jointly responsible for the torsional stiffness of the intermediate section 10, which is made of appropriate (common tool steel) material, is accordingly 0.3.
  • This ratio creates a torsional property which brings considerable improvements for the power transmission from a machine screwdriver to a screw in that load peaks are cushioned.
  • the achievement of the torque leading to plastic deformation or the breaking torque of such screwdriver bits is preceded by a considerable elastic torsion, which turns out to be
  • the restoring torque has a flattening effect 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. In known applications, 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 prevents deformation of the screw engagement surfaces of the ribs 8.
  • 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 included 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 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)
EP89104230A 1988-03-10 1989-03-09 Embout de tournevis Expired - Lifetime EP0336136B2 (fr)

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 true EP0336136A1 (fr) 1989-10-11
EP0336136B1 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 (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995020470A1 (fr) * 1994-01-26 1995-08-03 Vermont American Corporation Lame pour un tournevis a moteur
US5704261A (en) * 1992-12-22 1998-01-06 Wera Werk Hermann Werner Gmbh & Co. Torque-transmitting tool
WO2012049078A1 (fr) 2010-10-15 2012-04-19 Wera - Werk Hermann Werner Gmbh & Co. Kg Dispositif de transmission de couple de rotation à utiliser avec une clé à chocs
US8955418B2 (en) 2013-03-08 2015-02-17 Black & Decker Inc. Threaded fastener driving tool

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5535867A (en) * 1993-11-01 1996-07-16 Coccaro; Albert V. Torque regulating coupling
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
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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501386A (en) * 1947-11-13 1950-03-21 Gibbs George Gordon Portable power transmitting unit and changeable toolholder
US2619860A (en) * 1946-08-14 1952-12-02 Jr Ralph E Gray Flexible tool with predetermined overload yielding means
FR1496505A (fr) * 1966-02-17 1967-09-29 Bauer & Schaurte Procédé et dispositif pour serrer des vis ou analogues
DE1603937A1 (de) * 1965-03-22 1971-02-18 Rockwell Mfg Co Mit Druckmittel betaetigtes Werkzeug
DE2231949A1 (de) * 1971-07-26 1973-02-08 Xerox Corp Drehmomentwerkzeug
FR2254403A1 (en) * 1973-12-14 1975-07-11 Irvator Ab Torque limiting socket spanner - has shaft yielding torsionally at the desired torque
EP0221279A2 (fr) * 1985-10-31 1987-05-13 Wera-Werk Hermann Werner GmbH & Co. Pièce d'insertion pour tournevis

Patent Citations (7)

* Cited by examiner, † Cited by third party
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
DE1603937A1 (de) * 1965-03-22 1971-02-18 Rockwell Mfg Co Mit Druckmittel betaetigtes Werkzeug
FR1496505A (fr) * 1966-02-17 1967-09-29 Bauer & Schaurte Procédé et dispositif pour serrer des vis ou analogues
DE2231949A1 (de) * 1971-07-26 1973-02-08 Xerox Corp Drehmomentwerkzeug
FR2254403A1 (en) * 1973-12-14 1975-07-11 Irvator Ab Torque limiting socket spanner - has shaft yielding torsionally at the desired torque
EP0221279A2 (fr) * 1985-10-31 1987-05-13 Wera-Werk Hermann Werner GmbH & Co. Pièce d'insertion pour tournevis

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5704261A (en) * 1992-12-22 1998-01-06 Wera Werk Hermann Werner Gmbh & Co. Torque-transmitting tool
WO1995020470A1 (fr) * 1994-01-26 1995-08-03 Vermont American Corporation Lame pour un tournevis a moteur
AU686597B2 (en) * 1994-01-26 1998-02-12 Vermont American Corporation Insert bit for use with a powered screwdriver
US5868047A (en) * 1994-01-26 1999-02-09 Vermont American Corporation Insert bit for use with a powered screwdriver
WO2012049078A1 (fr) 2010-10-15 2012-04-19 Wera - Werk Hermann Werner Gmbh & Co. Kg Dispositif de transmission de couple de rotation à utiliser avec une clé à chocs
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

Also Published As

Publication number Publication date
EP0336136B1 (fr) 1992-05-13
ES2032619T5 (es) 1998-07-01
ES2032619T3 (es) 1993-02-16
EP0336136B2 (fr) 1998-03-11
ATE75982T1 (de) 1992-05-15
DE58901364D1 (de) 1992-06-17
JPH02503405A (ja) 1990-10-18
WO1989008536A1 (fr) 1989-09-21

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