WO1988006508A2 - Process for interrupting the operation of a hand tool, in particular percussion and/or rotation thereof - Google Patents
Process for interrupting the operation of a hand tool, in particular percussion and/or rotation thereof Download PDFInfo
- Publication number
- WO1988006508A2 WO1988006508A2 PCT/DE1988/000109 DE8800109W WO8806508A2 WO 1988006508 A2 WO1988006508 A2 WO 1988006508A2 DE 8800109 W DE8800109 W DE 8800109W WO 8806508 A2 WO8806508 A2 WO 8806508A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- clutch
- hand
- tool
- sensor
- hand tool
- Prior art date
Links
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 relates to a method for interrupting the drive activity of a hand tool according to the preamble of claim 1 or 9. It is known (DE-PS 2449191) to arrange a non-positive clutch in the form of a cone clutch in the drive train of the striking mechanism alone, which normally disengages and separates the striking mechanism from the drive train. However, if the operator presses the hand tool against the rock, the tool holder is moved backwards into the hand tool via the tool.
- This displacement movement is used via a displacement of the rotary sleeve serving for the rotary drive for the axial displacement of the driven shaft, as a result of which the cone coupling half, which is non-rotatable thereon, is pressed axially against another cone coupling half of the striking mechanism and so, when the coupling is engaged, the striking mechanism is now also driven.
- the clutch is thus automatically engaged depending on a force that the operator has to apply by firmly pressing the handheld power 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 pressure drive.
- Such safety clutches are designed, for example, 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 keeps holding the corresponding counter-moment in anticipation of this malfunction.
- these prerequisites are often not met, so that, for example, twisted or even injured wrists and arms repeatedly occur with the user of such hand-held 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 reaching of a travel position of the tool or a translationally moving part of the striking mechanism located on the idling distance is recorded as the 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 idling shutdown or automatic restart, without the user of the hand power 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 depends solely on the tool being moved from this idle position to the rear in the position corresponding to the striking operation.
- 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.
- any other idling devices or catch devices are dispensable and the method according to the invention makes it possible to have almost any short idling distances.
- the idle travel can thus be significantly reduced, which leads to faster response and to 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 are created to simplify the coupling, if necessary, since one does not necessarily have to rely on 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 blocking.
- the invention is based on the basic etching knowledge that the swiveling movement of the hand-held machine 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 about a force-dependent quantity, for example 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 21.
- a hand tool is characterized by the features in the characterizing part of claim 21.
- Advantageous further developments and improvements of such a hand-held power tool result from the features in claims 22-41.
- the hand-held 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.
- FIG. 1 is a schematic, partial axial longitudinal section of a hand power tool, in which only a few important parts of the drive train are shown in simplified form;
- Fig. 3 is a schematic representation of the
- Fig. 4 is a simplified schematic functional diagram.
- Fig. 5 is a schematic, partial axial
- FIG. 11 shows two further exemplary embodiments of a hand tool and 12 machine according to FIG. Fig. 1.
- 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 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 do not have to 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.
- a drum 18 On the shaft 17 rotatably sits a drum 18 as part of a percussion mechanism 13, the fixed Mit Meetingbo lzen 19 engages with play in a transverse bore of a pivot pin 20, which in turn is supported in a fork-shaped end of a drive piston 21.
- 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 consists, for example, of a drill. Other types of tools can also be accommodated in the tool holder 23.
- the tool 24 can be driven in a rotary manner via a rotary sleeve 25 of the transmission 12, which is only indicated schematically.
- the rotary sleeve 25 carries a gear 26, which is non-rotatable thereon, which meshes 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 exemplary embodiment shown 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, to which the shaft 17 for example, 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 thus the striking mechanism 13 stands still, even if the rotary drive which is still driven and rotating shaft 17 above is not interrupted is, 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 gearbox complex adjoining it in FIG 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 switching clutch, which, by means of the existing energy diverted from the drive motor 11, e.g. is controllable by means of electrical or electromechanical energy.
- the coupling 28 can possibly also be designed as a form-fitting coupling, for example as a claw coupling. Then the clutch 28 should the branch of the striking mechanism 13 and be arranged as shown in FIG. 1, so that when the clutch is disengaged, in addition to the striking mechanism 13, the rotary drive is also stopped. Furthermore, it is advisable to switch off and stop the drive motor 11 at the same time when the clutch 28 is disengaged, so that the clutch 28 can be re-engaged later when the clutch 28 is disengaged.
- the clutch 28 has at least one disengaged release spring 29 which is biased and locked in the engaged state and which disengages automatically when the clutch 28 is disengaged.
- the release spring 29 can be tensioned and locked again. Thus, the force to separate the two halves of the clutch 28 from the release spring 29 is supplied.
- the handheld power tool also contains a sensor 30, only indicated schematically, 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 the size of a path position of the tool 24 or a translationally moving part of the striking mechanism 13 located on the idle distance (FIG. 3) and then acts on the clutch 28 for automatic disengagement.
- the idling sensor is able to automatically detect the leaving of this position in the direction of the striking position and then the clutch 28 for automatic re-engagement to act upon.
- 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 As the variable to reach a position on the idle st rec ke of the tool 24 or a part of the striking mechanism 13 which is moved in translation is detected and when this position is reached the clutch 28 is automatically disengaged and when leaving this position the clutch 28 is automatically engaged again.
- the overall translation path of the tool 24, or for example of 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 tool 24 Due to the acting impacts, the tool 24 carries out an oscillating movement which is carried out over a distance of 1/3 of the total translation path.
- 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 path, for example, in such a way 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 the clutch 28 to the disengagement.
- the sensor 30 could be placed, for example, in the middle third of the translation path of the tool 24 or even further to the right. 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 in FIG. 3 with a solid line Lines is shown. If the sensor 30 responds when it has been overrun by the tool 24 and there is no overlap in the idle position, the sensor 30 can be arranged, for example, in the middle position, as indicated by the broken line in FIG. 3.
- the Kerngeda nke is that 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 then the clutch 2 is controlled so that it disengages. As soon as the tool 24 or said part of the striking mechanism 13 is shifted 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 handheld power tool in order to achieve the engagement of the clutch for the impact operation and the disengagement of the clutch automatically in the event of 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 leads a control pulse in the sense of disengaging the clutch to an electro-mechanical, for example electrical, actuator, in particular disengaging actuator 35. who then at the Clutch 28 engages to disengage them. After this, the tool 24 has been moved from the idle position to the striking position, then the clutch 28 is also re-engaged by the sensor 30 via the control device 34, which then in turn leads to a control pulse, for example on an actuator in the form of an engagement actuator 35, which engages clutch 28 to engage it. Like the disengaging actuator 35, the engaging actuator 36 can also be actuated by the control device 34, for example 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. designed in accordance with DE-0S 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.
- 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 consists, for example, of a drill. Other types of tools can also be accommodated in the tool holder 23.
- the tool .24 can be driven in a rotary manner via a rotary sleeve 25 of the transmission 12 which is only indicated schematically.
- the rotary sleeve 25 carries a gear 26, which is non-rotatable thereon, which meshes 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 shown only 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 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. as explained at the beginning.
- the clutch 28 is located behind the branch shown in the pure rotary drive branch, for example on the shaft 17 or between the pinion 27 and its drive from the shaft 17.
- the clutch 28 is automatically disengaged depending on an overload size with an interruption of the drive activity.
- the gearbox complex adjoining it in FIG. 5 to the left of the clutch 28 is not driven, so that in this case both the striking mechanism 13 stands still 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 disengaging this clutch 28, so that later when the clutch 28 is re-engaged in the 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 Serv ⁇ schalt 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 clutch 28 has at least one release spring 29 that is biased and locked in the engaged state and which automatically disengages the clutch 28 when the clutch 28 is released.
- the release spring 29 can be tensioned and locked again. Thus, the force to separate the two halves of the clutch 28 from the release spring 29 is supplied.
- the handheld power tool also has a sensor 130, only indicated schematically, which 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 pivoting 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 engaging set 32 which can be reached from the outside of the machine, in particular manually operated, and which, for example, consists of an actuating 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 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 brought, for example, approximately radially from the outside to both compressed coupling halves, which are overlapped together 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 is blocked in the rock, for example, the handheld power tool is thrown around in the direction of the arrow 40.
- the sensor 30 responds, which in this exemplary 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 35 in the direction of the arrow 39 and so that the claw at the end of the lever 33 is the two coupling halves Clutch 28 releases, so that the compressed release spring 29 can automatically move the clutch 28 into the disengaged position shown in FIG.
- FIG. 8 schematically shows an engagement actuator 32 which is mechanically coupled to the clutch 28 to engage it via an internal lever 37. If the clutch 28 is to be engaged again, starting from the disengaged position shown in FIG. 8, then the engagement actuator 32 is pressed, which is mechanically via the lever 37 pushes the left half in FIG. 8 by compressing the release spring 29 onto the right coupling half until the engaged position according to FIG. 9 is reached, in which the islaue at the end of the lever 33 then automatically engages over both compressed coupling halves of the clutch 28.
- control device 34 in the hand machine tool, 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.
- sensor 130 is designed as an electromechanical sensor, which activates 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 handheld power tool traverses.
- One way for example, is the swivel angle of a swiveling movement of the hand tool around Rotary drive axis 31 into consideration, the rotation sensor 30 then responding, for example, when a permissible pivoting movement of, for example, 10 ° pivoting angle, is triggered and causes the clutch 28 to disengage in the manner described.
- the speed and / or acceleration with which the hand-held power tool moves in space can also be detected by means of the sensor 130 as the movement variable.
- 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 this movement quantity is exceeded by disengaging the clutch 28. Then the drive is interrupted, so that the rotary actuation of the tool 24 stops, while the drive part located in FIG. 5 on the right of the clutch 28, in particular the drive motor 11 with gear 15, 16, can continue to rotate freely.
- the ⁇ rlaut ⁇ rt ⁇ 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 means of the overload device is always pending, 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 torque that is far too large for most of the time in anticipation of a possible blocking.
- 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 coupling 28 and tool 24, via which the named drive train can be connected to the housing 10 of the rotary hammer.
- the holding device 50 is designed as a known, electrically triggerable brake.
- 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 in addition to the rotary drive when the clutch 28 is triggered.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE88901798T DE3884522D1 (en) | 1987-03-05 | 1988-03-02 | METHOD FOR INTERRUPTING THE DRIVING ACTIVITY, IN PARTICULAR THE BLOWING AND / OR ROTATING ACTIVITY, OF A HAND MACHINE TOOL. |
EP88901798A EP0303651B2 (en) | 1987-03-05 | 1988-03-02 | Process for interrupting the operation of a hand tool, in particular percussion and/or rotation thereof |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873707052 DE3707052A1 (en) | 1987-03-05 | 1987-03-05 | Method for interrupting the drive activity, in particular rotary-drive activity, of a powered hand tool |
DE19873707051 DE3707051A1 (en) | 1987-03-05 | 1987-03-05 | Method for interrupting the drive activity, in particular at least the percussive-drive activity, of a powered hand tool |
DEP3707052.5 | 1987-03-05 | ||
DEP3707051.7 | 1987-03-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1988006508A2 true WO1988006508A2 (en) | 1988-09-07 |
WO1988006508A3 WO1988006508A3 (en) | 1988-09-22 |
Family
ID=25853140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1988/000109 WO1988006508A2 (en) | 1987-03-05 | 1988-03-02 | Process for interrupting the operation of a hand tool, in particular percussion and/or rotation thereof |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0303651B2 (en) |
DE (1) | DE3884522D1 (en) |
WO (1) | WO1988006508A2 (en) |
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EP0486843A1 (en) * | 1990-11-20 | 1992-05-27 | Robert Bosch Gmbh | Hand tool with brake coupling |
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DE102015221685A1 (en) | 2015-11-05 | 2017-05-11 | Robert Bosch Gmbh | guard |
DE102016203925A1 (en) | 2016-03-10 | 2017-09-14 | Robert Bosch Gmbh | guard |
DE102016210759A1 (en) | 2016-06-16 | 2017-12-21 | Robert Bosch Gmbh | Hand tool |
DE102017213424A1 (en) | 2017-08-02 | 2019-02-07 | Robert Bosch Gmbh | Hand tool |
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EP0486842A1 (en) * | 1990-11-20 | 1992-05-27 | Robert Bosch Gmbh | Hand tool |
EP0486843A1 (en) * | 1990-11-20 | 1992-05-27 | Robert Bosch Gmbh | Hand tool with brake coupling |
DE4344817A1 (en) * | 1993-12-28 | 1995-06-29 | Hilti Ag | Method and device for hand-held machine tools to avoid accidents due to tool blocking |
EP0666148B1 (en) * | 1993-12-28 | 1997-06-18 | HILTI Aktiengesellschaft | Method and apparatus for handheld machine tools to prevent accidents caused by blocking of the tool |
CN1042406C (en) * | 1993-12-28 | 1999-03-10 | 希尔蒂股份公司 | Method and apparatus for avoiding handtool machine from fault of clamping too tight of tool |
CN1050466C (en) * | 1994-03-10 | 2000-03-15 | C.M.L.机械制造股份有限公司 | An electric motor for portable machine tools |
EP0841126A2 (en) * | 1996-11-11 | 1998-05-13 | HILTI Aktiengesellschaft | Motor-driven hand tool with safety device in case of jammed tool |
EP0841127A2 (en) * | 1996-11-11 | 1998-05-13 | HILTI Aktiengesellschaft | Motor-driven hand tool with safety device in case of jammed tool |
EP0841127A3 (en) * | 1996-11-11 | 1999-01-13 | HILTI Aktiengesellschaft | Motor-driven hand tool with safety device in case of jammed tool |
EP0841126B1 (en) * | 1996-11-11 | 2003-03-19 | HILTI Aktiengesellschaft | Motor-driven hand tool with safety device in case of jammed tool |
DE19857061C2 (en) * | 1998-12-10 | 2000-11-02 | Hilti Ag | Method and device for avoiding accidents in hand-held machine tools due to tool blocking |
DE19857061A1 (en) * | 1998-12-10 | 2000-06-15 | Hilti Ag | Method and device for avoiding accidents in hand-held machine tools due to tool blocking |
EP1170095A2 (en) * | 2000-07-08 | 2002-01-09 | HILTI Aktiengesellschaft | Electric handtool with switching-off during idling |
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WO2002072315A1 (en) * | 2001-03-12 | 2002-09-19 | Wacker Construction Equipment Ag | Pneumatic percussive tool with a movement frequency controlled idling position |
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CN1298471C (en) * | 2001-12-12 | 2007-02-07 | 希尔蒂股份公司 | Axial-impact electric manual tools |
EP1391271A2 (en) * | 2002-08-19 | 2004-02-25 | HILTI Aktiengesellschaft | Safety device for multi-function handtool |
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EP1607186A1 (en) * | 2004-06-18 | 2005-12-21 | HILTI Aktiengesellschaft | Electro-pneumatic hammer drill / chisel hammer with modifiable impact energy |
US7681659B2 (en) | 2004-10-20 | 2010-03-23 | Black & Decker Inc. | Power tool anti-kickback system with rotational rate sensor |
US8316958B2 (en) | 2006-07-13 | 2012-11-27 | Black & Decker Inc. | Control scheme for detecting and preventing torque conditions in a power tool |
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US9211636B2 (en) | 2010-01-07 | 2015-12-15 | Black & Decker Inc. | Power tool having rotary input control |
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US9266178B2 (en) | 2010-01-07 | 2016-02-23 | Black & Decker Inc. | Power tool having rotary input control |
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US11192232B2 (en) | 2016-06-20 | 2021-12-07 | Black & Decker Inc. | Power tool with anti-kickback control system |
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Also Published As
Publication number | Publication date |
---|---|
WO1988006508A3 (en) | 1988-09-22 |
EP0303651A1 (en) | 1989-02-22 |
EP0303651B2 (en) | 1999-12-01 |
DE3884522D1 (en) | 1993-11-04 |
EP0303651B1 (en) | 1993-09-29 |
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