JP2004136442A - Portable tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly operative power tool with which holding positions of a hook for the tool body can be easily varied among a plurality of positions. <P>SOLUTION: The power tool consists of a barrel and a handle hanging from the barrel. The barrel houses a motor and a retarding mechanism for reducing rotary dynamic power of the motor and transmitting to the tool at the tip. The upper part of the barrel housing the motor is equipped with the hook consisting of a hook holding part having a first engaging tooth, a shaft inserted into the hook holding part and having a second engaging tooth to be engaged with the first tooth, and a hanging piece extending from the shaft in an L-shape. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a portable tool having a hook portion that can be hooked on a waist belt or the like of an operator.

(4) The conventional power tool is provided with a hook portion for hanging the power tool on a waist belt or the like of an operator. If the hook portion is fixedly arranged, for example, protruding from the power tool main body, the hook portion comes into contact with peripheral members or the like during work. In particular, when the work is performed in a narrow place, there is a problem that the hook portion is in the way and the workability is reduced. In addition, there is a problem that the hook portion is lost if the hook portion is configured to be detachable as necessary, because it hinders the work. Therefore, when the hook portion is not required, the hook portion is housed in the electric tool, or the hook portion is movably provided to a position where it does not hinder the work.

例 One example of the above-described hook portion will be described with reference to FIG. A hook 4 in which a soft material 3 is coated on the entire circumference of a hook 2 formed by bending a threaded rod-shaped iron, a holding nut 5 for holding the hook 4, and a housing 1 for preventing the hook 4 from coming off. It is constituted by a retaining nut (not shown) provided in the inside. The hook piece 2 of the hook portion is rotatable from a storage position substantially adjacent to the battery 18 to a gap formed between the hook piece 2b and the handle 9 as shown by a two-dot dashed line. Protrudes so that it can be hooked. Further, since the hook is hooked on a belt or the like in a state where the tip of the hook faces the direction of the center of gravity, stability can be obtained. Therefore, even if the continuous screw attachment 7 is removed from the power tool main body and the position of the center of gravity of the power tool changes, the hook piece By rotating 2b, it can be adjusted to a stable position. Further, since the hook hooking piece is most likely to protrude to the side, even if the power tool is placed on an inclined surface such as a roof which is inclined by the hook 4 covered with the soft material 3, the soft material 3 As a result, the soft material 3 acts to prevent the member from being damaged when the electric tool is placed on a member such as a decorative board.

Further, as disclosed in Japanese Patent Application Laid-Open No. 2000-167785, there is a type in which the entire hook is slidably housed in a recess provided in the power tool main body from a state in which the hook portion is protruded and fixed.

Although not of the above-mentioned retractable type, as an example of easily moving the hook portion, as disclosed in Japanese Patent Application Laid-Open No. 6-285774, the electric tool rotates around the outer periphery of a substantially cylindrical motor housing. Some hooks are possible and can be positioned at a plurality of locations by locking the hooks.

In addition, as disclosed in Japanese Patent Application Laid-Open No. 9-225861, a rotatable hook portion provided with a convex portion or a concave portion which can be fitted to the left side surface of a motor housing provided with a convex portion or a concave portion is provided. Some hooks are detachable with a single touch.

On the other hand, bits such as bits need to be replaced because they are easily damaged by screw tightening work.However, it is necessary to replace the bits with the bits placed on the ground one by one on a stepladder or at a high place on a scaffold. Is troublesome. Also, if a replacement bit is put in the pocket, there is a high possibility that the bit will be dropped and lost when taking out a screw or the like from the pocket. For this reason, as disclosed in Japanese Patent Application Laid-Open No. 9-216171, there is provided an electric tool capable of storing a replacement bit in a housing. This bit storage part has ribs protruding all around the four sides of the bit so that the bit does not catch on clothes etc. and falls on both sides of the battery receiving part provided at the bottom of the handle, and the bit is almost completely A bit storage part to be buried is formed. In addition, a locking metal fitting for holding the bit at one place is provided in the bit storage portion, and when the bit is taken out, the locking metal fitting is bent so as to be pulled out in the bit axis radial direction. .

JP 2000-167785 A

JP-A-6-285774 JP-A-9-225861

The hook portion shown in FIG. 17 has a problem in that it is necessary to rotate the holding nut with a tool such as a wrench every time when the hook is stored, pulled out, and adjusted in position, which is troublesome.

Further, the hook portion disclosed in Japanese Patent Application Laid-Open No. 2000-167785 has a configuration in which the hook is stable and can easily be pulled out and stored, but a storage portion in which the hook can be stored inside the main body above the motor. Since the guide portion on which the hook can slide and the support portion for supporting the hook must be embedded, there is a problem that the size of the power tool increases.

In the hook portion disclosed in Japanese Patent Application Laid-Open No. 6-285774, the hook rotates about the axis of a substantially cylindrical motor housing of the power tool, and projects with a constant gap from the outer periphery of the motor housing. . However, since a leaf spring that elastically locks a gear provided on the hook is used, there is a problem in that when a force is applied in the rotating direction, the hook is easily rotated and the stability is poor. Further, when the hook is fixed by a manually operated lock knob, it is necessary to rotate the hook with the other hand in a state where the lock is released with one hand, so that there is a problem that the operation is poor.

Also, the hook portion disclosed in Japanese Patent Application Laid-Open No. 9-225861 is designed so that a small object can be hooked in a gap between the hook and the motor housing, and a large object can be hooked in a gap between the hook and the handle. This is to change the attachment position of the hook. However, since the rotation is held by the elastic locking of the materials, when a force is applied in the rotation direction, the hook is easily rotated and the stability is poor. In addition, a holding part that allows the hook to be attached and detached with one touch is provided on the left side of the motor housing, but in order to improve usability for both right-handed and left-handed workers, it is necessary to provide a holding part on the right side of the motor housing. In this case, there is a problem that the holding portion on the side where the hook is not attached becomes a hindrance to the work.

On the other hand, as disclosed in Japanese Patent Application Laid-Open No. 9-216171, it is composed of a motor housing containing a motor and a gear, a handle, a battery, a battery receiving portion, and a bit storage portion. Considering the position where the bit housing should be provided, the motor housing has no space for burying the bit inside, and the motor housing is slid into a narrow place to perform the screw tightening operation, so it is inappropriate to protrude the motor housing. However, if it is provided on the handle, it is difficult to grasp, and if it is provided on the battery, the versatility of the battery is reduced, and there is no space to be embedded in the battery receiver. For this reason, it is desirable that the bit storage portion is configured to protrude from the battery receiving portion. However, when such a power tool is provided with a hook as shown in FIG. 17, for example, the hook pull-out piece (FIG. 17) collides with the bit storage section and hinders the draw-out piece (FIG. 17). However, there is a problem that the portable tool is not compact and the space efficiency is poor even if it is provided on the side. Further, if the locking fitting disclosed in Japanese Patent Application Laid-Open No. 9-216171 is used, cost and assembling time are required. Therefore, it is desirable that the locking portion is formed of resin integrally with the housing. When resin is used, it is necessary to increase the wall thickness so that the bit can be held because the resin is weaker than iron, and it is necessary to reduce the wall pressure so that it can be bent and the bit can be attached and detached. There was a problem. In addition, in an example of a portable tool in which a soft material is provided on a hook shown in FIG. 17, a cap-shaped soft material is covered on the entire circumference of a hook piece. For example, the hook piece is disclosed in JP-A-9-216171. In the case where the disclosed bit storage portion is provided, the bit is covered with a soft material and cannot be removed, or even if a part of the soft material is cut out, the bit is cut out by a mounting work or abrasion. There was a problem of cracking.

の An object of the present invention is to solve the above problems and to provide an electric tool with excellent operability in which the position of a hook with respect to a tool body can be easily changed. That is, an object of the present invention is to provide a power tool having a hook that can be attached to a holding portion at a plurality of positions in a circumferential direction and that is securely held in a circumferential direction.

In order to achieve the above object, the present invention comprises a main body part and a handle part hanging down from the main body part. The main body part has a motor, and the rotational power of the motor is reduced and transmitted to the tool bit. A power holding tool having a first engaging tooth at an upper portion of a main body portion housing the motor, the first tool being inserted into the hook holding portion; One feature is that a hook including a shaft portion having second engagement teeth engaged with the false teeth and a hook piece extending in an L shape from the shaft portion is provided.

Another feature of the present invention is that an elastic body for urging the hook toward the main body, and the hook is moved in the axial direction against the elastic body, and the first and second engagement teeth are provided. And a hook preventing means for preventing the hook from coming off the hook holding portion when the engagement of the hook is released.

Another feature of the present invention is that the second engagement tooth is a gear portion projecting in a plurality of diameters of the shaft portion, and the first engagement tooth is a ring gear projecting into the hook holding portion. And wherein the angle of the hook is variable depending on the position at which the first and second engaging teeth are engaged.

Another feature of the present invention is that a protrusion is formed on the shaft portion for regulating a rotation range of the hook, and a hole of the hook holding portion into which the shaft portion is inserted is engaged with the protrusion. Is formed.

ADVANTAGE OF THE INVENTION According to this invention, the hook which has the hook holding part provided with the engaging tooth provided in the housing, the shaft part provided with the fitting tooth which is inserted in a hook holding part and meshes with an engaging tooth, A hook portion that is constituted by an elastic body that constantly urges the hook portion, and a hook retaining portion that is rotatable by moving the hook in the axial direction against the elastic body and releasing the engagement. Thus, it is possible to provide an electric tool excellent in operability that can easily change the position of the hook with respect to the tool body. Further, by holding a tip tool such as a bit in the holding portion provided on the hook, it is possible to provide an electric tool that can improve workability and effectively use space. Further, a bit and the like in the storage portion can be securely held, and an easy-to-use hook that can be easily removed and has excellent usability and a method of attaching and detaching the hook can be provided.

The power tool such as an impact driver according to the present embodiment will be described with reference to FIGS. 1 and 2 are enlarged exploded perspective views of a main part showing a hook portion of the power tool according to the present embodiment, FIG. 3 shows a movable state of the hook portion in the present embodiment, (A) is a front view, and (B) is a front view. ) Is a side view (C) is a bottom view, FIG. 4 is a cross-sectional view taken along line AA of FIG. 3 (A), and FIG. 5 shows a state in which the hook portion in the present embodiment is moved in a direction to compress the spring 27. FIG. 3A is a sectional view taken along line AA of FIG. 3, FIG. 6 is an external perspective view showing a state in which the hook portion according to the present embodiment is mounted on the opposite side, and FIG. 8 is a sectional view taken along line BB of FIG. 4, FIG. 8 is a sectional view taken along line cc of FIG. 4, and FIG. FIG. 9 is a partially enlarged view showing a ring gear, and FIG. FIG. 10 shows a state in which the power tool is hooked on the waist belt of the worker using the hook portion, and FIG. 10A shows a state in which the power tool is hooked on the waist belt of the worker. (B) is an explanatory view showing a state in which a bit is removed from the electric tool shown in (a) and a chuck and a woodworking cone are attached, and (c) is a light-weight battery attached to the electric tool shown in (a). FIG. 11 shows an electric circular saw provided with a hook portion in the present embodiment, (a) is a partially longitudinal side view, and (b) is an electric circular saw in a beam. FIG. 12 shows an electric drill provided with a hook portion in this embodiment, in which FIG. 12 shows an electric drill provided with a hook portion, (a) is a partially longitudinal front view, (b) is a partially omitted plan view, and (c). FIG. 13 is a sectional view taken along the line dd of FIG. 13B, and FIG. 13 shows another example of the hook portion in this embodiment. FIG. 14 is an enlarged sectional view of a main part showing still another example of a hook part in the present embodiment. FIG. 15 is a view showing a bit storage part provided in the hook part in the present embodiment. ) Is a sectional view taken along line AA, and FIG. 16 is a partial external perspective view showing a hook portion for storing the bit.

As shown in FIG. 3, an impact driver having an outer frame such as a split housing 1 (hereinafter, referred to as a housing) and a hammer case 8 has a substantially T shape, and a main body formed by the housing 1. In order to supply electric power to the motor 15 to accommodate a motor 15 which is an electric or pneumatic drive source, a planetary gear portion 18 which constitutes a speed reduction mechanism portion, and a handle portion hanging down from the main body portion. And a contact electrically connected to a connection terminal of the storage battery. A hammer case 8 disposed in contact with the housing 1 accommodates a striking mechanism for converting the rotational power of the motor 15 into striking force, and a tip tool holder such as a bit or a wrench.

In such a configuration, the rotational power of the motor 15 is transmitted from the pinion, which is the output shaft of the motor 15, to the speed reduction mechanism, and the rotation force and the impact force are transmitted from the speed reduction mechanism to the tip tool 17 via the impact mechanism. Have been.

The impact mechanism is provided on the spindle 16, a hammer 23 rotatable via a steel ball (steel ball) inserted into a cam groove formed in the spindle 16, and movable in the axial direction of the rotating shaft, and the hammer 23. An anvil 22 having an anvil claw that is rotated by being hit by a plurality of hammer claws, and a spring that constantly urges the hammer 23 toward the anvil 22 is provided.

The planetary gear unit 18 serving as the speed reduction mechanism unit includes a fixed gear support jig, a fixed gear, a planetary gear, and a spindle 16 which are supported with a rotation stopper in the housing 1 and supported by the spindle 16. It is composed of a needle pin serving as a rotating shaft of the planetary gear.

A pulse-like impact (impact) applied to a screw, a nut, or the like, which is tightened by the tip tool 17, supplies electric power to the motor 15 by operating a trigger switch, and drives the motor 15 to rotate. Is transmitted to the spindle 16 via a planetary gear portion 18 (planetary planetary gear, fixed gear) via a pinion connected to the tip of the steel ball, and a steel ball disposed between the cam groove of the spindle 16 and the cam groove of the hammer 23. , The rotational force of the spindle 16 is transmitted to the hammer 23, and the hammer 23 of the hammer 23 urged forward (toward the tool bit) by a spring disposed between the hammer 23 and the planetary gear of the spindle 16. Since the anvil 22 is rotated by the engagement between the pawl and the anvil pawl of the anvil 22, a rotational force is applied to the tip tool 17. It is. When the tightening torque of the screw or the like by the tip tool 17 exceeds a predetermined value, the engagement between the two claws is temporarily released because the hammer claw rides over the anvil claw. That is, when the tightening torque exceeds the predetermined value, the hammer 23 springs. To the motor 15 side (retreat). Thereafter, the hammer 23 is pushed back in the direction of the anvil 22 by the compression force of the spring, and the hammer claw collides with the anvil claw to generate a striking force. By repeating the rotation and the axial movement of the hammer 23 in this manner, a continuous impact torque is given to the tip tool 17.

The surface of the housing 1 of the power tool having the planetary gear portion 18 is coated with an elastomer by two-layer molding. The purpose of providing this elastomer is to prevent slippage for securely gripping the power tool, or to improve grip and improve operability and workability, and to further absorb the impact when dropped on the ground. The purpose is to prevent the power tool from being damaged or to prevent the power tool from sliding down along the slope when the power tool is placed on the inclined surface. Therefore, the elastomer 15 is mainly provided around the handle grip portion of the split housing 1 and the main body portion.

Furthermore, the impact driver is provided with a rotatable hook portion 4 which will be described in detail below in order to hook the impact driver body on a waist belt or the like of an operator. The hook 2 of the hook portion 4 is provided on a cylindrical holding portion 20 extending from a handle portion capable of storing the battery 18 to a position adjacent to a side surface of the battery 18. It has an axial length in the left-right direction (the back side and the near side in (A)) where the end portion 28 is mounted. The support portion 20 of the bolt 44 is inserted into the holding portion 20 from the rear end of the handle 9, and a housing portion for storing the bit 11 is provided in the resin hook 2.

In FIGS. 1 and 2, the hook 4 has an L-shaped hook 2, a substantially cylindrical base end 28 connected to the rear end of the hook 2, and is attached to the base 28. And a retaining portion 29. The base end 28 is provided on the pivot 30 so as to protrude from the hook piece 2 and has a cylindrical rotating cylinder 32 having a gear portion 31 at the distal end. A horizontal cylinder 33 projecting from the diameter and a bolt receiving cylinder 34 projecting from the horizontal cylinder 33 are formed, and a locking projection (not shown) is provided inside the base end portion 28. A bolt hole 36 penetrating from the end face of the bolt receiving tube 34 to the nut storage portion 35 is buried in the nut storage portion 35 and the pivot 30 of the half-six walls. In addition, the gear portion 31 is formed of a plurality of teeth having a surface in the direction of the pivot 30 and protruding radially outward of the pivot 30 from the base end portion 28. Numeral 38 denotes a step between the hook piece 2 and the rotary cylinder 32, and 39 denotes a projection protruding from the rotary cylinder 32. The hook piece 2 is turned toward the opposite side of the handle by pulling the hook piece 2 to disengage the gear portion 31 from the ring gear portion 47. A rotation suppressing plate for restricting a possible rotation range of the hook piece 2 within a predetermined angle, 40 to 40 are C surfaces provided respectively at the gear tips, and 54 and 54 are non-slip. Further, the retaining portion 29 includes a bolt 44 having a bolt head 43 in which a coin groove 42 is embedded, and a nut 45 having a locking mechanism.

On the other hand, the holding portion 20 provided on the housing 1 has a symmetrical shape about the division surface of the housings 1a and 1b. The holding portion 20 has a cylindrical shape, and a rotation support hole 46 that abuts with the rotation cylinder 32 of the hook 4 that together forms a rotation support portion, a ring gear portion 47 into which the gear portion 31 of the hook 4 can be fitted, A spring receiver 48 having a shape symmetric to the ring gear portion 47 and having an end surface in contact with the elastic spring 27, and a spring 27 having a shape symmetric to the rotation support hole 46 and adjacent to the periphery of the bolt receiving cylinder 34 of the hook 4. And a spring hole 49 in which the bolt head 43 can be stored. The ring gear 47 has a surface in the direction of the pivot 30, and the ring gear 47 has a surface in the direction of the pivot 30. Are formed from a plurality of teeth protruding radially inward. In the rotation support hole 46, the rotation prevention plate 39 of the hook 4 abuts, and a rotation prevention plate receiver 52 having a concentric cylindrical shape with the rotation support hole 46 is buried. When the hook 4 is assembled with both the rotation suppressing plate receiver 52 and the rotation suppressing plate 39 in the direction, the distance is formed longer than the distance from the inner surface of the bolt head 43 to the end surface of the spring receiver 48 in the direction of the pivot 30. ing. In addition, a step 38 of the hook 4 is brought into contact with the end face 53 of the holding portion 20 to form a detachment preventing portion. The elastic body may be made of elastic rubber other than the spring 27.

In the impact driver 21 configured as described above, when assembling the hook 4, the nut 45 is inserted into the nut storage portion 35 of the hook 4, and the nut 45 is locked and stored by a locking projection (not shown). The end portion 28 is mounted in the through hole 50 of the holding portion 20 of the housing 1a, 1b which has been screwed so that the hook piece 2 is parallel to the bottom surface of the battery 18, and the spring 27 is further mounted in the spring chamber from the large diameter direction. When the bolt 44 is inserted into the bolt hole 36 in the state of being inserted into the bolt 49, a flathead screwdriver or a coin is fitted into the coin groove 42 and tightened until the bolt head 43 comes into contact with the end face of the bolt receiving cylinder 34 on the nut 45. The hook 4 is assembled to the housing 1 with the spring 27 interposed. In addition, since the nut 45 is a nut with a locking function, there is no danger that the screw 44 will be loosened and the hook 4 will be detached from the housing 1. At this time, since the holding portion 20 is symmetrical with respect to the divided surfaces of the housings 1a and 1b, the hook 4 is also mounted from the opposite direction of the holding portion 20 according to the dominant arm of the worker as shown in FIG. It is possible, and even if the mounting direction changes, the role of the part in the holding part 20 is changed only except for the ring gear part 47. Therefore, the holding part 20 is almost one even if the hook 4 has two mounting positions. In other words, there is no need to provide two places, and the impact driver 21 becomes compact. Further, at this time, as shown in FIGS. 1 and 2, since the nut 45 which is a general-purpose component is inserted into the nut storage portion 35 in the hook 4, the nut or the like is fitted into a mold and resin molding is performed. It is less costly than the method of molding and machining the entire end portion 28 with metal, and is more durable than the method of screwing it to the resin molded housing 1 because it is fastened and fixed with the bolt 44 and the nut 45. High.

FIG. 4 shows a stored state in which the hook 2 of the hook 4 is stored at a position substantially adjacent to the side surface of the battery 18. The hook 4 is hooked in the direction in which the bolt head 43 is pushed out, with the pressure of the spring 27 as a fulcrum about the end face of the spring receiver 48 in the holding part 20, and the step 38 of the hook 4 abuts on the end face 53 of the holding part 20 to support the hook 4. As a result, the hook 4 is prevented from being disengaged, and the gear portion 31 is held in a fitted state with the ring gear portion 47. Therefore, the rotation of the pivot 30 of the base end portion 28 in the circumferential direction is prevented, and at the same time, during storage, Stability is achieved.

When the hook 4 is used from here, the hooks 4 are held as shown in FIG. 5 by grasping the non-slip portions 54, 54 on the pivot 30 with fingers and pulling them out in the direction of the pivot 30 (upward in the figure). The hook 4 can be rotated because the gear part 31 and the ring gear part 47 are released from fitting together with being able to move laterally from the part 20. However, in this state, since the bolt head 43 is locked to the end surface of the spring receiver 48 via the compressed spring 27, the hook 4 is prevented from being released to the side. Also, when the hook 4 is pulled out, the spring 27 can be compressed to a thickness of the wire diameter because of the mortar shape, so that a large amount of the hook 4 can be drawn out. it can. 5A, the hook 4 is rotated so that the tip of the hook piece 2 faces upward as shown in FIG. 3A, and the hook piece 2 is moved to the center of gravity of the impact driver 21 as shown in FIG. When the finger is released at a position 2e pointing near 55, the pressure of the spring 27 is applied in the direction of pushing out the bolt head 43 with the end face of the spring receiver 48 in the holding portion 20 as a fulcrum as shown in FIG. And the ring gear portion 47 are fitted, the step 38 is in contact with and supported by the end face 53, and the hook 2 is stably fixed at the position 2e in FIG. When the hook 4 is rotated, as shown in FIG. 5, the rotary cylinder 32 abuts on the rotation support hole 46 and slides, so that the hook 4 can always be rotated on the substantially pivot 30 and a plurality of teeth are geared. The gear portion 31 and the ring gear portion 47 are provided on the ring portion 47, and the C surfaces 40 to 40 of the gear portion 31 play a role of peeping. It is easy to do. In addition, the C surfaces 40 to 40 also have an effect of preventing the distal end of the gear portion 31 from being lost. Although the impact driver 21 is not provided in the mold dividing structure, the C surface may be provided at the distal end of the ring gear 47. Even in the event that the gear 31 and the ring gear 47 do not fit together just by removing the finger, the hook 4 can be fitted by lightly tapping.

Next, when the hook 4 is not used, the hooks 4 are moved from the holding section 20 to the side by holding the slip stoppers 54 on the pivot 30 with fingers and pulling the hooks 4 laterally in the opposite direction to the above procedure. At the same time, the engagement between the gear portion 31 and the ring gear portion 47 is released, so that the hook 4 can be rotated. Then, the hook 4 is rotated so that the tip of the hook 2 faces forward from the state in which the pulled-out state is held with the finger, and the end surface of the rotation suppressing plate 39 is When the finger is released at a place where the end comes into contact with the end surface, the hook 2 of the hook 4 is stored at a position substantially adjacent to the side surface of the battery 18.

Here, the shapes of the gear portion 31 and the ring gear portion 47 will be described in detail. As shown in FIG. 8 (A), when an operator's force P1 is applied to the tip of the hook 4 in the circumferential direction of the pivot 30, a moment M1 acts on one point of the fitting portion. Is formed on the substantially radial surface of the pivot 30, the moment M1 acting on the teeth of the gear portion 31 can be received substantially vertically by the teeth of the ring gear portion 47, and the rotation of the hook 4 can be suppressed without waste. In addition, since the gear 31 and the ring gear 47 are provided with a plurality of teeth as shown in FIG. 8B, the moment M1 can be dispersed into the moment M2. And can be firmly fitted. Further, as shown in FIG. 1, since the teeth of the gear portion 31 and the ring gear portion 47 are formed on the surface in the direction of the pivot 30, the hook 4 can be laterally moved in the direction of the pivot 30 (see FIG. It does not slide to the front. In addition, since the teeth of the gear portion 31 and the ring gear portion 47 protrude in the radial direction of the pivot 30 from the base end portion 28 and the through hole 50, respectively, the teeth of the gear shaft 31 extend from the end surfaces of the base end portion 28 and the through hole 50. In comparison with the configuration in which the teeth protrude in the direction, the joint area between the teeth and the base end portion 28 and the through-hole 50 can be increased and the bonding strength can be increased. If an attempt is made to achieve the same strength as the joint strength of the protruding teeth, the gear portion 31 and the ring gear portion 47 become large in the radial direction of the pivot 30, resulting in an inappropriate configuration.

Next, FIG. 9 shows a state where the impact driver 21 is hooked on the waist belt 76. FIG. 9 shows a state in which a force P2 in the pulling-out direction is applied to the hook 4 in accordance with the movement of the worker, but since the base end portion 28 and the through hole 50 are fitted, the waist belt 76 When a force P2 is applied to the hooked support point 26, the base end 28 rotates, and moments M3, M3 act on end points 56, 56 of the base end 28 in the circumferential direction of the center 57 thereof. Then, the moments M3, M3 can be decomposed into the forces F1, F1 acting vertically on the inner wall of the through hole 50 and the forces F2, F3 acting in the opposite directions parallel to the pivot 30, respectively, but the forces F2, F3 are canceled out. The base end portion 28 is pressed against the through-hole 50 by forces F1 and F1 acting vertically on the inner wall of the through-hole 50. In other words, since the base end portion 28 is twisted in the through-hole 50 and cannot be pulled out, the hook 4 cannot be pulled out except for pulling it straight out on the pivot 30 with a finger, so that the hook 4 has good stability at the time of catching. In addition, since the impact driver 21 is always gravitationally acting while being hooked on the belt 76, the force P <b> 3 is applied to the hooking piece, and the state where the base end portion 28 is squeezed in the through hole 50 continues.

Further, when the impact driver 21 is hooked on the waist belt 76, as shown in FIG. 10A, the center of gravity 55 of the impact driver 21 is located below the support point 26 of the hook 4, and the hook 2 is It is perpendicular to 76 and stable. In addition, when the woodworking cone 58 and the drill chuck 59 are attached as shown in FIG. 11B, or when the light voltage battery 60 having a low voltage is attached as shown in FIG. 10C, the center of gravity 55 of the impact driver 21 is respectively set. Although it changes to the centers of gravity 61 and 62, since the hook 2 is held at a plurality of positions in the circumferential direction, if the position 2e of the hook 2 is easily rotated to the positions 2d and 2f, respectively, Since the belt 76 is always vertically and deeply hooked, the stability at the time of hooking may be obtained by adding or changing parts. In addition, as described above, the hook 4 cannot be firmly rotated even when a force is applied in the rotation direction, and the hook 4 is not pulled out with the movement of the worker. Will be kept.

Next, the strength of the hook 4 when the impact driver 21 is dropped will be described. When the hook 2 is at the position 2a shown in FIG. 3, the battery 18 absorbs the shock. When the hook 2 is at the positions 2c, 2d, 2e, and 2f, the hook 2 curves and comes into contact with the handle 9, and the handle 9 absorbs the shock. . However, when the hook piece 2 is located at a position other than the positions 2a, 2c, 2d, 2e, and 2f, for example, when a drop impact is received at the position 2g, the hook piece 2 itself must absorb the shock. 2 has a problem that it becomes large. Therefore, as shown in FIG. 7, a rotation suppressing plate 39 is provided at the base end portion 28, and a rotation suppressing plate receiver 52 is provided at the holding portion 20, and the rotational movement range of the hook piece 2 is set at the positions 2a, 2c, 2d, and 2e described above. 2f, the hook 4 can be made compact.

The configuration of the hook described above is a simple method of simply rotating a plurality of position selections, and has good stability when hooked on a belt or the like, and has a compact structure adjacent to a portable tool. Because it can be stored in the impact driver, it is not limited to the illustrated impact driver, there are many cases where there is no empty space in the housing, the installation place of the hook is often limited, circular saw, drill, disc grinder, screwdriver, hammer, It is widely applicable to most portable tools such as jigsaws, cutters, saversaws, air tools, nailing machines, etc., and has high versatility. For example, as shown in FIG. 11, even when a hook for hooking on the beam 63 of the roof is attached to the circular saw 64, the holding portion 20 is protruded from the side of the motor housing 19, and the hook piece 2 is connected to the hook. If the motor housing 19 is configured to be adjacent to the end face of the motor housing 19 with a gap corresponding to the sliding amount of the hook 4, it can be mounted on an electric circular saw, and there is an empty space above the motor as shown in FIG. If the hook 2 is mounted on the drill 65 or a screwdriver, the hook 2 can be formed in an L-shape protruding in parallel with the pivot, and the hook 4 and the entire holding portion 20 can be housed and mounted. FIG. 12 (C) is a cross section taken along line DD of FIG. 12 (B), but a part of the ring gear portion 47 may be omitted in the mold structure. In addition, as described above, the gravity P4 acts on the hook piece 2 when hooking on a beam, a belt, or the like in both the round and the drill, but the hook 4 is prevented from coming off on the end face 53 of the holding portion 20 and is stable. Further, when the hook piece 2 is pulled out from a beam, a belt, or the like, a force P5 acts on the hook piece 2 due to friction. However, since the base end portion 28 of the hook 4 is twisted in the holding portion 20, the hook 4 slides and becomes difficult to pull out. There is no operability.

Further, as shown in FIG. 4, the hook 4 is provided with the base end portion 28 and the housing 1 is provided with the holding portion 20. However, as shown in FIG. The same effect can be obtained even with the configuration in which the portion 28 is provided. Further, as shown in FIG. 14, the housing 1 including the base end portion 28 of FIG. 13 may be replaced with the retaining portion 29, and the rotation supporting the rotation of the rotary cylinder 32 when the hook 4 rotates in FIG. The rotary cylinder 32 may be supported by the ring gear 47 as shown in FIG. In this way, the configuration may be such that the parts are replaced, the parts are subdivided to increase the operation accuracy, or one part combines two effects.

(4) Next, the bit storage configuration and its method will be described. FIG. 1 is a partial explanatory view of an impact driver having a hook. A bit storage portion 66 which is a groove-shaped storage holding portion is recessed in the hook 2 of the hook 4, and the bit storage portion 66 is hexahedral. The bit 11 is stored almost completely. 67 is a fitting portion to which the bit 11 can be fitted, 68 is a neck buried before and after the bit 11, 69 is a stopper which is brought into contact with an elastic flat plate 70 and can elastically lock the neck, 71 is a bit storage portion 1 Notches 72, 73 are the heads of the bit 11, and 74 is a recess on the back surface of the flat plate 70.

On the other hand, when the bit 11 is attached, as shown in FIG. 15, the bit 11 is pushed from the rear of the bit storage portion 66 (right side in the drawing) in the direction of the bit axis 75 by the finger and slides, and the bit 11 is fitted. At the same time, the stopper 69 is elastically engaged with the neck 68 of the bit 11, and the bit 11 is assembled with the hook 4. FIG. 4 is a view showing a state in which the bit 11 is housed in the hook 4, and FIG. 4B is a sectional view taken along the line EE of FIG. 4A. The bit 11 is held in the fitted state to the fitting portion 67, and the bit 11 is prevented from swinging in the circumferential direction and the radial direction of the bit shaft 75. In addition, since the stopper 69 is elastically engaged with the neck 68 to prevent the bit shaft 75 from swinging in the axial direction, the stability is also good. Further, since the bit 11 is stored in the edge portion and the surface position of the hook 2, that is, the bit 11 is completely embedded so that the outer periphery of the bit 11 does not protrude from the bit storage portion 66, the bit 11 is hooked on clothes or the like. There is no risk of detachment, and it is excellent in safety. Next, as shown in FIG. 15, when pulling out the bit 11, a finger is inserted through the notch 71 of the bit storage portion 66 and the head 72 is slid backward (to the right in the drawing), so that the stopper 69 or the flat plate 70 is moved. The flat plate 70 is pressed by the head 72, the flat plate 70 is curved, the locking by the stopper 69 is released, and the head 73 can be protruded rearward from the bit storage portion 66. If the head 73 is pulled out with fingers, Bit 11 is pulled out of hook 4. At this time, the elastic pressure of the flat plate 70 is reduced by the recess 74, and even if the hook 2 is in contact with the side surface of the battery 18, the curved flat plate 70 does not hit the side surface of the battery 18.

Therefore, as described above, in a portable tool having a hook and a bit storage portion, space efficiency is improved by replacing the hook hook with the bit storage portion. Further, the method is such that the bit is slid in the bit axis direction to be attached and detached, and is divided into locking means for preventing rocking in the circumferential and radial directions of the bit axis and elastic locking means for preventing rocking in the bit axis direction. This makes it possible to form the hook integrally with the resin, so that cost and assembling time are not required.

Further, as shown in FIG. 16, if a soft body 3 to 3 such as rubber for preventing slippage or protection of members is press-fitted or adhered to one part of the edge of the hook piece 4 or formed by two layers, the bit can be stored. It becomes possible to provide a soft material to the hook provided with the portion. Note that a method of applying a soft paint may be used.

From the above, the configuration of the bit storage is good in space efficiency and uses the locking means of resin integral molding which does not require cost and assembling labor. Therefore, not only the impact driver illustrated but also the round type using the bit is used. The present invention can be widely applied to portable tools such as screwdrivers, driver drills, and pneumatic tool drivers.

It is a principal part expansion disassembled perspective view which shows the hook part of the power tool which becomes this invention. It is a principal part expansion disassembled perspective view which shows the hook part of the power tool which becomes this invention. 4A and 4B show a movable state of a hook portion according to the present invention, wherein FIG. 5A is a front view, FIG. 5B is a side view, and FIG. FIG. 3 is a sectional view taken along line AA of FIG. 3A according to the present invention. FIG. 4A is a cross-sectional view taken along the line AA of FIG. 3A, showing a state in which the hook portion according to the present invention is moved in a direction in which a spring 27 is compressed. It is an external appearance perspective view which shows the state which attached the hook part which becomes this invention to the other side. FIG. 5 is a cross-sectional view taken along the line BB of FIG. 4 showing a stored state or a protruded state of the hook portion according to the present invention. 4A and 4B show a rotating portion of a hook portion according to the present invention, wherein FIG. 4A is a cross-sectional view taken along the line cc of FIG. 4, and FIG. 4B is a partially enlarged view showing a gear and a ring gear. It is a principal part enlarged view which shows the state which hooked the electric tool on the waist belt of the worker using the hook part which becomes this invention. FIG. 4A shows a state in which a power tool is hooked on a worker's waist belt by using a hook portion according to the present invention, and FIG. 4A is an explanatory view showing a state in which the power tool is hooked on a worker's waist belt; FIG. 5A is an explanatory view showing a state in which a bit is removed from the power tool shown in FIG. 5A and a chuck and a woodworking cone are mounted, and FIG. 4C is a schematic view showing a state in which a lightweight battery is mounted on the power tool shown in FIG. is there. 1A and 1B show an electric circular saw provided with a hook portion according to the present invention, wherein FIG. 1A is a partially longitudinal side view, and FIG. 1B is a state diagram showing a state where the electric circular saw is hooked on a beam. 1 shows an electric drill provided with a hook portion according to the present invention, in which (a) is a partially longitudinal front view, (b) is a partially omitted plan view, and (c) is a sectional view taken along line dd of (b). FIG. 13 is an enlarged sectional view of a main part showing another example of the hook part in the present embodiment. It is a principal part expanded sectional view which shows the other example of the hook part which becomes this invention. It is a principal part expanded sectional view which shows another example of the hook part which becomes this invention. FIG. 4 is a sectional view taken along line AA of FIG. 3A showing a bit storage portion provided in a hook portion according to the present invention. It is a partial external appearance perspective view which shows the hook part which accommodates the bit which becomes this invention. It is an external appearance perspective view which shows the electric power tool which has the conventional hook.

Explanation of reference numerals

1a is a housing, 1b is a housing, 2 is a hook, 4 is a hook, 11 is a bit, 18 is a battery, 20 is a holding portion, 21 is a cordless impact driver, 27 is a spring, 29 is a retaining portion, 30 is a pivot, 31 is a gear portion, 32 is a rotary cylinder, 35 is a nut storage portion, 36 is a bolt hole, 38 is a step, 39 is a rotation suppressing piece, 44 is a bolt, 45 is a nut, 46 is a rotation support hole, 47 is a ring gear portion, 48 is a spring receiver, 49 is a spring chamber, 50 is a through hole, 52 is a rotation stopper receiving member, 53 is an end face, 54 is a non-slip, 66 is a bit storage part, 67 is a cantilever part, 68 is a neck part, and 69 is a stopper. , 70 are flat plates, 71 is a notch, 72 and 73 are heads, and 75 is a bit axis.

Claims (4)

An electric motor comprising a main body and a handle hanging down from the main body. The main body includes a motor and a reduction mechanism for reducing the rotational power of the motor and transmitting the rotational power to the tool bit. In the tool, a hook holding portion having first engagement teeth on an upper portion of a main body portion in which the motor is housed, and a second engagement member inserted into the hook holding portion and engaged with the first engagement teeth. An electric tool comprising a hook having a shaft portion having a denture and a hook piece extending in an L shape from the shaft portion. 2. The engagement of the first and second engagement teeth according to claim 1, wherein the hook is moved in the axial direction against the elastic body to bias the hook toward the main body, and the hook is moved in the axial direction against the elastic body. An electric power tool comprising: retaining means for preventing the hook from coming off from the hook holding portion when is released. 2. The gear according to claim 1, wherein the second engaging teeth are a plurality of gears protruding in a radial direction of the shaft, and the first engaging teeth are a ring gear protruding into the hook holding part. An electric tool characterized in that the angle of the hook is varied depending on the position where the first and second engaging teeth are engaged. 2. The hook portion according to claim 1, wherein a convex portion for regulating a rotation range of the hook is formed on the shaft portion, and a concave portion for engaging with the convex portion is formed on a hole of the hook holding portion into which the shaft portion is inserted. An electric tool characterized by being performed.

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