Hand-held power tool device

Abstract

A hand-held power tool device, in particular a hammer drill and/or chisel hammer device, includes at least one operating element and at least one locking unit. The at least one locking unit includes at least one locking element and at least one controllable actuator element. The at least one locking element can be moved from at least one storage position into at least one locking position, and vice versa, and locks the operating element in at least one operating state in the locking position. The at least one controllable actuator element influences motion of the locking element.

Claims

1. A hand-held power tool device, comprising: at least one operator-control element; and at least one locking unit including: at least one locking element configured to be moved from at least one storage position into at least one locking position, and from the at least one locking position into the at least one storage position; and at least one actuator element configured to be activated and to move the at least one locking element from the at least one storage position to the at least one locking position, wherein, the at least one actuator element is configured to be activated electrically, and in the at least one locking position, in at least one operating state, the at least one locking element locks the at least one operator-control element.

2. The hand-held power tool device as claimed in claim 1, wherein: the at least one operator-control element defines at least one holding recess; and the at least one locking element engages the at least one holding recess in the at least one operating state.

3. The hand-held power tool device as claimed in claim 1, wherein: the at least one actuator element includes at least one electromagnet; and the at least one locking element is configured to be at least partly magnetic.

4. The hand-held power tool device as claimed in claim 1, wherein the at least one actuator element and the at least one locking element are part of a stroke magnet.

5. The hand-held power tool device as claimed in claim 1, wherein the at least one actuator element is configured, at least partly, to be variable in shape.

6. The hand-held power tool device as claimed in claim 1, further comprising: at least one further operator-control element including at least three operator-control positions.

7. The hand-held power tool device as claimed in claim 1, further comprising: at least one locking switch which, upon being actuated, initiates a locking.

8. The hand-held power tool device as claimed in claim 7, further comprising: a control unit configured to take account of at least one actuation and/or operator-control position of the at least one locking switch so as to activate the at least one actuator element.

9. The hand-held power tool device as claimed in claim 1, wherein the hand-held power tool device is a hammer drill and/or chipping hammer device.

10. A hand-held power tool device, comprising: at least one operator-control element; and at least one locking unit including: at least one locking element configured to be at least partly magnetic and configured to be moved with respect to the at least one operator-control element from at least one storage position into at least one locking position, and from the at least one locking position into the at least one storage position; and at least one actuator element including at least one electromagnet and configured to be activated and to influence the movement of the at least one locking element, wherein, in the at least one locking position, in at least one operating state, the at least one locking element locks the at least one operator-control element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages are disclosed by the following description of the drawing. Six exemplary embodiments of the disclosure is represented in the drawing. The drawing, the description and the claims contain numerous features in combination. Persons skilled in the art will also expediently consider the features individually and combine them to create appropriate further combinations.

(2) There are shown:

(3) FIG. 1 a hand-held power tool, realized as a combination hammer, having a hand-held power tool device, in a schematic representation,

(4) FIG. 2 an operator-control element and a locking unit of the hand-held power tool device in a first operating state, in an enlarged representation,

(5) FIG. 3 the operator-control element and the locking unit in a second operating state, in an enlarged representation,

(6) FIG. 4 an operator-control element and a locking unit of a further hand-held power tool device in a first operating state, in an enlarged representation,

(7) FIG. 5 the operator-control element and the locking unit from FIG. 4 in a second operating state, in an enlarged representation,

(8) FIG. 6 an operator-control element and a locking unit of a further hand-held power tool device in a first operating state, in an enlarged representation,

(9) FIG. 7 the operator-control element and the locking unit from FIG. 6 in a second operating state, in an enlarged representation,

(10) FIG. 8 an operator-control element and a locking unit of a further hand-held power tool device in a first operating state, in an enlarged representation,

(11) FIG. 9 the operator-control element and the locking unit from FIG. 8 in a second operating state, in an enlarged representation,

(12) FIG. 10 an operator-control element and a locking unit of a further hand-held power tool device in an operating state, in an enlarged representation,

(13) FIG. 11 an operator-control element and a locking unit of a further hand-held power tool device in a first operating state, in an enlarged representation, and

(14) FIG. 12 the operator-control element and the locking unit from FIG. 11 in a second operating state, in an enlarged representation.

DETAILED DESCRIPTION

(15) FIG. 1 shows a hand-held power tool 32a in a schematic representation. The hand-held power tool 32a is realized as a combination hammer, in the present case in particular as a hammer drill and/or chipping hammer. The hand-held power tool 32a is realized such that it can be motor-operated. In the present case, the hand-held power tool 32a is realized as an electric hand-held power tool. The hand-held power tool 32a in this case is cable-connected and thus, in particular, is operated by mains electric power. Alternatively, it is conceivable to realize a hand-held power tool as any other hand-held power tool such as, for example, as a hammer drill, as a chipping hammer, as an impact power drill, as a demolition hammer and/or as a power drill. It is additionally conceivable to realize a hand-held power tool without cable connection and thus, in particular, operated by battery and/or accumulator.

(16) The hand-held power tool 32a has a hand-held power tool device. The hand-held power tool device comprises a machine housing 34a. The machine housing 34a is realized as an external housing. At least a majority of the components required for operation of the hand-held power tool 32a are arranged inside the machine housing 34a.

(17) The hand-held power tool device additionally has a work unit 36a. The work unit 36a is arranged in a front region of the machine housing 34a. The work unit 36a comprises at least one work-tool receiver, which is designed to receive an insert tool. Alternatively, it is conceivable for a work unit to correspond directly to a work tool.

(18) For the purpose of driving and/or operating the work unit 36a, the hand-held power tool device comprises a drive unit 38a. The drive unit 38a is arranged inside the machine housing 34a. The drive unit 38a comprises a motor, in the present case in particular an electric motor. The drive unit 38a has at least one operative connection to the work unit 36a. For this purpose, the drive unit 38a may comprise further units such as, for example, at least one transmission. Alternatively, it is conceivable to realize a drive unit as an internal combustion engine and/or hybrid motor.

(19) For the purpose of energy supply, the hand-held power tool device additionally comprises an energy supply unit 40a. The energy supply unit 40a in the present case is realized as a mains electric power connection. The energy supply unit 40a has an operative connection to the drive unit 38a. The energy supply unit 40a is designed, at least, to supply the drive unit 38a with energy, in at least one operating state. Alternatively, it is also conceivable to realize an energy supply unit as a petrol tank, as a fuel cell, as a battery and/or advantageously as an accumulator, in particular as an 18 V and/or 36 V accumulator. In particular, in this case the energy supply unit may be fixedly built into a machine housing and/or advantageously realized so as to be changeable and/or replaceable.

(20) Furthermore, the hand-held power tool device comprises further units for operation of the hand-held power tool 32a, such as, for example, an electronics unit (not represented) and/or a, in particular electrical, control unit 30a. In the present case, the energy supply unit 40a is designed to supply energy to the electronics unit and the control unit 30a.

(21) The hand-held power tool device additionally has a main handle 33a. The main handle 33a is realized as a rear handle. The main handle 33a is realized on a side of the machine housing 34a that faces away from the front region. The main handle 33a is designed, at least substantially, for holding and/or guiding the hand-held power tool 32a.

(22) The hand-held power tool device additionally has a first operator-control element 10a. The first operator-control element 10a is realized as an ON switch 24a. The first operator-control element 10a is realized as an actuation element. The first operator-control element 10a is realized as a pawl. The first operator-control element 10a in this case is mounted so as to be pivotable about a pivot axis 48a (see also FIGS. 2 and 3). Furthermore, the first operator-control element 10a is arranged in the proximity of the main handle 33a. The first operator-control element 10a is arranged on an inner side of the main handle 33a. The first operator-control element 10a is arranged, at least partly, inside the machine housing 34a. In the present case, the first operator-control element 10a has at least one, in particular at least substantially bar-type, guide element 50a, which is run at least partly inside the machine housing 34a. In addition, the first operator-control element 10a is realized as a dead man's switch. The first operator-control element 10a in this case is spring-mounted. In the present case, the hand-held power tool device comprises a resetting element 44a, in particular realized as a spring, which is designed, at least upon an actuation of the first operator-control element 10a, to exert a resetting force upon the first operator-control element 10e. The first operator-control element 10a also has an operative connection to the control unit 30a. The first operator-control element 10a is designed to be actuated by an operator for the purpose of operating the hand-held power tool 32a. In this case the first operator-control element 10a can be moved at least from a first operator-control position, in the present case in particular an OFF position, into at least one second operator-control position, in the present case in particular an ON position. The first operator-control element 10a is designed to activate the drive unit 36a. The first operator-control element 10a is designed, in dependence on an actuation, to directly activate the drive unit 38a and/or to supply the drive unit 38a with energy, in particular by means of the energy supply unit 40a. Alternatively, however, it is also conceivable to mount a first operator-control element in any other manner, such as, for example, so as to be linearly movable, and/or to dispense with a realization as a dead man's switch.

(23) Furthermore, the hand-held power tool device has a second operator-control element 11a. The second operator-control element 11a is realized as a locking switch 26a. The locking switch 26a is realized as an actuation element. The locking switch 26a is realized as a, in particular electrical, pushbutton. The locking switch 26a is arranged in the proximity of the main handle 33a.

(24) In the present case, the locking switch 26a is arranged on a top side of the main handle 33a. The locking switch 26a has an operative connection to the control unit 30a. The locking switch 26a in this case is designed to activate the control unit 30a. The locking switch 26a additionally serves to initiate a locking that can be triggered, in particular selectively, by the operator. The locking switch 26a is thus designed, in the case of a required locking, in the present case in particular of the first operator-control element 10a and/or of the ON switch 24a, to be actuated by the operator. Alternatively, however, it is also conceivable to dispense with a second operator-control element and/or to arrange a second operator-control element at different position on a machine housing. In this case, a locking operation can be effected at least substantially automatically, for example in dependence on an operating mode and/or a rotational speed of the work unit. It is also conceivable to realize a second operator-control element and/or a locking switch as a slide switch and/or as a touch-sensitive touch element.

(25) Furthermore, the hand-held power tool device has a changeover unit 42a. The changeover unit 42a has an operative connection to the control unit 30a. The changeover unit 42a in this case is designed to activate the control unit 30a. The changeover unit 42a is designed to change an operating mode of the hand-held power tool 32a. In the present case, the changeover unit 42a serves to change over between a drilling mode and a chipping mode. For this purpose, the changeover unit 42a in the present case has a third operator-control element, which is designed as a changeover switch 28a. The changeover switch 28a is realized as an actuation element. The changeover switch 28a is realized as a rotary switch. The changeover switch 28a is arranged in a lateral region of the machine housing 34a. The changeover switch 28a is used by the operator to select the operating mode. The changeover switch 28a is designed to be actuated by the operator for the purpose of selecting the operating mode. Alternatively, further operating modes, and/or operating modes other than a drilling mode and a chipping mode, are conceivable, such as, for example, a combined drilling and chipping mode and/or a mode with a defined rotational speed, the changeover unit being used to change between the operating modes. Moreover, it is also conceivable to arrange a third operator-control element and/or a changeover switch at another position on a machine housing, and/or to dispense entirely with a third operator-control element and/or a changeover switch. In this case, a changeover unit could automatically select a suitable operating mode, for example in dependence on an insert tool used and/or on a set and/or settable rotational speed. It is also conceivable to realize a third operator-control element and/or a changeover switch as a slide switch and/or as a tough-sensitive touch element. Further, it is conceivable to realize an ON switch, a locking switch and/or a changeover switch as a single piece.

(26) In the case of hand-held power tool of the stated type, it is frequently advantageous to lock at least one of the operator-control elements 10a, 11a, in particular at least the ON switch 24a, at least temporarily, in the second operator-control position, in particular the ON position, for example in the case of more prolonged chipping work, thereby advantageously enabling the operator to be relieved and at the same time to receive a haptic feedback concerning the locking operation. For this purpose, the hand-held power tool device has a locking unit 12a. The locking unit 12a is realized so as to be at least partly mechanical. In addition, the locking unit 12a is realized so as to be at least partly electrical. The locking unit 12a has an operative connection to the control unit 30a. The locking unit 12a is designed, when in a locking operating state, in the present case in particular in at least one operating state of the chipping mode, to lock at least one of the operator-control elements 10a, 11a. In the present case, the locking unit 12a is designed, when in the locking operating state, in particular of the chipping mode, to lock the first operator-control element 10a, in particular in the second operator-control position, in particular the ON position.

(27) For this purpose, the locking unit 12a comprises a locking element 14a. The locking element 14a is arranged entirely within the machine housing 34a. The locking element 14a is of an at least substantially elongate design. In the present case, the locking element 14a is realized as a locking rod. The locking element 14a is thus realized substantially in the form of a rod. The locking element 14a is realized so as to be magnetic. Moreover, the locking element 14a is movably mounted. A direction of movement of the locking element 14a in this case is defined by a length of main extent of the locking element 14a. In the present case, the locking element 14a can be moved at least from a storage position (see FIG. 2) into a locking position (see FIG. 3) and vice versa. The locking element 14a in this case can be moved linearly and/or in a rectilinear movement from the storage position into the locking position. In addition, the locking element 14a can be moved, at least partly, in a direction that differs from the direction of movement of the first operator-control element 10a. In the locking position, the locking element 14a is designed to lock the first operator-control element 10a. For this purpose, the locking element 14a comprises a holding element 20a. The holding element 20a is realized as a bolt. For the purpose of locking the first locking element 14a in the locking position, the holding element 20a engages in a holding recess 18a of the guide element 50a of the operator-control element 10a.

(28) For the purpose of influencing a movement of the locking element 14a, the locking unit 12a comprises a further resetting element 46a, in particular realized as a spring. The further resetting element 46a is arranged entirely within the machine housing 34a. The further resetting element 46a has an operative connection to the locking element 14a. In the present case, the further resetting element 46a bears directly against a T-shaped stop of the locking element 14a. The further resetting element 46a is designed to hold the locking element 14a in the storage position and/or, in at least one operating state, move it back into the storage position.

(29) Furthermore, for the purpose of influencing a movement of the locking element 14a, the locking unit 12a comprises at least one actuator element 16a. In the present case, the locking unit 12a comprises precisely one actuator element 16a. The actuator element 16a is arranged entirely within the machine housing 34a. The actuator element 16a is arranged entirely in the proximity of the first operator-control element 10a. In addition, the actuator element 16a is realized such that it can be activated. In the present case, the actuator element 16a is realized such that it can be activated electrically. The actuator element 16a in this case has an operative connection to the control unit 30a, which is designed, in particular, to activate the actuator element 16a. Furthermore, the actuator element 16a has an operative connection to the energy supply unit 40a. In the present case, the actuator element 16a is designed to move the locking element 14a, in at least one operating state, into the locking position, for the purpose of locking the first operator-control element 10a, and in particular to hold it in the locking position until the locking is realized, in particular contrary to a resetting force of the further resetting element 46a. For this purpose, the actuator element 16a comprises at least one electromagnet 22a. In the present case, the actuator element 16a comprises precisely one electromagnet 22a, and in particular realizes the latter. The electromagnet 22a in this case is realized so as to be at least substantially cylindrical, in particular circular-cylindrical. The electromagnet 22a is realized in the shape of a hollow cylinder. The electromagnet 22a is designed to completely encompass the locking element 14a. The actuator element 16a, in particular the electromagnet 22a, and the locking element 14a in this case form a stroke magnet, the locking element 14a corresponding, in particular, to a plunger core of the stroke magnet. Alternatively, it is conceivable to use a plurality of actuator elements, a plurality of electromagnets and/or at actuator elements that are at least partly variable in shape. In connection with this it is also conceivable, in particular, to use at least one actuator element that can be activated pneumatically and/or hydraulically.

(30) In the present case, the control unit 30a is designed to connect the electromagnet 22a to the energy supply unit 40a for the purpose of locking, in particular the first operator-control element 10a, and thereby in particular to enable current to be fed to the electromagnet 22a, as a result of which the, in particular magnetic, locking element 14a moves out of the storage position, into the locking position, owing to a magnetic force of the electromagnet 22a, contrary to the resetting force of the further resetting element 46a. If the current feed is interrupted and/or blocked, the locking element 14a moves back into the storage position, owing to the resetting force of the further resetting element 46a.

(31) A locking of, and/or a current feed to, the electromagnet 22a is effected in this case in dependence on a selected operating mode, in dependence on an operator-control position of the first operator-control element 10a, and in dependence on an actuation of the locking switch 26a. In this case, for example, it is provided that locking is enabled only in the chipping mode, while locking in the drilling mode is not effected, because of safety regulations. In the present case, the control unit 30a is designed to take account of precisely three, in particular AND-linked, operating parameters, in particular the operator-control position of the first operator-control element 10a, an actuation of the locking switch 26a, and the set and/or selected operating mode, for the purpose of activating the actuator element 16a and/or the electromagnet 22a. In addition, the control unit 30a is designed to sense the operating parameters directly, whereby polling of an operating mode is effected, in particular, electrically. Particularly preferably, the control unit 30 in this case is designed to activate the actuator element 16a and/or the electromagnet 22a only if the operator-control position of the first operator-control element 10a corresponds to the second operator-control position, in particular to the ON position, the operating mode corresponds to the chipping mode, and an actuation of the locking switch 26a is effected and/or has been effected, in particular shortly beforehand.

(32) Release of the locking may be effected in this case by means of a change of the operating mode and thus, in particular, by means of an actuation of the changeover switch 28a, an actuation of the locking switch 26a and/or an actuation of the first operator-control element 10a. In all of the stated cases, the control unit 30a is designed to release the locking again.

(33) Further exemplary embodiment of the disclosure are shown in FIGS. 4 to 12. The description and the drawings that follow are limited substantially to the differences between the exemplary embodiments, and in principle reference may also be made to the drawings and/or the description of the other exemplary embodiments, in particular of FIGS. 1 to 3, in respect of components that have the same designation, in particular in respect of components denoted by the same references. To distinguish the exemplary embodiments, the letter a has been appended to the references of the exemplary embodiment in FIGS. 1 to 3. In the exemplary embodiments of FIGS. 4 to 12, the letter a has been replaced by the letters b to f.

(34) A further exemplary embodiment of the disclosure is shown in FIGS. 4 and 5. The letter b has been appended to the exemplary embodiment of FIGS. 4 and 5. The further exemplary embodiment of FIGS. 4 and 5 differs from the previous exemplary embodiment, at least substantially, by a locking unit 12b.

(35) In the present case, a locking switch 26b is realized as a pushbutton, in particular as a pushbutton that can be actuated linearly. In addition, the locking switch 26b is mechanically connected to a locking element 14b of the locking unit 12b. In the present case, the locking switch 26b is realized so as to constitute a single piece with the locking element 14b, and in particular is designed, upon being actuated, to transmit a linear movement directly to the locking element 14b. A movement of the locking element 14b from a storage position (see FIG. 4) into a locking position (see FIG. 5) is thus effected manually by means of an actuation of the locking switch 26b. In this case, an actuator element 16b of the locking unit 12b is designed to hold the locking element 14b in the locking position, at least temporarily, in particular during a locking of a first operator-control element 10b, and in particular in a chipping mode. Alternatively, however, it is also conceivable for a locking switch to be indirectly mechanically connected to a locking element, such as, for example, by means of a transmission.

(36) Furthermore, the hand-held power tool device in the present case comprises a sensing unit, in particular an additional sensing unit. The sensing unit has an operative connection to a control unit 30b. The sensing unit comprises a first sensing element 52b, in particular realized as a microswitch, for sensing an actuation and/or an operator-control position of the first operator-control element 10b. The first sensing element 52b is designed to transmit a sensed actuation and/or operator-control position of the first operator-control element 10b to the control unit 30b. The sensing unit further comprises a second sensing element 53b, in particular realized as a pressure sensing element, for sensing an actuation and/or an operator-control position of the locking switch 26b. The second sensing element 53b is designed to transmit a sensed actuation and/or operator-control position of the locking switch 26b to the control unit 30b. Alternatively, however, it is conceivable to dispense with an additional sensing unit and/or to realize at least one sensing element as any other sensing element.

(37) A further exemplary embodiment of the disclosure is shown in FIGS. 6 and 7. The letter c has been appended to the exemplary embodiment of FIGS. 6 and 7. The further exemplary embodiment of FIGS. 6 and 7 differs from the previous exemplary embodiments, at least substantially, by a locking unit 12c.

(38) In the present case, a second operator-control element 11c and/or a locking switch 26c are/is realized as a slide switch, and defines at least one further holding recess 19c. In this case a locking element 14c of the locking unit 12c, in a locking operating state, engages in a holding recess 18c of a first operator-control element 10c and in the holding recess 19c of the second operator-control element 11c. Accordingly, the locking element 14c, in the locking operating state, and in particular in a locking position, locks the first operator-control element 10c, in particular realized as an ON switch 24c, and the second operator-control element 11c, in particular realized as a locking switch 26c. Alternatively, it is also conceivable that a locking element may be designed merely to lock a second operator-control element, in particular realized as a locking switch.

(39) A further exemplary embodiment of the disclosure is shown in FIGS. 8 and 9. The letter d has been appended to the exemplary embodiment of FIGS. 8 and 9. The further exemplary embodiment of FIGS. 8 and 9 differs from the previous exemplary embodiments, at least substantially, by a first operator-control element 10d and a locking unit 12d.

(40) The first operator-control element 10d has at least three operator-control positions. In the present case, the first operator-control element 10d has a multiplicity of operator-control positions that, at least substantially, are continuously settable. One of the operator-control positions in this case corresponds to an OFF position, while the further operator-control positions correspond to differing ON positions. The first operator-control element 10d is realized as a variable-speed switch, a pressure travel regulating a rotational speed of a drive unit 38a and/or of a work unit 36a.

(41) Furthermore, in the present case the locking unit 12d is designed to lock the operator-control element 10d in a plurality of the operator-control positions realized as ON positions. For this purpose the locking unit 12d comprises a first locking element 14d. The first locking element 14d corresponds, at least substantially, to a locking element 14c of the previous exemplary embodiment. The first locking element 14d is designed to directly lock a second operator-control element 11d and/or a locking switch 26d. In addition, the first locking element 14d is designed to indirectly lock the first operator-control element 10d.

(42) Furthermore, in the present case the locking unit 12d comprises a second locking element 54d. The second locking element 54d is arranged entirely within a machine housing 34d. The second locking element 54d is realized as a locking hook. The second locking element 54d is thus realized substantially in the shape of a hook. The second locking element 54d has an operative connection to a guide element 50d of the first operator-control element 10d, which guide element 50d in the present case is realized as a cable pull. The second locking element 54d is movably mounted. A direction of movement of the second locking element 54d in this case is at least substantially parallel to a direction of movement of the second operator-control element 11d and/or of the locking switch 26d. In the present case, the second locking element 54d can be moved at least from a further storage position (see FIG. 8) into a further locking position (see FIG. 9) and vice versa. The second locking element 54d in this case is pivotally mounted. In addition, the second locking element 54d can be moved, at least partly, in a direction parallel from the direction of movement of the first operator-control element 10d. In the further locking position, the second locking element 54d is designed to lock the first operator-control element 10d in a current operator-control position, in particular an ON position.

(43) A further exemplary embodiment of the disclosure is shown in FIG. 10. The letter e has been appended to the exemplary embodiment of FIG. 10. The further exemplary embodiment of FIG. 10 differs from the previous exemplary embodiments, at least substantially, by a locking unit 12e.

(44) In the present case, the first operator-control element 10e corresponds substantially to a first operator-control element 10d of the previous exemplary embodiment. In addition, a locking element 14e corresponds, at least substantially, to a second locking element 54e of the previous exemplary embodiment.

(45) In addition, an actuator element 16e of the locking unit 12e is realized, at least partly, so as to be variable in shape. The actuator element 16e is realized as wire. The actuator element 16e has a length of between 100 mm and 500 mm, and advantageously of between 200 mm and 300 mm. In the present case, the actuator element 16e has a length of approximately 250 mm. The actuator element 16e has a diameter of between 0.05 mm and 2 mm, and advantageously of between 0.1 mm and 1 mm. In the present case, the actuator element 16e has a diameter of approximately 0.17 mm. The actuator element 16e is realized as a shape-memory element. The actuator element 16e is composed of a nickel-titanium alloy (Nitanol). The actuator element 16e is arranged, at least partly, in the proximity of the first operator-control element 10e. The actuator element 16e is spring-mounted and encompasses the locking element 14e, at least substantially, in the form of a loop. The actuator element 16e in this case has at least two shapes and, by means of a temperature change induced by a current feed to the actuator element 16e, such as, for example, at 0.55 A and 12 V, in particular heating to approximately 90 C., can be converted from the first shape to the second shape. In the present case, the actuator element 16e contracts when fed with current, with a change in length, in the present case of approximately 2%, resulting in locking of the locking element 14e.

(46) Provided in this case is a control unit 30e, which is designed to connect the actuator element 16e to an energy supply unit 40e for the purpose of locking, in particular the first operator-control element 10e, and thereby in particular to enable current to be fed to the actuator element 16e, as a result of which the actuator element 16e contracts and the locking element 14e moves, contrary to a resetting force of a further resetting element 46a, out of a storage position, into a locking position. If the current feed is interrupted and/or blocked, the locking element 14e moves back into the storage position within not more than 2 s, owing to the resetting force of the further resetting element 46a. Alternatively, it is conceivable that an actuator element could be composed, at least partly, of any other material such as, for example, of a nickel-titanium-copper alloy, a copper-zinc alloy, a copper-zinc-aluminum alloy, and/or a copper-aluminum nickel alloy, or the like.

(47) A further exemplary embodiment of the disclosure is shown in FIGS. 11 and 12. The letter f has been appended to the exemplary embodiment of FIGS. 11 and 12. The further exemplary embodiment of FIGS. 11 and 12 differs from the previous exemplary embodiments, at least substantially, by an actuator element 16f.

(48) In this case, the actuator element 16f is realized as a bimetal element that is variable in shape. In this case, a travel change parallel to a direction of actuation of a first operator-control element 10f and/or an actuator travel correspond to approximately 5 mm.