Screw rotation tool

Abstract

To provide a screw rotation tool capable of preventing deformation of a tool hole formed in a head of a screw while reducing a workload in screw tightening work.SOLUTION: A screw rotation tool 1 is used for fastening a fastening object member OB by rotating a screw S having a tool hole S11 formed in a head S1. The screw rotation tool 1 comprises: a driver bit 2 having a protruding shape corresponding to the shape of the tool hole S11; a plier 3 having a pair of clamping jaw parts 31Aa, 31Ba, gripping handles 31Ab, 31Bb for swinging the pair of clamping jaw parts 31Aa, 31Ba to clamp the head S1 of the screw S and a welding fixing part 31Ad for supporting the driver bit 2 so as to extend in the same direction as an insertion direction A of the screw S; and a plier holder 4 for holding the plier and restricting idle rotation of the plier 3 relative to a rotational motion generated by a rotation driving device 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a screw turning tool, and more particularly to a screw turning tool equipped with an electric rotating device. [Background technology]

[0002] Screws have traditionally been used as fastening members. A screw has a head and a shank with a thread groove formed therein, and by rotating the head through a tool hole formed in the head, it is possible to generate a force (fastening force) to fasten two or more members together. Furthermore, screws can generate a high fastening force by the simple operation of rotating the head, and are generally easily available on the market, so they are widely used along with bolts.

[0003] Impact drivers are also becoming popular as tools that can assist in screw tightening work. By using an impact driver, the workload involved in screw tightening work can be reduced and the tightening force can be made uniform during screw tightening work. Patent Document 1 describes an impact driver equipped with an auxiliary device that prevents removed screws from falling. As disclosed in Patent Document 1, the impact driver incorporates various features to reduce the workload involved in screw tightening work and to improve the workability of screw tightening work. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Registered Utility Model No. 3241462 Summary of the Invention [Problem to be solved by the invention]

[0005] Although the impact driver described in Patent Document 1 can improve the workability of screw tightening work, there is still room for further improvement, as will be explained in detail below. When tightening a screw, a tool such as a screwdriver must be inserted into the tool hole in the head of the screw, and the screw must be rotated while being pressed into the workpiece so that the axial direction of the screwdriver's rotation shaft is the same as the screw's insertion direction (the direction in which the shank extends). In other words, if there is a large deviation between the axial direction of the screwdriver's rotation shaft and the screw's insertion direction, or if the force with which the screw is inserted into the workpiece is insufficient, the tip of the screwdriver will come out of the tool hole and spin freely, a cam-out phenomenon occurring. This cam-out phenomenon can deform the tool hole formed in the head of the screw, making it impossible to rotate the screw with the screwdriver.

[0006] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a screw turning tool that reduces the workload during screw tightening work and can prevent deformation of the tool hole formed in the head of the screw. [Means for solving the problem]

[0007] The above problem is solved by the screw turning tool of the present invention, which is a screw turning tool used for turning a screw having a tool hole formed in its head to fasten a workpiece, and which comprises: a driver bit having a protrusion corresponding to the tool hole; a clamping member having a set of clamping jaws; a clamping operation unit that swings the set of clamping jaws to clamp the head of the screw; a driver bit support unit that supports the driver bit so that it extends in the same direction as the direction in which the screw enters; a rotation drive unit that rotationally drives the driver bit and the clamping member; and a holding member that detachably holds the clamping member and prevents the clamping member from spinning freely when rotated by the rotation drive unit.

[0008] According to the above configuration, the screw turning tool has a rotary drive device, and the screw is rotated by a driver bit and a clamping member that are rotationally driven by the rotary drive device. This reduces the workload of the worker during screw tightening. The screw is rotated by the driver bit, which is supported so as to extend in the same direction as the screw's insertion, and the clamping member that clamps the screw head and is rotationally driven together with the driver bit. Therefore, the shank of the screw is pushed in so as to face the same direction as the screw's insertion, and a rotational force is applied to both the tool hole formed in the screw head and the outer periphery of the screw head. This effectively suppresses the cam-out phenomenon of the screw and prevents deformation of the tool hole formed in the screw head.

[0009] Furthermore, the clamping operation portion is a set of gripping handles that are formed integrally with each of the set of clamping jaws and can swing and operate the set of clamping jaws, and the holding member has an accommodating recess that can accommodate the set of gripping handles in the direction opposite to the entry direction of the screw, and the accommodating recess has an oval shape with a major axis and a minor axis, and the major axis has a length greater than the outer spacing in the clamping direction of the set of gripping handles when the clamping member clamps the screw, and the minor axis has a length less than the outer spacing in the clamping direction of the set of gripping handles when the clamping member clamps the screw. According to the above configuration, the holding member has an accommodation recess capable of accommodating the clamping member, and by accommodating the grip handle of the clamping member in the accommodation recess, it is possible to easily prevent the clamping member from spinning freely in response to the rotational drive of the rotation drive device, thereby preventing deformation of the tool hole formed in the head of the screw and improving the workability of the screw tightening operation.

[0010] In addition, the accommodating recess has an open end that accommodates the clamping member and a deep accommodating portion located on the back side of the open end, and the length of the major axis may decrease as it moves from the open end toward the deep accommodating portion. According to the above configuration, the clamping force of the clamping member on the screw can be strengthened by forcing the screw into the workpiece during the screw tightening operation, which effectively suppresses the occurrence of the cam-out phenomenon and prevents deformation of the tool hole formed in the head of the screw.

[0011] The driver bit support portion may be a welded fixing portion formed on one of the pair of clamping jaws and capable of welding the driver bit. According to the above configuration, by welding the driver bit to the welded fixing portion of the clamping jaw, the driver bit can be easily fixed and supported so that it extends in the same direction as the screw advances. Therefore, the screw can be tightened while being pushed in the same direction as the screw advances, which effectively prevents the screw from coming out and prevents deformation of the tool hole formed in the head of the screw.

[0012] The driver bit support portion may support the driver bit so that the driver bit can be removed from the clamping member. According to the above configuration, by removing the driver bit from the clamping member, the clamping member can be used as a standalone tool, thereby increasing the usability of the clamping member.

[0013] The driver bit support portion may be a through hole formed in one of the pair of clamping jaws, through which the driver bit can be inserted and removed. According to the above configuration, the driver bit can be easily removed from the clamping member, which makes it possible to improve the ease of handling and usability of the clamping member.

[0014] In addition, the clamping member may have a rotating shaft that connects the set of clamping jaws to each other so that they can swing, and the set of clamping jaws may swing so that the screw located at the tip of the driver bit can be seen from the direction in which the rotating shaft extends. With this configuration, the operator can tighten the screw while checking the screw located at the tip of the driver bit from the direction of the rotation shaft. Therefore, the operator can tighten the screw while checking that the screw is being pushed straight in the direction of screw entry. This effectively prevents the cam-out phenomenon from occurring and prevents deformation of the tool hole formed in the head of the screw.

[0015] The clamping member may be a pair of pliers. According to the above configuration, a screw turning tool can be constructed by effectively utilizing commonly available pliers, which makes it possible to reduce production costs compared to manufacturing a dedicated tool. [Effects of the Invention]

[0016] According to the screw turning tool of the present invention, it is possible to reduce the workload during screw tightening work and to prevent deformation of the tool hole formed in the head of the screw. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a diagram for explaining an overview of a screw turning tool. [Figure 2] FIG. 1 is a side view of a driver bit and a screw. [Figure 3] FIG. [Figure 4] FIG. 10 is an enlarged view of a main part of the pliers to which the driver bit is welded. [Figure 5] FIG. [Figure 6] 1A to 1C are diagrams showing the flow of a screw tightening method using a screw turning tool. [Figure 7] FIG. 10 is an enlarged view of a main part of the pliers holding a screw. [Figure 8] FIG. 10 is a view showing a screw turning tool during a screw tightening operation. [Figure 9] 10A and 10B are diagrams for explaining an overview of a screw turning tool according to a second embodiment. [Figure 10] FIG. 2 is a side view of the driver bit. [Figure 11] FIG. [Figure 12] 12 is a cross-sectional view taken along the line AA in FIG. 11. [Figure 13] FIG. [Figure 14] 1A to 1C are diagrams showing the flow of a screw tightening method using a screw turning tool. DETAILED DESCRIPTION OF THE INVENTION

[0018] A screw turning tool 1 according to one embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to Figures 1 to 8. However, the embodiment described below is merely an example to facilitate understanding of the present invention and is not intended to limit the present invention. In other words, the present invention can be modified and improved without departing from the spirit thereof, and of course, the present invention also includes equivalents thereof.

[0019] In the following description, the insertion direction A of the screw S refers to the direction in which the screw S is inserted into the workpiece OB, and refers to the left-right direction in Fig. 1. The clamping direction of the screw S refers to the direction perpendicular to the insertion direction A of the screw S, in which the clamping force of the pair of jaws 31Aa, 31Ba of the pliers 3 acts, and refers to the up-down direction in Fig. 1. The viewing direction of the screw S refers to the direction in which the rotation axis of the rotating shaft member 32 extends, and refers to the direction perpendicular to the plane of the paper in Fig. 1.

[0020] <Outline of screw turning tool 1> First, an overview of the screw turning tool 1 will be described. The screw turning tool 1 is used to fasten together two plate-like members that constitute the workpieces OB by rotating a screw S. However, the workpieces OB are not limited to two plate-like members. The workpieces OB may be any members that can be fastened together by a screw tightening operation, and the workpieces OB may be wooden members, resin members, metal members, or a combination of these.

[0021] Fig. 1 is a diagram for explaining an overview of a screw turning tool 1. As shown in Fig. 1, the screw turning tool 1 mainly includes a driver bit 2, pliers 3, a pliers holder 4, and a rotation drive device 5. The screw turning tool 1 can rotate the driver bit 2 and the pliers 3 to which the driver bit 2 is welded and fixed by a rotation drive device 5. Therefore, the worker does not need to rotate the driver bit 2 and pliers 3 himself, which reduces the burden on the worker during screw tightening work.

[0022] Furthermore, the screw turning tool 1 has a driver bit 2 and pliers 3, which extend in the same direction as the entry direction A of the screw S (see FIG. 8), working together to rotate the head S1 of the screw S, thereby driving the screw S into a fastened workpiece OB. Therefore, while the shank S2 of the screw S is pressed in the same direction as the entry direction A of the screw S, a rotational force on the head S1 of the screw S can be applied to both the tool hole S11 (see FIG. 2) and the outer periphery S12 formed in the head S1. Therefore, compared to when the head S1 of the screw S is rotated by the driver bit 2 alone, the occurrence of the cam-out phenomenon of the screw S is suppressed, and deformation of the tool hole S11 can be effectively prevented.

[0023] <Driver Bit 2> 2 shows a side view of the driver bit 2 and the screw S. As shown in FIG. 2, the driver bit 2 mainly comprises a base end 21 that is welded to the pliers 3 and a tip end 22 that is inserted into a tool hole S11 formed in the head S1 of the screw S. The base end 21 has a hexagonal shape in a front view, and fits into the insertion hole 51a (see FIG. 1) of the rotation drive device 5 when inserted into the insertion hole 51a. However, in the screw turning tool 1 according to this embodiment, the base end 21 is fixed by welding to the welded fixing portion 31Ad of the pliers 3 without being inserted into the insertion hole 51a.

[0024] The tip portion 22 has a protrusion that corresponds to the shape of the tool hole S11 of the screw S. In Fig. 2, the tip portion 22 has a plus-shaped (cross-shaped) protrusion when viewed from the front, but is not limited to this. The tip portion 22 may have a minus-shaped, rectangular, or hexagonal protrusion as long as it corresponds to the shape of the tool hole S11 formed in the head S1 of the screw S.

[0025] <Pliers 3> FIG. 3 shows a side view of the pliers 3. As shown in FIG. 3, the pliers 3 have a clamping unit 31 having a first clamping portion 31A and a second clamping portion 31B, and a rotary shaft member 32 that rotatably connects the first clamping portion 31A and the second clamping portion 31B. The pliers 3 clamp the outer periphery S12 (see FIG. 2) of the head S1 of the screw S with the jaws 31Aa of the first clamping portion 31A and the jaws 31Ba of the second clamping portion 31B, which swing around the rotary shaft member 32. As will be described later, the pliers 3 also support the driver bit 2 so that it extends in the same direction as the insertion direction A of the screw S. The pliers 3 correspond to a clamping member.

[0026] The first clamping portion 31A mainly includes a jaw portion 31Aa, a grip handle 31Ab, a rotary shaft insertion hole 31Ac, and a welding and fixing portion 31Ad. The jaw portion 31Aa, together with the jaw portion 31Ba of the second clamping portion 31B (described later), clamps the outer periphery S12 of the head S1 of the screw S during the tightening operation of the screw S, thereby preventing the screw S from spinning out due to the cam-out phenomenon. The inner surface of the jaw portion 31Aa may have a sawtooth structure as an anti-slip structure to prevent the outer periphery S12 from spinning out, but this is not limitative. As long as the frictional force between the inner surface of the jaw portion 31Aa and the outer periphery S12 of the head S1 of the screw S is improved, synthetic rubber may be attached to the inner surface of the jaw portion 31Aa.

[0027] The jaw 31Aa of the first clamping unit 31A and the jaw 31Ba of the second clamping unit 31B clamp the head S1 of the screw S from the clamping direction. Therefore, the worker can visually check the screw S from a direction perpendicular to the clamping direction, in which the shank of the rotating shaft member 32 described below extends (a direction perpendicular to the plane of the paper in FIG. 3). This allows the worker to perform the screw tightening operation while checking that the shank S2 (see FIG. 2) of the screw S is clamped so that it extends in the same direction as the insertion direction A of the screw S.

[0028] The grip handle 31Ab is a grip handle that can swing the jaw 31Aa. The grip handle 31Ab is operated together with the grip handle 31Bb of the second clamping unit 31B, which will be described later, and rotates relative to each other around the rotary shaft member 132, thereby swinging the jaws 31Aa and 31Ba and clamping the head S1 of the screw S. The grip handle 31Ab is configured to be integrated with the jaw 31Aa, but is not limited to this. The jaw 31Aa and the grip handle 31Ab may also be configured as separate bodies.

[0029] The rotary shaft insertion hole 31Ac is a through-hole through which the rotary shaft member 32 is inserted, and is formed between the jaw 31Aa and the grip handle 31Ab (on the proximal end side of the jaw 31Aa). In Fig. 3, the rotary shaft insertion hole 31Ac has a first insertion portion 31Ac1 and a second insertion portion 31Ac2 through which the rotary shaft member 32 is displaceably inserted, but is not limited thereto. The rotary shaft insertion hole 31Ac may have a single insertion portion, or may have three or more insertion portions.

[0030] As shown in FIG. 4 , the welded fixing portion 31Ad is a supporting and fixing portion that supports the driver bit 2 so as to extend in the same direction as the insertion direction A of the screw S. More specifically, the welded fixing portion 31Ad is provided at the base end of the jaw 31Aa of the first clamping portion 31A and protrudes in the insertion direction A of the screw S. The cylindrical welded fixing portion 31Ad is coaxial with the rotation axis AX of the pliers 3 when the pliers 3 are rotated by the rotation drive device 5, which will be described later. Therefore, when the driver bit 2 is welded to the tip of the welded fixing portion 31Ad, the driver bit 2 is supported and fixed so as to be coaxial with the rotation axis AX of the pliers 3 and to extend in the same direction as the insertion direction A of the screw S. Therefore, during a screw tightening operation, the screw S can be pressed into a workpiece OB so that the shank S2 extends in the same direction as the insertion direction A of the screw S, which makes it possible to effectively suppress the occurrence of the cam-out phenomenon.

[0031] The shape of the welded fixing portion 31Ad is not limited to a cylindrical shape. It may be a fitting hole into which the driver bit 2 can be fitted, as long as it can be fixed so that it has the same axis as the rotation axis AX of the pliers 3 and extends in the same direction as the insertion direction A of the screw S. In this case, the driver bit 2 can be welded while fitted into the fitting hole, making it possible to easily fix the driver bit 2. The welded fixing portion 31Ad corresponds to a driver bit support portion.

[0032] The second clamping unit 31B mainly includes a jaw 31Ba, a grip handle 31Bb, and a rotary shaft insertion hole 31Bc. While the first clamping unit 31A includes a welded fixing portion 31Ad, the second clamping unit 31B does not include a structure corresponding to the welded fixing portion 31Ad.

[0033] Jaw 31Ba, together with jaw 31Aa of first clamping unit 31A, clamps outer periphery S12 of head S1 of screw S to prevent spinning of screw S during tightening of screw S. Grip handle 31Bb is operated together with grip handle 31Ab of first clamping unit 31A to rotate around rotary shaft member 132, thereby swinging jaws 31Aa, 31Ba. Rotary shaft insertion hole 31Bc is a through hole through which rotary shaft member 32 is inserted. Jaw 31Aa of first clamping unit 31A and jaw 31Ba of second clamping unit 31B correspond to a pair of clamping jaws, and grip handle 31Ab of first clamping unit 31A and grip handle 31Bb of second clamping unit 31B correspond to a clamping operation unit.

[0034] The rotating shaft member 32 rotatably connects the first clamping portion 31A and the second clamping portion 31B to each other. The rotating shaft member 32 is a shaft member that extends in a direction perpendicular to the rotation axis AX of the pliers 3 and the clamping direction of the jaw portions 31Aa, 31Ba.

[0035] <Pliers holder 4> Fig. 5 shows a perspective view of the pliers holder 4. As shown in Fig. 5, the pliers holder 4 mainly comprises a connecting portion 41 that connects to the rotation drive device 5, which will be described later, and a storage recess 42 that detachably stores the pliers 3. The pliers holder 4 is attached to the rotation drive device 5 and serves to transmit the rotational energy generated by the rotation drive device 5 to the pliers 3 and to prevent the pliers 3 from spinning freely. The pliers holder 4 corresponds to a holding member.

[0036] Connecting portion 41 has a hexagonal shape in front view, and has a size and shape that allows it to be inserted into insertion hole 51a (see FIG. 1) of rotation drive device 5. Therefore, by inserting connecting portion 41 into insertion hole 51a of rotation drive device 5, the rotational energy generated by rotation drive device 5 drives pliers holder 4 to rotate via connecting portion 41.

[0037] The accommodation recess 42 has an open end 42a that forms an accommodation opening for the grip handles 31Ab, 31Bb, and an accommodation inner portion 42b that is located on the inner side of the open end 42a and has a smaller diameter than the open end 42a. Therefore, the accommodation recess 42 can accommodate the grip handles 31Ab, 31Bb of the pliers 3 in the direction opposite to the insertion direction A of the screw S.

[0038] The opening end 42a has an oval shape having a major axis R1 and a minor axis R2. In FIG. 5, the major axis R1 extends in the up-down direction, and the minor axis R2 extends in the left-right direction. The major axis R1 has a length greater than the outer distance W (see FIG. 3) between the grip handles 31Ab and 31Bb when the pliers 3 grip the head S1 of the screw S. On the other hand, the minor axis R2 has a length smaller than the distance W between the pair of grip handles 31Ab and 31Bb when the pliers 3 grip the head S1 of the screw S. Therefore, by arranging the grip handles 31Ab and 31Bb in the major axis direction (the up-down direction in FIG. 5) in FIG. 5 and accommodating them in the accommodating recess 42, the pliers 3 can be prevented from rotating within the accommodating recess 42. This allows the pliers holder 4 to hold the pliers 3 while preventing the pliers 3 from spinning freely when rotated by the rotation drive unit 5.

[0039] The accommodation recess 42 has a cylindrical portion 42c in which the dimensions of the major axis R1 and the minor axis R2 do not change, and a tapered portion 42d in which the dimension of the major axis R1 decreases toward the accommodation inner portion 42b. The hollow cylindrical portion 42c serves to prevent the grip handles 31Ab, 31Bb of the pliers 3 from accidentally falling off the pliers holder 4 and to hold the pliers 3 accurately.

[0040] Meanwhile, the reduced diameter portion 42d presses the grip handles 31Ab, 31Bb of the pliers 3 so as to reduce the gap between them as they are pushed toward the innermost housing portion 42b, thereby increasing the clamping force of the jaws 31Aa, 31Ba of the reduced diameter portion 42d against the screw S, thereby effectively preventing the cam-out phenomenon.

[0041] <Rotational drive device 5> Returning to Fig. 1, the rotation drive device 5 mainly comprises a main body 51, a gripping portion 52, and a power supply 53. The rotation drive device 5 converts the electrical energy supplied by the power supply 53 into rotational energy and drives the driver bit 2 and the pliers 3 to rotate. The rotary drive device 5 is a rotary drive device for an electric impact driver that is available on the market, but is not limited to this. The rotary drive device 5 may also be a rotary drive device for an electric drill driver.

[0042] The main body 51 incorporates an electric motor (not shown) that generates rotational energy. The rotational energy generated by the main body 51 is transmitted to the connecting portion 41 of the pliers holder 4 inserted into the insertion hole 51a, and rotates the driver bit 2 and the pliers 3. Therefore, the worker can tighten the screws in the workpiece OB by operating the rotation drive device 5, thereby reducing the workload during the screw tightening operation. The main body 51 is formed with an insertion hole (bit holder) 51a for connecting the connecting part 41 of the pliers holder 4. When the connecting part 41 is inserted into the insertion hole 51a and the sleeve around the insertion hole 51a is operated, the connecting part 41 is fixed in a connected state to the output shaft of the electric motor.

[0043] The grip portion 52 is a handle member that is operated by an operator by gripping it with one hand. A drive operation button 52a is provided at the upper end of the grip portion 52. Therefore, the operator can start or stop rotational driving by the rotation drive device 5 by gripping the grip portion 52 and operating the drive operation button 52a with the index finger.

[0044] The power supply unit 53 has a secondary battery 53a that supplies electric energy to the electric motor built into the main body unit 51. The power supply unit 53 may also have a primary battery. By configuring the power supply unit 53 with a secondary battery 53a, it becomes possible to make the rotation drive device 5 portable and to eliminate the hassle of battery replacement. Furthermore, power supply unit 53 has an attachment / detachment button 53b for attaching and detaching secondary batteries 53a, which makes it possible to continue work while replacing multiple secondary batteries 53a, thereby improving the convenience of screw tightening work using rotation drive device 5.

[0045] <How to use screw turning tool 1> Next, the flow of a screw tightening operation using the screw turning tool 1 will be described. Fig. 6 shows the flow of a screw tightening operation using the screw turning tool 1. As shown in Fig. 6, first, the pliers holder 4 is attached to the rotation drive device 5 (step S10). Specifically, the connecting portion 41 of the pliers holder 4 is inserted into the insertion hole 51a of the rotation drive device 5 and fixed with a sleeve around the insertion hole 51a, thereby attaching the pliers holder 4 to the rotation drive device 5.

[0046] Next, the driver bit 2 and the screw S are brought into contact with each other, and the head S1 of the screw S is clamped by the pliers 3 (step S11). Specifically, first, the tip portion 22 of the driver bit 2 is inserted into the tool hole S11 of the screw S, thereby bringing the driver bit 2 and the screw S into contact with each other. Next, the outer periphery S12 of the head S1 of the screw S is clamped by the pair of jaws 31Aa, 31Ba of the pliers 3. At this time, the screw S is clamped so that the shank S2 extends toward the insertion direction A of the screw S.

[0047] Fig. 7 is an enlarged view of the main parts of the screw turning tool 1 during a screw tightening operation. Specifically, Fig. 7 shows the screw turning tool 1 in a state in which the driver bit 2 is inserted into the tool hole S11 and the outer periphery S12 of the head S1 of the screw S is clamped by the pliers 3. As shown in Fig. 7, when the screw S is clamped by the pliers 3, the screw S and the driver bit 2 are coaxial with the rotation axis AX of the pliers 3 and extend in the direction A in which the screw S enters. Therefore, the screw S can be tightened into a workpiece OB while being pressed in the same direction as the extension of the shank S2 of the screw S, making it possible to prevent the cam-out phenomenon from occurring.

[0048] Furthermore, the pair of jaws 31Aa, 31Ba of the pliers 3 are perpendicular to the insertion direction A of the screw S and clamp the outer periphery S12 of the head S1 of the screw S from directions facing each other. This allows the worker to perform screw tightening work while visually confirming that the driver bit 2 and the shank S2 of the screw S extend in the same direction from a direction perpendicular to the clamping direction and the insertion direction A. Furthermore, the pair of jaws 31Aa, 31Ba of the pliers 3 clamp the outer periphery S12 of the screw S with their tips at a position substantially equal to the bearing surface S13 of the head S1 of the screw S. This allows the jaws 31Aa, 31Ba of the pliers 3 to clamp the outer periphery S12 of the screw S with sufficient clamping force, and also prevents the fastened workpiece OB from coming into contact with the jaws 31Aa, 31Ba and being damaged.

[0049] Next, the pliers 3 are held by the pliers holder 4 (step S12). Specifically, the pair of grip handles 31Ab, 31Bb of the pliers 3 are accommodated in the accommodation recess 42 of the pliers holder 4, with the pair of grip handles 31Ab, 31Bb aligned in the same direction as the long axis R1 of the accommodation recess 42. Here, by accommodating the pliers 3 so as to be pushed toward the accommodation recess 42b of the pliers holder 4, the clamping force of the pliers 3 on the screw S can be increased.

[0050] Next, the tip portion S21 of the shank S2 of the screw S is positioned at a screw-tightening position of the workpiece OB (step S13). Specifically, with the pliers 3 housed in the pliers holder 4, the tip portion S21 of the screw S is positioned at the screw-tightening position of the workpiece OB. At this time, the worker can visually check the tip portion S21 of the screw S held between the pair of jaw portions 31Aa, 31Ba of the pliers 3 and position the tip portion S21 at the screw tightening position.

[0051] Finally, the rotational drive of the rotational drive device 5 is started, thereby rotating the screw S via the driver bit 2 and the pliers 3 (step S14). Specifically, the drive operation button 52a of the rotational drive device 5 is operated, thereby starting the rotational drive by the rotational drive device 5. As a result, the rotational energy generated by the rotational drive device 5 is transmitted to the driver bit 2 and the pliers 3 via the pliers holder 4, and the tool hole S11 and outer periphery S12 formed in the head S1 of the screw S are rotated.

[0052] 8 shows a state in which a screw S is being fastened into a workpiece OB using the screw turning tool 1. As shown in FIG. 8, the screw S is rotated about the rotation axis AX while the driver bit 2 is inserted into the tool hole S11 and the screw S is clamped by the pliers 3. At this time, the operator pushes the screw turning tool 1 in the direction A in which the screw S enters. This improves the clamping force of the pliers 3 housed in the housing recess 42 of the pliers holder 4 on the screw S, and prevents the pair of jaws 31Aa, 31Ba of the pliers 3 from spinning freely relative to the outer circumferential portion S12 of the screw S.

[0053] The workpiece OB is fastened by the above screw tightening operation. At this time, the screw S is rotated by the rotary drive device 5 via the driver bit 2 and the pliers 3, which reduces the workload of the screw tightening operation. In addition, the outer periphery S12 of the head S1 of the screw S is clamped between the pair of jaws 31Aa, 31Ba of the pliers 3, and the pliers 3 are prevented from spinning freely by the pliers holder 4. This suppresses the cam-out phenomenon of the screw S and makes it possible to prevent deformation of the tool hole S11 formed in the head S1 of the screw S.

[0054] The above describes a screw turning tool 1 according to one embodiment of the present invention, but the above-described embodiment is merely an example to facilitate understanding of the present invention and does not limit the present invention. In the above-described embodiment, the driver bit 2 is described as being supported by the pliers 3 in a state where it is welded and fixed to the welded fixing portion 31Ad of the pliers 3, but this is not limiting. The driver bit 2 may be supported so as to be detachable from the pliers 3. In this case, by removing the driver bit 2 from the pliers 3, the pliers 3 can be used as a standalone tool.

[0055] <Thread Turning Tools 101 Overview> 9 is a diagram illustrating an overview of a screw turning tool 101 according to a second embodiment. As shown in FIG. 9, the screw turning tool 101 mainly includes a driver bit 102, pliers 103, a pliers holder 104, and a rotation drive unit 5.

[0056] As in the above-described embodiment, the screw turning tool 101 rotates the driver bit 102 and the pliers 103 having a through hole 131Ad (see FIG. 11) that supports the driver bit 102 using the rotation drive device 5. This reduces the workload on the worker during screw tightening work and prevents deformation of the tool hole S11 formed in the head S1 of the screw S. Furthermore, by detaching the driver bit 102 from the pliers 103, the pliers 103 can be used as a standalone tool.

[0057] <Driver Bit 102> 10 shows a side view of the driver bit 102. As shown in FIG. 10, the driver bit 102 has a base end portion 121, a long shaft portion 122, and a tip end portion 123.

[0058] The base end 121 is a connector that connects the driver bit 102 to the rotation drive device 5 and the pliers holder 104. More specifically, the base end 121 has a hexagonal shape when viewed from the front, and is fitted into an insertion hole 51a (see FIG. 9) of the rotation drive device 5 to connect to the rotation drive device 5. This allows the rotational energy generated by the rotation drive device 5 to be transmitted to the driver bit 102. The base end 121 is also fitted into a connecting hole 142e (see FIG. 13) that is a through-hole formed in the pliers holder 104, and is connected to the pliers holder 104. This allows the rotational energy generated by the rotation drive device 5 to be transmitted to the pliers holder 104.

[0059] The long shaft portion 122 is a long shaft member that connects the base end portion 121 and the tip end portion 123. The long shaft portion 122 has a circular shape when viewed from the front, and can be inserted into a through hole 131Ad (see FIGS. 11 and 12) formed in the pliers 103. The tip portion 123 has a protrusion that corresponds to the shape of the tool hole S11 of the screw S. In other words, the tip portion 123 has a plus-shaped protrusion when viewed from the front, but is not limited to this and may have a minus-shaped or hexagonal protrusion.

[0060] <Pliers 103> Fig. 11 shows a side view of the pliers 103. As shown in Fig. 11, the pliers 103 have a clamping portion 131 having a first clamping portion 131A and a second clamping portion 131B, and a rotary shaft member 132 that rotatably connects the first clamping portion 131A and the second clamping portion 131B. The pliers 103 correspond to a clamping member.

[0061] The first clamping unit 131A mainly comprises a jaw 131Aa, a grip handle 131Ab, a rotary shaft insertion hole 131Ac, and a through-hole 131Ad. The jaw 131Aa, the grip handle 131Ab, and the rotary shaft insertion hole 131Ac are the same as those in the first embodiment described above, and therefore detailed description thereof will be omitted.

[0062] The through hole 131Ad is coaxial with the rotation axis AX when the pliers 103 are rotated by the rotary drive device 5, and extends in the same direction as the insertion direction A of the screw S. As shown in Fig. 12, which is a cross-sectional view taken along line AA in Fig. 11, the through hole 131Ad has a diameter that allows the driver bit 2 to be inserted. Therefore, the through hole 131Ad can support the driver bit 102 so that it extends in the same direction as the insertion direction A of the screw S, which allows the screw S to be inserted perpendicularly into the workpiece OB, making it possible to prevent the cam-out phenomenon from occurring.

[0063] Furthermore, the through hole 131Ad supports the driver bit 2 so that it can be inserted and removed. Therefore, by removing the driver bit 2 from the through hole 131Ad, the pliers 103 can be used as a standalone tool. Therefore, by combining the pliers 103 with the driver bit 102 and the rotation drive device 5, it can be used as a screw turning tool 101, and by separating the pliers 103 from the driver bit 102 and the rotation drive device 5, it can be used as a standalone, highly versatile clamping tool.

[0064] The second clamping unit 131B has the same configuration as the first embodiment except that it does not have a through hole 131Ad and has a smaller thickness (dimension in the left-right direction in FIG. 12) than the first clamping unit 131A, and therefore a detailed description thereof will be omitted. Jaw 131Aa of first clamping unit 131A and jaw 131Ba of second clamping unit 131B correspond to a pair of clamping jaws, and grip handle 131Ab of first clamping unit 131A and grip handle 131Bb of second clamping unit 131B correspond to a clamping operation unit.

[0065] <Pliers holder 104> Fig. 13 shows a perspective view of pliers holder 104. As shown in Fig. 13, pliers holder 104 mainly comprises a storage recess 142 that detachably stores pliers 103. Pliers holder 104 corresponds to a holding member.

[0066] Similar to the above-described embodiment, the accommodation recess 142 has an open end 142a, an inner accommodation portion 142b, and a connecting hole 142e. The open end 142a has an elliptical shape with a major axis R1 and a minor axis R2. This allows the pliers holder 104 to transmit the rotational energy generated by the rotation drive unit 5 to the pliers 103 without causing the pliers 103 to spin freely.

[0067] The accommodation recess 142 has a cylindrical portion 142c whose major axis R1 and minor axis R2 dimensions do not change, and a reduced-diameter portion 42d whose major axis R1 dimension decreases toward the accommodation innermost portion 142b. As described above, the pliers 103 accommodated in the accommodation innermost portion 142b are held securely by the cylindrical portion 142c, preventing accidental dropping out, and the reduced-diameter portion 42d increases the clamping force on the screw S, making it possible to prevent the cam-out phenomenon from occurring.

[0068] Connecting hole 142e is a through-hole having a hexagonal shape in a front view, and when driver bit 102 is inserted, base end portion 121 of driver bit 102 fits into connecting hole 142e. Therefore, the rotational energy generated by rotation drive device 5 is transmitted to pliers holder 104 via base end portion 121 of driver bit 102. The rotation drive device 5 is the same as that in the first embodiment described with reference to FIG. 1, and therefore a detailed description thereof will be omitted.

[0069] <How to use screw turning tools 101> Next, the flow of a screw tightening operation using the screw turning tool 101 will be described. Fig. 14 shows the flow of a screw tightening operation using the screw turning tool 101. As shown in Fig. 14, first, the driver bit 102 is inserted into the through hole 131Ad of the pliers 103 (step S20). Specifically, the tip 123 of the driver bit 102 is inserted into the through hole 131Ad of the pliers 103 in the insertion direction A of the screw S.

[0070] Next, the driver bit 102 and the screw S are brought into contact with each other, and the head S1 of the screw S is clamped by the pliers 103 (step S21). Specifically, first, the tip portion 123 of the driver bit 102 is inserted into the tool hole S11 of the screw S, so that the driver bit 102 comes into contact with the screw S. Next, the outer periphery S12 of the head S1 of the screw S is clamped by the pair of jaws 131Aa, 131Ba of the pliers 103. At this time, the screw S is clamped so that the tip portion S21 extends in the insertion direction A.

[0071] 8, the driver bit 102 extends coaxially with the rotation axis AX of the pliers 103 in the insertion direction A of the screw S. This prevents the fastening force applied to the screw S from being applied in a direction different from the insertion direction A of the screw S, making it possible to fasten the screw S perpendicularly to the workpiece OB and to prevent the cam-out phenomenon from occurring. Furthermore, the worker can perform the screw tightening work while visually checking that the driver bit 2 and the screw S extend in the same direction. Therefore, it is possible to achieve both work quality and workability in the screw tightening work.

[0072] Next, the pliers 103 are held by the pliers holder 104 (step S22). Specifically, the pair of grip handles 131Ab, 131Bb of the pliers 103 are accommodated in the accommodating recess 142 of the pliers holder 104 from the opening end 142a toward the inner accommodating portion 142b, with the pair of grip handles 131Ab, 131Bb aligned in the same direction as the long axis R1 of the accommodating recess 142. At the same time, the base end 121 of the driver bit 102 is inserted into the connecting hole 142e of the pliers holder 104.

[0073] Next, the tip portion S21 of the shank S2 of the screw S is positioned at a screw-tightening position of the workpiece OB (step S23). Specifically, with the pliers 3 housed in the pliers holder 4, the tip portion S21 of the screw S is positioned at a screw-in position of the workpiece OB.

[0074] Finally, the rotational drive of the rotational drive device 5 is started, thereby rotating the screw S via the driver bit 102 and the pliers 103 (step S24). Specifically, the drive operation button 52a of the rotational drive device 5 is operated, thereby starting the rotational drive by the rotational drive device 5. As a result, the rotational energy generated by the rotational drive device 5 is transmitted to the driver bit 102 and the pliers 103, and the tool hole S11 and outer periphery S12 formed in the head S1 of the screw S are rotated.

[0075] The workpieces OB are fastened by the above-described screw tightening operation. As in the above-described embodiment, the screw S is rotationally driven by the rotary drive device 5 via the driver bit 102 and the pliers 103, which reduces the workload involved in the screw tightening operation. Furthermore, the occurrence of the cam-out phenomenon of the screw S is suppressed, and deformation of the tool hole S11 formed in the head S1 of the screw S can be prevented. Furthermore, by removing the driver bit 102 from the pliers 103, the pliers 103 can be used as a standalone tool.

[0076] In the above embodiment, the screw S is clamped by the pliers 3, but the present invention is not limited to this. Of course, the screw S may be clamped by pliers. In the above-described embodiment, the driver bit 2 is fixed and supported by welding to the welded fixing portion 31Ad provided on the jaw portion 31Aa of the pliers 3, but this is not limiting. The pliers 3 may have a fitting fixing portion (e.g., a chuck) that corresponds to the base end portion 21 of the driver bit 2. This allows the driver bit 2 to be supported more accurately. [Explanation of symbols]

[0077] 1 Screw turning tool 2 screwdriver bits 21 Proximal end 22 Tip 3 Pliers (clamping member) 31 Clamping part 31A First clamping part 31Aa Jaw (clipping jaw) 31Ab Grasping Handle 31Ac Rotating shaft insertion hole 31Ac1 First insertion part 31Ac2 Second insertion part 31Ad Welded fixing part (driver bit support part) 31B Second clamping part 31Ba Jaw (clipping jaw) 31Bb Grasping Handle 31Bc Rotating shaft insertion hole 32 Rotating shaft member 4 Pliers holder (holding member) 41 Connecting part 42 Recessed storage area 42a Open end 42b Inner Containment 42c Cylindrical part 42d Reduced diameter part 5 Rotational drive unit 51 Main body 51a Insertion hole 52 Gripping part 52a Drive operation button 53 Power supply section 53a secondary battery 53b Detachable button 101 Screw turning tool 102 Driver Bit 121 Proximal end 122 Long shaft part 123 Tip 103 Pliers (clamping member) 131A First clamping part 131Aa Jaw 131Ab Grasping Handle 131Ac Rotating shaft insertion hole 131Ad Through hole (driver bit support part) 131B Second clamping part 132 Rotating shaft 104 Pliers holder (holding member) 142 Receiving recess 142a Open end 142b Inner Containment 142c Cylindrical part 142d Diameter-reduced part 142e Connecting hole AX Rotation axis OB Fastened member R1 Long axis R2 Short axis S Screw S1 Head S11 Tool hole S12 Outer peripheral part S13 Seating surface S2 Shaft part S21 Tip part

Claims

1. A screw turning tool used to fasten workpieces by turning a screw having a tool hole formed in a head portion thereof, a driver bit having a protrusion corresponding to the tool hole; a clamping member having a set of clamping jaws, a clamping operation unit that swings the set of clamping jaws to clamp the head of the screw, and a driver bit support unit that supports the driver bit so that it extends in the same direction as the insertion direction of the screw; a rotation drive device that rotates the driver bit and the clamping member; a holding member that detachably holds the clamping member and restricts free rotation of the clamping member in response to rotational driving by the rotation drive device.

2. The clamping operation portion is a pair of grip handles that are integrally formed with the pair of clamping jaws and can swing the pair of clamping jaws, the holding member has an accommodating recess capable of accommodating the set of grip handles in a direction opposite to the inserting direction of the screws, The accommodating recess has an elliptical shape having a major axis and a minor axis, the long axis has a length greater than the outer distance between the pair of grip handles in the clamping direction when the clamping members clamp the screw, 2. The screw turning tool according to claim 1, wherein the short shaft has a length that is smaller than the outer spacing in the clamping direction of the pair of grip handles when the clamping members clamp the screw.

3. The accommodating recess has an open end portion for accommodating the clamping member and a deep accommodating portion located on the deep side of the open end portion, 3. The screw turning tool according to claim 2, wherein the length of the major axis decreases from the opening end toward the innermost portion of the housing.

4. 2. The screw turning tool according to claim 1, wherein the driver bit support portion is a welded fixing portion formed on one of the pair of clamping jaws and to which the driver bit can be welded.

5. 2. The screw turning tool according to claim 1, wherein the driver bit support portion supports the driver bit so that the driver bit can be removed from the clamping member.

6. The screw turning tool according to claim 5, wherein the driver bit support portion is a through hole into which the driver bit can be inserted and removed.

7. The clamping member has a rotation shaft that swingably connects the pair of clamping jaws to each other, 2. The screw turning tool according to claim 1, wherein the pair of clamping jaws swings so that the screw located at the tip of the driver bit can be seen from the direction in which the rotation shaft extends.

8. 2. The screw turning tool according to claim 1, wherein the clamping member is a pair of pliers.

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