EP0303651B1 - Procede d'interruption de l'entrainement, en particulier en percussion et/ou en rotation, d'un outil a main - Google Patents

Procede d'interruption de l'entrainement, en particulier en percussion et/ou en rotation, d'un outil a main Download PDF

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Publication number
EP0303651B1
EP0303651B1 EP88901798A EP88901798A EP0303651B1 EP 0303651 B1 EP0303651 B1 EP 0303651B1 EP 88901798 A EP88901798 A EP 88901798A EP 88901798 A EP88901798 A EP 88901798A EP 0303651 B1 EP0303651 B1 EP 0303651B1
Authority
EP
European Patent Office
Prior art keywords
hand
coupling
machine tool
operated machine
drive
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
Application number
EP88901798A
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German (de)
English (en)
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EP0303651A1 (fr
EP0303651B2 (fr
Inventor
Wolfgang Schmid
Ludwig Thome
Karl Wanner
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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
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Priority claimed from DE19873707051 external-priority patent/DE3707051A1/de
Priority claimed from DE19873707052 external-priority patent/DE3707052A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0303651A1 publication Critical patent/EP0303651A1/fr
Application granted granted Critical
Publication of EP0303651B1 publication Critical patent/EP0303651B1/fr
Publication of EP0303651B2 publication Critical patent/EP0303651B2/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
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/061—Swash-plate actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/131—Idling mode of tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/221—Sensors

Definitions

  • the invention is based on a method for interrupting the drive activity of a handheld power tool according to the generic preamble of claims 1 or 3.
  • EP 150 669 A2 already discloses such a handheld power tool with a container accommodated in its interior, in which an electrically conductive, liquid mass is located. This mass is penetrated by a magnetic field, which induces an electrical voltage that can be picked up from electrodes when the machine rotates. The measurement of the inertial forces is only possible with a relatively large expenditure on equipment. In addition, if the machine is intended to move, the safety clutch can also be triggered incorrectly.
  • the clutch is thus automatically engaged depending on a force that the operator has to apply by firmly pressing the hand tool. This makes handling difficult.
  • relatively large idling distances must be provided on the machine side, which is not only impractical for handling, but also increases the axial length.
  • a safety clutch as a clutch in the drive train, which responds when a certain transmitted torque is reached and then separates the rotary drive.
  • Such safety couplings are e.g. designed as slip clutches, friction clutches or releasable clutches.
  • Such safety clutches respond depending on the force. This works well if the user of the hand-held machine tool is prepared for the moment that suddenly occurs in the event of a blockage and the hand-held machine tool is constantly holding the corresponding counter-moment in anticipation of this malfunction.
  • these requirements are often not met, so that e.g. twisted or even injured wrists and arms occur repeatedly when using such handheld power tools, in particular rotary hammers.
  • the method according to the invention with the characterizing features of claim 1 has the following advantages. Since the achievement of a travel position of the tool or a translationally moving part of the striking mechanism located on the idling distance is recorded as a variable and the clutch is automatically disengaged when this travel position is reached and automatically engaged when leaving this travel position, there is an automatic idle shutdown or automatic restart, without the user of the hand tool having to apply any additional operating forces or, in particular, engagement forces. Rather, the disengagement of the clutch depends solely on the displacement of the tool forward into the idle position, just as the engagement of the clutch again depends solely on the fact that the tool is moved backwards from this idle position to the position corresponding to the striking mode.
  • the user can therefore work loosely and relaxed, without having to constantly apply special pressing forces to maintain the percussion drive.
  • the handling of the hand machine tool is considerably simplified. Greater ease of use is achieved. It is also advantageous that any other idling devices or catching devices are unnecessary and that the method according to the invention enables almost any short idling distances.
  • the idle travel can thus be significantly reduced, which leads to a faster response and to a more direct operation of the hand tool.
  • a reduction in the axial length in the axial direction of the tool holder is also possible.
  • the prerequisites have been created for simplifying the coupling, if necessary, since it is not absolutely necessary to use a cone coupling with cone halves that can be pressed axially against one another.
  • the z. B. can consist of a path and / or a speed and / or an acceleration, and since the clutch is automatically disengaged when a predetermined value of such a movement size is exceeded, there is always the same safety for the user of the hand tool, regardless of the drive torque Hand tool that the user applies with the holding torque. The user does not need to have a holding moment that is far too large for most of the time in anticipation of a block.
  • the invention is based on the fundamental knowledge that the pivoting movement of the hand-held power tool, in particular a rotary hammer, which occurs when a rotating tool is blocked, itself as a signal for the interruption of the drive activity, in particular rotary drive activity, and not for this purpose a force-dependent variable, e.g. B. a torque in the power flow of the rotary drive.
  • a force-dependent variable e.g. B. a torque in the power flow of the rotary drive.
  • the invention further relates to a hand tool with the features in the preamble of claim 11.
  • a hand tool is characterized by the features in the characterizing part of claim 11.
  • Advantageous further developments and improvements of such a handheld power tool result from the features in claims 12-29.
  • the handheld power tool designed in this way is relatively simple in construction and inexpensive. Since it has the advantages explained at the outset, this justifies the overall little additional effort, also with regard to the reliable safety achieved and easier handling for the user.
  • a hand tool is shown schematically, which here consists of a hammer drill or which can instead consist of a pure hammer for chisel operation.
  • hammers are generally known (DE-AS 12 06 817).
  • the hammer drill shown has a housing 10 in which an electric drive motor 11, which is designed as a universal motor, a gear 12 and a striking mechanism 13 are also arranged.
  • the hammer drill is e.g. designed in accordance with DE-OS 28 20 128, to which express reference is made here, so that particular details of the transmission 12 and the striking mechanism 13 need not be explained in detail.
  • the drive motor 11 carries on the motor shaft 14 a motor pinion 15 which is in engagement with a gear 16 which is held on a shaft 17 in a rotationally fixed manner.
  • the drive piston 21 is designed as a hollow piston and acts via an air cushion on a striker 22 movably mounted therein.
  • the tool 24 is e.g. from a drill. Other types of tools can also be accommodated in the tool holder 23.
  • the tool 24 can be driven in rotation by means of a rotating sleeve 25 of the transmission 12, which is only indicated schematically.
  • the rotary sleeve 25 carries a gear 26 which is non-rotatable thereon and which is in engagement with a pinion 27 which is non-rotatably or coupled to the shaft 17 via a special safety coupling.
  • a safety clutch in one embodiment is e.g. described in DE-OS 28 20 128, to which reference can be made here.
  • a special clutch 28 is arranged in the drive train from the engine 11 to the tool 24, which is shown only schematically here.
  • This clutch is arranged in the rotary drive drive train in front of the branch of the striking mechanism 13. It is namely in the embodiment shown between the gear part 15 driven by the motor pinion 15 in the form of the gear 16 and the shaft 17 on the one hand and the gear train driving the striking mechanism 13 on the other hand, to which the shaft 17 e.g. rotatable drum 18 and the driven parts of the striking mechanism 13, which are explained at the beginning.
  • the coupling 28 is instead behind the branch shown, where it is arranged in the pure percussion drive branch, e.g. between the shaft 17 on the one hand and the drum 18 on the other hand, so that when the clutch 28 is disengaged, the drive of the drum 18 is interrupted and the striking mechanism 13 stands still, even if the rotary drive which is still driven and rotating shaft 17 above is not interrupted, but is still effective.
  • the clutch 28 is automatically disengaged depending on a size with an interruption of the driving activity of at least the striking mechanism 13. In this case, the gear complex adjoining the clutch 28 in FIG. 1 is not driven, so that in this case, in addition to the striking mechanism 13, which stands still, then also the drive rotating the rotating sleeve 25 and the tool 24 also stands still. If the clutch 28 is instead arranged between the shaft 17 and the drum 18, only the striking mechanism 13 stands still when the clutch 28 is disengaged.
  • the clutch 28 is designed here as a clutch. It consists in particular of a non-positive clutch, e.g. from a friction clutch.
  • the clutch 28 is designed as a servo clutch, which uses the existing energy diverted from the drive motor 11, e.g. is controllable by means of electrical or electromechanical energy.
  • the coupling 28 may also be a form-fitting one Be designed clutch, for example as a claw clutch. Then the clutch 28 should be arranged in front of the branch of the striking mechanism 13 and as shown in FIG. 1, so that when the clutch is disengaged, the rotary drive is also stopped in addition to the striking mechanism 13. Furthermore, it is recommended that the drive motor 11 is then also switched off and stopped when the clutch 28 is disengaged so that the clutch 28 can be re-engaged later when the clutch 28 is disengaged.
  • the handheld power tool also contains a sensor 30, which is only indicated schematically and which is fixedly arranged in the interior of the housing 10.
  • the sensor 30 is designed in particular as an electrical sensor. However, it can also be designed as a mechanical or electromechanical sensor instead.
  • the sensor 30 is in operative connection with the clutch 28 and acts on the clutch 28 as soon as it responds.
  • the sensor 30 is designed as an idle sensor, which detects as a quantity the position of the tool 24 or a part of the striking mechanism 13 that is in the idle distance (FIG. 3) and which is moved in translation, and then acts on the clutch 28 for automatic disengagement.
  • the idle sensor is able to automatically detect the leaving of this path position in the direction of the striking position and then to apply the clutch 28 for automatic re-engagement.
  • the senor 30 is e.g. designed as an electrical limit switch.
  • a control device 34 e.g. a switching logic, with which the sensor 30 is connected, wherein the sensor 30 can activate the control device 34 when activated.
  • the sensor 30 can e.g. be designed as an electromagnetic sensor which activates the control device 34 when said path position is reached.
  • the control device 34 is in turn in operative connection with the clutch 28 for disengaging and reinserting it (FIGS. 2, 4). If the sensor 30 responds, the control device 34 is activated, which in turn controls the clutch 28 electrically or electromechanically, e.g. electromagnetic, disengages.
  • the sensor 30 With the hand-held power tool designed in this way, it is possible for the sensor 30 to be used as a variable to detect reaching a position on the idle path of the tool 24 or a translationally moving part of the striking mechanism 13 and when this position is reached the clutch 28 is automatically disengaged and at Leaving this path position, the clutch 28 is automatically engaged again.
  • the overall translation path of the tool 24 - or for example the reciprocatingly driven drive piston 21 - during impact operation corresponds to a distance of considerable length, which can only be approximately 22 mm, for example.
  • the sensor 30 is e.g. B. not placed in this area, but, seen in Figure 3 from right to left, at least in the second or better still in the third third and thus on an area that the tool 24 or a reciprocatingly driven part of the striking mechanism 13th only reached in idle position.
  • the sensor 30 is placed on this idle line, for example, so that it is passed by the tool 24 going into the idle position and in the idle position the end of the tool 24 is on the left and at a distance from the sensor 30, so that the sensor 30 uses this as a criterion for idle operation and the application of clutch 28 to disengage.
  • the sensor 30 could, for example, in the middle third of the translation path of the tool 24 or also be placed further to the right of it. It depends on the design of the sensor 30 where it is ultimately located. If the sensor 30 responds when the tool is, for example, in overlap with it, the sensor 30 is reliably placed at a suitable point on the idling path, for example in the last third, as shown by solid lines in FIG. 3. If the sensor 30 responds when it has been overrun by the tool 24 and there is no overlap with it in the idle position, the sensor 30 can be arranged, for example, in the middle position, as indicated by dashed lines in FIG. 3.
  • the main idea is that the idling position of the tool 24 or a reciprocating part of the striking mechanism 13 is detected by the sensor 30 during impact operation and the clutch 28 is then actuated so that it disengages. As soon as the tool 24 or said part of the striking mechanism 13 is moved from this idling position to the right into the striking position by movement in FIGS. 1, 3, this is also detected by the sensor 30 and the clutch 28 is acted upon to re-engage. For everything, it does not depend on any force to be exerted by the user of the hand-held power tool in order to achieve the engagement of the clutch for the impact operation and the disengagement of the clutch automatically when idling.
  • FIG. 2 and in particular 4 it is indicated how the sensor 30 acts indirectly on the clutch 28. If the sensor 30 responds when the idling position has been reached, the sensor 30 activates the control device 34, in particular switching logic, which in turn then sends a control pulse in the sense of disengaging the clutch to an electromechanical, e.g. electric actuator, in particular disengaging actuator 35, which then engages the clutch 28 to disengage it. If after this the tool 24 has been shifted from the idling position to the striking position, the clutch 28 is also engaged again by the sensor 30 via the control device 34, which in turn then generates a control pulse e.g. leads to an actuator in the form of an engagement actuator 36 which engages the clutch 28 to engage it. Like the disengaging actuator 35, the engaging actuator 36 can be controlled by the control device 34 e.g. be operated electromechanically, in particular electromagnetically.
  • the control device 34 e.g. be operated electromechanically, in particular electromagnetically.
  • a hand tool is shown schematically, which here consists of a hammer drill.
  • the hammer drill has a housing 10 in which an electric drive motor 11, which is designed as a universal motor, a gear 12 and a striking mechanism 13 are arranged.
  • the hammer drill is e.g. designed in accordance with DE-OS 28 20 128, to which express reference is made here, so that special details of the transmission 12 and the striking mechanism 13 need not be explained.
  • the drive motor 11 carries on the motor shaft 14 a motor pinion 15 which is in engagement with a gear 16 which is held on a shaft 17 in a rotationally fixed manner.
  • the drive piston 21 is designed as a hollow piston and acts via an air cushion on a striker 22 movably mounted therein.
  • the tool 24 is e.g. from a drill. Other types of tools can also be accommodated in the tool holder 23.
  • the tool 24 can be driven in rotation by means of a rotating sleeve 25 of the transmission 12, which is only indicated schematically.
  • the rotary sleeve 25 carries a gear 26 which is non-rotatable thereon and which is in engagement with a pinion 27 which is non-rotatably or coupled to the shaft 17 via a special safety coupling.
  • a safety clutch is also described in DE-OS 28 20 128 to which reference is made.
  • a special coupling 28 is arranged in the drive train from the drive motor 11 to the tool 14, which is only shown schematically here.
  • This clutch 28 is arranged in the rotary drive drive train in front of the branch of the striking mechanism 13. It is namely between the gear part driven by the motor pinion 15 in the form of the gear wheel 16 and the shaft 17 on the one hand and the gear train driving the striking mechanism 13 on the other hand, in the form of the drum 18 which is rotationally fixed to the shaft 17 and the parts of the striking mechanism 13 driven thereby, such as is explained at the beginning.
  • the clutch 28 is located behind the branch shown in the pure rotary drive branch, e.g. on the shaft 17 or between the pinion 27 and its drive from the shaft 17th
  • the clutch 28 is automatically disengaged depending on an overload size with an interruption of the drive activity.
  • the gearbox complex adjoining it on the left in FIG. 5 is not driven, so that in this case both the striking mechanism 13 is stationary and the drive rotating the rotating sleeve 25 and the tool 24.
  • the clutch 28 is designed as a clutch. This can e.g. be designed as a positive coupling, in this case e.g. as a claw coupling. Then it is advisable to also switch off and stop the drive motor 11 when this clutch 28 is disengaged, so that later when the clutch 28 is re-engaged, the disengagement can take place in a manner described above.
  • the clutch 28 can, as shown, be designed as a non-positive clutch, e.g. as a friction clutch.
  • the clutch 28 is designed as a servo clutch, which by means of the existing energy diverted from the drive motor 11, e.g. is controllable by means of electrical or electro-mechanical energy.
  • the hand-held power tool also has a sensor 130, which is only indicated schematically and is fixedly connected to the housing 10, and is expediently located in the interior of the housing 10.
  • the sensor 130 is designed as an electrical or mechanical or electromechanical sensor.
  • the sensor 130 is operatively connected to the clutch 28 (Fig. 6-10) and acts on the clutch 28 when a movement size of the hand-held hand tool is exceeded.
  • the sensor 130 is designed as a rotation sensor which, as a movement variable, detects the path and / or the speed and / or the acceleration of an external swiveling movement of the hand-held hand-held power tool in space around a rotary drive axis 31 of the driven tool 24.
  • the hand-held power tool also has an engagement adjuster 32 which can be reached from the outside of the machine, in particular manually operated, and which, e.g. consists of an operating button. If the clutch 28 has been disengaged, it can be re-engaged directly or indirectly and mechanically, electrically or electromagnetically by means of the engagement actuator 32.
  • the sensor 130 is designed as a mechanical inertia switch and mechanically coupled to the clutch 28 to disengage it via an indicated lever 33.
  • the lever 33 bearing the sensor 30 at the end is held freely pivotable in the housing 10 about a schematically indicated pivot axis 38, which runs approximately parallel to the central axis of the clutch 28, an approximately U-shaped claw at the end of the lever 33 being so dimensioned and is designed so that it can hold the clutch 28 in the engaged state according to FIGS. 9 and 10 in this engaged state.
  • the claw is e.g. Approximately radially from the outside to both compressed clutch halves which are jointly overlapped by the claw so that the release spring 29 remains in the compressed state and the clutch 28 cannot disengage.
  • the direction of rotation of the tool 24 is symbolized schematically by arrow 41. If the tool 24 e.g. blocked in the rock, the handheld power tool is hurled around in the direction of arrow 40.
  • the sensor 30 responds, which in this embodiment, as a mechanical inertia switch, together with the lever 33 and the claw engaging on the clutch 28 is pivoted about the pivot axis 38 in the direction of arrow 39 and so that the claw at the end of the lever 33 both coupling halves releases the clutch 28 so that the compressed release spring 29 can automatically move the clutch 28 into the disengaged position shown in FIG. 8.
  • FIG. 8 schematically shows an engagement actuator 32, which is mechanically coupled to the clutch 28 to engage it via its own lever 37. If the clutch 28 is to be engaged again, starting from the disengaged position according to FIG. 8, the engagement actuator 32 is pressed, which mechanically pushes the left half in FIG. 8 by pressing the release spring 29 against the right clutch half via the lever 37, until the engaged position according to FIG. 9 is reached, in which the claw at the end of the lever 33 then automatically engages over both compressed coupling halves of the clutch 28.
  • a control device 34 e.g. a switching logic, with which both the sensor 130 and the engagement actuator 32 are connected, each of which can activate the control device when it becomes effective.
  • the sensor 130 is designed as an electromechanical sensor, which activates the control device 34 in the event of an overload.
  • the control device 34 is in turn in operative connection with the clutch 28 for disengaging and reinserting it (FIGS. 6, 7). If the sensor 130 responds, the control device 34 is activated, which in turn controls the clutch 28 electrically or electromechanically, e.g. electromagnetic, disengages. If the engagement actuator 32 is then actuated from the outside and there is no overload, the actuation of the engagement actuator 32 likewise activates the control device 34, which now controls the clutch 28 in the sense of re-engagement.
  • the sensor 130 can be designed such that it detects, as a movement variable, a path that the hand-held power tool traverses.
  • a path is, for example, the swivel angle of a swivel movement of the hand-held power tool about the rotary drive axis 31, the rotation sensor 30 then responding, for example when a permissible swivel movement of, for example, 10 ° swivel angle is exceeded and disengaging the clutch 28 in the manner described.
  • the speed and / or acceleration with which the hand-held power tool moves in space can also be detected as a movement variable by means of the sensor 130.
  • the main idea here is to use the rotation of the housing 10 of the hand-held power tool when the driven tool 24 is blocked - in other words, it receives an angular momentum - as a signal for switching off the rotary drive when the movement quantity is exceeded by disengaging the clutch 28. Then the rotary drive is interrupted so that the rotary actuation of the tool 24 stops, while the drive part located in FIG. 5 to the right of the clutch 28, in particular the drive motor 11 with gear 15, 16, can continue to rotate freely.
  • the overload device ensures that inadmissible twisting of the hand-held power tool and thus the hand of the user holding it with the risk of injuries associated with it are prevented.
  • the safety guaranteed by the overload device is always reliable, regardless of the working torque of the hand tool that the user applies with the holding torque. The user therefore does not need to have a holding moment that is far too large for most of the time in anticipation of a possible blocking.
  • clutch 28 When actuated directly, clutch 28 is disengaged mechanically the lever 33.
  • the sensor 130 activates the control device 34, in particular switching logic, when the predetermined value of the movement quantity is exceeded, which in turn then generates a control pulse in the sense of disengaging the clutch on an electromechanical, for example electrical, actuator, in particular disengaging actuator 35 , which then engages the clutch 28 to disengage it. If, after this, the value of the movement quantity which caused the clutch 28 to disengage has been undershot, the clutch 28 is re-engaged, for example by manually pressing in the engagement adjuster 32, which is then directly or indirectly and mechan isch, electrically or electromechanically causes the clutch 28 to be re-engaged.
  • the clutch 28 is immediately and mechanically re-engaged by means of the engagement actuator 32 6 and 7, on the other hand, the control device 34, in particular switching logic, is activated by, for example, manually pressing in the engagement actuator 32, which then in turn leads to a control pulse, for example on an actuator in the form of an engagement actuator 36, which is connected to the clutch 28 attacks to engage them.
  • the engagement actuator 36 is actuated by the control device 34, for example electromechanically, in particular electromagnetically.
  • FIGS. 11 and 12 show two further exemplary embodiments of the invention.
  • FIG. 11 shows a hammer drill in which the clutch 28 is arranged behind the striking mechanism.
  • a holding device 50 in the drive train between the coupling 28 and the tool 24, via which the named drive train can be connected to the housing 10 of the hammer drill.
  • the holding device 50 is designed as a known, electrically triggerable brake.
  • the brake 50 which is actuated at the same time, ultimately firmly connects the housing of the rotary hammer to the tool 24.
  • the angular momentum which was given, for example, when the drilling tool 24 was blocked in the workpiece in the housing 10 and which led to the release of the clutch 28, can be caught. Injuries to the operator by the described angular momentum are thus reliably avoided.
  • the clutch 28 and the holding device are already in the drive train between the motor 11 and the striking mechanism.
  • the striking mechanism is also stopped when the clutch 28 is triggered.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

Un procédé permet de mettre hors circuit pendant la marche à vide un marteau perforateur et/ou un trépan à tranchement. Un embrayage (28) agencé au moins dans la chaîne cinématique de percussion est automatiquement désengagé lorsque le point mort est atteint. Le moment où l'outil (24) atteint une position située sur la course de marche à vide est détecté et l'embrayage (28) est automatiquement désengagé lorsque cette position est atteinte et enclenché à nouveau lorsque l'outil quitte cette position. A cet effet, un détecteur de marche à vide (30) provoque électromécaniquement l'engagement et le désengagement de l'embrayage (28) par l'intermédiaire d'un dispositif de commande (34). L'ouvrier maniant le marteau perforateur n'a donc pas besoin d'exercer d'efforts supplémentaires d'actionnement ou d'embrayage afin de mettre en et hors circuit l'outil à percussion, ce qui réduit le temps de marche à vide.

Claims (29)

1. Procédé d'interruption de l'entraînement en percussion d'une machine manuelle, dans la ligne de transmission reliant le moteur (11) à l'outil (24) entraîné en percussion et/ou en rotation, un embrayage (28) monté dans la ligne d'entraînement débrayant lorsque l'on atteint une grandeur prédéterminée, détectée par un capteur (30), cette grandeur, indépendante de la force de maintien exercée par l'utilisateur, représentant une grandeur de mouvement d'une partie de la machine manuelle ou de l'outil (24), partie en mouvement de translation, caractérisé en ce que la grandeur de mouvement, détectée, étant la position de déplacement d'une partie du mécanisme de frappe ou de l'outil (24) et l'embrayage (28) s'embraye automatiquement de nouveau lorsqu'on quitte cette position de déplacement, le capteur (30) activant une installation de commande (34), notamment une logique de commutation, lorsqu'on atteint cette position de déplacement, cette installation de commande transmettant une impulsion de commande à un moyen d'entraînement de réglage (35), notamment électromécanique, par exemple électromagnétique, notamment un moyen de débrayage, agissant sur l'embrayage (28) pour en commander le débrayage.
2. Procédé selon la revendication 1, caractérisé en ce que le capteur (30) active l'installation de commande (34), notamment la logique de commutation, en quittant la position de déplacement en direction de la position de percussion et l'installation de commande (34) transmet à son tour une impulsion de commande à un moyen d'entraînement de réglage (38), notamment électromécanique, par exemple électromagnétique, notamment un moyen d'embrayage qui agit sur l'embrayage (28) pour l'embrayer.
3. Procédé d'interruption de l'entraînement en rotation d'une machine manuelle, dans la ligne de transmission reliant le moteur (11) à l'outil (24) entraîné en percussion et/ou en rotation, selon lequel, un embrayage prévu dans la ligne de transmission est débrayé automatiquement en fonction d'une grandeur prédéterminée, détectée par un capteur (30), la grandeur, indépendante de la force de maintien exercée par l'utilisateur, représentant une grandeur de mouvement de la machine manuelle, prise dans son ensemble ou de parties entraînées par celle-ci, procédé caractérisé en ce que la grandeur de mouvement détectée est une course exécutée par la machine manuelle.
4. Procédé d'interruption de l'entraînement en rotation d'une machine manuelle dans la ligne de transmission reliant le moteur (11) à l'outil (24) entraîné en percussion et/ou en rotation, selon lequel, un embrayage prévu dans la ligne de transmission débrayant lorqu'on atteint une grandeur prédéterminée, détectée par un capteur (30), cette grandeur étant indépendante de la force de maintien exercée par l'utilisateur représentant une grandeur de mouvement de la machine manuelle prise dans son ensemble ou de parties entraînées par cette machine, procédé caractérisé en ce que la grandeur de mouvement est la vitesse à laquelle se déplace la machine manuelle guidée à la main, dans l'espace.
5. Procédé d'interruption de l'entraînement en rotation d'une machine manuelle dans la ligne de transmission reliant le moteur (11) à l'outil (24) entraîné en percussion et/ou en rotation, selon lequel, un embrayage prévu dans la ligne de transmission débrayant lorqu'on atteint une grandeur prédéterminée, détectée par un capteur (30), cette grandeur étant indépendante de la force de maintien exercée par l'utilisateur représentant une grandeur de mouvement de la machine manuelle prise dans son ensemble ou de parties entraînées par cette machine, caractérisé en ce que, comme grandeur de mouvement, on détecte l'accélération de la machine manuelle dans l'espace.
6. Procédé selon l'une des revendications précédentes, caractérisé en ce que le capteur (30) débraye directement et mécaniquement l'embrayage (28) lors du dépassement de la valeur prédéterminée de la grandeur de mouvement.
7. Procédé selon l'une des revendications précédentes 3 à 5, caractérisé en ce qu'en cas de dépassement de la valeur prédéterminée de la grandeur de mouvement, le capteur (30) active une installation de commande (34), notamment une logique de commutation qui transmet à son tour une impulsion de commande, notamment un moyen d'entraînement de réglage (35) électromécanique par exemple électromagnétique, notamment un moyen de débrayage, qui agit sur l'embrayage (28) pour le débrayer.
8. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'après débrayage de l'embrayage (28) et pour passer en-dessous de la valeur prédéterminée de la grandeur de mouvement, l'embrayage (28) peut le cas échéant être embrayé, en particulier par commande manuelle, d'un organe d'embrayage (32), d'une manière mécanique, électrique ou électromagnétique, directe ou indirecte.
9. Procédé selon la revendication 8, caractérisé en ce que l'organe d'embrayage (32) embraye l'embrayage (28) directement et de manière mécanique.
10. Procédé selon la revendication 9, caractérisé en ce que lorsqu'il est actionné, l'organe d'embrayage (32) active l'installation de commande (34), notamment la logique de commutation, qui transmet à son tour une impulsion de commande à un moyen d'entraînement de réglage (36), notamment électromécanique, par exemple électromagnétique, notamment un moyen d'embrayage qui agit sur l'embrayage (28) pour embrayer.
11. Machine manuelle, notamment perforateur, dont la ligne de transmission reliant le moteur (11) à l'outil (24) comporte un embrayage, qui peut être débrayé pour interrompre l'entraînement en percussion, en fonction d'une grandeur mesurée, notamment pour la mise en oeuvre du procédé selon la revendication 1, caractérisée en ce que l'embrayage est constitué par un embrayage (28) de liaison par la forme ou par la force et notamment la machine manuelle comporte un capteur (30) électrique, mécanique ou électromécanique, monté de préférence fixe, qui détecte la position de marche à vide lors de l'entraînement en percussion, et coopère avec l'embrayage de commutation (28) et agit sur celui-ci pour débrayer automatiquement lorsqu'on dépasse la grandeur mesurée.
12. Machine manuelle, notamment perforateur, dont la ligne de transmission reliant le moteur (11) à l'outil entraîné (24) comporte un embrayage, qui peut être débrayé automatiquement pour interrompre l'entraînement en rotation en fonction d'une grandeur mesurée, notamment pour la mise en oeuvre du procédé selon les revendications 3, 4 ou 5, caractérisée en ce que l'embrayage est un embrayage (28) à liaison par la forme ou par la force et la machine manuelle comporte notamment un capteur électrique, mécanique ou électromécanique (30), monté de préférence fixe, qui coopère avec l'embrayage (28), l'embrayage étant un embrayage à ressort actionné de manière électromagnétique lors du dépassement de la grandeur et le capteur (30) sollicite l'embrayage (28) pour le débrayer automatiquement lors du dépassement de la grandeur mesurée.
13. Machine manuelle selon la revendication 11 ou 12, caractérisée en ce que le capteur (30) est un commutateur de fin de course.
14. Machine manuelle selon l'une des revendications 11 à 13, caractérisée en ce que le capteur (30) est un capteur électromagnétique coopérant avec une installation de commande (34), notamment une logique de commutation, à l'intérieur de la machine manuelle, et qui active cette installation lorsqu'on atteint la position de déplacement et en ce que l'installation de commande (34) coopère avec l'embrayage (28) pour débrayer et embrayer de nouveau.
15. Machine manuelle selon l'une des revendications 11 à 14, caractérisée en ce que l'embrayage (28) est un embrayage asservi actionné en prenant de l'énergie électrique ou électromécanique du moteur (11) de la machine manuelle.
16. Machine manuelle selon l'une des revendications 11 à 15, caractérisée par un moyen d'entraînement de réglage, notamment un moyen de débrayage (35) et/ou un moyen d'embrayage (36) électromécanique, notamment électromagnétique, pour l'embrayage (28) et qui est commandé par l'installation de commande (34).
17. Machine manuelle selon l'une des revendications 11 à 16, caractérisée en ce que l'embrayage (28) comporte au moins un ressort de débrayage (29) précontraint et verrouillé à l'état embrayé, qui débraye automatiquement l'embrayage (28) lorsque le débrayage est actionné, en se détendant, et qui se tend et se verrouille de nouveau lors de la manoeuvre d'embrayage de l'embrayage (28).
18. Machine manuelle selon l'une des revendications 11 à 17, caractérisée en ce que l'embrayage (28) est prévu dans la ligne de transmission du mécanisme de frappe ou notamment dans la ligne de transmission de l'entraînement en rotation, de préférence en amont de sa dérivation vers l'entraînement en percussion du perforateur.
19. Machine manuelle selon la revendication 18, caractérisée en ce que l'embrayage (28) est prévu dans la ligne de transmission entre, d'une part, la transmission (16, 17) entraînée à partir du pignon (15) du moteur et, d'autre part, la transmission reliée au mécanisme de percussion (13).
20. Machine manuelle selon la revendication 12, caractérisée en ce que le capteur (30) est un capteur de torsion qui mesure comme grandeur de mouvement, la course et/ou la vitesse et/ou l'accélération d'un mouvement de pivotement extérieur à la machine guidée manuellement, dans l'espace, autour d'un axe d'entraînement en rotation (31) de l'outil (24) entraîné.
21. Machine manuelle selon la revendication 20, caractérisée en ce que le capteur (30) est un capteur mécanique à inertie.
22. Machine manuelle selon la revendication 21, caractérisée en ce que le capteur mécanique à inertie est couplé mécaniquement par un levier (33) à l'embrayage (28) pour en assurer le débrayage et coopère avec celui-ci.
23. Machine manuelle selon l'une des revendications 12, 14, 20, 21 ou 22, caractérisée par un organe d'embrayage (32) qui se commande de l'extérieur de la machine, notamment un organe de commande manuelle, qui permet d'embrayer de nouveau l'embrayage (28), directement ou indirectement, de manière mécanique, électrique ou électromécanique.
24. Machine manuelle selon la revendication 23, caractérisée en ce que l'organe d'embrayage (32) est couplé mécaniquement par un levier (37) à l'embrayage (28) pour assurer le mouvement d'embrayage en coopèrant avec cet embrayage.
25. Machine manuelle selon la revendication 23, caractérisée en ce que l'organe d'embrayage (32) est relié à l'installation de commande (34), notamment à la logique de commutation, et cette logique est activée lorsque l'organe est manoeuvré.
26. Machine manuelle selon l'une des revendications 12, 17, 20 à 25, caractérisée en ce que l'embrayage (28) est prévu dans la ligne de transmission de l'entraînement en rotation, en amont ou en aval de sa dérivation, vers l'entraînement du perforateur.
27. Machine manuelle selon la revendication 26, caractérisée en ce que l'embrayage (28) est prévu dans la ligne de transmission entre, d'une part, la transmission (16, 17) entraînée en sortie par le pignon (15) du moteur, et, d'autre part, la ligne de transmission reliée à l'outil de percussion (13).
28. Machine manuelle selon l'une des revendications précédentes, caractérisée en ce que la ligne d'entraînement est reliée entre l'embrayage (28) et l'outil (24) par une installation de maintien (50), notamment un frein, pour être reliée au boîtier (10) de la machine manuelle lorsque la ligne de transmission vers le moteur (11) est interrompue par l'embrayage (28).
29. Machine manuelle selon la revendication 28, caractérisée en ce que l'installation de maintien (50) relie la ligne de transmission pour l'entraînement en rotation de l'outil (24) et/ou le mécanisme de percussion (13) avec le boîtier de la machine manuelle.
EP88901798A 1987-03-05 1988-03-02 Procede d'interruption de l'entrainement, en particulier en percussion et/ou en rotation, d'un outil a main Expired - Lifetime EP0303651B2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE3707051 1987-03-05
DE19873707051 DE3707051A1 (de) 1987-03-05 1987-03-05 Verfahren zum unterbrechen der antriebstaetigkeit, insbesondere zumindest der schlagantriebstaetigkeit, einer handwerkzeugmaschine
DE3707052 1987-03-05
DE19873707052 DE3707052A1 (de) 1987-03-05 1987-03-05 Verfahren zum unterbrechen der antriebstaetigkeit, insbesondere drehantriebstaetigkeit, einer handwerkzeugmaschine
PCT/DE1988/000109 WO1988006508A2 (fr) 1987-03-05 1988-03-02 Procede d'interruption de l'entrainement, en particulier en percussion et/ou en rotation, d'un outil a main

Publications (3)

Publication Number Publication Date
EP0303651A1 EP0303651A1 (fr) 1989-02-22
EP0303651B1 true EP0303651B1 (fr) 1993-09-29
EP0303651B2 EP0303651B2 (fr) 1999-12-01

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EP88901798A Expired - Lifetime EP0303651B2 (fr) 1987-03-05 1988-03-02 Procede d'interruption de l'entrainement, en particulier en percussion et/ou en rotation, d'un outil a main

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Country Link
EP (1) EP0303651B2 (fr)
DE (1) DE3884522D1 (fr)
WO (1) WO1988006508A2 (fr)

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WO2008107251A1 (fr) * 2007-03-02 2008-09-12 Robert Bosch Gmbh Machine-outil portative
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EP0771619A2 (fr) * 1995-11-02 1997-05-07 Robert Bosch Gmbh Procédé d'interruption de l'entraînementd'un outil à main et outil à main correspondant
EP0771619B1 (fr) * 1995-11-02 2001-12-05 Robert Bosch Gmbh Procédé d'interruption de l'entraínement d'un outil à main et outil à main correspondant
WO2008107251A1 (fr) * 2007-03-02 2008-09-12 Robert Bosch Gmbh Machine-outil portative
DE102009000515A1 (de) 2009-01-30 2010-08-05 Hilti Aktiengesellschaft Steuerungsverfahren und Handwerkzeugmaschine

Also Published As

Publication number Publication date
EP0303651A1 (fr) 1989-02-22
EP0303651B2 (fr) 1999-12-01
WO1988006508A3 (fr) 1988-09-22
DE3884522D1 (de) 1993-11-04
WO1988006508A2 (fr) 1988-09-07

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