Abstract
A safety operating device for operating a machine tool, in particular a hand-held machine tool, is disclosed. The device includes at least one operating unit, in particular a dead-man unit, for actuating the machine tool. The operating unit is designed to be moved in a sequence of at least two mutually different actuating movements. The device further includes a pre-activation unit that is designed to enable activation of the machine tool by way of an actuation by the operating unit.
Claims
1. A safety operating device for operating a machine tool, comprising: at least one operating unit configured to actuate the machine tool, said at least one operating unit being designed to be moved in a sequence of at least two different actuating movements; and a pre-activation unit designed to enable activation of the machine tool by way of an actuation by the at least one operating unit.
2. A safety operating device according to claim 1, further comprising a control unit which has at least one signal element, wherein the pre-activation unit has at least one pre-activation element which is configured to initiate a pre-activation state for an effective connection to the signal element.
3. A safety operating device according to claim 2, further comprising a control unit which has at least one further signal element, wherein the at least one operating unit has an operating element configured for an effective connection to the further signal element at the end of a last actuating movement of the at least one operating unit.
4. A safety operating device according to claim 1, wherein: a first actuating movement of the at least one operating unit comprises an at least partially rotational movement about an axis of rotation of an operating element, and a second actuating movement of the at least one operating unit comprises a translational movement radially with respect to the axis of rotation, the second actuating movement being effective, in a pre-activation state, to activate the machine tool.
5. A safety operating device according to claim 1, wherein the at least one operating unit has a spring element configured to bring the at least one operating unit into an initial position.
6. A safety operating device according to claim 1, further comprising a guide unit configured to (i) prevent a second actuating movement of the at least one operating unit during a first actuating movement of the at least one operating unit, and (ii) enable the second actuating movement of the at least one operating unit at the end of a first actuating movement of the at least one operating unit.
7. A safety operating device according to claim 6, further comprising at least one blocking unit arranged at least partially on the guide unit, said blocking unit being configured to, during the first actuating movement, block an advance into an end position of the first actuating movement in the event of a force influence on the at least one operating unit which is directed radially with respect to an axis of rotation of the at least one operating unit.
8. A safety operating device according to claim 1, further comprising a control unit configured to (i) end a pre-activation state of the pre-activation unit after a defined period of time when the at least one operating unit is inactive, and (ii) prevent activation of the machine tool by the at least one operating unit.
9. A machine tool system, comprising: at least one machine tool including a machine tool accessory, and a safety operating device according to claim 1.
10. The machine tool system according to claim 9, wherein: the machine tool has a drive unit, and the at least one operating unit is configured to, upon actuation, activate the drive unit in dependence on a switching state of the pre-activation unit.
11. A safety operating device according to claim 1, wherein the machine tool is a hand-held machine tool.
12. A safety operating device according to claim 11, wherein the at least one operating unit is at least one dead man unit.
13. A machine tool system according to claim 9, wherein: the at least one machine tool is an angle grinder, and the machine tool accessory is a grinding wheel.
Description
DRAWINGS
[0016] Further advantages result from the following description of the drawings. An embodiment of the invention is illustrated in the drawings. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form meaningful further combinations.
[0017] In the Drawings:
[0018] FIG. 1 is a schematic view of a machine tool comprising a safety operating device according to the invention,
[0019] FIG. 2 is a schematic view of the safety operating device according to the invention, in a plan view of a housing of the machine tool in a deactivation state,
[0020] FIG. 3 is a schematic sectional view of the safety operating device according to the invention in a deactivation state,
[0021] FIG. 4 is a schematic view of the safety operating device according to the invention, in a plan view of a housing of the machine tool at the end of a second actuating movement,
[0022] FIG. 5 is a schematic sectional view of the safety operating device according to the invention at the end of a second actuating movement,
[0023] FIG. 6 is a schematic functional block diagram of a machine tool comprising the safety operating device according to the invention,
[0024] FIG. 7 is a detailed view of an operating element of the safety operating device according to the invention,
[0025] FIG. 8 is a schematic view of the operating element of the safety operating device according to the invention in an initial position,
[0026] FIG. 9 is a schematic view of the operating element at the end of a first actuating movement, and
[0027] FIG. 10 is a schematic view of the operating element in a blocking state in the case of a force influence directed radially with respect to an axis of rotation of the operating unit.
DESCRIPTION OF THE EMBODIMENT
[0028] FIG. 1 is a schematic view of a machine tool system 36 comprising a machine tool 12 and a machine tool accessory 38, and comprising a safety operating device 10 according to the invention. The machine tool 12 is in particular designed as an angle grinder. The machine tool system 36 is provided for accommodating the machine tool accessory 38. The machine tool accessory 38 is designed as a grinding wheel. The machine tool accessory 38 can also be designed as a cutting disk or the like. The machine tool system 36 has a spindle lock 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 designed as a dead-man device. The operating unit 14 is designed as a two-way dead-man 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 provided to activate the machine tool 12 by means of at least two actuating movements of the operating element 26 by an operator, depending on a pre-activation state of the pre-activation unit 16. The safety operating device 10 has a display unit 70.
[0029] FIG. 2 shows the pre-activation element 22 and the operating element 26 from an operator view in an initial position. The machine tool 12 is in a deactivation state. The display unit 70 has a luminous element 78. The luminous element 78 is designed as an LED. The luminous element 78 is provided to indicate the status of the pre-activation unit 16, and/or an error warning, and/or a state of charge of the machine tool 12 to an operator. The display unit 70 is inactive in a deactivation state. The pre-activation element 22 is arranged at least in part on the housing unit 44. The operating element 26 is arranged at least in part on the housing unit 44. The housing unit 44 has at least one housing recess 46, 48. The safety operating device 10 is arranged at least in part so as to be accessible to an operator through the at least one housing recess 46, 48 on the housing unit 44. The safety operating device 10 has a link unit 114. The link unit 114 is arranged on the further housing recess 48. The link unit 114 delimits the further housing recess 48. The pre-activation element 22 is arranged in the housing recess 46 of the housing unit 44. The housing unit 44 delimits the housing recess 46. The housing recess 46 has a circular contour. The housing unit 44 is provided, by means of the housing recess 46, to enable an axial actuating movement of the pre-activation element 22. The housing unit 44 has a further housing recess 48. The operating element 26 is arranged at least in part in the further housing recess 48. The link unit 114 delimits the further housing recess 48. The further housing recess 48 has a slot-like contour. The link unit 114 is provided, by means of the further housing recess 48, to enable a rotational actuating movement about an axis of rotation of the operating unit 14. The safety operating device 10 has a guide unit 32. The guide unit 32 is provided to enable a first actuating movement of the operating element 26. The guide unit 32 is provided to prevent a second actuating movement of the operating element 26 in an initial position of the operating element 26. The guide unit 32 is arranged on the link unit 114. The guide unit 32 is arranged within the further housing recess 48 on the link unit 114. The guide unit 32 is arranged on a side of the further housing recess 48 facing the pre-activation unit 16, in a U-shape on the housing unit 44. The side of the further housing recess 48 facing away from the pre-activation unit 16 is free of the guide unit 32. The safety operating device 10 has a blocking unit 34. The blocking unit 34 is designed as a lifting extension. The blocking unit 34 is arranged at least in part on the guide unit 32. The blocking unit 34 is provided to block a first actuating movement of the operating element 26 in the event of a force influence on the operating element 26 which is directed radially with respect to the axis of rotation of the operating unit 14.
[0030] FIG. 3 is a sectional view in a longitudinal section of the safety operating device 10 shown in FIG. 2. The pre-activation unit 16 has a restoring element 50 which is arranged on the pre-activation element 22. The restoring element 50 is provided to return the pre-activation element 22 to an initial position after actuation. The safety operating device 10 has a control unit 18. The control unit 18 has at least one signal element 20, 24. One signal element 20 is provided for an effective connection to the pre-activation unit 16. A further signal element 24 is provided for an effective connection to the operating unit 14. The signal element 20 is arranged in close proximity to the pre-activation unit 16 within the safety operating device 10. The further signal element 24 is arranged in close proximity to the operating unit 14 within the safety operating device 10. The signal element 20 and the further signal element 24 are designed as microswitches. The signal element 20 is provided for forwarding an actuation of the pre-activation unit 16, as an electrical signal, to the control unit 18. The further signal element 24 is provided for forwarding an actuation of the operating unit 14 to the control unit 18 after contact has been made with the further signal element 24.
[0031] The operating unit 14 has a receiving element 52. The receiving element 52 is provided to fasten the operating element 26 movably relative to the housing unit 44 of the machine tool 12. The receiving element 52 has at least two receiving surfaces 54, 56, which are at least substantially transverse to one another. A receiving surface 54 lying at least substantially in parallel with a longitudinal axis of the operating element 26 is provided to fasten the operating unit 14 to the housing unit 44. A further receiving surface 56, which is at least substantially transverse to a longitudinal axis of the operating element 26, has a recess 58. The operating element 26 is arranged at least in part within the recess 58. The operating unit 14 has a spring element 30, which is provided to return 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 respect to the spring element 30. The spring element 30 is arranged on the further receiving surface 56 lying at least substantially transversely to a longitudinal axis of the operating element 26.
[0032] The operating element 14 has a fastening element 60. The fastening element 60 is designed as a pin. The further receiving surface 56 is provided for at least partially receiving the fastening element 60. The operating element 26 has a slot recess 62. The fastening element 60 engages in the slot recess 62 of the operating element 26. The operating element 26 is provided, by means of the slot recess 62, for an axial actuating movement. In the axial actuating movement, the spring element 30 is compressed and a restoring force arises. By means of the restoring force of the spring element 30, the operating element can be returned to an initial position, which is shown in FIG. 3. The operating unit 14 has a cover element 64 which is provided to cover the further housing recess 48 of the housing unit 44 in which the operating element 26 is arranged. The cover element 64 has a curvature. The cover element 64 is arranged on the operating element 26. The operating unit 14 has an actuating element 66. The actuating element 66 is arranged on the operating element 26. The actuating element 66 is arranged on the operating element 26, below a side of the cover element 64 facing the axis of rotation 28. The actuating element 66 is provided to actuate the further signal element 24 of the control unit 18 during an axial actuating movement of the operating element 26.
[0033] FIG. 4 shows the operating unit 14 after two completed actuating movements. A first actuating movement is a rotational movement about the axis of rotation of the operating element 26. The first actuating movement takes place by means of a force influence which is directed translationally with respect to the axis of rotation of the operating unit 14 and is directed at least substantially in parallel with a housing longitudinal axis 68 of the housing unit 44. The further housing recess 48, which receives the operating element 26, is delimited by the link unit 114. The link unit 114 is provided to form a stop for the operating element 26 at the end of the first actuating movement. If the operating element 26 is at the end of the first actuating movement, a second actuating movement can take place. The second actuating movement takes place by means of a force influence which is directed radially with respect to the axis of rotation of the operating unit 14 and which is at least substantially axial relative to the operating element 26.
[0034] FIG. 5 is a sectional view of the safety operating device 10 according to the invention in the illustrated state of FIG. 4. At the end of the second actuating movement, the operating element 26 is axially displaced in the slot recess 62 by means of the fastening element 60. The spring element 30 is compressed at the end of the second actuating movement. The actuating element 66 of the operating unit 14 is in contact with the further signal element 24. The further signal element 24 is provided for forwarding the contact signal to the control unit 18.
[0035] FIG. 6 is a schematic functional block diagram of the machine tool 12 comprising the safety operating device 10 according to the invention. The machine tool 12 has an energy storage unit 72. The energy storage unit 72 is designed as a rechargeable battery. The energy storage unit 72 is effectively connected to the pre-activation unit 16. Furthermore, the energy storage unit 72 supplies power to a supply unit 74. The energy storage unit 72 supplies power to a charging unit 76. The supply unit 74 supplies power to the control unit 18. The charging unit 76 controls the power supply to the control unit 18. The charging unit 76 is effectively connected to a charge controller 110. The charge controller 110 is provided for a charging process by means of USB-C PD. The supply unit 74 supplies power to the display unit 70. Upon actuation, the pre-activation unit 16 triggers a pre-activation signal which is forwarded to the supply unit 74. The pre-activation signal is provided for a wake-up function 80 and/or a blocking function 82. The supply unit 74 forwards a pre-activation signal to the display unit 70. The pre-activation signal is further forwarded to the control unit 18. Upon actuation, the operating unit 14 triggers an operating signal which is also forwarded to the control unit 18. The operating signal is provided for an on or off function 84. If a pre-activation signal and an operating signal have been received in the control unit 18, the control unit 18 initiates a driver unit 86. The driver unit 86 is effectively connected to a power stage unit 88.
[0036] The power stage unit 88 is provided for a battery separation 106. The power stage unit 88 has at least one transistor element 90, 92. The one transistor element 90 has a gate 94. The further transistor element 92 has a further gate 96. The one gate 94 is controlled by the operating unit 14. The gate 94 is in a closed state when the machine tool 12 is pre-activated by means of the pre-activation unit 16, and the operating unit 14 triggers an operating signal at the end of the second actuating movement of the operating element 26. If the gate 94 is in an open state, the energy supply from the energy storage unit 72 to the drive unit 40 of the machine tool 12 is interrupted at a positive pole. The further gate 96 is in a closed state when a pre-activation signal is received in the control unit 18, when an operating signal is received in the control unit 18, when the control unit 18 forwards the operating signal to the driver unit 86, and when the operating signal is received in the driver unit 86. If the gate 96 is in an open state, the energy supply from the energy storage unit 72 to the drive unit 40 of the machine tool 12 is interrupted at a negative pole.
[0037] The safety operating device 10 has at least one sensor unit 98 which is provided to detect characteristic variables 100 of the machine tool 12 and to forward them to the control unit 18. The characteristic variables 100 can describe voltage, current intensity, temperature or the like. The control unit 18 has, in particular, software functions 102 which, for example, keep a soft start, a braking function, a speed limit and a speed range constant, and/or can include a data readout or the like. The machine tool 12 has a direct voltage intermediate circuit 104, which is provided to electrically couple a plurality of electrical networks, as an energy store, on an interposed current or voltage level via converters.
[0038] FIG. 7 is a detailed view of the operating element 26 comprising a chamfer 112. The chamfer 112 is arranged on a side of the operating element 26 facing the guide unit 32. The chamfer 112 forms a blocking edge 118 on the operating element 26. The chamfer 112 forms a guide edge 120 on the operating element 26. The operating element 26 can have a further recess 116.
[0039] FIG. 8 is a schematic view of a detail of the safety operating device 10. The operating element 26 is arranged in the link unit 114. The guide unit 32 is arranged on the link unit 114. The guide unit 32 has a curvature. The operating element 26 moves along the guide unit 32 during a first actuating movement. The operating element 26 is moved along the guide unit 32 at the guide edge 120 during a first actuating movement. The blocking unit 34 is arranged at least in part on the guide unit 32. The blocking unit 34 is arranged on the guide unit 32 at an interface of the initial position of the operating element 26 and an end position of the first actuating movement. The guide unit 32 has at least one guide surface 108. During the first actuating movement, the operating element 26 is moved on the guide edge 120 of the chamfer 112, in parallel with the guide surface 108 of the guide unit 32. The blocking unit 34 rests on the guide surface 108 and is provided to block a movement of the operating element 26 along the one guide surface 108 with force influence which is directed radially with respect to the axis of rotation 28 and is greater than a spring force of the spring element 30 of the operating unit 14.
[0040] The first actuating movement of the operating unit 14 takes place in particular by a force influence on the operating element 26 of the operating unit 14 which is directed at least substantially translationally with respect to the axis of rotation of the operating unit 14. The first actuating movement of the operating element 26 with a force influence on the operating element 26 directed purely translationally with respect to the axis of rotation of the operating element 26 takes place along the blocking edge 118, via the blocking unit 34. During a first actuating movement, the operating element 26 is pushed over the blocking unit 34 on the blocking edge 118, as shown in FIG. 9. The chamfer 112 blocks against the blocking unit 34 during the first actuating movement of the operating element 26 when a force influence is directly radially with respect to the axis of rotation of the operating element 26.
[0041] FIG. 10 shows the operating element 26 in a blocking position due to a force influence on the operating element 26 which is directed radially with respect to the axis of rotation 28 of the operating element 26, during an initiation of the first actuating movement out of the initial position. In the case of a force influence on the operating element 26 of the operating unit 14 which is directed radially with respect to the axis of rotation 28 of the operating element 26, during a first actuating movement the operating element 26 is displaced translationally, so that the blocking edge 118 rests on the guide surface 108. The blocking edge 118 enters a form-fitting connection with the blocking unit 34. The first actuating movement with the blocking edge 118 of the chamfer 112 along the one guide surface 108 is blocked by the blocking unit 34. The chamfer 112 is at least substantially congruent with the guide surface 108. The blocking edge 118 is at least substantially congruent with the guide surface 108.
