Arrangement and method for conditioning an electromechanical switching element of an electric machine tool

Abstract

The invention relates to an arrangement (7) for conditioning an electromechanical switching element (1) of a power tool (5) that has been affected by an oxidative aging process. The switching element (1) comprises a first contact (2) and a second contact (3) that can be connected to the first contact (2) depending on a switching state. A readout device (9) is provided for detecting the switching state, wherein the readout device (9) is connected to at least one of the contacts (2, 3) of the switching element (1). The arrangement also includes a boost converter (10) with a control input (E) and a signal output (A), wherein the signal output (A) is connected to one of the contacts (2, 3) of the switching element (1).A control device (8) is communicatively connected to the control input (E) of the boost converter (10) and is configured to cause the boost converter (10) to output a voltage at its signal output (A) that is lower than the readout voltage (V). S ) the readout device (9) increased conditioning voltage (V K to provide.

Description

[0001] The invention relates to an arrangement for conditioning an electromechanical switching element of a power tool which is affected by an oxidative aging process, comprising the electromechanical switching element and a readout device for detecting the switching state of the electromechanical switching element, according to the preamble of claim 1.

[0002] The invention also relates to an electric power tool comprising an electric drive and an arrangement for conditioning an electromechanical switching element impaired by an oxidative aging process.

[0003] The invention further relates to a method for conditioning an electromechanical switching element of an electric power tool that is impaired by an oxidative aging process, according to the preamble of claim 10.

[0004] Electromechanical switching elements, i.e., components that use mechanical movements to control an electrical circuit (for example, to switch the circuit on and off, change direction, or interrupt it), are used in a wide variety of applications in electrical engineering. An electromechanical switching element can be, for example, a switch, a push button, or a relay. In power tools, electromechanical switching elements, such as push buttons or switches, are used to control the electric drive of the power tool, in particular to activate or deactivate it as needed.

[0005] Electrical contacts of a switching element are known to be affected by aging processes. The electrical properties of the contact surfaces can be deteriorated, in particular, by the formation of an oxide layer. This oxide layer can continuously thicken due to moisture, depending on the chosen base and / or coating material of the contact, and its wear. An oxide layer on the contact surface reduces its electrical conductivity, which can initially lead to reduced current flow and ultimately to a complete failure of the switching element.

[0006] Mechanically, the problem can sometimes be addressed by designing the contact surfaces in such a way that they are automatically worn down when the contact is closed. However, this measure is generally unreliable and also technically complex.

[0007] To circumvent this problem, US Patent 2024 / 0183060A1 proposes connecting a conditioning circuit in parallel to a readout circuit to detect the switching state of the electromechanical switching element. The oxide layer can then be selectively broken down during readout by a high conditioning current running parallel to the readout branch through the conditioning branch. However, providing this comparatively high conditioning current can be technically complex, reduce the operating time of a battery-powered power tool, and, due to the high electrical load, further reduce the lifespan of the already compromised switching element.

[0008] For further technical background, please also refer to the following publications: DE 11 54 554 A relates to an arrangement for achieving reliable contact with low contact resistance when switching relatively small DC voltages or currents by means of a mechanical contact arrangement, characterized in that, when the contact arrangement is actuated, stored energy is dissipated in a relatively short time over the switching path of the contact arrangement. DE 195 13 615 A1 relates to a contact detection circuit for detecting the open or closed state of an electrical contact, a load driver device for detecting the open or closed state of an electrical contact and for operating loads such as a light source or a motor, and a dental syringe with a built-in lighting device for illuminating, among other things, dental work areas.

[0009] In view of the known state of the art, the object of the present invention is therefore to provide an arrangement for conditioning an electromechanical switching element of a power tool which is affected by an oxidative aging process, ensuring a reliable readout of the switching state, preferably with technically simple means and in particular without damaging the switching element in the long term.

[0010] The present invention also aims to provide an electric power tool with an electromechanical switching element offering increased reliability and service life.

[0011] Furthermore, it is an object of the invention to provide a method for conditioning an electromechanical switching element of an electric tool impaired by an oxidative aging process, which ensures a reliable readout process of the switching state, preferably with technically simple means and in particular without damaging the switching element in the long term.

[0012] The problem is solved for the arrangement with the features listed in claim 1. With regard to the power tool, the problem is solved by the features of claim 9, and with regard to the method by claim 10.

[0013] The dependent claims and the features described below relate to advantageous embodiments and variants of the invention.

[0014] It is a device for conditioning (“pre-wetting”) an electromechanical switching element of an electric power tool that is affected by an oxidative aging process.

[0015] The fact that the electromechanical switching element is affected by an oxidative aging process can be understood in particular to mean that an oxide layer has formed at least partially on at least one of the contact points of the switching element, which reduces the electrical properties, especially the conductivity, compared to the ground state.

[0016] As mentioned above, the electromechanical switching element can be, in particular, a push button, a switch, or a relay. However, the invention is fundamentally suitable for all electromechanical switching elements whose switching state is based on contact between two or more contacts. The invention is therefore not limited to use with push buttons, switches, or relays.

[0017] According to the invention, the arrangement comprises the electromechanical switching element. The switching element includes at least a first contact and a second contact that can be electrically and mechanically connected to the first contact depending on a switching state.

[0018] In principle, the switching element can also have additional contacts, for example a third contact, a fourth contact or even more contacts.

[0019] At least one of the contacts of the switching element can have a contact point, in particular a contact surface, a line contact, or a point contact, via which the contact can be directly connected electrically and mechanically to the other contact. This contact point may be impaired by oxidation or an oxide layer.

[0020] These contacts can be flat contacts, contact pins, spring contacts, end contacts, or any other type of contact. In particular, a combination of different contact types can also be provided, for example, a pin contact on the one hand (first contact) and a flat contact or a planar contact point (second contact) on the other. The specific design of the contacts is not essential within the scope of the invention.

[0021] Where the terms "closed" or "closed" switching element and "closed" switching state are used below and above, this refers specifically to a state of the switching element in which the first contact is electrically and mechanically connected to the second contact. In the "closed" switching state, the switching element is thus able, for example, to close an electrical circuit. Where the terms "open" or "open" switching element and "open" switching state are used below and above, this refers specifically to a state of the switching element in which the first and second contacts are not electrically and mechanically connected. In the "open" switching state, an electrical circuit connected to the switching element can therefore be open.

[0022] According to the invention, the arrangement has a readout device for detecting the switching state of the electromechanical switching element, which is electrically connected to at least one of said contacts of the electromechanical switching element.

[0023] The switching state can be a discrete state ("open" / "closed") that can be converted into a binary switching state ("on" / "off" or "0" / "1"). Alternatively, the switching state can also be a continuous or analog switching state that depends on how forcefully the switching element has been actuated by the user.

[0024] Preferably, the readout circuit is configured to detect the switching state of the switching element by means of a readout voltage.

[0025] Corresponding analog and digital readout circuits are well known in the prior art, particularly for power tool machines (for example, the discrete switching state can be converted into a logical switching state of a digital readout circuit using a pull-up resistor or a pull-down resistor). In principle, any analog and / or digital readout technology for detecting the switching state of the electromechanical switching element can be provided within the scope of the invention.

[0026] According to the invention, the arrangement comprises a boost converter with a control input and a signal output, the signal output being electrically connected to one of the contacts of the electromechanical switching element. A control device is provided which is communicatively connected to the control input of the boost converter and is configured to cause the boost converter, via the control input, to provide a conditioning voltage at its signal output that is higher than the readout voltage of the readout device.

[0027] Advantageously, the conditioning voltage, which is higher than the readout voltage, can break down an oxide layer on the contacts without requiring a high current, as is the case in the prior art. This reduces the electrical load on the switching element. Furthermore, less electrical energy is consumed, which can be particularly advantageous in the case of a battery-powered power tool.

[0028] The control unit can be designed as a microprocessor. Instead of a microprocessor, any other device can be used to implement the control unit, for example, one or more arrangements of discrete electrical components on a printed circuit board, a programmable logic controller (PLC), an application-specific integrated circuit (ASIC), or another programmable circuit, such as a field-programmable gate array (FPGA) or a programmable logic assembly (PLA).

[0029] It should be noted that the control unit may also include other components of the arrangement. For example, the readout device for detecting the switching state may be integrated into the control unit. The boost converter may also be part of the control unit.

[0030] In an advantageous embodiment of the invention, the boost converter may have a self-resonant or self-oscillating circuit. Preferably, the boost converter may be a resonant converter or a so-called Joule-Thief circuit.

[0031] In principle, however, any circuit technology can be used to implement the boost converter within the scope of the invention.

[0032] According to a further development of the invention, the conditioning voltage can be a variable electrical voltage. Preferably, the conditioning voltage is an oscillating electrical voltage.

[0033] The conditioning voltage can, in particular, be a pulsed electrical voltage.

[0034] For example, the conditioning voltage may be designed to oscillate between a reference voltage, in particular a ground potential (GND), and a predefined peak voltage, for example - but not necessarily - sinusoidally or rectangularly.

[0035] In particular, a ramp-shaped conditioning voltage can also be provided, which is initially increased steadily during the conditioning process (up to a predefined maximum value or until the intended result, i.e., the breaking up of the oxide layer, has been achieved).

[0036] In principle, the conditioning voltage can also be a constant voltage.

[0037] According to a further development of the invention, it can be provided that the conditioning voltage (or a maximum value of an oscillating conditioning voltage) is increased compared to the readout voltage of the readout device and / or a supply voltage of the power tool, preferably by a factor of 2 to 10.

[0038] The conditioning voltage can be increased by a factor of 3 to 5.

[0039] In a further development of the invention, the readout voltage can be between 1.0 and 60.0 volts, in particular between 1.0 and 12.0 volts, preferably between 1.5 and 9.0 volts, for example between 3.0 and 5.0 volts. In principle, the readout voltage can be arbitrary, but preferably the upper limits defined in standard IEC 60364-4-41 should not be exceeded to avoid electric shock.

[0040] In principle, the readout voltage within the scope of the invention can be arbitrary. In particular, the readout voltage can be based on the supply voltage of the power tool, for example, on the output voltage of a battery pack of the power tool or a voltage converter of the power tool.

[0041] In a further development of the invention, the current flow ("conditioning current") provided by the boost converter at its signal output can be limited and not exceed 100 milliamperes, preferably not exceeding 50 milliamperes, and more preferably not exceeding 25 milliamperes. In principle, a person skilled in the art can determine the conditioning current limit based on the component-related limitations of the electromechanical switching element or its maximum current carrying capacity (in particular, the maximum current carrying capacity at the end of its service life).

[0042] Limiting the output current flow can be particularly advantageous to avoid overloading the electromechanical switching element during conditioning.

[0043] In an advantageous embodiment of the invention, it can be provided that the control device is configured to cause the boost converter to provide the conditioning voltage only when the electromechanical switching element is in a closed switching state in which the contacts are electrically and mechanically connected.

[0044] If the boost converter is only operated when the electromechanical switching element is in the closed switching state, the energy consumption of the system can be reduced, which can be particularly advantageous in the case of a battery-powered power tool. However, it is also possible to provide the conditioning voltage continuously or to operate the boost converter continuously, which can increase the system's availability.

[0045] In a further development of the invention, it can be provided that the control device is configured to cause the boost converter to provide the conditioning voltage only when - a defined number of switching cycles of the electromechanical switching element has been exceeded; and / or - a defined number of operating hours of the power tool has been exceeded; and / or - a readout current based on reading via the readout voltage falls below a defined threshold.

[0046] By limiting the operation of the boost converter, as proposed above, the energy consumption of the arrangement can be further reduced. For example, with an electromechanical switching element, degradation is generally only to be expected after a defined number of switching cycles or operating hours. The corresponding number of switching cycles or operating hours can be statistically determined by a person skilled in the art for the respective electromechanical switching element or power tool and entered into the control unit.

[0047] To improve the flexibility and operational readiness of the arrangement, it can also be advantageous to monitor the readout current during the switching state reading of the switching element to determine whether it is below a defined threshold. This is because, in the case of oxidative damage to the switching element, a reduced readout current compared to a standard value can be expected. By monitoring the readout current and comparing it to the threshold value to determine whether the boost converter should be operated to condition the switching element, particularly flexible operational capability of the arrangement can be achieved.

[0048] The invention also relates to an electric power tool comprising an electric drive (e.g. an electric motor) and an arrangement for conditioning a switching element according to the preceding and following embodiments.

[0049] Power tools are well known, which is why specific details and features will not be discussed here. In principle, the present invention is suitable for use with any power tool. The power tool used in this invention can be, in particular, a battery-powered power tool and / or a mains-powered power tool. For the purposes of this invention, power tools are understood to include both handheld power tools, such as drills, angle grinders, or the like, and stationary or semi-stationary devices, such as table saws or the like.

[0050] The electromechanical switching element is preferably a user-operated switching element for activating or deactivating the electric drive. However, the invention is not fundamentally limited to this application. The switching element can, for example, also be used to control the direction of rotation of the drive, a lighting device, a (separate) extraction system, etc.

[0051] To activate or deactivate the electric drive, the switching element does not necessarily have to be directly connected to the electric drive. Preferably, the electromechanical switching element is connected via the readout device to an electrical circuit that activates or deactivates the electric drive depending on the detected switching state.

[0052] The invention also relates to a method for conditioning an electromechanical switching element of a power tool that has been affected by an oxidative aging process, wherein a switching state of the electromechanical switching element is read out by means of a readout voltage. It is provided that, at least temporarily during the readout of the switching state, a conditioning voltage higher than the readout voltage is supplied to the electromechanical switching element in order to penetrate an oxide layer on at least one contact of the electromechanical switching element.

[0053] Preferably, the conditioning voltage can be provided only at defined times, for example in the case of a reduced readout current.

[0054] Preferably, the conditioning voltage is increased at least until the readout current exceeds a predetermined threshold value, indicating a breakthrough of the oxide layer, and particularly preferably to a value above the readout voltage.

[0055] Advantageously, within the scope of the invention, a readout process of the switching state of the switching element can take place independently of the readout voltage or supply voltage of the power tool or a layer thickness of the oxide layer on the contacts of the switching element.

[0056] Features described in connection with one of the subject matter of the invention, in particular those given by the arrangement according to the invention, the power tool according to the invention, the method according to the invention, and the computer program according to the invention, can also be advantageously implemented for the other subject matter of the invention. Likewise, advantages mentioned in connection with one of the subject matter of the invention can also be understood to relate to the other subject matter of the invention.

[0057] Exemplary embodiments of the invention are described in more detail below with reference to the drawings.

[0058] The figures each show preferred embodiments in which individual features of the present invention are combined with one another. Features of an embodiment can also be implemented independently of the other features of the same embodiment and can therefore be readily combined by a person skilled in the art to form further meaningful combinations and subcombinations with features of other embodiments.

[0059] In the figures, functionally identical elements are provided with the same reference symbols.

[0060] They show schematically: Fig. 1 an electromechanical switching element of an arrangement according to the invention impaired by an oxidative aging process in a single representation; Fig. 2 an arrangement according to the invention of an electric tool for conditioning an electromechanical switching element impaired by an oxidative aging process; Fig. 3 a boost converter comprising a “Joule-Thief” circuit in a single illustration, according to a first embodiment; and Fig. 4 a boost converter according to a further embodiment, in conjunction with the electromechanical switching element.

[0061] In Fig. Figure 1 is an example of an electromechanical switching element 1, schematically depicted, which has been affected by an oxidative aging process. The example shown is in Fig. The switching element 1 shown is a push button whose direction of actuation B is indicated by an arrow.

[0062] The electromechanical switching element 1 comprises a first contact 2 and a second contact 3 which, depending on the switching state, is directly electrically and mechanically connected to the first contact 2. Fig. Figure 1 shows the switching element 1 in an open switching state, in which the two contacts 2 and 3 are spaced apart and thus galvanically isolated from each other. As also shown in Fig. As indicated in Figure 1, an oxide layer 4, formed by an aging process, is present on the opposing contact surfaces of contacts 2 and 3. This oxide layer 4 reduces the electrical conductivity of the contacts, thus preventing the reliable reading of the switching state of the switching element 1.

[0063] The invention aims to ensure that even with a correspondingly impaired electromechanical switching element 1, a reliable reading of the switching state can still be carried out.

[0064] For example, in Fig. Figure 2 schematically depicts an electric power tool 5 as a "black box" comprising an electric drive 6 and an arrangement 7 for conditioning an electromechanical switching element 1 of the electric power tool 5 that is affected by an oxidative aging process. The electromechanical switching element 1 can be, for example, a push button (e.g., as in Fig. 1 shown), a switch, a relay or another type of switching element.

[0065] Preferably, the electromechanical switching element 1 is a switching element 1 that can be manually operated by a user of the power tool 5 to activate or deactivate the electric drive 6.

[0066] To activate and deactivate the electric drive 6, in Fig. 2 a control device 8 is indicated (for example, a microcontroller or other electrical circuit arrangement) which has a readout device 9 for detecting the switching state of the electromechanical switching element 1. The switching state can be read out, in particular, by detecting a readout voltage V. S (cf.) Fig. 4) The reading device 9 is electrically connected to at least one of the aforementioned contacts 2, 3 of the electromechanical switching element 1, as shown in Fig. 2 indicated.

[0067] To ensure the readout process even with an oxidatively impaired switching element 1, the arrangement 7 includes a boost converter 10 with a control input E (see also the Fig. 3 and Fig. 4) and at least one signal output A. The signal outputs A are in Fig. 2 is electrically connected to contacts 2 and 3 of the electromechanical switching element 1. The control input E of the boost converter 10 is communicatively connected to the control unit 8, the control unit 8 being configured to cause the boost converter 10, via the control input E, to output a voltage at its at least one signal output A that is lower than the readout voltage V. S the reading device 9 increased conditioning voltage V K (see the Fig. 3 and Fig. 4) to provide. At this conditioning voltage V Kpreferably a variable electrical voltage, preferably an oscillating voltage, which differs from the readout voltage V S and / or a supply voltage V+ (see below). Fig. 4) the output current of the power tool 5 is increased by a factor of 2 to 10, for example by a factor of 3 to 5. Optionally, the output current flow of the boost converter 10 can be limited.

[0068] It may be provided that the control unit 8 is configured to cause the boost converter 10 to apply the conditioning voltage V only when K to provide when the electromechanical switching element 1 is in its closed switching state, in which the contacts 2, 3 are in electrical and mechanical contact.

[0069] Furthermore, it can be provided that the control unit 8 is configured to cause the boost converter 10 to increase the conditioning voltage V only when necessary. Kto be provided when a defined number of switching cycles of the electromechanical switching element 1 have been exceeded, a defined number of operating hours of the power tool 5 have been exceeded and / or a fault has occurred during readout via the readout voltage V S The based readout stream falls below a defined threshold.

[0070] In an advantageous way, at least temporarily during the reading of the switching state at the electromechanical switching element 1, a voltage opposite to the readout voltage V can be applied. S and / or supply voltage V+ of the power tool 5 increased conditioning voltage V K must be provided to penetrate an existing oxide layer on at least one contact 2, 3 of the electromechanical switching element 1.

[0071] The boost converter 10 can preferably be a self-resonant or self-oscillating circuit. For example, the boost converter 10 can be a resonant converter or a Joule-Thief circuit.

[0072] An upconverter 10, designed as a Joule-Thief circuit, is exemplified in Fig. 3 indicated. This circuit type is generally known, which is why its construction and function will only be briefly discussed. The in Fig. The boost converter 10 shown in Figure 3 has a bipolar transistor T1 (type NPN) whose emitter is connected to the reference potential GND of the power tool 5. The base and collector sides of the bipolar transistor T1 are connected to electromechanically coupled inductors H1,2, at the opposite ends of which the input voltage of the boost converter 10 is applied (to its control input E). The control input E can preferably be directly connected to the control unit 8.

[0073] The signal output A of the boost converter 10 is connected to the collector of the bipolar transistor T1 and can accordingly be connected to a contact 2, 3 of the switching element 1, whereby the other contact 3, 2 of the switching element 1 can be connected to the reference potential GND (in Fig. 3 not shown).

[0074] A more specific variant of a boost converter 10 according to a further embodiment is shown by way of example in conjunction with the electromechanical switching element 1. Fig. 4 indicated.

[0075] The electromechanical switching element 1 is connected to the reference potential GND at one of its contacts 2, 3 and to the other contact 3, 2 via a pull-up resistor R. UP connected to the supply voltage V+ of the power tool 5. The readout device 9 for detecting the switching state of the switching element 1 can therefore be connected, for example, to node V. S between the pull-up resistor R UP and connected to switching element 1. For recording and monitoring the readout current i S The reading device 9 and / or control device 8 can also be connected to another node K between the pull-up resistor R UPand be connected to the supply voltage V+ to control the current flow through the pull-up resistor R UP and thus to detect the current flow through switching element 1 and compare it with a defined threshold value. In this way, it can be determined whether switching element 1 is subject to an oxidative aging process and whether conditioning is required.

[0076] The previously mentioned conditioning voltage V K is through the in Fig. The signal from the four indicated boost converters 10 is fed via a separate branch into contact 3, 2 of the switching element 1, which is also used for readout. This ensures that the voltage is not significantly different from the readout voltage V. S increased conditioning voltage V K the reading process is not affected - and vice versa - the in Fig. The 4 indicated diodes D1,2 should be arranged accordingly on the respective branch.

[0077] Therefore, within the framework of conditioning, an increased or sufficient readout current i S The conditioning voltage V can be detected. K or the upconverter 10 can be deactivated again by the control unit 8.

Claims

[1] Arrangement (7) for conditioning an electromechanical switching element (1) of an electric power tool (5) affected by an oxidative aging process, comprising - the electromechanical switching element (1), comprising a first contact (2) and a second contact (3) that can be electrically and mechanically connected to the first contact (2) depending on a switching state; and - a readout device (9) for detecting the switching state of the electromechanical switching element (1) by means of a readout voltage (V S ), wherein the reading device (9) is electrically connected to at least one of said contacts (2, 3) of the electromechanical switching element (1), characterized by - a boost converter (10) with a control input (E) and a signal output (A), wherein the signal output (A) is electrically connected to one of said contacts (2, 3) of the electromechanical switching element (1); and - a control device (8) which is communicatively connected to the control input (E) of the boost converter (10) and is configured to cause the boost converter (10) to output a voltage at its signal output (A) that is higher than the readout voltage (V) as required via the control input (E). S ) the readout device (9) increased conditioning voltage (V K to provide. [2] Arrangement (7) according to claim 1, characterized by , that the boost converter (10) has a self-resonant or self-oscillating circuit, preferably a resonant converter or a Joule-Thief circuit. [3] Arrangement (7) according to claim 1 or 2, characterized by , that the conditioning voltage (V K ) is a variable electrical voltage, preferably an oscillating electrical voltage. [4] Arrangement (7) according to any one of claims 1 to 3, characterized by , that the conditioning voltage (V K ) compared to the readout voltage (VS ) is increased by a factor of 2 to 10, for example by a factor of 3 to 5. [5] Arrangement (7) according to any one of claims 1 to 4, characterized by , that the readout voltage (V S ) 1.0 to 60.0 volts, in particular 1.0 to 12.0 volts, preferably 1.5 to 9.0 volts, for example 3.0 to 5.0 volts. [6] Arrangement (7) according to any one of claims 1 to 5, characterized by , that the current flow provided by the boost converter (10) at its signal output (A) is limited and does not exceed 100 milliamperes, preferably does not exceed 50 milliamperes, more preferably does not exceed 25 milliamperes. [7] Arrangement (7) according to any one of claims 1 to 6, characterized by , that the control device (8) is configured to cause the boost converter (10) to increase the conditioning voltage (V K) only when the electromechanical switching element (1) is in a closed switching state in which the contacts (2, 3) are electrically and mechanically in contact. [8] Arrangement (7) according to any one of claims 1 to 7, characterized by , that the control unit (8) is configured to cause the boost converter (10) to increase the conditioning voltage (V) only when K ) to provide if - a defined number of switching cycles of the electromechanical switching element (1) has been exceeded; and / or - a defined number of operating hours of the power tool (5) has been exceeded; and / or - one based on the readout voltage (V S ) based readout stream (is) falls below a defined threshold. [9] Power tool (5) comprising an electric drive (6) and an arrangement (7) according to one of claims 1 to 8, wherein the electromechanical switching element (1) is preferably a switching element (1) that can be manually operated by a user to activate or deactivate the electric drive (6). [10] Method for conditioning an electromechanical switching element (1) of an electric power tool (5) that is affected by an oxidative aging process, wherein a switching state of the electromechanical switching element (1) is determined by means of a readout voltage (V S ) is read out, characterized by , that at least temporarily during the reading of the switching state at the electromechanical switching element (1) a voltage opposite to the readout voltage (V) S ) increased conditioning voltage (V K) is provided to penetrate an oxide layer (4) on at least one contact (2, 3) of the electromechanical switching element (1).

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