Power Tools

Abstract

To provide an electric tool which is configured to easily achieve miniaturization, controls operation so as to easily perform work such as nail pulling, and thereby can improve handleability and ease of handling of a device.SOLUTION: An electric tool is used in work such as nail pulling. The electric tool 1 includes a body part 10, an engagement member 20 which is provided on the body part 10 side and has an engagement part 22 engaged with a part of a work object, a slide member 30 which is projectable into / withdrawable from the body part 10, and partially approaches and separates the engagement member 20, a drive source operating the slide member 30, and a control device for allowing the slide member 30 to perform predetermined operation by the drive source in response to a trigger signal input from the outside, wherein when the trigger signal is turned on, the slide member 30 is slid by a predetermined length.SELECTED DRAWING: Figure 16

Description

[Technical field]

[0001] The present invention relates to power tools. [Background technology]

[0002] At construction sites, for example, after concrete has been poured into a mold made of plates called concrete panels, nail removal may be required when separating the panels from the frame, and in such situations, mechanized power-type nail pullers such as air-operated, hydraulic-operated, and electric-operated nail pullers may be used.As conventional nail pullers used in such situations, many have been proposed that have a threaded hook for holding the nail, and are structured to move the hook up and down by transmitting the rotation of a motor to pull out the nail (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 5-5376 [Patent Document 2] Japanese Patent Application Publication No. 11-48161 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because the conventional power nail puller described above has a structure in which the hook is raised and lowered to pull out the nails, there is a need to secure a space (work area) within the housing that is large enough to raise and lower the hook, and there is a natural limit to how small the device can be. Various tools, such as power nail pullers, are designed to be held by workers to perform some task, such as pulling out nails, and by their very nature, if the housing is large, it is likely to affect the ease of handling for the worker, and this is particularly likely to affect the ease of handling for beginner users or users with relatively weak strength. Poor ease of handling means that the quality of ease of use and handling is likely to be evident in the case of a nail puller, such as difficulty in aiming at a nail or difficulty in hooking a nail on the hook, which may lower the evaluation of the tool itself in terms of its operability and performance.

[0005] Therefore, an object of the present invention is to provide an electric tool having a structure that can be easily miniaturized and whose operation can be controlled so that tasks such as pulling out nails can be easily performed, thereby improving the maneuverability and ease of use of the device. [Means for solving the problem]

[0006] One aspect of the present invention is a power tool used for tasks such as nail removal, A main body portion, An engagement member provided on the main body portion and having an engagement portion that engages with a part of a work target; a sliding member that moves in and out of the body portion to move a part of the sliding member toward and away from the engaging member; A drive source for operating the sliding member; a control device that causes a drive source to cause a sliding member to perform a predetermined operation in response to a trigger signal input from an external device; Equipped with This is an electric power tool that slides a sliding member a preset length when a trigger signal is turned on.

[0007] For example, in an electric power tool such as a nail puller, a sliding member provided so as to be able to retract from the main body of the tool slides to relatively separate the engaging member fixed to the main body from (the tip of) the sliding member. At this time, the contact member (i.e., the tip of the sliding member) that comes into contact with the board or frame material into which the nail is driven protrudes in the direction opposite to the nail pulling direction, so that the engaging member fixed to the main body moves relatively in the nail pulling direction, and the nail can be pulled out by this action. Moreover, this electric power tool is structured such that the engaging member and (the tip of) the sliding member can be relatively separated by sliding the sliding member outside the tool main body. In other words, the structure in which the sliding member slides outside the tool main body does not require the sliding stroke of the sliding member to be secured within the main body, and therefore, it can be said that the structure is easy to achieve a miniaturization of the device.

[0008] Moreover, from the viewpoint of the operability and ease of handling of an electric tool designed for a worker to hold in his / her hand to perform work such as pulling out nails, it is important that the tool is small and lightweight, and that the distance between the grip part held in the hand and the part on which, for example, a nail is hooked (the engaging part of the engaging member) is as close as possible. In this regard, with the electric tool as described above, it is possible to structure the grip part closer to the main body part, for example by arranging the motor on the vertical line of the sliding member (excluding the stroke range), and this makes it possible to improve the operability and ease of handling when performing work such as engaging the engaging part (such as a hook) with the work target (such as a nail).

[0009] In addition, the power tool of the above embodiment is configured so that the driving source causes the sliding member to perform a predetermined operation in response to a trigger signal input from the outside, and when the trigger signal is turned on, the sliding member can be slid a predetermined distance that has been set in advance. With a power tool whose operation is controlled in this way, it is easy to perform tasks such as pulling out nails.

[0010] The sliding member in the electric power tool of the above aspect may slide a predetermined length when the trigger signal is turned on, and may be stopped at that position.

[0011] The electric power tool of the above aspect may be configured to return the sliding member to the initial position when the trigger signal is turned off.

[0012] The electric power tool of the above embodiment may be configured such that, when a trigger signal is turned on, the sliding member is slid a preset length and returned to the initial position.

[0013] The initial position of the electric power tool having the above-described configuration may be a position in which the sliding member is most retracted into the main body.

[0014] The power tool of the above aspect may further include a sensor that detects whether the sliding member is in the initial position.

[0015] The electric power tool of the above aspect may be one in which the sliding length of the sliding member is controlled based on the amount of rotation of a motor serving as a drive source.

[0016] In the power tool of the above aspect, the amount of rotation of the motor may be preset in the control device.

[0017] In the electric power tool of the above aspect, a plurality of selectable operation modes may be set for operating the sliding member according to the type of work to be performed on the work object.

[0018] In the electric power tool of the above aspect, a clamping mode in which the entire or part of a work target is clamped between the engaging member and the sliding member may be set as one of the operation modes.

[0019] The electric power tool of the above embodiment may stop driving by the driving source under a predetermined condition in the clamp mode based on the load acting on the driving source and / or the sliding member. Effect of the Invention

[0020] The electric power tool of the present invention has a structure that makes it easy to reduce the size of the tool, and its operation is controlled so that tasks such as pulling out nails can be easily performed, thereby making it possible to improve the maneuverability and ease of use of the device. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a perspective view showing a state in which a rechargeable nail puller, which is an example of a power tool, is placed. [Diagram 2] 1 is a view (front view) of the rechargeable nail puller seen from one direction in an attitude (usage state) in which the hook member faces straight down. FIG. [Diagram 3] FIG. 3 is a right side view of the rechargeable nail puller shown in FIG. 2. [Figure 4] FIG. 4 is a top view of the rechargeable nail puller shown in FIG. 3. [Diagram 5] FIG. 4 is a bottom view of the rechargeable nail puller shown in FIG. 3. [Figure 6A] 6 is a cross-sectional view of the rechargeable nail puller taken along line VI-VI in FIG. 4. [Figure 6B] FIG. 6B is a diagram of the rechargeable nail puller in the same cross section as FIG. 6A with the slider slid. [Figure 7A] 1 is an oblique view of the rechargeable nail puller with the tip of the slider against a concrete panel. FIG. [Figure 7B] 7B is an enlarged view of the periphery of the tip of the slider in FIG. 7A. FIG. [Figure 8A] FIG. 7B is a perspective view of the rechargeable nail puller with the slider slid to the position shown in FIG. 7A. [Figure 8B] 8B is an enlarged view of the hook member and its periphery in FIG. 8A. FIG. [Figure 9A] 1 is a diagram showing the internal configuration of a mechanism, such as a hook member and a slider, as viewed from the front. [Figure 9B] 9B is a cross-sectional view of the hook member, the slider, the ball screw, etc. taken along line IXB-IXB in FIG. 9A. [Figure 10A] 13 is a side view of the hook member, slider, ball screw, etc. in a state where the slide member has been slid partway with the hook hooked on the nail. FIG. [Figure 10B] 10B is a vertical cross-sectional view of the hook member, the slider, the ball screw, etc. shown in FIG. 10A. [Figure 11] 1 is a perspective view of the hook member, slider, ball screw, etc., seen from below in a state in which the slider has been slid partway with the hook hooked on the nail. FIG. [Figure 12] FIG. 12 is a perspective view of the hook member, slider, ball screw, etc. in FIG. 11 (excluding the cover around the ball screw). [Figure 13] 13 is a perspective view showing a part of the hook member, slider, ball screw, etc. shown in FIG. 12. [Figure 14A] 14 is a perspective view showing a hook member and a main frame among the members shown in FIG. 13. FIG. [Figure 14B] FIG. 14 is a perspective view showing a slider and a ball screw among the members shown in FIG. [Figure 15] FIG. 1 is a diagram illustrating (A) a rechargeable nail puller according to an embodiment of the present invention and (B) a conventional rechargeable nail puller in order to explain miniaturization, which is one of the advantages of the present invention. [Figure 16] FIG. 1 is a diagram illustrating the miniaturization, which is one of the advantages of the present invention, showing (A) the rechargeable nail puller before the slider is slid and (B) the rechargeable nail puller after the slider has been slid. [Figure 17A] 1 is a front view of a hook member, a slider, etc., in a conventional nail puller with a hook hooked on a nail that has been driven in at an angle. [Figure 17B] FIG. 17B is a cross-sectional view of a hook member, a slider, etc., taken along line XVIIB-XVIIB in the conventional nail puller in FIG. 17A. [Figure 17C] FIG. 11 is a perspective view showing a hook member, a slider, etc., in a conventional nail puller in a state where the hook is hung on a nail that has been driven in at an angle. [Figure 18A]1 is a front view of a hook member, a slider, etc., in a conventional nail puller after the slider has been slid to remove a nail that was driven in obliquely. FIG. [Figure 18B] 18B is a cross-sectional view of a hook member, a slider, etc., taken along line XVIIIB-XVIIIB in the conventional nail puller in FIG. 18A. [Figure 19A] FIG. 11 is a vertical cross-sectional view illustrating a hook member in which a hook portion is disposed at a position offset from a drive shaft. [Figure 19B] 10 is a vertical cross-sectional view illustrating how a nail is pulled out by a hook member having a hook portion disposed at a position offset from a drive shaft. FIG. [Figure 20A] 1 is a perspective view showing a rechargeable nail puller with the tip of the slider against a concrete panel and without the cover. FIG. [Figure 20B] FIG. 20B is a perspective view of the rechargeable nail puller in a state where the slider is slid to the position shown in FIG. 20A. [Figure 21A] 13 is a perspective view showing a rechargeable nail puller in which the hook has been turned and the tip of the slider is aimed at a concrete panel. FIG. [Figure 21B] FIG. 21B is a perspective view of the rechargeable nail puller in a state where the slider is slid to the position shown in FIG. 21A. [Figure 22A] FIG. 1 is a perspective view of a rechargeable nail puller capable of changing the direction of the hook, as viewed from the tip end of the slider. [Figure 22B] FIG. 22B is a perspective view showing a state in which the orientation of the hook in the rechargeable nail puller shown in FIG. 22A is changed. [Figure 23A] FIG. 11 is a right side view showing the rechargeable nail puller with the tip of the slider against a concrete panel. [Figure 23B] FIG. 23B is a vertical sectional view of the rechargeable nail puller shown in FIG. 23A. [Figure 24A] FIG. 23B is a right side view showing the battery nail puller with the slider slid to the position shown in FIG. 23A. [Figure 24B] FIG. 24B is a vertical sectional view of the rechargeable nail puller shown in FIG. 24A. [Figure 24C] FIG. 2 is a vertical cross-sectional view of the rechargeable nail puller as viewed from the front. [Figure 25A] This is a diagram showing how the pointed part of the attachment is inserted between a concrete panel (plate material) and a crosspiece (frame material) and the part to be struck is struck with a hammer. [Figure 25B] This is an enlarged view of the attachment portion of the rechargeable nail puller with the pointed portion inserted between a concrete panel (board material) and a crosspiece (frame material). [Figure 25C] This is an enlarged vertical cross-sectional view showing an attachment portion of the rechargeable nail puller with its pointed portion inserted between a concrete panel (board material) and a crosspiece (frame material). [Figure 26] This is an oblique view showing the state in which the pointed part of the attachment is inserted between a concrete panel (plate material) and a crosspiece (frame material) and the part to be struck is struck with a hammer. [Figure 27A] This figure shows the state in which the pointed portion is inserted between a concrete panel (plate material) and a crosspiece (frame material) and then the slider is slid to separate the concrete panel and the crosspiece. [Figure 27B] FIG. 27B is a perspective view of the state shown in FIG. 27A as seen from a different angle. [Figure 27C] 27B is a diagram (side view) showing the state shown in FIG. 27A from still another angle. [Figure 28A] This is a side view showing how the nail foot of a nail that is stuck in a concrete panel is pushed down using a hook and a slider, thereby lifting the nail from the concrete panel. [Figure 28B] FIG. 28B is a diagram showing a vertical cross section of the rechargeable nail puller shown in FIG. 28A. [Figure 28C] This is a perspective view from a different angle showing how the foot of a nail that is stuck in a concrete panel (slab) is pushed down using a hook and slider, lifting the nail out of the concrete panel. [Figure 28D] FIG. 28D is an enlarged view of the rechargeable nail puller shown in FIG. 28C. [Figure 28E] These figures show, in order, (a) to (d), the process of using a hook and slider to push down the nail foot of a nail that is stuck in a concrete panel, lifting the nail out of the concrete panel, and then removing it. [Figure 29A]This is a perspective view showing how a frame material (batten) is clamped using the hook and slider of the rechargeable nail puller. [Figure 29B] This is a view from a different angle showing how the frame material (battens) is clamped using the hook and slider of the rechargeable nail puller. [Figure 30A] FIG. 1 is a perspective view showing, for reference, a portion of a conventional live nail puller in which a hook is disposed directly below a ball screw. [Figure 30B] FIG. 1 is a side view showing, for reference, a portion of a conventional live nail puller in which a hook is disposed directly below a ball screw. [Diagram 31] FIG. 2 is a block diagram showing a configuration example of a control device, an origin sensor, etc. [Figure 32A] FIG. 11 is a flowchart showing an operation flow of initial position detection (in the case of sensorless). [Figure 32B] FIG. 13 is a diagram showing an outline of the operation (pattern 1) of initial position detection (in the case of sensorless). [Figure 32C] FIG. 13 is a diagram showing an outline of the operation (pattern 2) of initial position detection (in the case of sensorless). [Fig. 32D] FIG. 13 is a diagram showing an outline of the operation (pattern 3) of initial position detection (in the case of sensorless). [Figure 33A] FIG. 11 is a flowchart showing an operation flow of initial position detection (when a sensor is present). [Figure 33B] FIG. 13 is a diagram showing an outline of an operation (pattern 1) of initial position detection (with a sensor). [Figure 33C] FIG. 13 is a diagram showing an outline of the operation (pattern 2) of initial position detection (with a sensor). [Figure 33D] FIG. 13 is a diagram showing an outline of an operation (pattern 3) of initial position detection (with a sensor). [Diagram 34] FIG. 13 is a flow chart of a portion of the nail puller operation flow corresponding to a "nail puller mode." [Diagram 35] FIG. 13 is a flow chart showing a portion of the nail puller operation flow corresponding to a "nail puller one cycle mode." [Figure 36A]FIG. 13 is a flow chart of the nail puller + clamp operation flow corresponding to the "nail puller mode." [Figure 36B] FIG. 13 is a flow chart of the nail puller + clamp operation flow corresponding to the "nail puller one cycle mode." [Figure 36C] FIG. 13 is a flow chart of the nail puller + clamp operation flow corresponding to the "clamp mode." [Figure 37] 11 is a graph showing an example of a current waveform during reverse driving in a clamp mode. [Figure 38A] FIG. 11 is a flowchart showing a part of the operation flow of nail puller+initial position detection+clamping that corresponds to the "nail puller mode." [Figure 38B] FIG. 13 is a flow chart of the nail pulling + initial position detection + clamping operation flow corresponding to the "nail pulling one cycle mode." [Figure 38C] FIG. 11 is a flow chart of the nail puller + initial position detection + clamp operation flow corresponding to the "clamp mode." DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a power tool according to the present invention will be described with reference to the drawings.

[0023] [First embodiment] As a first embodiment of the present invention, a case where a power tool is used as a rechargeable nail puller will be described (see FIG. 1, etc.). The rechargeable nail puller 1 is a type of rechargeable power tool used for nail pulling work such as pulling out a nail P that has penetrated a board material or frame material such as a concrete panel Q or a crosspiece R. The rechargeable nail puller 1 of this embodiment is a tool including a main body 10, a hook member 20, a slider 30, a cover 50, a motor 60, etc. (see FIGS. 1 to 19B, etc.), and is configured such that the hook member 20 fixed to the main body 10 is hooked on a nail head Ph, and in this state, the slider 30 is projected from the main body 10 along the drive shaft DA, and the nail is pulled out in accordance with the movement of the slider 30 (see FIG. 19B, etc.). Below, the configuration of the rechargeable nail puller 1 will be described first, and then the operation of the rechargeable nail puller 1 will be described.

[0024] The main body 10 is a part that constitutes the main body of the rechargeable nail puller 1, and in this specification it particularly refers to the part excluding the driving part (slider 30, etc.). The main body 10 in this embodiment is mainly composed of a mechanism part 11 that houses the motor 60, etc., a grip part 12 that is held by a user U (only the hand holding the rechargeable nail puller 1 is shown in Figs. 7A and 8A) during use, and a battery housing part 13 that houses the battery 66, etc. (see Figs. 3 to 5, etc.).

[0025] The mechanical section 11 is a section that houses the motor 60 and a drive mechanism (e.g., a reducer 71, a screw shaft 72, etc., described later) 70 for transmitting the driving force of the motor 60 to the slider 30 (see FIG. 6B, etc.). The mechanical section 11 is further provided with a main frame 14, a cover 50, a hook member 20, etc. (see FIG. 6A, etc.).

[0026] The grip section 12 is formed in a shape that connects the battery storage section 13, which is relatively bulky, and the mechanism section 11, except for the extension line of the drive shaft DA, and is configured as a whole so that when a user holds the grip section 12 to lift and operate the rechargeable nail puller 1, the weight balance is good and it is easy to handle (see Figs. 4, 5, etc.). The grip section 12 in this embodiment is formed to extend in a direction perpendicular to the drive shaft DA, but it may be formed to extend in a slightly oblique direction in consideration of ease of nail pulling work, etc. A trigger switch 122 that can be operated by a finger is provided on the part of the grip section 12 near the mechanism section 11 (see Fig. 3, etc.). Although a detailed description will not be given here, the grip section 12 is formed in a shape and size that is easy to grip, and a treatment is applied to make it less slippery and easier to grip, such as arranging a flexible member on the surface.

[0027] The battery storage section 13 is a section for storing a rechargeable battery 66 and the like, and is also a section of the main body 10 that is likely to be heavy. In this embodiment, the battery storage section 13 is configured as a housing having a substantially rectangular parallelepiped shape, and has a shape and size that can easily accommodate a large battery 66 (see FIG. 6A, etc.). According to the rechargeable nail puller 1 of this embodiment, which has the rechargeable battery 66 built in, it is possible to perform nail pulling work in a cordless state as a cordless hand tool. In addition, the surface of the battery storage section 13 opposite to the grip section 12 is flat, and a rubber pad (not shown) or the like is attached as necessary, and is configured to become a placement surface 13S when the battery storage section 13 is placed in a stable position (placed state) on the ground or floor surface when not in use (see FIG. 1, FIG. 3, etc.). The battery storage section 13 of this embodiment is further provided with a strap 132 and a belt hook 134 (see FIG. 2, etc.).

[0028] Here, the relationship between the description in the drawings and the attitude of the rechargeable nail puller 1 will be mentioned. The attitude (orientation of the rechargeable nail puller 1) when the rechargeable nail puller 1 of this embodiment is actually used for nail pulling work (in-use state) is not particularly limited. For example, if a nail P that has penetrated a wall surface is to be pulled out horizontally, the hook member 20 and the slider 30 (described in detail later) can be used in a horizontal position as in the placed state, and if a nail P that has penetrated a ceiling is to be pulled out directly downward, the hook member 20 and the slider 30 can be used in a position facing directly upward. However, in light of the actual situation of use, it is assumed that the action of pulling out the nail P of a board material or frame material such as a concrete panel Q or a crosspiece R placed at the foot is normally performed directly upward. In this specification and drawings, assuming such a normal situation, the mode in which the hook member 20 and the slider 30 are used in a state facing downward will be referred to as the "use state" as a representative example of a typical use (see FIG. 2, etc.). Also, for convenience, the upper side in the usage state (the direction upward along the drive axis DA) will be called the top, the lower side will be called the bottom, the side where the mechanism unit 11 is located as seen from the user's perspective will be called the front, and the side where the battery storage unit 13 is located will be called the rear (see Figure 7A, etc.).

[0029] The hook member 20 functions as a member that engages with a part of the work target (in this embodiment, the head (nail head Ph) of the nail P to be pulled out from a batten, etc.), and has a hook (engagement portion) 22 formed at its tip. The shape of the hook 22 is not particularly limited as long as it can engage with the nail head Ph. In this embodiment, the hook 22 is formed by a pair of symmetrical claws that gradually narrow in width toward the front when viewed from below, like the tip of a normal nail puller (crowbar) (see FIG. 5, etc.). Also, if the hook 22 has a wedge shape that gradually becomes thinner toward the front when viewed from the side (the left-right direction perpendicular to the front-back direction in use), it is easy to hook it onto the nail head Ph (see FIG. 6B, etc.). The hook member 20 on which the hook 22 is formed is fixed to the main frame 14 of the mechanism unit 11 (see FIG. 11, etc.). In this embodiment, the hook member 20 is formed in a cylindrical shape (see Figure 14A, etc.) and also functions as a guide member that guides the rod portion 32 (which will be described later) of the slider 30 that slides in the vertical direction (see Figure 13, etc.).

[0030] The main frame 14 is a frame formed in the mechanism section 11 of the main body section 10 so as to extend in the up-down direction (direction from top to bottom) along the drive shaft DA (see FIG. 12, etc.). In this embodiment, a pair of left and right plate-like members arranged symmetrically on either side of the drive shaft DA is used as the main frame 14 (see FIG. 9A, FIG. 9B, etc.). The upper end of the main frame 14 is attached and fixed to the frame base 15 (see FIG. 13, etc.). The hook member 20 is screwed to the tip portion (lower portion) of the main frame 14 from both sides, for example, with fastening screws 24 (see FIG. 14A, etc.). The hook member 20 fixed to the main frame 14 does not change its relative position in the up-down direction (direction along the drive shaft DA) in the mechanism section 11. The main frame 14 not only plays a role of holding the hook member 20 fixed in this way, but also plays a role of a guide member that guides the slider 30 that slides in the up-down direction.

[0031] The slider (sliding member) 30 is a movable member that slides up and down to appear and disappear from the main body 10, and moves a part of it (tip 31) relatively close to and away from the hook 22 of the hook member 20, so to speak, functioning like a leg (pusher or push rod). By projecting the slider 30 with the hook 22 of the hook member 20 engaged with the nail head Ph, the hook 22 of the hook member 20 fixed to the main body 10 side and the tip 31 of the slider 30 are relatively separated, and the nail P can be pulled out with this movement (see Fig. 7B, Fig. 8B, etc.). The slider 30 of the rechargeable nail puller 1 of this embodiment configured in this way can be said to function like a tension rod when pushing up the main body 10 together with the hook 22 against the nailed concrete panel Q or crosspiece R (see Fig. 16, etc.).

[0032] The specific configuration of the slider 30 is not particularly limited as long as it can function as described above, but in the present embodiment, which is a preferred example, the slider 30 is configured to have a tip portion 31, a rod portion 32, and a side cover portion 33 that slide vertically along the main frame 14 provided on the body portion 10 (see FIG. 14B, etc.). The driving force of the motor 60 is transmitted to the slider 30 via a driving mechanism 70 including a screw shaft 72, and the slider 30 moves linearly along the driving axis DA.

[0033] The tip portion 31 is formed at the bottom of the slider 30 and is, for example, a substantially circular plate-like member, which comes into contact with a concrete panel Q, a crosspiece R, etc., to serve as a bracing portion that relatively pushes up the main body portion 10 (see Figures 7A, 8A, etc.).

[0034] The rod portion 32 is made of a rod-shaped member extending along the drive axis DA, and is integrated with the tip portion 31 at its lower tip (see FIG. 14B, etc.). The rod portion 32 is cylindrical so that the screw shaft 72 passes through its inside (see FIG. 6A, etc.). In addition, a sleeve portion 32c having a female screw 32b that screws with the screw shaft 72 is provided on the inner periphery of a part of the rod portion 32, for example, the upper flange portion 32a, so that the rod portion 32 and the entire slider 30 move linearly along the drive axis DA as the screw shaft 72 rotates (see FIG. 6B, etc.). The screw shaft 72, the female screw 32b, and the steel ball (not shown) interposed between the screw shaft 72 and the female screw 32b constitute a drive mechanism 70 for linearly moving the slider 30, for example, a ball screw (indicated by the symbol 73 in FIG. 9A, etc.) as in this embodiment. The rod portion 32 is formed so that its outer diameter is smaller than the inner diameter of the hook member 20, is disposed inside the hook member 20, and is guided by the inner peripheral surface of the hook member 20 when sliding (linearly moving) (see Figs. 10B, 13, etc.). The rod portion 32 is integrated with the side cover portion 33 at its lower end portion by fastening with a screw (such as a flat head cap bolt) 39 (see Figs. 10B, 11, etc.).

[0035] The side cover portion 33 is made of a member that constitutes the peripheral portion of the slider 30 (see FIG. 14B, etc.). In this embodiment, the side cover portion 33 is provided so as to surround the main frame 14, and further, both side portions of the side cover portion 33 are formed so that their cross-sectional shape is a channel shape, and the main frame 14 is sandwiched in the groove portion (see FIG. 9A, FIG. 9B, etc.). The side cover portion 33 thus formed slides (linearly moves) along the drive axis DA together with the tip portion 31 and the rod portion 32 while being guided by the main frame 14 (see FIG. 12, etc.). A cover 50 is provided around the side cover portion 33.

[0036] The cover 50 is a cylindrical member provided on the mechanism unit 11 so as to cover the periphery of the side cover portion 33 (see FIG. 6A, etc.). The cover 50 of this embodiment is provided so as to cover a portion of the slider 30 except for the tip portion 31 when the slider 30 is in a retracted state (initial position) housed in the main body unit 10 (see FIG. 7B, etc.).

[0037] The motor 60 is provided as a power source for driving (linearly moving) the slider 30, which is a movable part, via the drive mechanism 70. The motor 60 in this embodiment is provided in the main body 10 at an upper position within the mechanism part 11 (see FIG. 6A, etc.).

[0038] The drive mechanism 70 is a mechanism configured to transmit the power of the motor 60 to drive (linearly move) the slider 30, which is a movable part. The drive mechanism 70 of this embodiment includes a reducer 71 and a ball screw 73 (see FIG. 6A and the like). Although not shown in detail, the reducer 71 includes a gear train that appropriately reduces the rotation speed of the motor 60 and transmits the rotation speed to the screw shaft 72 of the ball screw 73. The screw shaft 72 is provided along the drive axis DA, and rotates to drive (linearly move) the slider 30.

[0039] The control device (control section) 90 is built into the main body section 10 as a device for controlling the motor 60. The control device 90 in this embodiment is connected to the motor 60 for two-way communication so as to be able to send and receive control signals, and is also connected to the origin sensor 80, the trigger switch 122, the mode operation / display section 92, and the battery storage section 13 (the battery 66 stored therein) (see FIG. 31). In addition, although not shown in the figure, the control device 90 is equipped with a communication circuit, a converter circuit, an inverter circuit, an MPU for controlling the communication circuit, and the like for communicating with these.

[0040] As described above, in this embodiment, the screw shaft 72 is provided along the drive axis DA, and the reducer 71 is provided above the screw shaft 72 at a position that is an extension of the drive axis DA. Furthermore, the motor 60 is provided above the reducer 71 at a position that is an extension of the drive axis DA (see FIG. 6A, etc.). As a result, in the charged nail puller 1 of this embodiment, the motor 60 and the drive mechanism 70 (the reducer 71, the ball screw 73 and its screw shaft 72) are configured to be coaxially arranged in series. This configuration, combined with the configuration that enables the overall height of the charged nail puller 1 to be reduced, contributes to improving the ease of handling and aiming.

[0041] That is, firstly, in the rechargeable nail puller 1 of the present embodiment in which the hook member 20 is fixed instead of being stroked as in the past, and the hook member 20 is moved relatively by stroking the slider 30 instead, there is no need to secure a space inside the main body 10 for stroking the hook member 20. With such a configuration, it is possible to lower the overall height (the length of the mechanism 11 along the drive shaft DA) of the rechargeable nail puller 1 in the usage state (however, in the retracted state in which the slider 30 is retracted into the main body 10 and in the initial position) by the length L1 (almost equal to the stroke amount of the hook member 20) corresponding to the internal space required for the stroke of the hook member that should have been secured inside the main body 10, that is, to reduce the overall height (see Figs. 15 and 16, etc. In Fig. 15(B), the reference symbol 1' is used to indicate a conventional rechargeable nail puller). The height of the mechanism 11 in the initial position (retracted state) (the length from the tip 31 to the top of the mechanism 11 along the drive axis DA) is indicated by the symbol L2 (see FIG. 16).

[0042] Secondly, by making it possible to reduce the overall height as described above, it is easy to arrange the motor 60 on the drive shaft DA (or on its extension). For example, the motor 60, which had to be offset and arranged inside the hand grip 12 to avoid an excessively high overall height, can be arranged on the drive shaft DA (or on its extension) in the present embodiment, which realizes a low overall height. In such a case, it is possible to configure the hand grip 12 closer to the mechanism 11 and the hook 22. If the hand grip 12 is closer to the mechanism 11 and the hook 22 in this way, it contributes to making it easier to handle and aim in the actual nail pulling work, especially to making it easier to hook the hook 22 on the nail head Ph. Moreover, the force acting on the screw shaft 72 acts directly below (coaxially) the screw shaft 72 regardless of the position of the nail P or the direction in which it is inserted, so there is no need to arrange the hook 22 directly below the drive shaft DA, which also contributes to solving the problem of "it is difficult to aim the nail."

[0043] In addition, arranging the motor 60, the reducer 71, and the screw shaft 72 close to each other on a straight line makes it possible to omit the conventional power transmission mechanism (such as a bevel gear) arranged between them, thereby making the structure simpler and contributing to miniaturization and weight reduction. In addition, such a battery-powered nail puller 1 is conveniently easy to use even in narrow spaces.

[0044] Furthermore, when using a nail puller tool that strikes the nail foot Pt to pull out the nail P, the force of the strike can cause the pulled-out nail P to scatter; however, with the rechargeable nail puller 1 of this embodiment as described above, it is possible to pull out the nail without the nail P being scattered.

[0045] Also, in the case of a structure in which the main body 10 itself strokes and moves in association with the nail pulling operation (that is, moves together with the hook 22 to move away from the concrete panel Q or the crosspiece R) like the rechargeable nail puller 1 of this embodiment (see Figs. 7A to 8B, etc.), there is an advantage that it is easy for the user to experience the nail pulling. That is, in a conventional structure in which the hook slides inside the main body, a user who works while holding the rechargeable nail puller in his or her hand can only confirm the nail pulling operation by seeing it with his or her eyes or hearing the operation sound with his or her ears, whereas with the rechargeable nail puller 1 of this embodiment, the user can directly feel the movement of the main body 10 itself stroking (rising) in association with the nail pulling operation, and can easily realize that the nail pulling operation has been performed and completed.

[0046] [Second embodiment] As a second embodiment of the present invention, further features of the hook member 20 and the hook 22 of the live nail puller 1 will be described. Note that the description of other configurations of the live nail puller 1 that are common to those in the first embodiment will not be repeated.

[0047] <Structure that suppresses the effects of unbalanced load> In constructing the rechargeable nail puller 1 as described above, it is preferable to take into consideration the problem of "biased load" acting on the drive shaft. In the case of a conventional structure in which the nail P is pulled out by moving the hook 22', if the nail P penetrates straight into the concrete panel Q or the crosspiece R, the force acting on the drive shaft when the nail P is pulled out acts only in the axial direction, so no biased load (biased load) acts (see Figures 17A and 17B). However, in reality, the nail P often penetrates obliquely (see Figure 17C), and when the nail P is pulled out, the nail pull-out resistance occurs at a position shifted from the drive shaft, which causes a lateral load to act on the drive shaft as an biased load (see Figures 18A and 18B). That is, the resistance when the nail is pulled out occurs at the frictional resistance portion between the nail P and the concrete panel Q or batten R as the driving member, more specifically, the portion of the nail P that penetrates the batten R (the portion with fine dots in FIG. 18B). Therefore, the reason why the offset load acts on the nail P that is driven in obliquely as described above can be explained as the reason that the portion that generates such resistance (the portion of the nail P that penetrates) is misaligned (offset) with respect to the drive shaft. When the offset load acts, the screw shaft 72' is inclined, and as the amount of the nail P pulled out increases, the inclination also increases. As a result, the load acting on the bearing portion of the screw shaft 72' causes uneven wear, and durability may decrease. In this way, the offset load occurs due to the misalignment between the drive shaft and the nail, and this may be even more likely if the hook 22 is disposed at a position offset from the drive shaft DA as in this embodiment. Considering the problem of such uneven load, one possible configuration to suppress or eliminate its effects as much as possible is to prevent uneven load from occurring by locating the hook position for hooking the nail head on the drive shaft in the conventional mechanism. However, although this arrangement of the conventional mechanism is effective in improving durability, it has the disadvantage that it is difficult to see (aim) the tip of the nail. In addition, it cannot avoid the uneven load that occurs when removing a nail that has penetrated at an angle. In this regard, the present embodiment, which has been made by comprehensively taking into consideration various issues, employs a rigid structure that makes it easy to see (aim) the tip of the nail and is also less susceptible to the effects of unbalanced loads. That is, the hook, which is subjected to an unbalanced load in a diagonal or lateral direction, is supported by the main frame 14 having high rigidity, not by a screw shaft for generating a driving force. Also, a guide member is provided to guide the sliding of the slider 30, which is the movable part, to prevent an unbalanced load from acting on the female thread 32b. This eliminates the need to provide the hook 22 directly below (on an extension of) the drive shaft DA, which allows the position of the hook 22 to be offset, thereby solving the problem of "it being difficult to aim the nail."

[0048] <Offset hook placement> The hook 22 of the hook member 20 is disposed at a position offset from the drive shaft DA (see FIG. 10A, etc.). The hook 22 of the hook member 20 of this embodiment is formed so as to protrude in a direction perpendicular to the drive shaft DA, and faces horizontally when in use (see FIG. 6A, etc.). Also, the hook 22 is provided so that at least a part of it is outside the cover 50 and can be seen (see FIG. 5, etc.). The advantages of the above-mentioned configuration are as follows. That is, some conventional charging nail pullers have the hook 22' disposed in a position directly below the screw shaft 72' of a ball screw or the like (in other words, on an extension of the drive shaft DA) (see FIG. 30A, FIG. 30B). However, this makes it difficult to see the hook 22' and to grasp its position, which can make it difficult to perform the task of hanging the hook 22' on the nail head Ph. In this regard, according to the rechargeable nail puller 1 in which the hook 22 is offset as in this embodiment, since the hook 22 is offset from the drive shaft DA, the user can easily see the hook 22 and can easily perform the task of hanging the hook 22 on the nail head Ph (see Figures 7A, 7B, etc.).

[0049] <Protruding leg at the tip of the slider> In this embodiment, since the hook 22 is offset as described above, the slider 30, particularly the tip portion 31 thereof, has a structure suitable for the offset arrangement of the hook 22. That is, (1) The tip 31 of the slider 30 is provided with a protruding leg 35 that protrudes in a direction perpendicular to the drive shaft DA (see FIG. 10A, etc.). The protruding leg 35 is formed to a size and shape sufficient to eliminate the effect of an external force (moment) that may act when the nail P is pulled out by the offset-positioned hook 22. As a preferred example, in this embodiment, a pair of protruding legs 35 that are sufficiently protruding compared to the hook 22 (see FIG. 19A, etc.) and are symmetrically arranged on the left and right are provided on the tip 31 (see FIG. 5, etc.). The length from the drive shaft DA to the tip of the hook 22 is L4, and the protruding leg 35 is further forward by a length L5 (see FIG. 19B). The pair of protruding legs 35 are arranged at a wider interval than the hook 22 so that the hook 22 of the hook member 20 can be positioned between them (see FIG. 7B, etc.). (2) The tip 31 of the slider 30 is formed with a flat surface 31f that comes into contact with the concrete panel Q, the crosspiece R, etc. (see FIG. 19A, etc.). This flat surface 31f is at least large enough or shaped to eliminate the effect of an external force (moment) that may act when the nail P is pulled out by the offset hook 22. In this embodiment, the flat surface 31f is formed to extend further forward beyond the offset amount Los of the hook 22 (which in this specification refers to the distance between the imaginary center axis Pc and the drive axis DA when the nail P hung on the hook 22 is assumed to be straight) (in other words, the length L3 from the drive axis DA to the front end of the flat surface 31f is sufficiently longer than the offset amount Los), thereby widening the contact area (ground area) with the concrete panel Q, the crosspiece R, etc. (see FIG. 19B, etc.). It goes without saying that the lower surface of the above-mentioned protruding leg 35 may be entirely or mostly flat.

[0050] <Rotating structure such as hooks> In the case where the hook 22 is offset and protrudes in a direction perpendicular to the drive shaft DA as described above, it is preferable to make the hook 22 rotatable (pivotable) around the drive shaft DA. This reduces the constraints on the operation of the rechargeable nail puller 1, such as the case where the hook 22 always faces one direction, and makes it possible to further improve ease of use (see Figs. 20A, 20B, etc.). In this embodiment, the rotatable part 21 and the O-ring 26 are provided at the lower tip of the hook member 20, and the orientation of the hook 22 formed on the rotatable part 21 can be changed (see Figs. 21A, 21B, 22A, etc.). The specific configuration of the rotatable part 21 is not particularly limited. As an example, in this embodiment, a ring-shaped rotatable portion 21 having a larger diameter than the cylindrical portion 23 is provided at the lower tip portion of the cylindrical portion (indicated by the symbol 23) of the hook member 20, and the orientation of the hook 22 can be changed by manually rotating this rotatable portion 21 around the drive axis DA (see Figures 22A, 23B, etc.).

[0051] The O-ring 26 is an annular member made of, for example, rubber, provided between the rotatable part 21 and the cylindrical part 23 (see FIG. 23B, etc.). The O-ring 26 functions as a resistor that imparts a predetermined resistance to the rotational movement of the rotatable part 21 about the drive shaft DA, and while allowing the relative rotation of the rotatable part 21, prevents the rotatable part 21 from accidentally rotating after the orientation of the hook 22 is changed.

[0052] In the rechargeable nail puller 1 of this embodiment, not only the hook 22 but also the direction of the protruding leg 35 of the slider 30 is configured to be changeable. For example, in this embodiment, the rod portion 32 and the tip portion 31 of the slider 30 are separated, and a rotatable portion 34 that enables relative rotation therebetween and an O-ring 38 are provided, so that the tip portion 31, the side cover portion 33 and the protruding leg 35 can rotate (pivot) integrally relative to the rod portion 32 (see FIG. 24B, etc.). The rotatable portion 34 can be configured, for example, by a screw that rotatably attaches the tip portion 31 to the lower end of the rod portion 32 (see FIG. 24B, etc.).

[0053] The O-ring 38 is an annular member made of, for example, rubber, provided between the rod portion 32 and the tip portion 31 (see FIG. 24B, etc.). This O-ring 38 functions as a resistor that imparts a predetermined resistance to the rotational movement of the tip portion 31 and the like about the drive axis DA, and while allowing the tip portion 31 and the like to rotate relative to each other, it prevents the protruding leg portion 35 and the tip portion 31 from accidentally rotating after the orientation of the protruding leg portion 35 is changed.

[0054] In this embodiment, the protruding leg 35 and the hook 22 are formed so that they at least partially overlap with each other in the axial direction of the drive shaft DA when the slider 30 is in the initial position retracted into the main body 10 (see FIG. 23B, etc.). In other words, if the protruding leg 35 is rotated in the retracted state (initial position), it will interfere with the hook 22 during the rotation. Therefore, in the rechargeable nail puller 1 of this embodiment, if the protruding leg 35 is rotated in the retracted state (initial position), the hook 22 can be rotated the same amount. For example, if it is desired to change the direction of the hook 22 according to the position or state of the nail P, it is easy to do so by rotating the protruding leg 35 on the outside, since the direction can be changed simultaneously with the hook 22 (see FIG. 22A, FIG. 22B, etc.). In addition, the fact that the protruding leg 35 and the hook 22 always face in the same direction also means that the protruding leg 35 is always located directly below the hook 22 when the nail P is pulled out (see FIG. 24A, FIG. 24B, etc.). Therefore, no matter in which direction the hook 22 is oriented, the external force (moment) that may act when pulling out the nail P with the offset-positioned hook 22 is received by the protruding leg 35 directly below, and the effect of this force can be eliminated.

[0055] <Structure that returns the hook and protruding leg to their original orientation> Furthermore, in this embodiment, even if the orientation of the hook 22 and the protruding leg 35 is changed to perform a nail removal operation, a mechanism is in place to return the orientation of the hook 22 and the protruding leg 35 to their original orientation (facing forward in this embodiment) after the operation (see Figs. 22A, 23A, etc.). Such a mechanism can be configured, for example, as a device including a guide member that rotates the slider 30 and the rotatable part 21 of the hook member 20 by a predetermined amount so that the hook 22 and the protruding leg 35 face forward while guiding the slider 30 and the rotatable part 21 of the hook member 20 during the period from the state in which the slider 30 most protrudes from the main body part 10 and removes the nail P (protruding state) (see Figs. 24B, 24C, etc.) to the initial position in which the slider 30 is in the retracted state (see Fig. 23B, etc.) (for example, a device that includes a combination of a spiral guide and a protrusion guided along the guide, and that determines the circumferential position of the protruding leg 35 of the slider 30 and the rotatable part 21 of the hook member 20 with the pulling-up sliding operation when the slider 30 returns to the initial position).

[0056] <Structure for clamping components> The main purpose of the rechargeable nail puller 1 equipped with the hook 22 and the protruding leg 35 as described above is, of course, to pull nails, but it can also be used as a clamping device for clamping a member arranged perpendicular to the drive shaft DA. For example, when two concrete panels Q are brought together by clamping the crosspieces of the concrete panels Q together so that the concrete panels Q are in contact with each other without any gaps, the crosspieces R can be sandwiched between the lower surface of the hook 22 and the upper surface of the protruding leg 35 (see Figs. 29A and 29B). When used for such purposes, the hook 22 and the protruding leg 35 can be said to function as a holding part that holds the member to be clamped and holds it in that state.

[0057] The rechargeable nail puller 1 of this embodiment is a single power tool that can be used in practical applications other than nail pulling. This makes it possible to meet the potential demands of on-site workers, who tend to think that it is costly and difficult to have different tools for each task.

[0058] [Third embodiment] As a third embodiment of the present invention, a rechargeable nail puller 1 that further improves convenience by enabling it to be used for dismantling concrete panels Q, crosspieces R, etc. In this rechargeable nail puller 1, a tapered pointed portion is formed on a part of the slider 30, and by striking the slider 30 with a hammer or the like to drive the pointed portion in, separation work of plate materials or frame materials such as concrete panels Q and crosspieces R can be easily performed (see FIG. 25A, etc.).

[0059] <Structure suitable for dismantling boards, etc.> In this embodiment, a tapered portion 36 is formed on a part of the protruding leg portion 35 of the slider 30 (see FIG. 25A, etc.). The tapered portion 36 is a tapered portion formed in a wedge shape so as to face in a direction away from the drive shaft DA, and for example, in this embodiment, the tapered portion 36 is formed on a portion facing forward in the initial position of the retracted state of the rechargeable nail puller 1 so as to face in a direction perpendicular to the drive shaft DA (see FIG. 25A, etc.). The shape of the tapered portion 36 is not particularly limited as long as it is tapered, and both the upper surface 36t and the lower surface 36b may be inclined surfaces as in this embodiment (see FIG. 25C, etc.), or only one of them may be an inclined surface and the other surface may be a surface that is horizontal in use. In addition, the upper surface 36t and the lower surface 36b may be flat surfaces or gently curved surfaces. In short, it is sufficient that the slider 30 has a wedge shape that exerts a force to separate plate materials or frame materials such as the concrete panel Q and crosspiece R when the slider 30 is struck to drive the tapered portion 36 into the tapered portion 36.

[0060] In this embodiment, the tapered portions 36 are provided at the front ends of the pair of left and right protruding leg portions 35, and are formed symmetrically about an imaginary plane (indicated by the symbol VP in FIG. 4) including the drive shaft DA. Furthermore, the left and right tapered portions 36 are spaced apart so that the hooks of the hook members 20 can be accommodated therebetween (see FIG. 7B, etc.).

[0061] The slider 30 has a struck portion 37 formed on the side opposite the tapered portion 36 when the drive axis DA is used as a reference (the rear side in the use state) (see FIG. 25B, etc.). In this embodiment, the struck portion 37 is shaped to protrude toward the side opposite the tapered portion 36 when the drive axis DA is used as a reference, thereby clearly indicating to the user the location to be struck with the hammer 300 and preventing the hammer 300 from striking the cover 50 of the rechargeable nail puller 1 when striking (see FIG. 26, etc.). Taking the latter point into consideration in particular, the slider 30 may be formed so that the struck portion 37 protrudes sufficiently from the surface of the cover 50 (see FIG. 25C, etc.).

[0062] At least the portion of the slider 30 that is subjected to the striking operation (the portion including the tapered portion 36 and the struck portion 37) is made of a material having a rigidity that can withstand the striking. This portion may be made of metal, such as a casting. Alternatively, this portion may be made of a detachable attachment (indicated by reference symbol 40 in FIG. 25B). When a detachable attachment 40 including the tapered portion 36 and the struck portion 37 is used, the tapered portion 36 and the struck portion 37 can be easily replaced even if they are damaged. The entire attachment 40 may be made of metal, such as a casting. The attachment 40 may be provided to the rod portion 32 of the slider 30, etc., so as to be rotatable around the drive axis DA.

[0063] In this embodiment, the tapered portion 36 formed on the slider 30 as described above is sized so that its tip 36a is positioned outside the hook 22 of the hook member 20 (in other words, it is positioned farther from the drive shaft DA), and the outline of the tapered portion 36 is laid out outside the outline of the hook 22 (in other words, the hook 22 is hidden within the projection plane of the protruding leg portion 35 or the tapered portion 36 when viewed from the side) (see FIG. 25C, etc.). In this way, by forming the tapered portion 36 larger than the hook 22 and positioning it forward, it is possible to avoid the hook 22 from acting as a resistance when the tapered portion 36 is inserted into the gap between the concrete panel Q and the crosspiece R, for example.

[0064] According to the rechargeable nail puller 1 described above, the tapered portion 36 is inserted into the gap between the concrete panel Q and the crosspiece R, and the striking portion 37 is struck with the hammer 300, so that the gap between the concrete panel Q and the crosspiece R can be widened by striking force in the same manner as when using a crowbar (see FIG. 26, etc.). By sliding the slider 30 with the hook 22 and the protruding leg portion 35 deeply inserted in this way, the gap between the concrete panel Q and the crosspiece R can be further widened to make them easier to separate (see FIG. 27A, FIG. 27B, FIG. 27C, etc.). In addition, in a situation where the nail head Ph is slightly floating from the concrete panel Q or the crosspiece R but is firmly inserted, making it difficult to hook the hook 22 onto the nail head Ph, it is possible to strike the striking portion 37 with the hammer 300 in that state, gradually pushing the hook member 20 forward, and bringing the hook 22 into a state of being fully engaged with the nail head Ph.

[0065] <How to use it to lift nails from boards, etc.> The rechargeable nail puller 1 configured as described above can also be used to lift up a nail P that has been stuck into a board or frame material such as a concrete panel Q or a crosspiece R (see Figure 28A, etc.).

[0066] The nail P driven in the panel work of the formwork is often driven with the nail head Ph raised, considering the dismantling to be performed after the concrete hardens, but even so, there may be cases where the raised width is not sufficient and it is difficult to hook the hook 22, so it is convenient to raise such a nail P even higher. In this case, the nail P can be raised even higher by using the rechargeable nail puller 1. Specifically, for example, when the nail P remains stuck in the concrete panel Q separated from the crosspiece (see FIG. 28E(a)), first, the pressing tool 400 is provided in advance between the pair of left and right hooks 22, and in the protruding state with the slider 30 slid, the protruding leg 35 is placed against the surface of the concrete panel Q (the surface with the nail head Ph), and the pressing tool 400 is used to press down the nail foot Pt (see FIG. 28A, FIG. 28B, FIG. 28C, FIG. 28D, FIG. 28E(b)). When the nail head Ph floats above the surface of the concrete panel Q (see FIG. 28E(c)), the nail P can be pulled out with the rechargeable nail puller 1 (see FIG. 28E(d)), which may enable smooth and efficient work. The push-down tool 400 may be anything that can push down the tip of the nail foot Pt, and a jig that can be attached and detached to the hook 22 can be used.

[0067] The rechargeable nail puller 1 of this embodiment is a single power tool that can be used in practical applications other than nail pulling. This makes it possible to meet the potential demands of on-site workers who tend to think that having different tools for each task is costly and difficult.

[0068] [Fourth embodiment] As a fourth embodiment of the present invention, various operations of the battery-powered nail puller 1 and their controls will be described (see Figs. 31, 32A, etc.).

[0069] <Control device> The control device 90 causes the motor (drive source) 60 to cause the slider (sliding member) 30 to perform a predetermined operation in response to a trigger signal input from the outside.

[0070] <Origin sensor> The origin sensor 80 is provided as a means for detecting that the slider 30 is at an initial position. The origin sensor 80 may be an optical sensor that detects the position of the slider 30 on the drive axis DA. Alternatively, the origin sensor 80 may be a sensor that grasps the position or amount of movement of the slider 30 based on the amount of rotation of the motor 60. Alternatively, the origin sensor 80 may be composed of a switch that is arranged to detect that the slider 30 is at a predetermined position when it comes into contact with the slider 30.

[0071] <Operation mode> The rechargeable nail puller 1 of this embodiment has a number of selectable operation modes set for operating the slider 30 depending on the type of work to be performed on the work target. The operation modes are various manners of operation set so that the user can select from the manner in which the rechargeable nail puller 1 moves when pulling out nails, or in accordance with the state or desired operation when used for purposes other than pulling out nails. The rechargeable nail puller 1 of this embodiment has a "nail pulling mode," a "nail pulling one cycle mode," and a "clamp mode" that the user can select by operating a mode operation / display unit (indicated by reference symbol 92 in FIG. 31) for operating the modes.

[0072] <Nail removal operation flow> An example of an operation flow when controlling the nail pulling operation in the rechargeable nail puller 1 will be described (see Figs. 34 and 35).

[0073] After the main power is turned on (step SP301), an operation mode is selected (step SP303). As operation modes for nail pulling applications, a "nail pulling mode" and a "nail pulling one cycle mode" are set, which can be selected by the user by operating a mode selection switch (not shown) so that the user can select the way the rechargeable nail puller 1 moves when pulling out nails in accordance with the state of nail pulling to be performed or the desired operation.

[0074] <Nail removal operation flow (nail removal mode)> When the "nail pull mode" is selected in step SP303, the operation of driving to the initial position is performed first (step SP311). This is a series of automatic operations for detecting the position of the drive part of the slider 30 and moving the position of the slider 30 to a predetermined initial position as described above. When a mode change is instructed, the slider 30 moves to an initial position that differs for each mode, but if there is no mode change, this step may be skipped.

[0075] After the initial position drive operation (step SP311), the setting of the movement amount is reflected (step SP312). This step is for appropriately setting the movement amount (sliding length) of the slider 30 during the nail removal operation to be performed, and may be provided so that it can be switched by operating a switch (not shown) that can be operated or input by the user. When a switch is used, the switch may be any type, such as a tact switch or a dial switch. Although a detailed explanation is omitted, it may be possible to select an "auto" that automatically sets the movement amount or a "standard" that sets a standard movement amount. The movement amount (sliding length) of the slider 30 may be controlled based on the rotation amount of the motor (e.g., a stepping motor) 60. In this case, the rotation amount of the motor 60 may be set in advance in the control device.

[0076] While the trigger OFF signal is being input, SP303, SP311, SP312, and SP313 are continuously executed, and when the trigger is turned ON, the nail pulling operation is started (step SP314).

[0077] In the nail pulling operation step, the motor 60 is driven in the forward direction to move the slider 30 in the direction protruding from the main body 10 (i.e., the above-mentioned nail pulling operation direction) (step SP314). When the movement amount of the slider 30 reaches the preset movement amount (step SP312) (step SP315), the motor 60 is stopped to stop the driving of the slider 30 (step SP316). When the driving of the slider 30 is stopped, the system waits until the trigger is turned off (step SP317). That is, the system waits until the trigger switch 122 is released from the state where the trigger switch 122 is pulled by the user's finger (trigger ON state) (or the force pulling the switch is released) and the trigger switch 122 returns to its original state (trigger OFF state), and when the trigger signal is turned off (i.e., when the trigger is turned off), the motor 60 is rotated in the reverse direction to move the slider 30 in the direction to return to the initial position (direction to be pulled into the main body 10) (step SP318). When the slider 30 returns and reaches the initial position (step SP319), the driving of the motor 60 and the slider 30 is stopped (step SP320), and the series of operations (nail pulling mode) is terminated. After the series of operations is completed, the process returns to step SP303 to prepare for the next nail pulling operation, and performs the same operation as above in response to an input (see FIG. 34). As described above, in the nail pulling mode, the slider 30 is made to perform a predetermined operation in response to a trigger signal input from the outside, such as sliding the slider 30 a predetermined length when the trigger signal is turned on.

[0078] <Nail removal operation flow (nail removal 1 cycle mode)> The operation flow when the "nail pulling one cycle mode" is selected in step SP303 will be described (see FIG. 35, etc.). In the "nail pulling one cycle mode", the operation of driving to the initial position is performed (step SP321), and then the operations of setting the amount of movement (step SP322), waiting for the trigger to be ON (step SP323), the nail pulling operation (step SP324), reaching the set amount of movement (step SP325), and driving stop (step SP326) are performed in this order (see FIG. 35). The operations up to this point are the same as those in steps SP311 to SP316 in the "nail pulling mode" described above (see FIGS. 34 and 35).

[0079] Thereafter, in the nail pulling one cycle mode, regardless of the state of the trigger switch 122 (trigger ON or trigger OFF), the motor 60 is rotated in the reverse direction to move the slider 30 in the direction returning it to its initial position (step SP327), and it is not held in the protruding state. When the slider 30 returns and reaches its initial position (step SP328), the driving of the motor 60 and the slider 30 is stopped (step SP329). After the driving is stopped, the system waits until the trigger is turned OFF (step SP330), and when the trigger switch 122 goes from being pulled by the user's finger (trigger ON state) to returning to its original state (trigger OFF state), the system returns to step SP303 and prepares for the next nail pulling operation (see Figures 34 and 35). As described above, in the nail pulling one cycle mode, when the trigger signal is turned ON, the slider 30 is slid a predetermined length set in advance, and then is caused to return to its initial position.

[0080] <Nail puller + clamp operation flow> The rechargeable nail puller 1 may be configured to perform a clamping operation in addition to a nail pulling operation. An example of an operation flow in such a case where both the nail pulling operation and the clamping operation can be performed will be described (see Figs. 36A to 36C).

[0081] After the main power is turned on (step SP501), one of the operation modes is selected from "nail pull mode," "nail pull one cycle mode," and "clamp mode" (step SP503). The operation flow when "nail pull mode" is selected (steps SP511 to SP520, see FIG. 36A) is the same as that in the above-mentioned "nail pull mode" (see FIG. 34), and the operation flow when "nail pull one cycle mode" is selected (steps SP521 to SP530, see FIG. 36B) is the same as that in the above-mentioned "nail pull one cycle mode" (see FIG. 35), so they will not be described here. An example of the operation flow when "clamp mode" is selected will be described below (see FIG. 36C).

[0082] <Clamp operation flow (clamp mode)> If the "clamp mode" is selected in step SP503, the motor 60 is driven in the forward direction to drive the slider 30 to the position where it is most protruded from the main body 10 (hereinafter also referred to as the "maximum extension position") (step SP531), and the process waits until the trigger switch 122 is pulled and a "trigger ON" signal is transmitted (step SP532). When the trigger is ON, the motor 60 is rotated in the reverse direction to start a clamping operation (an operation of clamping a work target, such as a pair of battens of a concrete panel Q, between the hook 22 and the protruding leg 35) (step SP533). If a predetermined load (clamp load) is generated before the slider 30 reaches the initial position after the clamping operation is started (NO in step SP534, YES in step SP535), the drive of the motor 60 and the slider 30 is stopped at that point (step SP536), and the process waits until the trigger is OFF while maintaining the work target clamped (step SP537). That is, the process waits until the trigger switch 122 is released from the state where the user's finger is still pulling the trigger switch 122 (trigger ON state) (or the force pulling the switch is released) and the trigger switch 122 returns to its original state (trigger OFF state), and once the trigger switch 122 is in the trigger OFF state, the process waits until the trigger switch 122 is pulled and the trigger switch 122 is in the trigger ON state (step SP538). Once the trigger switch 122 is in the trigger ON state, the motor 60 is rotated forward again to drive the slider 30 to return to the maximum extension position (step SP540). Once the slider 30 has reached the maximum extension position (step SP541), the drive of the motor 60 and the slider 30 is stopped (step SP542). Thereafter, the process waits until the trigger switch 122 is in the trigger OFF state (step SP543), and once the trigger switch 122 is in the trigger OFF state, the process returns to the step of selecting the operation mode (step SP503).

[0083] Furthermore, if the slider 30 has reached its initial position in step SP534 (YES in step SP534), it is determined that the work object, etc. was not clamped while the slider 30 moved from the maximum extension position to the initial position, and the process proceeds to step SP539 to stop driving (see FIG. 36C).

[0084] The load acting on the slider 30 and the motor 60 during the operation of the slider 30 can be detected based on the current value of the motor 60. For reference, an example of a current waveform of the motor 60 when the motor 60 is driven in the reverse direction in the clamp mode is shown here (see FIG. 37). The current value when the work object is clamped is greater than the current value when the motor 60 is driven in the reverse direction in the nail pull mode (specifically, when the slider 30 is returned to the initial position after the nail pull operation (step SP518) (see FIG. 36A)). Therefore, when a threshold current C1 during reverse drive in the nail pull mode is set, by setting a value C2 greater than the current C1 as the threshold current during reverse drive in the clamp mode, it is possible to detect the completion of the clamp operation based on the threshold current C2 (see FIG. 37).

[0085] <Operation flow for initial position detection (sensorless)> Next, an operation flow for positioning the slider 30 and the like to the initial position in accordance with a trigger signal in the rechargeable nail puller 1 will be described. Here, three types of patterns will be described for the rechargeable nail puller 1 that is sensorless, i.e., has no sensor for detecting the position of the slider 30: pattern 1 in which there is no room for a member to be pinched, pattern 2 in which there is room for a member to be pinched and the operation ends normally, and pattern 3 in which a member is pinched and the operation ends abnormally (see Figs. 32A to 32D). Note that the flow showing the operations of each of the three types of patterns 1 to 3 is as shown in Fig. 32A. Also, in Figs. 32B to 32D, any part of the slider 30 is designated as the "operating part," and the part is indicated by a hollow triangle symbol to show the movement and amount of the slider 30. Note that the sliding movement of the slider 30 (toward the bottom of the rechargeable nail puller 1) relative to the main body 10 of the rechargeable nail puller 1 (see Fig. 7B, etc.) is represented as a movement to the right (the nail pulling operation direction) in Figs. 32B to 32D. Furthermore, parts that are related between the operations in the flow (see FIG. 32A) and the operations in each pattern (see FIGS. 32B to 32D) are given the same numbers in parentheses.

[0086] <Operation flow for initial position detection (sensorless) (Pattern 1)> In the rechargeable nail puller 1, when the main power is turned on (step SP101), this serves as an initial trigger to start the operation flow for detecting the initial position of the slider 30 (see Figs. 32A and 32B). When the trigger signal is turned on in this manner to start the flow, first, the motor 60 is driven in the reverse direction (step SP110), and it is determined whether or not a high load (a high load exceeding a predetermined value) is detected when the slider 30 hits a position where it cannot slide any further (hereinafter referred to as the "reverse limit position") (step SP111). If a high load is detected (YES in step SP111), the motor 60 is driven in the forward direction (step SP141), and it is determined whether or not the slider 30 has moved a predetermined amount equivalent to the initial position setting specified amount X0 (step SP142).

[0087] Here, the "prescribed amount X0 for initial position setting" refers to an amount equivalent to the difference between the "target initial position W0" where the slider 30 should be located at the beginning of the operation and the above-mentioned "reverse side limit position W1" (see FIG. 32B). In this embodiment, the slider 30 is once pulled back to the reverse side limit position W1, and then slid a predetermined length equivalent to the prescribed amount X0 for initial position setting to position the slider 30 at the target initial position W0 (to position the slider 30). Specifically, when it is detected that the slider 30 has moved from the "reverse side limit position W1" by the "prescribed amount X0 for initial position setting" (YES in step SP142), the motor 60 is stopped as the slider 30 has reached the "target initial position W0" (step SP143), a series of initial position detection operations is completed (step SP144), and the control shifts to normal control (control associated with operations such as nail pulling) (step SP150).

[0088] <Operation flow for initial position detection (sensorless) (Pattern 2)> In the following Pattern 2, an operation flow will be described in the case where there is room for some member to be pinched during the movement of the slider 30 accompanying the detection of the initial position (see FIGS. 32A, 32C, etc.).

[0089] The process from step SP101 to step SP111 is the same as that of pattern 1 (see FIG. 32A). In step SP111, if "a high load is not detected when the slider 30 hits the reverse rotation limit position W1" (NO in step SP111), it is determined whether the movable part has moved by a specified amount X1 (whether the movable part has entered the main body part 10) (step SP121). The specified amount X1 here is different from the above-mentioned initial position setting specified amount X0. Until the amount of movement of the movable part reaches this specified amount X1, the flow of returning to step SP111 is repeated (NO in step SP121). When the amount of movement of the movable part reaches the specified amount X1 (YES in step SP121), the motor 60 is rotated forward (step SP122), and the slider 30 is moved in a direction protruding from the main body part 10, and it is determined whether a high load is detected at the forward rotation limit position W2 (step SP123). The forward rotation limit position W2 here is a position where the slider 30 cannot slide any further in the protruding direction (see FIG. 32C), and is the end of the possible stroke width of the slider 30. Here, the process waits until a high load exceeding a predetermined value is detected, and if detected, it is determined that the slider 30 has reached the forward rotation limit position W2, and proceeds to step SP124 (see FIG. 32A).

[0090] In step SP124, the motor 60 is rotated in the reverse direction to move the slider 30 in the direction in which it is pulled into the main body 10. After that, it is determined whether or not a high load is detected at the reverse limit position W1 (step SP125). Here, it waits until a high load exceeding a predetermined value is detected, and if it is detected, it is determined that the slider 30 has reached the reverse limit position W1.

[0091] Next, the slider 30 is set to the abnormality prevention regulation amount X ap It is determined whether the movement has been made by the amount X of abnormality prevention (step SP126). apis an amount set as an index for determining whether or not an abnormality such as the slider 30 getting caught on something or a foreign object getting caught in the middle of its movement (in this embodiment, from the forward limit position W2 to the reverse limit position W1), and is set as an amount that occupies a predetermined proportion of the possible stroke width of the slider 30 (see FIG. 32C). ap If the slider 30 has moved by more than this amount, it is determined that no abnormality has been found in the series of operations up to this point, and the process proceeds to step SP141 described above. After step SP141, the same operations as those in pattern 1 described above are performed (steps SP141 to SP144, and step SP150). On the other hand, if the slider 30 has moved by more than this amount in step SP126, the process proceeds to step SP142. ap If it has not moved any further, the process proceeds to step SP131 (see FIG. 32A). Step SP131 will be explained in the following pattern 3.

[0092] <Operation flow for initial position detection (sensorless) (Pattern 3)> In the following Pattern 3, the slider 30 is moved to the abnormality prevention specified amount X ap A flow will be described below when the slider 30 does not move beyond the abnormality prevention stipulated amount X ap If the slider 30 does not move beyond the forward limit position W2, it is determined that an abnormal lock has occurred due to an event such as the slider 30 getting caught on something or a foreign object being caught while moving from the forward limit position W2 to the reverse limit position W1 (step SP131). In this case, the operation flow for detecting the initial position is terminated. Also, the user may be notified of the occurrence of the abnormal lock by turning on a lamp provided on the main body 10 of the rechargeable nail puller 1 or by sounding a buzzer.

[0093] <Operation flow for initial position detection (with sensor)> Next, another embodiment of the operation flow for positioning the slider 30 and the like to the initial position in accordance with the trigger signal in the live nail puller 1 will be described. op Pattern 1 starts detection at "Origin position W op Pattern 2, which starts detection at "<Moving part position", "Moving part position = origin position W op " and pattern 3, which starts detection at the origin position W. The three patterns will be described below (see Figs. 33A to 33D). Note that the flow showing the operations of each of the three patterns 1 to 3 is as shown in Fig. 33A. The "operating part" is as described in the above embodiment. Also, the "origin position" here refers to the position or range where the "operating part" should be when the slider 30 is in the initial position. In this embodiment, as a detection sensor, this operating part is positioned at the origin position W. op The position is detected using a sensor (for example, an origin sensor indicated by reference numeral 80 in FIG. 31) that detects whether the slider 30 is located at the origin. Although there is no limitation on specific examples that are expected to be used as the detection sensor, one example is a non-contact Hall IC that detects a magnet attached to the slider 30.

[0094] In the rechargeable nail puller 1, when the main power is turned on (step SP201), this serves as an initial trigger to start the operation flow for detecting the initial position of the slider 30 (see Figs. 33A and 33B). When the trigger signal is turned on in this manner to start the flow, the state of the origin sensor is confirmed to determine whether the origin sensor has detected the moving part of the slider 30 or is not in a detecting state (step SP203). If it is in a not-detecting state, the operation flow first proceeds according to pattern 1 (see Fig. 33A).

[0095] <Operation flow for initial position detection (with sensor) (Pattern 1)> In pattern 1, first, the motor 60 is driven in the forward direction (step SP211), and the slider 30 is moved in the direction protruding from the main body 10 (the nail pulling operation direction) (see FIG. 33A). After that, the process waits to see whether the origin sensor detects the operating part (step SP212). If it does, the process proceeds to step SP213. On the other hand, if the operating part of the slider 30 has moved a specified amount without being detected, the process proceeds according to the operation flow of pattern 2 described later.

[0096] When the origin sensor detects the moving part (step SP212), the process waits until the origin sensor does not detect the moving part (step SP213). When the slider 30 is moved to the non-detecting state, the moving part is returned to the origin position W. op At this point, the motor 60 is rotated in the reverse direction (step SP214) to move the slider 30 in the direction of pulling it back. After that, when the origin sensor detects the moving part (step SP215), the origin position W op The moving part that has passed through returns to the origin position W op In this embodiment, it is determined that the initial position has been returned to the initial position, and the motor 60 is stopped once (step SP241), and in that state, a series of initial position detection operations are completed (step SP242), and then the process transitions to normal control (control associated with operations such as nail pulling) (step SP250).

[0097] <Operation flow for initial position detection (with sensor) (Pattern 2)> In the above pattern 1, when the main power is turned on (initial trigger), the moving part position is less than the origin position W. op ”(Origin position W op This was a pattern that corresponds to the case where the moving part is located in the direction of the nail pulling operation rather than the moving part. However, in the middle of the operation flow, at the time of the first trigger, the original position W op <Moving part position> (Moving part is at origin position W op If it is determined that the nail is pulled out in the direction of the nail pull-out operation relative to the target position), the operation flow of pattern 2 described below is carried out (see Figs. 33A and 33C).

[0098] That is, after driving the motor in the forward direction (step SP211), in step SP212, which waits to see if the origin sensor detects the moving part, if the moving part of the slider 30 moves by a specified amount X2 without being detected (see FIG. 33C), the motor 60 is rotated in the reverse direction (step SP222) to move the slider 30 in the direction of pulling back. After that, when the origin sensor detects the moving part (step SP223), the original "origin position W op The moving part that was in the "moving part position" has now moved to the origin position W op Then, the motor 60 is stopped (step SP241), a series of initial position detection operations is completed (step SP242), and the process shifts to normal control (step SP250).

[0099] <Operation flow for initial position detection (with sensor) (Pattern 3)> After the main power is turned on (step SP201), when the origin sensor detects the moving part of the slider 30 ("moving part position = origin position W"), op ") (step SP203), the operation flow proceeds according to pattern 3 (see Figs. 33A and 33D). In pattern 3, first, the motor 60 is driven in the forward direction (step SP231), the slider 30 is moved in the direction in which it protrudes from the main body 10 (the nail pulling operation direction), and the operation waits until the origin sensor goes into a non-detection state (step SP232). If the non-detection state is reached, the motor 60 is rotated in the reverse direction (step SP233), and the slider 30 is moved in the direction in which it is pulled back. Thereafter, the operation waits until the origin sensor detects the operating part (step SP234). When the origin sensor detects the operating part, the origin position W op The moving part that has passed through returns to the origin position W op Then, the motor 60 is stopped (step SP241), and in this state, a series of initial position detection operations is completed (step SP242), and the process shifts to normal control (step SP250).

[0100] <Nail removal + initial position detection + clamp operation flow> An initial position detection operation after the trigger is turned on may be added to the above-mentioned nail puller + clamp operation. An example of the operation flow in this case will be described (see Figs. 38A to 38C). Note that the following description will focus on the differences from the above-mentioned nail puller + clamp operation flow (see Figs. 36A to 36C).

[0101] In this operation flow, after the main power is turned on (step SP601), the initial position of the slider 30 is detected (step SP602). In the case of a sensorless system, the initial position is detected as in the above-mentioned "Operation flow for initial position detection (in the case of sensorless)" (see Figs. 32A to 32D), and in the case of a sensor, the initial position is detected as in the above-mentioned "Operation flow for initial position detection (in the case of sensor)" (see Figs. 33A to 33D). Thereafter, a nail pulling operation or a clamping operation is performed (see Figs. 38A to 38C) similar to the above-mentioned "Operation flow for nail pulling + clamping" (see Figs. 36A to 36C).

[0102] The above-mentioned embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto and various modifications can be made without departing from the scope of the present invention. For example, in the above-mentioned embodiment, a structure in which the hook member 20 (the hook 22) is moved relatively by sliding only the slider 30 (a structure in which the hook 22 is fixed relatively to the main body 10) has been described, but a structure in which both the slider 30 and the hook member 20 are moved simultaneously may also be used. Although not particularly shown here, for example, a rack-and-pinion mechanism may be used to link the slider 30 and the hook member 20, or a linking mechanism that links the slider 30 to the protruding movement may be used to slide the hook member 20 in the opposite direction.

[0103] In the above embodiment, the rechargeable nail puller 1 using the motor 60 as the drive source has been described (see FIG. 6B, etc.), but this is merely one example of a suitable configuration. Although not particularly illustrated, in addition to an electric nail puller using a motor as the drive source, various power nail pullers such as a compressed air nail puller using an air motor and a hydraulic nail puller using a hydraulic motor, or various electric tools using an AC electric motor as the drive source can be configured. Alternatively, the slider 30 may be driven by an air cylinder, or the drive mechanism 70 may be configured using a trapezoidal screw instead of the ball screw 73. Alternatively, a rack and pinion, a worm gear, or the like may be used to convert the rotation of the motor 60 into linear motion. [Industrial Applicability]

[0104] The present invention is suitably applicable to various power tools, including an electric nail puller. [Explanation of symbols]

[0105] 1…Chargeable nail puller (power tool) 10...Main body 11... Mechanism section 12...Hand grip (grip part) 13…Battery compartment 13S…Placement surface 14...Main frame (guiding member) 15…Frame base 20...Hook member (engagement member, guide member) 21...Rotating portion of hook member (rotating portion of engagement member) 22...Hook (engagement part) 22'…Hook 23...Cylindrical part 24…Fastening screw 26...O-ring (resistor) 30...Slider (sliding member) 31...Tip of slider (tip of sliding member) 31f…Flat surface 32…Slider rod part 32a…Flange section 32b... Female thread 32c…Sleeve section 33…Slider side cover 34...Rotating part of slider (rotating part of sliding member) 35...Slider protruding leg (retaining part) 36...Tapered portion (pointed portion) of protruding leg of slider 36a...Tip of tapered part (tip of pointed part) 36b…Bottom surface of tapered section 36t…Top surface of tapered section 37...Battered part 38...O-ring (resistor) 40…Slider attachment 50…Cover 60...Motor (drive source) 66…Battery 70...Drive mechanism 71...Reduction gear (part of the drive mechanism) 72...Screw shaft 72'...Screw shaft 73...Ball screw (part of the drive mechanism) 80...Origin sensor (sensor that detects the position of the slider) 90...Control device 92…Mode operation and display section 122...Trigger switch 132…Strap 134…Belt hook 300…Hammer 400…Push-down tool C1: Threshold current during reverse drive in nail pull mode C2: Threshold current during reverse drive in clamp mode DA…Drive shaft L1: Length equivalent to the internal space required for the stroke of the hook member Los…Hook offset amount L2: Height of mechanism in initial position (retracted state) L3: Length from the drive shaft DA to the front end of the flat surface L4: Horizontal length from drive shaft DA to the tip of the hook L5: Horizontal length from the tip of the hook to the tip of the protruding leg P…Nail (work object) Pc: Imaginary central axis when nail P is assumed to be straight Ph…nail head Pt…nail foot Q: Concrete panel (work target) R… Crosspiece (work object) U...(users) User VP: Virtual plane including the drive shaft W0…Target initial position W1: Reverse limit position W2: Forward rotation limit position W op ...Origin position X0: Initial positioning amount X1…Specified amount X2…Specified amount X ap …Specified amount for abnormality prevention

Claims

1. An electric tool used for tasks such as nail removal, A main body portion, An engagement member provided on the main body portion and having an engagement portion that engages with a part of a work target; a sliding member that moves in and out of the main body portion to move a part of the sliding member toward and away from the engaging member; A drive source for operating the sliding member; a control device that causes the driving source to perform a predetermined operation on the sliding member in response to a trigger signal input from an external device; Equipped with A plurality of selectable operation modes are set for operating the sliding member according to the content of the work on the work object, As one of the operation modes, a clamp mode is set in which the engaging member and the sliding member clamp all or a part of a work target, When the trigger signal is turned on, the sliding member is caused to slide a predetermined length.

2. The power tool according to claim 1 , wherein when the trigger signal is turned on, the sliding member is caused to slide a preset length and stopped at the position.

3. The power tool according to claim 1 or 2, wherein the sliding member is returned to an initial position when the trigger signal is turned off.

4. The power tool according to claim 1 , wherein when the trigger signal is turned on, the sliding member is caused to slide a preset length and returned to an initial position.

5. The power tool according to claim 3 or 4, wherein the initial position is a position in which the sliding member is most retracted into the main body portion.

6. The power tool according to claim 5 , further comprising a sensor for detecting when the sliding member is in the initial position.

7. The power tool according to claim 1 , wherein a sliding length of the sliding member is controlled based on an amount of rotation of a motor serving as the drive source.

8. The power tool according to claim 7 , wherein an amount of rotation of the motor is preset in the control device.

9. The power tool according to claim 1 , wherein, in the clamp mode, driving by the driving source is stopped under a predetermined condition based on a load acting on the driving source and / or the sliding member.

Images