EP0026738A1 - Tournevis - Google Patents

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Publication number
EP0026738A1
EP0026738A1 EP80810278A EP80810278A EP0026738A1 EP 0026738 A1 EP0026738 A1 EP 0026738A1 EP 80810278 A EP80810278 A EP 80810278A EP 80810278 A EP80810278 A EP 80810278A EP 0026738 A1 EP0026738 A1 EP 0026738A1
Authority
EP
European Patent Office
Prior art keywords
housing
screwdriver
spindle
screw
motor
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.)
Withdrawn
Application number
EP80810278A
Other languages
German (de)
English (en)
Inventor
Bernard Lecureux
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0026738A1 publication Critical patent/EP0026738A1/fr
Withdrawn legal-status Critical Current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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type

Definitions

  • the present invention relates to a screwdriver with a drive motor for the work spindle.
  • screwdrivers are known, the drive motor being used exclusively to drive the spindle. If the screwdrivers are designed as handy hand tools in this case, the torque that can be generated is not sufficient for larger screws, so that such screwdrivers are mainly used for precision mechanical work. If you wanted to provide a gear unit with such a reduction, that sufficient torques for tightening even larger screws can be reached, the work spindle would turn so slowly that screwing in the screw would be practically impossible within a useful period of time.
  • very heavy motor-driven screwdrivers are known, which are usually driven pneumatically.
  • the spindle can be coupled to the housing in order to turn the screw either by means of the motor or by turning the housing.
  • the process of screwing in the screw which usually requires the greatest amount of time, can now be carried out quickly with low motor power, whereupon the screw can be tightened by hand via the housing coupled to the spindle.
  • a tightened screw can first be loosened by hand via the housing and the spindle coupled to it, whereupon the screw can be quickly unscrewed by means of the drive motor.
  • the housing is therefore preferably a handle, e.g. pistol-shaped in the usual way for hand tools and it is therefore possible to exert considerable torque without great effort and fatigue via this housing.
  • a freewheel gear is preferably arranged between the spindle and the housing, which allows the spindle to rotate in the desired direction of rotation in the housing and via which the housing can drive the stationary spindle in the same direction of rotation.
  • the freewheel gear mechanism can preferably be convertible in order to lock in one direction or the other as desired and in this way to use the screwdriver optionally for tightening or loosening screws.
  • the screwdriver has a pistol-shaped housing, in the furthest rear part 1 of which a drive motor with an attached reduction gear, for example planetary gear, is accommodated.
  • the housing has a pistol grip 2, of the type customary for electrical hand tools, to which the actuation button 3 for switching the drive motor on and off is also attached in the usual manner.
  • the supply takes place with a suitable low voltage via a cable 4, in which a control line can also be located.
  • tapered part 5 of the housing there is a freewheel gear which can be changed over by means of a slide 6 and which acts between the housing and the spindle 7 mounted therein.
  • Any tool that is to say any screwdriver of any shape, can be interchangeably inserted into the spindle 7.
  • Fig. 2 shows in section part 5 of the housing with the freewheel gear.
  • a ratchet wheel 8 with external teeth, in which either a pawl 9a or a pawl 9b can engage.
  • the left end of the leaf spring 11 presses onto the pawl 9a and holds it in an internal engagement position.
  • the pawl 9a blocks the rotation of the ratchet wheel in one direction, while permitting the rotation in the other direction. If the slide 6 is shifted to the left, the pawl 9b engages while the pawl 9a is disengaged and the ratchet wheel and the spindle 7 are now locked in the opposite direction.
  • Such freewheel gearboxes are known and therefore do not require any further illustration and explanation.
  • An inner part of the slide 6 is designed as a contact 12, which cooperates with a resilient contact 13.
  • the contacts 12 and 13 are in an electrically conductive connection and thus close a control circuit which preselects a specific direction of rotation of the drive motor via the cable 4.
  • the slide 6 is located in the left end position, the switch with the contacts 12 and 13 is open and the other direction of rotation of the drive motor is preselected.
  • the respective direction of rotation of the spindle coincides with the freewheeling direction of rotation, i.e. whenever the motor is switched on, the spindle 7 can rotate freely in the drive direction in the housing.
  • the screwdriver is attached to the screw head after the desired direction of rotation has been preselected with the slider 6, i.e. normally clockwise rotation for right-handed screws, after which the motor is switched on by pressing the button 3.
  • the spindle now rotates relatively quickly, with which the screw is screwed into the thread. If the screw is screwed in completely, the resistance increases and the motor stops.
  • the operator who monitors this process now continues to turn the housing in the previous direction of rotation to the screw end valid to tighten. This rotation of the housing is now rigidly transmitted to the spindle via the freewheel gear.
  • the housing can simply be turned back and rotated again in the desired direction to further tighten the screw, the freewheel gear preventing the screw from turning back when the housing is turned back .
  • the freewheel gear or ratchet gear is first brought into the correct position. Then the screwdriver is attached and the screw is loosened by turning the housing. When the torque has decreased sufficiently, the operator presses the button 3, whereupon the motor quickly unscrews the screw from the thread.
  • a simple, not convertible ratchet gear can suffice if the screwdriver is only ever used to mount devices.
  • An electric motor is usually provided as the drive motor, but any other suitable drive motor, for example a pneumatic motor, could be used. It is essential in both cases that a relatively low drive power is required and the screwdriver can therefore have small, handy dimensions.
  • a ratchet gear or freewheel gear also enables particularly simple handling, another clutch can also be provided, which, for example, must be manually engaged or disengaged.
  • the underlying principle need not be limited to relatively small hand tools. It would also be advantageous for larger versions to quickly screw in or unscrew the screws with a relatively low power and low torque and tighten or Solve using other mechanical means. For example, a hexagon for attaching a key or a hole for inserting a mandrel could be provided on the housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP80810278A 1979-09-17 1980-09-08 Tournevis Withdrawn EP0026738A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH836679A CH640452A5 (de) 1979-09-17 1979-09-17 Schraubenzieher.
CH8366/79 1979-09-17

Publications (1)

Publication Number Publication Date
EP0026738A1 true EP0026738A1 (fr) 1981-04-08

Family

ID=4339211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80810278A Withdrawn EP0026738A1 (fr) 1979-09-17 1980-09-08 Tournevis

Country Status (3)

Country Link
EP (1) EP0026738A1 (fr)
JP (1) JPS56102483A (fr)
CH (1) CH640452A5 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088836A1 (fr) * 1982-03-11 1983-09-21 Katsuyuki Totsu Tournevis électrique
FR2581913A1 (fr) * 1985-02-27 1986-11-21 Black & Decker Inc Systeme a cliquet selectivement verrouillable pour outils portatifs, en particulier outils electriques alimentes par batterie
GB2445826B (en) * 2006-11-16 2010-06-09 Bosch Gmbh Robert Toolroom ratchet
US7836797B2 (en) 2006-11-16 2010-11-23 Robert Bosch Gmbh Tool ratchet
KR101278005B1 (ko) * 2005-03-19 2013-06-27 다이스타 컬러스 디스트리뷰션 게엠베하 금속 착물 염료 혼합물
WO2023012119A1 (fr) * 2021-08-02 2023-02-09 Adolf Würth GmbH & Co. KG Clé à chocs ou à impulsions et procédé de vissage de vis

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1947102A1 (de) * 1969-09-17 1971-04-08 Albert Jean Paul Elektrisch angetriebener Ratschen-Schraubschluessel
DE2513648A1 (de) * 1975-03-27 1976-09-02 Holland Letz Felo Werkzeug Ratschen-schraubendreher
US4078589A (en) * 1976-05-10 1978-03-14 Miller Walter L Battery driven screwdriver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1947102A1 (de) * 1969-09-17 1971-04-08 Albert Jean Paul Elektrisch angetriebener Ratschen-Schraubschluessel
DE2513648A1 (de) * 1975-03-27 1976-09-02 Holland Letz Felo Werkzeug Ratschen-schraubendreher
US4078589A (en) * 1976-05-10 1978-03-14 Miller Walter L Battery driven screwdriver

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088836A1 (fr) * 1982-03-11 1983-09-21 Katsuyuki Totsu Tournevis électrique
FR2581913A1 (fr) * 1985-02-27 1986-11-21 Black & Decker Inc Systeme a cliquet selectivement verrouillable pour outils portatifs, en particulier outils electriques alimentes par batterie
KR101278005B1 (ko) * 2005-03-19 2013-06-27 다이스타 컬러스 디스트리뷰션 게엠베하 금속 착물 염료 혼합물
GB2445826B (en) * 2006-11-16 2010-06-09 Bosch Gmbh Robert Toolroom ratchet
US7836797B2 (en) 2006-11-16 2010-11-23 Robert Bosch Gmbh Tool ratchet
WO2023012119A1 (fr) * 2021-08-02 2023-02-09 Adolf Würth GmbH & Co. KG Clé à chocs ou à impulsions et procédé de vissage de vis

Also Published As

Publication number Publication date
CH640452A5 (de) 1984-01-13
JPS56102483A (en) 1981-08-15

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19810817

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19821220