power tools

Abstract

To provide an electric tool which is configured to be more suitable for actual work such as nail pulling at the site.SOLUTION: An electric tool is used in work such as nail pulling. The electric tool 1 includes a body part 10, an engagement member 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, and a drive source operating the slide member 30. A pointed part 36 having a tapered shape is formed in at least a part of the slide member 30.SELECTED DRAWING: Figure 27A

Description

[Technical Field]

[0001] The present invention relates to a power tool. [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 mechanized power-operated nail pullers, such as air-operated, hydraulic-operated, and electric-operated, are sometimes used in such situations. Conventional nail pullers used in such situations generally have a threaded hook that catches the nail, and are generally designed 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] 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, in reality, when using a nail puller to remove nails, it is not always possible to hook the nail head and pull it out smoothly, and it is often necessary to use force, such as driving a crowbar next to the embedded nail and slightly dragging it out, or inserting the tip of the crowbar between the nailed board (such as a concrete panel) and the frame (such as a batten) and then hitting it hard with a hammer to separate them. Considering these circumstances, it would be convenient if the nail puller was designed with these situations in mind.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a power tool having a structure more suitable for actual work such as nail pulling on site. [Means for solving the problem]

[0006] One aspect of the present invention is a power tool used for work such as nail removal, a main body; an engaging member provided on the main body portion side and having an engaging portion that engages with a part of a work object; 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; It is equipped with This is a power tool in which a tapered pointed portion is formed on a part of the sliding member.

[0007] With the power tool of the above-described embodiment, the tapered pointed portion formed on a part of the sliding member can be used to insert the sliding member, for example, into the gap between a board and a frame, or between a nail head that is barely floating and the board. By operating the sliding member in this inserted state, it becomes possible to separate the board and the frame, or to remove a nail that is difficult to remove, which leads to easier and more efficient work.

[0008] In the power tool as described above, the pointed portion may have a tapered shape facing away from the drive shaft that passes through the sliding member and extends in the sliding direction of the sliding member.

[0009] In the power tool as described above, the pointed portion may have a tapered shape that faces in a direction perpendicular to the drive shaft.

[0010] In the power tool as described above, the pointed portion may be formed in a shape such that its tip is positioned outside the engaging portion of the engaging member relative to the drive shaft.

[0011] In the power tool as described above, the pointed portion may be formed larger than the engaging member.

[0012] In the power tool as described above, the pointed portion may have a shape in which its outline is laid out outside the outline of the engaging member.

[0013] In the power tool as described above, a plurality of pointed portions may be formed, and the pointed portions may be spaced apart so that the engaging portion can be accommodated therein.

[0014] In the power tool as described above, the plurality of pointed portions may be formed symmetrically about a plane including the drive shaft.

[0015] In the power tool as described above, the pointed portion may be formed on a detachable attachment that forms part of the slider.

[0016] In the above-described power tool, the attachment may have a striking portion formed on the side opposite to the pointed portion.

[0017] In the power tool as described above, the striking portion may be formed in a shape that protrudes toward the side opposite to the pointed portion.

[0018] In the above-described power tool, the attachment may be made of metal.

[0019] In the above-described power tool, the attachment may be rotatable about the drive shaft. [Effects of the Invention]

[0020] According to the power tool of the present invention, it is possible to provide a structure that is more suitable for actual work such as pulling out nails on site. [Brief explanation of the drawings]

[0021] [Figure 1]FIG. 1 is a perspective view showing a state in which a rechargeable nail puller, which is an example of a power tool, is placed. [Figure 2] FIG. 1 is a view (front view) of the cordless nail puller seen from one direction in an attitude (in use) in which the hook member faces directly downward. [Figure 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. [Figure 5] FIG. 4 is a view of the rechargeable nail puller shown in FIG. 3 as seen from below. [Figure 6A] FIG. 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 cordless nail puller in the same cross section as FIG. 6A with the slider slid. [Figure 7A] FIG. 1 is an oblique view of a cordless nail puller with the tip of the slider against a concrete panel. [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 cordless 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 surroundings in FIG. 8A. FIG. [Figure 9A] FIG. 2 is a diagram showing the internal configuration of the mechanism, such as the hook member and slider, as viewed from the front. [Figure 9B] 9B is a cross-sectional view of the hook member, slider, ball screw, etc. taken along line IXB-IXB in FIG. 9A. [Figure 10A] FIG. 10 is a side view of the hook member, slider, ball screw, etc., with the slide member slid partway with the hook hooked on the nail. [Figure 10B] FIG. 10B is a vertical cross-sectional view of the hook member, slider, ball screw, etc. shown in FIG. 10A. [Figure 11] 10 is a perspective view of the hook member, slider, ball screw, etc., seen from below in a state where 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] FIG. 13 is a perspective view showing a part of the hook member, slider, ball screw, etc. shown in FIG. 12. [Figure 14A] FIG. 14 is a perspective view showing a hook member and a main frame among the members shown in FIG. 13. [Figure 14B] FIG. 14 is a perspective view showing a slider and a ball screw among the members shown in FIG. 13. [Figure 15] 1A and 1B are diagrams illustrating a comparison between a rechargeable nail puller according to an embodiment of the present invention and a conventional rechargeable nail puller, in order to explain miniaturization, which is one of the advantages of the present invention. [Figure 16] FIG. 10 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] FIG. 10 is a front view of the hook member, slider, etc. of a conventional nail puller with the hook hooked on a nail driven at an angle. [Figure 17B] 17B is a cross-sectional view of a hook member, a slider, etc., taken along line XVIIB-XVIIB in FIG. 17A of the conventional nail puller. [Figure 17C] FIG. 10 is a perspective view showing a hook member, a slider, etc., in a state where the hook is hooked on a nail that has been driven obliquely into the nail puller of the related art. [Figure 18A] 1 is a front view of the hook member, slider, etc. of a conventional nail puller in a state where the slider has been slid to remove a nail that has been driven obliquely. [Figure 18B] 18B is a cross-sectional view of a hook member, a slider, etc., taken along line XVIIIB-XVIIIB in FIG. 18A of the conventional nail puller. [Figure 19A] FIG. 10 is a longitudinal cross-sectional view illustrating a hook member in which a hook portion is disposed at a position offset from a drive shaft. [Figure 19B] FIG. 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 the drive shaft. [Figure 20A] FIG. 1 is a perspective view showing the cordless nail puller without the cover, with the tip of the slider against a concrete panel. [Figure 20B] FIG. 20B is a perspective view of the cordless nail puller with the slider slid to the position shown in FIG. 20A. [Figure 21A] This is a perspective view showing the cordless nail puller with the hook turned around and the tip of the slider facing the concrete panel. [Figure 21B] FIG. 21B is a perspective view of the cordless nail puller with the slider 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, viewed from the tip 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. 10 is a right side view showing the cordless nail puller with the tip of the slider against a concrete panel. [Figure 23B] FIG. 23B is a vertical cross-sectional view of the rechargeable nail puller shown in FIG. 23A. [Figure 24A] FIG. 23B is a right side view showing the battery-operated nail puller with the slider slid to the position shown in FIG. 23A. [Figure 24B] FIG. 24B is a vertical cross-sectional view of the rechargeable nail puller shown in FIG. 24A. [Figure 24C] FIG. 2 is a longitudinal cross-sectional view of the cordless 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 part of the rechargeable nail puller with the pointed part inserted between a concrete panel (board material) and a crosspiece (frame material). [Figure 25C] This is an enlarged vertical cross-sectional view showing the attachment part of the rechargeable nail puller with the pointed part inserted between a concrete panel (plate material) and a crosspiece (frame material). [Figure 26]This is a perspective view 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 27A] This figure shows the state in which the pointed portion is inserted between the concrete panel (plate material) and the 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] FIG. 27B is a diagram (side view) showing the state shown in FIG. 27A from yet another angle. [Figure 28A] This is a side view showing how the nail foot of a nail that is still 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 nail foot, which is still stuck in the concrete panel (board material), 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] The 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 from 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. 10 is a perspective view showing, for reference, the relevant portion of a conventional battery-operated nail puller in which a hook is disposed at a position directly below a ball screw. [Figure 30B] FIG. 10 is a side view showing, for reference, a portion of a conventional battery-powered nail puller in which a hook is disposed directly below a ball screw. [Figure 31] FIG. 2 is a block diagram showing an example of the configuration of a control device, an origin sensor, etc. [Figure 32A] FIG. 10 is a flowchart showing an operation flow of initial position detection (in the case of sensorless). [Figure 32B] FIG. 10 is a diagram illustrating an outline of the operation (pattern 1) of initial position detection (sensorless case). [Figure 32C] FIG. 10 is a diagram illustrating an outline of the operation (pattern 2) of initial position detection (sensorless case). [Figure 32D] FIG. 10 is a diagram illustrating an outline of the operation (pattern 3) of initial position detection (sensorless case). [Figure 33A] FIG. 10 is a flowchart showing an operation flow of initial position detection (when a sensor is used). [Figure 33B] FIG. 10 is a diagram showing an outline of the operation (pattern 1) of initial position detection (when a sensor is present). [Figure 33C] FIG. 10 is a diagram showing an outline of the operation (pattern 2) of initial position detection (when a sensor is present). [Figure 33D] FIG. 10 is a diagram showing an outline of the operation (pattern 3) of initial position detection (when a sensor is present). [Figure 34] FIG. 10 is a flowchart of a portion of the nail puller operation flow corresponding to a "nail puller mode." [Figure 35] FIG. 10 is a flow chart of the nail puller operation flow corresponding to the "nail puller one cycle mode." [Figure 36A] FIG. 10 is a flow chart of the nail puller+clamp operation flow corresponding to the "nail puller mode." [Figure 36B] FIG. 10 is a flow chart of the nail puller + clamp operation flow corresponding to the "nail puller 1 cycle mode." [Figure 36C] FIG. 10 is a flow chart of the nail puller + clamp operation flow corresponding to the "clamp mode." [Figure 37] 10 is a graph showing an example of a current waveform during reverse driving in a clamp mode. [Figure 38A]FIG. 10 is a flowchart of the portion of the operation flow of nail puller+initial position detection+clamp corresponding to the "nail puller mode." [Figure 38B] FIG. 10 is a flowchart of the portion of the operation flow of nail puller + initial position detection + clamping that corresponds to the "nail puller 1 cycle mode." [Figure 38C] FIG. 10 is a flowchart of the portion of the operation flow for nail removal, initial position detection, and clamping that corresponds to the "clamp mode." DETAILED DESCRIPTION OF THE INVENTION

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

[0023] [First embodiment] As a first embodiment of the present invention, a description will be given of a power tool used as a rechargeable nail puller (see FIG. 1, etc.). The rechargeable nail puller 1 is a type of rechargeable power tool used for nail removal work, such as removing a nail P that has penetrated a board or frame material such as a concrete panel Q or a batten 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.). The hook member 20 fixed to the main body 10 is hooked onto a nail head Ph, and in this state, the slider 30 is caused to protrude from the main body 10 along the drive shaft DA, causing the slider 30 to perform a nail removal operation (see FIG. 19B, etc.). Below, the configuration of the rechargeable nail puller 1 will first be described, 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 drive part (slider 30, etc.). In this embodiment, the main body 10 mainly comprises 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., which will be 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 portion 12 is shaped to connect the relatively heavy and bulky battery housing portion 13 and the mechanical portion 11, except for the area extending from the drive shaft DA. The entire structure is designed to provide good weight balance and ease of handling when a user grasps the grip portion 12 to lift and operate the cordless nail puller 1 (see FIGS. 4, 5, etc.). In this embodiment, the grip portion 12 is formed to extend perpendicular to the drive shaft DA, but it may also be formed to extend slightly obliquely to facilitate nail pulling and other operations. A trigger switch 122 operable with a finger is provided on the portion of the grip portion 12 closer to the mechanical portion 11 (see FIG. 3, etc.). While not described in detail here, the grip portion 12 is shaped and sized to be easy to grip, and its surface is treated to be non-slip and easy to grip, such as by arranging a flexible member.

[0027] The battery housing 13 houses a rechargeable battery 66 and other components, and is one of the parts of the main body 10 that tends to be heavy. In this embodiment, the battery housing 13 is configured as a roughly rectangular parallelepiped housing, with a shape and size suitable for housing a large battery 66 (see FIG. 6A, etc.). The rechargeable nail puller 1 of this embodiment, which incorporates the rechargeable battery 66, can be used as a cordless hand tool to perform nail pulling operations without a cord. The surface of the battery housing 13 opposite the grip portion 12 is flat, and a rubber pad (not shown) or the like may be attached as needed. This surface serves as a mounting surface 13S when the battery housing 13 is placed stably on the ground or floor (mounted state) when not in use (see FIGS. 1, 3, etc.). The battery housing 13 of this embodiment is further provided with a strap 132 and a belt hook 134 (see FIG. 2, etc.).

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

[0029] The hook member 20 functions as a member that engages with a part of the work object (in this embodiment, the head (nail head Ph) of the nail P to be pulled out from a batten or the like), 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 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 narrows toward the front when viewed from the side (the left-right direction perpendicular to the front-to-back direction when in use), it will be easier to hook 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 (described later) of the slider 30 that slides up and down (see Figure 13, etc.).

[0030] The main frame 14 is a frame formed in the mechanical unit 11 of the main body 10 so as to extend in the vertical direction (from top to bottom) along the drive axis DA (see FIG. 12, etc.). In this embodiment, the main frame 14 is a pair of left and right plate-like members arranged symmetrically on either side of the drive axis DA (see FIGS. 9A and 9B, etc.). The upper end of the main frame 14 is attached and fixed to a frame base 15 (see FIG. 13, etc.). A hook member 20 is fastened to the distal end (lower portion) of the main frame 14 by fastening screws 24 on both sides (see FIG. 14A, etc.). When fixed to the main frame 14, the hook member 20 does not change its relative position in the vertical direction (the direction along the drive axis DA) within the mechanical unit 11. In addition to holding the hook member 20 thus fixed, the main frame 14 also serves as a guide member that guides the slider 30, which slides in the vertical direction.

[0031] The slider (sliding member) 30 is a movable member that slides up and down to appear and disappear with respect to the main body 10, moving a portion of it (tip 31) toward and away from the hook 22 of the hook member 20, functioning like a leg (a 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, and the tip 31 of the slider 30 are moved relatively away from each other, and this movement allows the nail P to be pulled out (see FIGS. 7B, 8B, etc.). The slider 30 of the cordless nail puller 1 of this embodiment configured in this manner can be said to function like a tension rod when pushing the main body 10 together with the hook 22 up against a nailed concrete panel Q, a batten R, or the like (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 integrated together, and slides up and down 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 drive mechanism 70 including a screw shaft 72, and the slider 30 moves linearly along the drive 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, and serves as a tensioning portion that abuts against a concrete panel Q, a crosspiece R, etc., and pushes up the main body portion 10 relatively (see Figures 7A, 8A, etc.).

[0034] The rod portion 32 is a rod-shaped member extending along the drive axis DA, and its lower tip is integrated with the tip portion 31 (see FIG. 14B, etc.). The rod portion 32 is cylindrical so that the screw shaft 72 passes through its interior (see FIG. 6A, etc.). A sleeve portion 32c having an internal thread 32b that threadably engages with the screw shaft 72 is provided on the inner periphery of a part of the rod portion 32, such as the upper flange portion 32a. As the screw shaft 72 rotates, the rod portion 32 and, by extension, the entire slider 30 moves linearly along the drive axis DA (see FIG. 6B, etc.). The screw shaft 72, the internal thread 32b, and a steel ball (not shown) interposed between the screw shaft 72 and the internal thread 32b constitute a drive mechanism 70 for linearly moving the slider 30, such as a ball screw (denoted by reference numeral 73 in FIG. 9A, etc.) as in this embodiment. Rod portion 32 is formed so that its outer diameter is smaller than the inner diameter of hook member 20, is disposed inside hook member 20, and is guided by the inner peripheral surface of hook member 20 when sliding (linearly moving) (see Figures 10B, 13, etc.). Rod portion 32 is integrally fastened to side cover portion 33 at its lower end with screws (flat head cap bolts, etc.) 39 (see Figures 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 this side cover portion 33 are formed so that their cross-sectional shapes are channel-shaped, and the main frame 14 is sandwiched between the groove portions (see FIGS. 9A, 9B, etc.). The side cover portion 33 formed in this manner 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 hide the portion of the slider 30 except for the tip portion 31 when the slider 30 is in a retracted state (initial position) where the slider 30 is 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, etc.). 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 of this embodiment is connected to the motor 60 so as to be able to communicate bidirectionally with it and to send and receive control signals, and is also connected to the origin sensor 80, trigger switch 122, mode operation / display section 92, and battery storage section 13 (battery 66 stored therein) (see FIG. 31). The control device 90 also includes a communication circuit, converter circuit, inverter circuit, and an MPU for controlling the communication circuit for communicating with these components, although these are not shown.

[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 battery 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 in series and coaxially. This configuration, combined with the configuration that enables the overall height of the battery nail puller 1 to be reduced, contributes to improved handling and ease of aiming.

[0041] That is, first, in a rechargeable nail puller 1 such as this embodiment, in which the hook member 20 is fixed rather than 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 this configuration, the overall height (the length of the mechanism unit 11 along the drive axis 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 its initial position) can be reduced by the length L1 (substantially 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 been secured inside the main body 10, i.e., it is possible to reduce the overall height (see Figures 15 and 16, etc. In Figure 15(B), the reference symbol 1' is used to denote 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] Second, the reduction in overall height as described above makes it easier to arrange the motor 60 on the drive shaft DA (or an extension thereof). For example, while the motor 60 previously had to be offset within the handgrip 12 to avoid excessively high overall height, the present embodiment, which achieves a reduced overall height, allows it to be arranged on the drive shaft DA (or an extension thereof). In this case, the handgrip 12 can be configured closer to the mechanism 11 and the hook 22. The proximity of the handgrip 12 to the mechanism 11 and the hook 22 contributes to easier handling and aiming during actual nail removal work, particularly to more reliably performing tasks such as hooking the hook 22 onto the nail head Ph. Furthermore, the force acting on the screw shaft 72 acts directly below (coaxially with) the screw shaft 72, regardless of the position or orientation of the nail P. This eliminates the need to arrange the hook 22 directly below the drive shaft DA, and also contributes to solving the problem of "difficulty in aiming the nail."

[0043] Furthermore, arranging the motor 60, reducer 71, and screw shaft 72 close to each other in a straight line means that the conventional power transmission mechanism (such as a bevel gear) that was arranged between them can be omitted, resulting in a simpler structure and contributing to miniaturization and weight reduction. Furthermore, such a battery-powered nail puller 1 is conveniently easy to use in tight 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, but with the rechargeable nail puller 1 of this embodiment as described above, it is possible to pull out nails without scattering them.

[0045] Furthermore, when the main body 10 itself strokes and moves in conjunction with the nail pulling operation (i.e., moves together with the hook 22 to move away from the concrete panel Q, batten R, etc.) as in the rechargeable nail puller 1 of this embodiment (see FIGS. 7A to 8B, etc.), there is an advantage that it is easier for the user to experience the nail pulling operation. That is, with a conventional structure in which the hook slides within the main body, a user working while holding the rechargeable nail puller in their hand can only confirm the nail pulling operation by seeing it with their eyes or hearing the sound of it operating, 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 conjunction with the nail pulling operation, making it easier for them to realize that the nail pulling operation has been 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 battery-powered nail puller 1 will be described. Note that the description of other configurations of the battery-powered 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> When configuring the above-described battery-powered nail puller 1, it is preferable to consider the problem of "unbalanced 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 unbalanced load (unbalanced load) is applied (see Figures 17A and 17B). However, in reality, the nail P often penetrates at an angle (see Figure 17C), and when the nail P is pulled out, the nail pull-out resistance occurs at a position offset from the drive shaft, which causes a lateral load to act on the drive shaft as an unbalanced load (see Figures 18A and 18B). In other words, resistance during nail removal occurs at the frictional resistance portion between the nail P and the concrete panel Q or batten R (the nail-driven component), more specifically, at the portion of the nail P that penetrates the batten R (the portion marked with small dots in FIG. 18B ). Therefore, the reason why an unbalanced load acts on the nail P driven 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. The unbalanced load causes the screw shaft 72′ to tilt, and as the amount of nail P pulled increases, the tilt also increases. As a result, the load acting on the bearing portion of the screw shaft 72′ can cause uneven wear and reduce durability. Since an unbalanced load occurs due to misalignment between the drive shaft and the nail, this is even more likely if the hook 22 is positioned offset from the drive shaft DA, as in this embodiment. Considering the problem of uneven loads, one possible configuration to minimize or eliminate their effects is to position the hook that catches the nail head on the drive shaft in conventional mechanisms to prevent uneven loads from occurring. However, while this type of positioning in conventional mechanisms is effective in improving durability, it has the disadvantage of making it difficult to see (aim) the tip of the nail. In addition, it cannot avoid the uneven load that occurs when extracting a nail that has penetrated at an angle. In this regard, the present embodiment, which comprehensively considers various issues, employs a rigid structure that makes it easy to see (aim) the tip of the nail and is less susceptible to the effects of unbalanced loads. That is, the hook, which is subjected to an unbalanced load in the diagonal and lateral directions, is supported not by a screw shaft for generating a driving force but by the highly rigid main frame 14. Also, a guide member is provided to guide the sliding of the slider 30, which is the movable part, to prevent unbalanced loads 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 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 to protrude in a direction perpendicular to the drive shaft DA and faces horizontally when in use (see FIG. 6A, etc.). At least a portion of the hook 22 is provided outside the cover 50 so that it can be seen (see FIG. 5, etc.). The advantages of the above configuration are as follows: In some conventional battery-operated nail pullers, the hook 22' is disposed 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 FIGS. 30A and 30B). However, this makes it difficult to see the hook 22' and determine its position, which can make it difficult to engage the hook 22' on the nail head Ph. In this regard, according to the battery 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, making it easier for the user to hook the hook 22 onto the nail head Ph (see Figures 7A, 7B, etc.).

[0049] <Protruding leg at the tip of the slider> In addition, in this embodiment, in accordance with the offset arrangement of the hook 22 as described above, the slider 30, particularly the tip end 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 protruding legs 35 that protrude in a direction perpendicular to the drive axis DA (see FIG. 10A, etc.). The protruding legs 35 are formed with a size and shape sufficient to eliminate the influence of external forces (moments) that may act when the offset hook 22 pulls out the nail P. As a preferred example, in this embodiment, a pair of protruding legs 35 that are sufficiently large compared to the hook 22 (see FIG. 19A, etc.) and symmetrically arranged on the left and right are provided on the tip 31 (see FIG. 5, etc.). The length from the drive axis DA to the tip of the hook 22 is L4, and the protruding legs 35 are 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 of the hook member 20 so that the hook 22 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, or the like (see FIG. 19A, etc.). This flat surface 31f is sized or shaped to at least eliminate the effect of external forces (moments) that may act when the offset hook 22 pulls out the nail P. In this embodiment, the flat surface 31f extends 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 hooked 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 contact area) with the concrete panel Q, the crosspiece R, or the like (see FIG. 19B, etc.). It goes without saying that the entire underside of the protruding leg 35 described above or most of its portion may be flat.

[0050] <Rotating structures such as hooks> When 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) about the drive shaft DA. This reduces operational constraints that would otherwise be imposed on the cordless nail puller 1, such as the need to always use the cordless nail puller 1 in a fixed orientation, and makes it easier to handle (see FIGS. 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 the rotatable portion 21 to be changed (see FIGS. 21A, 21B, 22A, etc.). The specific configuration of the rotatable portion 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] O-ring 26 is an annular member made of, for example, rubber, provided between rotatable portion 21 and cylindrical portion 23 (see FIG. 23B, etc.). O-ring 26 functions as a resistor that applies a predetermined resistance to the rotational movement of rotatable portion 21 about drive axis DA, and while allowing relative rotation of rotatable portion 21, prevents rotatable portion 21 from unexpectedly rotating after the orientation of hook 22 is changed.

[0052] The battery-powered nail puller 1 of this embodiment is configured so that the orientation of not only the hook 22 but also 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 that enables relative rotation and an O-ring 38 are provided between them, so that the tip portion 31, the side cover portion 33, and the protruding leg portion 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] O-ring 38 is an annular member made of, for example, rubber, provided between rod portion 32 and tip portion 31 (see FIG. 24B, etc.). This O-ring 38 functions as a resistor that applies a predetermined resistance to the rotational movement of tip portion 31 and the like about drive axis DA, and while allowing relative rotation of tip portion 31 and the like, it prevents protruding leg portion 35 and tip portion 31 from unexpectedly rotating after the orientation of 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 its 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 rotation. Therefore, in the battery-powered nail puller 1 of this embodiment, rotating the protruding leg 35 in the retracted state (initial position) will also rotate the hook 22 by the same amount. For example, if the orientation of the hook 22 needs to be changed depending on the position or shape of the nail P, simply rotating the outer protruding leg 35 will change the orientation of the hook 22 at the same time, which is convenient (see FIGS. 22A, 22B, etc.). Furthermore, the fact that the protruding leg 35 and the hook 22 always face in the same direction means that the protruding leg 35 is always located directly below the hook 22 when the nail P is being pulled out (see FIGS. 24A, 24B, etc.). Therefore, no matter which direction the hook 22 is oriented, the external force (moment) that may act when the offset-positioned hook 22 pulls out the nail P is received by the protruding leg 35 directly below, and the influence thereof 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 guides the slider 30 and the rotatable portion 21 of the hook member 20 and rotates them a predetermined amount so that the hook 22 and the protruding leg 35 face forward while guiding the slider 30 and the rotatable portion 21 of the hook member 20 during the period from a state in which the slider 30 protrudes most from the main body 10 to remove the nail P (protruding state) (see FIGS. 24B, 24C, etc.) to the initial position in which the slider 30 is retracted (see FIG. 23B, etc.) (for example, a device comprising a combination of a spiral guide and a protrusion 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 as the slider 30 slides up and returns to its initial position).

[0056] <Structure for clamping components> The main purpose of the cordless nail puller 1 equipped with the hook 22 and protruding leg 35 described above is, of course, to pull nails, but it can also be used as a clamping device for clamping members arranged perpendicular to the drive shaft DA. For example, when clamping the crosspieces of two concrete panels Q together to bring the panels Q into contact with each other without any gaps, the crosspieces R can be sandwiched between the underside of the hook 22 and the upper surface of the protruding leg 35 (see Figures 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 sandwiches the member to be clamped and holds it in place.

[0057] The cordless nail puller 1 of this embodiment is a single power tool that can be used for practical purposes other than nail pulling. This also 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.

[0058] [Third embodiment] As a third embodiment of the present invention, we will explain a rechargeable nail puller 1 that further improves convenience by enabling it to be used for demolition work such as concrete panels Q and battens R. 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, work such as separating plate materials or frame materials such as concrete panels Q and battens R can be easily performed (see Figure 25A, etc.).

[0059] <Structure suitable for demolition work of boards, etc.> In this embodiment, a tapered portion 36 is formed on a portion of the protruding leg portion 35 of the slider 30 (see FIG. 25A, etc.). The tapered portion 36 is a wedge-shaped tapered portion facing away from the drive shaft DA. For example, in this embodiment, the tapered portion 36 is formed on a portion facing forward when the cordless nail puller 1 is in the initial retracted position, facing 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. As in this embodiment, both the upper surface 36t and the lower surface 36b may be inclined (see FIG. 25C, etc.), or only one of them may be inclined and the other may be horizontal in use. Furthermore, the upper surface 36t and the lower surface 36b may be flat or gently curved. The point is that when the slider 30 is struck to drive the tapered portion 36, it should have a wedge shape that exerts a force to separate the plate material or frame material such as the concrete panel Q or the crosspiece R.

[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 (denoted by 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 fit between them (see FIG. 7B, etc.).

[0061] A struck portion 37 is formed on the slider 30 on the side opposite the tapered portion 36 when the drive axis DA is used as the reference (the rear side when in use) (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 the 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 cordless 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 beyond the surface of the cover 50 (see FIG. 25C, etc.).

[0062] At least the portion of the slider 30 that is used for the striking operation (the portion including the tapered portion 36 and the struck portion 37) is made of a material that is rigid enough to withstand the impact. This portion may be made of metal, such as a cast metal. Alternatively, this portion may be made of a detachable attachment (indicated by the reference numeral 40 in FIG. 25B). If a detachable attachment 40 including the tapered portion 36 and the struck portion 37 is used, the tapered portion 36 or 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 cast metal. The attachment 40 may be provided to the rod portion 32 of the slider 30 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, 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, a shape in which the hook 22 is hidden within the projection of the protruding leg portion 35 or its tapered portion 36 when viewed from the side) (see FIG. 25C, etc.). By forming the tapered portion 36 larger than the hook 22 and positioning it forward in this way, it is possible to avoid the hook 22 from acting as a resistance when inserting the tapered portion 36 into a gap between a concrete panel Q and a crosspiece R, for example.

[0064] With the rechargeable nail puller 1 described above, the tapered portion 36 is inserted into the gap between, for example, a concrete panel Q and a batten R, and the striking portion 37 is struck with the hammer 300. This striking force widens the gap between the concrete panel Q and the batten R, just as if using a crowbar (see FIG. 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 them easier to separate (see FIGS. 27A, 27B, 27C, etc.). Furthermore, if the nail head Ph is slightly lifted from the concrete panel Q or the batten R but firmly penetrates the panel, 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 advance the hook member 20 and fully engage the hook 22 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 nails P that have been stuck into boards or frame materials such as concrete panels Q and crosspieces R (see Figure 28A, etc.).

[0066] Nails P driven into formwork panels are often driven with the nail heads Ph raised, considering the dismantling that will be performed after the concrete has hardened. However, there may be cases where the raised width is insufficient and it is difficult to hook the hooks 22. In such cases, it is convenient to raise the nail P even further. In such cases, the rechargeable nail puller 1 can be used to raise the nail P even further. Specifically, for example, if a nail P remains stuck in a concrete panel Q that has been separated from a batten (see FIG. 28E(a)), first, a press-down tool 400 is installed between the pair of left and right hooks 22. With the slider 30 slid in the protruding state, the protruding leg 35 is placed against the surface of the concrete panel Q (the surface where the nail heads Ph are located), and the press-down tool 400 is used to press down the nail foot Pt (see FIGS. 28A, 28B, 28C, 28D, and 28E(b)). When the nail head Ph has lifted off the surface of the concrete panel Q (see FIG. 28E(c)), the nail P can be extracted with the rechargeable nail puller 1 (see FIG. 28E(d)), which may enable smooth and efficient work. The push-down tool 400 may be any tool 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 cordless nail puller 1 of this embodiment is a single power tool that can be used for practical purposes other than nail pulling. This also 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 control 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 its 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 determines 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 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 operating modes for operating the slider 30 depending on the type of work to be performed on the work object. The operating modes are various operating methods that are set so that the user can select one depending on how the rechargeable nail puller 1 moves when pulling out nails, or on the state or desired operation when used for purposes other than pulling nails. The rechargeable nail puller 1 of this embodiment has a "nail pull mode," a "nail pull one-cycle mode," and a "clamp mode" that the user can select by operating a mode operation / display unit (indicated by reference numeral 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 the operation mode for nail pulling, a "nail pull mode" and a "nail pull 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 operates when pulling nails according to the type of nail pulling to be performed or the desired operation.

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

[0075] After the initial position driving 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 configured so that it can be switched by operating, for example, 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 tactile switch or a dial switch. Although a detailed explanation is omitted, the switch may be selectable from an "auto" setting that automatically sets the movement amount and a "standard" setting 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 starts (step SP314).

[0077] In the nail removal operation step, the motor 60 is driven in the forward direction to move the slider 30 in the direction of protruding from the main body 10 (i.e., the nail removal operation direction described above) (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 drive of the slider 30 (step SP316). After the drive 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 goes from being pulled by the user's finger (trigger ON state) to being released (or the force pulling the switch is relaxed) and the trigger switch 122 returns to its original state (trigger OFF state). When the trigger signal turns off (i.e., the system goes to the trigger OFF state), the motor 60 is rotated in the reverse direction to move the slider 30 back to its initial position (to be pulled into the main body 10) (step SP318). When the slider 30 returns and reaches its initial position (step SP319), the drive of the motor 60 and slider 30 is stopped (step SP320), and the series of operations (nail pull mode) is terminated. After the series of operations is completed, the process returns to step SP303 to prepare for the next nail pull operation and performs the same operations as described above in response to inputs (see FIG. 34). As described above, in the nail pull mode, the slider 30 is caused to perform a predetermined operation in response to an externally input trigger signal, 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 pull one-cycle mode" is selected in step SP303 will be described (see FIG. 35, etc.). In the "nail pull one-cycle mode," the initial position drive operation is performed (step SP321), and then the following operations are performed in sequence (see FIG. 35): setting the movement amount (step SP322), waiting for the trigger to turn ON (step SP323), performing the nail pull operation (step SP324), reaching the set movement amount (step SP325), and stopping the drive (step SP326). The operations up to this point are the same as those in steps SP311 to SP316 in the "nail pull mode" described above (see FIGS. 34 and 35).

[0079] Thereafter, in the nail pull 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 back to its initial position (step SP327), and the slider 30 is not maintained in the extended state. When the slider 30 returns and reaches its initial position (step SP328), the drive of the motor 60 and slider 30 is stopped (step SP329). After the drive is stopped, the system waits until the trigger is turned OFF (step SP330). When the trigger switch 122 returns from the state in which it is being pulled by the user's finger (trigger ON state) to the original state (trigger OFF state), the system returns to step SP303 and prepares for the next nail pull operation (see Figures 34 and 35). As described above, in the nail pull one-cycle mode, when the trigger signal is turned ON, the slider 30 is slid a predetermined distance and then returned to its initial position.

[0080] <Nail puller + clamp operation flow> The rechargeable nail puller 1 may be configured to perform clamping in addition to nail pulling. An example of an operation flow in this case where both the nail pulling and clamping operations 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). When "nail pull mode" is selected, the operation flow (steps SP511 to SP520, see FIG. 36A) is the same as that for the above-mentioned "nail pull mode" (see FIG. 34), and when "nail pull one-cycle mode" is selected, the operation flow (steps SP521 to SP530, see FIG. 36B) is the same as that for 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 is 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 system 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 the clamping operation (the operation of clamping the workpiece, such as the 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 after the clamping operation is started before the slider 30 reaches the initial position (NO in step SP534, YES in step SP535), the driving of the motor 60 and the slider 30 is stopped at that point (step SP536), and the system waits until the trigger is turned OFF (step SP537) while maintaining the workpiece clamped. That is, the system waits until the trigger switch 122 is released from its state of being pulled by the user's finger (trigger ON state) (or the force pulling the switch is relaxed) and the trigger switch 122 returns to its original state (trigger OFF state). Once the trigger switch 122 is in the trigger OFF state, the system 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 back to the maximum extension position (step SP540). Once the slider 30 reaches the maximum extension position (step SP541), the drive of the motor 60 and the slider 30 is stopped (step SP542). The system then waits until the trigger switch 122 is in the trigger OFF state (step SP543). Once the trigger switch 122 is in the trigger OFF state, the system returns to the step of selecting the operation mode (step SP503).

[0083] Furthermore, if the slider 30 reaches the initial position in step SP534 (YES in step SP534), it is determined that the work object or the like 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 Figure 36C).

[0084] The load acting on the slider 30 and the motor 60 during 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 clamping 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 pulling mode (specifically, when the slider 30 is returned to its initial position (step SP518) after the nail pulling operation (see FIG. 36A)). Therefore, when a threshold current C1 during reverse driving in the nail pulling mode is set, by setting a value C2 greater than the current C1 as the threshold current during reverse driving in the clamping mode, it is possible to detect the completion of the clamping operation based on the threshold current C2 (see FIG. 37).

[0085] <Operation flow for initial position detection (sensorless)> Next, we will explain the operational flow for positioning the slider 30 and other components to their initial positions in response to a trigger signal from the rechargeable nail puller 1. Here, we will explain three patterns for a sensorless rechargeable nail puller 1, i.e., one that does not have a sensor to detect the position of the slider 30: pattern 1, in which there is no room for a pinched component; pattern 2, in which there is room for a pinched component and the operation ends normally; and pattern 3, in which a pinched component occurs and the operation ends abnormally (see FIGS. 32A to 32D). The flow illustrating the operations of the three patterns 1 to 3 is shown in FIG. 32A. In addition, in FIGS. 32B to 32D, a location on the slider 30 is designated as the "operating portion," and this portion is indicated by a hollow triangle 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 in FIGS. 32B to 32D as a movement to the right (the direction of the nail-pulling operation) as viewed in the figure. 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 indicated in parentheses with the same numbers.

[0086] <Operation flow for initial position detection (sensorless) (Pattern 1)> In the battery-powered 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 and the flow starts, the motor 60 is first driven in the reverse direction (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 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 the slider 30 has moved a predetermined amount equivalent to the specified amount X0 for setting the initial position (step SP142).

[0087] Here, the "specified initial position setting amount X0" refers to an amount equivalent to the difference between the "target initial position W0" where the slider 30 should be positioned at the beginning of the operation and the above-mentioned "reverse rotation limit position W1" (see FIG. 32B). In this embodiment, the slider 30 is first pulled back to the reverse rotation limit position W1, and then slid a predetermined length equivalent to the specified initial position setting amount X0 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 rotation limit position W1" by the "specified initial position setting amount X0" (YES in step SP142), it is determined that the slider 30 has reached the "target initial position W0," and the motor 60 is stopped (step SP143). This completes the series of initial position detection operations (step SP144), and the process transitions 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 which there is a possibility that some member may be caught during the movement of the slider 30 associated with the initial position detection (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 unit has moved a specified amount X1 (whether the movable unit has entered the main body unit 10) (step SP121). The specified amount X1 here is different from the specified amount X0 for initial positioning described above. The flow of returning to step SP111 is repeated until the amount of movement of the movable unit reaches this specified amount X1 (NO in step SP121). When the amount of movement of the movable unit 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 protruding from the main body unit 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 the process proceeds to step SP124 (see FIG. 32A).

[0090] In step SP124, the motor 60 is rotated in the reverse direction, moving the slider 30 in the direction of being pulled into the main body 10. Thereafter, it is determined whether 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 moved to the abnormality prevention specified amount X ap It is determined whether or not the movement has been made by the above amount (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 it has occurred while the slider 30 is moving (in this embodiment, moving from the forward rotation limit position W2 to the reverse rotation limit position W1), and is set as an amount that occupies a predetermined percentage of the possible stroke width of the slider 30 (see FIG. 32C). In step SP126, the slider 30 is moved to the abnormality prevention specified amount X 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 in pattern 1 described above are performed (steps SP141 to SP144, step SP150). On the other hand, if the slider 30 has moved more than the abnormality prevention specified amount X ap If it has not moved any further, proceed to step SP131 (see FIG. 32A). Step SP131 will be explained in Pattern 3 below.

[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 in the above-mentioned step SP126. ap In step SP126, the slider 30 is moved to the abnormality prevention specified amount X ap If the slider 30 has not moved beyond this limit, 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 getting caught while moving from the forward rotation limit position W2 to the reverse rotation limit position W1 (step SP131). In this case, the operation flow for detecting the initial position is terminated. The user may also be notified of the occurrence of the abnormal lock by turning on a lamp or sounding a buzzer provided on the main body 10 of the cordless nail puller 1.

[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 rechargeable nail puller 1 will be described. op " Pattern 1, which starts detection at "Origin position W op Pattern 2, which starts detection at "operating part position", "operating part position = origin position W op " and pattern 3, which starts detection at " (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 explained 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 located 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 in the origin position. Specific examples of what can be used as the detection sensor are not limited, but 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 and the flow starts, the state of the origin sensor is checked to determine whether the origin sensor has detected the moving part of the slider 30 or has not (step SP203). If the origin sensor has not detected the moving part, 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 in which it protrudes from the main body 10 (the direction of the nail-pulling operation) (see FIG. 33A). After that, the process waits to see if 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 detection, the process proceeds according to the operation flow of pattern 2, which will be described later.

[0096] When the origin sensor detects the moving part (step SP212), the process waits until the origin sensor no longer detects the moving part (step SP213). When the slider 30 is moved and the sensor no longer detects the moving part, the moving part returns to the origin position W. op At this point, the motor 60 is reversed (step SP214) to move the slider 30 in the direction of returning it to the original position W. After that, when the origin sensor detects the moving part (step SP215), op The moving part that has passed through returns to the origin position W op In this embodiment, the motor 60 is stopped once (step SP241), and in this state, a series of initial position detection operations are completed (step SP242), and then normal control (control associated with operations such as nail removal) is performed (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 (first trigger), the moving part position is less than the origin position W. op ”(Origin position W op is located in the direction of the nail pulling out operation from the moving part), but in the middle of the operation flow, at the time of the first trigger, it is actually the opposite "origin 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 pulling operation, the operation flow of pattern 2 described below is carried out (see FIGS. 33A and 33C).

[0098] That is, after the motor is driven 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 the specified amount X2 without detection (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, if the origin sensor detects the moving part (step SP223), the slider 30 is returned to 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 The controller 10 determines that the motor 60 is positioned at the initial position and stops the motor 60 (step SP241), then completes a series of initial position detection operations (step SP242), and then transitions 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 Figures 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 of protruding from the main body 10 (nail pulling operation direction), and the operation waits until the origin sensor goes into a non-detection state (step SP232). When 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 of pulling 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 The controller 10 determines that the motor 60 has returned to the initial position and stops the motor 60 (step SP241), and then completes a series of initial position detection operations in this state (step SP242), before transitioning to normal control (step SP250).

[0100] <Operation flow of nail removal + initial position detection + clamp> An initial position detection operation after the trigger is turned on may be added to the above-described nail puller and clamping operation. An example of the operation flow in this case will be described below (see Figs. 38A to 38C). Note that the following description will focus on the differences from the above-described nail puller and clamping 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). For initial position detection, in the case of a sensorless system, a detection operation is performed as in the "Operation Flow for Initial Position Detection (Sensorless)" (see FIGS. 32A to 32D) described above, and in the case of a sensor, a detection operation is performed as in the "Operation Flow for Initial Position Detection (With Sensor)" (see FIGS. 33A to 33D) described above. Thereafter, a nail pulling operation or a clamping operation is performed (see FIGS. 38A to 38C) in the same manner as in the "Operation Flow for Nail Pulling + Clamping" (see FIGS. 36A to 36C) described above.

[0102] The above-described embodiment is one example of a preferred embodiment of the present invention, but is not limited to this and various modifications are possible within the scope of the present invention. For example, in the above-described 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 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 a linkage mechanism that links the slider 30 to the protruding movement of the hook member 20 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 specifically illustrated, various power-driven nail pullers, such as an electric nail puller using a motor as the drive source, compressed air nail pullers using an air motor, and hydraulic nail pullers using a hydraulic motor, as well as various power 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 use 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 suitable for application to various power tools, including electric nail pullers. [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... Rotatable portion of hook member (rotatable 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...Slider tip (sliding member tip) 31f…Flat surface 32...Slider rod 32a...Flange part 32b...Internal thread 32c...Sleeve section 33...Slider side cover 34... Rotatable part of slider (rotatable part of sliding member) 35...Slider protruding leg (holding 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...Press-down tool C1: Threshold current during reverse driving 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 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 center axis when nail P is assumed to be straight Ph…nail head Pt…nail foot Q...Concrete panel (work target) R...Slats (work object) U...(users) 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 work such as nail removal, a main body; an engaging member provided on the main body portion side and having an engaging portion that engages with a part of a work object; 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; It is equipped with a tapered pointed portion is formed on a part of the sliding member, the pointed portion facing in a direction perpendicular to a drive shaft that passes through the sliding member and extends along the sliding direction of the sliding member; The engaging member has an engaging portion formed thereon that protrudes from the drive shaft in the same direction as the pointed portion of the sliding member, The power tool, wherein the engaging member and the pointed portion are rotatable around the drive shaft.

2. The power tool according to claim 1 , wherein the pointed portion has a tapered shape facing away from the drive shaft.

3. The power tool according to claim 2 , wherein the pointed portion is formed in a shape such that a tip thereof is positioned outside the engaging portion of the engaging member with respect to the drive shaft.

4. The power tool according to claim 3 , wherein the pointed portion is larger than the engaging member.

5. The power tool according to claim 4 , wherein the pointed portion has an outline laid out outside the outline of the engaging member.

6. The power tool according to claim 4 or 5, wherein a plurality of the pointed portions are formed, and the pointed portions are spaced apart so that the engaging portion can be accommodated therein.

7. The power tool according to claim 6 , wherein the plurality of pointed portions are formed symmetrically about a plane including the drive shaft.

8. The power tool according to claim 1 , wherein the pointed portion is formed on a detachable attachment that constitutes a part of the sliding member.

9. The power tool according to claim 8 , wherein the attachment has a striking portion formed on a side opposite to the pointed portion.

10. The power tool according to claim 9, wherein the striking portion is formed in a shape that protrudes toward a side opposite the pointed portion.

11. The power tool according to any one of claims 8 to 10, wherein the attachment is made of metal.

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