power tools

Abstract

To provide an electric tool which is configured to easily achieve miniaturization, and can improve handleability and ease of handling of a device by the structure.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, and a drive source operating the slide member 30. The slide member 30 slides along a guide member provided in the body part 10.SELECTED DRAWING: Figure 16

Description

[Technical Field]

[0001] This invention relates to power tools. [Background technology]

[0002] In construction sites, for example, after concrete has been poured into a mold made of a board called a concrete panel, nail removal may be necessary when separating the board material from the frame material. In such situations, mechanized, powered nail removers, such as air-operated, hydraulic, or electric types, are sometimes used. Conventional nail removers used in such situations generally have a structure in which a hook for catching nails is threaded, and the hook is moved 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 Publication No. 5-5376 [Patent Document 2] Japanese Patent Application Publication No. 11-48161 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, conventional powered nail pullers, as described above, have a structure that pulls out nails by moving a hook up and down. Therefore, it is necessary to secure enough space (working area) within the casing to move the hook up and down, which naturally limits the degree of miniaturization. Various tools, such as electric nail pullers, that are designed for workers to hold in their hands while performing tasks such as nail removal, tend to have their handling affected if the casing is large. This effect on ease of handling is particularly noticeable for beginners or users with relatively less strength. Poor handling means that, in the case of nail pullers, it becomes difficult to aim at nails or to hook nails, which can lower the quality of ease of use and handling, potentially lowering the evaluation of the tool's operability and performance.

[0005] Therefore, the present invention aims to provide an electric power tool that has a structure that facilitates miniaturization, thereby improving the maneuverability and ease of use of the device. [Means for solving the problem]

[0006] One aspect of the present invention is an electric power tool used for tasks such as nail removal, The main body and An engaging member provided on the main body side and having an engaging portion that engages with a part of the work object, A sliding member that extends and retracts relative to the main body, causing a part of it to move closer to and further away from the engaging member, A drive source for operating the sliding member, It is a power tool equipped with [features / equipment].

[0007] For example, in an electric tool used as a nail puller, a sliding member, which is retractable relative to the main body of the tool, slides, thereby separating the tip of the sliding member from an engaging member fixed to the main body. At this time, the contact member (i.e., the tip of the sliding member) that contacts the board or frame in which the nail is driven (i.e., the tip of the sliding member) protrudes in the opposite direction to the direction of nail extraction, causing the engaging member fixed to the main body to move relative to it in the direction of nail extraction, and thus the nail can be extracted. Moreover, in this electric tool, the sliding member is slid to the outside of the tool body, which allows the engaging member and the tip of the sliding member to be separated relatively. In other words, a structure in which the sliding member slides to the outside of the tool 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 this structure makes it easier to miniaturize the device.

[0008] Furthermore, for power tools designed for workers to hold in their hands while performing tasks such as nail removal, it is important that, from the perspective of ease of operation and maneuverability, they are not only small and lightweight, but also that the distance between the grip held in the hand and the part that hooks onto the nail (the engaging part of the engaging component) be as close as possible. In this regard, with the power tools described above, it is possible to create a structure in which the grip is closer to the main body by, for example, positioning the motor on the vertical line of the sliding component (excluding the stroke range), thereby improving the ease of operation and maneuverability when engaging the engaging part (hook, etc.) with the workpiece (nail, etc.).

[0009] In the power tool as described above, the sliding member may slide along a guide member provided on the main body.

[0010] In the power tool described above, the sliding member may receive the driving force from a drive source via a drive mechanism including a ball screw and perform linear motion.

[0011] The electric power tool in the above-described aspect may have a configuration in which the drive source is a motor and a sliding member is linearly moved by a ball screw connected to the motor.

[0012] In the electric power tool in the above-described aspect, the drive source and the drive mechanism for transmitting the driving force of the drive source to the sliding member may be arranged coaxially with a drive shaft that passes through the sliding member and extends along the sliding direction of the sliding member.

[0013] In the electric power tool in the above-described aspect, the drive source and the drive mechanism may be arranged on the extension line of the drive shaft of the sliding member.

[0014] In the electric power tool in the above-described aspect, a grip portion having a structure that is easy for users such as the user who uses the electric power tool to grip during use or the like may be arranged at a portion excluding the extension line of the drive shaft.

[0015] The grip portion in the electric power tool in the above-described aspect may be formed so as to extend in a direction perpendicular to the drive shaft.

[0016] In the electric power tool in the above-described aspect, the engaging member may be slidable and may be interlocked in a direction opposite to that of the sliding member by an interlocking mechanism.

[0017] The electric power tool in the above-described aspect may further include a rechargeable battery.

[0018] The electric power tool in the above-described aspect may be used as a charging nail puller.

Advantages of the Invention

[0019] According to the electric power tool of the present invention, a structure that easily realizes miniaturization can be obtained, and thereby, the handling property and the ease of use of the device can be improved.

Brief Description of the Drawings

[0020] [Figure 1]This is a perspective view showing a mounted state of a cordless nail puller, which is an example of a power tool. [Figure 2] This is a front view of a rechargeable nail puller in the position where the hook member is facing directly downwards (in use). [Figure 3] Figure 2 is a right side view of the rechargeable nail puller shown. [Figure 4] Figure 3 shows the rechargeable nail puller viewed from above. [Figure 5] Figure 3 shows the rechargeable nail puller viewed from below. [Figure 6A] This is a cross-sectional view of the rechargeable nail puller along the VI-VI line in Figure 4. [Figure 6B] This is a diagram of a rechargeable nail puller with the slider slid in the same cross-section as Figure 6A. [Figure 7A] This is a perspective view of a rechargeable nail puller with the tip of the slider resting against a concrete panel. [Figure 7B] This figure shows a magnified view of the area around the tip of the slider in Figure 7A. [Figure 8A] Figure 7A is a perspective view of the rechargeable nail puller with the slider slid to the position shown. [Figure 8B] This is a magnified view of the area around the hook member in Figure 8A. [Figure 9A] This diagram shows the internal components of the mechanism, such as hook members and sliders, as viewed from the front. [Figure 9B] Figure 9A shows cross-sectional views of the hook member, slider, ball screw, etc., along the IXB-IXB line. [Figure 10A] This is a side view of the hook member, slider, ball screw, etc., with the hook attached to the nail and the sliding member partially slid. [Figure 10B] Figure 10A is a longitudinal cross-sectional view of a hook member, slider, ball screw, etc. [Figure 11] This is a perspective view from below of the hook component, slider, ball screw, etc., with the hook attached to the nail and the slider partially slid down. [Figure 12]Figure 11 is a perspective view of the hook member, slider, ball screw, etc. (excluding the cover around the ball screw). [Figure 13] Figure 12 is a perspective view showing some of the hook members, sliders, ball screws, etc. [Figure 14A] Figure 13 is a perspective view showing the hook member and the main frame portion of each component shown. [Figure 14B] Figure 13 is a perspective view showing the slider and ball screw portions of each component shown. [Figure 15] To illustrate one of the advantages of the present invention, which is miniaturization, this figure shows a comparison between (A) a rechargeable nail puller in one embodiment of the present invention and (B) a conventional rechargeable nail puller. [Figure 16] This diagram illustrates miniaturization, one of the advantages of the present invention, by showing (A) the rechargeable nail puller before sliding the slider and (B) the rechargeable nail puller after sliding the slider side by side. [Figure 17A] This is a front view of the hook component, slider, etc., of a conventional nail puller, where the hook is attached to a nail that has been driven in at an angle. [Figure 17B] Figure 17A shows cross-sections of the hook member, slider, etc., along the XVIIB-XVIIB line of a conventional nail puller. [Figure 17C] This is a perspective view showing a conventional nail puller, including the hook component and slider, in a state where the hook is attached to a nail that has been driven in at an angle. [Figure 18A] This is a front view of the hook component, slider, etc., in a conventional nail puller, after the slider has been slid to remove a nail that was driven in at an angle. [Figure 18B] Figure 18A shows cross-sections of the hook member, slider, etc., along the line XVIIIB-XVIIIB in a conventional nail puller. [Figure 19A] This is a longitudinal cross-sectional view illustrating a hook member in which the hook portion is positioned at an offset location from the drive shaft. [Figure 19B] This is a longitudinal cross-sectional view illustrating how a nail is removed using a hook member, in which the hook portion is positioned at an offset location from the drive shaft. [Figure 20A] This is a perspective view showing a rechargeable nail puller with the tip of the slider pressed against a concrete panel, without the cover. [Figure 20B] Figure 20A is a perspective view of the rechargeable nail puller with the slider slid to the position shown. [Figure 21A] This is a perspective view showing a rechargeable nail puller with the hook orientation changed so that the tip of the slider is placed against a concrete panel. [Figure 21B] Figure 21A is a perspective view of the rechargeable nail puller with the slider slid to the position shown. [Figure 22A] This is a perspective view of a rechargeable nail puller with a reversible hook, seen from the tip of the slider. [Figure 22B] Figure 22A is a perspective view showing the rechargeable nail puller with the hook orientation changed. [Figure 23A] This is a right-side view showing a rechargeable nail puller with the tip of the slider applied to a concrete panel. [Figure 23B] Figure 23A is a longitudinal cross-sectional view of the rechargeable nail puller shown. [Figure 24A] This is a right side view of the rechargeable nail puller with the slider slid to the position shown in Figure 23A. [Figure 24B] Figure 24A is a longitudinal cross-sectional view of the rechargeable nail puller shown. [Figure 24C] This is a vertical cross-section of a rechargeable nail puller viewed from the front. [Figure 25A] This diagram shows how the pointed end of the attachment is inserted between a concrete panel (board material) and a wooden frame (frame material), and the part to be struck is struck with a hammer. [Figure 25B] This diagram shows a magnified view of the attachment part of a cordless nail puller, with its pointed end inserted between a concrete panel (board material) and a wooden frame (framing material). [Figure 25C] This is a magnified vertical cross-sectional view showing the attachment portion of a cordless nail puller with its pointed end inserted between a concrete panel (board material) and a wooden frame (framing material). [Figure 26]This is a perspective view showing how the pointed end of the attachment is inserted between a concrete panel (board material) and a wooden frame (frame material), and how the part to be struck is struck with a hammer. [Figure 27A] This diagram shows the state after inserting the pointed part between the concrete panel (board material) and the batten (frame material), and then sliding the slider to separate the concrete panel and the batten. [Figure 27B] This is a perspective view of the state shown in Figure 27A, but from a different angle. [Figure 27C] This is a view (side view) of the same state as shown in Figure 27A, but from yet another angle. [Figure 28A] This is a side view showing how a nail that is still embedded in a concrete panel is pushed down using a hook and slider, lifting the nail away from the concrete panel. [Figure 28B] Figure 28A shows a cross-sectional view of the rechargeable nail puller. [Figure 28C] This is a perspective view from a different angle showing how a nail that is still embedded in a concrete panel (board) is pushed down using a hook and slider, lifting the nail away from the concrete panel. [Figure 28D] This is a magnified view of the rechargeable nail puller shown in Figure 28C. [Figure 28E] The diagrams (a) through (d) show the process of using a hook and slider to push down the nail shaft of a nail stuck in a concrete panel, lifting the nail from the concrete panel, and then removing it. [Figure 29A] This is a perspective view showing how a rechargeable nail puller's hook and slider are used to clamp onto a frame material (batten). [Figure 29B] This is a view from a different angle of how a rechargeable nail puller's hook and slider are used to clamp onto a frame material (batten). [Figure 30A] This is a perspective view showing, for reference, the part of a conventional cordless nail puller in which the hook is positioned directly below the ball screw. [Figure 30B] This is a side view diagram showing, for reference, the part of a conventional cordless nail puller in which the hook is positioned directly below the ball screw. [Figure 31] This is a block diagram showing examples of configurations for control devices, origin sensors, etc. [Figure 32A] This chart shows the operation flow for initial position detection (in the case of sensorless operation). [Figure 32B] This diagram shows a schematic of the operation (Pattern 1) for initial position detection (in the case of sensorless operation). [Figure 32C] This diagram shows a schematic of the operation (pattern 2) for initial position detection (in the sensorless case). [Figure 32D] This diagram shows a schematic of the operation (pattern 3) for initial position detection (in the sensorless case). [Figure 33A] This chart shows the operation flow for initial position detection (when a sensor is present). [Figure 33B] This diagram shows a schematic representation of the operation (pattern 1) for initial position detection (when a sensor is present). [Figure 33C] This diagram shows a schematic of the operation (pattern 2) for initial position detection (when a sensor is present). [Figure 33D] This diagram shows a schematic of the operation (pattern 3) for initial position detection (when a sensor is present). [Figure 34] This is a chart showing the part of the nail removal operation flow corresponding to the "nail removal mode". [Figure 35] This is a chart illustrating the part of the nail removal operation flow corresponding to the "nail removal 1 cycle mode". [Figure 36A] This is a chart illustrating the "nail removal mode" portion of the nail removal and clamping operation flow. [Figure 36B] This is a chart illustrating the "nail removal 1-cycle mode" portion of the nail removal + clamp operation flow. [Figure 36C] This is a chart illustrating the "clamping mode" portion of the nail removal + clamping operation flow. [Figure 37] This graph shows an example of the current waveform during reverse drive in clamp mode. [Figure 38A]This is a chart illustrating the "nail removal mode" portion of the operation flow for nail removal, initial position detection, and clamping. [Figure 38B] This is a chart illustrating the part of the nail removal + initial position detection + clamping operation flow that corresponds to the "nail removal 1 cycle mode". [Figure 38C] This is a chart illustrating the "clamping mode" portion of the operation flow for nail removal, initial position detection, and clamping. [Modes for carrying out the invention]

[0021] Hereinafter, embodiments of the power tool according to the present invention will be described with reference to the drawings.

[0022] [First Embodiment] As a first embodiment of the present invention, a configuration in which an electric tool is used as a rechargeable nail puller will be described (see Figure 1, etc.). The rechargeable nail puller 1 is a type of rechargeable electric tool used for nail pulling work, such as removing nails P that have penetrated into board materials or frame materials such as concrete panels Q or battens R. The rechargeable nail puller 1 of this embodiment is a tool equipped with a main body 10, a hook member 20, a slider 30, a cover 50, a motor 60, etc. (see Figures 1 to 19B, etc.), and is configured to perform a nail pulling operation in accordance with the movement when the hook member 20 fixed to the main body 10 is hooked onto the nail head Ph, and the slider 30 is extended from the main body 10 along the drive shaft DA (see Figure 19B, etc.). 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.

[0023] The main body 10 is the part that constitutes the main body of the rechargeable nail puller 1, and in this specification, it specifically refers to the part excluding the drive part (slider 30, etc.). The main body 10 of this embodiment mainly consists of a mechanism part 11 that houses the motor 60, etc., a grip part 12 that is held by the user U (only the part of the hand holding the rechargeable nail puller 1 is shown in Figures 7A and 8A) when in use, and a battery housing part 13 that houses the battery 66, etc. (see Figures 3 to 5, etc.).

[0024] The mechanism section 11 houses the motor 60, as well as a drive mechanism (for example, a reduction gear 71, a screw shaft 72, etc., described later) 70 for transmitting the driving force of the motor 60 to the slider 30 (see Figure 6B, etc.). The mechanism section 11 is further provided with a main frame 14, a cover 50, a hook member 20, etc. (see Figure 6A, etc.).

[0025] The grip portion 12 is formed to connect the battery housing portion 13, which tends to be relatively bulky, and the mechanism portion 11, excluding the portion directly on the extension of the drive shaft DA. The overall design ensures good weight balance and ease of handling when the user grasps the grip portion 12 to lift and operate the rechargeable nail puller 1 (see Figures 4 and 5, etc.). In this embodiment, the grip portion 12 is formed to extend perpendicular to the drive shaft DA, but of course, it may also be formed to extend slightly diagonally, taking into consideration the ease of performing nail pulling work. A trigger switch 122 that can be operated with a finger is provided on the part of the grip portion 12 closer to the mechanism portion 11 (see Figure 3, etc.). Although not described in detail here, the grip portion 12 is formed in a shape and size that is easy to grip, and flexible material is placed on the surface, etc., to make it less slippery and easier to grip.

[0026] The battery housing 13 is the part that houses a rechargeable battery 66, and is one of the heaviest parts of the main body 10. In this embodiment, the battery housing 13 is constructed with a roughly rectangular prism-shaped casing, making it easy to accommodate even large batteries 66 (see Figure 6A, etc.). With the rechargeable nail puller 1 of this embodiment, which has a built-in rechargeable battery 66, it is possible to perform nail pulling work in a cordless state as a cordless hand tool. In addition, the side of the battery housing 13 opposite to the grip 12 is flat, and a rubber pad (not shown) can be attached as needed, and it is configured to be a mounting surface 13S when the device is placed in a stable position on the ground or floor when not in use (see Figures 1, 3, etc.). The battery housing 13 of this embodiment is further provided with a strap 132 and a belt hook 134 (see Figure 2, etc.).

[0027] Here, we will address the relationship between the descriptions in the drawings and the orientation of the rechargeable nail puller 1. The orientation (direction of the rechargeable nail puller 1) when actually using the rechargeable nail puller 1 of this embodiment for nail removal work (usage state) is not particularly limited. For example, if pulling out a nail P that has penetrated a wall horizontally, it is possible to use it with the hook member 20 and slider 30 (described in detail in a later section) in a horizontal orientation, similar to the placement state. If pulling out a nail P that has penetrated a ceiling straight down, it is possible to use it with the hook member 20 and slider 30 facing straight up. However, in actual use, it is assumed that the operation of pulling out nails P from board materials or frame materials such as concrete panels Q or battens R placed on the ground straight up is the usual procedure. In this specification and drawings, assuming such a typical scenario, the manner in which the hook member 20 and slider 30 are used with the hook member 20 and slider 30 facing downwards will be described as a representative example of use and referred to as the "usage state" (see Figure 2, etc.). Furthermore, for convenience, the upper side (the direction upward along the drive shaft DA) in the operating state will be referred to as "up," the lower side as "down," the side where the mechanism 11 is located from the user's perspective as "front," and the side where the battery housing 13 is located as "rear" (see Figure 7A, etc.).

[0028] The hook member 20 functions as a member that engages with a part of the workpiece (in this embodiment, the head of the nail P to be pulled out from a batten, etc. (nail head Ph)), and a hook (engaging part) 22 is 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 as they are viewed from below towards the front, similar to the tip of a normal nail puller (crowbar) (see Figure 5, etc.). Also, if the hook 22 is wedge-shaped and gradually thins in thickness as it is viewed from the side (left and right directions perpendicular to the front-to-back direction in the state of use), it is easier to hook onto the nail head Ph (see Figure 6B, etc.). The hook member 20 on which the hook 22 is formed is fixed to the main frame 14 of the mechanism 11 (see Figure 11, etc.). The hook member 20 is formed in a cylindrical shape, for example in this embodiment (see Figure 14A, etc.), and also functions as a guide member that guides the rod portion 32 of the slider 30 which slides in the vertical direction (this will be described later) (see Figure 13, etc.).

[0029] The main frame 14 is a frame formed in the mechanism 11 of the main body 10 so as to extend vertically (from top to bottom) along the drive shaft DA (see Figure 12, etc.). In this embodiment, a pair of left and right plate-shaped members arranged symmetrically on either side of the drive shaft DA are used as the main frame 14 (see Figures 9A, 9B, etc.). The upper end of the main frame 14 is attached to and fixed to the frame base 15 (see Figure 13, etc.). A hook member 20 is attached to the tip portion (lower portion) of the main frame 14 with fastening screws 24 from both sides, for example (see Figure 14A, etc.). The hook member 20, while fixed to the main frame 14, does not change its relative position in the vertical direction (along the drive shaft DA) within the mechanism 11. In addition to holding the fixed hook member 20, the main frame 14 also serves as a guide member that guides the slider 30 which slides vertically.

[0030] The slider (sliding member) 30 is a movable member that slides vertically to extend and retract relative to the main body 10, and functions like a leg (pusher or push rod), with a part of it (tip portion 31) moving relatively closer to and further away from the hook 22 of the hook member 20. By extending the slider 30 while the hook 22 of the hook member 20 is engaged with the nail head Ph, the hook 22 of the hook member 20 fixed to the main body 10 and the tip portion 31 of the slider 30 are moved relatively apart, and the nail P can be pulled out as a result of this movement (see Figures 7B, 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 bracing rod when pushing up the main body 10 along with the hook 22 against a nailed concrete panel Q or batten R, etc. (see Figure 16, etc.).

[0031] The specific configuration of the slider 30 is not particularly limited as long as it can function as described above, but in this embodiment, which is a preferred example, the slider has a configuration in which the tip portion 31, rod portion 32 and side cover portion 33 are integrated and slide vertically along the main frame 14 provided on the main body portion 10 (see Figure 14B, etc.). The slider 30 receives the driving force of the motor 60 via a drive mechanism 70 including a screw shaft 72 and moves linearly along the drive shaft DA.

[0032] The tip portion 31 consists of, for example, a roughly circular plate-like member formed at the bottom of the slider 30, and acts as a bracing portion that abuts against a concrete panel Q or a wooden batten R, relatively pushing up the main body portion 10 (see Figures 7A, 8A, etc.).

[0033] The rod portion 32 consists of a rod-shaped member extending along the drive shaft DA, and is integrated with the tip portion 31 at its lower end (see Figure 14B, etc.). The rod portion 32 is cylindrical so that the screw shaft 72 passes through its interior (see Figure 6A, etc.). In addition, a sleeve portion 32c having a female thread 32b that screws onto the screw shaft 72 is provided on the inner circumference of a part of the rod portion 32, for example, the upper flange portion 32a, so that the rod portion 32 and thus the entire slider 30 move linearly along the drive shaft DA as the screw shaft 72 rotates (see Figure 6B, etc.). The screw shaft 72, the female thread 32b, and the steel ball (not shown) interposed between the screw shaft 72 and the female thread 32b constitute a drive mechanism 70 for moving the slider 30 linearly, such as a ball screw (indicated by reference numeral 73 in Figure 9A, etc.) as in this embodiment. The rod portion 32 is formed such that its outer diameter is less than the inner diameter of the hook member 20, and is positioned inside the hook member 20. When it slides (moves linearly), it is guided by the inner circumferential surface of the hook member 20 (see Figures 10B, 13, etc.). The rod portion 32 is fastened and integrated with the side cover portion 33 at its lower end using a screw (countersunk cap bolt, etc.) 39 (see Figures 10B, 11, etc.).

[0034] The side cover portion 33 is made up of a member that constitutes the surrounding portion of the slider 30 (see Figure 14B, etc.). In this embodiment, the side cover portion 33 is provided so as to surround the main frame 14, and furthermore, both sides of the side cover portion 33 are formed so that their cross-sectional shape is channel-shaped, and the main frame 14 is sandwiched in the groove portion (see Figures 9A, 9B, etc.). The side cover portion 33 formed in this way slides (linear motion) along the drive shaft DA together with the tip portion 31 and the rod portion 32 while being guided by the main frame 14 (see Figure 12, etc.). A cover 50 is provided around the side cover portion 33.

[0035] The cover 50 consists of a cylindrical member provided on the mechanism 11 so as to surround the side cover portion 33 (see Figure 6A, etc.). In this embodiment, the cover 50 is provided so as to hide the portion of the slider 30 excluding the tip portion 31 when the slider 30 is retracted into the main body portion 10 (initial position) (see Figure 7B, etc.).

[0036] The motor 60 is provided as a power source to drive (perform linear motion) the slider 30, which is a movable part, via the drive mechanism 70. In this embodiment, the motor 60 is located in the main body 10, in an upper position within the mechanism 11 (see Figure 6A, etc.).

[0037] The drive mechanism 70 is configured to transmit power from the motor 60 to drive (in linear motion) the slider 30, which is a movable part. The drive mechanism 70 in this embodiment includes a reduction gear 71 and a ball screw 73 (see Figure 6A, etc.). Although not shown in particular detail, the reduction gear 71 includes a gear train that appropriately reduces the rotational speed of the motor 60 and transmits it to the screw shaft 72 of the ball screw 73. The screw shaft 72 is provided along the drive shaft DA and rotates to drive (in linear motion) the slider 30.

[0038] The control unit (control section) 90 is built into the main unit 10 as a device for controlling the motor 60. In this embodiment, the control unit 90 is connected to the motor 60 in a bidirectional manner 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 unit 92, and the battery housing unit 13 (which houses the battery 66) (see Figure 31). In addition, although not specifically shown, the control unit 90 is equipped with communication circuits, converter circuits, inverter circuits for communicating with these devices, and an MPU for controlling the communication circuits.

[0039] As described above, in this embodiment, the screw shaft 72 is provided along the drive shaft DA, and the reduction gear 71 is provided above the screw shaft 72 and on the extension of the drive shaft DA. Furthermore, the motor 60 is provided above the reduction gear 71 and on the extension of the drive shaft DA (see Figure 6A, etc.). As a result, in the rechargeable nail puller 1 of this embodiment, the motor 60 and the drive mechanism 70 (reduction gear 71, ball screw 73 and its screw shaft 72) are arranged in series on the same axis. This configuration, combined with the configuration that enables a low overall height of the rechargeable nail puller 1, contributes to improving handling and ease of aiming.

[0040] In other words, firstly, in a rechargeable nail puller 1 like this embodiment, where the hook member 20 is fixed rather than stroked as in the conventional design, and the slider 30 is stroked to move the hook member 20 relatively, there is no need to secure space inside the main body 10 for stroking the hook member 20. With this configuration, the overall height of the rechargeable nail puller 1 in use (however, in the retracted state where the slider 30 is pulled into the main body 10 and in its initial position) can be reduced by the length L1 (approximately equal to the stroke amount of the hook member 20) corresponding to the internal space required for the stroke of the hook member that would have had to be secured inside the main body 10 (however, it is possible to reduce the overall height by the length of the mechanism 11 along the drive shaft DA) (see Figures 15, 16, etc. In Figure 15(B), the conventional rechargeable nail puller is shown as a comparison object by reference numeral 1'). The height of the mechanism 11 in the initial position (retracted state) is indicated by the symbol L2 (the length from the tip 31 to the top of the mechanism 11 along the drive shaft DA) (see Figure 16).

[0041] Secondly, as described above, the reduced overall height makes it easier to position the motor 60 on the drive shaft DA (or its extension). For example, in the past, the motor 60 had to be offset within the handgrip 12 to avoid making the overall height too high, but in this embodiment, which achieves a reduced overall height, it can be positioned on the drive shaft DA (or its extension). In such cases, the handgrip 12 can be positioned closer to the mechanism 11 and the hook 22. When the handgrip 12 is close to the mechanism 11 and the hook 22 in this way, it contributes to easier handling and aiming during actual nail removal work, and in particular, makes it easier to reliably perform tasks such as hooking the hook 22 onto the nail head Ph. Moreover, since the force acting on the screw shaft 72 acts directly below (coaxially) the screw shaft 72 regardless of the position or orientation of the nail P, it is no longer necessary to place the hook 22 directly below the drive shaft DA, which also contributes to solving the problem of "difficulty in aiming at nails".

[0042] Furthermore, arranging the motor 60, reduction gear 71, and screw shaft 72 in close proximity in a straight line eliminates the need for the previous power transmission mechanism (such as bevel gears) that was located between them, resulting in a simpler structure and contributing to miniaturization and weight reduction. In addition, such a rechargeable nail puller 1 is convenient as it can be used in confined spaces.

[0043] Furthermore, when using a nail removal tool that strikes the nail shaft Pt to remove the nail P, the force of the strike can cause the removed nail P to scatter. However, with the rechargeable nail removal machine 1 of this embodiment as described above, it is possible to remove nails without them scattering.

[0044] Furthermore, in the case of the rechargeable nail puller 1 of this embodiment, where the main body 10 itself moves in a stroke during the nail pulling operation (that is, it moves together with the hook 22 to move away from the concrete panel Q, battens R, etc.) (see Figures 7A to 8B, etc.), there is also the advantage that the user can easily feel the nail pulling. In other words, with a conventional structure in which the hook slides within the main body, the user who is working with the rechargeable nail puller while holding it in their hand can only confirm the nail pulling operation by seeing it or hearing the sound of it, 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) during the nail pulling operation, making it easier to feel that the nail pulling operation has been performed and completed.

[0045] [Second Embodiment] As a second embodiment of the present invention, further features of the hook member 20 and hook 22 of the rechargeable nail puller 1 will be described. Note that other components of the rechargeable nail puller 1 that are common to those in the first embodiment will not be repeated in this description.

[0046] <Structure designed to mitigate the effects of uneven load distribution> In constructing the rechargeable nail puller 1 as described above, it is preferable to also consider the problem of "uneven load" acting on the drive shaft. In the conventional structure in which the nail P is pulled out by moving the hook 22', if the nail P is driven straight into the concrete panel Q or batten R, the force acting on the drive shaft when pulling out the nail P will not act in any direction other than the axial direction, so no uneven load (uneven load) will be applied (see Figures 17A and 17B). However, in reality, the nail P is often driven in at an angle (see Figure 17C), and when pulling out the nail P, the resistance to pulling out the nail occurs at a position offset from the drive shaft, and as a result, a lateral load acts on the drive shaft as an uneven load (see Figures 18A and 18B). In other words, the resistance when removing a nail occurs in the frictional resistance portion between the concrete panel Q or batten R, which is the driving member, and the nail P, more specifically in the portion of the nail P that penetrates the batten R, etc. (the area marked with fine dots in Figure 18B). Therefore, the reason why an uneven load acts on a nail P that is driven in at an angle as described above can be explained by the fact that the portion that generates such resistance (the penetrating portion of the nail P) is misaligned (offset) with respect to the drive shaft. When an uneven load is applied, the screw shaft 72' tilts, and as the amount of nail P is pulled out increases, the tilt also increases. As a result, uneven wear occurs due to the load acting on the bearing portion of the screw shaft 72', which can lead to a decrease in durability. Thus, since an uneven load occurs when the position of the drive shaft and the nail are misaligned, this is even more likely to happen if the hook 22 is positioned at an offset position from the drive shaft DA, as in this embodiment. To address these issues of uneven load distribution and minimize or eliminate their effects, one possible configuration in conventional mechanisms involves positioning the hook for catching the nail head on the drive shaft to prevent uneven load distribution. However, while such a configuration may improve durability, it has the disadvantage of making it difficult to see (and aim at) the tip of the nail. Furthermore, it cannot avoid the uneven load distribution that occurs when removing nails that have penetrated at an angle. In this embodiment, which takes various issues into comprehensive consideration, the tip of the nail is easy to see (easy to aim) and a rigid structure is adopted that is less susceptible to the effects of uneven loads. In other words, the hook, which is subjected to oblique or lateral loads, is supported not by a screw shaft that generates driving force, but by a main frame 14 with high rigidity. In addition, a guide member is provided to guide the sliding of the slider 30, which is a movable part, so that eccentric loads do not act on the female thread 32b. This eliminates the need to place the hook 22 directly below (on the extension of) the drive shaft DA, thus allowing the hook 22 to be positioned offset and solving the problem of "difficulty aiming at the nails."

[0047] <Offset placement of hooks> The hook 22 of the hook member 20 is positioned offset from the drive shaft DA (see Figure 10A, etc.). In this embodiment, the hook 22 of the hook member 20 is formed to protrude in a direction perpendicular to the drive shaft DA and faces horizontally when in use (see Figure 6A, etc.). In addition, at least a part of the hook 22 is provided to be visible from the outside of the cover 50 (see Figure 5, etc.). The advantages of the above configuration are as follows. In other words, in some conventional cordless nail pullers, the hook 22' is positioned directly below the screw shaft 72' of a ball screw or the like (in other words, on the extension of the drive shaft DA) (see Figures 30A and 30B). However, in this case, the hook 22' is difficult to see and its position is difficult to grasp, making it difficult to hook the hook 22' onto the nail head Ph. In this regard, with the rechargeable nail puller 1 in which the hook 22 is offset as in this embodiment, the hook 22 is easier for the user to see because it is offset from the drive shaft DA, and the task of hooking the hook 22 onto the nail head Ph is easier (see Figures 7A, 7B, etc.).

[0048] <Protruding leg at the tip of the slider> Furthermore, in this embodiment, as the hook 22 is offset as described above, the slider 30, particularly its tip 31, is structured to be suitable for the offset placement of the hook 22. That is, (1) The tip portion 31 of the slider 30 is provided with a protruding leg portion 35 that protrudes in a direction perpendicular to the drive shaft DA (see Figure 10A, etc.). The protruding leg portion 35 is formed to be large and shaped in a way that eliminates the influence of external forces (moments) that may act when pulling out the nail P with the offset-positioned hook 22. As a preferred example, in this embodiment, a pair of protruding legs 35 are provided on the tip portion 31, which are large enough to protrude sufficiently compared to the hook 22 (see Figure 19A, etc.) and are symmetrically arranged on the left and right sides (see Figure 5, etc.). The length from the drive shaft DA to the tip of the hook 22 is L4, and the protruding leg portion 35 is located further forward by a length L5 (see Figure 19B). The pair of protruding legs 35 are spaced wider apart than the hook 22 so that the hook 22 of the hook member 20 can be positioned between them (see Figure 7B, etc.). (2) A flat surface 31f is formed at the tip 31 of the slider 30 that contacts the concrete panel Q, battens R, etc. (see Figure 19A, etc.). This flat surface 31f is at least large in size and shape sufficient to eliminate the influence of external forces (moments) that may act when pulling out the nail P with the offset-positioned hook 22. In this embodiment, a flat surface 31f is formed that extends further forward beyond the offset amount Los of the hook 22 (in this specification, the distance between the virtual central axis Pc and the drive shaft DA when it is assumed that the nail P hung on the hook 22 is straight) (in other words, the length L3 from the drive shaft DA to the front end of the flat surface 31f is sufficiently long compared to the offset amount Los), thereby widening the contact area (ground contact area) with the concrete panel Q, battens R, etc. (see Figure 19B, etc.). It goes without saying that the entire or most of the lower surface of the protruding leg portion 35 described above may be made flat.

[0049] <Rotating structure such as hooks> As described above, when the hook 22 is offset and protrudes perpendicular to the drive shaft DA, it is preferable to make the hook 22 rotatable (swivel) around the drive shaft DA. This reduces operational constraints, such as having to use the rechargeable nail puller 1 in a fixed orientation, as would be the case if the hook 22 always faced in one direction, and further improves ease of use (see Figures 20A, 20B, etc.). In this embodiment, a rotatable portion 21 and an O-ring 26 are provided at the lower tip of the hook member 20, allowing the orientation of the hook 22 formed on this rotatable portion 21 to be changed (see Figures 21A, 21B, 22A, etc.). The specific configuration of the rotatable portion 21 is not particularly limited. As an example, in this embodiment, an annular rotatable portion 21, which has a larger diameter than the cylindrical portion 23, is provided at the lower tip of the cylindrical portion (indicated by reference numeral 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 shaft DA (see Figures 22A, 23B, etc.).

[0050] The O-ring 26 is an annular member, for example, made of rubber, provided between the rotatable portion 21 and the cylindrical portion 23 (see Figure 23B, etc.). This O-ring 26 functions as a resistor that provides a predetermined resistance to the rotational movement of the rotatable portion 21 around the drive shaft DA, allowing relative rotation of the rotatable portion 21 while preventing the rotatable portion 21 from unexpectedly rotating after the orientation of the hook 22 has been changed.

[0051] In this embodiment of the rechargeable nail puller 1, not only the hook 22 but also the orientation of the protruding leg portion 35 of the slider 30 can be changed. 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 and an O-ring 38 are provided between them to allow relative rotation, so that the tip portion 31, the side cover portion 33 and the protruding leg portion 35 can rotate (swivel) together relative to the rod portion 32 (see Figure 24B, etc.). The rotatable portion 34 can be made of, for example, a screw that rotatably attaches the tip portion 31 to the lower end of the rod portion 32 (see Figure 24B, etc.).

[0052] The O-ring 38 is an annular member, for example made of rubber, provided between the rod portion 32 and the tip portion 31 (see Figure 24B, etc.). This O-ring 38 functions as a resistor that provides a predetermined resistance to the rotational movement of the tip portion 31 and other parts around the drive shaft DA, allowing relative rotation of the tip portion 31 and other parts, while preventing the protruding leg portion 35 or the tip portion 31 from unexpectedly rotating after the orientation of the protruding leg portion 35 has been changed.

[0053] Furthermore, in this embodiment, when the slider 30 is in its initial position retracted into the main body 10, the protruding leg 35 and the hook 22 are formed such that at least a portion of them overlap each other with respect to the axial direction of the drive shaft DA (see Figure 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 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 also be rotated by the same amount. For example, if you want to change the orientation of the hook 22 depending on the position and shape of the nail P, you can simply rotate the outer protruding leg 35 to change the orientation of the hook 22 at the same time (see Figures 22A, 22B, etc.). Also, the fact that the protruding leg 35 and the hook 22 are always facing the same direction means that when pulling out the nail P, the protruding leg 35 is always in a position directly below the hook 22 (see Figures 24A, 24B, etc.). Therefore, regardless of the orientation of the hook 22, any 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, thereby eliminating its effect.

[0054] <Structure for returning the orientation of the hook and protruding leg> Furthermore, in this embodiment, even if the orientation of the hook 22 and the protruding leg 35 is changed during nail removal work, a mechanism is in place to return the orientation of the hook 22 and the protruding leg 35 to their original position (facing forward in this embodiment) after the work is completed (see Figures 22A, 23A, etc.). Such a mechanism can be configured, for example, with a device including a guide member that rotates the slider 30 and the rotatable portion 21 of the hook member 20 by a predetermined amount so that the hook 22 and the protruding leg 35 face forward, while the slider 30 returns from the state in which it protrudes the most from the main body 10 to remove the nail P (protruding state) (see Figures 24B, 24C, etc.) to the initial position in which it is retracted (see Figure 23B, etc.). (For example, a device consisting of a combination of a spiral guide and a projection guided along the guide, which defines the circumferential position of the protruding leg 35 of the slider 30 and the rotatable portion 21 of the hook member 20 in conjunction with the upward sliding operation when the slider 30 returns to the initial position.)

[0055] <Structure for clamping components> The rechargeable nail puller 1, equipped with the hook 22 and protruding leg 35 as described above, is primarily used for nail removal, but can also be used as a clamping device to clamp members positioned perpendicular to the drive shaft DA. For example, when clamping the battens of two concrete panels Q together to bring them into contact without any gaps, these battens R can be clamped between the lower surface of the hook 22 and the upper surface of the protruding leg 35 (see Figures 29A and 29B). In such applications, the hook 22 and protruding leg 35 can be said to function as holding parts that clamp the member to be clamped and maintain that position.

[0056] The rechargeable nail puller 1 of this embodiment, while being a single power tool, enables practical uses beyond nail pulling. This also addresses the potential demand on construction sites where it is often considered costly and difficult to acquire different tools for each task.

[0057] [Third Embodiment] As a third embodiment of the present invention, a rechargeable nail puller 1 that can also be used for demolition work on concrete panels Q and battens R, and has further improved convenience, will be described. 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 and driving in the pointed portion, separation work on board materials or frame materials such as concrete panels Q and battens R can be easily performed (see Figure 25A, etc.).

[0058] <Structure suitable for dismantling materials such as boards> In this embodiment, a tapered portion 36 is formed on a part of the protruding leg portion 35 of the slider 30 (see Figure 25A, etc.). The tapered portion 36 is a wedge-shaped tapered portion that faces away from the drive shaft DA. For example, in this embodiment, it is formed so as to face perpendicular to the drive shaft DA on the portion that faces forward when the retracted state is the initial position of the rechargeable nail puller 1 (see Figure 25A, etc.). The shape of the tapered portion 36 is not particularly limited as long as it is tapered. As in this embodiment, both the upper surface 36t and the lower surface 36b may be inclined surfaces (see Figure 25C, etc.), or only one of them may be an inclined surface, with the other surface being horizontal in use. Furthermore, the upper surface 36t and the lower surface 36b may be flat surfaces or gently curved surfaces. In short, the slider 30 should be struck to create a wedge shape that applies a force to separate the concrete panel Q, batten R, or other board or frame material when the tapered section 36 is driven in.

[0059] In this embodiment, the tapered portion 36 is provided at the leading ends of a pair of left and right protruding legs 35, and is formed in a symmetrical shape with respect to a virtual plane (indicated by the symbol VP in Figure 4) that includes the drive shaft DA. Furthermore, the left and right tapered sections 36 are spaced apart so that the hook of the hook member 20 fits between them (see Figure 7B, etc.).

[0060] Of the slider 30, the striking portion 37 is formed on the side opposite to the tapered portion 36 when the drive shaft DA is used as a reference (the rear side in the operating state) (see Figure 25B, etc.). In this embodiment, by making the striking portion 37 protruding toward the side opposite to the tapered portion 36 when the drive shaft DA is used as a reference, the user is shown the location to be struck with the hammer 300 in an easy-to-understand manner, and the hammer 300 is prevented from striking the cover 50 of the rechargeable nail puller 1 when striking (see Figure 26, etc.). In particular, considering the latter point, the slider 30 may be formed so that the striking portion 37 protrudes sufficiently beyond the surface of the cover 50 (see Figure 25C, etc.).

[0061] At least the portion of the slider 30 used for striking (including the tapered portion 36 and the portion to be struck 37) is made of a material with sufficient rigidity to withstand the impact. This portion may be made of metal, such as cast iron. Alternatively, this portion may be made of a detachable attachment (indicated by reference numeral 40 in Figure 25B). If a detachable attachment 40 with a tapered portion 36 and a portion to be struck 37 is used, the tapered portion 36 and the portion to be struck 37 can be easily replaced if they are damaged. The entire attachment 40 may be made of metal, such as cast iron. The attachment 40 may be rotatably mounted around the drive shaft DA on the rod portion 32 of the slider 30.

[0062] Furthermore, in this embodiment, the tapered portion 36 formed on the slider 30 as described above is made such that its tip 36a is located outside the hook 22 of the hook member 20 (in other words, it is located further away 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, when viewed from the side, the hook 22 is hidden within the projection plane of the protruding leg portion 35 or its tapered portion 36) (see Figure 25C, etc.). By making the tapered portion 36 larger than the hook 22 and positioning it further forward in this way, it is possible to avoid the hook 22 acting as resistance when inserting the tapered portion 36 into the gap between the concrete panel Q and the batten R, for example.

[0063] With the rechargeable nail puller 1 described above, the tapered portion 36 can be inserted into the gap between, for example, a concrete panel Q and a batten R, and the striking portion 37 can be struck with a hammer 300. This allows the striking force to widen the gap between the concrete panel Q and the batten R, just as if a crowbar were being used (see Figure 26, etc.). By sliding the slider 30 with the hook 22 and protruding leg 35 deeply inserted in this manner, the gap between the concrete panel Q and the batten R can be further widened, making separation easier (see Figures 27A, 27B, 27C, etc.). Furthermore, if the nail head Ph is slightly raised from the concrete panel Q or batten R but is firmly embedded, making it difficult to hook the hook 22 onto the nail head Ph, the striking portion 37 can be struck with the hammer 300 to gradually push the hook member 20 forward, thereby ensuring that the hook 22 is fully engaged with the nail head Ph.

[0064] <How to use nails to lift them off boards or other materials> The rechargeable nail puller 1, configured as described above, can also be used to loosen nails P that are embedded in board materials or frame materials such as concrete panels Q or battens R (see Figure 28A, etc.).

[0065] Nails P driven in during formwork panel work are often driven with their heads Ph slightly raised to allow for demolition after the concrete has hardened. However, there may be cases where the raised portion is insufficient, making it difficult to hook the hooks 22. In such cases, it is convenient to raise the nails P even further. In this case, the rechargeable nail puller 1 can be used to raise the nails P even further. Specifically, for example, when a nail P remains embedded in a concrete panel Q separated from a batten (see Figure 28E(a)), first, a push-down tool 400 is pre-installed between a pair of left and right hooks 22. The slider 30 is slid to protrude the protruding leg 35, which is then placed against the surface of the concrete panel Q (the side with the nail head Ph), and the push-down tool 400 is used to push down the nail leg Pt (see Figures 28A, 28B, 28C, 28D, and 28E(b)). If the nail P is removed with the rechargeable nail puller 1 when the nail head Ph is lifted from the surface of the concrete panel Q (see Figure 28E(c)) (see Figure 28E(d)), smooth and efficient work may be possible. The push-down tool 400 only needs to be able to push down the tip of the nail foot Pt, and a detachable jig can be used, for example, attached to the hook 22.

[0066] The rechargeable nail puller 1 of this embodiment allows for practical uses beyond nail removal, despite being a single power tool. This also addresses the potential demand on construction sites, where it is often considered costly and cumbersome to have different tools for each task.

[0067] [Fourth Embodiment] As a fourth embodiment of the present invention, various operations of the rechargeable nail puller 1 and their control will be described (see Figures 31, 32A, etc.).

[0068] <Control device> The control device 90 causes the slider (sliding member) 30 to perform a predetermined operation using the motor (drive source) 60 in response to a trigger signal input from an external source.

[0069] <Origin Sensor> The origin sensor 80 is provided as a means for detecting that the slider 30 is in its initial position. The origin sensor 80 may be an optical sensor or the like that detects the position of the slider 30 on the drive shaft DA. Alternatively, the origin sensor 80 may determine the position or amount of movement of the slider 30 based on the amount of rotation of the motor 60. Or, the origin sensor 80 may be composed of a switch that is positioned to detect that the slider 30 is in a predetermined position when it comes into contact with the slider 30.

[0070] <Operating Mode> The rechargeable nail puller 1 of this embodiment has multiple operating modes that can be selected to operate the slider 30 according to the content of the work on the work object. The operating modes are various operating methods that the user can select according to how the rechargeable nail puller 1 moves when pulling nails, or according to the manner or desired operation when used for purposes other than nail pulling. In the rechargeable nail puller 1 of this embodiment, there are "nail pulling mode," "nail pulling 1 cycle mode," and "clamp mode" that the user can select by operating the mode operation / display unit (indicated by reference numeral 92 in Figure 31) for operating the mode.

[0071] <Flowchart of nail removal operation> An example of the operation flow for controlling the nail removal operation in the rechargeable nail puller 1 is described below (see Figures 34 and 35).

[0072] After turning on the main power (step SP301), the operating mode is selected (step SP303). For nail removal applications, there are two operating modes, "nail removal mode" and "nail removal 1-cycle mode," which can be selected by the user by operating the mode selection switch (not shown) to allow the user to choose how the rechargeable nail remover 1 moves during nail removal, according to the type of nail removal to be performed and the desired operation.

[0073] <Nail removal operation flow (nail removal mode)> If "nail removal mode" is selected in step SP303, the initial position drive operation is performed first (step SP311). This is a series of automatic operations to detect the position of the drive unit of the slider 30 as described above and move the position of the slider 30 to a predetermined initial position. If a mode change is instructed, the slider 30 will move to a different initial position for each mode, but if there is no mode change, this step may be skipped.

[0074] After the initial position drive operation (step SP311), the setting of the amount of movement is reflected (step SP312). This step is for appropriately setting the amount of movement (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. If a switch is used, the switch can be anything such as a tact switch or a dial switch. Although a detailed explanation is omitted, it may be possible to select "auto" which sets the amount of movement automatically, or "standard" which sets a standard amount of movement. The amount of movement (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.

[0075] While the trigger OFF signal is input, steps SP303, SP311, SP312, and SP313 are performed continuously, and when the trigger is turned ON, the nail removal operation begins (step SP314).

[0076] In the nail-pulling operation step, the motor 60 is driven in the forward direction to move the slider 30 in the direction that it protrudes from the main body 10 (i.e., the nail-pulling operation direction described above) (step SP314). When the amount of movement of the slider 30 reaches a preset amount (step SP312) (step SP315), the motor 60 is stopped to stop the driving of the slider 30 (step SP316). After stopping the driving of the slider 30, the device waits until the trigger is turned OFF (step SP317). That is, the device waits from the state where the trigger switch 122 is held down by the user's finger (trigger ON state) until the finger is released (or the force holding the switch is released) and the trigger switch 122 returns to its original state (trigger OFF state). Once the trigger signal is turned off (i.e., the trigger is OFF state), the motor 60 is reversed to move the slider 30 back to its initial position (in the direction that it is pulled into the main body 10) (step SP318). When the slider 30 returns to its initial position (step SP319), the motor 60 and the slider 30 are stopped (step SP320), ending the series of operations (nail removal mode). After the series of operations is completed, the system returns to step SP303 to prepare for the next nail removal operation and performs the same operations as described above in response to input (see Figure 34). As described above, in nail removal mode, the slider 30 is made to perform predetermined operations in response to an externally input trigger signal, such as sliding the slider 30 by a predetermined length when the trigger signal is turned on.

[0077] <Nail removal operation flow (1-cycle nail removal mode)> The operation flow when "Nail Removal 1-Cycle Mode" is selected in step SP303 is explained below (see Figure 35, etc.). In "Nail Removal 1-Cycle Mode," the initial position drive operation is performed (step SP321), followed by operation amount setting (step SP322), trigger ON standby (step SP323), nail removal operation (step SP324), reaching the set operation amount (step SP325), and drive stop (step SP326) in sequence (see Figure 35). Each of these operations is the same as those in steps SP311 to SP316 in the "Nail Removal Mode" described above (see Figures 34 and 35).

[0078] After this, in the nail-pulling 1-cycle mode, regardless of the state of the trigger switch 122 (trigger ON or trigger OFF), the motor 60 is reversed to move the slider 30 back to its initial position (step SP327), and it is not held in the extended position. Once the slider 30 returns to its initial position (step SP328), the motor 60 and the slider 30 are stopped (step SP329). After the drive is stopped, the system waits until the trigger is turned OFF (step SP330), and once the trigger switch 122 returns from being pulled by the user's finger (trigger ON state) to its original state (trigger OFF state), the system returns to step SP303 to prepare for the next nail-pulling operation (see Figures 34 and 35). As described above, in the nail-pulling 1-cycle mode, when the trigger signal is turned ON, the slider 30 is slid by a predetermined length and then returned to its initial position.

[0079] <Nail removal + clamp operation flow> The rechargeable nail puller 1 may be designed to perform both nail pulling and clamping operations. An example of the operation flow when both nail pulling and clamping operations are performed in this way is explained below (see Figures 36A to 36C).

[0080] After turning on the main power (step SP501), select one of the following operating modes: "nail removal mode," "nail removal 1-cycle mode," or "clamp mode" (step SP503). The operation flow when "nail removal mode" is selected (steps SP511-SP520, see Figure 36A) is the same as that for "nail removal mode" (see Figure 34) described above, and the operation flow when "nail removal 1-cycle mode" is selected (steps SP521-SP530, see Figure 36B) is the same as that for "nail removal 1-cycle mode" (see Figure 35) described above, so it will not be explained here. An example of the operation flow when "clamp mode" is selected is described below (see Figure 36C).

[0081] <Clamp operation flow (clamp mode)> If "Clamp Mode" is selected in step SP503, the motor 60 is driven forward to drive the slider 30 to the position where it protrudes the furthest from the main body 10 (hereinafter also referred to as the "maximum extension position") (step SP531), and the system waits until the trigger switch 122 is pulled and the "Trigger ON" signal is transmitted (step SP532). Once the trigger is ON, the motor 60 is reversed to start the clamping operation (the operation of clamping the work object, such as the battens of a concrete panel Q, between the hook 22 and the protruding leg 35) (step SP533). After the clamping operation has started, if a predetermined load (clamping load) occurs before the slider 30 reaches its initial position (NO in step SP534, YES in step SP535), the motor 60 and slider 30 are stopped at that point (step SP536), and the system waits until the trigger is OFF while maintaining the clamped state of the work object (step SP537). In other words, the system waits from the state where the trigger switch 122 is held down by the user's finger (trigger ON state) until the finger is released (or the force holding the switch is released) and the trigger switch 122 returns to its original state (trigger OFF state). Once the trigger is OFF, the system waits until the trigger switch 122 is pulled down and the trigger is ON (step SP538). When the trigger is ON, the motor 60 is driven to rotate forward again to return the slider 30 to its maximum extended position (step SP540). Once the slider 30 reaches its maximum extended position (step SP541), the motor 60 and the slider 30 are stopped (step SP542). After that, the system waits until the trigger is OFF (step SP543), and once the trigger is OFF, the system returns to the step of selecting the operating mode (step SP503).

[0082] Furthermore, if the slider 30 reaches its initial position in step SP534 (YES in step SP534), it is determined that the workpiece or other object was not clamped while the slider 30 moved from its maximum extension position to its initial position, and the system proceeds to step SP539 to stop driving (see Figure 36C).

[0083] Furthermore, the load acting on the slider 30 and motor 60 during the operation of the slider 30 can be detected based on the current value of the motor 60. For reference, here is an example of the current waveform of the motor 60 when the motor 60 is driven in reverse during clamp mode (see Figure 37). The current value when the work object is clamped is greater than the current value when the motor 60 is driven in reverse during nail removal mode (specifically, when the slider 30 is returned to its initial position after the nail removal operation (step SP518) (see Figure 36A)). Therefore, if a threshold current C1 is set during reverse drive in nail removal mode, by setting a value C2 that is greater than the above current C1 as the threshold current during reverse drive in clamp mode, it is possible to detect that the clamp operation has been completed based on the threshold current C2 (see Figure 37).

[0084] <Operation flow for initial position detection (in the case of sensorless operation)> Next, we will explain the operation flow for positioning the slider 30 and other components to their initial positions in accordance with the trigger signal in the rechargeable nail puller 1. Here, we will explain three types of patterns for the rechargeable nail puller 1, which is sensorless, meaning it does not have a sensor to detect the position of the slider 30: Pattern 1, where there is no room for material pinching; Pattern 2, where there is room for material pinching but the operation ends normally; and Pattern 3, where material pinching occurs and the operation ends abnormally (see Figures 32A to 32D). The flows representing each of the three types of operations, Patterns 1 to 3, are shown in Figure 32A. In Figures 32B to 32D, any part of the slider 30 is designated as the "movable part," and this part is indicated by a white triangle symbol, showing the movement of the slider 30 and the amount of movement. Note that the movement of the slider 30 sliding relative to the main body 10 of the rechargeable nail puller 1 (towards the bottom of the rechargeable nail puller 1) (see Figure 7B, etc.) is represented in Figures 32B to 32D as movement to the right (direction of nail pulling operation). Furthermore, in the diagrams, the same numbers are indicated in parentheses where there is a connection between the operations in the flow (see Figure 32A) and the operations in each pattern (see Figures 32B to 32D).

[0085] <Operation flow for initial position detection (sensorless case) (Pattern 1)> In the rechargeable nail puller 1, when the main power is turned on (step SP101), the operation flow for detecting the initial position of the slider 30 starts, using this as the initial trigger (see Figures 32A and 32B). Once the trigger signal is turned on and the flow starts, first the motor 60 is driven in reverse (step SP110), and it is determined whether 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 side limit position") (step SP111). If a high load is detected (YES in step SP111), the motor 60 is driven in forward (step SP141), and it is determined whether the slider 30 has moved a predetermined amount corresponding to the initial positioning predetermined amount X0 (step SP142).

[0086] Here, "initial positioning specified amount X0" refers to the amount equivalent to the difference between the "target initial position W0" where the slider 30 should be at the start of operation and the "reverse side limit position W1" mentioned above (see Figure 32B). In this embodiment, the slider 30 is first pulled back to the reverse side limit position W1, and then slid by a predetermined length corresponding to the initial positioning specified amount X0 to position the slider 30 at the target initial position W0 (positioning the slider 30). Specifically, when it is detected that the slider 30 has moved from the "reverse side limit position W1" by the "initial positioning specified amount X0" (YES in step SP142), the motor 60 is stopped as to indicate that the slider 30 has reached the "target initial position W0" (step SP143), completing the series of initial position detection operations (step SP144), and then the system transitions to normal control (control associated with operations such as nail removal) (step SP150).

[0087] <Operation flow for initial position detection (sensorless case) (Pattern 2)> Pattern 2, shown below, describes the operation flow when there is room for some kind of material to get caught in the slider 30 during its movement associated with initial position detection (see Figures 32A, 32C, etc.).

[0088] Steps SP101 to SP111 are the same as in Pattern 1 above (see Figure 32A). In step SP111, if "high load is not detected when the motor hits the reverse-side limit position W1" (NO in step SP111), it is determined whether the moving part has moved by a specified amount X1 (whether it has entered the main body 10) (step SP121). The specified amount X1 here is different from the initial positioning specified amount X0 mentioned above. The flow returns to step SP111 until the amount of movement of the moving part reaches this specified amount X1 (NO in step SP121). Once the amount of movement of the moving 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 the direction of protruding from the main body 10, and it is determined whether a high load is detected at the forward-side limit position W2 (step SP123). The forward rotation limit position W2 referred to here is the position where the slider 30 cannot slide any further in the direction in which it protrudes (see Figure 32C), and is the end of the stroke width of the slider 30. Here, the system waits until a high load exceeding a predetermined value is detected, and once detected, it is determined that the slider 30 has reached the forward rotation limit position W2, and the system proceeds to step SP124 (see Figure 32A).

[0089] In step SP124, the motor 60 is reversed, and the slider 30 is moved in the direction of being pulled into the main body 10. Then, it is determined whether a high load is detected at the reverse-side limit position W1 (step SP125). Here, the system waits until a high load exceeding a predetermined value is detected, and if detected, it is determined that the slider 30 has reached the reverse-side limit position W1.

[0090] Next, slider 30 is set to the abnormality prevention specified amount X ap Determine whether movement occurred (Step SP126). Abnormality prevention specified amount X apX is a quantity set as an indicator to determine whether any abnormalities occurred during the movement of the slider 30 (in this embodiment, from the forward rotation limit position W2 to the reverse rotation limit position W1), such as the slider 30 getting caught on something or getting a foreign object stuck in it. For example, it is set as a quantity that accounts for a predetermined percentage of the stroke width of the slider 30 (see Figure 32C). In this step SP126, the slider 30 is set to the abnormality prevention specified amount X. ap If the slider moves beyond the specified amount, it is determined that no abnormalities were detected in the series of operations up to this point, and the process proceeds to step SP141 described above. From step SP141 onward, the same operations as in pattern 1 described above are performed (steps SP141 to SP144, step SP150). Meanwhile, in step SP126, the slider 30 is set to the abnormality prevention specified amount X. ap If no further movement occurs, proceed to step SP131 (see Figure 32A). Step SP131 will be explained in Pattern 3 below.

[0091] <Operation flow for initial position detection (sensorless case) (Pattern 3)> In Pattern 3 shown below, primarily, in step SP126 described above, the slider 30 is set to an abnormality prevention specified amount X ap The flow in the case where no movement occurs is explained (see Figures 32A, 32D, etc.). In this step SP126, the slider 30 is set to the abnormality prevention specified amount X. ap If the slider does not move beyond the specified range, it is determined that an abnormal lock has occurred due to the slider 30 getting caught on something or becoming jammed with a foreign object while moving from the forward limit position W2 to the reverse limit position W1 (step SP131). In this case, the operation flow for initial position detection is terminated. The abnormal lock may also be indicated to the user by lighting a lamp on the main body 10 of the rechargeable nail puller 1 or by sounding a buzzer.

[0092] <Operation flow for initial position detection (when a sensor is present)> Next, another form of the operation flow for positioning the slider 30 etc. to the initial position in accordance with the trigger signal in the charging nail puller 1 will be described. Hereinafter, in the charging nail puller 1 provided with a position detection sensor, "operating part position < origin position W" op " starts detection in pattern 1, "origin position W" op "< operating part position" starts detection in pattern 2, and "operating part position = origin position W" op " starts detection in pattern 3 will be described (see FIGS. 33A to 33D). Note that the flows representing the operations of the three patterns 1 to 3 are 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 the present embodiment, as the detection sensor, a sensor (for example, the origin sensor indicated by reference numeral 80 in FIG. 31) for detecting whether the operating part is at the origin position W op is used for position detection. Although specific examples of what is assumed to be used as the detection sensor are not limited, if an example is given, there is a non-contact Hall IC for detecting a magnet attached to the slider 30.

[0093] In the charging nail puller 1, when the main power supply is turned on (step SP201), the operation flow for detecting the initial position of the slider 30 starts with this as the first trigger (see FIGS. 33A and 33B). When the trigger signal becomes on and the flow starts in this way, the state of the origin sensor is confirmed, and it is determined whether the origin sensor has detected the operating part of the slider 30 or is in a non-detection state (step SP203). If it is in a non-detection state, first, the operation flow proceeds according to pattern 1 (see FIG. 33A).

[0094] <Operation flow of initial position detection (when there is a sensor) (Pattern 1)> In Pattern 1, the motor 60 is first driven in the forward direction (step SP211), moving the slider 30 in the direction that protrudes from the main body 10 (nail pulling direction) (see Figure 33A). After that, the system waits to see if the origin sensor detects the moving part (step SP212). If it detects, the system proceeds to step SP213. On the other hand, if the moving part of the slider 30 moves by a specified amount without detection, the system proceeds according to the operation flow of Pattern 2, which will be described later.

[0095] Once the origin sensor detects the moving part (step SP212), it then waits until the origin sensor no longer detects the moving part (step SP213). When the slider 30 is moved and the moving part is no longer detected, the moving part returns to the origin position W. op When it is determined that the slider 30 has moved past the point (see Figure 33B), the motor 60 is reversed at this point (step SP214), and the slider 30 is moved in the direction of being pulled back. After that, when the origin sensor detects the moving part (step SP215), the origin position W op The moving part, having passed through, returns to the origin position W. op It is determined that the motor has returned to its original position, and in this embodiment, the motor 60 is stopped (step SP241), a series of initial position detection operations are completed in that state (step SP242), and then the system transitions to normal control (control associated with operations such as nail removal) (step SP250).

[0096] <Operation flow for initial position detection (with sensor) (Pattern 2)> In Pattern 1 above, at the time the main power is turned on (initial trigger), the operating part position is less than the origin position W. op ”(Origin position W op This pattern was designed to handle the case where the moving part is located in the direction of the nail extraction operation, but in the middle of the operation flow, at the time of the initial trigger, the opposite is actually true, "origin position W op <Moving part position> (The moving part is at the origin position W) op If it is determined that the nail is located in the direction of the nail extraction operation, proceed with the operation flow of Pattern 2 described below (see Figures 33A and 33C).

[0097] In other words, after the motor is driven in the forward direction (step SP211), in step SP212, while waiting 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 detection (see Figure 33C), the motor 60 is reversed (step SP222) to move the slider 30 in the direction of pulling it back. After that, when the origin sensor detects the moving part (step SP223), the original "origin position W op The moving part, which was in the "moving part position", is now at the origin position W. op After determining that the motor is in the correct position, the motor 60 is stopped (step SP241), a series of initial position detection operations are completed (step SP242), and then the system transitions to normal control (step SP250).

[0098] <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) is performed to proceed with the operation flow according to pattern 3 (see Figures 33A and 33D). In pattern 3, first the motor 60 is driven in the forward direction (step SP231), and the slider 30 is moved in the direction of protruding from the main body 10 (nail pulling direction), and the system waits until the origin sensor is in a non-detection state (step SP232). If the system is in a non-detection state, the motor 60 is reversed (step SP233), and the slider 30 is moved in the direction of pulling it back. After that, the system waits until the origin sensor detects the moving part (step SP234). Once the origin sensor detects the moving part, the system returns to the origin position W op The moving part, having passed through, returns to the origin position W. op The system determines that the motor has returned to its original position and stops the motor 60 (step SP241). In this state, it completes a series of initial position detection operations (step SP242) and then transitions to normal control (step SP250).

[0099] <Operation flow of nail removal + initial position detection + clamping> The nail removal and clamping operation described above may also include an initial position detection operation after the trigger is turned ON. An example of the operation flow in this case is explained below (see Figures 38A to 38C). In the following explanation, the differences from the nail removal and clamping operation flow described above (see Figures 36A to 36C) will be the main focus.

[0100] In this operation flow, after the main power is turned on (step SP601), the initial position of the slider 30 is detected (step SP602). If there is no sensor, the initial position is detected as described in the "Operation Flow for Initial Position Detection (Sensorless Case)" (see Figures 32A to 32D) above, and if there is a sensor, the initial position is detected as described in the "Operation Flow for Initial Position Detection (With Sensor)" (see Figures 33A to 33D) above. After that, the nail removal operation or clamping operation is performed as described in the "Operation Flow for Nail Removal + Clamping" (see Figures 36A to 36C) above (see Figures 38A to 38C).

[0101] The above-described embodiment is merely one example of a preferred implementation of the present invention, and is not limited thereto. Various modifications are possible without departing from the spirit of the present invention. For example, in the above embodiment, a structure was described in which the hook member 20 (the hook 22) is operated relatively by sliding only the slider 30 (a structure in which the hook 22 is fixed relatively to the main body 10), but a structure in which both the slider 30 and the hook member 20 are operated simultaneously is also possible. Although not specifically shown here, for example, a rack and pinion mechanism or the like may be used to link the slider 30 and the hook member 20, or the hook member 20 may be configured to slide in the opposite direction by an interlocking mechanism that is linked to the protruding movement of the slider 30.

[0102] Furthermore, although the above embodiment describes a rechargeable nail puller 1 using a motor 60 as a drive source (see Figure 6B, etc.), this is merely one example of a preferred configuration. Although not specifically shown in the figures, various types of powered nail pullers can be constructed, such as electric nail pullers using a motor as a drive source, compressed air nail pullers using an air motor, hydraulic nail pullers using a hydraulic motor, and various power tools using an AC electric motor as a drive source. Alternatively, the slider 30 may be driven by an air cylinder, or a drive mechanism 70 using a trapezoidal screw instead of a ball screw 73 may be constructed. Alternatively, a rack and pinion or worm gear may be used to convert the rotation of the motor 60 into linear motion. [Industrial applicability]

[0103] This invention is suitable for application to various power-driven tools, including electric nail pullers. [Explanation of Symbols]

[0104] 1…Chargeable nail puller (power tool) 10...Main body 11... Mechanism section 12…Hand grip (grip part) 13…Battery housing 13S… Mounting surface 14…Main frame (guide member) 15…Frame base 20…Hook members (engaging members, guide members) 21...Rotating part of the hook member (rotating part of the engaging member) 22... Hook (engaging part) 22'... Hook 23...Cylindrical part 24… Fastening screws 26…O-ring (resistor) 30... Slider (sliding member) 31...Tip of the slider (tip of the sliding member) 31f…Flat surface 32...Slider rod section 32a...Flange section 32b... Female thread 32c...Sleeve part 33...Side cover part of the slider 34... Rotatable part of the slider (rotatable part of the sliding member) 35...Protruding legs (holding parts) of the slider 36... Tapered portion (pointed portion) of the slider's protruding leg 36a... The tip of the tapered section (the tip of the pointed part) 36b... Lower surface of the tapered section 36t... Top surface of the 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 / display 122... Trigger switch 132... Strap 134... Belt hook 300... Hammer 400... Pressing tool C1...Threshold current during reverse drive in nail-pulling mode C2...Threshold current during reverse drive in clamp mode DA... Drive shaft L1…Length corresponding to the internal space required for the stroke of the hook member Loss... Hook offset amount L2…Height of the mechanism in the initial position (retracted state) L3…Length from drive shaft DA to the front end of the flat surface L4…The horizontal length from the drive shaft DA to the tip of the hook. L5...The horizontal length from the tip of the hook to the tip of the protruding leg. P... Nail (work target) Pc...The virtual central axis when nail P is assumed to be straight. Ph…nail head Pt…nail foot Q: Concrete panels (work target) R... Wooden battens (work target) U... (Users) VP... Virtual plane including the drive axis W0…Target initial position W1... Reverse side limit position W2...Forward rotation limit position W op ...Origin position X0... Initial positioning specified amount X1…Specified amount X2…Specified amount X ap …Specified amount for abnormality prevention

Claims

1. An electric tool capable of removing nails from components into which nails have been driven, The main body and An engaging member provided on the main body side and having an engaging portion that engages with a part of the work object, A sliding member that slides along a guide member provided on the main body and moves in and out of the main body, causing a part of it to move closer to and further away from the engaging member, A drive source for operating the sliding member, Equipped with, The engaging member has a cylindrical portion that guides the sliding member, The sliding member moves in a linear motion when the driving force of the drive source is transmitted via a drive mechanism including a ball screw, and the sliding member that contacts the member into which the nail is driven protrudes in the direction opposite to the direction in which the nail is pulled out, thereby causing the engaging member provided on the main body to move relative to it in the direction in which the nail is pulled out.

2. The power tool according to claim 1, wherein the engaging member is held by the main frame of the main body.

3. The power tool according to claim 1, wherein the drive source is a motor, and the sliding member is moved in a linear motion by a ball screw connected to the motor.

4. The power tool according to claim 1 or 3, wherein the drive source and the drive mechanism for transmitting the driving force of the drive source to the sliding member are arranged coaxially with a drive shaft that passes through the sliding member and extends along the sliding direction of the sliding member.

5. The power tool according to claim 4, wherein the drive source and the drive mechanism are arranged on the extension line of the drive shaft of the sliding member.

6. The power tool according to claim 5, wherein the grip portion held by the user of the power tool is located in a portion other than the extension line of the drive shaft.

7. The power tool according to claim 6, wherein the grip portion is formed to extend in a direction perpendicular to the drive shaft.

8. The power tool according to any one of claims 1 to 7, wherein the engaging member is slidable and is linked in the opposite direction to the sliding member by an interlocking mechanism.

9. The power tool according to any one of claims 1 to 8, further comprising a rechargeable battery.

10. The power tool according to claim 9, used as a rechargeable nail puller.

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