Safety operating device and machine tool system having a safety operating device

Abstract

The invention relates to a safety operating device (10) for operating a machine tool (12), in particular a hand-held machine tool, having at least one operating unit (14), in particular an emergency brake unit, for actuating the machine tool (12), which operating unit is designed to be moved in a sequence of at least two different actuating movements from one another. The invention proposes a pre-activation unit (16), which is designed to release the activation of the machine tool (12) by means of an actuation of the operating unit (14).

Description

Background Technology

[0001] A safety operating device for operating machine tools, especially handheld machine tools, has been proposed, having at least one operating unit, especially an emergency braking unit, for operating the machine tool, said safety operating device being configured to move in a sequence of at least two different operating movements. Summary of the Invention

[0002] The present invention relates to a safety operating device for operating a machine tool, particularly a handheld machine tool, having at least one operating unit, particularly an emergency braking unit, for operating the machine tool, the safety operating device being configured to move in a sequence of at least two different operating movements.

[0003] The present invention proposes a safety operating device having a pre-activation unit configured to release the activation of the machine tool by means of operation of the operating unit.

[0004] The machine tool is particularly configured as a handheld machine tool, preferably an electric handheld machine tool. In particular, the machine tool is configured as an angle grinder. A safety operating device is particularly provided for use in the handheld machine tool. The safety operating device is preferably at least partially arranged on the housing unit of the handheld machine tool. In particular, the safety operating device can be arranged on the handle of the handheld machine tool. The operating unit is preferably arranged on the housing unit of the handheld machine tool. The operating unit is particularly configured as an emergency braking device, especially preferably a two-way emergency braking device. The operating unit is particularly configured for sustained operation during operation. Preferably, the operating unit enters an initial position, especially a stopped position, when no operation is required. At least two different operating movements are particularly capable of being formed by different types of movement, such as translational and rotational movements, and / or having different orientations. These operating movements are particularly capable of extending laterally to each other in their directions. The operating movements can particularly be performed by the operator of the machine tool. A pre-activation unit is spatially arranged, particularly at a certain distance, next to the operating unit, particularly on the housing unit of the handheld machine tool, so that the pre-activation unit and the operating unit can be reached by hand, preferably by fingers. Preferably, the pre-activation unit is configured to at least temporarily place the safety operating device in a pre-activation state, particularly a standby state, in which the machine tool can be activated by operation of the operating unit. The pre-activation unit being "configured to release the activation of the machine tool by operation of the operating unit" should be understood in particular as: the activation of the machine tool by the operating unit can only be achieved in the pre-activation state triggered by the pre-activation unit. In particular, at least one operating movement of the operating unit is possible in all operating states of the safety operating device, wherein, in particular, at least one operating movement performed in the deactivated state of the safety operating device does not trigger the activation of the machine tool. The deactivated state of the safety operating device should be understood in particular as: the pre-activation unit of the safety operating device is in an unoperated state, and the activation of the machine tool is prohibited. The deactivated machine tool can be achieved, in particular, by re-operating the pre-activation unit. The safety operating device particularly has a display unit. The display unit is particularly configured as a user interface. The display unit particularly has at least one light-emitting element. The light-emitting element is particularly configured as an LED. The display unit is particularly configured to display to the operator the status and / or fault notification and / or charging status of the pre-activation unit and / or the operating unit. The display unit is specifically configured to display a pre-activated state. Preferably, the display unit flashes when the pre-activated unit is operated. Preferably, the display unit emits light in the pre-activated state. Particularly preferably, the display unit is inactive when the machine tool is in a stopped state.

[0005] The safe operation of the handheld machine tool can be ensured by the configuration of the safety operating device according to the present invention. Furthermore, undesirable manipulation of the handheld machine tool can be avoided.

[0006] Furthermore, a control or regulation unit is proposed, having at least one signal element, wherein a pre-activation unit has at least one pre-activation element configured to be operatively connected to the signal element for initiating a pre-activation state. "Control or regulation unit" should be understood in particular as a unit having a processor unit and a memory unit, and an executable program stored in the memory unit. The control or regulation unit can be configured in particular as a processor, especially as a microcontroller, or other control or regulation units that are meaningful to those skilled in the art. The signal element can be configured in particular as a microswitch or the like. The signal element is configured to generate a pre-activation signal upon contact with the pre-activation element. The signal element transmits the pre-activation signal to the control or regulation unit. The "pre-activation signal" should be understood as an electrical signal generated by the pre-activation element through electrical contact with the signal element. The pre-activation element is configured in particular as a pressing element, a pushing element, a tilting element, a sensor element, or other pre-activation elements that are meaningful to those skilled in the art. Preferably, the pre-activation signal places the safety operating device in a pre-activation state. In principle, the pre-activation element can also be configured as a touchpad or similar device, wherein the signal element is integrated, at least partially, into the pre-activation unit. The control or adjustment unit is connected, in particular, to the display unit. This provides advantageous pre-activation and / or locking functions. Advantageously, this also prevents unplanned activation of the machine tool.

[0007] Furthermore, a control or adjustment unit is proposed, having at least one additional signal element, wherein the operating unit has an operating element configured to operatively connect with the additional signal element at the end of the final actuation movement of the operating unit. The operating element particularly has an actuation element configured to actuate the additional signal element. The additional signal element is particularly constructed as a miniature switch or the like. The additional signal element particularly generates an operating signal. An "operating signal" should be understood as an electrically activated signal generated through electrical contact between the additional signal element and the actuation element of the operating unit. The signal switching element is particularly constructed separately from the additional signal element. However, it is also conceivable that the signal element and the additional signal element are implemented as a single signal element, transmitting two separate contact points and two independent signals. The operating element is particularly rotatably supported about a rotation axis. Preferably, the operating element is radially translatably supported about the rotation axis. In principle, the operating element can also be conceivably configured as a touchpad or the like. This advantageously provides a machine tool that is safe for the user.

[0008] Furthermore, it is proposed that the first actuating movement of the operating element includes a movement of at least a partial rotation about a rotation axis, and the second actuating movement of the operating element includes a translational movement radially to the rotation axis, wherein the second actuating movement is configured to activate the machine tool in a pre-activated state. The safety operating device preferably has a chute unit for guiding the operating element. The chute unit is at least partially arranged on the housing unit of the machine tool. The operating element is at least partially arranged inside the chute unit. The chute unit is particularly configured to guide the operating element in a movement of at least a partial rotation about a rotation axis. Furthermore, the chute unit is particularly configured to enable a second actuating movement of the operating element that is radially to the rotation axis and translates. The operating unit has a receiving element that is fixedly arranged on the housing unit relative to the housing unit. The receiving element has a recess that is particularly configured to at least partially receive the operating element. The operating element is particularly movably supported in the receiving unit by a fixing element. The fixing element is particularly constructed as a pin or the like. The longitudinal axis of the fixing element is particularly the rotation axis of the operating unit. The first actuating movement is particularly performed from an initial position of the operating unit. The first actuating movement particularly has a final position. This final position is defined, in particular, by a stop on the operating element on the housing unit. The second operating movement is performed, starting from the final position of the first operating movement. The operating element is rotatably supported, in particular, about the axis of rotation. Preferably, the operating element is supported radially and translationally about the axis of rotation. This provides a particularly advantageous and safe operation of the handheld machine tool for the user.

[0009] Furthermore, it is proposed that the operating unit has a spring element configured to bring the operating unit into an initial position. The spring element is particularly constructed as a helical compression spring or the like. Preferably, the spring element is arranged around the operating element of the operating unit. In particular, the spring element is arranged on the operating unit in a form-locking, force-locking, and / or material-locking manner. The connection between the spring element and the operating unit is configured to establish a restoring force of the spring element relative to the receiving element when the operating element is manipulated. The spring element is configured to return the operating element to the initial position by means of a radial restoring force and a translational restoring force. The spring element is slightly bent, particularly in the initial position of the operating unit. This advantageously allows the existing restoring force to be achieved in the initial position of the operating unit, and thus provides suitable resistance for the operation of the operating element. This, in particular, eliminates the need for other spring elements, such as those that would translate the operating element back to the initial position. This results in an advantageously compact structural configuration.

[0010] Furthermore, a guide unit is proposed, configured to prevent a second maneuver of the operating unit during the first maneuver of the operating unit and to enable the second maneuver of the operating unit at the end of the first maneuver. "The guide unit prevents the second maneuver of the operating unit during the first maneuver" should be understood in particular as: the guide unit acts at least partially below the operating element of the operating unit, thereby particularly preventing pressing movements in the area of ​​the guide unit. The second maneuver of the operating unit at the end of the first maneuver is particularly enabled by the guide unit being bounded, particularly up to approximately half of the slide unit of the safety operating device. The guide unit particularly at least partially bounds a housing recess of the machine tool. The housing recess is configured to receive the operating element of the operating unit. The guide unit particularly has a profile that is at least substantially U-shaped from the operator's perspective, wherein, in particular, the U-shaped opening describes the interface between the initial position of the operating element and the final position of the first maneuver of the operating element. This advantageously achieves compliance with the standard requirements for angle grinders IEC FDIS 62841-2-3IEC2020 and therefore for handheld machine tools for user safety.

[0011] Furthermore, at least one blocking unit is proposed, which is at least partially arranged on the guide unit, and is configured to block the feed to the final position of the first maneuver during the first maneuver, under the influence of a force acting on the maneuver unit radially to the rotation axis of the maneuver unit. Preferably, the blocking unit can block at least one maneuver by means of friction, which is generated particularly under the influence of a force acting on the maneuver unit radially to the rotation axis of the maneuver unit. Particularly preferred is that the blocking unit is constructed as mechanical resistance, particularly as a material protrusion and / or stop. This blocking is particularly achieved by a form-locking connection between the operating element of the maneuver unit and the blocking unit. The operating element of the maneuver unit particularly has a bent portion configured to form a form-locking connection with the blocking unit. The blocking unit is particularly arranged at the interface between the initial position of the operating element and the final position of the first maneuver on the guide unit. The blocking unit is particularly constructed as a lifting protrusion or the like. The guide unit particularly describes a guide surface that is particularly aligned with the movement trajectory of the operating element and translated relative to the rotation axis of the maneuver unit. The blocking unit is located in particular within the one guide surface and is configured to block movement along the one guide surface. The blocking unit describes a further guide surface, which coincides in particular with the one guide surface. This further guide surface is positioned on the blocking unit. Both guide surfaces describe radial clearance. The first actuating movement of the operating unit is achieved, in particular, by a force acting on the operating element of the operating unit, which is at least substantially translated relative to the axis of rotation of the operating unit. The first actuating movement of the operating unit occurs, in particular, along and / or on the further guide surface. During the first actuating movement, under the influence of a force acting on the operating element of the operating unit, which is radially directed relative to the axis of rotation of the operating unit, the operating element moves radially across the one guide surface. Preferably, the first actuating movement is blocked on the one guide surface by the blocking unit. This advantageously provides a child safety device and / or a machine tool for user safety.

[0012] Furthermore, it is proposed that the control or adjustment unit is configured to end the pre-activation state of the pre-activation unit after a defined time period when the operating unit is inactive, and to prevent activation of the machine tool via the operating unit. Preferably, the defined time period is a duration of at least 20 seconds, preferably at least 25 seconds, and preferably at most 60 seconds, particularly preferably at most 30 seconds. In particular, in the pre-activation state, the pre-activation state can be deactivated and the safety operating device can be switched to a deactivated state by re-operating the pre-activation unit. Re-pre-activation via the pre-activation unit is particularly necessary. This advantageously provides safe operation of the machine tool for the user.

[0013] Furthermore, the present invention relates to a machine tool system having at least one machine tool, particularly an angle grinder, machine tool accessories, particularly grinding wheels, and at least one safety operating device according to the invention. Preferably, the machine tool can be operated with electrical power. Preferably, the machine tool includes additional components, particularly those necessary for the operation of the machine tool. In particular, the machine tool may include at least one energy supply unit (e.g., a battery, mains cable, or the like), a housing, and / or other components that are meaningful to those skilled in the art. Preferably, the machine tool is constructed as an angle grinder. The machine tool is configured for operative connection with a machine tool accessory. The machine tool accessory may be constructed, in particular, as a grinding wheel, a carbide grinding wheel, a cutting wheel, particularly a protective device with a ratchet, or the like. Furthermore, the machine tool accessory particularly has an outer diameter of less than or equal to 50 mm. The machine tool accessory particularly preferably has a retaining recess with a diameter particularly less than 15 mm, preferably exactly 12 mm. The protective device is particularly replaceable and / or adjustable via a ratchet and preferably constructed as a grinding and / or cutting protective device, particularly with a dust extraction device, or as a protective device, particularly with a depth stop device or a manual cutting protective device. Particularly preferably, the machine tool attachment is configured for fastening to the machine tool by means of screws or the like. Alternatively, it is conceivable that the machine tool may be constructed as a jib saw, a drill, or other machine tool that would be meaningful to those skilled in the art. Advantageously, a compact and user-safe machine tool can be provided.

[0014] Furthermore, it is proposed that the machine tool has a drive unit, wherein the operation unit is configured to activate the drive unit according to the switching state of the pre-activation unit during operation. Preferably, the drive unit of the machine tool, especially at least one motor of the drive unit, is controlled and / or regulated, especially activated, by a control or adjustment unit based on an evaluation of the positional characteristic parameters of the pre-activation unit and the operation unit. Preferably, a signal unit provides positional characteristic parameters of the signal elements in the form of electrical or electronic signals. The machine tool preferably has an energy storage unit. The energy storage unit may be constructed as a battery or the like. The energy storage unit is preferably operatively connected to the pre-activation unit. The machine tool preferably has a supply unit, which is particularly configured to supply energy from the energy storage unit to different components of the machine tool. The machine tool preferably has a charging unit, which is operatively connected to the energy storage unit, especially for an integrated charging control device. In particular, the energy storage unit provides current to the supply unit and / or the charging unit. The supply unit provides current, especially to the control or adjustment unit and / or to the display unit. The pre-activation unit triggers a pre-activation signal, which is at least transmitted to the control or adjustment unit during operation. The control or regulation unit transmits a pre-activation signal to the display unit. The operation unit triggers an operation signal during operation, which is also transmitted to the control or regulation unit. The operation signal is specifically configured to turn functions on or off. The machine tool has at least one drive unit, which is specifically configured to control the interaction between different components, particularly between the control or regulation unit and, for example, the drive unit. The machine tool particularly has a power stage unit, which is preferably configured for battery separation, particularly between the energy storage unit and the drive unit. The power stage unit particularly has at least one transistor element. The transistor element is particularly configured as a metal-oxide-semiconductor field-effect transistor (MOSFET), which particularly has at least one gate circuit. When the machine tool is pre-activated by means of the pre-activation unit and the operation unit triggers the operation signal at the end of the second operation movement of the operation element, the gate circuit of one transistor element is preferably in a closed state. In the open state, this gate circuit is configured to interrupt the energy supply from the energy storage unit to the drive unit of the machine tool, preferably at the positive terminal. Another gate circuit of another transistor element is configured in the open state to interrupt the energy supply from the energy storage unit to the drive unit of the machine tool, preferably at the negative terminal. In the initial state of the operating unit, all poles from the energy storage unit to the drive unit are interrupted. The safety operating device particularly includes at least one sensor unit configured to detect characteristic parameters of the machine tool and / or machine tool system and preferably transmit them to the control or regulation unit. Characteristic parameters may in particular describe voltage, current intensity, and / or temperature. The control or regulation unit particularly includes software functions such as soft start, braking function, speed limit, maintaining a constant speed range, and / or data readout or the like.The machine tool has a DC voltage intermediate circuit, which is specifically configured to electrically couple multiple power grids at an intermediate current or voltage level as an energy storage device. Advantageously, this allows for the reliable functioning of complex handheld machine tools.

[0015] Here, the safety operating device according to the present invention should not be limited to the applications and embodiments described above. In particular, the safety operating device according to the present invention may have a different number than the various elements, components, and units mentioned herein in order to fulfill the functional modes described herein. Furthermore, values ​​within the ranges given in this disclosure should also be considered as disclosed and can be used arbitrarily. Attached Figure Description

[0016] Other advantages are illustrated in the following figures, which depict embodiments of the invention. The figures, description, and claims contain a large number of combinations of features. Those skilled in the art can also suitably consider these features individually and conclude other meaningful combinations.

[0017] The attached diagram shows:

[0018] Figure 1 A machine tool having a safety operating device according to the present invention is illustrated in the schematic diagram.

[0019] Figure 2 The safety operating device according to the invention in the off-duty state is shown schematically in a top view of the machine tool housing.

[0020] Figure 3 A schematic cross-sectional view of the safety operation device according to the invention in a deactivated state is shown.

[0021] Figure 4 The safety operating device according to the invention at the end of the second operating motion is shown schematically in a top view of the machine tool housing.

[0022] Figure 5 A schematic cross-sectional view of the safety operating device according to the invention at the end of the second maneuver is shown.

[0023] Figure 6 A schematic functional block diagram of a machine tool having a safety operating device according to the present invention is shown.

[0024] Figure 7 The operating elements of the safety operating device according to the present invention are shown in detail.

[0025] Figure 8 The schematic diagram illustrates the operating elements of the safety operating device according to the invention in its initial position.

[0026] Figure 9The schematic diagram illustrates the operating elements at the end of the first maneuver.

[0027] Figure 10 The schematic diagram illustrates the operating element under the influence of a force radially directed toward the rotation axis of the operating unit in a blocking state. Detailed Implementation

[0028] Figure 1 A machine tool system 36 is schematically shown, comprising a machine tool 12 and a machine tool accessory 38, and a safety operating device 10 according to the invention. The machine tool 12 is particularly configured as an angle grinder. The machine tool system 36 is configured to receive the machine tool accessory 38. The machine tool accessory 38 is configured as a grinding wheel. The machine tool accessory 38 may also be configured as a cutting wheel or the like. The machine tool system 36 has a spindle locking device 42. The machine tool system 36 has a housing unit 44. The safety operating device 10 has an operating unit 14. The operating unit 14 is configured as an emergency braking device. The operating unit 14 is configured as a bidirectional emergency braking device. The operating unit 14 has an operating element 26. The safety operating device 10 has a pre-activation unit 16. The pre-activation unit 16 has a pre-activation element 22. The operating unit 14 is configured to activate the machine tool 12 according to the pre-activation state of the pre-activation unit 16 by means of at least two actuating movements of the operating element 26 performed by the operator. The safety operating device 10 has a display unit 70.

[0029] Figure 2From the operator's perspective, the pre-activation element 22 and the operating element 26 are shown in the initial position. The machine tool 12 is in a deactivated state. The display unit 70 has at least one light-emitting element 78. The light-emitting element 78 is configured as an LED. The light-emitting element 78 is configured to display to the operator the status of the pre-activation unit 16 and / or fault warnings and / or the charging status of the machine tool 12. The display unit 70 is inactive in the deactivated state. The pre-activation element 22 is at least partially arranged on the housing unit 44. The operating element 26 is at least partially arranged on the housing unit 44. The housing unit 44 has at least one housing recess 46, 48. The safety operating device 10 is arranged on the housing unit 44 in a manner accessible to the operator at least partially through at least one housing recess 46, 48. The safety operating device 10 has a sliding groove unit 114. The sliding groove unit 114 is arranged on another housing recess 48. The sliding groove unit 114 limits the other housing recess 48. A pre-activation element 22 is disposed in a housing recess 46 of a housing unit 44. The housing unit 44 defines the housing recess 46. The housing recess 46 has a circular profile. The housing unit 44 is configured by means of the housing recess 46 to release the axial actuation movement of the pre-activation element 22. The housing unit 44 has a further housing recess 48. The operating element 26 is at least partially disposed in the further housing recess 48. A slide unit 114 defines the further housing recess 48. The further housing recess 48 has an elongated, hole-like profile. The slide unit 114 is configured by means of the further housing recess 48 to release rotational actuation movement about the rotation axis of the operating unit 14. The safety operating device 10 has a guide unit 32. The guide unit 32 is configured to release the first actuation movement of the operating element 26. The guide unit 32 is configured to prevent a second actuation movement of the operating element 26 in its initial position. The guide unit 32 is disposed on the slide unit 114. The guide unit 32 is disposed inside a separate housing recess 48 on the slide unit 114. The guide unit 32 is disposed in a U-shape on the housing unit 44 on the side of the separate housing recess 48 facing the pre-activation unit 16. There is no guide unit 32 on the side of the separate housing recess 48 facing away from the pre-activation unit 16. The safety operating device 10 has a blocking unit 34. The blocking unit 34 is constructed as a lifting protrusion. The blocking unit 34 is at least partially disposed on the guide unit 32. The blocking unit 34 is configured to block the first actuation movement of the operating element 26 under the influence of a force acting on the operating element 26 radially in the direction of the rotation axis of the operating unit 14.

[0030] Figure 3 The longitudinal section shows the... Figure 2The diagram shows a cross-sectional view of the safety operating device 10. The pre-activation unit 16 has a reset element 50 disposed on the pre-activation element 22. The reset element 50 is configured to reset the pre-activation element 22 to its initial position after actuation. The safety operating device 10 has a control or adjustment unit 18. The control or adjustment unit 18 has at least one signal element 20, 24. The signal element 20 is configured to operatively connect with the pre-activation unit 16. The additional signal element 24 is configured to operatively connect with the operating unit 14. The signal element 20 is disposed within the safety operating device 10 near the space of the pre-activation unit 16. The additional signal element 24 is disposed within the safety operating device 10 near the space of the operating unit 14. The signal element 20 and the additional signal element 24 are configured as miniature switches. The signal element 20 is configured to transmit the actuation of the pre-activation unit 16 as an electrical signal to the control or adjustment unit 18. The additional signal element 24 is configured to transmit the actuation of the operating unit 14 to the control or adjustment unit 18 after contact with the additional signal element 24.

[0031] The operating unit 14 has a receiving element 52. The receiving element 52 is configured to movably fix the operating element 26 relative to the housing unit 44 of the machine tool 12. The receiving element 52 has at least two receiving surfaces 54, 56 that are at least substantially transverse to each other. The receiving surface 54, at least substantially parallel to the longitudinal axis of the operating element 26, is configured to fix the operating unit 14 to the housing unit 44. The other receiving surface 56, at least substantially transverse to the longitudinal axis of the operating element 26, has a recess 58. The operating element 26 is at least partially disposed within the recess 58. The operating unit 14 has a spring element 30 configured to reset the operating element 26 to an initial position. The spring element 30 is arranged around the operating element 26. The operating element 26 is arranged coaxially with the spring element 30. The spring element 30 is disposed on the other receiving surface 56, at least substantially transverse to the longitudinal axis of the operating element 26.

[0032] The operating unit 14 has a fixing element 60. The fixing element 60 is constructed as a pin. An additional receiving surface 56 is configured to at least partially receive the fixing element 60. The operating element 26 has an elongated recess 62. The fixing element 60 engages in the elongated recess 62 of the operating element 26. The operating element 26 is configured for axial actuation by means of the elongated recess 62. During the axial actuation, the spring element 30 is compressed and generates a restoring force. By means of the restoring force of the spring element 30, the operating element can be reset to its original position. Figure 3In the initial position shown, the operating unit 14 has a cover element 64 configured to cover an additional housing recess 48 of the housing unit 44, in which the operating element 26 is disposed. The cover element 64 has a curved portion. The cover element 64 is disposed on the operating element 26. The operating unit 14 has an actuating element 66. The actuating element 66 is disposed on the operating element 26. The actuating element 66 is disposed on the operating element 26 below the side of the cover element 64 facing the rotation axis 28. The actuating element 66 is configured to actuate an additional signal element 24 of the control or adjustment unit 18 during axial actuating movement of the operating element 26.

[0033] Figure 4 The operating unit 14 is shown after two maneuvering movements. The first maneuver is a rotational movement about the axis of rotation of the operating element 26. The first maneuver is achieved by means of a force influence that is translated relative to the axis of rotation of the operating unit 14, and this force influence is at least substantially parallel to the longitudinal axis 68 of the housing unit 44. A further housing recess 48 receiving the operating element 26 is limited by a groove unit 114. The groove unit 114 is configured as a stop for the operating element 26 at the end of the first maneuver. If the operating element 26 is at the end of the first maneuver, a second maneuver can be performed. The second maneuver is achieved by means of a force influence that is radially directed relative to the axis of rotation of the operating unit 14, and this force influence is at least substantially axially directed towards the operating element 26.

[0034] Figure 5 Shown in sectional view Figure 4 The safety operating device 10 according to the invention is shown in the indicated state. At the end of the second operating movement, the operating element 26 moves axially by means of the fixing element 60 in the elongated recess 62. The spring element 30 is compressed at the end of the second operating movement. The operating element 66 of the operating unit 14 contacts another signal element 24. The other signal element 24 is configured to transmit a contact signal to the control or adjustment unit 18.

[0035] Figure 6A schematic functional block diagram of a machine tool 12 having a safety operation device 10 according to the invention is shown. The machine tool 12 has an energy storage unit 72. The energy storage unit 72 is configured as a battery. The energy storage unit 72 is operatively connected to a pre-activation unit 16. Furthermore, the energy storage unit 72 supplies current to a supply unit 74. The energy storage unit 72 supplies current to a charging unit 76. The supply unit 74 supplies current to a control or regulation unit 18. The charging unit 76 controls the current supply to the control or regulation unit 18. The charging unit 76 is operatively connected to a charging regulation device 110. The charging regulation device 110 is configured for the charging process via USB-C PD. The supply unit 74 supplies current to a display unit 70. The pre-activation unit 16 triggers a pre-activation signal during operation, which is transmitted to the supply unit 74. The pre-activation signal is configured for waking up a function 80 and / or locking a function 82. The supply unit 74 transmits the pre-activation signal to the display unit 70. Furthermore, it transmits the pre-activation signal to the control or regulation unit 18. The operation unit 14 triggers an operation signal during operation, which is also transmitted to the control or regulation unit 18. The operation signal is configured to turn function 84 on or off. If a pre-activation signal and an operation signal are input to the control or regulation unit 18, the control or regulation unit 18 turns on / controls the driver unit 86. The driver unit 86 is operatively connected to the power stage unit 88.

[0036] Power stage unit 88 is configured for battery disconnect device 106. Power stage unit 88 includes at least one transistor element 90, 92. Transistor element 90 has gate circuit 94. Another transistor element 92 has another gate circuit 96. Gate circuit 94 is controlled by operation unit 14. Gate circuit 94 is in a closed state when machine tool 12 is pre-activated by pre-activation unit 16 and operation unit 14 triggers an operation signal at the end of the second actuation movement of operation element 26. When gate circuit 94 is in an open state, the energy supply from energy storage unit 72 to drive unit 40 of machine tool 12 is interrupted at the positive terminal. The other gate circuit 96 is in a closed state when a pre-activation signal is input to control or regulation unit 18, when an operation signal is input to control or regulation unit 18, when control or regulation unit 18 transmits the operation signal to driver unit 86, and when an operation signal is input to driver unit 86. When gate circuit 96 is in the open state, the energy supply from energy storage unit 72 to drive unit 40 of machine tool 12 is interrupted at the negative terminal.

[0037] The safety operating device 10 has at least one sensor unit 98 configured to detect characteristic parameters 100 of the machine tool 12 and transmit them to the control or regulation unit 18. Characteristic parameters 100 may describe voltage, current intensity, temperature, etc. The control or regulation unit 18 particularly has software functions 102, such as maintaining a constant soft start, braking function, speed limit, speed range, and / or including data reading or the like. The machine tool 12 has a DC voltage intermediate circuit 104 configured to electrically couple multiple power grids at intermediate current or voltage levels via an inverter, acting as an energy storage device.

[0038] Figure 7 A detailed view of the operating element 26 with a bent edge 112 is shown. The bent edge 112 is arranged on the side of the operating element 26 facing the guide unit 32. The bent edge 112 forms a blocking edge 118 on the operating element 26. The bent edge 112 forms a guide edge 120 on the operating element 26. The operating element 26 may have an additional recess 116.

[0039] Figure 8 A portion of the safety operating device 10 is shown schematically. An operating element 26 is arranged in a slide unit 114. A guide unit 32 is arranged on the slide unit 114. The guide unit 32 has a curved portion. The operating element 26 moves along the guide unit 32 during a first operating movement. The operating element 26 moves along the guide unit 32 on a guide edge 120 during the first operating movement. A blocking unit 34 is at least partially arranged on the guide unit 32. The blocking unit 34 is arranged at the interface between the initial position of the operating element 26 and the final position of the first operating movement on the guide unit 32. The guide unit 32 has at least one guide surface 108. During the first operating movement, the operating element 26 moves parallel to the guide surface 108 of the guide unit 32 on the guide edge 120 of the curved portion 112. The blocking unit 34 is located on the guide surface 108 and is configured to block the movement of the operating element 26 along the guide surface 108 with a force effect that is radial to the axis of rotation 28, which is greater than the spring force of the spring element 30 of the operating unit 14.

[0040] The first actuating movement of the operating unit 14 is achieved, in particular, by the force acting on the operating element 26 of the operating unit 14, which is at least substantially translationally directed relative to the axis of rotation of the operating unit 14. The first actuating movement of the operating element 26 is carried out by the force acting on the operating element 26, which is purely translationally directed relative to the axis of rotation of the operating element 26, along the blocking edge 118 across the blocking unit 34. During the first actuating movement, the operating element 26 is pushed against the blocking unit 34 on the blocking edge 118, as... Figure 9As shown. The bent edge 112, under the influence of a force radially directed toward the rotation axis of the operating element 26, abuts against the blocking unit 34 during the first operating movement of the operating element 26.

[0041] Here, Figure 10 The diagram illustrates the operating element 26 in a blocking position during the introduction of a first actuation movement from its initial position, influenced by a force acting on the operating element 26 radially toward the rotation axis 28 of the operating element 26. During the first actuation movement, the operating element 26 translates under the influence of the force acting on the operating element 26 of the operating unit 14 radially toward the rotation axis 28 of the operating element 26, thereby placing the blocking edge 118 on the guide surface 108. The blocking edge 118 forms a form-locking connection with the blocking unit 34. The first actuation movement along the guide surface 108 by the blocking edge 118 of the bent portion 112 is blocked by the blocking unit 34. The bent portion 112 at least substantially coincides with the guide surface 108. The blocking edge 118 at least substantially coincides with the guide surface 108.

Claims

1. A safety operating device (10) for operating a machine tool (12), the safety operating device having at least one operating unit (14) for manipulating the machine tool (12), the operating unit being configured to move in a sequence of at least two mutually distinct manipulatory movements, characterized in that, A pre-activation unit (16) is provided, which is configured to release the activation of the machine tool (12) by means of manipulation by the operation unit (14), wherein the operation unit (14) has an operation element (26) which is rotatably supported about a rotation axis (28) and is radially translatably supported about the rotation axis (28), wherein a first manipulation movement of the operation unit (14) includes a movement of at least a partial rotation of the operation element (26) about the rotation axis (28), and a second manipulation movement of the operation unit (14) includes a translational movement of the operation element (26) radially about the rotation axis (28), wherein the second manipulation movement is configured in the pre-activation state to activate the machine tool (12).

2. The safety operation device (10) according to claim 1, characterized in that, A control or adjustment unit (18) is provided, the control or adjustment unit having at least one signal element (20), wherein the pre-activation unit (16) has at least one pre-activation element (22), the pre-activation element being configured to act in connection with the signal element (20) for introducing a pre-activation state.

3. The safety operation device (10) according to claim 1 or 2, characterized in that, A control or adjustment unit (18) is provided, the control or adjustment unit having at least one additional signal element (24), wherein the operating element is configured to act in connection with the additional signal element (24) at the end of the last maneuver of the operating unit (14).

4. The safety operation device (10) according to claim 1 or 2, characterized in that, The operating unit (14) has a spring element (30) configured to bring the operating unit (14) into an initial position.

5. The safety operation device (10) according to claim 1 or 2, characterized in that, A guide unit (32) is provided, which is configured to prevent a second manipulation movement of the operation unit (14) during a first manipulation movement and to enable the second manipulation movement of the operation unit (14) to be realized at the end of the first manipulation movement of the operation unit (14).

6. The safety operation device (10) according to claim 5, characterized in that, At least one blocking unit (34) is provided, which is at least partially arranged on the guide unit (32), and the blocking unit is configured to block the feed to the final position of the first maneuver during the first maneuver, under the influence of a force acting on the operating unit (14) radially to the rotation axis (28) of the operating unit (14).

7. The safety operation device (10) according to claim 1 or 2, characterized in that, The control or adjustment unit (18) is configured to end the pre-activation state of the pre-activation unit (16) after a defined time period when the operation unit (14) is inactive and to prevent the machine tool (12) from being activated by the operation unit (14).

8. The safety operation device (10) according to claim 1, characterized in that, The machine tool (12) is a handheld machine tool.

9. The safety operation device (10) according to claim 1, characterized in that, The operating unit (14) is an emergency braking unit.

10. A machine tool system (36) having at least one machine tool (12), having machine tool accessories (38), and having a safety operating device (10) according to any one of claims 1 to 9.

11. The machine tool system (36) according to claim 10, characterized in that, The machine tool (12) has a drive unit (40), wherein the operation unit (14) is configured to activate the drive unit (40) according to the switching state of the pre-activation unit (16) during operation.

12. The machine tool system (36) according to claim 10, characterized in that, The machine tool (12) is an angle grinder.

13. The machine tool system (36) according to claim 10, characterized in that, The machine tool accessory (38) is a grinding wheel.

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