EP3338955A1 - Drilling and/or chipping hammer - Google Patents

Abstract

The invention relates to a drill and / or chisel hammer with at least one tool holder (12) which can be driven in rotation about at least one rotary axis (10) to receive at least one machining tool (14) and at least one drive unit (16), in particular an electric motor unit. to a drive of the tool holder (12).

It is proposed that the drill and / or chisel hammer has at least one positioning unit (18) which is intended to selectively move the tool holder (12) into at least one bit position (20) by means of the drive unit (16) at least in a bit positioning operation to turn, in particular.

Description

State of the art

It has already been a drill and / or chisel hammer with at least one rotatable about at least one rotational axis driven tool holder for receiving at least one machining tool and at least one drive unit to a drive of the tool holder, has been proposed. A positioning of a chisel in the tool holder is carried out manually.

Disclosure of the invention

The invention is based on a drill and / or chisel hammer with at least one tool holder rotatably drivable about at least one rotation axis for receiving at least one machining tool and with at least one drive unit, in particular an electric motor unit, for driving the tool receptacle.

It is proposed that the drill and / or chisel hammer has at least one positioning unit which is provided to selectively move, in particular to rotate, the tool holder by means of the drive unit in at least one bit position, at least in a bit positioning operation, in particular different from a drilling mode ,

A "tool holder" is to be understood, in particular, as a component which is intended to be a machining tool in a receiving region take and in particular in the circumferential direction to make a positive and / or non-positive connection with the machining tool. A "receiving area" is to be understood in particular as meaning a proximity area of the tool holder, which is completely filled by a machining tool clamped in a clamping unit. By "provided" is intended to be understood in particular specially programmed, designed and / or equipped. The fact that an object is intended for a specific function should in particular mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.

A "chisel positioning operation" of the drill and / or chisel hammer is preferably provided to fix at least one position of the tool holder, in particular a chisel located in the tool holder, before and / or after a chiseling, in particular by a rotation. In a "chiselling" learns a machining tool pulse surges, in particular periodic pulse bursts, which are transmitted in particular to a surface to be machined. In this case, the machining tool, in particular the chisel, should preferably remain in a predetermined, in particular rotationally fixed position, in particular a chisel position. The term "rotation-resistant" should in this case be understood in particular as meaning that the machining tool remains free of rotation, in particular free of any undesired rotation by an operator, preferably free of rotational movement about an axis of rotation which is parallel to a main extension direction of the machining tool. A "main direction of extension" of an object should be understood to mean, in particular, a direction which runs parallel to a longest edge of a smallest imaginary cuboid which just completely encloses the object. The "bit position" is to be understood in particular as a, preferably set by an operator rotation position of the tool holder. The tool holder, in particular the tip of a chisel located in the tool holder, is preferably aligned in a chisel position so as to be rotatable relative to a housing of the drill and / or chisel hammer about a rotation axis substantially parallel to the main extension direction of the drill and / or chisel hammer.

Due to the inventive design of the drill and / or chisel hammer advantageously a simplified operation can be achieved. The machining tool can in particular be brought into a desired bit position without prior disassembly and / or without prior loosening and / or contactless. As a result, increased reliability can be achieved. In particular, contactless setting of the bit position may preferably prevent possible burns by a hot working tool and / or possible bruising, for example between the machining tool and a workpiece or between the tool holder and the machining tool. Furthermore, an improved hygiene situation can also be achieved, in particular by keeping contaminations on the machining tool away from the hands of an operator. In addition, an increased user-friendliness can be achieved, since preferably a faster and / or easier adjustment of the bit position can be made possible.

It is also proposed that the tool holder, at least in the bit positioning operation, in particular by the positioning unit and / or the drive unit is gradually rotatable about the rotational axis by a partial angle step of a maximum of 30 °, in particular of at most 20 ° and preferably of at least 10 °. In this case, the phrase "stepwise" is to be understood in particular as meaning that the partial angle step specifies a minimum rotation, wherein this minimum rotation can preferably be carried out repeatedly, for example by means of a repeated actuation of a switch. As a result, advantageously, the bit position during the bit positioning operation can be variably adjusted, in particular without the operator having to change a holding position of the drill and / or chisel hammer. A frequent change of the holding position can in particular lead to unpleasant for the operator attitudes, which can be advantageously avoided. By a stepwise adjustment of the angle of rotation can advantageously be a simple and / or fast bit positioning possible. In the current state of the art, whenever the bit position is changed, the operator first had to set the chisel off the workpiece. Such a discontinuous operation can be advantageously avoided by a non-contact adjustment become. This can advantageously be achieved an increase in a work efficiency.

Preferably, a constant pitch angle step may be chosen which, when used as a denominator of 360 in a division, does not give a substantially natural number, such as 23 ° and / or 14 ° and / or 27 °. As a result, it can be advantageously achieved that new bit positions can be achieved after a complete revolution, whereby a fine adjustment of the bit position can advantageously be made possible. By a "substantially natural number" is meant in particular a non-zero, positive number, which differs in particular less than 10%, preferably less than 15% or more preferably less than 25% from a natural number. In particular, the bit position can be advantageously secured after a successful positioning by means of a mechanical locking.

Furthermore, it is proposed that the tool holder, at least in the bit positioning operation in particular by the positioning unit and / or the drive unit is at least substantially continuously rotatable about the axis of rotation with at least one speed. As a result, advantageously, the bit position can be variably adjusted, in particular without the operator having to change a holding position of the drill and / or chisel hammer. A frequent change of the holding position can in particular lead to unpleasant for the operator positions which can be advantageously avoided. By a stepwise adjustment of the angle of rotation can advantageously be a simple and / or fast bit positioning possible. In the current state of the art, whenever the bit position is changed, the operator first had to set the chisel off the workpiece. Such a discontinuous operation can be advantageously avoided by a non-contact adjustment. This can advantageously be achieved an increase in a work efficiency. Advantageously can be achieved by a setting by means of a continuous rotation of any part angle, in particular any chisel position.

If the speed has a value of at most 20 min ^-1 , in particular of at most 15 min ^-1 , advantageously of at most 10 min ^-1 , preferably of at most 5 min ^-1 and particularly preferably of at most 3 min ^-1 , can advantageously a rapid Adjusting the bit position can be enabled. By limiting the rotational speed, in particular an upper limit of the rotational speed can advantageously be avoided too fast rotation, which in particular could complicate an accurate adjustment of the bit position. A limitation of the rotational speed can preferably be achieved by means of a gear of the drill and / or chisel hammer, which in particular has a gear shift stage with a high gear ratio, and / or by means of an electronic speed limiter, for example via a microcontroller of a control unit of the drill and / or chisel hammer become.

If the rotational speed has a value of at least 1 min ^-1 , preferably at least 3 min ^-1 , preferably at least 5 min ^-1 or particularly preferably at least 10 min ^-1 , then advantageously a precise setting of the bit position can be made possible. By limiting the rotational speed, in particular a lower limit of the rotational speed, it is advantageously possible to avoid too slow rotation, which in particular could make adjustment of the bit position very time-consuming. A limitation of the rotational speed can preferably be achieved by means of the transmission, which in particular has a transmission shift stage with a high transmission ratio, and / or by means of an electronic speed limitation, for example via the microcontroller.

If a rotation of the tool holder can take place at least in the bit positioning operation, in particular by the positioning unit and / or the drive unit in both directions of rotation, advantageously a rapid setting of the bit position can be made possible. By reversing the rotational movement, advantageously a desired bit position can be approached faster. Preferably, the two directions of rotation have different maximum speeds and / or different minimum partial angle steps, whereby advantageously between a slower and / or more accurate adjustment option and a faster and / or more efficient adjustment can be selected.

In addition, it is proposed that the drive unit has an electronically commutated motor with at least two motor coils and at least one control unit for, in particular, targeted and / or individual control of at least one of the two motor coils. As a result, targeted control, in particular of at least one motor coil, can advantageously be made possible, whereby advantageously a stepwise rotation, in particular a stepwise rotation with a partial angle smaller than 360 °, can be made possible. In this case, an "electronically commutated motor" is to be understood as meaning, in particular, an electric drive, preferably an electric motor, in particular a three-phase motor, which in particular is free from sliding contacts. In particular, the electronically commutated motor is a brushless DC motor. The electronically commutated motor may in particular comprise at least one rotor, which preferably comprises at least one pole pair of a permanent magnet. In addition, the electronically commutated motor may in particular comprise a stator, which preferably has at least one electric motor coil. A "motor coil" is to be understood in particular as a spirally applied electrical conductor, which is provided in particular for generating and / or detecting a magnetic field. The control unit is in particular at least partially intended to apply an electrical voltage and / or an electrical current to at least one motor coil. In particular, the control unit may comprise at least one Hall sensor and / or at least one power transistor and / or at least one power MOSFET and / or at least one insulated gate bipolar transistor and / or at least one microcontroller and / or at least one control software.

It is also proposed that the drive unit has a transmission with at least one first gear shift stage and a second gear shift stage, and at least one readout unit for detecting the active gear shift stage. By means of at least one second gear shift stage, a gear ratio can advantageously be provided, whereby in particular different maximum torques and / or maximum rotational speeds can be made possible. This can advantageously be increased flexibility. The readout unit may advantageously have at least one Hall switch. The readout unit can advantageously at least one information transmission element have, which is preferably at least partially connected at least to the drive unit and / or at least one switch of the drill and / or hammer and which may be provided in particular to transmit information between the readout unit and the drive unit and / or the switch. It is conceivable that in addition to the detection of the active transmission shift stage, the readout unit can read and / or transmit further operating parameters, such as a blow activation / deactivation and / or a direction of rotation and / or further operating parameters of the drill and / or chisel hammer that appear reasonable to the person skilled in the art , The information transmission element may preferably be formed as at least one electrical circuit and / or as at least one mechanical component. By means of an automatic detection of a gear shift position, for example, advantageously all operating modes could be applied via a single switch. As a result, advantageously a complexity can be reduced. It is also conceivable that the information captured by the readout unit, in particular the active gear shift stage advantageously can be identified to the operator, in particular in an easily recognizable manner, for example on a display and / or by at least one light signal and / or by a combination of several flares. As a result, in particular user-friendliness and / or usability can be improved.

If the first gear shift stage provides a ratio of at least 5: 1, in particular of at least 30: 1 and preferably of at most 60: 1, advantageously a flexibility can be increased. In particular, advantageously, a simple realization of a stepwise rotation about a partial angle can be achieved. For example, if a first gear shift stage transmits a rotation of a rotor of the drive unit directly to the tool holder, then a full rotor rotation would cause a rotation of the tool holder by a partial angle of 18 °, in particular at a ratio of 20: 1. It is conceivable that in each case upon actuation of a switch, in particular in the chisel positioning operation, the rotor rotates by one revolution, whereby the machining tool would be rotated by 18 °. As a result, increased precision can advantageously be achieved, for example by enabling precise setting of the bit position. There are Also, in particular, higher translations conceivable, especially if a deep limitation of the maximum speed to be achieved by means of a gear ratio. Advantageously, by means of a gear ratio, an increased torque on the tool holder and thus in particular on the machining tool can be achieved, whereby advantageously additional application areas, in particular a mode of operation drilling can be opened.

Furthermore, it is proposed that the drill and / or chisel hammer at least one switch, in particular a key switch, a touch-sensitive switch and / or preferably a pressure switch, which activates at least one operating state upon actuation, in particular depending on at least one signal of the readout unit in which the tool ^holder rotates stepwise and / or in particular at a speed of at most 20 min ^-1 , preferably at most 15 min ^-1 , preferably at most 5 min ^-1 or more preferably at most 3 min ^-1 . In this case, a "pressure switch" is to be understood in particular as a switch which is activated by a pressure force exerted by an operator, in particular a force which acts essentially perpendicular to a switch surface, a "switch surface" preferably being a surface of the switch should be, which is particularly intended to form a contact surface for an operator. The term "substantially perpendicular" is intended here to define, in particular, an orientation of a direction relative to a reference direction, the direction and the reference direction, in particular in one plane, including an angle of 90 ° and the angle a maximum deviation of, in particular, less than 8 °, advantageously less than 5 ° and particularly advantageously less than 2 °.

It is conceivable that the same switch, in particular pressure switch, is provided for activating a plurality of operating modes, for example impact-free drilling and / or impact drilling and / or chiselling, preferably all possible operating modes. It is particularly conceivable that by means of a variable pressure, which is present in particular at the pressure switch at least one operating parameter such as the speed can be determined, thereby advantageously a more intuitive operating option can be created. By such Pressure switch advantageously improved user friendliness can be achieved, in particular by a reduced complexity of the drill and / or chisel hammer. It is conceivable that preferably an already existing switch of the drill and / or chisel hammer is designed as a pressure switch, which advantageously in addition to his / her original function / functions, the gradual and / or speed-limited rotation of the tool holder, in particular the positioning unit, activate , By means of such an embodiment, a cost reduction could advantageously be achieved, since in particular no new housing and / or switch parts must be designed and / or produced.

Furthermore, it is conceivable that in particular in an operating mode with gradual rotation of the tool holder, preferably with each actuation of the switch, in particular pressure switch, the tool holder is rotated by a partial angle and / or that in a permanent actuation of the switch, in particular pressure switch, the tool holder rotates stepwise , In particular until the pressure switch is released again, and / or that a partial angle, for example via a display and / or another switch, is adjustable, which is then approached preferably by operating the switch, in particular pressure switch, stepwise or continuously. In addition, it is conceivable that the switch, in particular pressure switch, is a separate switch, which is provided in particular exclusively for a gradual and / or speed-limited rotation of the tool holder and in particular is positioned at a different location of the housing of the drill and / or chisel hammer.

In addition, a method for positioning a bit of a drill and / or chisel hammer is proposed, with at least one rotatable about at least one rotational axis tool holder for receiving at least one machining tool and at least one drive unit, in particular an electric motor unit, to drive the tool holder, wherein the tool holder by means of the drive unit at least in a bit positioning operation moves selectively in at least one bit position, in particular rotated, is. As a result, a simplified operation can advantageously be achieved. The editing tool can in particular without prior disassembly and / or without prior loosening and / or contactless be brought into a desired bit position. As a result, increased reliability can be achieved. In particular, contactless setting of the bit position may preferably prevent possible burns by a hot working tool and / or possible bruising, for example between the machining tool and a workpiece or between the tool holder and the machining tool. Furthermore, an improved hygiene situation can also be achieved, in particular by keeping contaminations on the machining tool away from the hands of an operator. In addition, an increased user-friendliness can be achieved, since preferably a faster and / or easier adjustment of the bit position can be made possible.

The drill and / or chisel hammer should not be limited to the application and embodiment described above. In particular, for performance of a mode of operation described herein, the rotary and / or mallet hammer may have a different number than a number of individual elements, components, and units referred to herein.

drawing

Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Fig. 1

eine schematische Seitenansicht eines Bohr- und/oder Meißelhammers mit einem Meißel als Bearbeitungswerkzeug,

Fig. 2

eine schematische Frontansicht des Bohr- und/oder Meißelhammers und

Fig. 3

einen schematischen Schaltplan des Bohr- und/oder Meißelhammers mit einem elektronisch kommutierten Motor, einer Steuereinheit und zwei Schaltern.

Show it:

Fig. 1

a schematic side view of a drill and / or chisel hammer with a chisel as a machining tool,

Fig. 2

a schematic front view of the drill and / or chisel hammer and

Fig. 3

a schematic circuit diagram of the drill and / or chisel hammer with an electronically commutated motor, a control unit and two switches.

Description of the embodiment

Fig. 1 shows a drill and / or chisel hammer. The drill and / or chisel hammer has a tool holder 12. The tool holder 12 serves to receive a machining tool 14, namely a chisel 50. The chisel 50 is fastened in a rotationally fixed manner in the tool holder 12 during a chiseling. The tool holder 12 is rotatable about a rotation axis 10. A rotation of the tool holder 12 about the axis of rotation 10 can take place in both directions of rotation 24. In a chisel, a periodic pulse generated in a percussion unit 64 is transferred to the chisel 50. The pulse is directed along the axis of rotation 10 in the direction of the tool holder 12. The tool holder 12 is driven in at least one operating state by a drive unit 16 of the drill and / or chisel hammer. The drive unit 16 has an electronically commutating motor 26 and / or a transmission 36 and / or a readout unit 38.

The electronically commutated motor 26 has three motor coils 28, 32, 34 (see. Fig. 3 ). The electronically commutated motor 26 has three Hall sensors 52, 54, 56. The three Hall sensors 52, 54, 56 serve to detect the current position of the three motor coils 28, 32, 34.

The drive unit 16 has a control unit 30. The control unit 30 has a microcontroller 58 (cf. Fig. 3 ). By means of the control unit 30, in particular by means of a control software of the microcontroller 58, each motor coil 28, 32, 34 can be controlled separately.

The transmission 36 has three gear shift stages 44, 46, 48 (see. Fig. 3 ). A first gear shift stage 46 activates a positioning unit 18 of the rotary and / or chisel hammer. A second transmission shift stage 44 activates one Borhammerbetrieb. A third gear shift stage 48 activates a chisel hammer operation.

The first transmission shift stage 46 provides a ratio of at least 5: 1, in particular of at least 30: 1 and preferably of at most 60: 1, in particular relative to a rotational speed of a rotor 60 of the electronically commutated motor 26, ready (see. Figure 3 ).

A transmission switch 42 of the drill and / or chisel hammer is intended to allow switching between the first gear shift stage 46, the second gear shift stage 44 and the third gear shift stage 48.

The readout unit 38 is used to detect the active gear shift stage 44, 46, 48th

The positioning unit 18 of the drill and / or chisel hammer selectively positions the chisel 50 in a chisel position 20. The positioning by the positioning unit 18 takes place by means of the rotation of the tool holder 12.

By means of the positioning unit 18, the tool holder 12, in particular in the bit positioning operation can be rotated stepwise. A stepwise rotation takes place in each case by a fixed partial angle step 22 (cf. Fig. 2 ).

By means of the positioning unit 18, the tool holder 12, in particular in the bit positioning operation, can be rotated continuously. Continuous rotation occurs at any partial angle step 22. Continuous rotation occurs at a fixed and / or variable speed.

The rotary and / or chisel hammer may preferably comprise a change-over switch, which is provided to allow a switchover between gradual and continuous rotation. The switch may be formed as a separate switch or it may be a possible shift position of the transmission switch 42. Furthermore, it is conceivable that, alternatively, the positioning unit 18 can only perform a stepwise rotation or that the positioning unit 18 can only carry out a continuous rotation.

The drill and / or chisel hammer has a switch 40, which activates an operating state when actuated. The activated operating state corresponds to a setting made on the transmission switch 42. The activated operating state is dependent on a signal of the readout unit 38. For example, if the first gear shift stage 46 is activated, the tool holder 12 rotates stepwise and / or at a speed of at most 10 min ^-1 . The switch 40 is formed as an I / O switch. The switch 40 is operated by means of a pressure. The switch 40 is formed as a pressure switch. Upon actuation, the switch 40 moves parallel to the axis of rotation 10 in a housing of the drill and / or chisel hammer.

In a method for positioning the bit 50, the operator rotates the bit 50 locked in rotation in the tool holder 12, in particular during a bit positioning operation, by means of the positioning unit 18 into the desired position. The desired position relative to a workpiece can be set by the operator by means of a pressure on the switch 40. At a pressure on the switch 40, the tool holder 12 rotates either stepwise by a partial angle step 22 of 360 ° or the tool holder 12 rotates continuously with a limited up and down speed until the desired position is reached. In a stepwise positioning, a single pressure on the switch 40 may preferably each cause a rotation about a single partial angle step 22. The positioning unit 18 is activated by the operator by means of a gearshift switch 42. By means of the gearshift switch 42, the operator switches between the available operating modes of the rotary and / or chisel hammer, for example impact-free drilling and / or percussion drilling and / or chiselling and / or bit positioning. If a changed bit position 20 is to be set during a chisel operation, the operator temporarily stops chiseling, then activates the positioning unit 18 by means of the gearshift switch 42, then rotates the tool holder 12 with the chisel 50 and back by means of a pressure on the switch 40 a switch back to the operating mode chiseling by means of the gearshift switch 42 can be continued by pressing the switch 40, the chiselling.

Claims (11)

Drill and / or chisel hammer with at least one about at least one rotational axis (10) rotatably driven tool holder (12) for receiving at least one machining tool (14) and at least one drive unit (16), in particular an electric motor unit, to drive the tool holder ( 12), characterized by at least one positioning unit (18), which is provided to the tool holder (12) by means of the drive unit (16) at least in a bit positioning operation targeted in at least one bit position (20) to move, in particular to rotate. Drill and / or chipping hammer according to claim 1, characterized in that the tool holder (12) at least in chisel positioning operation stepwise by a partial angle step (22) of a maximum of 30 °, in particular of at most 20 ° and preferably of at least 10 ° about the axis of rotation (10 ) is rotatable. Drill and / or chisel hammer according to one of the preceding claims, characterized in that the tool holder (12) is rotatable at least in the chisel positioning operation at least substantially continuously about the axis of rotation (10) with at least one rotational speed. Drilling and / or chiselling hammer according to claim 3, characterized in that the rotational speed has a value of at most 20 min ^-1 . Drill and / or chisel hammer according to claim 3 or 4, characterized in that the rotational speed has a value of at least 1 min ^-1 . Drill and / or chisel hammer according to one of the preceding claims, characterized in that a rotation of the tool holder (12) can take place in both directions of rotation (24) at least in the chisel positioning operation. Drill and / or chisel hammer according to one of the preceding claims, characterized in that the drive unit (16) has an electronically commutated motor (26) with at least two motor coils (28, 32, 34) and at least one control unit (30) for controlling at least one having two motor coils (28). Drill and / or chisel hammer according to claim 1, characterized in that the drive unit (16) has a transmission (36) with at least one first gear shift stage (44, 46, 48) and a second gear shift stage (44, 46, 48), and at least a readout unit (38) for detecting the active gear shift stage (44, 46, 48). Drill and / or chisel hammer according to claim 8, characterized in that the first gear shift stage (44, 46, 48) provides a ratio of at least 5: 1, in particular of at least 30: 1 and preferably of at most 60: 1. Drill and / or chisel hammer at least according to claim 8, characterized by at least one switch (40), which activates at least one operating state during actuation, in particular depending on at least one signal of the readout unit (38), in which the tool holder (12) stepwise and / or rotated at a speed of at most 10 min ^-1 . Method for positioning a chisel (50) of a drill and / or chisel hammer, in particular according to one of the preceding claims, with at least one tool holder (12) which can be driven in rotation about at least one rotary axis (10) to receive at least one machining tool (14) and with at least one drive unit (16), in particular an electric motor unit, for driving the tool holder (12), characterized in that the tool holder (12) by means of the drive unit (16) at least in a bit positioning operation selectively moves in at least one bit position (20), in particular turned, will.

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