WO1996030166A1 - Outil roto-percutant a moteur - Google Patents

Outil roto-percutant a moteur Download PDF

Info

Publication number
WO1996030166A1
WO1996030166A1 PCT/DE1995/000424 DE9500424W WO9630166A1 WO 1996030166 A1 WO1996030166 A1 WO 1996030166A1 DE 9500424 W DE9500424 W DE 9500424W WO 9630166 A1 WO9630166 A1 WO 9630166A1
Authority
WO
WIPO (PCT)
Prior art keywords
flywheel
impact tool
rotary impact
power
tool according
Prior art date
Application number
PCT/DE1995/000424
Other languages
German (de)
English (en)
Inventor
Georg Baersch
Original Assignee
Georg Baersch
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 Georg Baersch filed Critical Georg Baersch
Priority to PCT/DE1995/000424 priority Critical patent/WO1996030166A1/fr
Publication of WO1996030166A1 publication Critical patent/WO1996030166A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B29/00—Apparatus or tools for mounting or dismounting wheels
    • B60B29/003—Wrenches, e.g. of the ratchet type
    • B60B29/006—Wrenches, e.g. of the ratchet type with electric or pneumatic drive
    • 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
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • 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
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • B25B21/026—Impact clutches

Definitions

  • the invention relates to a power-driven rotary impact tool for loosening and tightening bolts, screw nuts or the like according to the preamble of the main claim.
  • Such power-driven rotary impact tools are already known several times and are, for example. used in assembly in manufacturing companies, in craft businesses as well as in the DIY sector.
  • the power-driven rotary impact tools can be operated electrically or pneumatically.
  • periodic impacts are derived from the continuous starting rotary movements of the drive motor, for example in such a way that a hammer part accelerated by the motor strikes an anvil part, whereby forces or moments are achieved on the spindle that the forces or Moments on the drive motor shaft can be exceeded many times over.
  • rotary impact tools are very powerful tools with small dimensions and small mass.
  • no torque acts on the hand of the user in rotary impact tools, so that they guarantee safe handling.
  • Such rotary impact tools are, however, complex in their construction and complicated in their manufacture, so that the acquisition costs are relatively high.
  • the power-driven rotary impact tool according to the invention with the characterizing features of the main claim has the advantage over that the simple construction provides an inexpensive embodiment of a rotary impact tool which is also easy to handle.
  • This power-driven rotary impact tool can preferably be used for loosening and tightening screw bolts or threaded nuts.
  • the rotary impact tool for example, makes changing a wheel in motor vehicles considerably easier and since it is relatively small, it can also be easily accommodated in smaller vehicles.
  • the rotary impact tool has an axially displaceable output shaft which is articulated to a switchable coupling which can separate or connect the output shaft from the flywheel by means of an actuating element.
  • the clutch engages the flywheel by means of a clutch driver and thus transmits the torque of the flywheel to the output shaft.
  • the torque transmission is interrupted by the axial displacement of the output shaft and the output shaft comes to a standstill.
  • the actuator is at least one leaf spring arranged transversely to the output shaft and clamped in the housing.
  • the leaf spring is connected to the output shaft at the point that experiences the greatest deflection. It can be relaxed in the event that the output shaft is separated from the flywheel. If the rotary impact tool is pressed against a screw bolt, the leaf spring attached to the housing is deflected and ensures that the clutch engages the flywheel. The torque of the rotating flywheel is transferred to the wrench and the bolts can loosened or screwed tight. Slimming the
  • Rotary impact tool from the bolt causes the leaf spring to return to its original position, the clutch is disconnected from the flywheel, and the wrench comes to a standstill.
  • leaf spring instead of the leaf spring, other types of springs or rubber parts can be used as actuators.
  • the leaf spring is received by brackets arranged on the inside of the housing.
  • the leaf spring is held so that it extends tangentially across the output shaft. If two leaf springs are used, they are arranged parallel to each other on the right and left of the output shaft, also tangential to it.
  • a switch is arranged on the housing, on which the direction of rotation of the motor is set. Depending on which direction of rotation is selected, the rotary impact tool is used to loosen or tighten bolts.
  • a third switch position can also be provided, in which the motor is switched off. When the rotary impact tool is pressed on, the output shaft is connected to the flywheel which is now stationary, the switched-off motor preventing the output shaft from spinning. In this way, the rotary impact tool can also be used without a motor.
  • an externally operable lever is attached to the housing, which activates the actuator for separating or connecting the driving or driven parts.
  • the clutch only engages when the rotary impact tool is pressed onto the screw bolt.
  • the coupling is disc-shaped and has at least one projection which engages in the coupling driver.
  • the clutch driver arranged on the flywheel is advantageously of the same design as the projection on the clutch and runs on the same circular path as this. The torque can be transmitted if the coupling driver and the projection interlock.
  • the output shaft can be displaced in the axial direction by a stroke which corresponds at least to the height of the projection and the coupling driver. Coupling driver and projection must be so far apart in the uncoupled state that they cannot touch each other. In this way, safe handling of the rotary impact tool is guaranteed.
  • a plurality of projections can also be attached to the coupling and a plurality of coupling drivers can be attached to the flywheel.
  • the clutch is speed-controlled and connects the flywheel to the output shaft only after it has reached a minimum speed.
  • the torque of the flywheel can be suddenly transmitted to the output shaft and thus e.g. enable loosening of fixed bolts.
  • the mass of the flywheel is chosen to be relatively large.
  • the overload clutch arranged between the motor and the drive shaft is a torque-dependent clutch.
  • the overload clutch thus acts as a safety clutch for the motor after a certain limit load has been exceeded separates the motor from the drive shaft. On the one hand, this is of great importance when tightening bolts, on the other hand when a torque is required to loosen the bolts that exceeds that which the motor can apply. In both cases, the overload clutch prevents the motor from being overloaded and damage to the mechanics of the rotary impact tool.
  • the motor is driven by rechargeable batteries or low-voltage sources.
  • accumulators guarantees wireless and particularly flexible handling of the rotary impact tool.
  • the tool can also be used where there is no mains connection available.
  • the rotary impact tool is used to change a wheel
  • Cable and connector to be connected to the vehicle's cigarette lighter.
  • the output shaft is axially displaced by a linkage which is actuated by a speed-dependent trigger mechanism attached to the flywheel.
  • a speed-dependent trigger mechanism attached to the flywheel.
  • the mechanism acts on the linkage, which moves the output shaft towards the flywheel and connects it to it.
  • the output shaft and flywheel are thus coupled automatically and speed-controlled.
  • the flywheel has a bore running in the radial direction from the outside inward, the depth of which is smaller than the radius of the flywheel and a pin in the spring is attached so that it moves radially outward when the flywheel rotates and completely immerses in the bore when the flywheel is at a standstill.
  • This device corresponds to a speed-controlled trigger mechanism.
  • the bolt acts on the one hand on the spring force in the direction of the center of the disc, and on the other hand the centrifugal force, which depends on the angular velocity of the disc, acts on the outside.
  • the pin When the disc begins to rotate, the pin moves radially outward and comes to a standstill only when the force of the spring attached and deflected to the pin is as great as the centrifugal force. As soon as the bolt protrudes from the bore in its radially outward movement, it can actuate the linkage connected to the output shaft and thereby couple the output shaft to the flywheel. If the speed is reduced again, the spring force exceeds the centrifugal force and the bolt moves radially inwards again, in the direction of the center of the disc. The connection between the pin and the linkage is interrupted and the rotary impact tool is uncoupled.
  • the minimum speed of the flywheel, from which the bolt protrudes out of the bore can be adjusted by an adjustment direction.
  • the minimum speed of the flywheel from which the clutch connected to the output shaft engages the flywheel can be freely selected within the limits specified by the design of the trigger mechanism.
  • the clutch consists of a disk, along the circumference of which a jacket is arranged, which surrounds but does not touch the flywheel and on the inside of which a radially protruding projection is attached, which is attached to the clutch driver of the Flywheel attacks.
  • This clutch can also be used as an automatically speed-controlled clutch, in which case the speed-dependent trigger mechanism is advantageously attached to the flywheel and can engage in the projection on the inside of the jacket of the clutch.
  • Rotary impact tool Figure 2 shows a section through a rotary impact tool with a trigger mechanism arranged in a flywheel
  • FIG. 3 shows an alternative embodiment of a clutch and a
  • FIG. 1 shows a section through a rotary impact tool 1 according to the invention.
  • This has a housing, for example made of plastic, in which a motor 3 is arranged. It is preferably an electric motor.
  • the motor 3 drives a flywheel 5 via a drive shaft 4 which is as large as possible Has mass.
  • a torque-dependent overload clutch 6 which, as soon as the torque at this point exceeds a limit value which can be set at the switch 29, separates the motor from the flywheel.
  • the clutch 8 and the output shaft 9 are arranged so that they can be moved axially.
  • a receptacle 11 is provided, onto which different wrenches 12, such as a socket for loosening wheel nuts or bolts, can be plugged.
  • a leaf spring 13 is fastened to brackets 14, which is connected to the output shaft 9 at the point experiencing the greatest deflection.
  • the deflection of the leaf spring 13 takes place in the axial direction - with respect to the axis of rotation 7 - towards or away from the flywheel 5.
  • the output shaft 9 connected to the spring is moved towards or away from the flywheel 5, whereby in one case it is connected to the flywheel 5 via the coupling 8 and the disc rotates the shaft is transmitted and in the other case is separated from the flywheel 5 and comes to a standstill.
  • the disk-shaped clutch 8 engages via the projection 17 on the clutch driver 18, which is attached to the flywheel 5.
  • the path covered by the output shaft 9 and the coupling 8 when the leaf spring 13 is deflected must be greater than the extension of the projection 17 and coupling driver 18 in the axial direction, so that the two parts cannot touch or influence one another in the uncoupled state. If the clutch 8 engages the flywheel 5, it will Transfer the torque of the flywheel 5 to the output shaft 9 and the wrench 12 attached to it.
  • the deflection 16 of the leaf spring 13 takes place by pressing the rotary impact tool 1 against a screw bolt.
  • the torque of the flywheel 5 is transmitted to the wrench 12 and the screw bolt is screwed or loosened. This depends on the direction of rotation of the motor 3 set on the switch 21.
  • the leaf spring 13 automatically returns to its starting position 15 and the clutch 8 is separated from the flywheel 5.
  • connection between the clutch 8 and the flywheel 5 can be established or released by actuating the lever 22.
  • the electric motor 3 is connected to a low-voltage source through the connection 19. There is also the option of installing 2 batteries in the housing.
  • the rotary impact tool 1 shown in FIG. 2 is equipped with a speed-controlled trigger mechanism 23.
  • the flywheel 5 has a bore 25 running in the radial direction from the outside inwards, the depth of which is smaller than the radius of the flywheel 5.
  • a bolt 24 is fastened via a helical spring.
  • the bolt 24 moves on account of it attacking centrifugal force, which exceeds the spring force depending on the speed of the flywheel 5, radially outwards.
  • the bolt 24 protrudes from the bore, it can press against the linkage 27, which acts on the output shaft 9 and ensures that the clutch disc 8 is connected to the flywheel 5.
  • an adjusting mechanism 26 is accommodated in the additional bore running parallel to the axis of rotation 7, with the aid of which it can be set from which minimum speed of the flywheel 5 the clutch should act on it.
  • the adjusting mechanism 26 consists of a spring-loaded locking element which presses against the bolt 24.
  • FIG. 3 shows another embodiment of a clutch and a flywheel as an alternative to the rotary impact tools shown in FIGS. 1 and 2.
  • the clutch 8 consists of a disk along the circumference of which a jacket 28 is arranged, which at least partially encompasses the flywheel 5, but does not touch it.
  • the clutch driver is equipped with a speed-controlled trigger mechanism 23.
  • a spring-mounted bolt 24 moves radially outward when the flywheel 5 rotates and engages the projection 17. If the speed of the flywheel 5 is reduced, the bolt 24 is pulled back by the spring.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

Un outil roto-percutant (1) à moteur utile pour desserrer et serrer des boulons ou des écrous filetés comprend un carter (2) dans lequel est monté un moteur (3) qui au moyen d'un arbre d'entraînement (4) entraîne un volant (5) dont le couple est transmis par un accouplement (8) à un arbre de sortie (9). L'accouplement (8) et l'arbre de sortie (9) sont mobiles dans le sens axial et l'accouplement (8) peut être enclenché par un organe d'actionnement (13).
PCT/DE1995/000424 1995-03-29 1995-03-29 Outil roto-percutant a moteur WO1996030166A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE1995/000424 WO1996030166A1 (fr) 1995-03-29 1995-03-29 Outil roto-percutant a moteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1995/000424 WO1996030166A1 (fr) 1995-03-29 1995-03-29 Outil roto-percutant a moteur

Publications (1)

Publication Number Publication Date
WO1996030166A1 true WO1996030166A1 (fr) 1996-10-03

Family

ID=6918196

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/000424 WO1996030166A1 (fr) 1995-03-29 1995-03-29 Outil roto-percutant a moteur

Country Status (1)

Country Link
WO (1) WO1996030166A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012091172A1 (fr) * 2010-12-28 2012-07-05 Hitachi Koki Co., Ltd. Outil d'entraînement
CN106739793A (zh) * 2016-12-30 2017-05-31 广东技术师范学院 一种新型汽车轮胎拆装工具

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR661723A (fr) * 1928-09-17 1929-07-29 Independent Pneumatic Tool Co Perfectionnements aux dispositifs de serrage de vis ou d'écrous, dispositifs applicables aux outils rotatifs, portatifs actionnés mécaniquement
US2373664A (en) * 1941-12-17 1945-04-17 Rotor Tool Company Impact clutch
FR2066788A5 (fr) * 1969-12-13 1971-08-06 Bosch
FR2631575A1 (fr) * 1988-05-17 1989-11-24 Etma Sa Dispositif pour le desserrage ou le serrage des ecrous et boulons
US5158354A (en) * 1990-02-07 1992-10-27 Spiranyl S.A.R.L. Device for screwing and unscrewing screws, bolts and nuts
GB2274416A (en) * 1993-01-22 1994-07-27 Bosch Gmbh Robert Percussion screwdriver
DE4427893A1 (de) * 1993-08-19 1995-03-30 Georg Baersch Kraftangetriebenes Drehschlagwerkzeug

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR661723A (fr) * 1928-09-17 1929-07-29 Independent Pneumatic Tool Co Perfectionnements aux dispositifs de serrage de vis ou d'écrous, dispositifs applicables aux outils rotatifs, portatifs actionnés mécaniquement
US2373664A (en) * 1941-12-17 1945-04-17 Rotor Tool Company Impact clutch
FR2066788A5 (fr) * 1969-12-13 1971-08-06 Bosch
FR2631575A1 (fr) * 1988-05-17 1989-11-24 Etma Sa Dispositif pour le desserrage ou le serrage des ecrous et boulons
US5158354A (en) * 1990-02-07 1992-10-27 Spiranyl S.A.R.L. Device for screwing and unscrewing screws, bolts and nuts
GB2274416A (en) * 1993-01-22 1994-07-27 Bosch Gmbh Robert Percussion screwdriver
DE4427893A1 (de) * 1993-08-19 1995-03-30 Georg Baersch Kraftangetriebenes Drehschlagwerkzeug

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012091172A1 (fr) * 2010-12-28 2012-07-05 Hitachi Koki Co., Ltd. Outil d'entraînement
CN103269832A (zh) * 2010-12-28 2013-08-28 日立工机株式会社 驱动工具
CN106739793A (zh) * 2016-12-30 2017-05-31 广东技术师范学院 一种新型汽车轮胎拆装工具

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