Power Tools

Abstract

To provide an electric power tool that has a relatively lightweight and compact configuration by simplifying a selective grip with respect to components different from each other and a structure for rotation.SOLUTION: An electric power tool includes: a wrench head including a rotation socket that is rotatable; and a spanner tool fitted to the rotation socket. The rotation socket and the spanner tool are configured so as to individually grip a first component and a second component which are adjacent to each other.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present invention relates to a power tool that is relatively light and has a simple structure. 【Background Art】 【0002】 Wheel alignment is for adjusting the steering property of the front wheels during the running of a vehicle. When the wheel alignment is deviated, the life of the tire becomes short, and the vehicle and fuel consumption performance deteriorate. 【0003】 Basically, wheel alignment includes caster, camber, toe, etc. 【0004】 Caster refers to the angle at which the Steering axis is inclined forward or backward with respect to the vertical line when the vehicle is viewed from the side. Caster is an essential element for ensuring straight-ahead stability. The smaller the caster, the more the restoring force of the steering wheel can be improved, and an unstable running direction can be prevented. However, the rapid cornering performance deteriorates. 【0005】 Camber is for preventing tire wear and improving steering operation. According to the angle at which the upper or lower part of the tire on the vehicle is deformed inward and outward on the vertical line, it is divided into Negative Camber, Positive Camber, and Neutral Camber. Recently, most vehicles apply Negative Camber with the development of suspension and vehicle body technology. In the case of Negative Camber, when the vehicle corners, the vehicle body tilts due to centrifugal force. At this time, the contact area of the outer tire increases, and stable cornering is possible. 【0006】 Toe refers to the point in front of the tires in the direction of travel when viewed from above. When the front part of the tire is tilted inward, it is called toe-in, and when it is tilted outward, it is called toe-out. If the toe-out is too large, the inner part of the tire will wear down faster, and if the toe-in is too large, the outer part of the tire will wear down faster. In both cases, the vehicle experiences more road resistance, resulting in a decrease in driving quality and a decrease in fuel efficiency. Appropriate toe-in improves straight-line stability and counteracts the inner wear caused by negative camber. 【0007】 As is well known, the toe of a vehicle is adjusted and set by adjusting the length of the tie rod assemblies of the steering mechanism. The steering mechanism includes a steering rack and pinion (or steering center link) and a pair of tie rod assemblies pivotably connected to both ends of the steering rack and pinion. Each tie rod assembly is configured to transmit force from the steering rack and pinion to the vehicle's knuckle, and each tie rod assembly includes an inner tie rod and an outer tie rod. The inner tie rod has a male threaded portion and a hex portion adjacent to the male threaded portion at its end, and the outer tie rod has a female threaded portion at its end, with the male threaded portion of the inner tie rod screwing into the female threaded portion of the outer tie rod. The overall length of each tie rod assembly is adjusted by the movement of the male threaded portion of the inner tie rod along the axial direction of the female threaded portion of the outer tie rod as the inner tie rod rotates. When the lock nut is screwed onto the male thread of the inner tie rod, and the lock nut locks the male thread of the inner tie rod and the female thread of the outer tie rod, relative rotation of the male thread of the inner tie rod and the female thread of the outer tie rod is prevented. Specifically, a power tool such as a nut runner selectively grips and rotates the hexagonal part of the lock nut and inner tie rod of the tie rod assembly of the steering mechanism, thereby adjusting the overall length of the tie rod assembly, and thus adjusting and setting the toe of the vehicle. 【0008】 However, conventional power tools are configured to selectively grip the outer tie rod, the hexagonal portion of the inner tie rod, and the lock nut, and to selectively rotate the inner tie rod and lock nut. In particular, because the lock nut and inner tie rod have different outer diameters, the structure for selective gripping the lock nut and inner tie rod becomes very complex. In other words, conventional power tools have a very complex structure, require a relatively large number of parts, and therefore have a relatively heavy weight and a relatively large size. For this reason, conventional power tools are configured to cooperate with robots with a large payload, and the power tools and robots as a whole are large and heavy, making it difficult to install them in the confined space of wheel alignment measurement equipment, and resulting in the disadvantage of relatively long maintenance times in the confined space of wheel alignment measurement equipment and reduced productivity. 【0009】 Furthermore, conventional toe adjustment tools require a relatively large number of parts, which increases the likelihood of malfunction and results in a relatively long wheel alignment time. 【0010】 The information contained in this background section is provided to facilitate understanding of the background of the invention and may include matters that are not prior art known to a person ordinary in the art to which this technology belongs. [Prior art documents] [Patent Documents] 【0011】 [Patent Document 1] Japanese Patent Publication No. 2020-093720 [Overview of the project] [Problems that the invention aims to solve] 【0012】 The present invention has been derived in view of the above points, and aims to provide an electric tool having a relatively light and compact configuration by simplifying the structure for selective gripping and rotation of different components. [Means for solving the problem] 【0013】 An electric tool according to an embodiment of the present invention for achieving the above-described objective may include a wrench head including a rotatable rotary socket and a spanner tool mounted on the rotary socket. The rotary socket and the spanner tool may be configured to grip adjacent first and second components separately. 【0014】 In this way, the spanner tool is mounted on the rotary socket, and the spanner tool and the rotary socket can individually grip the adjacent first and second components. This allows for efficient and easy assembly, adjustment, and setting of various components, resulting in a power tool with a simple structure and light weight. 【0015】 The rotating socket may have a first open groove and a plurality of inner flat surfaces that define the first open groove. The first component may have a plurality of flat surfaces. 【0016】 As a result, when the first component is housed in the first open groove, the plurality of inner flat surfaces can accurately grip the flat surface of the first component. 【0017】 The spanner tool may include a tool housing mounted on the rotary socket and a spanner member mounted in the tool housing so as to be movable between an ungrip position in which the second component is ungripned and a grip position in which the second component is gripped. 【0018】 In this way, the spanner member moves between the ungrip position and the grip position in the tool housing, which facilitates gripping and ungrip of the second component. In particular, the spanner member can grip or ungrip the second component while the rotary socket is gripping the first component. 【0019】 The tool housing may have a second open groove, and the wrench member may have a third open groove, the second open groove may be aligned with the first open groove. The second open groove may be relatively larger in size than the third open groove. When the wrench member is in the ungrip position, the third open groove may deviate from the second open groove. When the wrench member is in the grip position, the third open groove may be located within the second open groove. 【0020】 Thus, since the second open groove of the tool housing is aligned with the first open groove of the rotary socket, when the first open groove grips the first component, the second open groove can accommodate the second component but does not grip it. Furthermore, by moving the wrench member between the ungrip position and the grip position, the wrench member can ungrip and grip the second component housed in the second open groove. 【0021】 The tool housing may have a slot into which the wrench member is movably housed, and the slot may have a shape corresponding to the wrench member. 【0022】 In this way, the movement of the spanner member can be accurately guided by moving along the slot of the tool housing between the ungrip position and the grip position. 【0023】 The spanner tool can further include a spring that deflects the spanner member to the angled grip position. 【0024】 Thereby, when a grip on the second component is not required, the spanner tool can be maintained at the angled grip position by the spring, and the spanner member can move from the angled grip position to the grip position only when a grip on the second component is required. 【0025】 The spanner tool can further include a stopper member that restricts the spanner member to the angled grip position, and the stopper member can be attached to the tool housing. 【0026】 The spanner member can have a guide groove, the upper end of the guide groove can have a stopper surface, the stopper member can have a stopper protrusion that is received in the guide groove, and the spanner member can be restricted at the angled grip position when the stopper protrusion contacts the stopper surface. 【0027】 In this way, by the stopper member restricting the position of the spanner member to the angled grip position, it can be prevented that the spanner member detaches from the tool housing. 【0028】 The stopper member can have a mounting protrusion, the stopper protrusion can protrude from the mounting protrusion, the tool housing can have a mounting hole to which the mounting protrusion of the stopper member is coupled, the mounting hole can communicate with the slot, and the guide groove can lead to the mounting hole. 【0029】 Thereby, when the mounting protrusion of the stopper member fits into the mounting hole of the tool housing, the stopper protrusion can be received in the guide groove of the spanner member, and the stopper member can be easily and accurately attached to the tool housing. 【0030】 An electric tool according to an embodiment of the present invention may further include a first gripper configured to ungrip and grip the outer surface of the spanner tool, wherein the spanner member can move to the ungrip position when the first gripper ungrips the outer surface of the spanner tool, and the spanner member can move to the grip position when the first gripper grips the outer surface of the spanner tool. 【0031】 In this way, by the first gripper ungripping and gripping the outer surface of the spanner tool, the spanner member of the spanner tool can be precisely moved to the ungripped position and the gripped position. 【0032】 The first gripper may include a first actuator and a pair of first gripping members configured to move by the first actuator. The pair of first gripping members may move between an ungrip position in which the outer surface of the spanner tool is undripped and a gripping position in which the outer surface of the spanner tool is gripped. 【0033】 The pair of first grip members can be arranged facing each other so as to surround the outer circumferential surface of the spanner tool. 【0034】 In this way, the pair of first gripping members can grip and release the entire outer surface of the spanner tool, thereby enabling precise movement of the spanner member. 【0035】 The first gripper may further include a pair of first guide portions provided individually at the upper ends of the pair of first grip members. 【0036】 Each first guide portion and the upper end of each corresponding first grip member are integrally formed, and the first guide portion may have a first tapered surface that guides the second component gripped by the wrench member. 【0037】 In this way, the second component can be accurately guided and positioned toward the wrench member via the first tapered surface of the first guide portion, thereby enabling the wrench member to accurately grip the second component. 【0038】 Each of the first guide portions may extend from the upper end of the corresponding first grip member to cover the upper part of the wrench head. 【0039】 In this way, the first guide portion extends from the upper end of the first grip member to the upper part of the wrench head, thereby not only guiding the second component toward the spanner member but also guiding the first component toward the rotating socket. 【0040】 An electric tool according to an embodiment of the present invention may further include a second gripper configured to grip and ungrip a third component adjacent to the first component. 【0041】 In this way, when the second gripper grips the third component, the wrench head can rotate the first component more accurately and stably. 【0042】 The second gripper may include a second actuator and a pair of second gripping members configured to move by the second actuator. 【0043】 The pair of second grip members can be arranged facing each other so as to surround the outer surface of the third component. 【0044】 In this way, the pair of second grip members can grip and release the entire outer surface of the third component, thereby allowing the rotary socket to rotate the first component more accurately and stably. 【0045】 The second gripper may include a pair of second guide portions provided individually at the upper ends of the pair of second grip members. Each second guide portion and the corresponding second grip member may form a single body, and each second guide portion may have a second tapered surface that guides the third component. 【0046】 This allows the third component to be precisely guided and positioned between the pair of second grip members via the second tapered surface of the second guide portion. 【0047】 The system further includes a supporting body extending from the wrench head, and the wrench head and the supporting body can be mounted on a robot arm via a bracket assembly. 【0048】 As a result, the structure for gripping two or more different components can be made more compact overall by mounting the spanner tool on the rotating socket of the wrench head, which in turn reduces its weight relatively, allowing the use of a small robot with a relatively small payload capacity. This allows the power tool, along with the small robot, to be made smaller overall, which has the advantage of being easier to install in the confined space of wheel alignment measurement equipment. [Effects of the Invention] 【0049】 According to the present invention, a relatively light and compact power tool can be realized by simplifying the structure for selective gripping and rotation of different components. In particular, because the power tool is realized with a relatively light and simple structure, a small robot with a relatively small payload can be used as the robot to which the power tool is mounted. As a result, the power tool, together with the small robot, can be made to be small overall, making it easy to install in the confined space of wheel alignment measurement equipment. 【0050】 Furthermore, the simple structure of the electric tool makes maintenance easy, resulting in relatively shorter repair times. The small number of required parts allows for a simpler overall structure, which in turn reduces the likelihood of malfunctions and lowers overall installation costs. In particular, when performing wheel alignment using the electric tool of the present invention, the overall wheel alignment time can be shortened. [Brief explanation of the drawing] 【0051】 [Figure 1] This is a perspective view illustrating an electric tool according to an embodiment of the present invention. [Figure 2] This is a view from the direction of arrow A in Figure 1. [Figure 3] This is a view from the direction of arrow B in Figure 1. [Figure 4] This figure illustrates a wrench head of an electric tool according to an embodiment of the present invention. [Figure 5] This is an exploded perspective view illustrating the wrench head of an electric tool according to an embodiment of the present invention, disassembled from the bracket assembly. [Figure 6] This is a perspective view illustrating an electric tool according to an embodiment of the present invention, in which the wrench head is attached to a bracket assembly. [Figure 7] This figure illustrates an electric tool according to an embodiment of the present invention, in which a spanner tool is mounted on the rotating socket of the wrench head. [Figure 8]This figure illustrates an electric tool according to an embodiment of the present invention, in which the first gripper is mounted in close proximity to the first surface of the wrench head via a bracket assembly. [Figure 9] This figure illustrates an electric tool according to an embodiment of the present invention, in which the second gripper is mounted in close proximity to the second surface of the wrench head via a bracket assembly. [Figure 10] This is a perspective view illustrating a wrench tool of an electric tool according to an embodiment of the present invention. [Figure 11] This is an exploded perspective view illustrating the disassembled components of a wrench tool, an electric tool according to an embodiment of the present invention. [Figure 12] This is a cross-sectional view illustrating the inside of a wrench tool of an electric tool according to an embodiment of the present invention. [Figure 13] This is a cross-sectional view shown along the CC line in Figure 12. [Figure 14] This figure illustrates that the wrench member is positioned in the ungrip position within the tool housing of an electric tool according to an embodiment of the present invention. [Figure 15] This figure illustrates that the wrench member is positioned at the grip position within the tool housing of an electric tool according to an embodiment of the present invention. [Figure 16] This figure illustrates an electric tool according to an embodiment of the present invention being separated from a tie rod assembly by a robot. [Figure 17] This figure illustrates how an electric tool according to an embodiment of the present invention is positioned on a tie rod assembly by a robot. [Figure 18] This is an enlarged view of the area indicated by arrow D in Figure 17. [Figure 19] This is a view from the point indicated by arrow E in Figure 18, illustrating the state in which the wrench tool has released its grip on the flat portion of the inner tie rod. [Figure 20] This is a view from the point indicated by arrow E in Figure 18, illustrating the state in which the spanner tool grips the flat portion of the inner tie rod. [Figure 21]This is a block diagram illustrating an automatic wheel alignment adjustment system for a vehicle to which an electric tool according to an embodiment of the present invention can be applied. [Modes for carrying out the invention] 【0052】 Hereinafter, some embodiments of the present invention will be described in detail with reference to illustrative drawings. When assigning reference numerals to the components in each drawing, it should be noted that, as far as possible, the same component will have the same reference numeral even if it is shown in different drawings. Furthermore, when describing embodiments of the present invention, if it is determined that a specific description of a related known configuration or function would hinder understanding of embodiments of the present invention, such detailed description will be omitted. 【0053】 In describing the components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. Such terms are used to distinguish a component from other components, and the terms do not limit the nature, order, or sequence of the component. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as those generally understood by a person of ordinary skill in the art to which the present invention pertains. Terms as defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. 【0054】 Referring to Figure 1, the power tool 10 according to an embodiment of the present invention may include a wrench head 11 having a rotating socket 12 and a spanner tool 15 mounted on the rotating socket 12. 【0055】 Referring to Figures 4 and 5, the wrench head 11 is mounted on the upper end of the supporting body 13, and the wrench head 11 may include a rotatable rotary socket 12. The rotary socket 12 may be circular in shape with a first open recess 12a, and the first open recess 12a of the rotary socket 12 may be configured to accommodate and grip a first component. The rotary socket 12 may have a plurality of inner flat surfaces 12b, 12c, 12d, 12e that define the first open recess 12a, and the inner flat surfaces 12b, 12c, 12d, 12e of the rotary socket 12 can grip the flat surfaces of the flat portion. Thus, when the first component is accommodated in the first open recess 12a, the plurality of inner flat surfaces 12b, 12c, 12d, 12e can grip the first component. For example, the first open groove 12a can be limited by four inner flat surfaces 12b, 12c, 12d, and 12e capable of gripping the hexagonal portion. 【0056】 The first open groove 12a of the rotating socket 12 can have a size and shape that matches the size and shape of the first component, thereby allowing the rotating socket 12 to be configured to loosen or tighten the first component by rotating the first component which has multiple flat surfaces, such as a nut or bolt. 【0057】 For example, the first component can be a flatted portion having multiple flat surfaces, such as a hexagonal portion. For instance, as shown in Figure 16, the first component can be a lock nut 4 of the tie rod assembly 3 of the steering mechanism 1. The lock nut 4 can have a hexagonal portion with six flat surfaces. This allows the first open groove 12a of the rotary socket 12 to accommodate the lock nut 4 of the tie rod assembly 3 of the steering mechanism 1, so that when the first open groove 12a of the rotary socket 12 accommodates the lock nut 4, the inner flat surfaces 12b, 12c, 12d, and 12e of the rotary socket 12 can grip the lock nut 4. 【0058】 The wrench head 11 may have a first surface 41 facing a first direction and a second surface 42 facing a second direction opposite to the first direction. This allows the first surface 41 and the second surface 42 of the wrench head 11 to face each other. The rotary socket 12 may have a first surface 51 facing a first direction and a second surface 52 facing a second direction opposite to the first direction. This allows the first surface 51 and the second surface 52 of the rotary socket 12 to face each other. Referring to Figures 4, 5, and 6, the first surface 51 of the rotary socket 12 may be flush with the first surface 41 of the wrench head 11. Referring to Figure 9, the second surface 52 of the rotary socket 12 may be flush with the second surface 42 of the wrench head 11. 【0059】 The wrench head 11 may include a drive mechanism (not shown) provided inside it, which may be configured to rotate the rotating socket 12 clockwise and counterclockwise. In one example, the drive mechanism may include a gear train (not shown) and a drive actuator provided inside the wrench head 11, and the rotating socket 12 may have a plurality of teeth on its outer surface that mesh with some of the gears of the gear train (not shown). 【0060】 The wrench head 11 can be mounted on the upper end of the supporting body 13, and the supporting body 13 can extend from the wrench head 11 for a predetermined length. In one example, a drive actuator can be provided within the supporting body 13. 【0061】 The supporting body 13 may have a cylindrical shape with a predetermined radius, and the mounting portion 13a may be provided in the middle of the supporting body 13. The outer diameter of the mounting portion 13a may be larger than the outer diameter of the supporting body 13, and the mounting portion 13a may have a flat mounting surface 13b. The mounting portion 13a can be coupled to a bracket assembly 20, which will be described later. 【0062】 Referring to Figures 1 to 3, the power tool 10 according to an embodiment of the present invention can be mounted on a bracket assembly 20. Referring to Figure 5, the bracket assembly 20 may include a first bracket 21 having a slot 21a, a second bracket 22 perpendicular to the first bracket 21, and a third bracket 23 detachably mounted on the second bracket 22. 【0063】 Referring to Figures 5 and 6, the first bracket 21 can be a flat plate shape having a predetermined area. Referring to Figure 6, the lower part of the wrench head 11 can be inserted into the slot 21a of the first bracket 21. 【0064】 The second bracket 22 can be a flat plate shape extending from a portion adjacent to one end of the first bracket 21. In particular, the second bracket 22 can extend in a direction perpendicular to the first bracket 21. The mounting surface 13b of the mounting portion 13a of the supporting body 13 can be detachably attached to a portion of the second bracket 22 via a plurality of fasteners (screws). 【0065】 The second bracket 22 may have an upper mounting portion 22a and a lower mounting portion 22b. The upper mounting portion 22a may be rectangular in shape, and as shown in Figure 6, the third bracket 23 may be detachably attached to the upper mounting portion 22a via a plurality of fasteners (screws). The lower mounting portion 22b may be circular in shape, and as shown in Figures 16 and 17, the lower mounting portion 22b may be detachably attached to the arm of the robot 9 via a plurality of fasteners (screws). 【0066】 The third bracket 23 may have a "U" shaped cross-section so as to wrap around the supporting body 13, and thus the third bracket 23 may have two ends. As shown in Figure 6, the third bracket 23 wraps around the top of the supporting body 13, and the two ends of the third bracket 23 can be connected to the upper mounting portion 22a of the second bracket 22 via a number of screws (e.g., four screws). Thus, the supporting body 13 can be supported by the upper mounting portion 22a of the second bracket 22 and the third bracket 23. 【0067】 Referring to Figures 16 and 17, the bracket assembly 20 can be mounted on a moving mechanism such as a robot 9. Specifically, the power tool 10 can be moved by the robot 9 by being mounted on the arm of the robot 9 via the bracket assembly 20. In the embodiment of the present invention, the power tool 10 has a spanner tool 15 mounted on the rotating socket 12 of the wrench head 11, which allows the overall structure for gripping two or more different components to be compact, resulting in a relatively light weight, and the robot 9 can be a small robot with a relatively small payload capacity. Thus, the power tool 10 can be constructed in a small size overall together with a small robot, which has the advantage of being easy to install in the confined space of wheel alignment measurement equipment. 【0068】 Referring to Figure 7, the spanner tool 15 can be detachably mounted to the rotating socket 12 of the wrench head 11 via a plurality of fasteners (screws), and the spanner tool 15 can be configured to grip and release a second component adjacent to a first component. This allows the spanner tool 15 to rotate in the same direction as the rotating socket 12. The axis of rotation of the spanner tool 15 can be aligned with or eccentric to the axis of rotation of the rotating socket 12. 【0069】 Referring to Figures 10 to 12, the spanner tool 15 may include a tool housing 31 mounted on the rotary socket 12 and a spanner member 32 mounted in the tool housing 31 so as to be movable between an ungrip position and a grip position. 【0070】 The tool housing 31 can be detachably mounted on the first surface 51 of the rotary socket 12 via fasteners or the like. The tool housing 31 may have a second open groove 31a, and the tool housing 31 may have a circular shape similar to that of the rotary socket 12. The tool housing 31 may have two inner flat surfaces 31b, 31c and an inner curved surface 31d that define the second open groove 31a. The inner curved surface 31d connects the lower ends of the two inner flat surfaces 31b, 31c, so that the inner curved surface 31d and the two inner flat surfaces 31b, 31c can form a U-shape. The second open groove 31a of the tool housing 31 may be aligned with the first open groove 12a of the rotary socket 12. 【0071】 The tool housing 31 may have a slot 33 for housing a wrench member 32, the wrench member 32 may be movably housed within the slot 33, and the slot 33 may have a shape that matches the shape of the wrench member 32. This allows the wrench member 32 to be movably mounted within the slot 33 of the tool housing 31, the movement of the wrench member 32 may be guided along the slot 33, and the wrench member 32 may move precisely between an ungrip position and a grip position within the tool housing 31. 【0072】 The wrench member 32 may have a third open groove 32a, which may have a shape similar to the second open groove 31a of the tool housing 31. The wrench member 32 may have two inner flat surfaces 32b, 32c and an inner curved surface 32d that define the third open groove 32a. The inner curved surface 32d connects the lower ends of the two inner flat surfaces 32b, 32c, so that the inner curved surface 32d and the two inner flat surfaces 32b, 32c can form a "U" shape, thereby allowing the wrench member 32 to have two upper ends. In particular, the wrench member 32 may have a substantial "U" shape externally. When the second component is accommodated in the third open groove 32a, the multiple inner flat surfaces 32b, 32c can grip the second component. 【0073】 When the sizes of the first component and the second component are different, the third open groove 32a of the spanner member 32 may have a different size from the first open groove 12a of the rotary socket 12. For example, when the size of the first component, the lock nut 4, is larger than the size of the flat portion 5 of the second component, the inner tie rod 3a, the size of the first open groove 12a may be larger than the size of the third open groove 32a. 【0074】 The third open groove 32a of the spanner member 32 can have a size that matches the second component, and the second open groove 31a of the tool housing 31 can have a size that is relatively larger than the outer diameter of the second component. As a result, the second open groove 31a of the tool housing 31 can have a size that is relatively larger than the third open groove 32a of the spanner member 32, and the second open groove 31a of the tool housing 31 can accommodate the second component but cannot grip it. 【0075】 The wrench member 32 can be configured to grip and rotate a second component adjacent to the first component. For example, as shown in Figure 16, the second component can be the flat portion 5 of the inner tie rod 3a of the tie rod assembly 3 of the steering mechanism 1, and the flat portion 5 can be a hexagonal portion having six flat surfaces. This allows the third open groove 32a of the wrench member 32 to accommodate the flat portion 5 of the inner tie rod 3a, and so that when the third open groove 32a of the wrench member 32 accommodates the flat portion 5 of the inner tie rod 3a, the inner flat surfaces 32b and 32c of the wrench member 32 can grip the flat portion 5 of the inner tie rod 3a. 【0076】 Specifically, the wrench member 32 can be configured to move between an ungrip position (see Figures 14 and 19) in which it ungrips the second component and a grip position (see Figures 15 and 20) in which it grips the second component. Referring to Figures 14 and 19, when the wrench member 32 is in the ungrip position, the third open groove 32a of the wrench member 32 can deviate from the second open groove 31a of the tool housing 31, and at least a portion of the wrench member 32 can protrude from the outer circumferential surface of the tool housing 31. Referring to Figures 15 and 20, when the wrench member 32 is in the grip position, the wrench member 32 moves toward the center of the tool housing 31 so that the third open groove 32a of the wrench member 32 is positioned within the second open groove 31a of the tool housing 31, and the lower end of the wrench member 32 can be fully housed within the slot 33 of the tool housing 31. Thus, when the second component is housed in the second open groove 31a of the tool housing 31, the spanner member 32 moves between an ungrip position and a grip position, allowing the third open groove 32a of the spanner member 32 to ungrip and grip the second component housed in the second open groove 31a. 【0077】 The spanner tool 15 may further include a spring 35 that biases the spanner member 32 to an ungrip position. This allows the spanner tool 15 to be maintained in the ungrip position by the spring 35 when stored and in standby, and the spanner member 32 to move from the ungrip position to the grip position only when a grip on the second component is needed, so that the spanner member 32 can accurately grip the second component. 【0078】 In one example, two springs 35 can be arranged symmetrically within a slot 33 of the tool housing 31, and the two springs 35 can be positioned to provide a spring force in a direction that pushes the wrench member 32 into an ungrip position. The wrench member 32 may have two retainer projections 32f that project upward independently from its upper end, and the lower end of each spring 35 can be individually supported by its corresponding retainer projection 32f. 【0079】 Referring to Figures 10 and 11, the wrench tool 15 may further include a stopper member 34 mounted on the tool housing 31. The stopper member 34 is configured to restrict the wrench member 32 to an ungrip position, thereby preventing the wrench member 32 from completely disengaging from the slot 33 of the tool housing 31. The wrench member 32 may have a guide groove 36, which may extend along the direction of movement of the wrench member 32, and a stopper surface 36a may be provided at the upper end of the guide groove 36. The stopper member 34 may have a stopper projection 38 that fits into the guide groove 36 of the wrench member 32, and the stopper projection 38 contacts the stopper surface 36a of the wrench member 32, thereby restricting the wrench member 32 to an ungrip position, thereby preventing the wrench member 32 from completely disengaging from the slot 33 of the tool housing 31. 【0080】 The stopper member 34 may have a mounting projection 34f, and the stopper projection 38 may protrude from the mounting projection 34f. The tool housing 31 may have a mounting hole 31f, which may communicate directly with the slot 33, and the guide groove 36 of the spanner member 32 may face the mounting hole 31f. As a result, when the mounting projection 34f of the stopper member 34 is fitted into the mounting hole 31f of the tool housing 31, the stopper projection 38 can be accurately accommodated on top of the guide groove 36 of the spanner member 32, and the stopper member 34 can be easily and accurately mounted into the tool housing 31 via the mounting projection 34f and the mounting hole 31f. 【0081】 Furthermore, by fastening one or more fasteners (screws) to the stopper member 34 and the tool housing 31, the stopper member 34 can be firmly attached to the tool housing 31. 【0082】 For example, the wrench member 32 may have two guide grooves 36, which may be arranged symmetrically on the wrench member 32, thereby allowing the wrench member 32 to have two stopper surfaces 36a. The stopper member 34 may have two mounting protrusions 34f, thereby allowing the stopper member 34 to have two stopper protrusions 38. The wrench member 32 can be stably supported by the stopper member 34 by the individual contact of the two stopper protrusions 38 with the two stopper surfaces 36a. The tool housing 31 may have two mounting holes 31f, which may be provided symmetrically on the tool housing 31. The two mounting holes 31f may communicate with a slot 33. Each mounting protrusion 34f of the stopper member 34 may be individually fitted into the corresponding mounting hole 31f of the tool housing 31. 【0083】 The power tool 10 may further include a first gripper 60 and a second gripper 70 positioned opposite each other on either side of the wrench head 11. The first gripper 60 may be adjacent to the first surface 41 of the wrench head 11, and the second gripper 70 may be adjacent to the second surface 42 of the wrench head 11. The first gripper 60 and the second gripper 70 may be positioned on the upper surface of the first bracket 21 of the bracket assembly 20. 【0084】 The first gripper 60 can be configured to selectively grip the outer surface of the spanner tool 15, thereby moving the spanner member 32 toward the center of the tool housing 31. Specifically, when the first gripper 60 grips the entire outer surface of the spanner tool 15, the spanner member 32 protruding from the outer surface of the tool housing 31 can be moved toward the center of the tool housing 31 by the gripping of the first gripper 60. 【0085】 Specifically, the first gripper 60 may include a first actuator 61, a pair of first grip members 62 configured to move by the first actuator 61, and a pair of first guide portions 63 provided individually on the upper part of the pair of first grip members 62. 【0086】 The first actuator 61 can be at least one of an electric actuator, a pneumatic actuator, or a hydraulic actuator. The first actuator 61 may include a first actuator housing 61a and a drive mechanism (not shown) provided within the first actuator housing 61a. The first actuator housing 61a can be fixed to the upper surface of the first bracket 21. The first actuator housing 61a may also have a guide groove 61b provided on its upper part, which may be configured to guide the movement of a pair of first grip members 62. 【0087】 A pair of first grip members 62 can be arranged facing each other so as to surround the outer circumferential surface of the spanner tool 15. Each first grip member 62 may have a semicircular grip groove 62a that matches half of the spanner tool 15, so that the grip grooves 62a of the pair of first grip members 62 can form a circle that matches the outer circumferential surface of the spanner tool 15. In addition, each first grip member 62 may have a guide projection 62b that protrudes toward the first actuator housing 61a, and the guide projection 62b of each first grip member 62 can move along the guide groove 61b of the first actuator housing 61a. 【0088】 The pair of first grip members 62 can be configured to move by the first actuator 61 between an ungrip position (see Figure 14) in which the outer surface of the spanner tool 15 is undrip'd and a grip position (see Figure 15) in which the outer surface of the spanner tool 15 is gripped. 【0089】 Referring to Figure 14, when the pair of first grip members 62 are in the ungrip position, the pair of first grip members 62 move away from each other, so that the grip grooves 62a of each first grip member 62 can be separated from the outer surface of the spanner tool 15, thereby allowing the pair of first grip members 62 to ungrip the outer surface of the spanner tool 15. When the pair of first grip members 62 ungrip the outer surface of the spanner tool 15, the spanner member 32 moves outward from the tool housing 31 due to the spring force of the spring 35, so that the spanner member 32 can move to the ungrip position. 【0090】 Referring to Figure 15, when the pair of first grip members 62 are in the grip position, the pair of first grip members 62 move closer to each other, so that the grip grooves 62a of each first grip member 62 can come into contact with the outer surface of the spanner tool 15, thereby allowing the pair of first grip members 620 to grip the outer surface of the spanner tool 15. When the pair of first grip members 62 grip the outer surface of the spanner tool 15, the spanner member 32 moves toward the center of the tool housing 31, thereby moving the spanner member 32 to the grip position. At this time, the spring 35 can be compressed by the spanner member 32. 【0091】 Each first guide portion 63 can be integrally provided with the upper end of the corresponding first grip member 62, and the first guide portion 63 may have a first tapered surface 63a that guides the second component to be gripped by the wrench member 32. This allows the second component to be precisely guided toward the wrench member 32 via the first tapered surface 63a of the first guide portion 63, thereby allowing the wrench member 32 to precisely grip the second component. 【0092】 Referring to Figures 1 and 3, each first guide portion 63 can extend from the upper end of the corresponding first grip member 62 to cover the upper part of the wrench head 11. In this way, by extending the first guide portion 63 from the upper end of the first grip member 62 to the upper part of the wrench head 11, the second component can be guided not only toward the spanner member 32 side, but the first component can also be guided toward the rotary socket 12 side. In particular, the area of ​​the first tapered surface 63a can be relatively increased, allowing for more accurate positioning of the first and second components. 【0093】 The first gripper 60 may further include a sensor 65 for determining whether the wrench member 32 has accurately gripped the second component. The sensor 65 can be incorporated within the first actuator housing 61a. In one example, the sensor 65 may be a current sensor, which can determine whether the wrench member 32 has accurately gripped the second component by sensing the current value output by the wrench member 32 gripping the second component as a pair of first grip members 62 grip the wrench tool 15. In another example, the sensor 65 may be a force sensor, which can determine whether the wrench member 32 has accurately gripped the second component by sensing the force output by the wrench member 32 gripping the second component as a pair of first grip members 962 grip the wrench tool 15. 【0094】 The second gripper 70 can be configured to grip and ungrip a third component adjacent to the first component gripped by the rotating socket 12 of the wrench head 11, and the third component can be located on the opposite side of the second component. That is, the second and third components can be positioned opposite each other with the first component in between. 【0095】 When the second gripper 70 grips the third component, the rotating socket 12 of the wrench head 11 can rotate the first component more accurately and stably. For example, as shown in Figure 16, the third component can be the outer tie rod 3b of the tie rod assembly 3 of the steering mechanism 1. This allows the rotating socket 12 of the wrench head 11 to rotate the lock nut 4 accurately when the second gripper 70 grips the outer tie rod 3b. 【0096】 Specifically, the second gripper 70 may include a second actuator 71, a pair of second grip members 72 configured to move by the second actuator 71, and a pair of second guide portions 73 provided separately on the upper part of the pair of second grip members 72. 【0097】 The second actuator 71 may be at least one of an electric actuator, a pneumatic actuator, or a hydraulic actuator. The second actuator 71 may include a second actuator housing 71a and a drive mechanism (not shown) provided within the second actuator housing 71a. The second actuator housing 71a may be mounted on the upper surface of the first bracket 21. The second actuator housing 71a may also have a guide groove 71b provided on its upper part, which may be configured to guide the movement of a pair of second grip members 72. 【0098】 A pair of second grip members 72 can be arranged facing each other so as to surround the outer surface of the third component. Each second grip member 72 may have a grip groove 72a corresponding to the outer surface of the third component, so that the grip grooves 72a of the pair of second grip members 72 can form a triangle to match the outer surface of the third component. In addition, each second grip member 72 may have a guide projection 72b projecting toward the second actuator housing 71a, and the guide projection 72b of each second grip member 72 can move along the guide groove 71b of the second actuator housing 71a. 【0099】 A pair of second grip members 72 can be configured to move by the second actuator 71 between an ungrip position (see solid line in Figure 18) where they uncrip the outer surface of the third component and a grip position (see dashed line in Figure 18) where they grip the outer surface of the third component. 【0100】 Referring to the solid lines in Figure 18, when the pair of second grip members 72 are in the ungrip position, the pair of second grip members 72 separate from each other, allowing each second grip member 72 to be separated from the outer surface of the third component, the outer tie rod 3b. This allows the pair of second grip members 72 to ungrip the outer surface of the third component, the outer tie rod 3b. 【0101】 Referring to the dashed line in Figure 18, when the pair of second grip members 72 are in the grip position, the pair of second grip members 72 move closer to each other, allowing the grip grooves 72a of each second grip member 72 to come into contact with the outer surface of the third component, the outer tie rod 3b, thereby enabling the pair of second grip members 72 to grip the outer surface of the outer tie rod 3b. 【0102】 Each second guide portion 73 can be integrally provided with the upper end of the corresponding second grip member 72, and the second guide portion 73 may have a second tapered surface 73a that guides the third component. This allows the third component to be precisely guided and positioned between the pair of second grip members 72 via the second tapered surface 73a of the second guide portion 73. 【0103】 Referring to Figures 16 and 17, the power tool 10 according to an embodiment of the present invention can be mounted on a robot 9 via a bracket assembly 20, and the power tool 10 can move closer to or further away from various work objects by the movement of the robot 9. 【0104】 Referring to Figures 16 to 20, the electric tool 10 according to an embodiment of the present invention can be a toe adjustment tool that adjusts and sets the toe of a vehicle by adjusting the length of the tie rod assembly 3 of the steering mechanism 1. 【0105】 The steering mechanism 1 may include a steering center link or steering rack and pinion 2 and a pair of tie rod assemblies 3 pivotably connected to both ends of the steering rack and pinion 2. Each tie rod assembly 3 may be configured to transmit force from the steering rack and pinion 2 to the knuckle of the vehicle wheel. 【0106】 Referring to Figure 16, each tie rod assembly 3 may include an inner tie rod 3a and an outer tie rod 3b. The inner tie rod 3a may have a male threaded portion 3c and a flat portion 5 adjacent to the male threaded portion 3c, the flat portion 5 may be a hexagonal portion having six flat surfaces. The outer tie rod 3b may have a female threaded portion 3d provided on its inner circumferential surface and a square projection 3f provided on its outer circumferential surface. The male threaded portion 3c of the inner tie rod 3a can be screwed into the female threaded portion 3d of the outer tie rod 3b. The overall length of each tie rod assembly can be adjusted by moving the male threaded portion 3c of the inner tie rod 3a along the axial direction of the female threaded portion 3d of the outer tie rod 3b. When the lock nut 4 is screwed onto the male threaded portion 3c of the inner tie rod 3a, and the lock nut 4 locks the male threaded portion 3c of the inner tie rod 3a and the female threaded portion 3d of the outer tie rod 3b, it is possible to prevent the male threaded portion 3c of the inner tie rod 3a and the female threaded portion 3d of the outer tie rod 3b from rotating relative to each other. That is, when the lock nut 4 is tightened, the male threaded portion 3c of the inner tie rod 3a and the female threaded portion 3d of the outer tie rod 3b can be locked, and when the lock nut 4 is loosened, the male threaded portion 3c of the inner tie rod 3a and the female threaded portion 3d of the outer tie rod 3b can be unlocked. The lock nut 4 may have a flat portion such as a hexagonal portion with six flat surfaces. By adjusting the length of each tie rod assembly 3, the toe of the vehicle can be adjusted and set. Specifically, after the lock nut 4 is loosened, the male threaded portion 3c of the inner tie rod 3a moves along the axial direction of the female threaded portion 3d of the outer tie rod 3b due to the rotation of the inner tie rod 3a, thereby adjusting the length of the tie rod assembly 3. When the lock nut 4 is tightened again, the adjusted length of the tie rod assembly 3 is set. 【0107】 When the pair of second grip members 72 are in the grip position, the grip grooves 72a of the second grip members 72 can grip the square projection 3f of the outer tie rod 3b. The grip grooves 72a of the pair of second grip members 72 grip the square projection 3f of the outer tie rod 3b, and rotation of the outer tie rod 3b can be prevented when the lock nut 4 is tightened or loosened. 【0108】 Figures 17 to 20 illustrate the process by which an electric tool 10 according to an embodiment of the present invention adjusts the length of the tie rod assembly 3. 【0109】 Referring to Figure 17, the electric tool 10 according to an embodiment of the present invention is approached by the robot 9 towards each tie rod assembly 3. When the rotating socket 12 of the wrench head 11 of the electric tool 10 accommodates the lock nut 4 of each tie rod assembly 3, the inner flat surfaces 12b, 12c, 12d, 12e of the rotating socket 12 are able to grip the lock nut 4. 【0110】 Referring to Figure 18, with the rotating socket 12 gripping the lock nut 4, the second gripper 70 grips the outer surface of the outer tie rod 3b, thereby preventing the outer tie rod 3b from rotating. In this state, when the rotating socket 12 rotates the lock nut 4 in the loosening direction, the lock nut 4 loosens, thereby unlocking the male threaded portion 3c of the inner tie rod 3a and the female threaded portion 3d of the outer tie rod 3b. 【0111】 Referring to Figure 19, when the rotating socket 12 accommodates the lock nut 4, the spanner tool 15 can accommodate the flat portion 5 of the inner tie rod 3a. Referring to Figure 20, when the first gripper 60 grips the spanner tool 15, the spanner member 32 of the spanner tool 15 can grip the flat portion 5 of the inner tie rod 3a. 【0112】 After the lock nut 4 is loosened, the second gripper 70 unclips from the outer surface of the inner tie rod 3a. Then, as the rotary socket 12 slowly rotates, the first gripper 60 grips the spanner tool 15, causing the first tapered surface 63a of the first guide portion 63 of the first gripper 60 to guide the flat portion 5 of the inner tie rod 3a. This allows the flat portion 5 of the inner tie rod 3a to be precisely positioned in the third open groove 32a of the spanner member 32 of the spanner tool 15. This allows the inner flat surfaces 32b and 32c of the spanner member 32 to precisely grip the flat portion 5 of the inner tie rod 3a. After the spanner member 32 grips the flat portion 5 of the inner tie rod 3a, the rotary socket 12 rotates clockwise or counterclockwise, allowing the male threaded portion 3c of the inner tie rod 3a to move along the axis of the female threaded portion 3d of the outer tie rod 3b, thereby adjusting the length of the tie rod assembly 3. 【0113】 After the length of the tie rod assembly 3 is adjusted, the first gripper 60 ungrips the spanner tool 15, causing the spanner member 32 of the spanner tool 15 to ungrip the flat portion 5 of the inner tie rod 3a. Subsequently, the rotating socket 12 rotates in the tightening direction, tightening the lock nut 4, thereby locking the male threaded portion 3c of the inner tie rod 3a and the female threaded portion 3d of the outer tie rod 3b. 【0114】 Figure 21 is a block diagram illustrating an automatic wheel alignment adjustment system 100 for a vehicle to which an electric tool 10 according to an embodiment of the present invention can be applied. 【0115】 Referring to Figure 21, the automatic wheel alignment adjustment system 100 may include a wheel alignment measuring device 110, a position measuring camera 120, a front wheel adjustment device 130, and a rear wheel adjustment device 140. 【0116】 The wheel alignment measuring equipment 110 can be configured to measure the wheel angle of a vehicle, the alignment of the vehicle's wheels, the alignment of toe and camber, etc., using contact sensors (such as contactors) or non-contact sensors (such as laser sensors). 【0117】 The position-measuring camera 120 can be configured to measure the positions of various components of the tie rod assembly 3 so that the power tool 10 is accurately positioned relative to the tie rod assembly 3. In particular, the position-measuring camera 120 accurately measures the position of the male threaded portion 3c of the inner tie rod 3a so that the spanner tool 15 can accurately grip the flat portion 5 of the inner tie rod 3a. 【0118】 The front wheel adjustment device 130 may include an electric tool 10, a front robot 9 to which the electric tool 10 is mounted, a front robot position adjustment unit 133 for adjusting the position of the front robot 9, and a front table 134 for supporting the front robot position adjustment unit 133. 【0119】 As described above, the power tool 10 can be configured to adjust the length of the tie rod assembly 3, and the front robot 9 can position the power tool 10 on the tie rod assembly 3 by various robotic motions. The front robot position adjustment unit 133 can adjust the position of the front robot 9 in a variety of ways in three axes using a three-dimensional Cartesian coordinate system. The front table 134 can be configured to support the front robot 9, and in particular, the front robot position adjustment unit 133 can move on the front table 134. If the power tool 10 malfunctions, the front robot 9 can move to the end of the front table 134 via the front robot position adjustment unit 133, allowing the operator to manually adjust the length of the tie rod assembly 3. 【0120】 The rear wheel adjustment device 140 may include a rear adjustment tool 141, a rear robot 142 to which the rear adjustment tool 141 is attached, a rear robot position adjustment unit 143 for adjusting the position of the rear robot 142, and a rear table 144 for supporting the rear robot position adjustment unit 143. 【0121】 The rear adjustment tool 141 can be configured to adjust the camber and toe of the rear wheels, and the rear robot 142 can position the rear adjustment tool 141 on the tie rod assembly of the rear wheel, etc., by various robotic motions. The rear robot position adjustment unit 143 can adjust the position of the rear robot 142 in various ways in three axes using a three-dimensional Cartesian coordinate system. The rear table 144 can be configured to support the rear robot 142, and in particular, the rear robot position adjustment unit 143 can move on the rear table 144. If the rear adjustment tool 141 fails, the rear robot 142 can move to the edge of the rear table 144 via the rear robot position adjustment unit 143, allowing an operator to manually adjust and set the camber and toe of the rear wheels. 【0122】 The above description is merely illustrative of the technical concept of the present invention, and any person with ordinary skill in the art to which the present invention belongs can make various modifications and alterations without departing from the essential characteristics of the present invention. 【0123】 Therefore, the embodiments disclosed herein are for illustrative purposes only, and not to limit the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments. The scope of protection of the present invention should be interpreted in accordance with the following claims, and all technical concepts within an equivalent scope should be interpreted as being included within the scope of the present invention. [Explanation of Symbols] 【0124】 1. Steering Mechanism 2. Steering rack and pinion 3 Tie rod assembly 3a Inner tie rod 3b Outer tie rod 3c Male threaded section 3D female thread 3f square protrusion 4 lock nuts 5 Flat area 9 Robots 10 Power Tools 11 Wrench head 12 Rotary Socket 12a 1st open groove 12b, 12c, 12d, 12e inner flat surface 13 Supporting Body 13a Mounting part 13b Mounting surface 15 Spanner Tools 20 Bracket Assembly 21 First bracket 21a slot 22 Second Bracket 22a Upper mounting part 22b Lower mounting section 23 Third bracket 31 Tool Housing 31a 2nd open groove 31b, 31c, 32b, 32c inner flat surface 31d, 32d Inner curved surface 31f mounting hole 32 Spanner parts 32a 3rd open groove 32f Retainer protrusion 33 slots 34 Stopper component 34f Mounting protrusion 35 springs 36 Guide grooves 36a Stopper surface 38 Stopper protrusion 41 First surface of the wrench head 42 Second side of the wrench head 51 Page 1 52 2nd page 60 First Grippa 61 First Actuator 61a First actuator housing 61b, 71b Guide grooves 62 First grip member 62a Grip groove 62b, 72b Guide projections 63. Section 1 Guide 63a First tapered surface 65 Sensors 70 Second Grippa 71 Second Actuator 71a Second actuator housing 72 Second grip member 73 Second guide section 73a Second tapered surface 110 Wheel alignment measurement equipment 120 Position measurement camera 130 Front Wheel Adjustment Tool 133 Front robot position adjustment unit 134 Front Table 140 Rear Wheel Adjustment Tool 141 Rear Adjustment Tool 142 Rear Robot 143 Rear robot position adjustment unit 144 Rear Table

Claims

[Claim 1] A wrench head including a rotatable rotary socket, A spanner tool that is detachably attached to the rotating socket via a plurality of fasteners, rotates in the same direction as the rotating socket, and whose axis of rotation is aligned with or eccentric to the axis of rotation of the rotating socket, The second gripper, and, The rotating socket is configured to grip and release the first component, which is the lock nut of the tie rod assembly of the steering mechanism. The spanner tool is configured to grip and release the second component, which is the flat portion of the inner tie rod of the tie rod assembly. The second gripper is configured to grip and ungrip the third component, which is the outer tie rod of the tie rod assembly. With the rotating socket gripping the first component, the second gripper grips the outer surface of the third component, and in this state, the rotating socket rotates the first component in the loosening direction. In this state, the wrench tool grips the second component, After the first component is loosened, the second gripper releases the outer surface of the inner tie rod, and then the rotating socket slowly rotates, and the spanner tool grips the flat portion of the inner tie rod, and the length of the tie rod assembly is adjusted as the rotating socket rotates clockwise or counterclockwise. An electric tool characterized in that, after the length of the tie rod assembly is adjusted, the spanner tool ungrips the flat portion of the inner tie rod, and then the first component is tightened by the rotation of the rotating socket in the tightening direction. [Claim 2] The rotating socket has a first open groove and a plurality of inner flat surfaces that define the first open groove. The electric tool according to claim 1, characterized in that the first component has a plurality of flat surfaces. [Claim 3] The electric tool according to claim 2, wherein the spanner tool includes a tool housing mounted on the rotary socket and a spanner member mounted in the tool housing so as to be movable between an ungrip position in which the second component is ungripned and a grip position in which the second component is gripped. [Claim 4] The power tool according to claim 3, characterized in that the tool housing has a second open groove, the spanner member has a third open groove, the second open groove is aligned with the first open groove, and the second open groove is relatively larger in size than the third open groove. [Claim 5] The power tool according to claim 3, characterized in that the tool housing has a slot in which the wrench member is movably housed, and the slot has a shape corresponding to the wrench member. [Claim 6] The electric tool according to claim 3, further comprising a spring that deflects the spanner member to the ungrip position. [Claim 7] The spanner tool further includes a stopper member that restricts the spanner member to the ungrip position, The electric tool according to claim 5, characterized in that the stopper member is mounted on the tool housing. [Claim 8] The electric tool according to claim 7, characterized in that the wrench member has a guide groove, the upper end of the guide groove has a stopper surface, and the stopper member has a stopper projection that is housed in the guide groove. [Claim 9] The power tool according to claim 8, characterized in that the stopper member has a mounting projection, the stopper projection protrudes from the mounting projection, the tool housing has a mounting hole into which the mounting projection of the stopper member connects, the mounting hole is connected to the slot, and the guide groove partially overlaps the mounting hole. [Claim 10] The electric tool further includes a first gripper configured to ungrip and grip the outer surface of the spanner tool, The power tool according to claim 3, characterized in that the wrench member moves to the ungrip position when the first gripper ungrips the outer surface of the wrench tool, and the wrench member moves to the grip position when the first gripper grips the outer surface of the wrench tool. [Claim 11] The first gripper includes a first actuator and a pair of first gripping members configured to move by the first actuator. The electric tool according to claim 10, characterized in that the pair of first grip members are configured to move between an ungrip position in which the outer surface of the spanner tool is undripped and a grip position in which the outer surface of the spanner tool is gripped. [Claim 12] The electric tool according to claim 11, characterized in that the pair of first grip members are arranged facing each other so as to surround the outer circumferential surface of the spanner tool. [Claim 13] The power tool according to claim 11, wherein the first gripper further includes a pair of first guide portions provided individually on the upper part of the pair of first grip members. [Claim 14] The power tool according to claim 13, characterized in that each first guide portion is integrally provided with the upper end of the corresponding first grip member, and the first guide portion has a first tapered surface that guides the second component gripped by the wrench member. [Claim 15] The power tool according to claim 14, characterized in that each of the first guide portions extends from the upper end of the corresponding first grip member to cover the upper part of the wrench head. [Claim 16] The power tool according to claim 1, characterized in that the second gripper includes a second actuator and a pair of second gripping members configured to move by the second actuator. [Claim 17] The electric tool according to claim 16, characterized in that the pair of second grip members are arranged facing each other so as to surround the outer surface of the third component. [Claim 18] The second gripper further includes a pair of second guide portions provided individually on the upper part of the pair of second grip members, The power tool according to claim 16, characterized in that each second guide portion is integrally provided with the upper end of the corresponding second grip member, and each second guide portion has a second tapered surface that guides the third component. [Claim 19] The wrench head further includes a supporting body, The electric tool according to claim 1, characterized in that the wrench head and the supporting body are attached to the arm of a robot via a bracket assembly.

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